# US 5,344,982 A · Diamines and polyimides containing pendent ethynyl groups

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,344,982 A
- Document ID: US5344982A
- Status: Granted
- Kind: A
- Application number: 08/045,345
- Filed: 1993-04-02
- Granted: 1994-09-06
- Earliest claimed: 1993-04-02
- Assignees: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
- Inventors: Paul M. Hergenrother; Brian J. Jensen
- Web page: https://patentgrep.com/patent/US5344982A

## CPC

- C08G 73/1039: {comprising halogen-containing substituents}
- C07C 211/52: the carbon skeleton being further substituted by halogen atoms or by nitro or nitroso groups
- C09J 179/08: Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)

## Abstract

Diamines containing pendent ethynyl and substituted ethynyl groups are synthesized. These diamines are reacted with dianhydrides to form polyamide acids, which are chemically or thermally cyclodehydrated to form polyimides and copolyimides with pendent ethynyl groups. Upon heating, the pendent ethynyl groups react to form crosslinked resins that are useful as adhesives, composite matrices, coatings, moldings and films.

## Claims

### Claim 1

A diamine having a pendent ethynyl or substituted ethynyl group and having the following structural formula: ##STR10## wherein R is a member selected from the group consisting of hydrogen, alkyl, and phenyl, and R' is a member selected from the group consisting of CH.sub.3 and CF.sub.3.

### Claim 2 (depends on 1)

A diamine according to claim 1, wherein R is hydrogen.

### Claim 3 (depends on 1)

A diamine according to claim 1, wherein R is a butyl group.

### Claim 4 (depends on 1)

A diamine according to claim 1, wherein R is a phenyl group.