US4124568A
Expired / Lapsed
US
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Polycondensates
Assignee: Bayer AG
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Filing: 1977-11-23
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Granted: 1978-11-07
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Expires: 1997-11-23
Abstract
Abstract A process for the production of polycondensates linked by nitrogen containing five membered rings, wherein a unsaturated cyclic anhydride compound is polycondensed with alcohols and organic polyisocyanates.
Inventors
- 👤 Wilfried Zecher
- 👤 Willi Dunwald
- 👤 Rudolf Merten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:00
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1035; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/675; C08G18/6755; C08G73/12; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306; H02; H02J; H02J7/00; H02J7/02; H02J2207/00; H02J2207/20; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
65 words
Processes for the production of a polycondensate linked through five membered nitrogen containing rings, wherein unsaturated cyclic carboxylic acid anhydride compounds corresponding to the general formula: ##STR6## in which R 1 represents a mono-unsaturated organic radical, is reacted with a monofunctional or polyfunctional aliphatic, aliphatic-aromatic or aromatic alcohol and a polyfunctional organic isocyanate at a temperature in the range from 0° C. to 500° C.
Claim 2
Dependent Claim
65 words
Processes for the production of a polycondensate linked through five membered nitrogen containing rings, wherein unsaturated cyclic carboxylic acid anhydride compounds corresponding to the general formula: ##STR6## in which R 1 represents a mono-unsaturated organic radical, is reacted with a monofunctional or polyfunctional aliphatic, aliphatic-aromatic or aromatic alcohol and a polyfunctional organic isocyanate at a temperature in the range from 0° C. to 500° C.
Claim 3
Dependent Claim
25 words
Processes as claimed in claim 1, wherein the reaction is carried out at a temperature in the range of from 30° C. to 400° C.
Claim 4
Dependent Claim
84 words
Processes as claimed in claim 1, wherein the alcohol is a compound of the general formula R.sub.5 (OH).sub.n in which R 5 represents an aliphatic radical containing from 1 to 20 carbon atoms, an aliphatic-aromatic radical containing from 7 to 12 carbon atoms, an aromatic radical containing from 6 to 12 carbon atoms, a cycloaliphatic radical containing from 5 to 10 carbon atoms or the residue of a polyether, polyester, polyurea, polyurethane, polyimide or polyhydantoin and n is an integer from 1 to 3.
Claim 5
Dependent Claim
13 words
Processes as claimed in claim 3, wherein the alcohol is an aliphatic diol.
Claim 6
Dependent Claim
24 words
Processes as claimed in claim 1, wherein in the general formula R 1 represents a mono-unsaturated aliphatic radical with C 2 -C 10 .
Claim 7
Dependent Claim
28 words
Processes as claimed in claim 1 wherein the unsaturated cyclic carboxylic acid anhydride is the anhydride of maleic acid, dimethyl- or dichloro-maleic acid, citraconic acid or itaconic acid.
Claim 8
Dependent Claim
35 words
Processes as claimed in claim 1, wherein in a first step, the polyisocyanate is reacted with the alcohol to form a carbamic ester which, in a second step, is subsequently reacted with the acid anhydride.
Claim 9
Dependent Claim
30 words
Processes as claimed in claim 1, wherein, in a first step, the acid anhydride is reacted with the alcohol to form a semiester which is subsequently reacted with the polyisocyanate.
Claim 10
Dependent Claim
25 words
Processes as claimed in claim 1, wherein the polycondensation reaction is carried out in the presence of an organic polycarboxylic acid and an aliphatic polyol.
Claim 11
Dependent Claim
23 words
Processes as claimed in claim 1, wherein the polycondensation reaction is carried out in the presence of a saturated cyclic carboxylic acid anhydride.
Claim 12
Dependent Claim
9 words
Polycondensates obtained by a process claimed in claim 1.
Claim 13
Dependent Claim
11 words
A wire insulated with a polycondensate as claimed in claim 11.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |