Dispersing agents and their use
US6315867A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1997 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | Oct 30, 2017 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/43
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of dispersing a solid particulate material in an aqueous medium by addition to the aqueous medium of a dispersing agent wherein the solid particulate material is to be used as a filler or pigment in a sheet material which is required to come into contact with foodstuffs, wherein the dispersing agent is a composition comprising: PA1 (1) up to 0.25% by weight, based on the dry weight of the particulate solid material, of a water-soluble salt of a poly(acrylic acid) having a weight average molecular weight not greater than 20,000, and PA1 (2) from 0.02% to 1.5% by weight, based on the dry weight of the particulate solid material, of either PA2 (a) an anionic polyelectrolyte which comprises a water-soluble salt of a copolymer of acrylic acid with acrylamide; or PA2 (b) a water-soluble condensed phosphate salt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.