Radiation-curable pressure-sensitive adhesive composition and pressure-sensitive adhesive sheets

摘要

The present invention relates to a pressure-sensitive adhesive curable with active energy beams which is useful as a pressure-sensitive adhesive and a pressure-sensitive adhesive sheet. The present invention has been made for the purpose of finding an active energy beam-curable pressure-sensitive adhesive, which is liquid at ordinary temperature, and has practical crosslinkability and curability in the absence of a photopolymerization initiator even when irradiated with visible or ultraviolet light, and gives a cured coating film which does not suffer from discoloration but is excellent in various pressure-sensitive adhesive performances as well as water resistance and heat resistance. The present invention provides a composition comprising a plurality of compounds which each have two or more maleimide groups and are liquid at ordinary temperature, wherein the plurality of compounds comprise (A) a compound having maleimide groups represented by the following formula (1), and (B) a compound having maleimide groups represented by the following formula (2), and/or a compound having maleimide groups represented by the following formula (3). where in formula (2) R¹ and R² each represent an alkyl group, an aryl group, an arylalkyl group or a halogen atom; and in formula (3), R³ represents a propylene group or butylene group which may be substituted.