Silicon rubber composition having excellent durability in repeated mold release

U.S. Patent Number: 5342913

Abstract: An addition-curable type rubber composition comprising a vinyl-containing organopolysiloxane as a base polymer and, particularly, further comprising as a crosslinking agent an organohydrogenpolysiloxane which contains, in its molecule, at least one unit having the following formula: ##STR1## wherein J is an alkylene group of from 2 to 4 carbon atoms, Rf is a perfluoropolyether group, and a is an integer of from 0 to 2. The composition has excellent durability in repeated mold release, and a mold prepared from the composition is able to produce moldings of constant quality even when molding is repeated a large number of times.

Inventors: Takago; Toshio (Annaka, JP), Inomata; Hiroshi (Annaka, JP), Sato; Shinichi (Annaka, JP), Kinami; Hitoshi (Annaka, JP)

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

Application Number: 08/092,807

Issued: 1994-08-30

Expired: 2006-08-30

Classes: 528/15 ; 528/42

Field of search: 528/15,42

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