Patent ID: 6273997
Filing Date: 2001-08-14
Classification: D21H

Abstract:
A method for sizing paper or paperboard, said method consisting essentially of incorporating into the paper or paperboard pulp at a pH of about 5.0 to about 8.5 a sizing composition consisting essentially of (a) about 0.1 to about 1% by weight of rosin, based upon the dry weight of the pulp, (b) about 10 to about 90% of at least one hydrocarbon resin, based upon the total weight of the rosin and hydrocarbon resin, (c) a cationic component consisting essentially of a cationic polyamine resin, wherein the weight ratio of the rosin and hydrocarbon resin to cationic resin is about 5:1 to about 1:2 and the cationic polyamine resin is selected from the group consisting of polyalkyleneamine-epihalohydrin resins, polyalkyleneamine-dicyandiamide-epihalohydrin resins, poly(diallylamine.cndot.HCl)-epihalohydrin resins, poly(methyldiallylamine.cndot.HCl)-epihalohydrin resins, epihalohydrin-modified polyethyleneimine resins, amine-modified poly(methyldiallylamine.cndot.HCl)-epihalohydrin resins, and mixtures thereof, and (d) up to 0.3% alum, based on the dry weight of the pulp.