Patent ID: 8932433
Filing Date: 2015-01-13
Classification: D21H

Abstract:
1. A method of improving retention and drainage in a papermaking process comprising: adding to a papermaking slurry, a water soluble anionic associative polymer and a poly(vinylamine) in a ratio of from 2:1 to 1:10 by mass, wherein the associative polymer comprises the formula: wherein B is a nonionic polymer segment comprising one or more ethylenically unsaturated nonionic monomers; F is an polymer segment comprising at least one ethylenically unsaturated anionic 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 comprising a triblock polymeric surfactants, and wherein the amount of the at least one triblock surfactant to monomer is at least about 3:100, wherein the poly(vinylamine) is from 30 to 100% hydrolyzed and wherein non-ionic monomer comprises acrylamide and the anionic monomer comprises a free acid or salt of acrylic acid.