Patent ID: 9481785
Filing Date: 2016-11-01
CPC Classification: C08F,C08L,C09D,D21H

Claim Text:
1. A sizing agent comprising a finely divided, cationic or amphoteric, aqueous polymer dispersion obtained by emulsion polymerizing an ethylenically unsaturated monomer in the presence of a cationic or amphoteric protective colloid, wherein first the cationic or amphoteric protective colloid is prepared by polymerizing a monomer blend in the presence of at least one first polymerization initiator in an organic solvent in a pressurized reactor at a pressure of at least 1720 kPa and at a temperature of between 170° C. and 220° C., and wherein the monomer blend comprises an ethylenically unsaturated monomer comprising an amine group, to obtain a resin, then combining the resin with an acid and water to obtain the cationic or amphoteric protective colloid, thereafter performing an emulsion polymerization by introducing a monomer mixture into an aqueous medium comprising the cationic or amphoteric protective colloid and a second polymerization initiator, wherein the monomer mixture comprises an ethylenically unsaturated water insoluble monomer.