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:
Nov. 18, 2014
Filed:
Jun. 21, 2011
Yoshihira Hamamoto, Annaka, JP;
Tsutomu Kashiwagi, Annaka, JP;
Yoshihira Hamamoto, Annaka, JP;
Tsutomu Kashiwagi, Annaka, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
One object of the present invention is to provide a silicone resin composition having remarkably low gas permeability which is useful for a purpose requiring lower gas permeability. Further, another object of the present invention is to provide an optical semiconductor device provided with a cured product obtained by curing the silicone resin composition which has discoloration resistance, durable reflection efficiency and high reliability. The present invention provides a silicone resin composition comprising (A) an organopolysiloxane having at least two alkenyl groups per molecule, and is represented by the average compositional formula (1), (B) an organohydrogenpolysiloxane having at least two hydrogen atoms bonded to a silicon atom, and is represented by the average compositional formula (2), (C) a catalytic amount of a curing catalyst, and (D) 0.001 to 3 parts by mass of an antioxidant, relative to a total 100 parts by mass of components (A) and (B). The silicone resin composition contains a mixture of three dimensional organopolysiloxanes and linear organopolysiloxanes having alkenyl groups and requires at least 20 to 80 mass %, based on total of (A) and (B), of cycloalkyl groups.