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Thermal transfer film

A technology of thermal transfer film and light-to-heat conversion layer, applied in printing, copying/marking method, temperature recording method, etc., can solve the problems of difficult OD value, low dispersion efficiency, etc.

Active Publication Date: 2017-02-15
CHEIL IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low dispersion efficiency of pigments (such as carbon black) contained in the light-to-heat conversion layer makes it difficult to obtain a uniform OD value over the entire area of ​​the thermal transfer film
This becomes a limitation in transferring the transfer material from the transfer layer to the receptor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] 45 parts by weight of polymethyl methacrylate and 45 parts by weight of bisphenol A epoxy acrylate were mixed to prepare an adhesive mixture. 10 parts by weight of the metal complex dye was added to the binder mixture, followed by mixing for 30 minutes to prepare a composition. The composition was rod-coated on the base film, and dried at 80° C. for 2 minutes to form a 2.5 μm thick light-to-heat conversion layer to complete the production of the thermal transfer film.

Embodiment 2

[0111] A thermal transfer film was produced in the same manner as in Example 1 except that a diimonium dye was used instead of the metal complex dye.

Embodiment 3

[0113] 50 parts by weight of a water-soluble acrylic polymer, 40 parts by weight of a multifunctional monomer, 7 parts by weight of a pigment, and 3 parts by weight of a diimonium dye were mixed together to prepare a composition. The amount of each component is based on the solids content of the composition. The composition was rod-coated on the base film and dried at 80°C for 2 min at 350 mJ / cm 2 Cured to form a 2.5 μm thick light-to-heat conversion layer.

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Abstract

The present invention relates to thermal transfer films. In particular, the present invention relates to a thermal transfer film formed by adding a binder and a dye to a light-to-heat conversion layer to reduce the deviation of the OD value at a specific wavelength absorbed by the dye. Accordingly, the thermal transfer film has a uniform OD value and improved appearance, thereby more efficiently transferring the transfer material from the transfer layer to the receptor. More specifically, the present invention relates to a thermal transfer film formed by further adding a pigment into the light-to-heat conversion layer to further reduce the deviation of the OD value at a specific wavelength absorbed by the dye. Therefore, the thermal transfer film has a more uniform OD value, and a more improved appearance, thereby more efficiently transferring the transfer material from the transfer layer to the receptor.

Description

technical field [0001] The present invention relates to thermal transfer films. More specifically, the present invention relates to a thermal transfer film comprising a light-to-heat conversion layer and a transfer layer, wherein the light-to-heat conversion layer comprises a binder and a dye to have a small presence at a specific wavelength absorbed by the dye. Fluctuating uniform optical density (OD) values ​​and good appearance, thereby achieving high transfer efficiency from the transfer layer of the transfer material to the receptor. The present invention also relates to a thermal transfer film comprising a light-to-heat conversion layer and a transfer layer, wherein the light-to-heat conversion layer further comprises a pigment to have a more uniform OD with small fluctuations at specific wavelengths absorbed by the dye value and good appearance, thereby achieving a high efficiency of transfer of the transfer material from the transfer layer to the receptor. Backgroun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41M5/36B41M5/385
CPCB41M5/46B41M5/465B41M5/38242
Inventor 李正孝林亨泰姜炅求朴时均
Owner CHEIL IND INC