Patent ID: 8142895

Claim:
A cured aryl polysiloxane composition comprising: A. an alkylene bridged aryl polysiloxane comprising: at least two silicon-bridging alkylene moieties; and from at least 30 mole percent to no more than 99.9 mole percent silicon bonded aryl groups, based on total moles of silicon bonded organic groups of the alkylene bridged aryl polysiloxane; and B. a hydrosilation catalyst, wherein the hydrosilation catalyst is a metal or metal compound comprising a Group VIII element selected from platinum, rhodium, palladium, and combinations thereof; and the hydrosilation catalyst, and any derivatives thereof, is present in a combined amount of at least 0.005 ppm to less than 0.6 ppm, expressed as a Group VIII element equivalent value, based on the weight of the cured aryl polysiloxane composition; and wherein the cured aryl polysiloxane composition does not discolor during 14 days of heat aging at 200° C. in air, as indicated by a CIE b value, determined using CIE 1976 L*a*b* D 65 (illumination angle)/10(observation angle) color test method, of no more than 2.0 measured through a 0.6 millimeter thick specimen of the cured aryl polysiloxane composition after the heat aging.