(19)

(11)

EP 0 675 759 A1

(12)

(43) Date of publication: 11.10.1995 Bulletin 1995/41 (21) Application number: 94902553.0 (22) Date of filing: 17.12.1993

(51) International Patent Classification (IPC):  B01J 2/ 00( . ) C11D 11/ 00( . ) B01J 2/ 28( . ) C11D 17/ 06( . ) (86) International application number: PCT/AU1993/000662 (87) International publication number: WO 1994/014529 (07.07.1994 Gazette 1994/15)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 23.12.1992 AU 1992PL06559 (71) Applicant: ICI AUSTRALIA OPERATIONS PROPRIETARY LIMITED Melbourne Victoria 3000 (AU)	(72) Inventors: PARRIS, David Parkville, VIC 3052 (AU) BAJRASZEWSKI, Michael, Anthony Ferntree Gully, VIC 3156 (AU) (74) Representative: Roberts, Jonathan Winstanley, et al  Intellectual Property Department ICI Chemicals & Polymers Ltd P.O. Box 11 The Heath Runcorn Cheshire WA7 4QE Runcorn Cheshire WA7 4QE (GB)