Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1985-08-27
1988-11-01
Briggs, Sr., Wilbert J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 98, 525 99, 525258, 525256, 525914, C08F29704
Patent
active
047821191
ABSTRACT:
A rubber composition containing at least 20% by weight of a styrene-butadiene block copolymer consisting of a block (A) and a block (B) characterized in that: (i) the block (A) is a styrene-butadiene copolymer block having the content of styrene of 10-80% by weight and the average content of the vinyl bonds in the butadiene portion of 30-70% by weight; (ii) the block (B) is a polybutadiene block with the average content of the vinyl bonds in the butadiene portion being not more than 60% by weight (iii) the styrene-butadiene block copolymer contains at least 20% by weight of each of the block (A) and the block (B); (iv) the average content of the vinyl bonds in the butadiene portion of the block (A) is greater by at least 5% by weight than that of the block (B); (v) the glass transition temperature of the block (A) is higher by at least 30.degree. C. than that of the block (B); (vi) the whole content of the bound styrene in the above block copolymer is 5-40% by weight; (vii) the ratio Mw/Mn between the weight average molecular weight Mw and the number average molecular weight Mn of the block copolymer is 1.8-5.0 when calculated as polystyrene according to the gel permeation chromatogram; and (viii) the Mooney's viscosity (ML.sub.1+4.sup.100.degree. C.) of the block copolymer is 20-150.
REFERENCES:
patent: 4433109 (1984-02-01), Takeuchi et al.
patent: 4463133 (1984-07-01), Takeuchi et al.
Fujimaki Tatsuo
Iakashima Akio
Morimoto Yoshiyuki
Oshima Noboru
Sakakibara Mitsuhiko
Bridgestone Corporation
Briggs Sr. Wilbert J.
Japan Synthetic Rubber Co. Ltd.
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