JPH07149035A - Files for ink jet recording sheets - Google Patents

Abstract

PURPOSE:To improve the preservability and transparency of ink jet recorded images by using a base material of a specific haze value for files for ink jet recording sheets and by providing a coated layer containing an ultraviolet absorbing agent in a non-contact interface with recording sheets. CONSTITUTION:In a file for maintaining ink jet recorded sheets printed with images by an ink jet printer, a base material with a haze value of 10% or less under ASTM D1003 and having a coated layer containing an ultraviolet absorbing agent of 1mg/m<2> or more at the non-contact interface with a recording sheet, is used. A coated layer provided in the non-contact interface with a recording sheet of paper of a base material is provided by coating an ultraviolet absorption agent together with a binder, an antistatic agent, a cross linking agent, a plasticizer, a surfactant dissolved or dispersed in an organic solvent or water. Ink jet recorded images maintained in a file are prevented effectively from fading.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file for storing an ink jet recording sheet after printing, and more specifically, a file for storing an ink jet recording sheet excellent in storability and transparency of an ink jet recording image. It is about.

[0002]

2. Description of the Related Art Ink jet recording is a system in which minute droplets of ink are ejected by various operating principles and adhered to a recording sheet such as paper or film to record images, characters and the like. Inkjet printers have features such as high-speed printing, low noise, high flexibility in recording patterns, and no need for development or fixing, and can form complex images accurately and quickly. In recent years, it has been rapidly popularized for various purposes, especially as a hard copy creating apparatus for image information such as characters and various figures created by a computer.

In the ink jet recording system, it is easy to perform multicolor recording by using a plurality of ink nozzles. The multi-color inkjet recording method is widely used because it is possible to obtain images that are comparable to multi-color printed matter and color photographs, and it is cheaper than printing technology and photographic technology for applications with a small number of copies. It's starting.

In recent years, the fields of use of ink jet printers, which have received a great deal of attention, include the production of color proofs and the output of design images in the design field in the printing field where high image quality close to that of photographs is required. Further, it is also practiced to output characters and image information created by a computer to a transparent recording sheet using an inkjet printer, and use this as an original for an overhead projector for presentations at conferences and the like.

In general, a recording sheet used in such an ink jet recording system has an ink receiving medium composed of a water-soluble resin, an inorganic pigment, an additive, etc. on a support such as paper or film in order to improve ink absorbability. It is produced by providing layers. Then, an ink containing a dye, a pigment, water, a water-soluble organic solvent and the like is attached to a recording sheet using an inkjet printer to form an image.

By the way, it is known that when an image printed by the ink jet recording system is exposed to sunlight or a fluorescent lamp for a long period of time, dyes and pigments in the ink decompose and fade. For this reason, inks containing dyes and pigments having high light resistance are used, and JP-A-55-151041, JP-A-55-151042 and JP-A-55-16497 are used.
As described in JP-A No. 5 and JP-A No. 58-180549, it has been attempted to improve the light resistance of an image by adding an ultraviolet absorber to the ink receiving layer of an inkjet image receiving sheet. .

However, in addition to the light resistance of dyes and pigments that can be used in the ink jet recording system, there is a limit, and when an ultraviolet absorber is added to the ink receiving layer of an ink jet image receiving sheet, it reacts with the components in the ink receiving layer. There was also the problem of coloring.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a file for storing an ink jet recording sheet, which has good storability and transparency of an ink jet recorded image which cannot be realized by such a conventional technique.

[0009]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventors have found that a film having a low haze value is used as a base material in a file for storing an ink jet recording sheet. By using a coating layer containing a specific amount of an ultraviolet absorber on the surface of the base material that does not come into contact with the inkjet recording sheet, it is possible to prevent fading of an inkjet recorded image due to light, and also to use the inkjet recording sheet and the ultraviolet absorber. It has been found that an ink jet recording sheet storage file having good storability and transparency of the ink jet recording sheet can be obtained because it is possible to prevent coloring due to contact with the above, and the present invention has been completed.

That is, the inkjet recording sheet storage file of the present invention is an inkjet recording sheet storage file on which an image is formed by an inkjet printer, and the base material of the file is ASTM D1003.
It has a haze value of 10% or less, and a coating layer containing an ultraviolet absorber of 1 mg / m ² or more is provided on the non-contact surface with the recording sheet.

The ink jet recording sheet storage file of the present invention will be described in detail below.

In the present invention, the base material of the file for storing the ink jet recording sheet is ASTM D100.
A film having a haze value defined by 3 of 10% or less is preferable. When the haze value of the film exceeds 10%,
Since the transparency of the file is lowered, it is difficult to observe the image in detail when the inkjet recording sheet is stored in the file.

Examples of such a film include polyethylene film, polypropylene film, polyester film, polyamide film, polyvinyl chloride film,
Polyvinylidene chloride film, polystyrene film,
Polycarbonate film, polysulfone film,
An acetate film or the like can be used.

The thickness of the film is preferably about 20 to 100 μm from the viewpoint of handleability and cost.

Examples of the ultraviolet absorber added to the coating layer provided on the surface of the base material which is not in contact with the ink jet recording sheet are, for example, 2,4-dihydroxybenzophenone and 2
-Hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 4-dodecyloxy-2-hydroxybenzophenone, 2-hydroxy-4-octadecyloxybenzophenone, 2,2 '
-Dihydroxy-4-methoxybenzophenone, 2,
2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2 ', 4,4'-tetrahydroxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, 2-hydroxy-4-methoxy-2' −
Benzophenone compounds such as carboxybenzophenone and 2-hydroxy-4-chlorobenzophenone, 2
(2'-hydroxy-5'-methylphenyl) benzotriazole, 2 (2'-hydroxy-3 ', 5'-di-
t-butylphenyl) benzotriazole, 2 (2'-
Benzotriazole compounds such as hydroxy-3′-t-butyl-5′-methylphenyl) benzotriazole, salicylates such as phenyl salicylate, p-octylphenyl salicylate, and p-t-butylphenyl salicylate. Examples of the compound include resorcinol monobenzoate, 2′-ethylhexyl-2-cyano-3-phenylcinnamate and the like.

The amount of the ultraviolet absorber added to the coating layer provided on the surface of the substrate which is not in contact with the ink jet recording sheet is 1
It is preferably at least mg / m ² . Here, if the added amount is less than 1 mg / m ² , the ultraviolet ray blocking effect is low, and the light resistance of the inkjet recorded image is lowered when stored in the inkjet recording sheet storage file.

In the present invention, the coating layer provided on the surface of the base material which is not in contact with the ink jet recording sheet is an organic solvent containing the above UV absorber together with a binder, an antistatic agent, a crosslinking agent, a plasticizer, a surfactant and the like. Alternatively, it is dissolved or dispersed in water and applied to the substrate.

For example, as the binder, an organic solvent-soluble resin such as polyurethane, polyester, polyvinyl chloride, polyamide, polyether and polycarbonate,
Water-soluble resins such as polyvinyl alcohol, starch, gelatin and casein, resin emulsions such as polyacrylic acid ester type resin emulsions, polyvinyl acetate type resin emulsions, styrene / acrylic type resin emulsions and styrene / butadiene resin emulsions can be used.

As the antistatic agent, inorganic salts such as sodium chloride and potassium chloride, organic antistatic agents such as polyethylene glycol type, polystyrene sulfonic acid type, polyacrylic acid ester type, etc., and melamine / Formalin resin, urea resin, polyamide resin, polyethyleneimine resin, epoxy resin, etc., plasticizers such as phthalic acid ester, trimellitic acid ester, pyromellitic acid ester, etc., and surfactants such as anionic surfactant, cation. A cationic surfactant, an amphoteric surfactant, a nonionic surfactant and the like can be used.

The coating layer containing such an ultraviolet absorber can be formed by a gravure method, a reverse roll method, a wire bar method,
The base material can be coated by a general coating method such as an extrusion die method, a comma method, a curtain method, an air knife method, and a slide hopper method.

In the present invention, for the purpose of preventing blocking of the ink jet recording sheet and the file for storing the ink jet recording sheet, the surface of the substrate which is in contact with the ink jet recording sheet is electrically conductive or separated from the surface of the base material so long as the effect of the present invention is not impaired. A coating layer can be provided to impart moldability.

Such a coating layer includes a pigment, a binder, a dispersant, a surfactant, an antistatic agent, a cross-linking agent, a plasticizer, and a pH.
General agents such as gravure method, reverse roll method, wire bar method, extrusion die method, comma method, curtain method, air knife method, slide hopper method, etc. The base material can be applied by a coating method.

[0023]

In the present invention, when a film having a low haze value is used as the base material and a coating layer containing an ultraviolet absorber is provided on the surface of the base material that is not in contact with the ink jet recording sheet, the ultraviolet ray blocking effect causes In addition to preventing the fading of the ink jet recording image stored in the ink due to light, by preventing the ink jet recording sheet from contacting with the ultraviolet absorbent, it is possible to prevent the coloring due to the reaction between the components in the ink receiving layer and the ultraviolet absorbent. As a result, an inkjet recording sheet storage file having excellent storability and transparency of the inkjet recording image can be obtained.

[0024]

The present invention will be described in more detail by way of examples, but the contents of the present invention are not limited to these.

Example 1 A polyethylene terephthalate film having a haze value of 1.8% and a thickness of 50 μm was coated on one side with a gravure coater to give a coating solution having the following composition in a dry coating amount of 0.53 g /
It was coated and dried so as to be m ² . Then, the surface provided with the coating layer of this film was folded in two, and two of three sides were glued to prepare an inkjet recording sheet storage file. (Coating layer coating liquid formulation 1) Polycarbonate resin 98 parts by weight 2,4-Diethyloxybenzophenone 1 part by weight Polyethylene glycol antistatic agent 1 part by weight Toluene 150 parts by weight Methyl ethyl ketone 150 parts by weight

Example 2 In Example 1, the substrate was made to have a haze value of 3.9% and a thickness of 50.
An inkjet recording sheet storage file was prepared in exactly the same manner as in Example 1 except that the polypropylene film was changed to a μm polypropylene film.

Example 3 In Example 1, the substrate was made to have a haze value of 9.6% and a thickness of 50.
Example 1 except that the polyethylene film was changed to μm.
A file for storing an inkjet recording sheet was prepared in exactly the same manner as in.

Example 4 An ink jet recording sheet storage file was prepared in the same manner as in Example 1 except that the coating liquid for the coating layer was changed to the following composition. (Coating layer coating solution formulation 2) Poly vinyl chloride resin 80 parts by weight Dioctyl phthalate 15 parts by weight 2 (2'-Hetoxy-5-methylphenyl) benzethriasol 5 parts by weight Toluene 150 parts by weight Methyl ethyl ketone 150 parts by weight

Example 5 An ink jet recording sheet storage file was prepared in the same manner as in Example 1 except that the coating liquid for the coating layer was changed to the following composition. (Coating layer coating composition 3) Polyurethane resin 85 parts by weight Phenyl salicylate 15 parts by weight Toluene 150 parts by weight Methyl ethyl ketone 150 parts by weight

Example 6 An ink jet recording sheet storage file was prepared in the same manner as in Example 1 except that the coating liquid for coating layer was changed to the following composition. (Coating liquid for coating layer 4) Polyacrylic acid ester resin emulsion 99 parts by weight 2'-ethylhexyl-2-cyano-3-phenylcinnamate 1 part by weight

Example 7 In Example 1, the dry coating amount of the coating liquid for the coating layer was 0.11.
An inkjet recording sheet storage file was prepared in the same manner as in Example 1 except that the file was set to g / m ² .

Comparative Example 1 A polyethylene terephthalate film having a haze value of 1.8% and a thickness of 50 μm was folded in two, and two of the three sides were glued to prepare an ink jet recording sheet storage file.

Comparative Example 2 A semi-transparent polyvinyl chloride film having a haze value of 30.2% and a thickness of 50 μm and having irregularities on the surface is folded into two and 3
Two of the sides were glued to prepare an inkjet recording sheet storage file.

Comparative Example 3 In Example 1, the substrate was made to have a haze value of 12.5% and a thickness of 5.
An inkjet recording sheet storage file was prepared in the same manner as in Example 1 except that the polyethylene film was changed to 0 μm.

Comparative Example 4 An ink jet recording sheet storage file was prepared in the same manner as in Example 1 except that the coating liquid for coating layer was changed to the following composition. (Coating layer coating liquid formulation 5) Polycarbonate resin 99.9 parts by weight 2,4-dihydroxybenzophensophenone 0.1 part by weight Toluene 150 parts by weight Methyl ethyl ketone 150 parts by weight

Comparative Example 5 In Example 1, the dry coating amount of the coating liquid for the coating layer was 0.08.
An inkjet recording sheet storage file was prepared in the same manner as in Example 1 except that the file was set to g / m ² .

Comparative Example 6 In Example 1, a file for storing an ink jet recording sheet was prepared by folding the film in two with the surface provided with the coating layer inside and gluing two of the three sides.

Comparative Example 7 In Example 5, a file for storing an ink jet recording sheet was prepared by folding the film in two with the surface on which the coating layer was provided being inside and gluing two of the three sides.

In order to evaluate the performance of the ink-jet recording sheet storage file produced as described above, a 100 μm thick polyethylene terephthalate film was coated on both sides with an ink receiving layer coating solution having the following composition in a dry coating amount. An inkjet recording sheet coated and dried to have a weight of 5 g / m ² was used. (Ink receiving layer coating liquid formulation) Carboxymethyl cellulose 100 parts by weight Colloidal silica 10 parts by weight Sulfosuccinic acid octyl ester 1 part by weight Water 889 parts by weight

The performance of the file for storing the ink jet recording sheet was evaluated by the following method.

(Lightfastness of Inkjet Recorded Image) An inkjet recording sheet printed by using a Hewlett Packard desk writer 550C inkjet printer is put in a file for storing an inkjet recording sheet, and an irradiation amount is measured using an Atlas Ci35 weatherometer manufactured by Toyo Seiki. A light fastness test was carried out under the conditions of 0.38 W / m ² and an irradiation time of 48 hours, and the ratio of the optical density before and after the light fastness test in the black image area was obtained, and this was converted into a percentage and evaluated.

(Coloring of Inkjet Recording Sheet) An inkjet recording sheet printed by using a Hewlett Packard desk writer 550C inkjet printer was put in an inkjet recording sheet storage file and stored for 2 weeks at 30 ° C. and 80% RH. ,
The coloring state in the non-image area of the ink jet recording sheet was visually observed. When little coloration was observed, it was evaluated as ◯, when a little coloration was recognized as Δ, and when it was markedly colored as x.

(Transparency) An ink jet recording sheet printed by using a Hewlett Packard desk writer 550C ink jet printer was put in a file for storing the ink jet recording sheet, and the image on the ink jet recording sheet was visually observed, and the file was free from fogging. When the image could be observed in detail, it was evaluated as ◯, and when it was slightly clouded and it was a little difficult to observe the detailed image, it was evaluated as Δ, and when it was too cloudy to observe the detailed image and could not be used, it was evaluated as x.

The results of the above evaluations are summarized in Table 1.

[0045]

[Table 1]

As is clear from Table 1, the ink jet recording sheet storage files of Examples 1 to 7 were good in light resistance and transparency of ink jet recorded images, and the ink jet recording sheets were not colored. However, in the inkjet recording sheet storage file of Comparative Example 1, since the coating layer containing the ultraviolet absorber was not provided, the light resistance of the inkjet recorded image was deteriorated. The ink jet recording sheet storage file of Comparative Example 2 uses a semi-transparent polyvinyl chloride film having irregularities on the surface as a base material and does not have a coating layer containing an ultraviolet absorber, and thus has low transparency. The light resistance of the ink jet recorded image was also reduced. The file for storing the inkjet recording sheet of Comparative Example 3 is
Since a polyethylene film having a high haze value was used as the base material, the transparency was lowered, and it was difficult to observe the image in detail when the inkjet recording sheet was put in the file. In the inkjet recording sheet storage files of Comparative Examples 4 to 5, since the amount of the ultraviolet absorber contained in the coating layer was too small, the light resistance of the inkjet recorded image was deteriorated. In the inkjet recording sheet storage files of Comparative Examples 6 to 7, since the coating layer containing the ultraviolet absorber was applied to the surface of the substrate in contact with the inkjet recording sheet, the components of the ink receiving layer of the inkjet recording sheet and the ultraviolet absorption were absorbed. Coloring due to the reaction of the agent was observed.

[0047]

According to the present invention, a film having a low haze value is used as a substrate, and a coating layer containing a specific amount of an ultraviolet absorber is provided on the surface of the substrate which is not in contact with the ink jet recording sheet. Thereby, an inkjet recording sheet storage file having good storage stability and transparency of the inkjet recording image can be obtained.

Claims (1)

[Claims] 1. A file for storing an inkjet recording sheet on which an image is formed by an inkjet printer, wherein the base material of the file has a haze value of 10% or less defined by ASTM D1003, and a non-contact surface with the recording sheet. A file for storing an ink jet recording sheet, characterized in that a coating layer containing 1 mg / m ² or more of an ultraviolet absorber is provided on the above.