| abstract |
Block copolymers of the given structure comprising a propylene homopolymer block A and binary random copolymer blocks B and C of propylene/ethylene are obtained by using a Ziegler type catalyst and ethylene and propylene as the starting materials, and are crosslinked under heating conditions to produce crosslinked products having a given gel percentage. The obtained crosslinked products have, particularly, excellent tensile strength and heat resistance as well as flexibility. |