(19)

(11)

EP 0 971 777 A1

(12)

(43) Date of publication: 19.01.2000 Bulletin 2000/03 (21) Application number: 98915298.8 (22) Date of filing: 03.04.1998

(51) International Patent Classification (IPC)7: B01D 3/34, C07C 27/00, C07C 29/124 (86) International application number: PCT/US9806/760 (87) International publication number: WO 9843/717 (08.10.1998 Gazette 1998/40)

(84) Designated Contracting States: BE DE FR GB IT NL (30) Priority: 03.04.1997 US 43903 P 28.05.1997 US 864139 (71) Applicant: GREAT LAKES CHEMICAL CORPORATION West LafayetteIndiana 47996 (US)	(72) Inventors: DEGROOT, Richard, J. West Lafayette, IN 47906 (US) AYRES, James, T. El Dorado, AR 71730 (US) REINEKE, Karl, E. Lafayette, IN 47905 (US) (74) Representative: Atkinson, Peter Birch  MARKS & CLERK,Sussex House,83-85 Mosley Street Manchester M2 3LG Manchester M2 3LG (GB)