Water-resistant adhesive based on a vinyl acetate emulsion polymer containing a nonionic polyurethane

摘要

The present invention relates to an aqueous emulsion polymer which is useful as a woodworking adhesive. The polymer is prepared by reacting vinyl acetate with an N-methylol containing copolymerizable monomer in the presence of polyvinyl alcohol wherein at least 85% of the polyvinyl alcohol is hydrolyzed and a water-dispersible nonionic polyurethane. The polyurethane is prepared by reacting (i) an organic polyisocyanate, (ii) water-soluble polyalkylene glycols containing at least 70 weight percent of ethylene glycol units, and (iii) polyhydric branched alcohols containing at least three hydroxyl groups per molecule.