(19)

(11)

EP 0 045 745 A1

(12)

(43) Date of publication: 17.02.1982 Bulletin 1982/07 (21) Application number: 80902093.0 (22) Date of filing: 22.09.1980

(51) International Patent Classification (IPC):  C04B 35/ 117( . ) C22C 29/ 12( . ) (86) International application number: PCT/US1980/001264 (87) International publication number: WO 1981/001144 (30.04.1981 Gazette 1981/11)

(84) Designated Contracting States: AT CH DE FR GB LI LU NL SE (30) Priority: 26.10.1979 US 19790088376 (71) Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY St. Paul, Minnesota 55133-3427 (US)	(72) Inventor: LEE, Sang H. St. Paul, MN 55133 (US)