(19)

(11)

EP 0 535 015 A1

(12)

(43) Date of publication: 07.04.1993 Bulletin 1993/14 (21) Application number: 91910353.0 (22) Date of filing: 30.05.1991

(51) International Patent Classification (IPC):  A21D 8/ 04( . ) C12N 1/ 04( . ) (86) International application number: PCT/AU1991/000234 (87) International publication number: WO 1991/018513 (12.12.1991 Gazette 1991/28)

(84) Designated Contracting States: DE ES FR GB IT (30) Priority: 30.05.1990 AU 19900000381 (71) Applicant: ICI AUSTRALIA OPERATIONS PROPRIETARY LIMITED Melbourne Victoria 3000 (AU)	(72) Inventors: JOHNSTON, Michael Melton, VIC 3337 (AU) LOMBARD, Anne Rosanna, VIC 3084 (AU) (74) Representative: Pugsley, Roger Graham  ICI Group Patents Services Dept. P.O. Box 6 Shire Park Bessemer Road Welwyn Garden City Herts, AL7 1HD Welwyn Garden City Herts, AL7 1HD (GB)