Low moisture thixotropic agents, methods and uses
US5158918A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1991 |
| Grant date | Oct 27, 1992 |
| Priority date | — |
| Expiry date | Jun 24, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B33/30
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.