US4246393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of poly(thio)hydantoins
Assignee: Bayer AG
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Filing: 1978-11-08
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Granted: 1981-01-20
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Expires: 1998-11-08
Abstract
Abstract A process for the preparation of a poly(thio)hydantoin, which comprises reacting an organic isocyanate or isothiocyanate having two or more isocyanate or isothiocyanate moieties with an unsaturated dicarboxylic acid of the formula: ##STR1## at a temperature of from -20° C. to +500° C., wherein R 1 and R 2 are hydrogen, halogen, substituted or unsubstituted aliphatic, aliphatic-aromatic, aromatic or heterocyclic.
Inventors
- 👤 Wilfried Zecher
- 👤 Jurgen Lewalter
- 👤 Rudolf Merten
- 👤 Willi Dunwald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:30
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/54; C07D233/66; C07D233/72; C07D233/76; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/675; C08G18/6755; C08G73/00; C08G73/06; C08G73/0605; C08G73/0616
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
60 words
A process for the preparation of a poly(thio)hydantoin, which comprises reacting an organic isocyanate or isothiocyanate having two or more isocyanate or isothiocyanate moieties with an unsaturated dicarboxylic acid of the formula: ##STR7## at a temperature of from -20° C. to +500° C., wherein R 1 and R 2 are hydrogen, halogen, substituted or unsubstituted aliphatic, aliphatic-aromatic, aromatic or heterocyclic.
Claim 2
Dependent Claim
60 words
A process for the preparation of a poly(thio)hydantoin, which comprises reacting an organic isocyanate or isothiocyanate having two or more isocyanate or isothiocyanate moieties with an unsaturated dicarboxylic acid of the formula: ##STR7## at a temperature of from -20° C. to +500° C., wherein R 1 and R 2 are hydrogen, halogen, substituted or unsubstituted aliphatic, aliphatic-aromatic, aromatic or heterocyclic.
Claim 3
Dependent Claim
53 words
A process as claimed in claim 1, wherein the isocyanate or isothiocyanate corresponds to the formula: R.sub.3 (NCQ).sub.n wherein R 3 is as substituted or unsubstituted aliphatic, aliphatic-aromatic, aromatic, or heterocyclic, n is the valency of R 3 and is an integer of from 2 to 4, and Q is oxygen or sulphur.
Claim 4
Dependent Claim
149 words
A process as claimed in claim 1, wherein R 1 , R 2 and R 3 are the same or different and are hydrogen, halogen, an aliphatic C 1 -C 20 group, an aliphatic-aromatic C 7 -C 20 group, an aromatic C 6 -C 20 group or a heterocyclic group with 5 to 16 ring members and at least one N, O, or S atom in the ring and R 3 represents an alkyl group with 2 to 20 C-Atoms, all of which may be substituted, C 1 -C 10 alkyl groups and/or C 6 -C 12 ; an aryl group with 5 to 12 C-atoms; a cycloalkyl group with 5 to 12 C-atoms; and alkyl aryl group with 6 to 20 C-atoms; and an aryl or cycloalkyl group with 5 to 12 C-atoms containing hereto atoms such as N, O or S, with halogen or with aryl groups.
Claim 5
Dependent Claim
24 words
A process as claimed in claim 1, wherein at least 2 vals of isocyanate or isothiocyanate are reacted per mole of unsaturated dicarboxylic acid.
Claim 6
Dependent Claim
22 words
A process as claimed in claim 4, wherein 3 to 6 Vals of iso(thio)cyanate are reacted per mole of unsaturated dicarboxylic acid.
Claim 7
Dependent Claim
18 words
A process as claimed in claim 1, wherein the unsaturated dicarboxylic acid is maleic acid and/or fumaric acid.
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) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |