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US 7,407,561 B2Granted
Use of water-soluble crosslinked cationic polymers for controlling deposition of pitch and stickies in papermaking
AssigneeCiba Specialty Chemicals Water Treatments Ltd.
InventorsZhiqiang Song, Philip Anson Ford
Life of this patent
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Abstract
The present invention relates to a method for controlling pitch and stickies deposit in a pulp and papermaking process using crosslinked cationic polymers made by controlled addition of a water soluble radical initiator at reaction temperature with agitation for chain extension and crosslinking.
Claims23
A method of controlling pitch and stickies deposition in papermaking, which method comprises the step of adding to paper furnish prior to sheet formation a multi-crosslinked cationic polymer, which polymer is prepared by the method comprising:
- (i) polymerizing substantially all of the monomer components by free radical initiation to form a base cationic polymer solution, wherein at least one of the monomer components is a cationic monomer component;
- and
- (ii) contacting the base cationic polymer solution with additional free radical initiator to form interconnecting bonds between the base cationic polymers to form the multi-crosslinked cationic polymer and the interconnecting bonds occur at points on the backbone of the cationic polymer, wherein the multi-crosslinked cationic polymer has a higher molecular weight than the base cationic polymer, which base cationic polymer is a homopolymer formed from diallydialkylammonium monomer.
Dependencies are inferred from the claim text.