Aqueous cationic polyurethane emulsion with glycidyl ether curing agent

Claim 1

A curable cationic polyurethane emulsion capable of forming a film possessing excellent physical properties, which comprises a mixture of a cationic polyurethane resin aqueous emulsion and from 2 to 50 parts by weight, per 100 parts by weight of the polyurethane resin, of an epoxide group-containing compound selected from the group consisting of diglycidyl ethers of diol selected from ethylene glycol, propylene glycol, polyoxyethylene glycol, polyoxypropylene gycol, neopentyl glycol and bisphenol A, polyglycidyl ethers of polyol selected from glycerin, trimethylol propane, pentaerythritol, diglycerol and sorbitol, and allyl glycidyl ether and oligomers thereof, said cationic polyurethane resin emulsion having been prepared by either (1) reacting an isocyanate-terminated urethane prepolymer (A) with an excess amount of a polyalkylene polyamine to form a polyurethane urea polyamine (B), and either (a) mixing said polyurethane urea polyamine (B) with an aqueous solution of an acid, (b) reacting said polyurethane urea polyamine (B) with an epihalohyrin and mixing the resulting reaction product with an aqueous solution of an acid, or (c) partially reacting free amino groups of said polyurethane urea polyamine (B) with a blocked polyisocyanate having one free isocyanate group, which blocked polyisocyanate has been obtained by reacting a polyisocyanate with an isocyanate-blocking agent, and mixing the resulting reaction with an aqueous solution of an acid, or (2) reacting said urethane prepolymer (A) with a polyalkylene polyamine derivative having at least two primary or secondary amino groups and at least one functional group having the formula --CH 2 --CH(OH)--CH 2 X, in which X is Cl, or BR, and mixing the resulting reaction product with an aqueous solution of an acid.