(19)

(11)

EP 1 333 929 A1

(12)

(43) Date of publication: 13.08.2003 Bulletin 2003/33 (21) Application number: 01982610.6 (22) Date of filing: 13.11.2001

(51) International Patent Classification (IPC)7: B02C 17/16, B02C 17/20 (86) International application number: PCT/GB0105/006 (87) International publication number: WO 0203/8274 (16.05.2002 Gazette 2002/20)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 13.11.2000 GB 0027659 (71) Applicant: Imerys Minerals Limited St. AustellCornwall PL25 4DJ (GB)	(72) Inventor: PEARCE, David Anthony Bodmin,Cornwall PL31 2PD (GB) (74) Representative: Giles, Ashley Simon  Haseltine Lake & Co.,Imperial House,15-19 Kingsway London WC2B 6UD London WC2B 6UD (GB)