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US 7,396,874 B2Granted
Cationic or amphoteric copolymers prepared in an inverse emulsion matrix and their use in preparing cellulosic fiber compositions
AssigneeHercules Incorporated
InventorsMartha Hollomon, Brian L. Walchuk, Frank J. Sutman
Life of this patent
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Abstract
A papermaking method and a composition which utilize, as a drainage aid, a water-soluble cationic or amphoteric copolymer prepared via a water-in-oil polymerization technique that, absent a cross-linking agent, is characterized by a Huggins' constant (k′) determined in 0.01M NaCl greater than 0.3 and a storage modulus (G′) at 6.3 Hz greater than 50 Pa.
Claims14
A copolymer composition comprising:
- at least one associative inverse emulsion copolymer, wherein said at least one associative inverse emulsion copolymer has associative properties provided by at least one emulsification surfactant that is solely a triblock polymeric surfactant in which the surfactant to monomer ratio is at least 3:100 wherein said at least one associative inverse emulsion copolymer consists only of:
- at least one nonionic polymer segment B consisting only of one or more ethylenically unsaturated nonionic monomers, and
- at least one cationic polymer segment C consisting only of one or more ethylenically unsaturated cationic monomers;
- the molar % ratio of B:C is from 99:1 to 1:99;
- and
- wherein said at least one associative inverse emulsion copolymer has a Huggins' constant (k′) determined in 0.01 M NaCl greater than 0.5;
- and said at least one associative inverse emulsion copolymer has a storage modulus (G′) in a 3.0 wt % actives polymer solution at 6.3 Hz greater than 50 Pa.
4 more elements
A copolymer composition comprising:
- at least one structured inverse emulsion copolymer, wherein said at least one structured inverse emulsion copolymer has associative properties provided by at least one emulsification surfactant that is a triblock polymeric surfactant in which the surfactant to monomer ratio is at least 3:100 wherein said at least one structured inverse emulsion copolymer consists only of:
- at least one nonionic polymer segment B consisting only of one or more ethylenically unsaturated nonionic monomers, and
- at least one cationic polymer segment C consisting only of one or more ethylenically unsaturated cationic monomers;
- the molar % ratio of B:C is from 99:1 to 1:99;
- and
- wherein said at least one structured inverse emulsion copolymer has a Huggins' constant (k′) determined in 0.01 M NaCl greater than 0.5;
- and said at least one structured inverse emulsion copolymer has a storage modulus (G′) in a 3.0 wt % actives polymer solution at 6.3 Hz greater than 50 Pa.
4 more elements
Dependencies are inferred from the claim text.