BUTEN-1-COPOLYMER.

摘要

The present invention provides a butene-1 copolymer which comprises 60 to 98.5 mol % of butene-1 unit, 0.5 to 20 mol % of ethylene unit and 0.5 to 20 mol % of another alpha -olefin unit(s), said butene-1 copolymer having an intrinsic viscosity of 0.9 to 7.2 dl/g measured in a decalin solution heated to 135 DEG C, a density of 0.840 to 0.920 g/cm<3>, a weight-average molecular weight/number-average molecular weight ratio of 2 to 15, a maximum melting point of 50 to 120 DEG C measured by a differential scanning calorimeter, a soluble matter content of the butene-1 copolymer in boiling diethyl ether of 3 to 50 wt % and a crystallinity of 5 to 60 % measured by X-ray diffractometry, and containing one or less neighboring bond of the ethylene unit and the other alpha -olefin unit(s) per 1,000 carbon atoms measured by NMR, which copolymer has excellent mechanical properties such as a high tensile strength, high impact strength and etc., good working characteristics, small change of shrinkage after molding, moderate flexibility, and good low-temperature impact properties such as retention of a high impact strength at a low temperature, and is used as various materials for, for example, films, wire sheaths or pipes.