Chemically cross-linked cellulose fiber and method of making same
First Claim
1. A cross-linked cellulosic fiber having a centrifuge retention capacity of less than about 0.48 grams of a 0.9% by weight saline solution per gram of fiber, and a third acquisition insult time of less than 10 seconds.
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Abstract
The present invention relates to cross-linked cellulosic fiber having improved absorbency characteristics when compared to conventional cross-linked fibers. The cross-linked cellulosic fiber is obtainable by reacting pulp in the sheet or fluff form with one or more reagents selected from organic molecule having acid and aldehyde functional groups “acid aldehydes.” The invention also relates to a method of producing the cross-linked fiber. The method includes heating the treated cellulosic fibers to promote intrafiber cross-linking. The cross-linked fibers are characterized by having an improved centrifuge retention capacity, fluid acquisition rate, resiliency, absorbent capacity, absorbency under load, and other absorbent properties. The inventive cross-linked fibers are useful in forming absorbent composites, and in particular absorbent cores for use in absorbent articles.
40 Citations
31 Claims
- 1. A cross-linked cellulosic fiber having a centrifuge retention capacity of less than about 0.48 grams of a 0.9% by weight saline solution per gram of fiber, and a third acquisition insult time of less than 10 seconds.
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12. A cross-linked cellulosic fiber prepared by contacting a cellulosic fiber with one or more cross-linking agents, whereby the fiber has a centrifuge retention capacity of less than about 0.48 grams of a 0.9% by weight saline solution per gram of fiber, and a third acquisition insult time of less than 10 seconds.
- 13. A cross-linked cellulosic fiber cross-linked by a cross-linking agent selected from one or more acid aldehyde organic molecules containing aldehyde and carboxylic acid functional groups, whereby the fiber has a centrifuge retention capacity of less than about 0.60 grams of a 0.9% by weight saline solution per gram of fiber, and a third acquisition insult time of less than 10 seconds.
Specification