(19)

(11)

EP 0 885 286 A1

(12)

(43) Date of publication: 23.12.1998 Bulletin 1998/52 (21) Application number: 97907919.0 (22) Date of filing: 26.02.1997

(51) International Patent Classification (IPC):  C11D 7/ 50( . ) C11D 7/ 26( . ) C11D 7/ 32( . ) C23G 5/ 028( . ) C11D 7/ 28( . ) (86) International application number: PCT/US1997/003086 (87) International publication number: WO 1997/032964 (12.09.1997 Gazette 1997/39)

(84) Designated Contracting States: BE CH DE FR GB IT LI (30) Priority: 04.03.1996 US 19960610016 (71) Applicant: ALBEMARLE CORPORATION Baton Rouge Louisiana 70801 (US)	(72) Inventors: RIDDLE, James, M. Baton Rouge, LA 70815 (US) LEE, Burnell Naperville, IL 60565 (US) (74) Representative: UEXKÜLL & STOLBERG  Patentanwälte Beselerstrasse 4 22607 Hamburg 22607 Hamburg (DE)