Record receiver having plural interactive leaves or a colorless – Having a colorless color-former – developer therefor – or... – Identified organic electron acceptor other than phenolic resin
Reexamination Certificate
2002-04-26
2004-06-08
Edwards, N. (Department: 1774)
Record receiver having plural interactive leaves or a colorless
Having a colorless color-former, developer therefor, or...
Identified organic electron acceptor other than phenolic resin
C430S138000, C430S170000, C430S171000
Reexamination Certificate
active
06746985
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a heat-sensitive recording material, more particularly, to a heat-sensitive recording material of full-color including a support and at least three heat-sensitive recording layers on the support, the heat-sensitive recording material being excellent in image stability, handling property, color development and fixing speed.
2. Description of the Related Art
Heat-sensitive recording progressed recently since the recording apparatus thereof is simple, reliability is high and maintenance is not necessary. As materials thereof, there are conventionally widely known those utilizing a reaction of an electron-donating colorless dye with an electron-accepting compound which allows the dye to develop color, those utilizing a reaction of a diazo compound or diazonium salt (hereinafter, simply referred to as diazo compound or the like, in some cases) with a coupler which allows this to develop color, and other materials.
Recently, progress of full-color heat-sensitive recording materials is remarkable, and such full-color heat-sensitive recording materials have a structure in which layers that develops yellow, magenta and cyan colors respectively are provided, and full-color images can be formed by heating the layers to cause color development.
As the above-mentioned full-color heat-sensitive recording material, general are materials including a combination of a color-development layer (heat-sensitive recording layer) composed of an electron-donating colorless dye and an electron-accepting compound with a color-development layer composed of a diazo compound or the like and a coupler, in which a yellow layer, magenta layer and cyan layer are provided in this order from the upper layer side.
With the full-color heat-sensitive recording material having the above-mentioned structure, an image is formed. Then the image is fixed by irradiation with light to enhance the stability of the image, by utilizing a photodecomposition property of the diazo compound or the like. In such a light-fixing type full-color heat-sensitive recording material, a layer composed of an electron-donating colorless dye that develops cyan color and an electron-accepting compound is often provided at the lowest layer (layer nearest to a support), for effecting the above-mentioned light-fixation efficiently. However, even in the full-color heat-sensitive recording material of light-fixation type having such a structure, there is a requirement for further improvement in image stability.
Further, improvement in color-developing property is also a great object for the above-mentioned full-color heat-sensitive recording material. However, the above-mentioned full-color heat-sensitive recording material utilizing a reaction of an electron-donating colorless dye with an electron-accepting compound has a problem in image stability since the reaction is an equilibrium reaction, and additionally, there is a necessity to make the content of an electron-accepting compound higher than that of an electron-donating colorless dye. Consequently, a color-development layer containing the above-mentioned electron-donating colorless dye or the like becomes thicker as compared with a color-development layer containing the above-mentioned diazo compound or the like. The thickness of such a color-development layer leads to increased thickness of a full-color heat-sensitive recording material, influencing the color-developing property.
Moreover, since the above-mentioned electron-donating colorless dye and electron-accepting compound is solid-dispersed in a color-development layer, a heat-sensitive recording material is curled by phase transition of them caused by heating, leading to decrease in handling property.
Furthermore, a full-color heat-sensitive recording material including a layer that develops yellow color placed as the uppermost layer has poor fixing speed since the transmittance of light necessary for light-fixation of a diazo compound or the like decreases due to the influence of yellow.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a full-color heat-sensitive recording material excellent in image stability, handling property, color development and fixing speed, in view of the above-mentioned problems.
A means for attaining the above-mentioned object is as described below. Namely, the present invention provides a full-color heat-sensitive recording material including a support, and at least a heat-sensitive recording layer that color-develops to yellow color; a heat-sensitive recording layer that color-develops to cyan color and a heat-sensitive recording layer that color-develops to magenta color, sequentially provided on the support in this order from the support side, wherein all of the above-mentioned heat-sensitive recording layers contain a diazo compound and/or diazonium salt; and a coupler compound that reacts with the above-mentioned diazo compound and/or diazonium salt to cause color development.
One aspect of the present invention provides the above-mentioned full-color heat-sensitive recording material, wherein the above-mentioned heat-sensitive recording layer that color-develops to yellow color contains a diazo compound of the following general formula (I):
General Formula (I)
In the general formula (I), R
1
, R
2
, R
3
and R
4
each independently represent any group selected from the group consisting of a hydrogen atom, halogen atoms, alkyl groups, aryl groups, —OR
51
, —SR
51
, —COOR
51
, —CONR
51
R
52
, —SO
2
R
51
, —SO
2
NR
51
, R
52
, —COR
51
, —NR
51
R
52
, nitro group and cyano group. R
51
and R
52
each independently represent any group selected from the group consisting of a hydrogen atom, alkyl groups, aryl groups and acyl group. R
5
represents any group selected from the group consisting of a hydrogen atom, alkyl groups, aryl groups, —COOR
53
, —CONR
53
R
54
, —SO
2
NR
53
, —SO
2
NR
53
R
54
and —COR
53
. R
53
and R
54
each independently represent any group selected from the group consisting of a hydrogen atom, alkyl groups, aryl groups and acyl group.
Another aspect of the present invention provides the above-mentioned full-color heat-sensitive recording material, wherein the above-mentioned heat-sensitive recording layer that color-develops to cyan color contains at least one of diazonium salts of the following general formulae (A) to (C):
In the general formula (A), Ar represents a substituted or unsubstituted aryl group. R
17
and R
18
each independently represent a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group and may be the same and may be different from each other. In the general formula (B), R
20
, R
21
and R
22
each independently represent a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group and may be the same and may be different from each other. Y represents a hydrogen atom or OR
19
. R
19
represents a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group. In the general formula (C), R
23
and R
24
each independently represent a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group and may be the same and may be different from each other.
Another aspect of the present invention provides the above-mentioned full-color heat-sensitive recording material, wherein the above-mentioned heat-sensitive recording layer that color-develops to magenta color contains a diazonium salt of the following general formula (1):
In the general formula (1), R
31
and R
32
each independently represent a hydrogen atom, alkyl group or aryl group. R
33
and R
34
each independently represent a hydrogen atom, alkyl group, aryl group or halogen atom. R
35
, R
36
, R
37
, R
38
and R
39
each independently represent a hydrogen atom, alkyl group, aryl group, halogen atom, alkoxy group, aryloxy group, alkoxycarbonyl group, acyloxy group, carbamoyl group, amide group, cyano group, alkylthio group, arylthio group, alkylsulfonyl group, or arylsulfonyl group. At le
Edwards N.
Fuji Photo Film Co. , Ltd.
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