Record receiver having plural interactive leaves or a colorless – Having a colorless color-former – developer therefor – or... – Having nonchromogenic liquid spread-control or...
Reexamination Certificate
2002-07-02
2004-03-02
Edwards, N. (Department: 1774)
Record receiver having plural interactive leaves or a colorless
Having a colorless color-former, developer therefor, or...
Having nonchromogenic liquid spread-control or...
C503S216000
Reexamination Certificate
active
06699816
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a heat-sensitive recording material. More specifically, it relates to a heat-sensitive recording material, which has a high color optical density and has excellent image stability, chemical resistance, head matching (sticking) property, suitability for ink jet recording and ink jet sheet resistance.
2. Description of the Related Art
In general, a heat-sensitive recording material is relatively inexpensive, and a recording appliance therefor is compact and maintenance-free. Accordingly, the heat-sensitive recording material has found wide acceptance. Recently, competition in sales of the heat-sensitive recording material has intensified, and a higher performance distinguished from an ordinary performance is being required of the heat-sensitive recording materials. To meet requirement, studies on a color optical density, an image stability and a head matching property of a heat-sensitive recording material have been earnestly conducted.
In ordinary heat-sensitive recording materials, 2,2-bis(4-hydroxyphenyl)propane (so-called “bisphenol A”) has been widely used as an electron-accepting compound which, reactions with an electron-donating colorless dye to make a colorless coating material, develop a color. Nevertheless, in these heat-sensitive recording materials, a sensitivity, background fogging, an image stability, a chemical resistance and a heat matching (sticking) property have not all been satisfied at the same time.
Japanese Patent Application Publication (JP-B) No. 4-20792 discloses a recording material which uses an N-substituted sulfamoylphenol or an N-substituted sulfamoylnaphthol as an electron-accepting compound, and discloses that this recording material (pressure-sensitive, heat-sensitive) has improved image density, image stability and cost. However, there is still room for further improvements to the image density and the image stability.
Moreover, when a full-color information is recorded in a heat-sensitive recording material, recording is sometimes conducted using ink jet printing ink. However, when an ordinary heat-sensitive recording material is subjected to ink jet recording, a color of ink is not faithfully reproduced, nor is a vivid color given. A color may become dull, and information recorded in a heat-sensitive mode may be lost. Further, when a sheet that was recorded by an ink jet system comes into contact with a heat-sensitive recording paper, a heat-sensitive recording image may be lost.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a heat-sensitive recording material having a high color optical density and an excellent stability of an image area, chemical resistance, ink jet recordability, ink jet sheet resistance and head matching (sticking) property.
The present inventors have assiduously researched electron-accepting compounds, sensitizers and image stabilizers, and have developed an excellent heat-sensitive recording material to complete the present invention.
That is, the object of the present invention is attained by the following ways.
A first aspect of the present invention is a heat-sensitive recording material comprising a support having disposed thereon a heat-sensitive color-developing layer including an electron-donating colorless dye, 4-hydroxybenzenesulfoanilide as an electron-accepting compound, and 2-benzyloxynaphthalene and ethylenebisstearic acid amide as a sensitizer, wherein a mass ratio (x/y) of the 2-benzyloxynaphthalene (x) to the ethylenebisstearic acid amide (y) is from 95/5 to 40/60.
A second aspect of the present invention is a heat-sensitive recording material comprising a support having disposed thereon a heat-sensitive color-developing layer including an electron-donating colorless dye, 4-hydroxybenzenesulfoanilide as an electron-accepting compound, 2-benzyloxynaphthalene and methylolstearic acid amide as a sensitizer, and 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane and 1,1,3-tris(2-methyl-4-hydroxy-5-cyclohexylphenyl)butane as an image stabilizer, wherein a mass ratio (x/y) of the 2-benzyloxynaphthalene (x) to the methylolstearic acid amide (y) is from 95/5 to 40/60.
A third aspect of the present invention is the heat-sensitive recording material, according to the first aspect, wherein the heat-sensitive color-developing layer further comprising, as an image stabilizer, at least one of 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane and 1,1,3-tris(2-methyl-4-hydroxy-5-cyclohexylphenyl)butane.
A fourth aspect of the present invention is the heat-sensitive recording material, according to the first or second aspect, wherein a dry weight coating amount of the electron-donating colorless dye comprises from 0.1 to 1.0 g/m
2
.
A fifth aspect of the present invention is the heat-sensitive recording material, according to the first or second aspect, wherein the amount according to the image stabilizer comprises from 10 to 100 parts by mass relative to 100 parts by mass according to the electron-donating colorless dye.
A sixth aspect of the present invention is the heat-sensitive recording material, according to the first or second aspect, wherein the amount according to 4-hydroxybenzenesulfonanilide as the electron-accepting compound comprises from 50 to 400% by mass relative to the electron-donating colorless dye.
A seventh aspect of the present invention is the heat-sensitive recording material, according to the first or second aspect, wherein the total amount of the sensitizer comprises from 75 to 200 parts by mass relative to 100 parts by mass of 4-hydroxybenzenesulfonanilide as the electron-accepting compound.
An eighth aspect of the present invention is the heat-sensitive recording material, according to the first or second aspect, wherein the heat-sensitive color-developing layer further comprising, as an inorganic pigment, at least one selected from the group consisting of precipitated calcium carbonate, calcium hydroxide and amorphous silica.
A ninth aspect of the present invention is the heat-sensitive recording material, according to the first or second aspect, wherein the heat-sensitive color-developing layer further comprising, as a mordant, a compound including at least one cationic group selected from the group consisting of amide groups, imide groups, primary amino groups, secondary amino groups, tertiary amino groups, a primary ammonium salt groups, secondary ammonium salt groups, tertiary ammonium salt groups and quaternary ammonium salt groups.
A tenth aspect of the present invention is the heat-sensitive recording material, according to the first or second aspect, wherein the heat-sensitive color-developing layer is formed by coating with a curtain coater and drying.
An eleventh aspect of the present invention is the heat-sensitive recording material, according to the first or second aspect, further comprising a protective layer disposed on the heat-sensitive recording layer.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the first aspect of the present invention, the heat-sensitive recording material comprising a support having disposed thereon a heat-sensitive color-developing layer including an electron-donating colorless dye, 4-hydroxybenzenesulfoanilide as an electron-accepting compound, and 2-benzyloxynaphthalene and ethylenebisstearic acid amide as a sensitizer, wherein a mass ratio (x/y) of the 2-benzyloxynaphthalene (x) to the ethylenebisstearic acid amide (y) is from 95/5 to 40/60.
Further, in the second aspect of the present invention, the heat-sensitive recording material comprising a support having disposed thereon a heat-sensitive color-developing layer including an electron-donating colorless dye, 4-hydroxybenzenesulfoanilide as an electron-accepting compound, 2-benzyloxynaphthalene and methylolstearic acid amide as a sensitizer, and 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane and 1,1,3-tris(2-methyl-4-hydroxy-5-cyclohexylphenyl)butane as an image stabilizer, wherein a mass ratio (x/y) of the 2-benzyloxynaphthalene (x) to the methylolstearic acid a
Iwasaki Masayuki
Mitsuo Hirofumi
Watanabe Tsutomu
Edwards N.
Fuji Photo Film Co. , Ltd.
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