(19)

(11)

EP 0 356 447 A1

(12)

(43) Date of publication: 07.03.1990 Bulletin 1990/10 (21) Application number: 88903301.0 (22) Date of filing: 14.04.1988

(51) International Patent Classification (IPC):  C09K 3/ 18( . ) (86) International application number: PCT/GB1988/000285 (87) International publication number: WO 1988/008018 (20.10.1988 Gazette 1988/23)

(84) Designated Contracting States: CH DE FR LI SE (30) Priority: 14.04.1987 GB 19870008876 (71) Applicant: QMC Industrial Research Limited London E1 4NS (GB)	(72) Inventors: ANDREWS, Edgar, Harold Hertfordshire AL6 OER (GB) LOCKINGTON, Norman, Anthony Loughton, Essex IG10 4QV (GB) (74) Representative: Day, Jeremy John, et al  REDDIE & GROSE 16 Theobalds Road London, WC1X 8PL London, WC1X 8PL (GB)