# US 4,397,999 A · Polyimidazole and polyimidazopyrrolone precursor stages and the preparation thereof

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- Number: US 4,397,999 A
- Document ID: US4397999A
- Status: Granted
- Kind: A
- Application number: 06/179,455
- 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/US4397999A

## CPC

- C08G 73/18: Polybenzimidazoles
- C08G 73/20: Pyrrones
- G03F 7/0387: {Polyamides or polyimides}
- Y10T 428/31504: Composite [nonstructural laminate]
- Y10T 428/31511: Of epoxy ether
- Y10T 428/31725: Of polyamide
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The present invention relates to oligomeric and/or polymeric precursor stages of polyimidazoles and polyimidazopyrrolones, as well as to a method for preparing these new precursor stages. The invention provides addition products of olefinically unsaturated monoepoxides on amino group-containing polycondensation products of aromatic and/or heterocyclic tetraamino compounds with dicarboxylic-acid chlorides or esters or on amino group-containing polyaddition products of the tetraamino compounds and tetracarboxylic-acid dianhydrides. The radiation-reactive precursor stages according to the invention are suited, for example, for the preparation of highly heat-resistant relief structures.

## Claims

### Claim 1

A polymeric polyimidazole precursor comprising the reaction product of (a) an olefinically unsaturated 1,2-monoepoxide and (b) an amino group-containing polycondensation product of (1) a member selected from the group consisting of an aromatic tetraamino compound and a heterocyclic tetraamino compound and (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 polyimidazole precursor according to claim 1 wherein the unsaturated monoepoxide is selected from the group consisting of glycidyl acrylate and glycidyl methacrylate.

### Claim 3 (depends on 1)

The polyimidazole precursor according to claim 1 wherein said amino group-containing polycondensation product is the polycondensation product of diaminobenzidine and isophthalic-acid dimethyl ester.

### Claim 4

A method for the preparation of a polyimidazole precursor comprising reacting (1) a member selected from the group consisting of an aromatic tetraamino compound and a heterocyclic tetraamino compound with (2) a member selected from the group consisting of a dicarboxylic acid chloride and an ester of a dicarboxylic acid to form an amino group-containing reaction product; and reacting said amino group-containing reaction product with an olefinically unsaturated 1,2-monoepoxide in an organic solvent at a temperature in the range of from about room temperature to a temperature of up to about 100.degree. C.

### Claim 5 (depends on 1)

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