(19)

(11)

EP 0 314 688 A1

(12)

(43) Date of publication: 10.05.1989 Bulletin 1989/19 (21) Application number: 87904371.0 (22) Date of filing: 02.07.1987

(51) International Patent Classification (IPC):  G01N 27/ 28( . ) G01N 27/ 49( . ) G01N 27/ 30( . ) (86) International application number: PCT/AU1987/000195 (87) International publication number: WO 1988/000342 (14.01.1988 Gazette 1988/02)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 04.07.1986 AU 19860006749 (71) Applicant: ICI AUSTRALIA OPERATIONS PROPRIETARY LIMITED Melbourne Victoria 3000 (AU)	(72) Inventors: BIXLER, John, Wilson Brockport, N.Y. 14420 (US) BOND, Alan, Maxwell Toorak, VIC 3142 (AU) (74) Representative: Bannerman, David Gardner  Withers & Rogers 4 Dyer's Buildings Holborn London, EC1N 2JT London, EC1N 2JT (GB)