| 摘要 |
Provided is a silicone composition, including: (A) an organopolysiloxane represented by an average composition formula R<SUP>1</SUP><SUB>n</SUB>SiZ<SUB>[(4-n)/2]</SUB> (in which, R<SUP>1 </SUP>represents a monovalent hydrocarbon group, an alkoxy group or a hydroxyl group, provided that from 5 to 50 mol % of all R<SUP>1 </SUP>groups are alkenyl groups, and from 10 to 80 mol % of all R<SUP>1 </SUP>groups are aryl groups, Z represents an oxygen atom or a bivalent hydrocarbon group, provided at least 80 mol % of all Z groups are oxygen atoms, and n is a number that satisfies 1=n<2), in which from 5 to 50 mol % of all silicon atoms exist within structures represented by an average formula: -SiR<SUP>2</SUP><SUB>2</SUB>-X-(SiR<SUP>2</SUP><SUB>2</SUB>O)<SUB>1</SUB>SiR<SUP>2</SUP><SUB>2</SUB>-X-SiR<SUP>2</SUP><SUB>2</SUB>O- (in which, R<SUP>2 </SUP>represents a monovalent hydrocarbon group, provided that from 10 to 80 mol % of all R<SUP>2 </SUP>groups are aryl groups, X represents an oxygen atom or a bivalent hydrocarbon group, and l represents an integer of 3 or greater), (B) an organohydrogenpolysiloxane having at least 2 SiH groups within each molecule, and (C) an addition reaction catalyst. The composition is capable of producing a cured product with a high degree of hardness and excellent crack resistance. The composition is useful as a sealing material and an adhesive.
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