Patent ID: 8119744

Claim:
A curable silicone composition comprising at least the following components: 100 parts by mass of (A) an epoxy-containing organopolysiloxane that has a branched molecular structure and comprises: (A 1 ) an organopolysiloxane that contains in one molecule at least two epoxy-containing univalent organic groups and is represented by the following average unit formula: (R 1 3 SiO 1/2 ) a (R 2 2 SiO 2/2 ) b (R 3 SiO 3/2 ) c where, R 1 , R 2 , and R 3 may be the same or different and designate substituted or unsubstituted monovalent hydrocarbon groups or epoxy-containing monovalent hydrocarbon groups; however, at least 20 mole % of the groups designated by R 3 are aryl groups; and where “a”, “b”, and “c” are numbers that satisfy the following conditions: 0≦a≦0.8; 0≦b≦0.8; 0.2≦c≦0.9; a+b+c=1} and/or (A 2 ) a diorganopolysiloxane of the following general formula: A-R 5 —(R 4 2 SiO) m R 4 2 Si—R 5 -A where R 4 is a substituted or unsubstituted monovalent hydrocarbon group which is free of unsaturated aliphatic bonds; R 5 is bivalent organic group; and “A” is a siloxane residual radical represented by the following average unit formula: (XR 4 2 SiO 1/2 ) d (SiO 4/2 ) e where R 4 is the same as defined above, and “X” is a single bond, a hydrogen atom, a group designated by R 4 , an epoxy-containing monovalent organic group, or an alkoxysilylalkyl group; however, at least one group designated by “X” in one molecule is a single bond, at least two groups designated by “X” are epoxy-containing monovalent organic groups; “d” is a positive number; “e” is a positive number; and “d/e” is a number ranging from 0.2 to 4, and where “m” is an integer equal to or greater than 1; 0.1 to 500 parts by mass of (B) a phenolic-type curing agent comprising an organopolysiloxane of the general formula: R 6 3 SiO(R 6 2 SiO) n SiR 6 3 where R 6 is a substituted or unsubstituted monovalent hydrocarbon group or a monovalent organic group that contains a phenolic hydroxyl group; however, in one molecule at least two groups represented by R 6 are monovalent organic groups; and “n” is an integer in the range of 0 to 1000, with the proviso that the organopolysiloxane contains in one molecule at least two phenolic hydroxyl groups; and 0.01 to 100 parts by mass of (C) an acidic-anhydride type curing agent.