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Color developer and thermal recording material containing the same

A heat-sensitive recording material and developer technology, applied in the temperature recording method, copying/marking method, printing, etc., can solve the problem of insufficient improvement of background color whitishness, storage stability (moisture and heat resistance, water resistance, plasticizer resistance) Insufficient resistance and heat resistance, poor background whiteness, etc.

Inactive Publication Date: 2005-10-19
KONISHI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the thermosensitive recording materials disclosed in JP-A-2001-260544 and JP-A-2001-293964 have the following problems: in particular, the whiteness of the background color is poor (so-called generation of whitish background color), and the storage stability (moisture resistance, water resistance, plasticizer resistance and heat resistance) are not enough
In addition, the heat-sensitive recording material disclosed in JP-A-2002-120462 is excellent in plasticizer resistance, but there is a problem that the improvement of the whitishness of the ground color is insufficient.

Method used

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  • Color developer and thermal recording material containing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] First, a mixture of 4,4'-dihydroxydiphenylsulfone and 2,4'-dihydroxydiphenylsulfone was prepared by the following method. That is, 197g of 1,2-dichlorobenzene and 141.4g (1.5 moles) of phenol are charged into the reactor, while stirring the above-mentioned contents, 60.0g (0.6 moles) of 98% sulfuric acid is added dropwise, and the temperature is raised after the dropwise addition is completed. . Then, the reaction is carried out, and the content boils at about 148° C., and the distillation of 1,2-dichlorobenzene and water (the water produced by the reaction) starts. After condensing the distillate with a condenser and separating it into two phases with a separator, 1,2-dichlorobenzene as a lower phase was continuously returned to the reactor (inside the reaction system). From the start of the distillation until 6 hours later, the temperature of the reactants (contents) rose to 180° C., and the generation of water ceased. The amount of the upper phase (aqueous phase) s...

Embodiment 2

[0078] By the same operation as in Example 1, a thermosensitive record paper, and carry out the above test. The results are shown in Table 1.

[0079] Table 1

[0080] Dynamic color test

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Abstract

A thermal recording material which is obtained by dispersing in a dispersion medium a color-forming dye and a color developer which comprises 2,4'-dihydroxydiphenyl sulfone as the main ingredient and in which the proportion of 2,4'-dihydroxydiphenyl sulfone to 4,4'-dihydroxydiphenyl sulfone is from 90 / 10 to 100 / 0, excluding 90 / 10, by weight and the content of phenyl phenolsulfonate is 1.5 wt.% or lower based on the sum of those two compounds to thereby prepare a dispersion, applying the dispersion to a substrate, and drying it. The thermal recording material hence comprises the substrate and formed thereon a heat-sensitive color-developing layer comprising the color developer and color-forming dye. This recording material is reduced in background fogging and excellent in storage stability. The color developer is suitable for use in the thermal recording material.

Description

technical field [0001] The present invention relates to a developer containing 2,4'-dihydroxydiphenylsulfone or 4,4'-dihydroxydiphenylsulfone as a main component and a thermosensitive recording material containing the developer. Background technique [0002] Conventionally, thermosensitive recording paper (thermosensitive recording material) having a thermosensitive color-developing layer containing a developer and a color-developing dye has been widely used in various types of information communication devices such as facsimile machines and information recording devices such as printers. Recording paper (output paper) of the device. The heat-sensitive recording paper is required to have high color sensitivity (color rendering), and in order to be able to preserve the required color image and background color (the part where the color image is not formed) for a long time, it is required to have high fastness (short timeliness) and other performance. [0003] For example, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41M5/333B41M5/337
CPCB41M5/3336
Inventor 大井册雄柳濑典男名手伸之
Owner KONISHI CHEM IND
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