Dow Toray Co., Ltd.

Dow Silicones Corporation

Hiroaki Yoshida

Shin Yoshida

Ryosuke Yamazaki

Kazutaka Mori

Christopher S McMillan

The present invention provides an optical member comprising a silicone material having excellent antifouling property while having good light transmittance, heat resistance, and strength, and an optical semiconductor device and illumination apparatus having excellent antifouling property. The present invention is an optical member comprising a silicone material containing a fluorinated surface, the proportion of F atoms being from 0.1 to 45 at % and/or the ratio of F atoms relative to C atoms being from 0.01 to 1.00 in the atomic composition percentage according to X-ray photoelectron spectroscopy (XPS) of the fluorinated surface.

Optical member, optical semiconductor device, and illumination apparatus

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 &#x201c;a+b&#x201d;=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.

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Chiba, Japan

Hiroaki Yoshida