Colloidal composition and its use in the production of paper and paperboard
US5571379A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Nov 5, 1996 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H23/76
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The composition comprises a water dispersible colloidal siliceous material, such as a swelling clay, in intimate association with a low molecular weight water soluble high charge density organic polymer, such as a polyacrylic acid or a polyamine, the ionicity of the siliceous material being significantly modified by the charge on the polymer. The composition may be produced by reacting the siliceous material and the organic polymer in an aqueous phase system at a concentration, for example, of from 5 to 25% by weight of the polymer on swelling clay solids. The composition is suitable for use as a retention/drainage agent in paper or paperboard production, preferably after the addition of a conventional high molecular weight flocculating agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.