# US 5,705,539 A · Curing polyketones with high energy radiation

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- Number: US 5,705,539 A
- Document ID: US5705539A
- Status: Granted
- Kind: A
- Application number: 08/570,020
- Filed: 1995-12-11
- Granted: 1998-01-06
- Earliest claimed: 1995-12-11
- Assignees: Shell Oil Company
- Inventors: Carl Edwin Ash; Narayana Mysore
- Web page: https://patentgrep.com/patent/US5705539A

## CPC

- B29C 71/04: by wave energy or particle radiation {, e.g. for curing or vulcanising preformed articles (during moulding, e.g. in a mould B29C35/08)}
- C08G 67/02: Copolymers of carbon monoxide and aliphatic unsaturated compounds
- B29C 2035/0844: {using X-ray}
- B29C 2035/085: {using gamma-ray}
- B29C 2035/0872: {using ion-radiation, e.g. alpha-rays}
- B29C 2035/0877: {using electron radiation, e.g. beta-rays}
- B29K 2096/00: Use of specified macromolecular materials not provided for in a single one of main groups B29K2001/00 - B29K2095/00, as moulding material
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS

## Abstract

Polyketone polymers are cured by exposure to high energy radiation. Radiation sources include gamma radiation sources such as Co.sup.60 emitters as well as e-beam, ion and other commercially used sources of high energy radiation. The materials so produced are high molecular weight crosslinked polyketone polymers which exhibit enhanced mechanical and tribological properties.

## Claims

### Claim 1

A method of crosslinking alternating aliphatic polyketone polymer consisting essentially of exposing said polyketone polymer to high energy radiation in the substantial absence of oxygen until said polymer undergoes crosslinking reactions.

### Claim 2 (depends on 1)

The method of claim 1 wherein said polyketone polymer has a specific surface area of less than about 2.19.times.10.sup.-3 m.sup.2 /gm.

### Claim 3 (depends on 2)

The method of claim 2 conducted in air.

### Claim 4 (depends on 1)

The method of claim 1 wherein said polyketone polymer is in the form of a strand or wire.

### Claim 5 (depends on 1)

The method of claim 1 conducted in a substantially inert atmosphere.

### Claim 6 (depends on 5)

The method of claim 5 wherein said atmosphere is created by blanketing said polyketone polymer in nitrogen or a noble gas.

### Claim 7 (depends on 1)

The method of claim 1 wherein said radiation is .gamma.-radiation.

### Claim 8 (depends on 7)

The method of claim 7 comprising between about 1 and 50 mrads of .gamma.-radiation.

### Claim 9 (depends on 7)

The method of claim 7 comprising between about 5 and 20 mrads of .gamma.-radiation.

### Claim 10 (depends on 1)

The method of claim 1 wherein said radiation is electron beam radiation.

### Claim 11 (depends on 1)

The method of claim 1 wherein said radiation is ion beam radiation.