(19)

(11)

EP 0 543 897 A1

(12)

(43) Date of publication: 02.06.1993 Bulletin 1993/22 (21) Application number: 91915011.0 (22) Date of filing: 14.08.1991

(51) International Patent Classification (IPC):  C08F 2/ 00( . ) C08F 2/ 22( . ) C09J 7/ 02( . ) C08F 2/ 18( . ) C08F 2/ 46( . ) C09J 133/ 00( . ) (86) International application number: PCT/GB1991/001381 (87) International publication number: WO 1992/003481 (05.03.1992 Gazette 1992/06)

(84) Designated Contracting States: AT BE CH DE ES FR GB IT LI NL SE (30) Priority: 14.08.1990 GB 19900017754 (71) Applicant: BRITISH TECHNOLOGY GROUP LTD London SE1 6BU (GB)	(72) Inventors: DAVIDSON, Robert, Stephen London N1 6LD (GB) ALLEN, Keith, William Newbury Berkshire RG14 6JT (GB) ZHANG, Hong, Sheng Department of Chemistry London EC1V 0HB (GB) (74) Representative: Percy, Richard Keith  Patents Department British Technology Group Ltd 101 Newington Causeway London SE1 6BU London SE1 6BU (GB)