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US 5,691,401 AGranted
Curable resin compositions containing silica-coated microparticles of a cured organosiloxane composition
AssigneeDow Corning Toray Silicone Co., Ltd.
InventorsYoshitsugu Morita, Atsushi Sasaki
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Abstract
The present invention provides curable resin compositions containing finely divided particles of a cured organosiloxane material with microparticles of silica bound to the surfaces of the particles. The particle size of the cured organosiloxane material and the particle size and properties of the silica are within specified limits.
Claims6
A curable resin composition comprising
- (I) 100 parts by weight of a curable resin, and
- (II) 0.1 to 200 parts by weight of particles comprising
- (A) particles of a cured organosiloxane composition having an average diameter of 0.1 to 200 micrometers, wherein said particles have immobilized on the surfaces thereof
- (B) amorphous silica microparticles exhibiting a surface silanol group density of at least 2 per 100 square angstroms, an average particle diameter not exceeding 1 micrometer, and a BET specific surface area of at least 50 m.sup.2 /g.
1 more element
Dependencies are inferred from the claim text.