Patent ID: 6395071
Filing Date: 2002-05-28
Classification: B32B,C08J,C08L,Y10T

Abstract:
A breathing film which contains at least one layer obtained by processing a propylene resin composition comprising crystalline propylene polymer(A) and propylene/&agr;-olefin random copolymer(B) having 45 to 85% by weight of propylene unit based on the weight of copolymer(B); said film having thickness of 10 to 100 &mgr;m and having anti-bacterial agent coated thereon or included therein; in which said composition comprises 10 to 60% by weight of propylene/&agr;-olefin random copolymer(B) based on the total weight of polymer(A) and copolymer(B) and the ratio [&eegr;]B/[&eegr;]A of intrinsic viscosity [&eegr;]B of propylene/&agr;-olefin random copolymer(B) and intrinsic viscosity [&eegr;]A of crystalline propylene polymer(A) being 0.3 to 1.2; and (1)water vapor permeability[TH2O] (according to JIS Z-0208), (2)oxygen gas permeability [TO2&mgr;] (according to JIS K-7126-A, and (3) ethylene gas permeability [Tethylene] (according to JIS K-7126-A) are each in the range described below.(1) [TH2O]=9 to 50 (unit:g/m2Â·24 h) (2) [TO2]=600 to 12500 (unit:nmol/m2Â·sÂ·100 kPa) (3) [Tethylene]=600 to 22500 (unit:nmol/m2Â·sÂ·100 kPa).