| 摘要 |
This is to provide an ultraviolet-curable silicone resin composition which is a liquid state, excellent in coating property, and suitable for production of a thin type or large-sized image display device which can suppress occurrence of display failure, without lowering legibility, with high brightness and high contrast. The ultraviolet-curable silicone resin composition comprises (A) a polyorganosiloxane having a mercaptoalkyl group bonded to a silicon atom and a viscosity at 23°C of 20 to 25000 cP; (B) an organopolysiloxane having aliphatic unsaturated groups which comprises (B1) a linear polyorganosiloxane having aliphatic unsaturated groups represented by the formula (I), and (B2) a branched organopolysiloxane which comprises an SiO 4/2 unit, an R' 3 SiO 1/2 unit and an R' 2 SiO 2/2 unit, and optionally further comprises an R'SiO 3/2 unit, wherein each R' independently represents a C1-C6 alkyl group or aliphatic unsaturated group, and at least three of R' per one molecule are aliphatic unsaturated groups, provided that an amount of (B2) is an amount where a number of the aliphatic unsaturated group in (B2) based on a total number of the aliphatic unsaturated groups in (B) is 50% or less; (C) a photoinitiator; and (D) a silane compound having an aliphatic unsaturated group, where, a ratio of a number of the mercaptoalkyl groups present in (A) based on a total number of the aliphatic unsaturated groups in (B) and (D) is 0.5 to 1.05, a ratio of a number of the mercaptoalkyl groups present in (A) based on a number of the aliphatic unsaturated groups in (B) is 0.95 to 3, and a ratio of a number of the mercaptoalkyl groups present in (A) based on a number of the aliphatic unsaturated groups in (D) is 1.5 to 3, and a sealing agent for an image display device comprising the ultraviolet-curable silicone resin composition and an image display device comprising an image display portion and a protective portion being encapsulated by using the sealing agent for an image display device. |
