Modified cellulose from chemical kraft fiber and methods of making and using the same

摘要

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.

主权项

1. A diaper, incontinence device, or other urine absorbing product comprising a modified kraft fiber produced by 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, wherein the ISO brightness of the kraft pulp fiber at the end of the multi-stage bleaching process comprising the at least one oxidation stage is at least about 88, wherein the modified kraft fiber exhibits a hemicellulose content from about 16% to about 25%, an aldehyde content ranging from about 1 meq/100 g to about 9 meq/100 g, and a carboxyl content of at least about 3 meq/100 g, and wherein the kraft fiber does not comprise an optical brightening agent.