(19)

(11)

EP 0 491 798 A1

(12)

(43) Date of publication: 01.07.1992 Bulletin 1992/27 (21) Application number: 90913852.0 (22) Date of filing: 13.09.1990

(51) International Patent Classification (IPC):  C04B 24/ 30( . ) C04B 32/ 00( . ) C08K 3/ 00( . ) C08L 61/ 04( . ) C04B 28/ 02( . ) C04B 41/ 50( . ) C08K 3/ 34( . ) C08L 61/ 08( . ) (86) International application number: PCT/GB1990/001419 (87) International publication number: WO 1991/004291 (04.04.1991 Gazette 1991/08)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 14.09.1989 GB 19890020853 11.10.1989 GB 19890022927 29.11.1989 GB 19890026932 29.11.1989 GB 19890026931 29.11.1989 GB 19890026930 (71) Applicant: CROMPTON DESIGN MANUFACTURING LIMITED Southport Merseyside, PR8 1QD (GB)	(72) Inventor: CROMPTON, Geoffrey Southport Merseyside PR8 1DQ (GB) (74) Representative: Lyons, Andrew John, et al  ROYSTONS Tower Building Water Street Liverpool L3 1BA Liverpool L3 1BA (GB)