Nalco Chemical Company

Michael D Breslin

David R Cosper

Roy I Kaplan

Dominic S Rende

James A Hyde

Cationically charged water soluble vinyl addition polymers and condensation polymers provide improved emulsification of alkenyl succinic anhydride sizing agents. Sized paper products prepared from alkenyl succinic anhydride emulsions made with the polymers have superior ink holdout.

Paper sizing method and emulsion

The present invention provdes an additive for reducing brightness loss upon pulp refining comprising in combination at least one anionic polymeric compound and at least one inorganic polymer, preferably such combinations wherein any of such anionic polymeric compounds are of low molecular weight. The preferred inorganic polyphosphates of such combination are those having average polymerization numbers of from about 10 to about 45. The weight proportion of inorganic polyphos-hate to anionic polymeric compound in such combination can be within the range of about 1:10::10:1. The present invention also provides pulp refining processes wherein such additive is added at a sufficient amount to the pulp material being refined to reduce brightness loss, such as at dosages of from about 0.0025 to about 0.5 weight percent additive actives to dry pulp, and end product pulps produced by such processes.

Pulp refining process and additive therefor

Improved pulp strength and brightness of chemically produced pulp can be obtained by treating the pulp with the addition of 0.05-0.5% based on the weight of the dry fiber of certain amine materials in the hypochlorite bleaching stage.

Use of additives in pulp bleaching processes to preserve pulp strength

Improved pulp strength and brightness of chemically produced pulp can be obtained by treating the pulp with the addition of 0.05-0.5% based on the weight of the dry fiber of certain aromatic materials in the hypochlorite bleaching stage.

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Downers Grove, IL, United States of America

Michael D Breslin