| (19) |
 |
|
(11) |
EP 0 284 378 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
08.08.1990 Bulletin 1990/32 |
| (43) |
Date of publication A2: |
|
28.09.1988 Bulletin 1988/39 |
| (22) |
Date of filing: 24.03.1988 |
|
|
| (84) |
Designated Contracting States: |
|
DE GB |
| (30) |
Priority: |
27.03.1987 JP 73192/87
|
| (71) |
Applicant: FUJI PHOTO FILM CO., LTD. |
|
Kanagawa 250-01 (JP) |
|
| (72) |
Inventors: |
|
- Tatsuta, Sumitaka c/o Fuji Photo Film Co., Ltd.
Fujinomiya-shi Shizuoka (JP)
- Ishige, Sadao
Fuji Photo Film Co., Ltd.
Fujinomiya-shi Shizuoka (JP)
|
| (74) |
Representative: Diamond, Bryan Clive (GB) et al |
|
Gee & Co.
Chancery House
Chancery Lane
GB-London WC2A 1QU
GB-London WC2A 1QU (GB) |
|
| |
|
| (54) |
Light-fixable heat-sensitive recording material |
(57) A light-fixable heat-sensitive recording material has a layer of a diazonium salt
component and a coupler capable of reacting with the diazonium salt component to form
color wherein the diazonium salt component comprises at least two diazonium salts,
one having a maximum light absorption wavelength of 410 ± 10 nm and the other having
a maximum light absorption wavelength of 385 ± 10 nm, preferably in a respective ratio
by weight of 9:1 to 1:9.
The salt or coupler is preferably microencapsulated in a wall which becomes permeable
when heated.
The layer preferably includes a basic substance which acelerates coloration, and/or
a sensitiser; there may be also an overcoat layer and/or a backing layer.
The material is locally thermally heated by a thermal head and overall exposed to
fix it, to give an image of high density on a white ground.