High temperature oleophobic materials

The present invention is directed to gas permeable, oleophobic materials. Preferred materials of the present invention maintain oleophobicity when used in high temperature applications. Most preferable are gas permeable, oleophobic materials that resist penetration by water, and which maintaining these properties upon long-term, high temperature exposure.

Aerogel/PTFE composite insulating material

A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding of filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.

Functional Porous Substrates For Attaching Biomolecules

A substrate comprising a microporous microstructure, an interlayer over at least a portion of the microstructure and a functional layer attached to the interlayer, the functional layer having functional sites with a density of at least 50 nanomoles/cm2.

Vibro acoustic cover using expanded PTFE composite

An acoustically reactive composite can include an expanded polytetrafluoroethylene (ePTFE) membrane formed of a highly fibrillated ePTFE microstructure with an elastomer fully impregnated within the ePTFE membrane. The composite can have an acoustic loss of less than 7 dB at 1 kHz and a water entry pressure (WEP) of at least 20 PSI. A layered assembly for protecting an acoustic device can include an acoustically reactive composite as described above and an adhesive layer arranged to define an acoustic cavity. An acoustic device can incorporate an acoustically reactive composite or layered assembly as described above, with the acoustically reactive composite or layered assembly arranged to span an acoustic cavity proximate to a transducer of the acoustic device.

Aerogel/PTFE composite insulating material

A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding of filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.

Aerogel/PTFE composite insulating material

A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding of filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.

Porous Air Permeable Polytetrafluoroethylene Composites with Improved Mechanical and Thermal Properties

Porous air permeable expanded PTFE composite with enhanced mechanical and thermal properties are described. The node and fibril microstructure of expanded PTFE is coated on and within the node and fibril microstructure with a suitably chosen polymer to impart property enhancement while maintaining porosity. The coating polymer content of the composite is maintained between 3 and 25 weight percent of the composite and the areal mass of the composite is less than 75 gm/m. Exemplary enhancement to properties may include, among others, Average Tensile Strength (ATS) (in MPa)×Z strength (in MPa) of 50 MPaor greater, preferably 100 MPaor greater, with air flow less than 500 Gurley seconds. Coating polymers with appropriate temperature resistance provides composites which further exhibit shrinkage of less than 10% at temperatures up to 300° C. with air flow of less than 500 Gurley seconds. 1. An article comprisinga porous, air-permeable composite comprising an ePTFE substrate having an ePTFE microstructure; and{'sup': 2', '2, 'at least one other polymer coating the ePTFE microstructure wherein said composite exhibits Gurley air flow of less than 500 seconds, a mass per area of 75 gm/mor less and a product of average tensile strength (ATS)×Z Strength of at least 100 MPa, and'}the polymer content of the composite is between 3 and 25 weight percent.2. The article of claim 1 , wherein said article has a strength in the z-direction of at least 0.4 MPa.3. The article of claim 1 , wherein said article exhibits Gurley air flow of 100 seconds or less.4. The article of claim 1 , wherein the ePTFE microstructure comprises substantially fibrils.5. The article of claim 1 , wherein the ePTFE microstructure comprises nodes and fibrils.6. The article of claim 1 , wherein the at least one other polymer comprises at least one polymer selected from the group consisting of polyesters claim 1 , polystyrene claim 1 , polyamides claim 1 , polyphthalamide. polyamide-imides claim 1 , ...

Aerogel/PTFE Composite Insulating Material

A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding of filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.

Functional porous substrates for attaching biomolecules

A substrate comprising a microporous microstructure, an interlayer over at least a portion of the microstructure and a functional layer attached to the interlayer, the functional layer having functional sites with a density of at least 50 nanomoles/cm2.

High temperature oleophobic materials

The present invention is directed to gas permeable, oleophobic materials. Preferred materials of the present invention maintain oleophobicity when used in high temperature applications. Most preferable are gas permeable, oleophobic materials that resist penetration by water, and which maintaining these properties upon long-term, high temperature exposure.

Aerogel/PTFE composite insulating material

A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding of filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.

Aerogel/PTFE composite insulating material

A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding of filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.

Thermally Insulative Expanded Polytetrafluoroethylene Article

The present invention is directed to a thermally insulative material comprising PTFE, including an expanded PTFE (ePTFE), having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. In one embodiment, the insulative material of the present invention includes aerogel particles and polytetrafluoroethylene (PTFE). The insulative material may be formed into articles that are hydrophobic, highly breathable, possess high strength, and which may be used in non-static applications such as dynamic flexing and the like. The insulative articles are flexible, stretchable, and bendable. Also, the insulative material has little to no shedding or dusting of fine particles. Aerogel particles having a particle density of less than about 100 kg/mand a thermal conductivity of less than or equal to about 15 mW/m K at atmospheric conditions (about 298.5 K and 101.3 kPa) may be used in the insulative material. 1. An article comprising:{'sup': '2', 'a thermally insulative expanded PTFE (ePTFE) incorporating thermally insulative particles in an amount of at least 25% by weight of the article, said article having a thermal, conductivity of less than or equal to 25 mW/m K at atmospheric conditions and a moisture vapour transmission rate of at least 5000 g/m/24 hours.'}2. The material of claim 1 , wherein ePTFE exhibits an endotherm at about 380° C.3. The material of claim 1 , wherein said ePTFE is monolithic.4. An article comprisinga thermally insulative expanded PTFE (ePTFE) incorporating between 20% and 40% by weight aerogel particles,{'sup': '2', 'said article having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions and a moisture vapour transmission rate of at least 5000 g/m/24 hours.'}5. The material of claim 4 , wherein said aerogel particles are silica aerogels particles.6. An article comprisinga thermally insulative expanded PTFE (ePTFE) incorporating, between 20% and 40% by weight fumed silica particles, and{'sup': '2 ...

ACOUSTIC COMPOSITE INCLUDING A STIFFENING POLYMER, DEVICES, AND ASSEMBLIES INCLUDING THE SAME

A composite that includes an expanded polytetrafluoroethylene (ePTFE) membrane having a porous microstructure. The porous microstructure of the ePTFE membrane is impregnated with a stiffening polymer. An acoustic device assembly that includes the composite and an acoustic device is also described. The composite and the acoustic device assembly can exhibit an insertion loss of less than 7 dB at 1 kHz when measured by the Acoustic Response Measurement (“ARM”) Test.

Functional Porous Substrates For Attaching Biomolecules

A substrate comprising a microporous microstructure, an interlayer over at least a portion of the microstructure and a functional layer attached to the interlayer, the functional layer having functional sites with a density of at least 50 nanomoles/cm2.

Porous air permeable polytetrafluoroethylene composites with improved mechanical and thermal properties

Porous air permeable expanded PTFE composite with enhanced mechanical and thermal properties are described. The node and fibril microstructure of expanded PTFE is coated on and within the node and fibril microstructure with a suitably chosen polymer to impart property enhancement while maintaining porosity. The coating polymer content of the composite is maintained between 3 and 25 weight percent of the composite and the areal mass of the composite is less than 75 gm/m2. Exemplary enhancement to properties may include, among others, Average Tensile Strength (ATS) (in MPa)×Z strength (in MPa) of 50 MPa2 or greater, preferably 100 MPa2 or greater, with air flow less than 500 Gurley seconds. Coating polymers with appropriate temperature resistance provides composites which further exhibit shrinkage of less than 10% at temperatures up to 300° C. with air flow of less than 500 Gurley seconds.

Porous Air Permeable Polytetrafluoroethylene Composites with Improved Mechanical and Thermal Properties

Porous air permeable expanded PTFE composite with enhanced mechanical and thermal properties are described. The node and fibril microstructure of expanded PTFE is coated on and within the node and fibril microstructure with a suitably chosen polymer to impart property enhancement while maintaining porosity. The coating polymer content of the composite is maintained between 3 and 25 weight percent of the composite and the areal mass of the composite is less than 75 gm/m 2 . Exemplary enhancement to properties may include, among others, Average Tensile Strength (ATS) (in MPa)×Z strength (in MPa) of 50 MPa 2 or greater, preferably 100 MPa 2 or greater, with air flow less than 500 Gurley seconds. Coating polymers with appropriate temperature resistance provides composites which further exhibit shrinkage of less than 10% at temperatures up to 300° C. with air flow of less than 500 Gurley seconds.

Functional Porous Substrates for Attaching Biomolecules

An expanded polytetrafluoroethylene substrate comprising a microporous microstructure, an interlayer over at least a portion of the microstructure, the interlayer containing a reactive functionality, and a functional layer attached to the interlayer, the interlayer comprising a sol-gel coating or a polyvinylalcohol. The functional layer of the substrate having functional sites with a density of at least 50 nanomoles/cm 2 .

Aerogel/PTFE composite insulating material

A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding of filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.

Aerogel/PTFE composite insulating material

A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding of filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.

Functional porous substrates for attaching biomolecules

An expanded polytetrafluoroethylene substrate comprising a microporous microstructure, an interlayer over at least a portion of the microstructure, the interlayer containing a reactive functionality, and a functional layer attached to the interlayer, the interlayer comprising a sol-gel or a polyvinylalcohol. The functional layer of the substrate having functional sites with a density of at least 50 nanomoles/cm2.

Thermally Insulative Expanded Polytetrafluoroethylene Articles

Thermally insulative materials and articles are described. In one embodiment, the thermally insulative material comprises a polymer matrix, aerogel particles and expanded microspheres, wherein the aerogel particles are present in an amount of 30% by weight or greater, the polymer matrix is present in an amount of greater than or equal to 20% by weight and the expanded microspheres are present in an amount of 0.5% to 15% by weight, the percentages being based on the total weight of the polymer matrix, the aerogel particles and the expanded microspheres; and wherein the thermal conductivity of the thermally insulative material is less than 40 mW/m K at atmospheric conditions. 1. A thermally insulative material comprising an polymer matrix , aerogel particles and expanded microspheres; wherein the aerogel particles are present in an amount of 30% by weight or greater , the polymer matrix is present in an amount of greater than or equal to 20% by weight and the expanded microspheres are present in an amount of 0.5% to 15% by weight , wherein the percentages by weight are based on the total weight of the polymer matrix , the aerogel particles and the expanded microspheres; and wherein the thermal conductivity of the thermally insulative material is less than 40 mW/m K at atmospheric conditions.2. The thermally insulative material of wherein the polymer matrix is a fluoropolymer claim 1 , a polytetrafluoroethylene claim 1 , an expanded polytetrafluoroethylene claim 1 , an ultrahigh molecular weight polyethylene (UHMWPE) claim 1 , an expanded ultrahigh molecular weight polyethylene claim 1 , a polyolefin claim 1 , an expanded polyolefin claim 1 , a polyurethane or a combination thereof.3. The thermally insulative material of or wherein the polymer matrix is expanded polytetrafluoroethylene and the expanded polytetrafluoroethylene exhibits an endotherm at about 380° C.4. The thermally insulative material of any one of to claim 1 , when tested according to a 3-second ...

Porous air permeable polytetrafluoroethylene composites with improved mechanical and thermal properties

Porous air permeable expanded PTFE composite with enhanced mechanical and thermal properties are described. The node and fibril microstructure of expanded PTFE is coated on and within the node and fibril microstructure with a suitably chosen polymer to impart property enhancement while maintaining porosity. The coating polymer content of the composite is maintained between 3 and 25 weight percent of the composite and the areal mass of the composite is less than 75 gm/m 2 . Exemplary enhancement to properties may include, among others, Average Tensile Strength (ATS) (in MPa)×Z strength (in MPa) of 50 MPa 2 or greater, preferably 100 MPa 2 or greater, with air flow less than 500 Gurley seconds. Coating polymers with appropriate temperature resistance provides composites which further exhibit shrinkage of less than 10% at temperatures up to 300° C. with air flow of less than 500 Gurley seconds.

Porous Air Permeable Polytetrafluoroethylene Composites with Improved Mechanical and Thermal Properties

Porous air permeable expanded PTFE composite with enhanced mechanical and thermal properties are described. The node and fibril microstructure of expanded PTFE is coated on and within the node and fibril microstructure with a suitably chosen polymer to impart property enhancement while maintaining porosity. The coating polymer content of the composite is maintained between 3 and 25 weight percent of the composite. Exemplary enhancement to properties may include, among others, Average Tensile Strength (ATS) (in MPa)×Z strength (in MPa) of 50 MPaor greater with air flow less than 500 Gurley seconds. Coating polymers with appropriate temperature resistance provides composites which further exhibit shrinkage of less than 10% at temperatures up to 300° C. with air flow of less than 500 Gurley seconds. 1. An article comprisinga porous, air-permeable composite comprising an ePTFE substrate having an ePTFE microstructure; and{'sup': '2', 'at least one other polymer coating the ePTFE microstructure wherein said composite exhibits Gurley air flow of less than 500 seconds, and a product of average tensile strength (ATS)×Z Strength of 50 MPaor greater and'}the polymer content of the composite is between 3 and 25 weight percent.2. The article of claim 1 , wherein said article has a strength in the z-direction of at least 0.4 MPa.3. The article of claim 1 , wherein said article exhibits Gurley air flow of 100 seconds or less.4. The article of claim 1 , wherein the ePTFE microstructure comprises substantially fibrils.5. The article of claim 1 , wherein the ePTFE microstructure comprises nodes and fibrils.6. The article of claim 1 , wherein the at least one other polymer comprises at least one polymer selected from the group consisting of polyesters claim 1 , polystyrene claim 1 , polyamides claim 1 , polyphthalamide claim 1 , polyamide-imides claim 1 , polycarbonates claim 1 , polyethersulphones claim 1 , polysulfones claim 1 , polyphenylenesulfides claim 1 , liquid crystalline ...

Aerogel/PTFE Composite Insulating Material

A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding of filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.

Aerogel/PTFE composite insulating material

A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding of filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.

Porous Air Permeable Polytetrafluoroethylene Composites with Improved Mechanical and Thermal Properties

Porous air permeable expanded PTFE composite with enhanced mechanical and thermal properties are described. The node and fibril microstructure of expanded PTFE is coated on and within the node and fibril microstructure with a suitably chosen polymer to impart property enhancement while maintaining porosity. The coating polymer content of the composite is maintained between 3 and 25 weight percent of the composite and the areal mass of the composite is less than 75 gm/m 2 . Exemplary enhancement to properties may include, among others, Average Tensile Strength (ATS) (in MPa)×Z strength (in MPa) of 50 MPa 2 or greater, preferably 100 MPa 2 or greater, with air flow less than 500 Gurley seconds. Coating polymers with appropriate temperature resistance provides composites which further exhibit shrinkage of less than 10% at temperatures up to 300° C. with air flow of less than 500 Gurley seconds.

Aerogel/PTFE composite insulating material

A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding of filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.

Porous air permeable polytetrafluoroethylene composites with improved mechanical and thermal properties

Porous air permeable expanded PTFE composite with enhanced mechanical and thermal properties are described. The node and fibril microstructure of expanded PTFE is coated on and within the node and fibril microstructure with a suitably chosen polymer to impart property enhancement while maintaining porosity. The coating polymer content of the composite is maintained between 3 and 25 weight percent of the composite and the areal mass of the composite is less than 75 gm/m2. Exemplary enhancement to properties may include, among others, Average Tensile Strength (ATS) (in MPa)×Z strength (in MPa) of 50 MPa2 or greater, preferably 100 MPa2 or greater, with air flow less than 500 Gurley seconds. Coating polymers with appropriate temperature resistance provides composites which further exhibit shrinkage of less than 10% at temperatures up to 300° C. with air flow of less than 500 Gurley seconds.

Functional Porous Substrates for Attaching Biomolecules

An expanded polytetrafluoroethylene substrate comprising a microporous microstructure, an interlayer over at least a portion of said microstructure, the interlayer containing a reactive functionality, and a functional layer attached to said interlayer, said interlayer comprising a sol-gel coating or a polyvinylalcohol, said functional layer having functional sites with a density of at least 50 nanomoles/cm. 1. An expanded polytetrafluoroethylene substrate comprising a microporous microstructure , an interlayer over at least a portion of said microstructure , the interlayer containing a reactive functionality , and a functional layer attached to said interlayer ,said interlayer comprising a sol-gel coating or a polyvinylalcohol,{'sup': '2', 'said functional layer having functional sites with a density of at least 50 nanomoles/cm.'}2. The substrate of wherein said functional sites are created by reacting functional chemistries with the functionality of the interlayer.3. The substrate of wherein said functional layer has a functional site density of at least at least 100 nanomoles/cm.4. The substrate of wherein said functional layer has a functional site density of at least 250 nanomoles/cm.5. The substrate of wherein said functional layer has a functional site density of at least 500 nanomoles/cm.6. The substrate of wherein said functional layer has a functional site density of at least 1000 nanomoles/cm.7. The substrate of further comprising a functionalized site density between 2 claim 1 ,500 and 150 claim 1 ,000 nanomoles/cm.8. The substrate of wherein said functional sites are selected from at least one of hydroxyl groups claim 1 , amine groups claim 1 , carboxyl groups claim 1 , aldehyde groups claim 1 , and epoxide groups.9. The substrate of wherein said interlayer comprises polyvinylalcohol.10. The substrate of wherein said interlayer comprises sol-gel coating.11. The substrate of wherein said functional layer comprises organosilane.12. The substrate of wherein ...

Aerogel/PTFE composite insulating material

A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding of filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.

Functional porous substrates for attaching biomolecules

A substrate comprising a microporous microstructure, an interlayer over at least a portion of the microstructure and a functional layer attached to the interlayer, the functional layer having functional sites with a density of at least 50 nanomoles/cm2.

Aerogel/PTFE composite insulating material

A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding of filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.

Functional porous substrates for attaching biomolecules

A substrate comprising a microporous microstructure, an interlayer over at least a portion of the microstructure and a functional layer attached to the interlayer, the functional layer having functional sites with a density of at least 50 nanomoles/cm2.

Aerogel/ptfe composite insulating material

A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding or filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.

Vibro acoustic cover using expanded ptfe composite

An acoustically reactive composite can include an expanded polytetrafluoroethylene (ePTFE) membrane formed of a highly fibrillated ePTFE microstructure with an elastomer fully impregnated within the ePTFE membrane. The composite can have an acoustic loss of less than 7 dB at 1 kHz and a water entry pressure (WEP) of at least 20 PSI. A layered assembly for protecting an acoustic device can include an acoustically reactive composite as described above and an adhesive layer arranged to define an acoustic cavity. An acoustic device can incorporate an acoustically reactive composite or layered assembly as described above, with the acoustically reactive composite or layered assembly arranged to span an acoustic cavity proximate to a transducer of the acoustic device.

Patent IN160579B

Aerogel/PTFE composite insulating material

A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding or filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.

Porous air permeable polytetrafluoroethylene composites with improved mechanical and thermal properties

Porous air permeable expanded PTFE composite with enhanced mechanical and thermal properties are described.. The node and fibril microstructure of expanded PTFE is coated on and within the node and fibril microstructure with a suitably chosen polymer to impart property enhancement while maintaining porosity. The coating polymer content o the composite is maintained between 3 and 25 weight percent of the composite and the areal mass of the composite is less than 75 gm/m 2 . Exemplary enhancement to properties may include, among others, Average Tensile Strength (ATS) (in MPa) x Z strength (in MPa) of 50 MPa 2 or greater, preferably 100 MPa2 or greater, with air flow less than 500 Gurley seconds. Coating poiymers with appropriate temperature resistance provides composites which further exhibit shrinkage of less than 10% at temperatures up to 300°C with air flow of less than 500 Gurley seconds.

Water vapor permeable, air impermeable film and composite coatings and laminates

The water vapor transmission rate (WVTR) of a nonporous polymeric film can be increased by incorporating into it hydrophilic absorbent particles. Compositions are provided for controlled increase in WVTR of a non-porous polymer film or of composites containing it, which can be used in articles of protective clothing and medical dressing with balanced properties of protection and comfort to the user. The material of the invention can be in the form of a waterproof, air permeable, water vapor permeable non-porous polymer film or sheet made of a polymer resin and hydrophilic absorbent particles having absorptive capacity greater than 1 gram of water per gram of dry (water-free) particles. The amount of the particles is such that the WVTR of the film or sheet is higher than that of a comparable film of the polymer resin above. The film or sheet can be substantially planar in nature or can be in the form of a three-dimensional shaped article.

Thermally insulative expanded polytetrafluoroethylene articles

The present invention is directed to a thermally insulative material comprising PTFE, including an expanded PTFE (ePTFE), having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. In one embodiment, the insulative material of the present invention includes aerogel particles and polytetrafluoroethylene (PTFE). The insulative material may be formed into articles that are hydrophobic, highly breathable, possess high strength, and which may be used in non-static applications such as dynamic flexing and the like. The insulative articles are flexible, stretchable, and bendable. Also, the insulative material has little to no shedding or dusting of fine particles. Aerogel particles having a particle density of less than about 100 kg/m3 and a thermal conductivity of less than or equal to about 15mW/m K at atmospheric conditions (about 298.5 K and 101.3 kPa) may be used in the insulative material.

Porous air permeable polytetrafluoroethylene composites with improved mechanical and thermal properties

Porous air permeable expanded PTFE composite with enhanced mechanical and thermal properties are described.. The node and fibril microstructure of expanded PTFE is coated on and within the node and fibril microstructure with a suitably chosen polymer to impart property enhancement while maintaining porosity. The coating polymer content o the composite is maintained between 3 and 25 weight percent of the composite and the areal mass of the composite is less than 75 gm/m2. Exemplary enhancement to properties may include, among others, Average Tensile Strength (ATS) (in MPa) x Z strength (in MPa) of 50 MPa2 or greater, preferably 100 MPa2 or greater, with air flow less than 500 Gurley seconds. Coating poiymers with appropriate temperature resistance provides composites which further exhibit shrinkage of less than 10% at temperatures up to 300°C with air flow of less than 500 Gurley seconds.

Three-dimensional seamless waterproof breathable flexible composite articles

Waterproof, breathable, flexible, seamless shaped articles, such as gloves or socks, which are comprised of a flexible layered composite comprising: (a) a microporous thermoplastic polyester polyurethane or polyether polyurethane that is water vapor permeable, and (b) a hydrophilic nonporous copolymer that is waterproof but water vapor permeable which provides improved waterproofness to the microporous polymer layer.

Wash durable fabric laminates

A delamination problem in fabric laminates made of a fabric laminated to a non-porous, hydrophilic organic polymer film, such as a breathable polyurethane film, was found to be caused by the hydrophilic nature of the polymer. A particular adhesive pattern was devised to overcome the delamination problem. More specifically, a wash-durable fabric laminate of a continuous, non-porous hydrophilic polymer, e.g., a breathable polyurethane, layer and a fabric layer were bonded together by a discontinuous, but interconnected pattern of an adhesive layer. The fabric laminate is water-vapor-permeable, air-impermeable and liquid water impermeable.

Aerogel/PTFE composite insulating material

A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding or filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.

Porous air permeable polytetrafluoroethylene composites with improved mechanical and thermal properties

Porous air permeable expanded PTFE composite with enhanced mechanical and thermal properties are described.. The node and fibril microstructure of expanded PTFE is coated on and within the node and fibril microstructure with a suitably chosen polymer to impart property enhancement while maintaining porosity. The coating polymer content o the composite is maintained between 3 and 25 weight percent of the composite and the areal mass of the composite is less than 75 gm/m2. Exemplary enhancement to properties may include, among others, Average Tensile Strength (ATS) (in MPa) x Z strength (in MPa) of 50 MPa2 or greater, preferably 100 MPa2 or greater, with air flow less than 500 Gurley seconds. Coating poiymers with appropriate temperature resistance provides composites which further exhibit shrinkage of less than 10% at temperatures up to 300°C with air flow of less than 500 Gurley seconds.

Two-way stretchable fabric laminate and articles made from it

The invention is a stretchable layered fabric laminate which is air impermeable and waterproof while being permeable to water vapor. The stretchable fabric laminate includes a stretchable composite material layer consisting of a hydrophobic protective layer of a porous polymeric material on each side of a layer of hydrophilic water-vapor-permeable synthetic polymer. The composite material layer is laminated to at least one layer of stretchable fabric. The stretchable layered fabric laminate has excellent stretch and recovery properties in both machine and transverse directions, and is useful for the manufacture of form-fitting articles of protective clothing and other end uses.