(19)

(11)

EP 0 820 315 A1

(12)

(43) Date of publication: 28.01.1998 Bulletin 1998/05 (21) Application number: 96912714.0 (22) Date of filing: 12.04.1996

(51) International Patent Classification (IPC):  A61L 26/ 00( . ) C07F 7/ 18( . ) A61L 27/ 28( . ) (86) International application number: PCT/US1996/005079 (87) International publication number: WO 1996/032970 (24.10.1996 Gazette 1996/47)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 13.04.1995 GB 19950007910 (71) Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY St. Paul, Minnesota 55133-3427 (US)	(72) Inventors: NORMAN, Colin, F. Austin, TX 78746 (US) SWAN, Micheal, D. Maplewood, MN 55109 (US) BOTTOMLEY, William, E. Great Dunmow, Essex CM6 1BY (GB) (74) Representative: Bowman, Paul Alan, et al  LLOYD WISE, TREGEAR & CO., Commonwealth House, 1-19 New Oxford Street London WC1A 1LW London WC1A 1LW (GB)