Patent ID: 8637627

Claim:
A curable phenoxyphenyl polysiloxane composition comprising: A. a branched multialkenyl phenoxyphenyl polysiloxane represented by average compositional formula II, (R 6 3 SiO 1/2 ) c (R 7 2 SiO 2/2 ) d (R 8 SiO 3/2 ) e (SiO 4/2 ) f (II), wherein: R 6 3 SiO 1/2 , R 7 2 SiO 2/2 , R 8 SiO 3/2 , and SiO 4/2 are, respectively, an M-unit, a D-unit, a T-unit, and a Q-unit, all of which are primary siloxane units; each of R 6 , each of R 7 , and each of R 8 is, independently, a silicon bonded organic group selected from alkenyl, phenoxyphenyl, aryl other than phenoxyphenyl, alkyl, hydroxy, alkoxy, aryloxy, other organic radical, hydrogen, and combinations thereof; at least two silicon bonded organic groups are alkenyl; the alkenyl group is CH2=CH-Xs- wherein s=0 or 1, and X is independently selected from: linear, branched or cyclic saturated C 1 -C 16 hydrocarbon radical, o-phenyl, m-phenyl, p-phenyl, and combinations thereof; the alkenyl group is present in an amount of 1 mole percent to no more than 20 mole percent, based on total moles of the silicon bonded organic group of the multialkylene phenoxyphenyl polysiloxane; at least one silicon bonded organic group is a phenoxyphenyl group selected from o-phenoxyphenyl, m-phenoxyphenyl, p-phenoxyphenyl, and combinations thereof; the silicon bonded phenoxyphenyl group is present in an amount of greater than 0 mole percent and no more than 99 mole percent, based on the total moles of silicon bonded organic groups in the alkenyl phenoxyphenyl polysiloxane; subscripts c, d, e, and f are selected to conform with the mole fractions of R 6 3 SiO 1/2 , R 7 2 SiO 2/2 , R 8 SiO 3/2 , and SiO 4/2 , respectively; 0.001≦c≦1; 0≦d≦0.999; 0≦e≦0.20; 0≦f≦0.10; c+d+e+f=1; and e+f>0; and the multialkenyl phenoxyphenyl polysiloxane has: i) a number average molecular weight of at least 500 grams/mole and no more than 5,000 grams/mole; and ii) a viscosity of at least 10 and no more than 7,000,000 centipoise at 25° C.; B. a multihydrido silicon compound having at least two silicon bonded hydrogen atoms; C. a hydrosilation catalyst in an amount effective to catalyze hydrosilation; and D. a reactive diluent.