(19)

(11)

EP 0 494 235 A1

(12)

(43) Date of publication: 15.07.1992 Bulletin 1992/29 (21) Application number: 90915143.0 (22) Date of filing: 26.09.1990

(51) International Patent Classification (IPC):  C08G 59/ 02( . ) C08L 63/ 00( . ) H05K 1/ 09( . ) C08K 3/ 08( . ) H01B 1/ 22( . ) (86) International application number: PCT/GB1990/001473 (87) International publication number: WO 1991/005354 (18.04.1991 Gazette 1991/09)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 27.09.1989 GB 19890021742 (71) Applicant: COOKSON GROUP plc London EC2V 6EQ (GB)	(72) Inventor: PANG, Pak, Keung Oxon OX7 2QP (GB) (74) Representative: Allard, Susan Joyce  BOULT, WADE & TENNANT 27 Furnival Street London EC4A 1PQ London EC4A 1PQ (GB)