Absorbent paper comprising polymer-modified fibrous pulps and wet-laying process for the production thereof
US4986882A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 1989 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | Jul 11, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61L15/28
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Processes are described for making highly absorbent tissues and towels by wet-laying pulps comprising particular polycarboxylate polymer-modified fibrous pulps such as mildly hydrolyzed methyl acrylate-grafted softwood kraft pulps; these pulps have distinct protonated and alkali-metal-cation-exchanged states. The wet-laying processes are adapted to exploit the very different behavior of the polymer-modified fibrous pulps in function of the two states. The preferred wet-laying processes described herein are continuous processes embodying one or more on-line chemical treatment steps which chemically switch state of the polymer-modified fibrous pulp component in a wet web on the papermaking machine to improve the processing thereof by averting or minimizing tendencies to mechanically or thermally degrade.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.