(19)

(11)

EP 0 912 481 A1

(12)

(43) Date of publication: 06.05.1999 Bulletin 1999/18 (21) Application number: 96920484.0 (22) Date of filing: 24.05.1996

(51) International Patent Classification (IPC):  C07C 49/ 675( . ) (86) International application number: PCT/US1996/007694 (87) International publication number: WO 1997/045393 (04.12.1997 Gazette 1997/52)

(84) Designated Contracting States: AT BE DE FR GB IT NL (71) Applicant: THE DOW CHEMICAL COMPANY Midland, Michigan 48640 (US)	(72) Inventors: WALTERS, Marlin, E. West Columbia, TX 77486 (US) KOLONKO, Richard, P. Lake Jackson, TX 77566 (US) WEHMEYER, Richard, M. Lake Jackson, TX 77566 (US) (74) Representative: Raynor, John, et al  W.H. Beck, Greener & Co 7 Stone Buildings Lincoln's Inn London WC2A 3SZ London WC2A 3SZ (GB)