Betz Laboratories, Inc.

Gilbert S Gomes

David D Dreisbach

Michael A Schuster

The invention is a process for controlling pitch deposition from pulp in papermaking systems, by an effective amount of a polymer having methyl ether groups pendant to the backbone of the polymer to the pulp term 'polymer'. A preferred embodiment of the invention is controlling pitch deposition by adding an effective amount of a water soluble cellulose ether.

Process for controlling pitch deposition from pulp in papermaking systems

The invention relates to a process for controlling pitch deposition from pulp in papermaking systems which comprises adding to the pulp an effective amount of a polymer having hydroxyl groups pendant to the backbone of the polymer. The polymer can be polyvinyl alcohol having 50% to 100% hydrolysis. The polymer can also be a water-soluble copolymer having recurring units of nonionic hydrophilic monomers, and/or hydrophobic monomers, wherein the copolymer has at least 20 mol percent of vinyl alcohol. In another aspect, this invention comprises adding to the pulp an effective amount of a water-soluble polymer derived by substituting hydroxyl groups onto a preformed reactive polymer, wherein the water-soluble polymer has at least 20 mol percent of hydroxyl groups.

A process for controlling pitch deposition from pulp in papermaking systems which comprises adding to the pulp an effective amount of a polymer containing polymerized units of methyl vinyl ether.

The invention relates to a process for controlling pitch deposition from pulp in papermaking systems which comprises adding to the pulp an effective amount of a water-soluble quaternized polyamine ionene polymer.

Pitch control process utilizing quaternized polyamine ionene polymer

The invention relates to a process for controlling pitch deposition from pulp in papermaking systems which comprises adding to the pulp an effective amount of a polymer having methyl ether groups pendant to the backbone of the polymer.

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Jacksonville, FL, United States of America

Gilbert S Gomes