(19)

(11)

EP 0 652 940 A1

(12)

(43) Date of publication: 17.05.1995 Bulletin 1995/20 (21) Application number: 93917976.0 (22) Date of filing: 03.08.1993

(51) International Patent Classification (IPC):  C11D 1/ 72( . ) C11D 3/ 20( . ) C11D 17/ 00( . ) C11D 3/ 06( . ) C11D 3/ 395( . ) (86) International application number: PCT/GB1993/001636 (87) International publication number: WO 1994/003580 (17.02.1994 Gazette 1994/05)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 03.08.1992 GB 19920016454 (71) Applicant: IMPERIAL CHEMICAL INDUSTRIES PLC London SW1P 3JF (GB)	(72) Inventor: SWALES, James 4 Orchard Road Cleveland TS19 7DA (GB) (74) Representative: Roberts, Jonathan Winstanley, et al  Intellectual Property Department ICI Chemicals & Polymers Ltd P.O. Box 11 The Heath Runcorn Cheshire WA7 4QE Runcorn Cheshire WA7 4QE (GB)