PROPYLENE COPOLYMER.

摘要

A substantially syndiotactic propylene copolymer comprising propylene and at least one C6 to C25 cyclic diolefin or C6 to C25 alkadiene having at least one terminal double bond, wherein the peak intensity observed at about 20.2 ppm in the <13>C-NMR spectrum measured in solution in 1,2,4-trichlorobenzene with tetramethylsilane as the internal reference is at least 0.5 of all the peak intensities assignable to the propylene methyl group, the content of the cyclic diolefin or alkadiene is 0.01 to 20 mole %, and the limiting viscosity [ eta ] as measured at 135 DEG C in tetralin is 0.1 to 10 dl/g. This copolymer may further contain an alpha -olefin other than propylene, particularly ethylene.