Highly transparent silicone fluid compound

U.S. Patent Number: 5322891

Abstract: A highly transparent silicone paste composition is formulated by mixing: (a) 100 parts by weight of a long chain alkyl-modified silicone fluid having a viscosity of 50-5,000 cS at 25.degree. C. represented by the formula ##STR1## wherein R.sup.1 is a monovalent saturated straight chain hydrocarbon group having 4-18 carbon atoms and accounts for 10-50 mol % of all the Si substituents; m and n are integers such that 0.ltoreq.m.ltoreq.500, 5.ltoreq.n.ltoreq.500, and 5.ltoreq.m+n.ltoreq.500, and a and b are either 0 or 1; (b) 1-30 weight parts of a fumed silica whose specific surface area is no less than 130 m.sup.2 /g; and (c) 0.1-20 weight parts of an alkoxysilane represented by the formula X.sub.c Si(CH.sub.3).sub.d R.sup.2.sub.e, wherein R.sup.2 is an alkoxy group; X is selected from ##STR2## c is 0 or 1; d is 0, 1 or 2; e is 2 or 3; and c+d+e=4, or a hexamethyldisilazane represented by the formula [(CH.sub.3).sub.3 Si].sub.2 NH.

Inventors: Takahashi; Takayuki (Myogi, JP), Kuwata; Satoshi (Annaka, JP)

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

Application Number: 08/031,020

Issued: 1994-06-21

Expired: 2006-06-21

Classes: 524/847 ; 252/582; 524/588; 524/860; 524/863

Field of search: 524/847,860,863,588 252/21,28,582

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