Patent ID: 7858709

Claim:
An aqueous dispersion adhesive composition comprising: an aqueous dispersion copolymer obtained by reacting of a reaction component comprising alkyl (meth)acrylate whose linear or branched alkyl group has 4 to 18 carbon atoms, (meth)acrylic acid, a phosphoric acid group-containing vinyl monomer and an alkoxysilyl group-containing vinyl monomer; and a crosslinking agent having reactivity with a carboxyl group, wherein an amount of the crosslinking agent is from 0.07 to 4 parts by weight per 100 parts by weight of the aqueous dispersion copolymer, and an elongation at 90° C. based on the following test of an adhesive layer made of the aqueous dispersion adhesive composition is 200% or less, wherein the test comprises subjecting the aqueous dispersion adhesive composition to heating to prepare an adhesive layer, and the adhesive layer thus prepared is formed into a cylindrical column shape having a cross section of 4.6 mm 2 and a length of 30 mm to prepare a test piece, subsequently, the test piece is allowed to stand at 90° C. for 1 hour, and thereafter, an initial length L 0 of the test piece is measured, then, the test piece with one end fixed and the other end attached a 12 g-weight, is hung down vertically at 90° C. for 2 hours, and a length L 1 (mm) of the test piece after the 2-hour hanging is measured, and the elongation is calculated by the following equation: Elongation (%)=( L 1 −L 0 )/ L 0 ×100.