TAPERED AROMATIC-VINYL/CONJUGATED-DIENE COPOLYMER RUBBER, PROCESS FOR PRODUCING THE SAME, AND RUBBER COMPOSITION

WIPO Patent Application WO/2001/010919

A1

A tapered aromatic-vinyl-monomer/conjugated-diene-monomer copolymer rubber in which the ratio of the content by weight of aromatic vinyl monomer units in the polymer molecules having a molecular weight which is 60 % of Mp, W¿0.6Mp?, to that of aromatic vinyl monomer units in the polymer molecules having a molecular weight of Mp, W¿Mp?, is from 0.65 to 0.9 or from 1.1 to 1.3 provided that Mp is the molecular weight corresponding to the peak of a molecular weight distribution curve obtained by gel permeation chromatography, or a coupling type rubber obtained by linking polymer molecules of the copolymer rubber to one another at terminals thereof; and a rubber composition comprising either the copolymer rubber or the coupling type rubber and either natural rubber or a synthetic isoprene rubber. This rubber composition is reduced in heat build-up and excellent in resistance to wet skidding, strength properties, and wearing resistance.

WO/2000/004066	METHOD FOR POLYMERIZING CONJUGATED DIOLEFINS (DIENES) WITH RARE EARTH CATALYSTS IN THE PRESENCE OF VINYLAROMATIC SOLVENTS
JP2858953	[Title of the Invention] UV-absorbing benzotriazole having a styrene group
JP2518005	[Title of Invention] Method for Producing Conjugated Diene Polymer

KARATO TAKESHI (JP)

PCT/JP2000/005333

February 15, 2001

August 09, 2000

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ZEON CORP (JP)
KARATO TAKESHI (JP)

C08F236/10; C08F297/04; C08L9/06; C08L53/02; (IPC1-7): C08F236/10; C08F297/04; C08L9/06

JPS61291610A	1986-12-22
JPH01167346A	1989-07-03

See also references of EP 1236747A4

Uchida, Yukio (Sunny Port Shiba 1005 5-10 Shiba 2-chome Minato-ku, Tokyo, JP)

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