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Heat-sensitive recording material

A heat-sensitive recording material and heat-sensitive technology, applied in the field of color developers, can solve the problems of medium durability of text and images, expensive formula, complex recording layer, etc.

Active Publication Date: 2019-05-21
PAPIERFABRIK AUGUST KOEHLER SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0024] On the other hand, relatively slightly higher dynamic sensitivity values ​​are achieved with specific phenol-free chromogens, where however the durability of the text image is moderate
By means of anti-aging agents (stabilizers), this defect can be compensated, but at the expense of a complex and expensive formulation of the recording layer

Method used

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Experimental program
Comparison scheme
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Embodiment

[0114] Preparation of compounds of formula (I) according to the invention.

[0115] Compounds I-XXXII (Table 2) were prepared as follows:

[0116] Step A - Preparation of Nitroaryl Sulfonanilides

[0117] To a mixture of 55 mmol aromatic amine and 50 mmol pyridine was added portionwise 50 mmol nitroarylsulfonyl chloride with stirring. The mixture was briefly (5-10 min) warmed to 95-100° C., cooled and triturated with 100-150 ml hydrochloric acid (2 mol / l). After suction filtration, it is washed neutral with water and dried. The nitroarylsulfonanilide was used in step B without prior purification.

[0118] Step B - Reduction of Nitro Groups to Primary Amines

[0119] Dissolve 40 mmol of the product from step A in 140 ml of ethyl acetate and incorporate 140 mmol of SnCl with stirring 2 2H 2 O and heated under reflux. The reaction progress was followed by DC (elution solvent: cyclohexane / ethyl acetate 1:1). After the end of the reaction (about 2-3h), dilute with 140ml eth...

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Abstract

The invention relates to a color developer of the formula (I), wherein m and n independently of one another are >= 1, Ar1 is an unsubstituted or substituted (hetero) aromatic radical, Ar2 is an unsubstituted or substituted phenyl radical, and Y is at least one (m+n)-times substituted benzene or naphthalene group, and to a heat-sensitive recording material, comprising a supporting substrate and a heat-sensitive color-forming layer containing at least one color former and at least one phenol-free color developer, wherein the at least one color developer is the compound of the formula (I). The invention further relates to a method for producing said heat-sensitive recording material.

Description

technical field [0001] The present invention relates to a color developer, a thermosensitive recording material comprising a carrier substrate, at least one color coupler and a thermosensitive color-forming layer containing at least the color developer, a preparation method thereof, and a phenol-free color-developing material contained in the thermosensitive recording material use of the agent. Background technique [0002] Thermosensitive recording materials for direct thermal printing applications having a thermosensitive color-forming layer (thermo-reactive layer) applied to a support substrate have been known for a long time. A coupler and a developer are usually present in a heat-sensitive color-forming layer, which react with each other under the action of heat and cause color development. Widespread are inexpensive phenolic developers, such as bisphenol A and bisphenol S, with which thermosensitive recording materials can be obtained with acceptable performance chara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C311/60B41M5/333
CPCB41M5/3333C07C311/60B41M5/323B41M5/3375C07C317/50
Inventor M·霍恩K·兹艾林格
Owner PAPIERFABRIK AUGUST KOEHLER SE