The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 16, 1998
Filed:
Sep. 11, 1996
Hironao Fujiki, Gunma-ken, JP;
Kouichi Tanaka, Gunma-ken, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
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.