Silica sols in papermaking
US5643414A · kind A · utility
25Cited by
15References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1994 |
| Grant date | Jul 1, 1997 |
| Priority date | — |
| Expiry date | Jun 27, 2014 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/455
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Silica sols having a high content of microgel and aluminum modified particles with high specific surface area. The sols can be prepared by a process comprising acidification of a water glass solution, alkalization at a certain dry substance content, particle growth and aluminum modification. The sols are particularly suitable for use as additives, in combination with cationic polymers, in papermaking.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.