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US 10,822,462 B2Granted
Paper product and method for increasing the strength thereof
AssigneeKemira Oyj
InventorsYuping Luo, Roopa Tellakula, Scott Rosencrance
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Abstract
The present disclosure relates to a novel aqueous composition of a structurally modified, water soluble polymer suitable for papermaking and to a method for manufacturing it. The method includes cleaving a backbone of the acrylamide polymer by a degradation agent and cross-linking the acrylamide polymer subjected to cleaving by using a polyfunctional cross-linking agent.
Claims18
A method for manufacturing an aqueous composition of a structurally modified water-soluble polymer for use in papermaking, comprising:
- (i) providing an acrylamide polymer having a standard viscosity of at least 1 cP, measured at 0.1 weight-% polymer concentration in 1 M NaCl, at 25° C. and pH 8.0-8.5, using a Brookfield DVII T viscometer, in an aqueous medium;
- (ii) incorporating in said aqueous medium a degradation agent capable of reducing the standard viscosity of the acrylamide polymer in the aqueous environment, such that a backbone of the acrylamide polymer is cleaved by the degradation agent;
- and
- (iii) cross-linking the acrylamide polymer subjected to the cleaving by the degradation agent by introducing a polyfunctional cross-linking agent to said aqueous medium for obtaining the aqueous composition of structurally modified water-soluble polymer.
1 more element
Dependencies are inferred from the claim text.