To obtain a water-base emulsion compsn. which gives an adhesive having a sufficient water resistance and exhibiting a sufficient adhesive strength even after a long-time immersion in water by compounding a hydrazine compd. into a water-base emulsion which contains a copolymer of an ethylenically unsatd. monomer and a carbonylated vinyl monomer as the disperse phase and a modified polyvinyl alcohol having carbonyl groups at the side chains as the dispersant.
The modified polyvinyl alcohol used as the dispersant is pref. PVA modified by the copolymn. with diacetoneacrylamide. Vinyl acetate is suitable as the raw material for producing the modified polyvinyl alcohol. The degrees of modification, polymn., and saponification of the modified PVA are selected according to the purpose of the use under the conditions that the water solubility is not degraded. The disperse phase is a copolymer obtd. by the emulsion copolymn. of a diacetoneacrylamide of a carbonylated vinyl monomer with allyl acetoacetate, etc., and a monomer selected from among ethylene, propylene, vinyl chloride, alkyl (meth) acrylates, etc. The hydrazine compd. is added to the water-base emulsion pref. in a molar ratio to the carbonyl group in the emulsion of 0.2-5.
NAKAJIMA TAKASHI
NOGUCHI HIROSHI
