(19)

(11)

EP 0 743 977 A1

(12)

(43) Date of publication: 27.11.1996 Bulletin 1996/48 (21) Application number: 95907745.0 (22) Date of filing: 07.02.1995

(51) International Patent Classification (IPC):  C11D 7/ 12( . ) C11D 11/ 00( . ) C11D 7/ 14( . ) (86) International application number: PCT/GB1995/000245 (87) International publication number: WO 1995/021237 (10.08.1995 Gazette 1995/34)

(84) Designated Contracting States: AT BE DE DK ES FR GB GR IE IT LU NL PT SE (30) Priority: 07.02.1994 GB 19940002301 (71) Applicants: BRUNNER MOND & COMPANY LIMITED Northwich, Cheshire CW8 4DT (GB) COLIN STEWART MINCHEM LTD. Winsford, Cheshire CW7 3BU (GB)	(72) Inventors: THORPE, Malcolm, John Northwich Cheshire CW9 8GG (GB) HUGHES, Philip, George Warrington Cheshire WA5 2AX (GB) McCLELLAN, Alan, Keith Winsford Cheshire CW7 1JE (GB) (74) Representative: Atkinson, Peter Birch, et al  MARKS & CLERK, Sussex House, 83-85 Mosley Street Manchester M2 3LG Manchester M2 3LG (GB)