Manufacture of paper using copolymers of 2-acrylamido-...

Details Manufacture of paper using copolymers of 2-acrylamido-... Manufacture of paper using copolymers of 2-acrylamido-...

D - Textiles, Paper

21

H

9/59

D21H 11/08 (2006.01) D21H 17/37 (2006.01) D21H 21/10 (2006.01)

Patent

CA 1216711

MANUFACTURE OF PAPER USING COPOLYMERS OF 2-ACRYLAMIDO-2-METHYLPROPANE SULFONIC ACID FOR INCREASING RATE OF DEWATERING OF HIGH MECHANICAL/THERMOMECHANICAL PULP FURNISHES Abstract of the Disclosure A process for increasing rate of dewatering in the manufacture of paper from a furnish whose pulp constitu- ent comprises at least 40% by weight of mechanical wood pulp, thermomechanical wood pulp, or mixtures thereof, by addition thereto of air aluminum salt, e.g., alum, and a water-soluble copolymer containing from about 2 to about 30 mole percent repeating units derived from 2-acrylamido-2- methylpropane sulfonic acid, from 0 to about 25 mole percent repeating units derived from acrylic acid, and from about 45 to about 98 mole percent repeating units derived from acrylamide, while maintaining pH of the furnish in the range of from about 3.5 to about 6.5.

456437

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