PRODUCTION OF POLYSILOXANE RESIN FOR USE IN NEARULTRAVIOLET REGION

摘要

PROBLEM TO BE SOLVED: To provide a polysiloxane resin having low absorption of light in near-ultraviolet region. SOLUTION: The process for the production of a polysiloxane resin for the use in near-ultraviolet region comprises the reaction and curing of a polysiloxane having SiH group in the molecule with a polysiloxane having vinyl group directly bonded to Si atom in the molecule in the presence of a platinum catalyst. The resin can be cured by setting the amount of the SiH group of the polysiloxane having SiH group to >=1.2 times equivalent based on the vinyl group of the polysiloxane having vinyl group directly bonded to Si atom.