| abstract |
1,261,371. Blends of conjugated diene polymers. INTERNATIONAL SYNTHETIC RUBBER CO. Ltd. 25 March, 1969 [25 March, 1968], No. 14358/68. Heading C3P. A blend comprises a rubbery conjugated diene polymer having less than 30% of its unsaturation in the side chains and a rubbery conjugated diene homopolymer having more than 30% of its unsaturation in the side chains. The blend may be formed by mill mixing or solution mixing and the compositions may also contain oils, polyisobutylene plasticizer and fillers. Suitable polymers are low vinyl polybutadiene, low vinyl SBR and high vinyl polybutadiene. The compositions are used in the manufacture of tyre treads. |