Crosslinked cellulose products and method for their preparation
US5225047A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1989 |
| Grant date | Jul 6, 1993 |
| Priority date | — |
| Expiry date | Aug 17, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2013/530474
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The invention is a method of making a wet formed, sheeted, readily reslurriable sheeted crosslinked cellulose and the products made by the method. Crosslinked wood pulp fibers tend to be quite brittle. If crosslinked while in sheeted form, the sheets cannot be readily defibered, either in a wet or dry state, without serious fiber degradation. The sheet products of the present invention can be easily redispersed or repulped in water without significant fiber breakage. The present products are made by including within the sheet, while still in wet form, a debonding or softening agent which is preferably added before the latent crosslinking reactant. Most preferably the debonder is added prior to the headbox of a paper machine and the crosslinking reactant is applied near the end of the forming wire or at the press section. The treated sheet is dried conventionally. Crosslinking may occur entirely during drying or during a period of additional heating, usually at a temperature in excess of 100.degree. C. for a short period of time. Conventional debonding agents and crosslinking reactants are suitable. The softening agent apparently reduces or prevents adhesive bonding between adjacent…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.