| 摘要 |
Provided is a silicone composition, including: (A) an organopolysiloxane represented by an average composition formula R1nSiZ[(4-n)/2] (in which, R1 represents a monovalent hydrocarbon group, an alkoxy group or a hydroxyl group, provided that from 5 to 50 mol % of all R1 groups are alkenyl groups, and from 10 to 80 mol % of all R1 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: -SiR22-X-(SiR22O)1SiR22-X-SiR22O- (in which, R2 represents a monovalent hydrocarbon group, provided that from 10 to 80 mol % of all R2 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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