(19)

(11)

EP 0 764 227 A1

(12)

(43) Date of publication: 26.03.1997 Bulletin 1997/13 (21) Application number: 95915606.0 (22) Date of filing: 06.04.1995

(51) International Patent Classification (IPC):  D21F 1/ 30( . ) D21F 7/ 08( . ) D21F 1/ 32( . ) (86) International application number: PCT/US1995/004334 (87) International publication number: WO 1995/029292 (02.11.1995 Gazette 1995/47)

(84) Designated Contracting States: AT BE DE DK ES FR GB IT NL PT SE (30) Priority: 21.04.1994 US 19940230985 (71) Applicant: Betzdearborn Inc. Trevose, PA 19053-6783 (US)	(72) Inventors: DUFFY, Robert, James Acasusso, Provincia Buenos Aires (AR) KERSHAW, Philip Warrington, Cheshire WA 5OL (GB) (74) Representative: W.P. Thompson & Co.  Coopers Building, Church Street Liverpool L1 3AB Liverpool L1 3AB (GB)