(19)

(11)

EP 0 504 159 A1

(12)

(43) Date of publication: 23.09.1992 Bulletin 1992/39 (21) Application number: 90916484.0 (22) Date of filing: 12.11.1990

(51) International Patent Classification (IPC):  C11D 3/ 22( . ) C11D 17/ 00( . ) C11D 3/ 37( . ) C11D 17/ 08( . ) (86) International application number: PCT/EP1990/001885 (87) International publication number: WO 1991/009108 (27.06.1991 Gazette 1991/14)

(84) Designated Contracting States: CH DE ES FR GB IT LI NL SE (30) Priority: 07.12.1989 GB 19890027730 04.07.1990 GB 19900014830 (71) Applicants: UNILEVER PLC London EC4P 4BQ (GB) UNILEVER N.V. NL-3000 DK Rotterdam (NL)	(72) Inventors: DAWSON, Peter, Leonard Unilever Research Bebington Wirral Merseyside L63 3JW (GB) VAN DE PAS, Johannes, Cornelis NL-3136 CV Vlaardingen (NL) (74) Representative: Kan, Jacob Hendrik, Dr., et al  Unilever N.V. Patent Division P.O. Box 137 NL-3130 AC Vlaardingen NL-3130 AC Vlaardingen (NL)