US3795650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clay thixotrope for polyester resins and use thereof
Assignee: BASF Catalysts LLC
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Filing: 1972-10-16
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Granted: 1974-03-05
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Expires: 1992-10-16
Abstract
Abstract A THIXOTROPE IN THE FORM OF A GELATINOUS PASTE IS PRODUCED BY DISSOLVING A SMALL AMOUNT OF A LIQUID POLYOL IN A LIQUID UNSATURATED POLYESTER RESIN, THEREAFTER ADDING APPROXIMATELY 20 PERCENT BY WEIGHT OF A FINELY DIVIDED GRADE OF COLLOIDAL CLAY, PREFERABLY POWDERED ATTAPULGITE CLAY, AND THEN APPLYING MECHANICAL WORK (SHEAR) TO THE MIXTURE. THE RATIO OF CLAY TO POLYOL IN THE PASTE IS IN THE RANGE OF ABOUT 3 TO 6:1 TO IMPART THIXOTROPY TO A CUT POLYESTER RESIN, THE GELATINOUS PASTE IS ADDED IN AMOUNT SUCH THAT THE CLAY CONTENT OF THE RESULTING THIXOTROPIC COMPOSITION IS LESS THAN ABOUT 3 PERCENT BY WEIGHT AND THE FREE POLYOL CONTENT IS LESS THAN 0.5 PERCENT BY WEIGHT.
Inventors
- 👤 R Burns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:56
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/346
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |