Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1996-07-19
1999-11-30
Chin, Peter
Paper making and fiber liberation
Processes and products
Non-fiber additive
1621643, 1621646, 162175, 162183, D21H 2116
Patent
active
059936045
ABSTRACT:
The present pertains to an improved method of internally sizing a cellulosic article and an improved internally sized cellulosic article where a water-dispersible, water- and alkali-insoluble internal sizing agent from an interpolymer of an ethylenically unsaturated hydrocarbon monomer and an ethylenically unsaturated carboxylic acid comonomer is applied to fiber stock or pulp slurry some amount of time subsequent to the instance of application of a retention aid. The invention also includes a novel internal sizing composition where the interpolymer is rendered water-dispersible by reaction with an inorganic neutralizing cationic compound. The improved method is particularly well suited for paper making wherein substantially improved sizing performance is obtainable. Internal sizing agents based on inorganic neutralizing cationic compounds such as, for example, potassium hydroxide, provide the surprising advantage of hard water resistance.
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Cooper James L.
Finlayson Malcolm F.
Gathers John J.
Oliver Stephen M.
Springs Kenneth E.
Chin Peter
The Dow Chemical Company
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