Retention and drainage in the manufacture of paper
View Patent ↗A method of improving retention and drainage in a papermaking process is disclosed. The addition of an associative polymer, a poly(vinylamine) and optionally a siliceous material to the papermaking slurry to improve retention and drainage is disclosed. Additionally a method to improve retention and drainage comprising addition of an organic microparticle, a poly(vinylamine) and optionally a siliceous material to the papermaking slurry is disclosed. A composition comprising an associative polymer, and a poly(vinylamine) and optionally further comprising cellulose fiber is disclosed.
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):
B-co-F (I)
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.
2. The method of claim 1 , wherein the poly(vinylamine) and associative polymer are added to the papermaking slurry as a blend or simultaneously or sequentially.
3. A method of improving retention and drainage in a papermaking process comprising: adding to a papermaking slurry, an associative polymer and a poly(vinylamine) wherein the poly(vinylamine) has been hydrolyzed between about 50% and 100%, wherein the associative polymer and the poly(vinyamine) are added at a ratio of approximately 1:2.5 by mass, and
wherein the associative polymer comprises the formula (1):
B-co-F (I)
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 monomer, and the molar percent ratio of B:F is 65:35 to 35:65, 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.
4. The method of claim 3 , wherein the poly(vinylamine) and associative polymer are added to the papermaking slurry as a blend or simultaneously or sequentially.