公开(公告)号：EP1154899A2

公开(公告)日：2001-11-21

申请号：EP99958877.5

申请日：1999-11-10

Applicant: WEYERHAEUSER COMPANY

Inventor： GRAEF, Peter, A. ,  HOWARD, Fred, B. ,  MILLER, Charles, E. ,  BOLSTAD, Clifford, R. ,  COLIN, Elston ,  MARSH, David, G. ,  EDMARK, Richard, A. ,  LI, Yong

IPC: B32B5/16 ,  A61F13/15

CPC classification number: A61F13/5323 ,  A61F13/535 ,  A61F13/537 ,  A61F2013/530985 ,  B32B5/22

Abstract: An absorbent composite having a reticulated core and a fibrous stratum is disclosed. The core and stratum are integrally formed, and the stratum is coextensive with an outward surface of the core. In one embodiment, the composite includes strata on opposing outward facing surfaces of the core. The core includes a fibrous matrix and absorbent material. The fibrous matrix defines voids and passages between the voids, which are distributed throughout the composite. Absorbent material is located within some of the voids. On wetting, absorbent material located in these voids is expandable into the void. Absorbent articles that include the composite are also disclosed.

公开(公告)号：EP1238142A1

公开(公告)日：2002-09-11

申请号：EP00970682.1

申请日：2000-10-06

Applicant: Weyerhaeuser Company

Inventor： JEWELL, Richard, A. ,  KOMEN, Joseph, Lincoln ,  SU, Bing ,  WEERAWARNA, S., Ananda ,  LI, Yong

IPC: D21C9/00 ,  D21H11/20 ,  C08B15/04

CPC classification number: D06M13/388 ,  C08B15/04 ,  D21C9/004 ,  D21C9/005 ,  D21H11/20

Abstract: The invention is directed to a method of making carboxylated cellulose fibers whose fiber strength and degree of polymerization is not significantly sacrificed. The method involves the use of cyclic nitroxide free radical compounds as a primary oxidant and a hypohalite salt as a secondary oxidant in an aqueous environment. Preferably the oxidized cellulose is then stabilized against D.P. loss in alkaline environments and color reversion with a reducing agent such as sodium borohydride. Alternatively it may be treated with an oxidant such as sodium chlorite. The method results in a high percentage of carboxyl groups located at the fiber surface. The product is especially useful as a papermaking fiber where it contributes strength and has a higher attraction for cationic additives. The product is also useful as an additive to recycled fiber to increase strength. The method can be used to improve properties of either virgin or recycled fiber. It does not require high α-cellulose fiber but is suitable for regular market pulps.