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:
Jul. 13, 1982
Filed:
Sep. 23, 1980
Yoshio Okamura, Annaka, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
The invention provides a novel heat curable organopolysiloxane composition capable of giving a cured product having a remarkably high hardness and excellent anti-crack resistance. The cured product is also free from surface tackiness even by heat-curing in air. The main component of the composition is an organopolysiloxane having vinyl groups, phenyl groups and silicon-bonded hydrogen atoms simultaneously in a molecule or a mixture thereof with a second organopolysiloxane having vinyl groups and phenyl groups but no silicon-bonded hydrogen atoms in the molecule. It is essential that the molar ratios of the vinyl groups, phenyl groups, silicon-bonded hydrogen atoms and, if any, alkyl groups in the organopolysiloxane or organopolysiloxanes to the silicon atoms must be within specifically defined ranges and the organopolysiloxane component is admixed with a platinum catalyst for the addition reaction between the vinyl groups and the silicon-bonded hydrogen atoms as well as an organic peroxide such as dicumyl peroxide.