Patent ID: 8637603

Claim:
A polysiloxane resin composition, comprising: (A) a polysiloxane component including: a first polysiloxane having an average compositional formula of R 4 a (OR 5 ) b (OH) c SiO (4-a-b-c)/2 , wherein R 4 is a monovalent group having 1 to 20 carbon atoms, R 5 is hydrogen or a monovalent group having 1 to 4 carbon atoms, and a, b, and c satisfy the following equations: 0.8≦a≦1.5, 0≦b≦0.3, 0.001≦c≦0.5, and 0.801≦a+b+c<2; and a cyclic polysiloxane represented by the formula (I) wherein, in formula (I), R 1 and R 2 are independently hydrogen, C 1 to C 4 alkyl group, benzyl group, halogen atom, hydroxyl group, C 1 to C 4 alkoxy group or —X—Si(OR 3 ) 3 , X being C 1 -C 4 alkylene, R 3 being C 1 -C 4 alkyl; and n is an integer ranging from 3 to 6, with the proviso that, at least one of the R 1 and R 2 among all repeating units in formula (I) is —X—Si(OR 3 ) 3 , and that R 1 and R 2 cannot be —X—Si(OR 3 ) 3 at the same time in any of the repeating units in formula (I); (B) a white pigment; (C) an inorganic filler; and (D) a catalyst.