| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat-curable silicone composition giving a cured product having high hardness/transparency and excellent heat-resistance and light resistance, and resistant to clouding even by leaving in a high-temperature and humidity state and returning to room temperature. <P>SOLUTION: The heat-curable silicone composition is composed of (i) an organopolysiloxane expressed by formula (1): R<SP>1</SP><SB>n</SB>(C<SB>6</SB>H<SB>5</SB>)<SB>m</SB>SiO<SB>(4-n-m)/2</SB>(R<SP>1</SP>is a univalent hydrocarbon group, an alkoxy group or hydroxyl group; 1≤n+m<2; and 0.20≤m/(n+m)≤0.95) and having a hydroxyl group content of 0.5-10 mass%, (ii) an organohydrogenpolysiloxane expressed by formula (2): R<SP>2</SP><SB>a</SB>H<SB>b</SB>SiO<SB>(4-a-b)/2</SB>(R<SP>2</SP>is a univalent hydrocarbon group; 0.7≤a≤2.1; 0.01≤b≤1.0; and 0.8≤a+b≤3.0), (iii) a catalyst for addition reaction, and (iv) one or more compounds selected from organohydrogenpolysiloxane having epoxy group and/or alkoxy group, organosilane having epoxy group and/or alkoxy group and non-silicon epoxy compound. <P>COPYRIGHT: (C)2007,JPO&INPIT |
