US2852491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear polyesters containing nu-substituted amines
Assignee: Eastman Kodak Co
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Filing: 1954-03-11
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Granted: 1958-09-16
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Expires: 1974-03-11
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:11
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/685; C08G63/6854; C08G69/00; C08G69/44; Y; Y10; Y10S; Y10S8/00; Y10S8/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
THE METHOD OF PREPARING IMPROVED LINEAR POLYESTERS WHICH COMPRISES REACTING TOGETHER AT A TEMPERATURE OF 150-300*C. TO AN INTRINSIC VISCOSITY OF AT LEAST 0.4, A MIXTURE OF (1) A COMPOUND SELECTED FROM THE GROUP CONSISTING OF DIHYDRIC ALCOHOLS OF 2-12 CARBON ATOMS AND 2-4 CARBON ATOM ACYL ESTERS THEREOF, (2) A COMPOUND SELECTED FROM THE GROUP CONSISTING OF P-DICARBOXYLIC AROMATIC ACIDS AND 1-4 CARBON ATOM ALKYL ESTERS THEREOF, AND (3) AN N-SUBSTITUTED AMINE SELECTED FROM THE GROUP CONSISTING OF N-ALKYL HYDROXY POLYMETHYLENE AMINES CONTAINING 3-12 CARBON ATOMS WHEREIN THE N-ALKYL GROUP CONTAINS 2-6 CARBON ATOMS, N,N''-DIALKYL POLYMETHYLENE DIAMINES CONTAINING 4-18 CARBON ATOMS WHEREIN EACH ALKYL GROUP CONTAINS 1-6 CARBON ATOMS, AND N,N''-DIARYLPOLYMETHYLENE DIAMINES CONTAINING 14-22 CARBON ATOMS WHEREIN EACH OF SAID ARYL GROUPS CONTAINS 6-8 CARBON ATOMS, SAID POLYESTER CONTAINING 5-20 MOLE PERCENT OF SAID AMINE AND AT LEAST 1.3 TIMES AS MUCH OF SAID COMPOUND (1) AS SAID COMPOUND (2).
Claim 2
Independent Claim
151 words
THE METHOD OF PREPARING IMPROVED LINEAR POLYESTERS WHICH COMPRISES REACTING TOGETHER AT A TEMPERATURE OF 150-300*C. TO AN INTRINSIC VISCOSITY OF AT LEAST 0.4, A MIXTURE OF (1) A COMPOUND SELECTED FROM THE GROUP CONSISTING OF DIHYDRIC ALCOHOLS OF 2-12 CARBON ATOMS AND 2-4 CARBON ATOM ACYL ESTERS THEREOF, (2) A COMPOUND SELECTED FROM THE GROUP CONSISTING OF P-DICARBOXYLIC AROMATIC ACIDS AND 1-4 CARBON ATOM ALKYL ESTERS THEREOF, AND (3) AN N-SUBSTITUTED AMINE SELECTED FROM THE GROUP CONSISTING OF N-ALKYL HYDROXY POLYMETHYLENE AMINES CONTAINING 3-12 CARBON ATOMS WHEREIN THE N-ALKYL GROUP CONTAINS 2-6 CARBON ATOMS, N,N''-DIALKYL POLYMETHYLENE DIAMINES CONTAINING 4-18 CARBON ATOMS WHEREIN EACH ALKYL GROUP CONTAINS 1-6 CARBON ATOMS, AND N,N''-DIARYLPOLYMETHYLENE DIAMINES CONTAINING 14-22 CARBON ATOMS WHEREIN EACH OF SAID ARYL GROUPS CONTAINS 6-8 CARBON ATOMS, SAID POLYESTER CONTAINING 5-20 MOLE PERCENT OF SAID AMINE AND AT LEAST 1.3 TIMES AS MUCH OF SAID COMPOUND (1) AS SAID COMPOUND (2).
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) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |