Calcium carbonate dispersions

Details Calcium carbonate dispersions Calcium carbonate dispersions

1982-11-17

1985-04-09

Andrews, M. J.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106308M, 106308N, 241 16, C01F 1118, C09C 304

Patent

active

045099871

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.

REFERENCES:
patent: 4242318 (1980-12-01), Brahm et al.
patent: 4279661 (1981-07-01), Strauch et al.
patent: 4370171 (1983-01-01), Robinson et al.
patent: 4450013 (1984-05-01), Hirsch et al.

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