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US 4,070,414 AGranted
Toughened mercaptosiloxane modified bulk polymerized vinylic polymers
AssigneeDow Corning Corporation
InventorsJames R. Falender, John C. Saam
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Abstract
Improvement in impact strength of certain vinylic polymers is obtained by dissolving a mercaptosiloxane-dimethylsiloxane copolymer in a vinylic monomer and converting the monomer to a polymer by bulk or suspension polymerization in the presence of a free radical generator. For example, a copolymer of mercaptopropylmethylsiloxane and dimethylsiloxane is dissolved in styrene and the styrene is copolymerized with acrylonitrile in bulk and/or in water suspension using benzoyl peroxide as a catalyst.
Claims20
A composition of matter consisting essentially of a matrix of
- 1. a thermoplastic vinylic polymer having dispersed therein
- 2.
Dependencies are inferred from the claim text.