Patent ID: 7156944

Claim:
A low-creep radiation-crosslinkable hotmelt pressure-sensitive adhesive composition comprising: (A) 0 to 40% by weight of at least one natural or synthetic, non-radiation-crosslinkable elastomer as component (A); (B) 15 to 40% by weight of at least one radiation-crosslinkable compound containing at least two olefinic double bonds selected from the group consisting of component (B1), component (B2) and component (B3), wherein (B1) component (B1) is at least one diolefin homopolymer and/or copolymer having olefinic double bonds along the main chain and having a percentage content of recurring diolefin units being 50 to 100% by weight selected from the group consisting of homo- or copolymers of ,1,3-pentadiene, 2-ethyl-1 3-butadiene, 2-propyl-1,3-butadiene, 2-isopropyl-1,3-butadiene, 2-hexyl-1,3-butadiene, 2,3-dimethyl-1,3-butadiene, 2,3-diethyl-1,3-butadiene, 2-methyl-1,3-pentadiene, 2-methyl-1,3-hexadiene, 2-methyl-1,3-octadiene, 2-methyl-1,3-decadiene, 2,3-dimethyl-1,3-pentadiene, 2,3-dimethyl-1,3-hexadiene, 2,3-dimethyl-1,3-octadiene, 2,3-dimethyl-1,3-decadiene, 2-methyl-1,3-cyclopentadiene, 2-methyl-1,3-cyclohectadiene, 2,3-dimethyl-1,3-cyclopentadiene, 2,3-dimethyl-1,3-cyclohexadiene, 2-chloro-1,3-butadiene, 2,3-dichloro-1,3-butadiene, 1-fluoro-1,3-butadiene, 2-chloro-1,3-pentadiene, 2-chloro-1,3-cyclopentadiene and 2-chloro-1,3-cyclohexadiene; (B2) component (B2) is at least one compound having olefinic double bonds in the side chains and having a percentage content of recurring diolefin units of 50 to 100% by weight and a percentage content of vinylic double bonds of from 5 to 100%, based on the total number of olefinic double bonds in component (B2), selected from the group consisting of i) homopolymers and/or alternating copolymers and/or statistical gradient copolymers of 1,3-butadiene, 2-methyl-1,3-butadiene (isoprene), 1,3-pentadiene and/or cyclopentadiene; and ii) homo- and/or copolymers of monomers selected from the group consisting of 1,3-butadiene, 2-methyl-1,3-butadiene, 1,3-pentadiene and/or cyclopentadiene which contain at least one functional group selected from the group consisting of hydroxyl groups, amino groups, epoxide groups, isocyanate groups, carboxyl groups, carboxylic anhydride groups, mercapto groups, silane groups and hydrosilyl groups; (B3) component (B3) is at least one acrylate or methacrylate ester with a (meth)acrqlate functionality of at least two selected from the group consisting of acrylate and methacrylate esters of aromatic polyols, aliphatic polyols, cycloaliphatic polyols, and polyether alcohols; and (C) 20 to 85% by weight of at least one tackifying resin as component (C); wherein said adhesive composition is solid at 20 degrees C and does not contain any sulfur-group-containing crosslinker.