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US 2014/0274680 A1Published application
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.
Claims38
A chemically modified kraft fiber comprising cellulose which has been catalytically oxidized and treated with a carboxylating acid, having a carboxyl content greater than about 6 meq/100 g, an aldehyde content of less than 1 meq/100 g and viscosity less than 5.5 mPa·s.
A method of making a modified acid-treated kraft fiber comprising:
- subjecting cellulose fiber to a kraft pulping step;
- oxygen delignifying the cellulose fiber;
- bleaching the cellulose fiber using a multi-stage bleaching process;
- oxidizing the cellulose fiber with a peroxide and a catalyst under acidic conditions;
- and
- treating the fiber with a carboxylating acid.
3 more elements
Dependencies are inferred from the claim text.