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Heat-sensitive recording material

一种热敏记录材料、热敏记录的技术，应用在温度记录法、复制/标记方法、印刷等方向，能够解决起雾增加、颜色灵敏度降低等问题，达到高记录密度、背景起雾的发生少、优异记录灵敏度的效果

Inactive Publication Date: 2010-02-24
OJI PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when such microcapsules containing an oily liquid prepared by dissolving a dye precursor in an organic solvent are used for thermosensitive recording materials, friction and pressure cause increased fogging, resulting in background coloring
This problem is effectively avoided by increasing the thickness of the microcapsule wall, however this causes the problem of reduced color sensitivity

Method used

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Examples

Experimental program
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preparation example Construction

[0051] The polyvalent isocyanate compound-containing polymeric component used in the preparation of the composite particles of the present invention is a compound that forms polyurea or polyurea-polyurethane by reacting with water, and may be a single polyvalent isocyanate compound, or a polyvalent isocyanate compound A mixture with a polyol reacted with it, or an adduct of a polyol and a polyvalent isocyanate compound, or a multimer such as a biuret body or an isocyanurate body of a polyvalent isocyanate.

[0052] Examples of polyvalent isocyanate compounds used in the present invention include m-phenylene diisocyanate, p-phenylene diisocyanate, 2,6-benzylidene diisocyanate, 2,4-benzylidene diisocyanate, naphthalene -1,4-diisocyanate, diphenylmethane-4,4'-diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, 5-isocyanato-1-(isocyanatomethyl) -1,3,3-trimethylcyclohexane, 3,3'-dimethyldiphenylmethane-4,4'-diisocyanate, xylylene-1,4-diisocyanate, m-tetramethyl Xylylene diisocyan...

Embodiment 1

[0125] Preparation of Composite Particle Dispersion Liquid (Liquid A) Containing Dye Precursor

[0126] As a dye precursor, 20 parts of 3-bis(n-butyl)amino-6-methyl-7-anilinofluoran was dissolved in 24 parts of dicyclohexylmethane-4,4'-bis Isocyanate (trade name: Desmodur (registered trademark) W; manufactured by Sumika Bayer Urethane Co., Ltd.). This solution was gradually added to 200 parts of an aqueous solution of 6% polyvinyl alcohol (trade name: Poval (registered trademark) PVA217EE; manufactured by Kuraray Co., Ltd.), using a homogenizer (trade name : T.K.ROBO MICS; manufactured by Tokushu Kika Kogyo Co., Ltd.) Stirring at 7,000 rpm for 2 minutes for emulsification and dispersion. Gained emulsion is heated to 90 DEG C, add 20 parts of polyethyleneimine (trade name: Epomin (registered trademark) SP-003) that has the branched structure that contains primary amine, secondary amine and tertiary amine and molecular weight is 300 as reaction accelerator ; manufactured by ...

Embodiment 2

[0134] A thermosensitive recording material was obtained in the same manner as in Example 1, except that, in the preparation of Liquid A, 20 parts of amines having a branched structure containing primary amines, secondary amines, and tertiary amines and having a molecular weight of 600 were used. A 10% aqueous solution of polyethyleneimine (trade name: Epomin (registered trademark) SP-006; manufactured by Nippon Shokubai Co., Ltd.) was used as a reaction accelerator instead of 20 parts having a branched structure containing primary, secondary, and tertiary amines. And a 10% aqueous solution of polyethyleneimine with a molecular weight of 300 (trade name: Epomin (registered trademark) SP-003; manufactured by Nippon Shokubai Co., Ltd.). At this time, the average particle diameter of the composite particles was 1.0 μm.

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Abstract

Disclosed is a heat-sensitive recording material comprising a supporting body and a heat-sensitive recording layer formed on the supporting body and containing a dye precursor-containing composite particle and a developer. This heat-sensitive recording material is characterized in that the dye precursor-containing composite particle is obtained by dissolving a solute containing a dye precursor into a solvent containing a polyvalent isocyanate compound-containing polymerization component, then emulsifying and dispersing the thus-obtained solution into an aqueous medium, and then performing a polymerization reaction of the polyvalent isocyanate compound-containing polymerization component in the presence of a polyethylene imine having a molecular weight of 200-1,500. Also disclosed is a method for producing such a heat-sensitive recording material.

Description

technical field [0001] The present invention relates to a heat-sensitive recording material comprising a dye precursor in the form of composite particles containing the dye precursor, in particular, the present invention relates to ensuring high heat resistance, very little occurrence of background fogging, and excellent recording Sensitive heat-sensitive recording materials. Background technique [0002] Thermosensitive recording materials utilizing a color-developing reaction of a dye precursor and a developer in which the two color-developing materials are fused by heating and brought into contact with each other to produce a color-developed image are known. Such heat-sensitive recording materials are relatively inexpensive, and recording devices for these materials are small and easy to maintain. Therefore, they are used in a wide range of fields such as recording media for facsimile machines, word processors, various computers, and other applications. However, convent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41M5/28B41M5/30B41M5/337
CPCB41M5/30B41M5/28B41M5/337
Inventor 藤野正俊尾村春夫武藤贤志
Owner OJI PAPER CO LTD
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