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:
Mar. 06, 2012
Filed:
Oct. 19, 2007
Masanori Takanashi, Tokyo, JP;
Hideki Kobayashi, Tokyo, JP;
Masanori Takanashi, Tokyo, JP;
Hideki Kobayashi, Tokyo, JP;
Momentive Performance Materials Japan LLC, Tokyo, JP;
Abstract
Provided is a curable polyorganosiloxane composition which advantageously forms a cured product suitable for LED or optical lens, wherein the cured product has excellent light transmission properties in a short wavelength region, i.e., in the blue to ultraviolet region and is unlikely to suffer yellowing due to exposure to heat. A curable polyorganosiloxane composition comprising: (A) alkenyl group-containing polyorganosiloxane which comprises (A1) branched polyorganosiloxane comprising an SiOunit and an RSiOunit, and optionally an RSiO unit and/or an RSiOunit (wherein each R independently represents an unsubstituted or substituted monovalent hydrocarbon group), wherein at least three R per molecule are alkenyl groups, and optionally (A2) linear polyorganosiloxane having R bonded to a silicon atom (wherein R is as defined above), wherein at least two R per molecule are alkenyl groups, wherein 90 mol % or more of the R present in components (A1) and (A2), excluding alkenyl groups, are methyl groups; (B) polyalkylhydrogensiloxane comprising an SiOunit and an R(CH)SiOunit (wherein each Rindependently represents a hydrogen atom or a methyl group), wherein at least three Rper molecule are hydrogen atoms; and (C) a platinum group metal compound.