Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1995-05-10
1996-09-03
Dean, Ralph H.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
575926, C04L 5300
Patent
active
055524834
ABSTRACT:
Block copolymers are described which comprise alternating blocks of (A) a polysiloxane; and (B) a copolymer of a 1,3-conjugated diene and a monovinyl aromatic compound. The block copolymers can be prepared by reacting a polysiloxane with a dilithiated copolymer of a conjugated diene and a monovinyl aromatic compound and thereafter neutralizing the reaction product with a protonic acid or a polyfunctional alkyl silane or silicon tetrachloride. Cured elastomer compositions exhibiting surface release characteristics are obtained by curing a mixture comprising the above-described block copolymer in the presence of a curing system comprising a peroxide and sulfur. Multilayer elastomer structures useful in manufacturing articles from elastomeric materials also are described wherein at least a portion of an outer layer of the multilayer elastomer structure has release characteristics and comprises the cured block copolymers of the present invention.
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Graves Daniel F.
Hergenrother William L.
Bridgestone Corporation
Dean Ralph H.
Hall Daniel N.
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