# US 5,710,241 A · Monoanhydride compounds, method of making same and reaction products thereof

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- Number: US 5,710,241 A
- Document ID: US5710241A
- Status: Granted
- Kind: A
- Application number: 08/205,054
- Filed: 1994-03-02
- Granted: 1998-01-20
- Earliest claimed: 1994-03-02
- Assignees: Hoechst Celanese Corporation
- Inventors: Michael Haubs; Paul Foley; Dominick L. Cangiano
- Web page: https://patentgrep.com/patent/US5710241A

## CPC

- C07D 209/48: with oxygen atoms in positions 1 and 3, e.g. phthalimide
- C08G 73/1003: {Preparatory processes}
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

The present invention relates to monoanhydride monomer compounds, methods of making such compounds and reaction products of the monoanhydride-diacid compounds with other monomers. The inventive monomer compounds exhibit selective reactivity, that is, the dianhydride locus is substantially more reactive towards amines than the diacid locus making it possible to sequentially synthesize a new class of materials suitable for membranes, catalytic substrates or any speciality material required for advanced applications.

## Claims

### Claim 1

A method of preparing an imide-anhydride compound comprising:
(a) selectively hydrolyzing an aromatic dianhydride in an organic solvent medium with an amount of water sufficient and under conditions effective to convert at least 50% of said aromatic dianhydride to the corresponding monoanhydride-diacid;
(b) reacting the monoanhydride-diacid medium of step (a) above with a second compound having at least one primary amine functionality to form an amic acid-diacid intermediate; and
(c) dehydrating said intermediate to form an imide-anhydride compound.

### Claim 2 (depends on 1)

The method according to claim 1, wherein said monoanhydride-diacid compound is of the structural formula: ##STR8##

### Claim 3 (depends on 1)

The method according to claim 1, wherein said second compound is ##STR9##

### Claim 4

An imide-anyhride compound of an anhydride reactant having as its predominent anhydride component a monoanhydride-diacid of the structural formula: ##STR10## with at least a second compound having at least one primary amine functionality.

### Claim 5 (depends on 4)

The reaction product according to claim 4, wherein said second compound is ##STR11##