Ultraviolet-curable silicone composition
AssigneeShin-Etsu Chemical Co., Ltd.
InventorShinji IRIFUNE
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Abstract
Provided is an ultraviolet-curable silicone composition including: (A) a non-terminal epoxy group-containing organopolysiloxane, (B) an organopolysiloxane containing epoxy groups at the two terminals of the molecular chain, and an onium salt photoinitiator capable of generating cations upon irradiation with ultraviolet light. The silicone composition of the present invention yields a cured film that exhibits excellent ultraviolet-curability and can be readily peeled from a pressure-sensitively adhesive material. In particular, the silicone composition yields a cured film that exhibits a tight release force relative to pressure-sensitive adhesives such as acrylic-based pressure-sensitive adhesives, and also exhibits minimal fluctuation in the release force.
Claims8
An ultraviolet-curable silicone composition comprising:
- (A) 100 parts by mass of an epoxy group-containing organopolysiloxane represented by a formula (1) shown below,
- (wherein, R represents an unsubstituted or substituted monovalent hydrocarbon group of 1 to 10 carbon atoms, Ep represents an epoxy group-containing substituent group, a and b represent integers that satisfy 45≦a+b≦150, 1≦a and 0≦b, and an average epoxy equivalence is not more than 700 g/mol),
- (B) 1 to 15 parts by mass of a terminal epoxy group-containing organopolysiloxane represented by a formula (2) shown below:
- (wherein, R1 represents an unsubstituted or substituted monovalent hydrocarbon group of 1 to 10 carbon atoms other than an aryl group, Ep represents an epoxy group-containing substituent group, R2 represents an aryl group, and c and d represent positive integers that satisfy 45≦c+d≦350 and 0.05≦c/(2+c+d)≦0.30), and
- an onium salt photoinitiator.
Dependencies are inferred from the claim text.