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.
Claims26
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 about 1 cP, measured at 0.1 weight-% polymer concentration in 1 M NaCl, at 25° C. and pH 8.0-8.5, using 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 by cleaving a backbone of the acrylamide polymer;
- and
- (iii) cross-linking the acrylamide polymer subjected to cleaving by introducing a polyfunctional cross-linking agent to said aqueous medium for obtaining the aqueous composition of structurally modified water-soluble polymer.
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An aqueous composition, comprising a structurally modified water-soluble polyacrylamide polymer, wherein an intrinsic viscosity of the structurally modified water-soluble polymer is at least 0.5 dl/g, preferably at least 0.7 dl/g and more preferably at least 1.0 dl/g, as determined by gel permeation chromatography (GPC).
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Dependencies are inferred from the claim text.