NORBORNENE COMPOUNDS HAVING CHAIN POLYENE GROUPS AND UNSATURATED ETHYLENIC COPOLYMER PRODUCED WITH THE USE OF THE SAME

摘要

A norbornene compound having a chain polyene group represented by general formula (I), wherein n is an integer of 1 to 5; R<1> represents C1-5 alkyl; and R<2> and R<3> represent each independently hydrogen or C1-5 alkyl. The unsaturated ethylenic copolymer of the invention is a random copolymer consisting of 30 to 92 mol % of ethylene units (i), 6 to 70 mol % of specific alpha -olefin units (ii) and 0.1 to 30 mol % of the above norbornene compound units (iii), the molar ratio [(i)/(ii)] being 40/60 to 92/8, the unit (iii) being represented by a specific formula, and the limiting viscosity [ eta ] being 0.05 to 10 dl/g. The novel copolymer is excellent in weatherability, heat resistance and ozone resistance and shows a high vulcanization rate.