Rhombohedral calcium carbonate and accelerated heat-aging proces

Details Rhombohedral calcium carbonate and accelerated heat-aging proces Rhombohedral calcium carbonate and accelerated heat-aging proces

1992-06-19

1993-06-01

Straub, Gary P.

Chemistry of inorganic compounds

Carbon or compound thereof

Oxygen containing

106464, 1621812, C09C 102, C01F 524, D21H 1764

Patent

active

052157342

ABSTRACT:
A form of calcium carbonate having a blocky rhombohedral crystal structure and properties including a surface area of from about 3 to about 15 m.sup.2 /g, an average discrete particle size of from about 0.2 to about 0.9 micron, wherein the discrete particles have an aspect ratio less than about 2:1, and a particle size distribution such that at least about 60 weight percent of the particles have a size within 50 percent of the equivalent discrete particle spherical diameter, suitable for use as a filler material in papermaking to improve the optical properties of the resulting paper, is disclosed. An accelerated heat-aging process, including embodiments thereof which utilize hydrothermal techniques, for rapidly producing this form of calcium carbonate, and a related form of calcium carbonate having a hexagonal prismatic crystal structure and the same properties, in large quantities to meet the demand of the papermaking industry, as well as a method for using these materials in papermaking, are also disclosed.

REFERENCES:
patent: 3126253 (1964-03-01), Podschus
patent: 4420341 (1983-12-01), Ferrigno
patent: 5043017 (1991-08-01), Passaretti

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