Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1989-12-06
1991-04-30
Teskin, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525123, 525236, 525237, 525314, 5253325, 5253329, 525374, 526340, C08L 906, C08L 5302
Patent
active
050118889
ABSTRACT:
A rubber composition is disclosed which contains not less than 20% by weight in a rubber component of a block copolymer composed of polymer or copolymer block units (A) and a random copolymer block units (B). The polymer or copolymer block units (A) are obtained by singly polymerizing a conjugated diolefine or copolymerizing the conjugated diolefine and a monovinyl aromatic hydrocarbon with use of a lithium initiator and contains not more than 10% by weight of the bound monovinyl aromatic hydrocarbon. The random copolymer block unit (B) are obtained by copolymerizing the conjugated diolefine and the monovinyl aromatic hydrocarbon and contain 15 to 80% by weight of the bound monovinyl aromatic hydrocarbon. In the block copolymer, (i) the block copolymer contains not less than 10% by weight of each of the block units (A) and the block units (B); (ii) the total content of the bound monovinyl aromatic hydrocarbon is from 10 to 40% by weight; (iii) the average content of the vinyl bonds in the conjugated diolefine portions is from 20 to 70%; and (iv) polymerizable terminals of the block copolymer are reacted with an isocyanate compound.
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Fujimaki Tatsuo
Hamada Tatsuro
Morikawa Akihiko
Ohashi Masayuki
Oshima Noboru
Bridgestone Corp.
Japan Synthetic Rubber Co.
Teskin Fred
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