Patent ID: 7488789
Filing Date: 2009-02-10
Classification: C08F,C08L,Y10S,Y10T

Abstract:
1. A propykne/1-butene random copolymer (PBR) comprising: (1) 60 to 75 mol % of units derived from propylene and 25 to 40 mol % of units derived from 1-butene, and having (2) a triad isotacticity, as determined from a (3) a molecular weight distribution (Mw/Mn), as determined by gel permeation chromatography (GPC), from 1 to 3, (4) an intrinsic viscosity, as measured in decalin at 135° C., from 0.1 to 12 dl/g, (5) a melting point (Tm), as measured on a differential scanning calorimeter, from 40 to 66.5° C. and a crystallization rate (½ crystallization time) at 45° C. of 10 minutes or less, and satisfying (6) the following relation: wherein Tm represents a melting point and M (mol %) represents a content of 1-butene constituent units.