Cyclic dihydrogenpolysiloxanes, hydrogenpolysiloxanes, processes for their production, silica type glass moldings and a process for their production, optical elements and a process for their production

摘要

The present invention, cyclic dihydrogen polysiloxane, certain siloxane units of the formula, such as hydrogen polysiloxane, singer decomposition / condensation method using the method for their preparation, cyclic siloxanes or by the art-dihydro-hydrogen polysiloxane in the art to cure the mold in vacuum -UV area to 90% to 100% of light transmission in the UV and visible region to near infrared region Method for producing a silica-based glass formed article having a light transmittance of 98% to 100% in the area, the art silica-based glass formed body, silica-based glass produced by the optical element, the optical element covering a hydrogen polysiloxane and this silica by curing it relates to a method and an optical element having such a silica type glass film layer for producing an optical element having a glass-based film layer.