US4192940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters which can be prepared by reacting a carbonic acid aryl ester with a polyester prepared from a polyhydric alcohol and a polybasic carboxylic acid which is aliphatic
Assignee: Bayer AG
•
Filing: 1978-07-14
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Granted: 1980-03-11
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Expires: 1998-07-14
Abstract
Abstract Polyesters containing carbonate groups and consisting of repeating structural units corresponding to the general formula ##STR1## in which X is the residue of a reaction product of a polyhydric alcohol with a polybasic aliphatic carboxylic acid having a molecular weight of from 800 to 3500, X' has the same meaning as X or represents the residue of an aliphatic polyether having a molecular weight of from 800 to 3500, n=0 or 1 to 10 and m=is a number >20, the intrinsic viscosity in tetrahydrofuran being from 0.8 to 2.5 dl/g.
Inventors
- 👤 Christian Lindner
- 👤 Carlhans Suling
- 👤 Herbert Bartl
- 👤 Dietrich Hardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:45
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64; C08G63/66
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
A polyester containing carbonate groups and consisting of repeating structural units corresponding to the general formula (I): ##STR4## in which X is the residue of a hydroxy terminated reaction product of at least one polyhydric alcohol with a polybasic, aliphatic carboxylic acid having a molecular weight of from 800 to 3500 or with an anhydride or ester of the acid, or a mixture thereof X' has the same meaning as X or X' is the residue of an hydroxy terminated aliphatic polyether having a molecular weight of from 800 to 3500, n=0 or 1 to 10 and m is a number >20, having an intrinsic viscosity in tetrahydrofuran of from 0.8 to 2.5 (dl/g).
Claim 2
Dependent Claim
114 words
A polyester containing carbonate groups and consisting of repeating structural units corresponding to the general formula (I): ##STR4## in which X is the residue of a hydroxy terminated reaction product of at least one polyhydric alcohol with a polybasic, aliphatic carboxylic acid having a molecular weight of from 800 to 3500 or with an anhydride or ester of the acid, or a mixture thereof X' has the same meaning as X or X' is the residue of an hydroxy terminated aliphatic polyether having a molecular weight of from 800 to 3500, n=0 or 1 to 10 and m is a number >20, having an intrinsic viscosity in tetrahydrofuran of from 0.8 to 2.5 (dl/g).
Claim 3
Dependent Claim
15 words
A polyester as claimed in claim 1, wherein the polybasic, aliphatic carboxylic acid is acyclic.
Claim 4
Dependent Claim
46 words
A process for preparing a polyester containing carbonate groups as claimed in claim 1 which comprises reacting a compound having a molecular weight of from 800 to 3500 of the formula HO--X--OH where X is as defined in claim 1 with a carbonic acid diaryl ester.
Claim 5
Dependent Claim
49 words
A process as claimed in claim 3, wherein the carbonic acid diaryl ester has the general formula II ##STR5## wherein Ar is a substituted or unsubstituted aryl radical containing 6 to 18 carbon atoms, n=0 or 1 to 10, and X' is the residue of a polyester or polyether.
Claim 6
Dependent Claim
22 words
A process as claimed in claim 3 or 4, wherein the reaction is carried out in the presence of a transesterification catalyst.
Claim 7
Dependent Claim
30 words
A process as claimed in claim 5, wherein the catalyst is used in a quantity of from 20 to 200 ppm based on the total weight of the polycondensation reactants.
Claim 8
Dependent Claim
19 words
A process as claimed in claim 3, wherein the reaction is carried out in the absence of a solvent.
References Cited (Backward Citations)
US3553167A
Cited
US3444141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |