(19)

(11)

EP 0 496 789 A1

(12)

(43) Date of publication: 05.08.1992 Bulletin 1992/32 (21) Application number: 90915681.0 (22) Date of filing: 11.10.1990

(51) International Patent Classification (IPC):  C07C 43/ 16( . ) C08F 16/ 32( . ) C08F 2/ 46( . ) (86) International application number: PCT/US1990/005773 (87) International publication number: WO 1991/005756 (02.05.1991 Gazette 1991/10)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 20.10.1989 US 19890424419 17.11.1989 US 19890437706 (71) Applicant: GAF CHEMICALS CORPORATION Wayne New Jersey 07470 (US)	(72) Inventor: LIU, Kou-Chang Wayne, NJ 07470 (US) (74) Representative: Ford, Michael Frederick, et al  MEWBURN ELLIS York House 23 Kingsway London WC2B 6HP London WC2B 6HP (GB)