| abstract |
PROBLEM TO BE SOLVED: To provide an aqueous adhesive which is excellent in viscosity stability, initial adhesive property and water-resistant adhesive property and also excellent in safety. SOLUTION: Copolymerization of polyvinyl alcohol polymer (A) having a vinyl alcohol unit of 90 mol% or more and a polymerization degree of 300 to 4000, and acrylic acid and an acetal group-containing ethylenically unsaturated monomer. A polyacrylic acid copolymer (B) containing 5 to 40 mol% of a unit derived from the acetal group-containing ethylenically unsaturated monomer, obtained by the above, is an aqueous adhesive in which the aqueous medium (C) is dissolved. And (A) component is 5 to 25% by weight with respect to (C), and the weight ratio of component (A) to component (B) (A) :( B) is 99: 1 to 50:50 The agent can solve the above-mentioned problems. [Selection figure] None |