(19)

(11)

EP 0 879 221 A1

(12)

(43) Date of publication: 25.11.1998 Bulletin 1998/48 (21) Application number: 97900351.0 (22) Date of filing: 15.01.1997

(51) International Patent Classification (IPC):  B01D 53/ 86( . ) F23G 7/ 06( . ) C07C 51/ 265( . ) F23G 7/ 07( . ) (86) International application number: PCT/GB1997/000104 (87) International publication number: WO 1997/027168 (31.07.1997 Gazette 1997/33)

(84) Designated Contracting States: BE DE ES FR GB IE IT NL SE (30) Priority: 25.01.1996 GB 19960001493 01.02.1996 GB 19960002050 07.02.1996 GB 19960002458 28.05.1996 WO 1996GB01261 02.10.1996 GB 19960020494 04.10.1996 US 19960027784P (71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY Wilmington Delaware 19898 (US)	(72) Inventors: JEFFERY, Ian Charles Stockton-on-Tees, Cleveland TS20 1LP (GB) TURNER, John Arthur Middlesbrough, Cleveland TS6 0SW (GB) (74) Representative: Jones, Alan John, et al  CARPMAELS & RANSFORD 43 Bloomsbury Square London, WC1A 2RA London, WC1A 2RA (GB)