Patent US4622285A successfully refreshed from Google Patents.
US4622285A
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Method for manufacturing polyoxazole and polythiazole precursors
Assignee: Siemens AG
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Filing: 1985-03-27
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Granted: 1986-11-11
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Expires: 2005-03-27
Abstract
Abstract Oligomeric and/or polymeric polyoxazole and polythiazole precursors can be prepared with high purity, i.e., especially without chloride, in a simple manner if an aromatic and/or heterocyclic dihydroxy, dialkoxy or diaryloxydiamino compound or a corresponding dithio compound is reacted with a dicarboxylic acid in the presence of a carbodiimide. The precursors prepared in this manner are suitable, for instance, for the manufacture of protection and insulating layers.
Inventors
- 👤 Hellmut Ahne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:27
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/32; C08G73/00; C08G73/06; C08G73/08; C08G73/22; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
42 words
A method for the manufacture of an oligomeric and/or polymeric precursor of a polyoxazole or polythiazole, comprising reacting an aromatic and/or heterocyclic dihydroxy, dialkoxy or diaryloxydiamino compound or a corresponding dithio compound with a dicarboxylic acid in the presence of a carbodiimide.
Claim 2
Independent Claim
42 words
A method for the manufacture of an oligomeric and/or polymeric precursor of a polyoxazole or polythiazole, comprising reacting an aromatic and/or heterocyclic dihydroxy, dialkoxy or diaryloxydiamino compound or a corresponding dithio compound with a dicarboxylic acid in the presence of a carbodiimide.
Claim 3
Dependent Claim
26 words
A method for the manufacture of a polyoxazole precursor according to claim 1 wherein 3,3'-dihydroxy or 3,3'-dimethoxybenzidine is reacted with isophthalic acid or benzophenone dicarboxylic acid.
Claim 4
Dependent Claim
24 words
A method for the preparation of a polythiazole precursor according to claim 1 wherein 3,3'-dimercaptobenzidine is reacted with isophthalic acid or benzophenone dicarboxylic acid.
Claim 5
Dependent Claim
27 words
A method according to claim 1 wherein an olefinically unsaturated monoepoxide is reacted with the polycondensation product of the dihydroxy or dimercaptodiamino compound and the dicarboxylic acid.
Claim 6
Dependent Claim
41 words
A method according to claim 4 wherein the reaction between the polycondensation product and the olefinically unsaturated monoepoxide is carried out at a temperature of from about room temperature to a temperature up to about 100° C. in an organic solvent.
Claim 7
Dependent Claim
12 words
A method according to claim 5 wherein an amine catalyst is present.
Claim 8
Dependent Claim
50 words
A method for the preparation of a protection or insulating layer, which comprises preparing an oligomeric and/or polymeric precursor of a polyoxazole or polythiazole according to claim 1, forming a dried layer of the oligomeric and/or polymeric precursor and annealing the dried layer to produce the protection or insulating layer.
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) | 1989-11-10 | 1990-05-12 | 1990-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-10 | 1994-05-12 | 1994-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-10 | 1998-05-12 | 1998-11-11 | $7700.00 | Window Closed / Lapsed |