Process for the treatment of a pigment suspended in water and method of manufacturing paper
US5266163A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 6, 1992 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Jan 6, 2012 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/69
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Pigments for the papermaking industry, in particular kaolin, are treated with a high molecular polymerizate that is solvated by means of carboxylate groups and belongs to an ethylenically unsaturated, radically polymerizable carboxylic acid as the binder. By gradually adding an acidifying agent the binder is coacervated and totally precipitated on the pigment. It is important that the quantity of the acidifying agent is limited in such a manner that the pigment retains a negative surface charge and the coacervate still contains water. With the pigment treated thus printing papers with increased pigment content and/or increased breaking strength can be manufactured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.