Calcium carbonate dispersions
US4509987A · kind A · utility
24Cited by
4References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1982 |
| Grant date | Apr 9, 1985 |
| Priority date | — |
| Expiry date | Nov 17, 2002 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/52
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Concentrated (e.g. above 72% by weight) dispersions of calcium carbonate ground to a particle size such that at least 87% by weight of the particles are less than 2 .mu.m in size have a tendency to gel on standing. In the invention this tendency is minimized or eliminated by using, as dispersing agent, a copolymer of from 5 to 75% by weight AMPS and 95 to 25% by weight acrylic acid, or a water soluble salt thereof, having a molecular weight in the range 1000 to 20,000.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.