US4623675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic poly(ether-carbonate) containing ethyleneoxy and arylene oxy moieties
Assignee: Eastman Chemical Co
•
Filing: 1985-07-31
•
Granted: 1986-11-18
•
Expires: 2005-07-31
Abstract
Abstract Disclosed are new poly(ether-carbonates) which may be prepared by heating aromatic diol polycarbonates with ethylene carbonate, optionally in the presence of a suitable catalyst or promoter.
Inventors
- 👤 William R. Darnell
- 👤 Winston J. Jackson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:43
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/18; C08G64/183
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
66 words
A composition of matter comprising a mixture of the following repeating units: ##STR15## wherein a, b, and c are each integers of a magnitude such as to result in an inherent viscosity of about 0.05-2.00 of said composition determined at 25° C. in a 40/36/24 percent by weight mixture of p-chlorophenol/phenol/1,1,2,2-tetrachloroethane at a concentration of 0.1 g/100 mL, and Ar is aryl having 6-30 carbon atoms.
Claim 2
Dependent Claim
66 words
A composition of matter comprising a mixture of the following repeating units: ##STR15## wherein a, b, and c are each integers of a magnitude such as to result in an inherent viscosity of about 0.05-2.00 of said composition determined at 25° C. in a 40/36/24 percent by weight mixture of p-chlorophenol/phenol/1,1,2,2-tetrachloroethane at a concentration of 0.1 g/100 mL, and Ar is aryl having 6-30 carbon atoms.
Claim 3
Dependent Claim
9 words
A foamed structure comprising the composition of claim 1.
Claim 4
Dependent Claim
8 words
A film comprising the composition of claim 1.
Claim 5
Dependent Claim
8 words
A fiber comprising the composition of claim 1.
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) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |