Patent ID: 7381470

Claim:
A self-supporting polysiloxane film, which does not have a specific light absorption band in the visible wavelength range and has an optical transmissivity of not less than 85% at 400 nm and an optical transmissivity of not less than 88% in the wavelength range of from 500 nm to 700 nm, said film comprising a polysiloxane crosslinked by reacting, in the presence of a platinum catalyst, a polysiloxane having an unsaturated aliphatic hydrocarbon group and represented by the average structural formula: (1) R 1 a SiO (4-a)/2 (where R 1 is a C 1 ˜C 10 monovalent hydrocarbon group and the subscript >>a<< is a positive number in the range of 0<a<2) and wherein the polysiloxane comprises (R 3 SiO 3/2 ) units (where R 3 is a C 1 ˜C 10 monovalent hydrocarbon group other than a C 2 ˜C 10 monovalent unsaturated aliphatic hydrocarbon group) and/or (SiO 4/2 ) units with an organosilicon compound having at least two hydrogen atoms directly bonded to silicon atoms.