ELASTOMER COPOLYMERS, MANUFACTURE AND USE

Japanese Patent JPS608310

A

The invention relates to elastomeric copolymers of an aromatic vinyl compound and a conjugated diene, suitable for use in the tread portion of a pneumatic tyre, which copolymers have a vinyl content of at least 30% by weight and comprise at least two polymer chains coupled to one another having a differential content of the aromatic vinyl compound at the ends of the copolymer which changes in a portion of not more than 5% of each polymer chain from a first value to a second value which is at least 25 percentage points higher than the first value, and said portion lies within the free terminal 10% portion of the copolymer chain (as determined by monomer conversion); their preparation and their use in tread portions of tyres. The process of the invention is characterized by employing as structure modifier a compound of formulawherein R' and R² are the same or different C_2-18 alkyl groups, and on completion of polymerisation, polymer chains are coupled by means of a coupling agent. The copolymers are characterized by containing a region extending over at least 50% of the polymer chain (as determined by monomer conversion) wherein the differential content of the aromatic vinyl compound in the polymer chain is at least 5% by weight less than the average content of the aromatic vinyl compound in the copolymer.

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ANTONIYUSU AUGUSUTEINUSU BUREE

JP11924984A

January 17, 1985

June 12, 1984

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SHELL INT RESEARCH

B60C1/00; C08F2/38; C08F2/00; C08F4/48; C08F236/00; C08F236/04; C08F236/10; (IPC1-7): C08F236/10; C08F2/00

Kazuho Kawarada

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