US3043808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear polyesters of dimethylmalonic acid and neopentyl glycol
Assignee: Eastman Kodak Co
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Filing: 1959-05-20
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Granted: 1962-07-10
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Expires: 1979-05-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Hugh J Hagemeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:36
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A PROCESS FOR PREPARING A HIGHLY POLYMERIC FIBERFORMING LINEAR POLYESTER HAVING A MELTING POINT OF AT LEAST 240*C. COMPRISING (A) FORMING A SUBSTANTIALLY MONOMERIC CONDENSATION PRODUCT BY HEATING REACTANTS CONSISTING OF ONE MOLE PROPORTION OF DIMETHYLMALONIC ACID AND AT LEAST ONE MOLE PROPORTION OF 2,2-DIMETHYL-1,3-PROPANEDIOL IN THE PRESENCE OF AN ACIDIC CONDENSING AGENT ESSENTIALLY COMPOSED OF PHOSPHERIC ACID UNTIL ABOUT ONE MOLE PROPORTION OF WATER IS DISTILLED OFF, (B) HEATING SAID MONOMERIC CONDENSATION PRODUCT IN A MELT-PHASE UNDER AN INERT ATMOSPHERE UNTIL A PREPOLYMER IS FORMED HAVING AN INTRINSIC VISCOSITY MEASURED IN A SOLUTION OF PHENOL AND TETRACHLOROETHANE OF FROM ABOUT 0.15 TO ABOUT 0.5, (C) COOLING THE PREPOLYMER TO A SOLID FORM, (D) GRANULATING THE PREPOLYMER, (E) HEATING IN A SOLID-PHASE THE GRANULATED PREPOLYMER AT FROM ABOUT 150*C, UP TO THE STICKING TEMPERATURE OF THE PREPOLYMER GRANULES IN AN ATMOSPHERE UNTIL A PREPOLYMER IS FORMED HAVING INTRINSIC VISCOSITY OF AT LEAST 0.6 AND A MELTING POINT OF AT LEAST 240*C.
Claim 2
Dependent Claim
161 words
A PROCESS FOR PREPARING A HIGHLY POLYMERIC FIBERFORMING LINEAR POLYESTER HAVING A MELTING POINT OF AT LEAST 240*C. COMPRISING (A) FORMING A SUBSTANTIALLY MONOMERIC CONDENSATION PRODUCT BY HEATING REACTANTS CONSISTING OF ONE MOLE PROPORTION OF DIMETHYLMALONIC ACID AND AT LEAST ONE MOLE PROPORTION OF 2,2-DIMETHYL-1,3-PROPANEDIOL IN THE PRESENCE OF AN ACIDIC CONDENSING AGENT ESSENTIALLY COMPOSED OF PHOSPHERIC ACID UNTIL ABOUT ONE MOLE PROPORTION OF WATER IS DISTILLED OFF, (B) HEATING SAID MONOMERIC CONDENSATION PRODUCT IN A MELT-PHASE UNDER AN INERT ATMOSPHERE UNTIL A PREPOLYMER IS FORMED HAVING AN INTRINSIC VISCOSITY MEASURED IN A SOLUTION OF PHENOL AND TETRACHLOROETHANE OF FROM ABOUT 0.15 TO ABOUT 0.5, (C) COOLING THE PREPOLYMER TO A SOLID FORM, (D) GRANULATING THE PREPOLYMER, (E) HEATING IN A SOLID-PHASE THE GRANULATED PREPOLYMER AT FROM ABOUT 150*C, UP TO THE STICKING TEMPERATURE OF THE PREPOLYMER GRANULES IN AN ATMOSPHERE UNTIL A PREPOLYMER IS FORMED HAVING INTRINSIC VISCOSITY OF AT LEAST 0.6 AND A MELTING POINT OF AT LEAST 240*C.
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) | 1965-07-09 | 1966-01-08 | 1966-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-09 | 1970-01-08 | 1970-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-09 | 1974-01-08 | 1974-07-10 | $7700.00 | Window Closed / Lapsed |