US4398009A
Expired / Lapsed
US
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Polyoxazole precursor and the preparation thereof
Assignee: Siemens AG
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Filing: 1980-08-19
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Granted: 1983-08-09
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Expires: 2000-08-19
Abstract
Abstract The invention relates to oligomeric and/or polymeric precursor stages of polyoxazoles, as well as to a method for the preparation of these precursor stages. New radiation-reactive polymer precursor stages are provided comprised of addition products of olefinically unsaturated monoepoxides on hydroxyl group-containing polycondensation products of aromatic and/or heterocyclic dihydroxy diamino compounds with dicarboxylic-acid chlorides or esters. The radiation-reactive precursor stages according to the invention are suitable, for example, for the preparation of highly heat-resistant relief structures and as coatings for the optical fibers of light waveguides.
Inventors
- 👤 Hellmut Ahne
- 👤 Eberhard Kuhn
- 👤 Roland Rubner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:17
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/038; G03F7/0387; C; C08; C08G; C08G73/00; C08G73/02; C08G73/0233; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/31504; Y10T428/31511; Y10T428/31725
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
72 words
A polyoxazole precursor selected from the group consisting of an oligomeric and a polymeric precursor comprising the addition product of (a) an olefinically unsaturated 1,2-monoepoxide and (b) an hydroxyl group-containing polycondensation product of (1) a member selected from the group consisting of an aromatic dihydroxydiamino compound and a heterocyclic dihydroxydiamino compound with (2) a member selected from the group consisting of a dicarboxylic acid chloride and an ester of a dicarboxylic acid.
Claim 2
Dependent Claim
72 words
A polyoxazole precursor selected from the group consisting of an oligomeric and a polymeric precursor comprising the addition product of (a) an olefinically unsaturated 1,2-monoepoxide and (b) an hydroxyl group-containing polycondensation product of (1) a member selected from the group consisting of an aromatic dihydroxydiamino compound and a heterocyclic dihydroxydiamino compound with (2) a member selected from the group consisting of a dicarboxylic acid chloride and an ester of a dicarboxylic acid.
Claim 3
Dependent Claim
21 words
The polyoxazole precursor according to claim 1 wherein said unsaturated 1,2-monoepoxide comprises a member selected from glycidyl acrylate or glycidyl methacrylate.
Claim 4
Dependent Claim
28 words
The polyoxazole precursor according to claim 1 wherein said polycondensation product comprises the polycondensation product of 3,3'-dihydroxybenzidine and a member selected from isophthalic-acid dichloride or benzophenone dicarboxylic-acid dichloride.
Claim 5
Independent Claim
76 words
A method for the preparation of a polyoxazole precursor comprising reacting (1) a member selected from the group consisting of an aromatic dihydroxydiamino compound and a heterocyclic dihydroxydiamino compound with (2) a member selected from a dicarboxylic acid chloride and an ester of a dicarboxylic acid to form a hydroxyl group-containing polycondensation product, and reacting said polycondensation product with an olefinically unsaturated 1,2-monoepoxide in an organic solvent at a temperature of up to about 100° C.
Claim 6
Independent Claim
76 words
A method for the preparation of a polyoxazole precursor comprising reacting (1) a member selected from the group consisting of an aromatic dihydroxydiamino compound and a heterocyclic dihydroxydiamino compound with (2) a member selected from a dicarboxylic acid chloride and an ester of a dicarboxylic acid to form a hydroxyl group-containing polycondensation product, and reacting said polycondensation product with an olefinically unsaturated 1,2-monoepoxide in an organic solvent at a temperature of up to about 100° C.
Claim 7
Dependent Claim
27 words
The method according to claim 4 wherein said reaction between the polycondensation product and the 1,2-monoepoxide is conducted in the presence of an amine as a catalyst.
Claim 8
Dependent Claim
20 words
A plastic coating for the optical fibers of a light waveguide comprised of the polymer precursor stage of claim 1.
References Cited (Backward Citations)
US3957512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |