(19)

(11)

EP 0 419 608 A1

(12)

(43) Date of publication: 03.04.1991 Bulletin 1991/14 (21) Application number: 90903864.0 (22) Date of filing: 05.03.1990

(51) International Patent Classification (IPC):  B29C 45/ 16( . ) B29C 45/ 58( . ) B29C 45/ 50( . ) (86) International application number: PCT/GB1990/000333 (87) International publication number: WO 1990/010529 (20.09.1990 Gazette 1990/22)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 06.03.1989 GB 19890005057 (71) Applicant: HOECHST (UK) LIMITED Watford, Hertfordshire WD2 4AP (GB)	(72) Inventor: PERKINS, Derek Michael St. Albans, Hertfordshire AL4 9YG (GB) (74) Representative: Kensett, John Hinton, et al  Saunders & Dolleymore, 9 Rickmansworth Road Watford, Hertfordshire WD1 7HE Watford, Hertfordshire WD1 7HE (GB)