Photocurable organopolysiloxane compositions and their cured products

Abstract

An organopolysiloxane composition is provided that has curability suitable for photoforming and storage stability sufficient to ensure workability. A photocurable organopolysiloxane composition comprises: (A) the following (Ai) and / or (A-ii): (Ai) a linear organopolysiloxane having alkenyl groups bonded to silicon atoms at both ends; (A-ii) an organopolysiloxane resin having [SiO4 / 2] units; (B) an organopolysiloxane without [SiO4 / 2] units; (C) an organohydrogenated polysiloxane having two or more hydrogen silyl groups in one molecule; (D) a photoactive hydrogenation reaction catalyst; (E) a polyether and / or a polyether derivative; and (F) silicon dioxide with a BET specific surface area of ​​50-400 m² / g and a hydrophobic surface treatment.