| 摘要 |
PURPOSE:To remove a defect caused by the low dimensional shrink characteristics of synthetic paper made of a polypropylene resin in the cross direction thereof by enhancing the shrinking ratio of a stretched film by enabling low temp. stretchability, by using a specific polypropylene resin compositon. CONSTITUTION:The titled resin film is a monoaxially stretched one formed of a resin composition prepared by compounding 25-84wt% of a propylene copolymer, 1-30wt% of polybutene-1, 10-40wt% of an olefinic resin with a m.p. of 80-110 deg.C and 5-30wt% of an inorg. fine powder and the dimensional thermal shrinking ratio thereof at 120 deg.C is 30-60% in a stretching direction and 5% or less in a non-stretching direction. The propylene copolymer is selected from a mixture consisting of at least two kinds of an ethylene/propylene random copolymer containing 2-10wt% of an ethylene component, an ethylene/propylene/ butene-1 random copolymer consisting of 0-5wt% of an ethylene component, 8-30% of a butene-1 component and 92-65wt% of a propylene component and a copolymer comprising at least two kinds of ethylene, propylene and butene-1 in specific componential content. |
