To provide a novel propylene-based copolymer having high triad tacticity.
A film comprises a propylene-based copolymer (a) comprising 95-99.5 mol% propylene unit and 0.5-5 mol% ethylene unit, (b) having 96.9% triad tacticity of a propylene unit chain part composed of a head-to-tail bond and measured by 13C-NMR, (c) having 0.5-1.5% proportion of a position irregular unit based on 2,1-insertion of a propylene monomer in the whole insertion of the propylene, and 0.05% proportion of a position irregular unit based on 1,3-insertion of the propylene monomer, measured by 13C-NMR, and (d) having 0.1-12 dl/g intrinsic viscosity measured in decalin at 135C. The film has excellent transparency, rigidity, surface hardness, heat resistance, heat-sealability, blocking resistance, bleeding out resistance and impact resistance.
MIZUNO AKIRA
KAWASAKI MASAAKI
IMUDA JUNICHI
KISO YOSHIHISA
HASHIMOTO MIKIO
| JPH01266116A | 1989-10-24 |
Koji Makimura