THERMOSETTING PRESSURE-SENSITIVE ADHESIVE AND ADHESIVE SHEETS MADE BY USING THE SAME

摘要

A thermosetting pressure-sensitive adhesive which essentially consists of a product of photopolymerization of a composition comprising (a) 100 parts by weight of a monomer mixture comprising 70 to 99 wt.% of alkyl (meth)acrylates wherein the alkyl group has on the average 2 to 14 carbon atoms and 30 to 1 wt.% of an ethylenically unsaturated acid copolymerizable therewith, (b) 0.02 to 5 parts by weight of a crosslinking agent comprising a polyfunctional (meth)acrylate, (c) 0.01 to 4 parts by weight of a photopolymerization initiator, and (d) 5 to 30 parts by weight of an epoxy resin and being substantially free from any curing agent for the epoxy resin (d), and which can easily be bonded tentatively to an adherent at ordinary temperatures by virtue of its pressure-sensitive adhesive properties, can be cured by heating in a short time to exhibit high bond strength and heat resistance, and is excellent in storage stability; and adhesive sheets made by using the same.