JPS61132376A - Ink jet recording sheet - Google Patents

Abstract

PURPOSE:To maintain favorable appearance and prevent tackiness even under high humidity, by providing a layer comprising a water-soluble high molecular weight compound and at least one surfactant on a base. CONSTITUTION:The layer comprising a mixture of a water-soluble high molecu lar weight compound and a surfactant is provided on the base. The high molecu lar weight compound is more preferable as it has a higher absorption of a water-soluble ink. The amount of the surfactant added to 0.1-20 parts per 100 parts of the high molecular weight compound. The surfactant is mixed into an aqueous solution of the high molecular weight compound, and after sufficient mixing, the resultant mixture is applied to the base. As the base, a transparent plastic film such as a polyester film or a glossy art paper or the like shows an excellent effect, in the cases of films the appearance of which is liable to be degraded due to adhesion of fingerpirnts, and tackiness of the surface can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording sheet suitably used in an inkjet recording system, particularly an inkjet system using water-soluble ink.

[Conventional technology]

With the development of office automation equipment, inkjet recording sheets with a variety of materials and structures have been developed, but inkjet recording sheets usually have a structure in which an ink absorbing layer is provided on a support such as paper. It is said that and,
An ink absorbing layer using a water-soluble polymer is already known, and Japanese Patent Application Laid-Open No. 148583/1983 describes a method in which a recording liquid receiving layer containing a water-soluble resin and finely divided silicic acid as main components is formed on a support. A record sheet prepared for the purpose is disclosed. However, the conventional recording sheet 1. As an ink absorbing layer on the support,
Since it is coated with a large amount of the above-mentioned finely divided silicic acid and other inorganic pigments and a small amount of water-soluble polymer compound, it is unlikely that only a water-soluble polymer compound layer will be formed on the surface, which will prevent fingerprints and polymeric compounds. It didn't get sticky under humid conditions. However, when transparency is required for a sheet such as an OHP sheet, the transparent sheet is coated with only a water-soluble polymer compound, excluding the opaque components such as silicic acid anhydride and other inorganic pigments. In this way, if you touch the recording sheet by hand, not only before inkjet recording, but after recording, fingerprints will clearly adhere to it, damaging the appearance (also, if you do not store it in a high humidity environment) It has the disadvantage of becoming sticky when left on.

On the other hand, Japanese Patent Laid-Open No. 56-996.93 discloses a technique for improving the water resistance of ink after printing by coating a cationic surfactant on the support of a recording sheet. In this patent, printing is performed using a water-soluble ink containing a water-soluble polymer compound on a cationic surfactant-coated support, but this method uses a polyester film that does not have ink absorption ability on the support. OHP sheets cannot be used because they lack absorbency.

[Problem that the invention seeks to solve]

Therefore, the present invention provides excellent printing characteristics by using a water-soluble polymer compound without incorporating a large amount of inorganic components or no inorganic components, and also prevents the appearance of the recording sheet from being damaged by fingerprints even when the recording sheet is hand-printed. To provide an excellent inkjet recording sheet that does not become sticky and has little stickiness even when stored under high humidity.

[Means for solving problems]

The present invention was made based on the knowledge that the above problems can be effectively solved by providing a layer containing a mixture of a water-soluble polymer compound and a surfactant on a support in advance. .

That is, the present invention provides an inkjet recording sheet characterized in that a layer containing a water-soluble polymer compound and at least one surfactant is provided on a support.

The water-soluble polymer compound used in the present invention may be any water-soluble polymer compound as long as it has the ability to absorb water-soluble ink, and the higher the absorption ability, the more preferable it is. For example, polyvinyl alcohol, polyacrylamide, polyvinylpyrrolidone, gelatin, starch, oxidized starch, polydimethylacrylamide, polydimethylaminomethacrylate, polysodium acrylate, acrylic acid methacrylic acid copolymer salt, carboxymethylcellulose, polyethylene glycol, etc. They may be used alone or in combination of two or more. Among these, poly, vinyl alcohol (molecular weight 20,000 to 200,000),
Polyacrylamide (molecular weight 100,000 to 5 million), polyvinylpyrrolidone (molecular weight 30,000 to 500,000), polydimethylacrylamide (molecular weight 100,000 to 2 million), polydimethylamino methacrylate (molecular weight 10,000 to 1 million)
is particularly preferred from the viewpoint of ink absorption and film forming properties. In addition, these water-soluble polymer compounds can be crosslinked, laked, etc.
It may also be partially water resistant.

The surfactant used in the present invention may be one type or a mixture of two or more of cationic surfactants, anionic surfactants, amphoteric surfactants, and nonionic surfactants, but the water-soluble polymer used If the compound is cationic, cationic surfactants, amphoteric surfactants, nonionic surfactants are used; if the water-soluble polymer compound is anionic, anionic surfactants, amphoteric surfactants, nonionic surfactants are used. These agents are preferred from the viewpoint of compatibility. In addition, when the ink dye is acidic, cationic surfactants, amphoteric surfactants,
When the nonionic surfactant is a basic dye, anionic surfactants, amphoteric surfactants, and nonionic surfactants are preferred from the viewpoint of ink fixability and water resistance of printing. Specifically, the surfactants include fatty acid soaps having 10 to 24 carbon atoms, alkyl sulfate salts in which the alkyl group has 9 to 18 carbon atoms, and polyoxyethylene alkyl sulfate salts;
α-olefin sulfonate having 10 to 22 carbon atoms, inner olefin sulfonate, vinylidene olefin sulfonate, α-sulfo fatty acid salt, alkylbenzene sulfonate having alkyl group having 8 to 16 carbon atoms, carbon number 1
Anionic surfactants such as 0-20 phosphate ester salts, FOE (P=2-30) alkyl (C8-22) or alkenyl (C8-22) ethers, POE, (F=
2-30) alkyl (C6-22) or alkenyl (C
6-22) Phenol ether, fatty acid (C8-22)
Polyethylene glycol type nonionic surfactants such as alkanolamide, polyhydric alcohol type nonionic surfactants such as Span, Tween, and sucrose fatty acid esters, primary, secondary, Cationic surfactants such as grade amine salts, quaternary ammonium salts, or amine oxides, and one or more amino acid type or betaine type amphoteric surfactants whose alkyl or alkenyl groups have 10 to 24 carbon atoms. A mixture is exemplified. Among these surfactants, alkyl sulfate salts, quaternary ammonium salts, and betaine type amphoteric surfactants are preferred. The amount of surfactant added is 0.1 to 20 parts, preferably 0.1 to 20 parts per 100 parts of the water-soluble polymer compound.
It is desirable to set it as 0.5-15 parts. If it is too small, the effect will be insufficient, and if it is too large, the surfactant will seep out onto the surface, causing sliminess or reducing the fixing speed of the ink.

The recording sheet of the present invention can be obtained by adding a predetermined amount of a surfactant to an aqueous solution of a water-soluble polymer compound, thoroughly mixing the mixture, and then coating the mixture on a support. Various materials such as plastic film, glass, and paper can be used as the support used here, but plastic films such as transparent polyester film and glossy art paper tend to deteriorate the appearance due to fingerprints. It is preferable because it exhibits excellent effects on films. The coating method is a known method (e.g. Eva,
It is carried out by a rod coach ink method or a roll coating method, and generally about 5 to 30 parts are coated on the support. In addition, a predetermined amount of a surfactant solution is sprinkled onto a sheet coated with only a water-soluble polymer compound.
After diffusing the surfactant into the water-soluble polymer compound, effectively creating a state in which the surfactant is blended with the water-soluble polymer,
It may be dried to create a sheet.

The present invention is particularly useful for sheets having a coating layer of only a water-soluble polymer compound on a support.
The present invention is not limited to this, and also includes compounds in which inorganic pigments, water-insoluble resins, etc. are blended with water-soluble polymer compounds.

〔Effect of the invention〕

According to the present invention, it is possible to prevent deterioration of the appearance due to the adhesion of fingerprints that occur when the inkjet recording sheet is touched, and to suppress the stickiness of the surface, so that the commercial value of the inkjet recording sheet is significantly improved. It is particularly effective for sheets that tend to deteriorate in appearance, such as OF (P sheets, second original drawing sheets, which require transparency, and art paper, which requires gloss).

Next, the present invention will be explained with reference to Examples, but the present invention is not limited thereto.

[Example] Example 1 Dissolve 100 parts of polyvinylpyrrolidone (average molecular weight 160,000) in water to prepare a 15% aqueous solution, then add 10 parts of the surfactant listed in Table 1 and stir to mix uniformly. Then, the coating liquid was added. Next, use a polyester film (thickness 1
A coating solution was applied onto the film (00μ) using a coating rod, and air-dried to prepare an OHP sheet for inkjet use. The thickness of the coating layer is 10μ. still,
As a comparative example, an inkjet OHP sheet was prepared by coating it with a water-soluble polymer containing only polyvinylpyrrolidone without containing a surfactant.

The thickness of the coating layer is also 10μ.

These films are susceptible to fingerprints, high temperatures,
The degree of stickiness under high humidity was sensory evaluated.

The results are summarized in Table-1.

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"I hate it." = Shu = Fu (萩萄). 4 Shu ζ ■ I P Tsukuda J-Hyou 輻! Straw Example 2 A sheet was made in the same manner as in Example 1, except that the surfactant was fixed to stearyltrimethylammonium chloride and the type of water-soluble polymer compound was changed, and the performance was evaluated. As a comparative example, a sample to which no surfactant was added was also evaluated in the same manner. The water-soluble polymer compounds used and the evaluation results are summarized in Table-2.

It is clearly seen from Table 2 that the products of the present invention have excellent effects.

Example 3 A sheet was made in the same manner as in Example 1, except that stearyltrimethylammonium chloride was used as the surfactant and the amount added was varied, and the performance was evaluated. The amount of stearyltrimethylammonium chloride added and the amount blended are summarized in Table 3. The amount added is expressed as a proportion to 100 parts by weight of polyvinylpyrrolidone.

Claims (3)

[Claims] (1) A water-soluble polymer compound and at least one
An inkjet recording sheet comprising a layer containing a surfactant. (2) The sheet according to claim (1), which contains a surfactant in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the water-soluble polymer compound. (3) The sheet according to claim (1) or (2), wherein the support is a synthetic resin sheet or art paper.