(19)

(11)

EP 0 506 744 A1

(12)

(43) Date of publication: 07.10.1992 Bulletin 1992/41 (21) Application number: 91901175.0 (22) Date of filing: 07.12.1990

(51) International Patent Classification (IPC):  C11D 7/ 32( . ) C11D 7/ 50( . ) C11D 3/ 43( . ) (86) International application number: PCT/US1990/007215 (87) International publication number: WO 1991/009104 (27.06.1991 Gazette 1991/14)

(84) Designated Contracting States: BE DE FR GB NL (30) Priority: 19.12.1989 US 19890452623 (71) Applicant: BUCKEYE INTERNATIONAL, INC. Maryland Heights, MO 63043-3471 (US)	(72) Inventor: VANEENAM, Donald, N. Maryland, MO 63043-3471 (US) (74) Representative: Baverstock, Michael George Douglas, et al  BOULT, WADE & TENNANT 27 Furnival Street London, EC4A 1PQ London, EC4A 1PQ (GB)