Patent ID: 8308902
Filing Date: 2012-11-13
Classification: D21H

Abstract:
1. A method of improving retention and drainage in a papermaking process comprising: adding to a papermaking slurry, an associative polymer and an about 50% hydrolyzed poly(vinylamine) in a ratio of between 1:1 to 1:2.5 by mass, wherein the associative polymer comprises the formula (1): wherein B is a nonionic polymer segment comprising one or more ethylenically unsaturated nonionic monomers; F is polymer segment comprising at least one ethylenically unsaturated anionic or cationic monomer, and the molar percent ratio of B:F is 95:5 to 5:95, and wherein the associative polymer has associative properties provided by an effective amount of at least one emulsification surfactant chosen from diblock or triblock polymeric surfactants and wherein the amount of the at least one diblock or triblock surfactant to monomer is at least about 3:100, wherein non-ionic monomer comprises acrylamide, and the anionic monomer comprises a free acid of acrylic acid or salt of acrylic acid.