Low moisture thixotropic agents, methods and uses

Details Low moisture thixotropic agents, methods and uses Low moisture thixotropic agents, methods and uses

1991-06-24

1992-10-27

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Clay containing

501150, 501141, 524297, 524445, C04B 3330

Patent

active

051589184

ABSTRACT:
Thioxotropic Fuller's earth clay minerals which are structurally double silica chains linked together through oxygen to form double-ribbed sheets held by aluminum and/or magnesium in octahedral coordination in an amphibole chain are vacuum dried and admixed with a stabilizing fluid, e.g., silicone fluid, to result in new, low moisture content thixotropic agents. The mineral products thus produced are superior thixotropes when compounded in plastics such as plastisols, adhesive sealants, coatings and other organic binder systems which are heat set or heat cured or moisture cured, and compliance coatings.
The methods involve reducing the moisture content of Fuller's earth clay, e.g., attapulgite, by (1) heating it under vacuum at an elevated temperature, preferably between 100.degree. C. and 300.degree. C., or (2) heating it at an elevated temperature, preferably between 100.degree. C. and 350.degree. C., and adding a stabilizing fluid, or (3) heating it under vacuum at an elevated temperature, preferably below 300.degree. C. and adding a stabilizing fluid, to preserve its low moisture properties.

REFERENCES:
patent: 4966871 (1990-10-01), Brooks
patent: 5049532 (1991-09-01), Brooks et al.
Hackh's Chemical Dictionary, 5th Ed., p. 60.
Kirk-Othmer Encyclopedia of Chem. Tech., vol. 17, John-Wiley, 1978, 3rd ed., p. 809.
Grim, Ralph, Clay Mineralogy, McGraw Hill, 1968, pp. 32, 44, 45, 113-114, 154, 183, 189, 343-347,383, 422, 468 and 582.
Haden, W. L., Jr. (Patton, ed.), "Hydrated Magnesium Silicate", Pigment Handbook, vol. 1, Wiley-Interscience, 1973, pp. 269-273.

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