(19)

(11)

EP 0 559 693 A1

(12)

(43) Date of publication: 15.09.1993 Bulletin 1993/37 (21) Application number: 91920387.0 (22) Date of filing: 26.11.1991

(51) International Patent Classification (IPC):  C11D 1/ 22( . ) C11D 17/ 00( . ) C11D 1/ 52( . ) C11D 1/ 83( . ) C11D 1/ 14( . ) C11D 1/ 72( . ) (86) International application number: PCT/GB1991/002083 (87) International publication number: WO 1992/009677 (11.06.1992 Gazette 1992/13)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 26.11.1990 GB 19900025691 (71) Applicant: S.B. CHEMICALS LIMITED Lisburn, Antrim BT27 5QB (GB)	(72) Inventors: HALL, Sean, Geoffrey Grove Hill 13 Dromore Road Co. Down BT26 8HS (GB) McCULLINS, John, Thomas Belfast BT6 0NJ (GB) (74) Representative: W.P. THOMPSON & CO.  Celcon House 289-293 High Holborn London WC1V 7HU London WC1V 7HU (GB)