(19)

(11)

EP 0 523 131 A1

(12)

(43) Date of publication: 20.01.1993 Bulletin 1993/03 (21) Application number: 91907294.0 (22) Date of filing: 28.03.1991

(51) International Patent Classification (IPC):  A61K 31/ 79( . ) C08F 26/ 10( . ) (86) International application number: PCT/US1991/002115 (87) International publication number: WO 1991/015522 (17.10.1991 Gazette 1991/24)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI NL SE (30) Priority: 06.04.1990 US 19900505773 12.09.1990 US 19900581382 (71) Applicant: ISP INVESTMENTS INC. Wilmington, Delaware 19801 (US)	(72) Inventors: Tazi, Mohammed Marietta, GA 30064 (US) MANDELLA, William, L. Boonton, NJ 07005 (US) (74) Representative: Ford, Michael Frederick, et al  MEWBURN ELLIS York House 23 Kingsway London WC2B 6HP London WC2B 6HP (GB)