01-06-2017 дата публикации
Номер: US20170152359A1
Принадлежит:
Microporous sheet product and methods of making and using the same. In one embodiment, the microporous sheet product is made by a process that includes melt-extruding a sheet material using an extrusion mixture that includes a thermoplastic polymer, a non-cross-linked elastomer having a molecular weight of at least 50,000 Da, and a compatibilizing agent. By way of example, the thermoplastic polymer may be a polyolefin, the non-cross-linked elastomer may be a polyisobutylene, and the compatibilizing agent may be mineral spirits. After extrusion, the sheet material may be cooled, and the sheet material may be stretched. The microporous sheet product may be used, for example, as a battery separator, as a food packaging material, as a diffusion barrier in the ultrafiltration of colloidal matter, and in disposable garments. 1. A microporous sheet product made by a method comprising (a) melt-extruding an extrusion mixture to form a sheet material , the extrusion mixture comprising (i) a thermoplastic polymer , (ii) a non-cross-linked elastomer , the non-cross-linked elastomer having a molecular weight of at least 50 ,000 Da , and (iii) a compatibilizing agent , the compatibilizing agent promoting mixing of the thermoplastic polymer and the non-cross-linked elastomer; and (b) then , cooling the sheet material , whereby micropores are formed in the sheet material , wherein the microporous sheet product has a resistivity below 300 ohm-cm as tested in a 30% KOH solution.2. The microporous sheet product as claimed in wherein the thermoplastic polymer comprises one or more thermoplastic polymers selected from the group consisting of polyolefins claim 1 , polyamides claim 1 , polyethylene terephthalate claim 1 , polyacrylics claim 1 , and polyvinyl acetate.3. The microporous sheet product as claimed in wherein the thermoplastic polymer comprises one or more thermoplastic polymers selected from the group consisting of polyolefins and polyamides.4. The microporous sheet product as ...
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