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US 10,753,043 B2Granted
Low viscosity kraft fiber having an enhanced carboxyl content and methods of making and using the same
AssigneeGP Cellulose GmbH
InventorsArthur J. Nonni, Charles E. Courchene, Blair Roderick Carter
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Abstract
A pulp fiber with an enhanced carboxyl content resulting in improved antimicrobial, anti-yellowing and absorptive properties. Methods for making the kraft pulp fiber and products made from it are also described.
Claims16
A method of making a modified kraft fiber comprising:
- subjecting cellulose fiber to a kraft pulping step;
- oxygen delignifying the cellulose fiber following the kraft pulping step;
- bleaching the cellulose fiber following oxygen delignification using a five-stage bleaching process;
- oxidizing the cellulose fiber with a peroxide and a catalyst chosen from at least one of copper and iron under acidic conditions during the second stage of the five-stage bleaching process;
- and
- treating the fiber with a carboxylating acid treatment comprising a combination of either sodium chlorite and hydrogen peroxide or chlorine dioxide and hydrogen peroxide during the third stage of the five-stage bleaching process.
3 more elements
Dependencies are inferred from the claim text.