(19)

(11)

EP 0 719 323 A1

(12)

(43) Date of publication: 03.07.1996 Bulletin 1996/27 (21) Application number: 94927331.0 (22) Date of filing: 02.09.1994

(51) International Patent Classification (IPC):  C11D 7/ 26( . ) C11D 7/ 50( . ) C11D 7/ 32( . ) C23G 5/ 032( . ) (86) International application number: PCT/US1994/009954 (87) International publication number: WO 1995/007974 (23.03.1995 Gazette 1995/13)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IE IT LI LU NL SE (30) Priority: 15.09.1993 GB 19930019125 (71) Applicant: THE DOW CHEMICAL COMPANY Midland, Michigan 48640 (US)	(72) Inventors: KUEMIN, Marius, A., M. CH-6331 Huenenberg (CH) SCHNEIDER, Michael CH-8810 Horgen (CH) ALAM, Farooq CH-8805 Richterswil (CH) CHARLES, Nelly, Rence F-69330 Jonage (FR) (74) Representative: Raynor, John, et al  W.H. Beck, Greener & Co 7 Stone Buildings Lincoln's Inn London WC2A 3SZ London WC2A 3SZ (GB)