Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1993-03-11
1994-06-21
Dean, Ralph H.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524860, 524863, 524588, 252 21, 252 28, 252582, C08K 300
Patent
active
053228910
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.
REFERENCES:
patent: 4064096 (1977-12-01), Gibard
patent: 4101499 (1978-07-01), Herzig
patent: 4116919 (1978-09-01), Elias et al.
patent: 4384068 (1983-05-01), Bouverot et al.
patent: 4404305 (1983-09-01), Gutek
patent: 4701272 (1987-10-01), Mori et al.
Kuwata Satoshi
Takahashi Takayuki
Dean Karen A.
Dean Ralph H.
Shin-Etsu Chemical Co. , Ltd.
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