POLYPROPYLENE COMPOSITION

PROBLEM TO BE SOLVED: To provide a polypropylene composition excellent in flexibility, impact resistance, heat resistance and low temperature heat-sealing properties. SOLUTION: The polypropylene composition comprises a specific amount ratio of [A] polypropylene and [B] which is specified [B-1] or [B-2], wherein [B-1] is a 1-butene-based elastomer and has (1) 5-50 wt.% 1-butene unit content, (2) ≥90% triad tacticity, (3) 0.1-12 dl/g intrinsic viscosity, (4) ≤3 molecular weight distribution and (5) 1.0-1.5 B value and [B-2] is a propylene-ethylene-based elastomer and has (1) 50-95 mol% propylene unit content, (2) ≥90% triad tacticity, and (3) ≥0.05% position irregular unit of polypropylene based on 2, 1-insertion and (4) 0.1-12 dl/g intrinsic viscosity. COPYRIGHT: (C)2005,JPO&NCIPI