(19)

(11)

EP 0 605 555 A1

(12)

(43) Date of publication: 13.07.1994 Bulletin 1994/28 (21) Application number: 92920230.0 (22) Date of filing: 21.09.1992

(51) International Patent Classification (IPC):  C09D 5/ 08( . ) C23C 22/ 68( . ) C23C 22/ 34( . ) (86) International application number: PCT/EP1992/002187 (87) International publication number: WO 1993/006259 (01.04.1993 Gazette 1993/09)

(84) Designated Contracting States: BE DE ES FR GB IT LU NL SE (30) Priority: 25.09.1991 GB 19910020442 (71) Applicant: Laporte Industries Limited London WC1B 3RA (GB)	(72) Inventors: CLARKE, Neil Warrington Cheshire WA4 2JR (GB) GRUNDY, Stephen George Widnes Cheshire WA8 8RG (GB) (74) Representative: Green, Mark Charles  Urquhart-Dykes & Lord, 91 Wimpole Street London W1M 8AH London W1M 8AH (GB)