Patent ID: 7727635

Claim:
A composition comprising: (A) a silicone resin obtained by hydrolysis and condensation of at least one compound selected from the group consisting of alkoxysilanes represented by a general formula (1) shown below and partial hydrolysis-condensation products thereof: (R 1 ) m Si(OR 2 ) 4-m (1) wherein, R 1 represents a hydrogen atom, or a substituted or unsubstituted monovalent hydrocarbon group, R 2 represents an alkyl group of 1 to 3 carbon atoms, and m represents either 0 or 1, or a silicone resin obtained by hydrolysis and condensation of at least one material selected from the group consisting of combinations of an alkoxysilane represented by the above general formula (1) and a dialkoxysilane represented by a general formula (2) shown below: (R 1 ) 2 Si(OR 2 ) 2 (2) wherein, R 1 and R 2 are as defined above, and partial hydrolysis-condensation products of the combinations, (B) hydrophobic silica microparticles, (C) a curing catalyst, and (D) a solvent, wherein the silica microparticles of the component (B) are produced via steps described below: (I) a step of subjecting a tetrafunctional silane compound represented by Si(OR 4 ) 4 , wherein R 4 represents identical or different monovalent hydrocarbon groups of 1 to 6 carbon atoms; or a partial hydrolysis-condensation product thereof; or a mixture thereof; to hydrolysis and condensation within a mixed liquid of a hydrophilic organic solvent and water that comprises a basic substance, thereby forming a silica microparticles dispersion, (II) a step of adding a trifunctional silane compound represented by a general formula (3) shown below: R 5 Si(OR 6 ) 3 (3) wherein, R 5 represents a substituted or unsubstituted hydrocarbon group of 1 to 20 carbon atoms, and R 6 represents identical or different monovalent hydrocarbon groups of 1 to 6 carbon atoms; or a partial hydrolysis-condensation product thereof; or a mixture thereof; to the silica microparticles dispersion, thereby treating a surface of the silica microparticles, introducing R 5 SiO 3/2 units at a surface of the silica microparticles, and yielding a treated silica dispersion, and (III) a step of adding a silazane compound represented by a general formula (4): (R 3 ) 3 SiNHSi(R 3 ) 3 (4) or a monofunctional silane compound represented by a general formula (5): (R 3 ) 3 SiX (5) wherein R 3 represents identical or different, substituted or unsubstituted monovalent hydrocarbon groups of 1 to 20 carbon atoms, and X represents an OH group or a hydrolysable group; or a mixture thereof; to the treated silica dispersion, thereby treating a surface of the silica microparticles, and introducing (R 3 ) 3 SiO 1/2 units at a surface of the silica microparticles.