Sadao Kitagawa

1. A new crystalline copolymer of propylene with methyl-1,4-hexadiene

SummaryA new crystalline thermoplastic copolymer of propylene with methyl-1,4-hexadiene (MHD) was obtained with a conventional Ziegler-Natta catalyst. The copolymerization rate was not much depressed by the MHD monomer. Hydrogen was conveniently utilized to regulate the molecular weight of copolymer. In addition, hydrogen increased the copolymerization rate. The copolymer is characterized by chemical reactivity owing to the pendant unsaturation. Improved adhesion property of the copolymer has been shown, which implies useful applications.