Building a bridge body and building a bridge foaming body null of random

摘要

PURPOSE:To obtain the subject copolymer having specific composition, crystallinity, melt index and elastic modulus and high heat-resistance, solvent resistance and crosslinking efficiency and giving a crosslinked product having excellent tensile properties and abrasion properties by copolymerizing an alpha-olefin with a specific non-conjugated diene, etc. CONSTITUTION:The objective random copolymer having a non-conjugated diene content of 0.1-15mol%, a crystallinity of =20% (by X-ray diffraction), a melt- index of 0.01-200g/10min and an elastic modulus of 1,000-30,000kg/cm2 (measured in conformity to JIS K7203) can be produced by copolymerizing (A) at least one kind of 3-12C alpha-olefin (e.g. propylene), (B) at least one kind of non- conjugated diene of formula (R1 is 1-8C alkyl; R2 to R5 are H or 1-8C alkyl; (n) is 2-10) (e.g. 7-methyl-1,6-octadiene) and, as necessary, (C) ethylene in the presence of (D) a catalyst comprising triethylaluminum, etc.