Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With chemical or physical modification of liberated fiber
Reexamination Certificate
2008-01-22
2008-01-22
Hug, Eric (Department: 1731)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With chemical or physical modification of liberated fiber
C162S078000, C162S157600, C162S158000, C162S168100, C162S182000, C162S183000, C162S184000
Reexamination Certificate
active
07320740
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.
REFERENCES:
patent: 2764573 (1956-09-01), Reibnitz et al.
patent: 3112156 (1963-11-01), Vail et al.
patent: 3224926 (1965-12-01), Bernardin
patent: 3241553 (1966-03-01), Steiger
patent: 3260565 (1966-07-01), Beachem
patent: 3434918 (1969-03-01), Bernardin
patent: 3440135 (1969-04-01), Chung
patent: 3756913 (1973-09-01), Wodka
patent: 3932209 (1976-01-01), Chatterjee
patent: 4035147 (1977-07-01), Sangenis et al.
patent: 4204054 (1980-05-01), Lesas et al.
patent: 4472167 (1984-09-01), Welch
patent: 4820307 (1989-04-01), Welch et al.
patent: 4822453 (1989-04-01), Dean et al.
patent: 4882453 (1989-11-01), Chelsea
patent: 4889595 (1989-12-01), Herron et al.
patent: 4936865 (1990-06-01), Welch et al.
patent: 5042986 (1991-08-01), Kitchens et al.
patent: 5137537 (1992-08-01), Herron et al.
patent: 5225047 (1993-07-01), Graef et al.
patent: 5273549 (1993-12-01), Didier et al.
patent: 5366591 (1994-11-01), Jewell
patent: 5399240 (1995-03-01), Graef et al.
patent: 5858021 (1999-01-01), Sun et al.
patent: 5938995 (1999-08-01), Koltisko, Jr. et al.
patent: 5998511 (1999-12-01), Westland et al.
patent: 6207278 (2001-03-01), Jewell et al.
patent: 6290867 (2001-09-01), Kielbania, Jr. et al.
patent: 6620293 (2003-09-01), Sears et al.
patent: 2002/0096276 (2002-07-01), Leithem et al.
patent: 2003/0070776 (2003-04-01), Crow et al.
patent: 0427316 (1997-07-01), None
patent: WO 97/04162 (1997-02-01), None
patent: WO 99/31312 (1999-06-01), None
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 & Willams LLP
Rayonier TRS Holdings Inc.
LandOfFree
Chemically cross-linked cellulosic fiber and method of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Chemically cross-linked cellulosic fiber and method of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chemically cross-linked cellulosic fiber and method of... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2765968