| abstract |
Rubber compositions are disclosed which are comprised of a selected rubber made up of ethylene and an α-olefin and/or an unconjugated diene, and specified amounts of one or more cyclopentadiene resins. The resins are derived by copolymerizing (1) component A with component B, component A being either one or both of a conjugated double bond-containing compound and its Diels-Alder adduct and represented by the formula ##STR1## where H is hydrogen, R is C 1-3 alkyl, m and n each are 0-6, and the sum of m and n is 6, and component B being a component having a carbon double bond and a benzene nucleus, (2) component A with component C having a selected polar group and a carbon double bond, (3) a homopolymer of component A with component C, and (4) component A with component D having one or more selected phenols and their alkyl-substituted derivatives. The resulting composition is highly retentive and tacky on roll mills in an unvulcanized state. |