Patent ID: 7705093

Claim:
A curable silicone resin composition which is a solid or a semisolid at room temperature, comprising: (A) a resin-structure organopolysiloxane consisting essentially of (A-1) at least 90 mol % of a total of R 1 SiO 1.5 siloxane units, R 2 2 SiO siloxane units, and R 3 a R 4 b SiO (4-a-b)/2 siloxane units wherein, R 1 , R 2 and R 3 each represent, independently, a methyl group, ethyl group, propyl group, cyclohexyl group or phenyl group, R 4 represents a vinyl group or allyl group, a represents 0, 1 or 2, b represents 1 or 2, a+b is either 2 or 3, and (A-2) 0 to 10 mol % of at least one silanol-containing siloxane unit, said component (A-1) consisting of 90 to 24 mol % of R 1 SiO 1.5 siloxane units, 75 to 9 mol % of R 2 2 SiO siloxane units, and 50 to 1 mol % of R 3 a R 4 b SiO (4-a-b)/2 siloxane units, said component (A-1) having a structure in which at least a part of said R 2 2 SiO units are repeated, and a number of repetitions of said R 2 2 SiO units is within a range from 5 to 300, and said resin-structure organopolysiloxane in a solid or semisolid state at room temperature; (B) a resin-structure organohydrogenpolysiloxane consisting essentially of (B-1) at least 90 mol % of a total of R 1 SiO 1.5 siloxane units, R 2 2 SiO siloxane units, and R 3 c H d SiO (4-c-d)/2 siloxane units wherein, R 1 , R 2 and R 3 are as defined above, c represents 0, 1 or 2, d represents 1 or 2, c+d is either 2 or 3, and (B-2) 0 to 10 mol % of at least one silanol-containing siloxane unit, said component (B-1) having a structure in which at least a part of said R 2 2 SiO units are repeated, and a number of repetitions of said R 2 2 SiO units is within a range from 5 to 300, and having a polystyrene eguivalent weight average molecular weight determined by GPC within a range from 3,000 to 1,000,000, said organohydrogenpolysiloxane present in sufficient quantity that a molar ratio of hydrogen atoms bonded to silicon atoms within component (B), relative to vinyl groups or allyl groups within component (A), is within a range from 0.1 to 4.0; (C) an effective quantity of at least one platinum group metal-comprising catalyst; and (D) at least one phosphor.