(19)

(11)

EP 0 861 308 A1

(12)

(43) Date of publication: 02.09.1998 Bulletin 1998/36 (21) Application number: 97916945.0 (22) Date of filing: 21.03.1997

(51) International Patent Classification (IPC):  B24D 3/ 00( . ) C04B 35/ 111( . ) C09K 3/ 14( . ) C01F 7/ 02( . ) C04B 38/ 00( . ) (86) International application number: PCT/US1997/004718 (87) International publication number: WO 1998/012276 (26.03.1998 Gazette 1998/12)

(84) Designated Contracting States: AT DE ES FR GB IT SE (30) Priority: 18.09.1996 US 19960715672 18.09.1996 US 19960715682 (71) Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY St. Paul, Minnesota 55133-3427 (US)	(72) Inventor: WOOD, William, P. Saint Paul, MN 55133-3427 (US) (74) Representative: VOSSIUS & PARTNER  Siebertstrasse 4 81675 München 81675 München (DE)