Patent ID: 6172149
Filing Date: 2001-01-09
Classification: C08F,C08L,D21H

Abstract:
A rosin-fatty acid vinylic polymer surface sizing composition prepared by the process of:(A) reacting in an addition polymerization reaction:(1) about 20.0% to about 60.0% by total weight of the reactants of a fatty acid rosin mixture comprising:(a) about 10.0% to about 90.0% by total weight of the mixture of fatty acid, and(b) about 10.0% to about 90.0% by total weight of the mixture of rosin; and(2) about 40.0% to about 80.0% by total weight of the reactants of a monomer mixture comprising:(a) about 15.0% to about 45.0% by total weight of the mixture of a member selected from the group consisting of acrylic acid, methacrylic acid, fumaric acid, maleic anhydride, and combinations thereof,(b) about 55.0% to about 85.0% by total weight of the mixture of a member selected from the group consisting of vinylic monomers and combinations thereof,(c) about 0.5% to about 5.0% by total weight of the mixture of a polymerization initiator,(d) up to about 4.0% by total weight of the mixture of a chain transfer agent, and(e) up to about 30% by total weight of the mixture of a hydrocarbon solvent, at a temperature in the range of about 135.degree. C. to about 175.degree. C. to produce a rosin-fatty vinylic polymer having a weight average molecular weight in the range of about 4,000 to about 12,000; and(B) dispersing the rosin-fatty vinylic polymer in water; to produce the surface sizing composition.