Butadiene polymer rubber composition

Abstract

Abstract PURPOSE:A rubber composition useful as tire tread, rubber vibration insulator, having low heat generating properties, improved failure characteristics, rolling resistance characteristics, containing a long-chain branched structure linked by a butadienyl-tin bond and a coupling agent except tin in the molecular chain. CONSTITUTION:A rubber composition comprising a butadiene polymer containing >=20wt%, preferably 30-80wt% branched butadiene polymer, wherein the butadiene polymer has 0-40wt% (especially 3-30wt%) bonded aromatic vinyl compound 30-80wt%, preferably 40-70wt% of the branched polymer is bonded by a tin-butadienyl bond, and the remaining 20-70wt%, preferably 30-60wt% of it is linked by a coupling agent containing no tin. A straight-chain butadiene polymer having the desired molecular weight is obtained in a hydrocarbon solvent using an organolithium compound as an initiator, and a tin coupling agent and the coupling agent containing no tin are added to it, to give the above-mentioned butadiene polymer.

Inventors

• 👤 Mitsuhiko Sakakibara
• 👤 満彦 榊原
• 👤 Kaoru Chuko
• 👤 中湖　薫
• 👤 Tadaaki Nishi
• 👤 西　忠昭

Bibliographic Details