Cationic polymeric composition for imparting wet and dry strength to pulp and paper
AssigneeNalco Chemical Company
InventorsEdward G. Ballweber, Roger H. Jansma, Kenneth G. Phillips
Life of this patent
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Abstract
A blend which contains homopolymers useful for imparting wet and dry strength to pulp and paper fibers which comprises a major amount of non-ionic polyacrylamide, together with glyoxal to impart crosslinking and a cationic regulator selected from the group consisting of a low molecular weight dimethyl amine epichlorohydrin copolymer, a low molecular weight ethylene dichloride ammonia condensation polymer, and a polyvinyl benzyl trimethyl ammonium chloride polymer. A buffer such as tetrasodium pyrophosphate may be used. A dosage of 0.2-5% by weight (preferred 0.5-2% by weight) based on the dry weight of fiber is utilized.
Claims4
A composition for imparting wet and dry strength to paper fiber which comprises a blend of (1) polyacrylamide 40-95% by weight;
- (2) a cationic regulator selected from the group consisting of a low molecular weight dimethyl amine epichlorohydrin copolymer, a low molecular weight ethylene dichloride ammonia condensation polymer, and polyvinyl benzyl trimethyl ammonium chloride polymer in the amount of 4-14% by weight;
- and (3) glyoxal 2-50% by weight, and which is utilized in a dosage of 0.2-5% based on dry weight of fiber.
A blend composition for imparting wet and dry strength to paper fibers which composition contains about 90 parts by weight of polyacrylamide;
- 5-20 parts by weight of a cationic regulator selected from the group consisting of a low molecular weight dimethyl amine epichlorohydrin copolymer, a low molecular weight ethylene dichloride ammonia condensation polymer, and polyvinyl benzyl trimethyl ammonium chloride polymer;
- 10-30 parts glyoxal;
- and 20 parts tetrasodium pyrophosphate.
Dependencies are inferred from the claim text.