Patent ID: 8338527

Claim:
A curable silicone composition comprising: (A) an organopolysiloxane that is represented by the average unit formula: (R 1 3 SiO 1/2 ) a (R 2 2 SiO 2/2 ) b (R 3 SiO 3/2 ) c wherein R 1 , R 2 , and R 3 are each independently selected from substituted or unsubstituted monovalent hydrocarbon groups and epoxy-functional monovalent organic groups, with the proviso that at least 20 mole % of R 3 are aryl groups, and a, b, and c are numbers that satisfy 0≦a 0.8, 0≦b≦0.8, 0.2≦c≦0.9, and a+b+c=1, and that has at least two of the aforementioned epoxy-functional monovalent organic groups in each molecule; (B) a diorganosiloxane represented by the general formula: A-R 5 —(R 4 2 SiO) m R 4 2 Si—R 5 -A wherein R 4 is substituted or unsubstituted monovalent hydrocarbon group that does not contain an aliphatically unsaturated bond, R 5 is a divalent organic group, A is a siloxane residue with the average unit formula: (XR 4 2 SiO 1/2 ) d (SiO 4/2 ) e wherein R 4 is defined as above; X is a single bond, hydrogen atom, group defined as for the aforementioned R 4 , epoxy-functional monovalent organic group, or alkoxysilylalkyl group, with the proviso that at least one X in each molecule is a single bond and at least two X's in each molecule are epoxy-functional monovalent organic groups; d is a positive number; e is a positive number; and d/e is a positive number from 0.2 to 4, and m is an integer with a value of at least 1; and (C) a curing agent for epoxy resin, wherein component (C) is an organosiloxane with the general formula: R 6 3 SiO(R 6 2 SiO) n SiR 6 3 , wherein R 6 is a substituted or unsubstituted monovalent hydrocarbon group or phenolic hydroxyl-functional monovalent organic group, with the provisos that at least two R 6 groups in each molecule are each a phenolic hydroxyl-functional monovalent organic group and that at least one R 6 group that is present at each terminal of the molecule is a phenolic hydroxyl-functional monovalent organic group, and n is an integer from 0 to 1,000.