(19)

(11)

EP 0 663 002 A1

(12)

(43) Date of publication: 19.07.1995 Bulletin 1995/29 (21) Application number: 93921045.0 (22) Date of filing: 01.10.1993

(51) International Patent Classification (IPC):  C10M 105/ 22( . ) C10M 105/ 40( . ) C10N 20/ 00( . ) C10N 50/ 08( . ) C10M 105/ 38( . ) C10M 169/ 04( . ) C10N 40/ 24( . ) (86) International application number: PCT/GB1993/002050 (87) International publication number: WO 1994/007973 (14.04.1994 Gazette 1994/09)

(84) Designated Contracting States: AT BE CH DE ES FR GB GR IT LI NL PT SE (30) Priority: 01.10.1992 GB 19920020719 (71) Applicant: ALCAN INTERNATIONAL LIMITED Montreal Quebec H3A 3G2 (CA)

(72) Inventors: CARR, Alan, Robert Albann House Moreton Pinkney Northamptonshire NN11 6SP (GB) SHEASBY, Peter, Geoffrey 71 Courtington Lane Oxfordshire OX15 4HS (GB) MARWICK, William, Francis 87 Bolling Road West Yorkshire LS29 8QA (GB) BARKER, Joanna, Mary 13 Wiltshire Drive Cheshire CW12 1NX (GB) (74) Representative: Pennant, Pyers, et al  Stevens, Hewlett & Perkins 1 Serjeants' Inn Fleet Street London EC4Y 1LL London EC4Y 1LL (GB)