Modified cellulose from chemical kraft fiber and methods of making and using the same
AssigneeGP Cellulose GmbH
InventorsArthur J. Nonni, Charles E. Courchene, Christopher Michael Slone, Peter R. Abitz
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Abstract
A modified kraft pulp fiber with unique properties is provided. The modified fiber can be a modified bleached kraft fiber that is almost indistinguishable from its conventional counterpart, except that it has a low degree of polymerization (DP). Methods for making the modified fiber and products made from it are also provided. The method can be a one step acidic, iron catalyzed peroxide treatment process that can be incorporated into a single stage of a multi-stage bleaching process. The products can be chemical cellulose feedstocks, microcrystalline cellulose feedstocks, fluff pulps and products made from them.
Claims29
A method of making a kraft fiber comprising:
- bleaching a cellulosic kraft pulp using a multi-stage bleaching process;
- and oxidizing the kraft pulp during at least one stage of the multi-stage bleaching process with a peroxide and a catalyst under acidic condition;
- wherein the multi-stage bleaching process comprises at least one bleaching stage following the oxidation stage;
- and
- wherein the multi-stage bleaching process has no alkaline stage following the oxidation stage.
Dependencies are inferred from the claim text.