Patent ID: 6127472
Filing Date: 2000-10-03
Classification: C08K,C08L,Y02T

Abstract:
A rubber composition comprising:1 a diene-based rubber component comprising a styrene-butadiene copolymer which has been previously extended using an extender oil, in an amount from 30 to 100 wt % of the total rubber components, wherein said styrene-butadiene copolymer:(a) has a styrene content from 5 to 45 wt %,(b) has 20 to 80% of a microstructure 1,2-bond of butadiene portion,(c) has a glass transition temperature from -55.degree. C. to -20.degree. C., and(d) has 40 wt % or more of a single styrene bond and 10 wt % or less of long styrene chain which contains 8 or more styrene molecules, among the total styrene bonds,2 an extender oil in an amount from 6 to 55 parts by weight for 100 parts by weight of the total rubber components, of which 20 to 50 parts by weight of the extender oil for 100 parts by weight of styrene-butadiene copolymer is used to previously extend the styrene-butadiene copolymer.