(19)

(11)

EP 0 495 858 A1

(12)

(43) Date of publication: 29.07.1992 Bulletin 1992/31 (21) Application number: 90915470.0 (22) Date of filing: 04.10.1990

(51) International Patent Classification (IPC):  C11D 3/ 22( . ) C11D 17/ 00( . ) C11D 3/ 37( . ) (86) International application number: PCT/EP1990/001667 (87) International publication number: WO 1991/005844 (02.05.1991 Gazette 1991/10)

(84) Designated Contracting States: CH DE ES FR GB IT LI NL SE (30) Priority: 12.10.1989 EP 19890202580 07.12.1989 GB 19890027728 (71) Applicants: UNILEVER PLC London EC4P 4BQ (GB) UNILEVER N.V. NL-3000 DK Rotterdam (NL)

(72) Inventors: VAN DE PAS, Johannes, Cornelis NL-3136 CV Vlaardingen (NL) SCHEPERS, Frederik, Jan Unilever Reasearch U.S.Inc Edgwater, NJ 07020 (US) VERHEUL, Rudolf, Cornelis, Stefanus NL-3571 EG Utrecht (NL) Montague, Peter Graham Rugby, Warwickshire, CV22-6QB (GB) (74) Representative: Joppe, Hermina L. P., et al  Unilever N.V. Patent Division P.O. Box 137 NL-3130 AC Vlaardingen NL-3130 AC Vlaardingen (NL)