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
1996-09-11
1998-06-16
Dean, Karen A.
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...
524493, 524588, 524862, 524863, C08K 300
Patent
active
057671931
ABSTRACT:
Provided are a non-foaming curable silicone elastomer composition and a method of preparing such a composition: with the composition comprising (A) 100 parts by weight of an organopolysiloxane mixture constituted at least of 90-10 parts by weight of organopolysiloxanes (i) containing, in a molecule, at least two alkenyl groups and substantially no silicon-attached hydroxyl group and having their kinematic viscosity in the range of 100 to 100,000 centistokes (cSt) at 25.degree. C. and 10-90 parts by weight of organopolysiloxanes (ii) containing, in a molecule, at least one hydroxyl group attached directly to a silicon atom and at least one alkenyl group attached directly to a silicon atom and having their kinematic viscosity in the range of 100 to 100,000 cSt at 25.degree. C.; (B) organohydrogenpolysiloxanes having in each molecule at least 3 hydrogen atoms attached directly to silicon atoms in an amount that the organohydrogenpolysiloxanes afford 0.4-10.0 moles of silicon-attached hydrogen atoms to 1 mole of alkenyl groups supplied from the organopolysiloxane mixture (A); (C) a platinum group metal catalyst; and (D) 10-60 parts by weight of finely powdered silica having a specific surface area of at least 50 m.sup.2 /g, measured by BET method.
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Fujiki Hironao
Tanaka Kouichi
Dean Karen A.
Shin-Etsu Chemical Co. , Ltd.
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