(19)

(11)

EP 1 070 157 A1

(12)

(43) Date of publication: 24.01.2001 Bulletin 2001/04 (21) Application number: 98915347.3 (22) Date of filing: 06.04.1998

(51) International Patent Classification (IPC)7: C23G 1/02, C11D 1/40 (86) International application number: PCT/US9806/907 (87) International publication number: WO 9951/796 (14.10.1999 Gazette 1999/41)

(84) Designated Contracting States: BE DE FR GB IE IT NL (71) Applicant: Arch Specialty Chemicals, Inc. Norwalk, Connecticut 06856-4500 (US)	(72) Inventors: LEON, Vincent, G. Scottsdale, AZ 85250 (US) HONDA, Kenji Barrington, RI 02806 (US) ROTHGERY, Eugene, F. North Branford, CT 06471 (US) (74) Representative: Bawden, Peter Charles  Bawden & Associates,66a High Street Harpenden,Hertfordshire AL5 2SP Harpenden,Hertfordshire AL5 2SP (GB)