High strength porous film of polypropylene and process for produ

Details High strength porous film of polypropylene and process for produ High strength porous film of polypropylene and process for produ

1997-04-22

1999-10-19

Cooney, Jr., John M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

21050027, 21050036, 21050042, 264 41, 2642103, 2642104, 2642105, 2642107, 264211, 26421113, 2642112, 4283155, 521 64, B29C 4908

Patent

active

059689943

ABSTRACT:
A process for producing a porous film of polypropylene comprises subjecting (1) an air-impermeable biaxially stretched film of polypropylene resin comprised predominantly of polypropylene having a crystallinity of at least 40% or (2) an air-impermeable inflation film of polypropylene resin comprised predominantly of polypropylene having a crystallinity of at least 46.5%, in the substantial absence of a plasticizer or a solvent, to a thermal treatment in the presence of a first liquid substantially incapable of dissolving the film while fixing the film in two orthogonal directions for making the film porous.

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Zhu, et al., "A Novel Polypropylene Microporous Film", Polymers For Advanced Technologies, vol. 7, pp. 743-748 (1996).

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