(19)

(11)

EP 0 521 863 A1

(12)

(43) Date of publication: 13.01.1993 Bulletin 1993/02 (21) Application number: 91904091.0 (22) Date of filing: 14.02.1991

(51) International Patent Classification (IPC):  C11D 1/ 72( . ) C11D 17/ 00( . ) C11D 1/ 825( . ) C11D 1/ 722( . ) (86) International application number: PCT/EP1991/000295 (87) International publication number: WO 1991/014765 (03.10.1991 Gazette 1991/23)

(84) Designated Contracting States: CH DE ES FR GB IT LI NL SE (30) Priority: 28.03.1990 EP 19900200745 (71) Applicants: UNILEVER PLC London EC4P 4BQ (GB) UNILEVER N.V. NL-3000 DK Rotterdam (NL)	(72) Inventor: DONKER, Cornelis, Bernard, Jellicoe Drive Merseyside L48 2LF (GB) (74) Representative: Tan, Bian An, Ir.  Unilever N.V. Patent Division P.O. Box 137 NL-3130 AC Vlaardingen NL-3130 AC Vlaardingen (NL)