# US 5,344,914 A · Commercially valuable polymeric ketones and method of preparing same

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- Number: US 5,344,914 A
- Document ID: US5344914A
- Status: Granted
- Kind: A
- Application number: 07/956,743
- Filed: 1992-10-05
- Granted: 1994-09-06
- Earliest claimed: 1992-10-05
- Assignees: Center for Innovative Technology
- Inventors: Harry W. Gibson; Ashish Pandya
- Web page: https://patentgrep.com/patent/US5344914A

## CPC

- C07D 295/145: with the ring nitrogen atoms and the carbon atoms with three bonds to hetero atoms attached to the same carbon chain, which is not interrupted by carbocyclic rings
- C07C 317/24: having sulfone or sulfoxide groups and doubly-bound oxygen atoms bound to the same carbon skeleton
- C08G 61/12: Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

A new method for preparing commercially valuable polymeric ketones is described. The method employs an .alpha.-amiononitrile as a monomeric unit whereby an amorphous, soluble polymer having protected carbonyl moiety is obtained. Upon deprotecting the carbonyl moiety, a crystalline polymeric ketone is obtained. The method allows production of polymeric ketone materials having aromatic, aliphatic or mixed aromatic/aliphatic backbones.

## Claims

### Claim 1

A method of preparing polymers having ketone functionality, comprising the steps of:
forming a dianion from a first monomer having at least one aminonitrile constituent, wherein the amino moiety of the aminonitrile constituent is a secondary amine;
condensing said dianion with a difunctional electrophile to produce a polyaminonitrile; and
acid catalyzing aminonitrile constituents in said polyaminonitrile to produce a polymer having ketone functionality.

### Claim 2

A polymeric material having ketone functionality having the formula: ##STR2## where Ar is selected from the group consisting of: ##STR3##

### Claim 3 (depends on 2)

The polymeric material of claim 2 wherein Ar is: ##STR4##

### Claim 4 (depends on 1)

The method of claim 1 wherein said step of forming a dianion is achieved by reacting said monomer with a base which will remove a hydrogen from said aminonitrile constituent.

### Claim 5 (depends on 2)

The polymeric material of claim 2 wherein Ar is selected from the group consisting of: ##STR5##

### Claim 6 (depends on 2)

The polymeric material of claim 2 wherein Ar is: ##STR6##