Silica-based sols
US7919535B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 2005 |
| Grant date | Apr 5, 2011 |
| Priority date | — |
| Expiry date | Apr 16, 2027 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/455
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to an aqueous sol containing silica-based particles which sol has a specific surface area of at least 115 m2/g aqueous sol and an S-value within the range of from 10 to 45% or contains silica-based particles having a specific surface area of at least 550 m2/g and less than 1000 m2/g SiO2. The invention further relates to processes for the production of said aqueous sol and the use of the aqueous sol containing silica-based particles as a drainage and retention aid in the production of paper as well as a process for the production of paper from an aqueous suspension containing cellulosic fibres, and optional filler, in which silica-based particles and at least one charged organic polymer are added to the cellulosic suspension.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.