Nalco Chemical Company

Nalco Company

Robert W Novak

William J Ward

Ross Gray

Krzysztof Andruszkiewicz

Timothy Patrick McGinnis

Thomas C Fallon

Ross T Gray

A method of sizing paper for use in applications which require resistance to liquids comprising incorporating in the paper a size composition comprising one or more alkenyl succinic anhydride (ASA) compounds prepared from the reaction of maleic anhydride and one or more substantially symmetrical C-Cinternal olefins.

Use of alkenyl succinic anhydride compounds derived from symmetrical olefins in internal sizing for paper production

The invention provides a method for improving the retention of mineral fillers and cellulose fibers on a cellulosic fiber sheet. The method comprising the steps of preparing a cellulose pulp slurry; adding before a shearing step an effective amount of a copolymer flocculant to the cellulose pulp slurry, the copolymer flocculant is a high molecular weight cationic copolymer of acrylamide and diallyl dimethyl ammonium chloride, the flocculant copolymer should contain from about 20 to about 60 mole percent diallyl dimethyl ammonium chloride mer units. After a shearing step adding an effective amount of a high molecular weight water-soluble anionic flocculant. A cellulosic fiber sheet is then formed from the cellulose pulp slurry which includes both the copolymer flocculant and anionic flocculant.

Papermaking process with improved drainage and retention

Emulsion of alkenyl succinic anhydride sizing agents are prepared using a cationic water-soluble polymer and a cationic starch as an emulsifier.

Emulsification of alkenyl succinic anhydride sizing agents

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Lisle, IL, United States of America

Robert W Novak