(19)

(11)

EP 0 432 161 A1

(12)

(43) Date of publication: 19.06.1991 Bulletin 1991/25 (21) Application number: 89907164.0 (22) Date of filing: 03.07.1989

(51) International Patent Classification (IPC):  C08L 71/ 00( . ) C08L 71/ 12( . ) C08L 81/ 02( . ) (86) International application number: PCT/EP1989/000768 (87) International publication number: WO 1990/000577 (25.01.1990 Gazette 1990/03)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 05.07.1988 GB 19880015992 (71) Applicant: T&N TECHNOLOGY LIMITED Cawston Rugby Warwickshire, CV22 7SA (GB)	(72) Inventor: DAVIES, Glyndwr, John Warwickshire (GB) (74) Representative: Hadfield, Robert Franklin, et al  Bowdon House PO Box 20 Ashburton Road West Trafford Park Manchester M17 1RA Manchester M17 1RA (GB)