| 摘要 |
PURPOSE:To provide the title pressure sensitive adhesive layer which is excellent in the stress relaxation properties and the duration of adhesion state, by applying a U.V. ray treatment to an adhesive comprising an acrylic polymer having an epoxy group and a diazonium salt compd. CONSTITUTION:An epoxy group-contg. acrylic polymer (A) having a wt. average MW of 1,000-5,000,000 and pref. an epoxy group content of 1-10% is obtd. by copolymerizing an acrylic acid ester (a) (e.g., 2-ethylhexyl acrylate) with an epoxy group-contg. copolymerizable monomer (b) (e.g., glycidyl methacrylate) in the presence of a radical polymn. initiator. 100pts. component (A) is mixed with (B) 0.5-20pts.wt. diazonium salt compd. of the formula (wherein Ar is an aryl; and X<-> is an anion such as BF4<->, PF4<->, AsF<->, SbF6<->, SbCl6<-> HSO4- and ClO4<->), optionally together with additives (C), such as a tackifier, a softening agent, an antioxidant, a filler, a pigment, etc., thereby obtaining an adhesive. According to necessity, the adhesive is applied to a substrate or applied so as to fill voids, pores, etc., followed by U.V. ray treatment. Thus, there is obtd. the title adhesive layer having both a formed structure and crosslinked structure.
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