Rubber composition containing reclaimed silicone rubber

U.S. Patent Number: 5350804

Abstract: A novel method is proposed for the effective utilization of scraps of cured silicone rubbers, of which no method of disposal is known heretofore other than discarding as a waste material. Namely, scraps of cured silicone rubbers can be compounded in a considerably large amount with a vulcanizable composition based on an organic rubbery elastomer such as fluorocarbon rubbers, e.g., binary copolymers of hexafluoropropylene and vinylidene fluoride, and dispersed therein in such fineness that particles of the cured silicone rubber can no longer be recognized by the naked eyes only when the organic rubbery elastomer composition has a specific Mooney viscosity (ML.sub.1+4 100.degree. C.) of at least 70 to give a uniform curable rubber composition capable of being cured into vulcanized rubber articles having various properties as good as or comparable with those of the vulcanized rubber articles from the same organic rubbery elastomer without admixture of cured silicone rubber scraps.

Inventors: Takita; Ken-ichi (Gunma, JP), Takahashi; Masaharu (Gunma, JP)

Assignee: Shin-Etsu Chemical Co., Ltd. (Tokyo, JP)

Application Number: 08/099,498

Issued: 1994-09-27

Expired: 2006-09-27

Classes: 525/104 ; 525/105

Field of search: 525/104,105

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