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Coating agent for recording layer protection and recording medium coated therewith

A recording medium and recording layer technology, applied to the surface coating liquid device, temperature recording method, coating, etc., can solve the problem of insufficient effect and achieve the effect of excellent water resistance

Inactive Publication Date: 2009-07-22
SEIKO PMC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, acetoacetyl-modified resins and polyamidoamine-epichlorohydrin resins have been proposed (for example, see Patent Document 2), which can obtain a high level of water resistance, but the effect is not yet sufficient

Method used

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  • Coating agent for recording layer protection and recording medium coated therewith

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Carboxyl-modified polyvinyl alcohol KL-118 manufactured by Kuraray Co., Ltd. was used as component (A), and heated and dissolved in water (cooked) so that the solid content concentration became 9%. Resin b obtained in the above synthesis example as component (B) and Catiofast SF (polyethyleneimine) manufactured by BASF Corporation as component (C) were added thereto, and they were respectively After reaching 5 parts, it was diluted with water so that the solid content concentration of KL-118 was 7%, and the coating agent D for protecting the recording layer was obtained. Table 1 shows the evaluation test results.

Embodiment 2

[0052] Except that the addition amount of resin b of component (B) was changed to the amount shown in Table 1, it carried out similarly to Example 1, and obtained the recording layer protection coating agent E. Table 1 shows the results of the evaluation test.

Embodiment 3

[0070] In the recording layer protective coating agent D obtained in Example 1, silica (P-527, manufactured by Mizusawa Chemical Industry Co., Ltd.) was mixed as a filler, stirred so that the solid content concentration relative to the liquid became 2%, and the Coated on the roll paper for facsimile machine ST138B41 (heat-sensitive recording paper without protective layer) manufactured by Pudokumento System Co., Ltd., so that the solid content was 3 g / m 2 Thereafter, drying was performed to obtain a thermosensitive recording medium F having a recording layer protective layer. Table 2 shows the evaluation test results.

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Abstract

A coating agent for recording layer protection, characterized by comprising a carboxy-modified polyvinyl alcohol (A), a polyamide-polyamine epihalohydrin (B), and polyethyleneimine (C). Preferably, it is characterized in that the carboxy-modified polyvinyl alcohol (A) has a degree of saponification of 90 to 99.5 mol%. The coating agent for recording layer protection is highly effective in imparting water resistance to a recording medium. Also provided is a recording medium having high water resistance, characterized by being obtained by applying the coating agent for recording layer protection to a recording layer.

Description

technical field [0001] The present invention relates to a recording layer protective coating agent containing carboxy-modified polyvinyl alcohol, polyamide polyamine epihalohydrin and polyethyleneimine, and a recording medium coated with the coating agent on the recording layer. More specifically, the present invention relates to a coating agent for protecting a recording layer having excellent water resistance and a recording medium coated with the coating agent on a recording layer. Background technique [0002] Previously, water-soluble resins such as polyvinyl alcohol, starch and its derivatives, cellulose derivatives, styrene-maleic anhydride-based resins, acrylic resins, vinyl acetate-based resins, gelatin, and casein were used to protect the recording layer . Among them, the coating film of polyvinyl alcohol has the characteristics of excellent transparency, strength, and water-based ink permeability, and has the advantage of being cheaply available, so it is used as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41M5/28B41M5/30C09D129/14C09D171/03C09D177/06C09D123/02C09D5/00B05D7/24B41M5/337C09D11/00
CPCC09D5/00C08L29/04B41M2205/04B41M2205/40C09D177/00B41M7/0027C08L79/02C09D179/02C09D129/04C08L2205/03C08L77/00
Inventor 那须健司
Owner SEIKO PMC CORP
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