Papermaking process
US4961825A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1989 |
| Grant date | Oct 9, 1990 |
| Priority date | — |
| Expiry date | Sep 22, 2009 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In the production of paper or pulp sheets from a paper stock, a binder is added which comprises cationic and anionic components to improve the paper characteristics and the stock characteristics, such that increased retention and a more readily dewatered stock are obtained. The anionic component consists of colloidal anionic particles having at least one surface layer of aluminum silicate or aluminum-modified silicic acid, such that the surface groups of the particles contain silicium and aluminum atoms in a ratio of from 9.5:0.5 to 7.5:2.5. The cationic component consists of cationic carbohydrate having a degree of substitution of 0.01-1.0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.