Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
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.
Nagou Satoshi
Nakamura Shunichi
Anderson Philip
Tokuyama Soda Kabushiki Kaisha
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