Patent ID: 6103065
Filing Date: 2000-08-15
Classification: D21H

Abstract:
A method for improving the retention and drainage of papermaking furnish comprising the steps of:a. adding 0.005% to 0.25% by weight of at least one cationic high charge density polymer of molecular weight 100,000-2,000,000 having a charge density in excess of 4.0 Meq. to said furnish, after the last point of high shear, such that small flocs having a size range of less than 1/4 inch in diameter are formed;b. either concurrently with or subsequent to step a., adding 0% to 0.20% by weight of at least one polymer having a molecular weight greater than 2,000,000 and a charge density of less than 4.0 Meq;c. subsequent to steps a. and b., adding 0.025-2.0% by weight of a hydrated slurry of a swellable bentonite clay.