AQUEOUS DISPERSION OF COPOLYMER FOR ADHESIVE

摘要

PURPOSE:To reduce the lowering in adhesion of an aq. dispersion with time, by copolymerizing an ethylenically unsatd. dicarboxylic acid (monoester) with a (meth)acrylic ester and an ethylenically unsatd. monomer copolymerizable with them to prepare an aq. dispersion. CONSTITUTION:0.5-5wt% at least one monomer (A) selected from among ethylenically unsatd. dicarboxylic acids and their monoesters is copolymerized with 55-99.5wt% (meth)acrylic ester (B) having a 2-18C alkyl group and 0-40wt% other ethylenically unsatd. monomer copolymerizable with the components (A) and (B) to obtain an aq. dispersion of a copolymer having a glass transition temp. of -20--100 deg.C. It is required that the aq. dispersion contain a water-soluble component (as determined according to a specifically defined method) in an amount of 3wt% or less based on the total solid matter. The amount of the water-soluble component exceeding 3wt% brings about a remarkable change with time under wet heat conditions of adhesive products prepared therefore, which renders the products unsuitable for use as an adhesive.