Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With chemical or physical modification of liberated fiber
Reexamination Certificate
2005-06-21
2008-09-02
Hug, Eric (Department: 1791)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With chemical or physical modification of liberated fiber
C162S012000, C162S078000, C162S158000, C162S164100, C162S184000
Reexamination Certificate
active
07419568
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.
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G.C. Tesoro, Cross-Linking of Cellulose, in Handbook of Fiber Science and Technology, vol. II, M. Lewis and S.B. Sello eds, pp. 1-46, Mercel Decker, NY (1963).
Chmielewski Harry J.
Hamed Othman A.
McBee Dana B.
Hug Eric
Hunton & Williams LLP
Rayonier TRS Holdings Inc.
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