Nalco Chemical Company

Thomas Aitken

David J Kowalski

K G Srinivasan

Peter D Buikema

Wilfred D Pote

This invention concerns a new class of compositions for the sizing of paper and the method of treating paper using such compositions. Such new compositions comprise the reaction products of glyoxal and a hydrophobe which contains at least one hydroxyl group. Such compositions can be used either for internal or surface sizing.

Alkoxylated dioxolanes as paper sizing agents

Paper and other cellulose materials are sized with a cationic starch prepared by forming an aqueous slurry of a lightly oxidized starch, adding a cationizing agent to the slurry and then heating the slurry in a continuous cooker.

Making a lightly oxidized starch additive by adding a cationic polymer

An improved method for cationizing starch which comprises reacting an aqueous slurry of starch under alkaline conditions with a water-soluble quaternary ammonium polymer in the presence of a small amount of a metal-free oxidizing agent.

Cationization of starch utilizing alkali metal hydroxide, cationic

A cationic additive for starch which comprises a preferred condensate of epichlorohydrin with an equimolar quantity with dimethylamine, and in which a minor amount of up to 30 percent molar ammonia may be substituted for a like molar amount of dimethylamine. This condensate is preferably intimately admixed and utilized in an amount of 1-7 percent (preferred 5-7 percent) with alkaline gelatinized or alkali hydrolyzed starch to give a liquid cationic treating agent for paper. The percentage of condensate additive is calculated using as a base granular or dry starch and the condensate is preferably added to the liquid gelatinous starch after the gelatinization or in situ during the gelatinization. The starch, during the addition of the condensate, is maintained alkaline by a preferred alkali metal hydroxide of about 5 percent strength. This cationic starch may be used as a wet end pulp additive in the range 3-50 lbs/ton and has shown to favorably affect burst strength and pigment retention values.

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Chicago, IL, United States of America

Thomas Aitken