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Protective material for heat sensitive paper

A technology for protecting materials and thermal paper, applied in printing, printing devices, copying/marking methods, etc., can solve the problems of falling off of the recording layer, fading of the image, decreased durability of the protective layer, etc., and achieve the effect of good running stability

Active Publication Date: 2007-08-15
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned above, the above-mentioned heat-sensitive recording materials are used in various fields, so the use environments are also different. In daily handling, there are the following problems: the recording layer falls off when it comes into contact with water, and when the polyvinyl chloride film and sheet are overlapped. Various plasticizers contained in polyvinyl chloride cause discoloration of images, discoloration when in contact with grease or solvents, color development, etc.
However, especially when the resin component of the protective layer is made to have a high solid content in order to increase productivity, the viscosity becomes high and coating is difficult, so the molecular weight of the water-soluble polymer is reduced. However, if the water-soluble polymer is simply reduced If the molecular weight of the permanent polymer is low, the durability of the protective layer will decrease, and it cannot be said that the durability of the recording layer and the recorded image is sufficient.

Method used

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Examples

Experimental program
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preparation example Construction

[0026] [Preparation method of emulsion]

[0027] The method for synthesizing the emulsion of the present invention is not particularly limited, but radical polymerization in a solvent mainly composed of water is preferred. The following methods can be mentioned: a method of simultaneously synthesizing a water-soluble polymer (A) and a hydrophobic polymer (B); a method of separately polymerizing a water-soluble polymer and a hydrophobic polymer and mixing them; first synthesizing a water-soluble polymer, A method of synthesizing a hydrophobic polymer in the presence of the water-soluble polymer; a method of synthesizing a hydrophobic polymer first and then synthesizing a water-soluble polymer in the presence of the hydrophobic polymer, etc., but are not limited to the above methods. Moreover, at least one of a water-soluble polymer and a hydrophobic polymer should just contain the monomer (C) which has a sulfonic acid group or its salt. In order to improve the polymerization s...

Embodiment 1

[0038] (Method for simultaneous synthesis of water-soluble polymer and hydrophobic polymer)

[0039] 150.0 parts of distilled water and 0.3 parts of sodium dodecylsulfonate were charged into a separable flask equipped with a stirrer and a reflux condenser, and after replacing with nitrogen, the temperature was raised to 80°C. Then, after adding 2.0 parts of ammonium persulfate, the emulsion obtained by emulsifying the monomers of the following composition with 0.7 parts of sodium lauryl sulfate and 54.4 parts of distilled water was continuously added for about 4 hours, and then aged at 80°C for 2 hours. hours, the polymerization was terminated. After the polymerization was completed, it was cooled to room temperature, then neutralized with aqueous ammonia, and the pH was adjusted to about 8.0 to obtain an emulsion with a solid content of 40.5%.

[0040] (monomer composition)

[0041] 35.0 parts of methacrylamide

[0042] Sodium methallyl sulfonate 0.5 parts

[0043] 10.0 p...

Embodiment 2

[0050] (A method of first synthesizing a water-soluble polymer and then synthesizing a hydrophobic polymer in the presence of the polymer)

[0051] 80 parts by weight of distilled water was poured into a separable flask equipped with a stirrer and a reflux condenser, and after replacing with nitrogen, the temperature was raised to 80°C. Then, after adding 2.0 parts of ammonium persulfate, a mixture of monomers having the following composition and 150 parts of water was continuously added with stirring over 2 hours, and then aged at the same temperature for 2 hours to complete the polymerization. A water-soluble polymer aqueous solution (A1) having a solid content of 30.7% was obtained.

[0052] (Water-soluble polymer monomer composition)

[0053] 55.0 parts of methacrylamide

[0054] Sodium methallyl sulfonate 5.0 parts

[0055] 10.0 parts of methacrylic acid

[0056] 20.0 parts of 2-hydroxyethyl methacrylate

[0057] Acrylonitrile 10.0 parts

[0058] 45 parts of distill...

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Abstract

A protective material for thermal recording paper which comprises an emulsion comprising water, a water-soluble polymer (A), and a hydrophobic polymer (B), characterized in that at least either of (A) and (B) contains structural units derived from a monomer (C) having a sulfo group or salt thereof. The protective material for thermal recording paper has higher resistances to various substances (water resistance, plasticizer resistance, and alcohol resistance) than conventional ones and imparts satisfactory running stability.

Description

technical field [0001] The present invention relates to heat-sensitive recording materials, in particular to the use of specific copolymer emulsions in the intermediate layer, recording layer or protective layer of heat-sensitive paper recording materials to significantly improve the recording layer and recorded images of heat-sensitive paper recording materials Durable thermal paper protection material. Background technique [0002] Generally, a recording material containing a colorless or light-colored electron-donating basic dye and a thermosensitive recording layer of an organic or inorganic electron-accepting substance is provided on a support, and in particular, thermosensitive recording paper is widely used in applications including facsimile, industrial Output sheets for various printers such as measurement terminals, medical terminals, handy terminals, POS systems, and ticket issuing systems. As mentioned above, the above-mentioned heat-sensitive recording material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41M5/337B41M5/30B41M5/28B41M5/42
CPCB41M2205/04B41M2205/40B41M2205/38B41M5/44B41M2205/36B41M5/28B41M5/42B41M5/30
Inventor 江藤彰纪石塚友和小川幸绘小岛隆
Owner MITSUI CHEM INC