(19)

(11)

EP 0 465 461 A1

(12)

(43) Date of publication: 15.01.1992 Bulletin 1992/03 (21) Application number: 89909286.0 (22) Date of filing: 01.08.1989

(51) International Patent Classification (IPC):  C11D 3/ 24( . ) C11D 17/ 00( . ) C11D 3/ 37( . ) (86) International application number: PCT/US1989/003313 (87) International publication number: WO 1990/012081 (18.10.1990 Gazette 1990/24)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI NL SE (30) Priority: 31.03.1989 US 19890331695 (71) Applicant: ECOLAB INCORPORATED Saint Paul, MN 55101 (US)	(72) Inventors: BULL, Sandra, L. Eagan, MN 55123 (US) GLADFELTER, Elizabeth, J. Falcon Heights, MN 55113 (US) OLSON, Keith, E. Apple Valley, MN 55124 (US) (74) Representative: Eisenführ, Speiser & Partner  Martinistrasse 24 D-28195 Bremen D-28195 Bremen (DE)