초록

with the proviso that said coagulant cannot be a cationic dispersion copolymer comprising about 30 mole % diallyldimethylammonium chloride (DADMAC) and about 70 mole % acrylamide (AcAm).

대표청구항 ▼

[ What is claimed is:] [1.]1. In a papermaking process consisting essentially of:forming an aqueous cellulosic papermaking slurry;adding to the slurry certain additives, with said certain additives selected from the group including: coagulants; sizing agents; and mineral fillers;draining the slurry

[ What is claimed is:] [1.]1. In a papermaking process consisting essentially of:forming an aqueous cellulosic papermaking slurry;adding to the slurry certain additives, with said certain additives selected from the group including: coagulants; sizing agents; and mineral fillers;draining the slurry to form a sheet; anddrying the sheet to form a paper sheet;the improvement comprising adding to the slurry, prior to it being drained; from about 0.02 lbs polymer/ton to about 20 lbs polymer/ton of a cationic dispersion polymer; which cationic dispersion polymer is a copolymer comprising about 30 mole % diallyldimethylammoniumchloride (DADMAC) and about 70 mole % acrylamide (AcAm); and dispersion polymer has an RSV of about 5.0 dl/g; andadding to the slurry, either before or after said cationic dispersion polymer is added and the slurry is drained,from about 0.05 lbs microparticle/ton to about 25.0 lbs microparticle/ton of a microparticle selected from the group consisting ofa) copolymers of acrylic acid and acrylamide;b) bentonite; andc) dispersed silica; h the proviso that said coagulant cannot be a cationic dispersion copolymer comprising about 30 mole % diallyldimethylammonium chloride (DADMAC) and about 70 mole % acrylamide (AcAm).