Betz Laboratories, Inc.

Betz Paperchem, Inc.

Hercules Corporation

John C Harrington, Iv

Fu Chen

Michael A Schuster

Wen P Liao

Jen-Chi Chen

Richard Lee Brady

Mary Beth Letscher

Frank J Sutman

Thomas E Taggart

Walter J Burgess

Irenee J Philippe

William Sean Carey

Brian L Walchuk

The present invention is directed to a method for increasing the retention on a washing/thickening device in an aqueous papermaking system. The method generally comprises adding to the furnish solids of the system an effective amount of a cationic polyacrylamide polymer.

Use of polymers in the recycled fiber washing/deinking process

A composition and method for improving the drainage and retention characteristics of a paper furnish consisting of a water soluble graft copolymer and bentonite clay. It is preferred that the graft copolymer be added to the furnish prior to at least one shear stage and that the bentonite clay be added after the shear stage.

Method for improving retention and drainage characteristics in alkaline

A method of improving the drainage characteristics of a pulp slurry in a papermaking operation utilizing the sequential steps of adding alum, ionic polyacrylamide and cationic starch. The cationic starch can be added to the slurry prior to or after the primary screen.

A method for clarifying the laser print deinking loop water in a papermaking process by using a water soluble graft copolymer having the structure: ##STR1## wherein E is the repeat unit obtained after polymerization of an .alpha.,.beta. ethylenically unsaturated compound, the molar percentage of a:b is from about 95:5 to 5:95, with the proviso that the sum of a and b equals 100%; G comprises the structure: ##STR2## wherein d is a cationic monomer, R.sub.1, R.sub.2 and R.sub.3 are the same or different and are hydrogen or a lower alkyl group having C.sub.1 to C.sub.3, F is the salt of an ammonium cation and the molar percentage of c:d is from 95:5 to 5:95 with the proviso that the sum of c and d equals 100%.

Water soluble graft copolymers for laser print deinking loop

The use of quaternized polyvinylamine for use in clarification of water in a deinking loop of a paper, such as newspaper, recycling operation.

Quaternized polyvinylamines for deinking loop clarification

Growing community of inventors

Jacksonville, FL, United States of America

John C Harrington, Iv