Microporous film and process for production thereof

Details Microporous film and process for production thereof Microporous film and process for production thereof

1987-06-12

1988-12-13

Anderson, Philip

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

Synthetic resins

Cellular products or processes of preparing a cellular...

21050036, 264 41, 264 49, 2642888, 2642896, 429254, 521 91, 521134, 521143, B29C 6720, B29C 5502, C08F 1000, C08J 926

Patent

active

047911441

ABSTRACT:
Disclosed is a microporous polyproplene film comprising a propylene homopolymer, a copolymer of propylene with other copolymerizable monomer or a blend thereof, which has an intrinsic viscosity (.eta.) of 1.9 to 3.0 dl/g, especially 2.0 to 3.0 dl/g, as measured at 135.degree. C. in tetralin, said microporous film having a network structure comprising intercommunicating pores having a maximum pore size smaller than 1.mu. and an average pore size of 0.005 to 0.6.mu. and having a porosity of 30 to 90%, an air permeability of 5 to 500 sec/100 cc and a thickness of 5 to 200.mu., said microporous film being molecularly oriented by stretching.

REFERENCES:
patent: 4613643 (1986-09-01), Nakamura et al.

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