04-04-2013 дата публикации
Номер: US20130083528A1
A water-proof and dust-proof membrane assembly which has a satisfactory water-proof property, dust-proof property, sound transmission capability and air permeability, as well as excellent supporting intensity and pressure resistance is provided. A water-proof and dust-proof membrane assembly having a body and a supporting member, in which the body is an asymmetric porous structure in the form of membrane having a first surface and a second surface, the supporting member is composed of a polymeric material, includes a first contact surface and a second contact surface and the porosity (second porosity) of the supporting member is larger than the first porosity, i.e. 10% to 99.9%, and the first surface of the body and the first contact surface of the supporting body are bonded is provided. 1. A water-proof and dust-proof membrane assembly having a body and a supporting member ,wherein the body is an asymmetric porous structure in the form of membrane having a first surface and a second surface,{'sup': 4', '3', '2', '4', '3', '2, 'sub': 2', '2, 'the asymmetric porous structure has a thickness of 1 to 1000 μm, a porosity (first porosity) of 5% to 90%, a pore size of each pore is 0.01 μm to 15 μm, a Frazier air permeability of 8.0×10ft/minftto 250×10ft/minft, a Gurley number of 0.3 to 25 seconds, a Water Resistance of 1000 mmHO to 23000 mmHO and a Sound Transmission Loss 0.5 dB to 2.0 dB,'}the supporting member is composed of a polymeric material, includes a first contact surface and a second contact surface and a porosity (second porosity) of the supporting member is larger than the first porosity, i.e. 10% to 99.9%, andthe first surface of the body and the first contact surface of the supporting body are bonded.2. The water-proof and dust-proof membrane assembly of the claim 1 , wherein the asymmetric porous structure has a skin layer and a continuously foamed porous layer and the skin layer makes up 0.04 to 40% of the thickness of the asymmetric porous structure.3. ...
Подробнее