Method of improving retention and drainage in a papermaking process using a diallyl-N,N-disubstituted ammonium halide-acrylamide copolymer and a structurally modified cationic polymer
First Claim
1. A method of increasing retention and drainage in a papermaking furnish comprising adding to the furnish an effective amount of a diallyl-N,N-disubstituted ammonium halide/acrylamide copolymer and an effective amount of a cationic structurally-modified water soluble polymer, wherein the cationic structurally-modified water-soluble polymer prepared by initiating polymerization of an aqueous solution of from about 95 to about 5 mole percent of an acrylamide monomer of formula wherein R7, R8 and R9 are independently selected from H and alkyl and from about 5 to about 95 mole percent of a cationic monomer of formula
wherein A1 is O or NH;
- B1 is C2-C4 alkylene or hydroxypropylene;
R1 is H or CH3, R2 and R4 are independently C1-C2 alkyl;
R3 is H, C1-C2 alkyl or arylalkyl; and
X1 is an anionic counterion under free radical polymerization conditions to form a polymer solution and adding at least one structural modifier to the polymer solution after at least 30% polymerization of the monomers has occurred.
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Accused Products
Abstract
A method of increasing retention and drainage in a papermaking furnish comprising adding to the furnish an effective amount of a diallyl-N,N-disubstituted ammonium halide/acrylamide copolymer and an effective amount of a cationic structurally-modified water-soluble polymer, the cationic structurally-modified water-soluble polymer prepared by initiating polymerization of an aqueous solution of from about 95 to about 5 mole percent of an acrylamide monomer and from about 5 to about 95 mole percent of a cationic monomer under free radical polymerization conditions to form a polymer solution and adding at least one structural modifier to the polymer solution after at least 30% polymerization of the monomers has occurred.
56 Citations
10 Claims
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1. A method of increasing retention and drainage in a papermaking furnish comprising adding to the furnish an effective amount of a diallyl-N,N-disubstituted ammonium halide/acrylamide copolymer and an effective amount of a cationic structurally-modified water soluble polymer, wherein the cationic structurally-modified water-soluble polymer prepared by initiating polymerization of an aqueous solution of from about 95 to about 5 mole percent of an acrylamide monomer of formula
wherein R7, R8 and R9 are independently selected from H and alkyl and from about 5 to about 95 mole percent of a cationic monomer of formula wherein A1 is O or NH; - B1 is C2-C4 alkylene or hydroxypropylene;
R1 is H or CH3, R2 and R4 are independently C1-C2 alkyl;
R3 is H, C1-C2 alkyl or arylalkyl; and
X1 is an anionic counterion under free radical polymerization conditions to form a polymer solution and adding at least one structural modifier to the polymer solution after at least 30% polymerization of the monomers has occurred. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- B1 is C2-C4 alkylene or hydroxypropylene;
Specification
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- Resources
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Current AssigneeEcolab USA Incorporated (Ecolab, Inc.)
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Original AssigneeONDEO Nalco Company (Ecolab, Inc.)
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InventorsZelenev, Andrei S., Chen, Jiwei, Wong Shing, Jane B., Gray, Ross T.
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Primary Examiner(s)Griffin, Steven P.
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Assistant Examiner(s)HALPERN, MARK
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Application NumberUS09/947,675Time in Patent Office677 DaysField of Search162/164.1, 162/158, 162/164.3, 162/164.6, 162/168.1, 162/168.2, 162/168.3, 162/175, 162/181.1, 162/183US Class Current162/164.1CPC Class CodesC08L 2205/02 containing two or more poly...C08L 2666/04 Macromolecular compounds ac...C08L 33/24 Homopolymers or copolymers ...D21H 17/375 Poly(meth)acrylamideD21H 21/10 Retention agents or drainag...D21H 21/52 Additives of definite lengt...D21H 23/765 Addition of all compounds t...
