Heat-activatable, pressure-sensitive adhesive tape or sheet

A heat-activable, pressure-sensitive adhesive tape or sheet which comprises a backing material having thereon a layer of heat-activable, pressure-sensitive adhesive having an apparent modulus of elasticity of about 10 to about 300 kg/cm.sup.2 at normal temperature, said adhesive comprising a mixture of

• (a) 100 parts by weight of a copolymer of (i) an alkyl acrylate ester or an alkyl methacrylate ester and (ii) a polymerizable monomer having a functional group selected from the class consisting of a carboxyl group, a hydroxyl group, a glycidyl group, or a methylol group, and
• (b) about 50 to 200 parts by weight of a reactive hot-melt resin that is miscible with said copolymer (a), has a melting point of about 60.degree. C. or higher, and has at least one functional group reactive with the functional group of said copolymer (a), either directly or through a cross-linking agent, and selected from the class consisting of an epoxy resin, a xylene resin containing a methylol group, a rosin resin, a phenolic novolac or resole resin, a rosin-modified phenolic resin, a terpene-modified phenolic resin or a maleic anhydride-modified petroleum resin.