# US 4,398,009 A · Polyoxazole precursor and the preparation thereof

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- Number: US 4,398,009 A
- Document ID: US4398009A
- Status: Granted
- Kind: A
- Application number: 06/179,462
- Filed: 1980-08-19
- Granted: 1983-08-09
- Earliest claimed: 1979-08-21
- Assignees: Siemens Aktiengesellschaft
- Inventors: Hellmut Ahne; Eberhard Kuhn; Roland Rubner
- Web page: https://patentgrep.com/patent/US4398009A

## CPC

- G03F 7/0387: {Polyamides or polyimides}
- C08G 73/0233: {Polyamines derived from (poly)oxazolines, (poly)oxazines or having pendant acyl groups}
- Y10T 428/2933: Coated or with bond, impregnation or core
- Y10T 428/31511: Of epoxy ether
- Y10T 428/31725: Of polyamide
- G03F: PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR; (phototypographic composing devices B41B; photosensitive materials or processes for photographic purposes G03C; electrophotography, sensitive layers or processes therefor G03G)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## 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.

## Claims

### Claim 1

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 (depends on 1)

The polyoxazole precursor according to claim 1 wherein said unsaturated 1,2-monoepoxide comprises a member selected from glycidyl acrylate or glycidyl methacrylate.

### Claim 3 (depends on 1)

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 4

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.degree. C.

### Claim 5 (depends on 4)

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 6 (depends on 1)

A plastic coating for the optical fibers of a light waveguide comprised of the polymer precursor stage of claim 1.