(19)

(11)

EP 0 804 531 A1

(12)

(43) Date of publication: 05.11.1997 Bulletin 1997/45 (21) Application number: 96900628.0 (22) Date of filing: 19.01.1996

(51) International Patent Classification (IPC):  C11D 3/ 08( . ) C11D 3/ 33( . ) C11D 3/ 10( . ) (86) International application number: PCT/GB1996/000113 (87) International publication number: WO 1996/022351 (25.07.1996 Gazette 1996/34)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 19.01.1995 GB 19950001047 03.11.1995 GB 19950022532 (71) Applicant: RHONE-POULENC CHEMICALS LIMITED Watford, Herts WD1 1QM (GB)	(72) Inventors: CARR, John, Frederick Gloucester GL4 4XX (GB) DAVIS, Brian Doncaster DN5 7QH (GB) BOITTIAUX, Patrick F-94160 Saint-Mande (FR) JOUBERT, Daniel F-60500 Vineuil-Saint-Firmin (FR) (74) Representative: Ellis-Jones, Patrick George Armine, et al  J.A. KEMP & CO. 14 South Square Gray's Inn London WC1R 5LX London WC1R 5LX (GB)