(19)

(11)

EP 0 935 622 A1

(12)

(43) Date of publication: 18.08.1999 Bulletin 1999/33 (21) Application number: 97919164.0 (22) Date of filing: 16.09.1997

(51) International Patent Classification (IPC):  C08L 39/ 04( . ) C08F 2/ 10( . ) C08F 246/ 00( . ) C08F 2/ 06( . ) C08F 26/ 06( . ) C08L 57/ 00( . ) (86) International application number: PCT/GB1997/002529 (87) International publication number: WO 1998/012239 (26.03.1998 Gazette 1998/12)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU NL PT SE Designated Extension States: LT LV RO (30) Priority: 18.09.1996 GB 19960019419 (71) Applicant: Bradford University Bradford, West Yorkshire, BD7 1DP (GB)	(72) Inventors: EAGLAND, Donald West Yorkshire HD8 0JJ (GB) CROWTHER, Nicholas, John West Yokshire BD13 4LU (GB) (74) Representative: Brierley, Anthony Paul, et al  Appleyard Lees 15 Clare Road Halifax West Yorkshire HX1 2HY Halifax West Yorkshire HX1 2HY (GB)