C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 53/00 (2006.01) C08J 5/18 (2006.01) C08L 23/16 (2006.01) C08L 31/04 (2006.01)
Patent
CA 2329606
Provided is a porous film which is excellent in a water vapor transmission rate, a tear strength and a weatherability. This porous film can be produced by melt-extruding, for example, by a T-die method, a composition comprising 100 parts by weight of a resin blend (1) comprising 100 parts by weight of 1 an ethylene-pro- pylene copolymer, 3 to 40 parts by weight of 2 a low density polyeth- ylene and 3 to 40 parts by weight of 3 an ethylene-vinyl acetate copolymer and 100 to 200 parts by weight of calcium carbonate (2), or a composition comprising 100 parts by weight of the above resin blend (1), 100 to 200 parts by weight of calcium carbonate (2), 0.5 to 20 parts by weight of titanium dioxide (3) coated on a surface thereof with silica and/or alumina, 0.2 to 10 parts by weight of a hindered amine light stabilizer (4) having a molecular weight of 1500 to 4500 and 0.03 to 3 parts by weight of an ethyl estar phosphorus acid or biphenylene phosphonites antioxidant. (5), receiving the extruded matter at a draft ratio of 2 to 30 and a non-stretched film-forming speed of 20 m/minute or more, cooling it by an air chamber method or an air knife method and then stretching it in a monoaxial or biaxial direction by at least 1.3 time in terms of an area magnification.
Osaki Daisuke
Takahashi Yoshinori
Smart & Biggar
Tokuyama Corporation
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