US3055867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallic tin as a catalyst in the preparation of polyesters by reaction of a polyol and a polycarboxylic acid
Assignee: PPG Industries Inc
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Filing: 1959-03-31
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Granted: 1962-09-25
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Expires: 1979-03-31
Abstract
No abstract record available.
Inventors
- 👤 Bras Louis R Le
- 👤 Donald F Stahr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:17
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G63/02; C08G63/12; C08G63/16; C08G63/20; C08G63/85
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
191 words
THE METHOD OF PREPARING A POLYMERIC POLYESTER BY DIRECT ESTERIFICATION REACTION WITH COMPRISES FORMING A MIXTURE, THE REACTIVE COMPONENTS OF WHICH CONSIST ESSENTIALLY OF (A) A FREE ALCOHOL CONTAINING AT LEAST TWO HYDROXYL GROUPS, (B) A CARBONYL COMPOUND SELECTED FROM THE CLASS CONSISTING OF A FREE DICARBOXYLIC ACID AND THE FREE ANHYDRIDE THEREOF, SAID ALCOHOL AND SAOID CARBONYL COMPOUND CONSISTING SOLELY OF ATOMS OF CARBON, HYDROGEN AND OXYGEN, THE ALCOHOL BEING PRESNET IN AN AMOUNT TO PROVIDE A PRODUCT OF A HYDROXYL NUMBER BETWEEN ABOUT 40 AND ABOUT 700, AND (C) A CATALYST CONTAINING ABOUT 0.001 TO ABOUT 1 PERCENT BY WEIGHT BASED UPON THE MIXTURE, OF A MATERIAL SELCETED FROM THE CLASS CONSISTING OF FREE TIN METAL AND METALLIC TIN ALLOUED WITH ANOTHER METAL SELECTED FROM THE CLASS CONSISTING OF ANTIMONY, COPPER, ZINC, CADMIUM, BISMUTH, LEAD AND MERCURY, THE ALLOY CONTAINING ABOUT 50 TO ABOUT 90 PERCENT BY WEIGHT OF TIN THE ALLOY BEING PRESENT IN THE REACTION MIXTURE ALONE WITH FREE COMPOUND (B), AND HEATING THE MIXTURE TO EVOLVE WATER AND DIRECTLY TO FORM SAID POLYMERIC POLYESTER, HEATING BEING CONTINUED UNTIL AN ACID VALUE BELOW ABOUT 20 IS OBTAINED.
Claim 2
Independent Claim
191 words
THE METHOD OF PREPARING A POLYMERIC POLYESTER BY DIRECT ESTERIFICATION REACTION WITH COMPRISES FORMING A MIXTURE, THE REACTIVE COMPONENTS OF WHICH CONSIST ESSENTIALLY OF (A) A FREE ALCOHOL CONTAINING AT LEAST TWO HYDROXYL GROUPS, (B) A CARBONYL COMPOUND SELECTED FROM THE CLASS CONSISTING OF A FREE DICARBOXYLIC ACID AND THE FREE ANHYDRIDE THEREOF, SAID ALCOHOL AND SAOID CARBONYL COMPOUND CONSISTING SOLELY OF ATOMS OF CARBON, HYDROGEN AND OXYGEN, THE ALCOHOL BEING PRESNET IN AN AMOUNT TO PROVIDE A PRODUCT OF A HYDROXYL NUMBER BETWEEN ABOUT 40 AND ABOUT 700, AND (C) A CATALYST CONTAINING ABOUT 0.001 TO ABOUT 1 PERCENT BY WEIGHT BASED UPON THE MIXTURE, OF A MATERIAL SELCETED FROM THE CLASS CONSISTING OF FREE TIN METAL AND METALLIC TIN ALLOUED WITH ANOTHER METAL SELECTED FROM THE CLASS CONSISTING OF ANTIMONY, COPPER, ZINC, CADMIUM, BISMUTH, LEAD AND MERCURY, THE ALLOY CONTAINING ABOUT 50 TO ABOUT 90 PERCENT BY WEIGHT OF TIN THE ALLOY BEING PRESENT IN THE REACTION MIXTURE ALONE WITH FREE COMPOUND (B), AND HEATING THE MIXTURE TO EVOLVE WATER AND DIRECTLY TO FORM SAID POLYMERIC POLYESTER, HEATING BEING CONTINUED UNTIL AN ACID VALUE BELOW ABOUT 20 IS OBTAINED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |