Adhesive composition comprising (meth) acrylic esters crosslinked by isocyanate adducts

An adhesive composition which is the crosslinked product of components which comprise:

• (A) a copolymer of a (meth)acrylic ester having a weight-average molecular weight of 500,000 to 2,000,000, said weight-average molecular weight being the weight-average molecular weight of a corresponding Polystyrene obtained in accordance with gel permeation chromatography and
• (B) a crosslinking agent comprising an adduct of a polyisocyanate compound which comprises (a) isocyanate difunctional adducts of a diisocyanate compound with a diol and (b) adducts of a diisocyanate compound with a polyhydric alcohol, and having an isocyanate functionality of three or greater, in amounts such that a ratio of the amounts by weight of the difunctional adducts (a) and the adducts (b) is 95:5 to 10:90,
• wherein the copolymer (A) contains portions capable of reacting with the crosslinking agent (B), and wherein said crosslinking agent (B) is in an amount of 0.001 to 50 parts by weight per 100 parts by weight of said copolymer (A), wherein the diisocyanate compound which forms the adducts (a) or the adducts (b) is selected from the group consisting of tolylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate and hydrogenated diphenylmethane diisocyanate;
• the dial which forms adducts (a) is selected from the group consisting of ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, polyethylene glycol, polypropylene glycol and polytetramethylene glycol;
• the polyhydric alcohol which forms the adducts (b) is selected from the group consisting of glycerol, trimethylolpropane, trimethylolethane, pentaerythritol and dimers thereof.