| abstract |
The present invention relates to a curable silicone composition, wherein the curable silicone composition comprises (A) a linear organopolysiloxane having at least two alkenyl groups in one molecule; (B) an organopolysiloxane represented by the following average unit formula: (R 1 SiO 3/2 ) a (R 1 2 SiO 2/2 ) b (R 1 3 SiO 1/2 ) c (SiO 4/2 ) d (XO 1/2 ) e Wherein each R 1 is independently an alkyl group having 1 to 12 carbons, an alkenyl group having 2 to 12 carbons, an aryl group having 6 to 20 carbons, an aralkyl group having 7 to 20 carbons Or a group in which some or all of the hydrogen atoms of these groups are substituted with a halogen atom, provided that at least two R 1 s in one molecule are alkenyl groups, X is a hydrogen atom or an alkyl group, B is 0 or a positive number, c is a positive number, d is a positive number, e is a number from 0 to 0.4, a + b + c + d = 1, and c / d is a number from 0 to 10 And b / d is a number from 0 to 0.5; (C) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in one molecule; (D) a cerium-containing organopolysiloxane; And (E) a hydrosilylation reaction catalyst. The curable silicone composition can form a cured product that does not cause cracking due to thermal aging and has little yellowing. |