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US 10,407,830 B2Granted
Use of surfactant to treat pulp and improve the incorporation of kraft pulp into fiber for the production of viscose and other secondary fiber products
AssigneeGP Cellulose GmbH
InventorsArthur J. Nonni, Charles E. Courchene, Christopher M. Slone, Philip R. Campbell, Steven C. Dowdle, Joel M. Engle
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Abstract
A surfactant treated bleached softwood kraft pulp fiber, useful as a starting material in the production of cellulose derivatives including cellulose ether, cellulose esters and viscose, is disclosed. Methods for making the kraft pulp fiber and products made from it are also described.
Claims20
A method for making a viscose solution comprising:
- treating a cellulosic material comprising a surfactant treated kraft pulp with alkali and carbon disulfide,
- wherein the surfactant treated kraft pulp has been made by a process comprising:
- digesting and oxygen delignifying a softwood cellulose pulp to a kappa number of less than 8;
- bleaching the cellulosic kraft pulp using a multi-stage bleaching process;
- and treating the pulp with at least one surfactant.
2 more elements
A method for making a viscose solution comprising:
- treating a cellulosic material comprising a surfactant treated kraft pulp with alkali and carbon disulfide,
- wherein the surfactant treated kraft pulp has been made by a process comprising:
- digesting and oxygen delignifying a softwood cellulose pulp to a kappa number of less than 8;
- bleaching the cellulosic kraft pulp using a multi-stage bleaching process;
- 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 treating the pulp with at least one surfactant.
3 more elements
Dependencies are inferred from the claim text.