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Thermal recording medium

A thermal recording medium and recording layer technology, applied in temperature recording method, copying/marking method, printing, etc., can solve the problems of being unsuitable for practical application and expensive resin

Inactive Publication Date: 2004-10-27
DAINICHISEIKA COLOR & CHEM MFG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the resin forming the back layer is also too expensive to be suitable for practical use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0052] Containing R represented by formula (I) now f The method for the preparation of diols is described more specifically.

[0053] First, in an equivalent ratio, in a solvent-free manner or in an organic solvent, with or without the presence of a common polymerization catalyst for polyurethane (for example, organometallic compounds, tertiary amines, etc.), at 0-150 ° C, preferably 20 At -90°C, react a fluorine-containing compound with an active hydrogen-containing group and a diisocyanate, so that the resulting reaction product contains one free isocyanate group (NCO / OH≈2) in its molecule.

[0054] At 50°C or lower than 50°C, preferably at 40°C or lower than 40°C, more preferably at 30°C or lower than 30°C, the above-mentioned fluorine-containing compound with one free isocyanate group is added dropwise to Among the dialkanolamines mentioned above.

[0055] Under these conditions, the isocyanate group reacts selectively with the amino group [Ann.Chem., 562, 205 (1949)] be...

reference example 1

[0112] Reference Example 1 [Synthesis of Fluorinated Diol (1-A)]

[0113] In a reaction vessel equipped with a stirrer, a thermometer, a nitrogen inlet tube and a reflux condenser, flush with nitrogen, dissolve toluene-2,4-diisocyanate (17.4 parts) in ethyl acetate (50 parts), and dissolve the resulting solution It was heated to 60°C, at which temperature 2-(perfluorooctyl)ethanol (46.4 parts) powder was gradually added with sufficient stirring. After the addition, isophorone diisocyanate and 2-(perfluorooctyl)ethanol were reacted at 80° C. for 3 hours to form a perfluoroalkyl-containing one-terminal isocyanate (A).

[0114] Next, under stirring, diethanolamine (10.5 parts) was mixed into ethyl acetate (10 parts) at a temperature lower than 10° C., and the reaction mixture containing compound (A) was added dropwise to the resulting solution, and each addition was observed. Exothermic reaction that occurs when the reaction mixture contains compound (A). Therefore, the dropwis...

reference example 2

[0117] Reference Example 2 [Synthesis of Fluorinated Diol (I-B)]

[0118] In addition to replacing toluene-2,4-diisocyanate and 2-(perfluorooctyl)ethanol with isophorone diisocyanate and 2-(perfluoro-7-methyloctyl)ethanol respectively in the same equivalent, Others In the same manner as in Reference Example 1, a fluorine-containing diol white powder having the following structural formula (I-B) was obtained. (Yield: 95%, melting point: 132°C, hydroxyl number: 138).

[0119]

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Abstract

A thermal recording media has a base sheet, a thermal recording layer arranged on one side of the base sheet, and a back layer arranged on an opposite side of the base sheet. The back layer comprises a polyurethane having side chains derived from a fluorine-containing diol represented by the following formula (I): wherein Rf represents a perfluoroalkyl or perfluoroalkenyl group having 1 to 20 carbon atoms; X represents a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenylene group represented by -CH=CH-(CH2)n- in which n stands for an integer of from 1 to 10, or in which n stands for an integer of from 0 to 6; Y represents a direct bond, -O-, -NH-, or -R0-NH- in which R0 is an alkylene group having 1 to 6 carbon atoms; Z represents a direct bond or -N(R')R- in which R is an alkylene group having 1 to 20 carbon atoms and R' is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms; R1 and R2 each independently represent a divalent organic group; and R3 represents a residual group of an aliphatic, alicyclic or aromatic diisocyanate.

Description

technical field [0001] The present invention relates to a thermal recording medium, especially a thermal recording medium having a back layer comprising polyurethane having side chains containing fluorine atoms, which is used for heat-melt type thermal transfer recording and sublimation type thermal transfer print records. Background technique [0002] Commonly known thermal recording media include thermal fusion type thermal recording media and sublimation type thermal recording media. A heat-melt type thermal recording medium has a thermal recording layer (ink layer) by carrying a pigment or dye with a binder resin on one side of a substrate such as a polyester film, and heating the medium from the back side of the medium , so that the ink layer is transferred to the desired material. On the other hand, a sublimation type thermal recording medium utilizes a thermal sublimation dye as a dye, and only the dye is sublimated to be transferred to a desired material. [0003]...

Claims

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Application Information

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IPC IPC(8): B41M5/40B41M5/44C08G18/28C08G18/32C08G18/38C08G18/66
CPCC08G18/2885B41M5/446C08G18/3812B41M5/443C08G18/3275C08G18/6607B41M2205/30B41M5/44B41M5/5281
Inventor 花田和行鸟井克俊木村千也
Owner DAINICHISEIKA COLOR & CHEM MFG CO LTD