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US 5,492,956 AGranted
Low organic chlorine wet strength resin composition and methods of making the same
AssigneeHenkel Corporation
InventorsNancy S. Clungeon, Stephen A. Fischer
Life of this patent
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Abstract
Method of preparing a wet-strength resin of the polyamine-epichlorohydrin type in which the E/N ratio is from about 1.0 to about 1.20 and the reaction temperature is no higher than 50.degree. C., and wet-strength resins having high wet-strength and low amounts of chlorinated compounds produced by said method.
Claims3
A process for making a polyamine-epichlorohydrin resin comprising:
- (a) providing a water-polyol-polyalkyleneamine solution wherein said polyol is an aliphatic compound having two or more hydroxyl functionalities that is miscible with water;
- (b) adding to said solution epichlorohydrin at a rate sufficient to maintain the reaction temperature of the reaction mixture in a range of from about 5.degree. to about 15.degree. C. during the addition of said epichlorohydrin to said water-polyol-polyalkyleneamine solution to form a reaction mixture having an E/N ratio of from about 1.0 to 1.20 and wherein the reactants are present in a concentration of about 10 to about 70 wt %;
- (c) maintaining the temperature of said reaction mixture in a range of from about 40.degree. C. up to 45.degree. C. after the addition of said epichlorohydrin;
- and
- (d) adjusting the pH of said reaction mixture to less than about 7 with an aqueous acid solution.
2 more elements
Dependencies are inferred from the claim text.