(19)

(11)

EP 1 080 051 A1

(12)

(43) Date of publication: 07.03.2001 Bulletin 2001/10 (21) Application number: 99918114.2 (22) Date of filing: 20.04.1999

(51) International Patent Classification (IPC)7: C04B 28/14, C04B 40/00 // (C04B28/14, 14:10), C04B24:38,(C04B28/14, 14:10), C04B24:26,(C04B28/14, 14:10), C04B14:32 (86) International application number: PCT/GB9901/198 (87) International publication number: WO 9954/265 (28.10.1999 Gazette 1999/43)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE (30) Priority: 20.04.1998 GB 9808339 (71) Applicant: BPB plc Slough,Buckinghamshire SL1 3UF (GB)	(72) Inventors: LUCHKEVICH, Lydia Mississauga, Ontario L5K 1B3 (CA) MAYER, Peter Mississauga, Ontario L5J 1K4 (CA) DAVIES, Jason Milford Haven,Pembrokeshire SA7 3UD (GB) (74) Representative: Marlow, Nicholas Simon  Reddie & Grose16, Theobalds Road London WC1X 8PL London WC1X 8PL (GB)