Method of treating paper forming wire surface
AssigneeHercules Incorporated
InventorsFushan Zhang, Tien-Feng Ling
Life of this patent
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Abstract
A method for inhibiting resinous and sticky substances from filling or forming deposits on or within papermaking forming wire, by applying to said wire an effective inhibiting amount of a composition comprising at least one cationic agent selected from the group consisting of (a) cationic polyureas, (b) hydrophobically modified cationic polymers, (c) alkylammonium or/and alkylimidazolium salts, and optionally at least one nonionic amphiphilic copolymer selected from (i) hydrophobically modified polyethylene glycols], (ii) hydrophobically modified cellulose ethers, (iii) copolymers of vinyl alcohol and vinyl alkonate, (iv) polyoxyalkylene block copolymers, and (v) hydrophilically modified polydimethylsiloxanes.
Claims13
A method for inhibiting resinous and sticky substances from filling or forming deposits on or within papermaking forming wire, by applying to said wire an effective inhibiting amount of composition comprising at least one cationic agent, wherein the at least one cationic agent is selected from the group consisting of
- (a) cationic polyureas, wherein the cationic polyureas comprises bis(2-chloroethyl) ether-1,3-bis(3-(dimethylamino)propyl)urea copolymer and has a molecular weight in the range of from 1000 to 100,000,
- (b) hydrophobically modified cationic polymers,
- (c) alkylammonium or/and alkylimidazolium salts, and
- optionally, further comprising at least a non-ionic amphiphilic polymer;
- and wherein the composition is sprayed on paper forming wire through at least an aqueous low and/or high pressure cleaning or lubrication shower on the machine side and/or sheet side of the wire at a concentration in said shower water from about 1 ppm to 10000 ppm and at a rate of about 0.01 to about 0.20 gallon shower water per minute per inch width of wire.
Dependencies are inferred from the claim text.