| (19) |
 |
|
(11) |
EP 0 235 939 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
03.05.1989 Bulletin 1989/18 |
| (43) |
Date of publication A2: |
|
09.09.1987 Bulletin 1987/37 |
| (22) |
Date of filing: 30.01.1987 |
|
| (51) |
International Patent Classification (IPC)4: B41M 5/26 |
|
| (84) |
Designated Contracting States: |
|
AT BE CH DE FR GB IT LI NL SE |
| (30) |
Priority: |
28.02.1986 GB 8604993
15.10.1986 GB 8624696
|
| (71) |
Applicant: ZENECA LIMITED |
|
London W1Y 6LN (GB) |
|
| (72) |
Inventors: |
|
- Gregory, Peter
Bolton BL3 4UN (GB)
- White, Raymond Leslie
Radcliffe M26 0GB (GB)
- Rothwell, Geoffrey Richard
Chadderton
Lancs. OL9 9DJ (GB)
- Porter, Roy
Delph
Oldham OL3 5VW (GB)
|
| (74) |
Representative: Giles, David Eric et al |
|
Intellectual Property Group
Zeneca Specialties
P.O. Box 42
Hexagon House
Blackley
Manchester M9 8ZS
Manchester M9 8ZS (GB) |
|
| |
|
| (54) |
Thermal transfer printing |
(57) A thermal transfer printing sheet comprising a substrate having a coating comprising
a dye of the formula:
A - N = N- E
wherein
A is a phenyl group substituted by at least one electron-withdrawing group selected
from NO₂, CN, CF₃, halogen, -SO₂-C
1-4-alkyl, -SO₂F, -SO₂CF₃, -SO₂NRR¹, -CONRR¹, -COOR, -CO-CO-R, wherein R and R¹ are independently
selected from H and C
1-4 alkyl, provided that where A carries only two halogen atoms these are not in the
2- and 6- positions in relation to the azo link;
and E is the radical of an aniline, a tetrahydroquinoline, a lilolidine or a julolidine
coupling component,
and a thermal transfer printing process for the coloration of a polymeric substrate
using the thermal transfer printing sheet.