(19)

(11)

EP 0 682 717 A1

(12)

(43) Date of publication: 22.11.1995 Bulletin 1995/47 (21) Application number: 94906093.0 (22) Date of filing: 04.02.1994

(51) International Patent Classification (IPC):  C21C 5/ 28( . ) C21C 5/ 36( . ) (86) International application number: PCT/AU1994/000049 (87) International publication number: WO 1994/018347 (18.08.1994 Gazette 1994/19)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 05.02.1993 AU 1993PL07152 (71) Applicant: LAPORTE GROUP AUSTRALIA LIMITED Wetherill Park, NSW 2164 (AU)	(72) Inventors: MARIC, Milena Chifley, NSW 2036 (AU) PYE, Eric Baulkham Hills, NSW 2153 (AU) (74) Representative: Casey, Lindsay Joseph, et al  F. R. Kelly & Co. 27 Clyde Road Ballsbridge Dublin 4 Dublin 4 (IE)