(19)

(11)

EP 0 914 388 A1

(12)

(43) Date of publication: 12.05.1999 Bulletin 1999/19 (21) Application number: 97918787.0 (22) Date of filing: 24.04.1997

(51) International Patent Classification (IPC):  C09C 1/ 42( . ) (86) International application number: PCT/US1997/006797 (87) International publication number: WO 1997/042268 (13.11.1997 Gazette 1997/49)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV RO SI (30) Priority: 08.05.1996 US 19960646901 21.04.1997 US 19970837640 (71) Applicant: Engelhard Corporation Iselin, NJ 08830-0770 (US)	(72) Inventors: MUNSTERMAN, David, H. Shelbyville, KY 40065 (US) SUITCH, Paul, R. Santa Barbara, CA 93103 (US) (74) Representative: Fisher, Adrian John, et al  CARPMAELS & RANSFORD 43 Bloomsbury Square London WC1A 2RA London WC1A 2RA (GB)