Carbon dioxide in neutral and alkaline sizing processes

Details Carbon dioxide in neutral and alkaline sizing processes Carbon dioxide in neutral and alkaline sizing processes

1993-05-21

1995-01-03

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

162179, 1621812, 1621814, 162183, D21H 2116

Patent

active

053783220

ABSTRACT:
In the non-acidic sizing of paper reaction between alkylketene dimer sizing agent and cellulose of cellulosic paper-making fibers is catalyzed by dissolving carbon dioxide in an aqueous vehicle of an aqueous pulp of the paper-making fibers; the carbon dioxide provides bicarbonate ions which catalyse the reaction; the bicarbonate ions may be generated by dissociation of the carbon dioxide in water, or by reaction of the carbon dioxide with calcium carbonate incorporated in the pulp as a filler for the paper, or with some other alkali present.

REFERENCES:
patent: 1878047 (1932-09-01), Wenger
patent: 5114538 (1992-05-01), Malatesta
patent: 5122230 (1992-06-01), Nakajima
Abstract Bulletin of the Institute of Paper Chemistry, vol. 54, No. 4, Oct. 1983, p. 426, Kamutzi, et al., "Mechanisms of Neural Sizing with Alkyl Diketenes".

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