(19)

(11)

EP 0 593 544 A1

(12)

(43) Date of publication: 27.04.1994 Bulletin 1994/17 (21) Application number: 92913711.0 (22) Date of filing: 01.07.1992

(51) International Patent Classification (IPC):  B01D 19/ 04( . ) C11D 3/ 37( . ) C11D 3/ 00( . ) C11D 17/ 00( . ) (86) International application number: PCT/GB1992/001188 (87) International publication number: WO 1993/001269 (21.01.1993 Gazette 1993/03)

(84) Designated Contracting States: CH DE ES FR GB IT LI NL SE (30) Priority: 01.07.1991 GB 19910014195 (71) Applicants: UNILEVER PLC London EC4P 4BQ (GB) UNILEVER N.V. NL-3013 AL Rotterdam (NL)	(72) Inventors: AKAY, Galip Sidmouth, Devon EX10 8SU (GB) GARRETT, Peter Robert Mold, Clwyd, Wales CH7 5NL (GB) YORKE, John William Harold Little Neston, South Wirral L64 4DL (GB) (74) Representative: Ford, Michael Frederick, et al  MEWBURN ELLIS York House 23 Kingsway London WC2B 6HP London WC2B 6HP (GB)