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. 19, 2019
Filed:
Feb. 23, 2016
Dow Corning Toray Co., Ltd., Tokyo, JP;
Dow Toray Co., Ltd., Tokyo, JP;
Abstract
A primer composition is provided. The primer composition comprises: (A) an organosiloxane block copolymer represented by the average unit formula: (RSiO)(RSiO), wherein each Rand Ris independently an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 20 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms, 'a' is a number in the range of 0.40 to 0.90, 'b' is a number in the range of 0.10 to 0.60, and “a+b”=1.00, and having 0.5 to 35.0 mol % of silicon atom-bonded hydroxyl groups or silicon atom-bonded alkoxy groups, in which resinous siloxane blocks are connected by linear siloxane blocks; (B) a curing catalyst; and (C) an organic solvent. The primer composition improves the adhesion of silicone-cured products to base materials of optical semiconductor elements, package materials, substrates etc., and can suppress peeling or cracking caused by heat cycles.