JP2000272222A - Recording material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To outdoor display a recorded material printed by a back print type by an ink jet type by giving ultraviolet barrier properties to a transparent base material in the material having an ink receptive layer provided on the base material. SOLUTION: In the recording material having an ink receptive layer provided on a transparent base material, if a material to become a base material of the recording material of a back print type is transparent, the material is not particularly limited. For example, a plastic, glass or the like is used. The transparent base material needs to have ultraviolet barrier properties. The barrier properties mean to shut off a light having a wavelength of 350 μm by 90% or above. To give the ultraviolet barrier properties, it is necessary to contain an ultraviolet absorbent in the material. As the absorbent, inorganic particles such as titanium oxide, zinc oxide, cerium oxide or the like, organic particles such as salicylic acid, benzophenone, benzotriazole, cyanoacrylate or the like is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a recording material suitable for an ink jet recording system. More particularly, the present invention relates to a light-resistant recording material that can be displayed outdoors in a back-printing recording material having a printing surface and a viewing surface different from each other.

[0002]

2. Description of the Related Art In recent years, with the improvement of computer performance and the spread of computers, hard copy technology has rapidly developed. As a recording method of a hard copy, a method such as a sublimation transfer recording method, an electrophotographic method, and an ink jet method is known.

[0003] Ink jet printers are
In this method, ink droplets are ejected at high speed from nozzles toward recording paper. In recent years, it has been rapidly becoming popular as a terminal for offices, homes, personal computers, and the like because of its ease of colorization and miniaturization and low printing noise. Furthermore, the application to industrial fields such as large signboards is expected because of the improvement in printing quality and the ease of upsizing that approach silver halide photography.

[0004] Printing by the ink-jet method is greatly affected not only by the performance of the hardware but also by the properties of the recording material, and various recording materials have been developed. Among them, a so-called back print type recording material has been proposed in which an ink absorbing layer and an ink passing layer are laminated on a light-transmitting substrate, printed from the ink passing layer side, and viewed from the substrate side. Fair 5-50
396, 73586, 76435). This method has a feature that a recorded matter having excellent water resistance can be obtained since the viewing surface is from the base material side.
However, when exhibited outdoors, light causes fading of the dye or pigment.

[0005]

SUMMARY OF THE INVENTION The present invention provides a recording material which solves the above-mentioned drawbacks, that is, a recording material printed by a back print method can be displayed outdoors.

[0006]

Means for Solving the Problems As a result of intensive studies made by the present inventor, it has been found that, in a recording material in which an ink receiving layer is provided on a light-transmitting substrate, the above-mentioned object is achieved by the fact that the light-transmitting substrate has ultraviolet blocking properties. Was achieved. Hereinafter, the present invention will be described in detail.

In the present invention, the substrate is not particularly limited as long as it is translucent, and examples thereof include a plastic film and glass. Among these, a plastic film is preferable from the viewpoint of flatness, strength, heat resistance and cost. Examples of the plastic film include vinyl chloride, ester, acrylic, olefin and the like, and any two or more of these may be used by laminating them.

In the present invention, it is necessary that the light-transmitting substrate has ultraviolet blocking properties.

In the present invention, having an ultraviolet blocking property means that light having a wavelength of 350 nm can be blocked by 90% or more.

In the present invention, transparency means that the total light transmittance has a property of 80% or more.

[0011] In order to impart ultraviolet blocking properties, it is necessary to include an ultraviolet absorber in the translucent substrate.

Examples of the ultraviolet absorber include inorganic particles such as titanium oxide, zinc oxide, iron oxide and cerium oxide, and organic compounds such as salicylic acid, benzophenone, benzotriazole and cyanoacrylate. The ultraviolet absorber is preferably contained on the transparent substrate, but may be contained in only one layer when the substrate has two or more layers.

In the present invention, it is preferable to provide an anchor layer between the substrate and the ink receiving layer. The adhesion to the ink receiving layer is further improved by the anchor layer.

Examples of the resin constituting the anchor layer include polyester resins, polyurethane resins, acrylic resins, melamine resins and vinylidene chloride resins.

As a method for providing the anchor layer, any known method can be applied, and as a coating method, a roll coating method, a gravure coating method, a roll brushing method, a spray coating method, an air knife coating method, a bar coating method, a blade coating method, or the like. The method, the impregnation method, the curtain coating method and the like are applied alone or in combination.

As the anchor layer, it is preferable to apply 0.01 g / m ² or more and 1 g / m ² or less. 0.01
When the amount is less than g / m ² , the function as an anchor layer is not exhibited. Conversely, if it is too large, the cost will increase.

Various additives may be added to the anchor layer to such an extent that adhesion and transparency are not impaired. For example, fluorescent dyes, plasticizers, ultraviolet absorbers, inorganic pigments, organic pigments,
Examples include a surfactant and a cationic polymer.

In the present invention, a recording material can be obtained by providing an ink absorbing layer and an ink passing layer on such a transparent film. The ink absorbing layer is a layer having a function of quickly absorbing and fixing dyes, pigments, moisture, and the like in the ink after the ink applied to the surface of the ink passing layer passes through the ink passing layer. The ink passage layer is a layer having a function of guiding the ink applied to the surface to the lower ink absorbing layer without absorbing and fixing the ink.

Various ink absorbing layers can be suitably used. Swellable absorption layer mainly composed of water-soluble or water-swellable polymer, absorption layer of porous structure composed of particles and binder by capillary action, both swelling and capillary composed of water-absorbing polymer particles and binder Can be exemplified. Among them, those having a porous structure are preferable. The porous structure allows the pigment to penetrate into the absorption layer when printing with pigment ink.

In the above case, the particles include silica, kaolinite, talc, calcium carbonate, zeolite, alumina, barium sulfate, carbon black, zinc oxide,
Examples include particles of titanium oxide, organic white pigment, benzoguanamine particles, crosslinked polystyrene, crosslinked acrylic particles, aluminum hydroxide, and the like. Examples of the binder include polyvinyl alcohol, acrylic resin, styrene-acryl polymer, ethylene-vinyl acetate polymer, starch, polyvinyl butyral, gelatin, casein, ionomer, gum arabic, carboxymethyl cellulose, polyvinyl pyrrolidone, polyacrylamide, and polyester resin. ,
One or more of resins such as styrene-butadiene rubber and modified resins thereof can be used as desired.

In the above case, as the water-absorbing polymer, a polymer having an absorption capacity of several tens times or more of its own weight can be suitably used. For example, a cellulose type, a starch type, a polyacrylate type, a polysulfonic acid copolymer type, a maleic anhydride type, a polyvinyl alcohol type, a polyacrylamide type, a polyoxyethylene type, a quaternary ammonium salt type may be used. Among them, the water-absorbing polymer is preferably present as particles in the membrane structure. The binder is necessary for binding the water-absorbing polymer, and examples thereof include polyester-based, acrylic-based, and urethane-based binders.

Various additives may be added to the ink absorbing layer to such an extent that the ink absorbing ability and other physical properties are not impaired. For example, fluorescent dyes, plasticizers, ultraviolet absorbers, inorganic pigments, organic pigments, surfactants, cationic polymers and the like can be mentioned.

The method of providing the ink absorbing layer is not particularly limited, but includes a gravure coat method, a kiss coat method, a dip method, a spray coat method, a curtain coat method, an air knife coat method, a blade coat method,
A commonly used method such as a reverse roll coating method or a bar coating method can be applied. The coating amount is not particularly limited, but is preferably 1 g / m ² to 50 g / m ² . If the coating amount is small, the ink absorption amount will be insufficient,
On the other hand, if the number is too large, there is no problem in performance, but there is a problem that cost is increased.

In the recording material of the present invention, it is necessary to provide an ink passage layer on the ink absorption layer. The ink passage layer is mainly composed of particles and a binder, and is preferably porous. Particles include silica, kaolinite, talc, calcium carbonate, zeolite, alumina, barium sulfate, carbon black, zinc oxide, titanium oxide, organic white pigments, benzoguanamine particles, crosslinked polystyrene, crosslinked acrylic particles, particles of aluminum hydroxide, etc. But
Organic particles that do not adsorb moisture are preferred.

The binder for binding the above particles is preferably a resin which is hardly soluble in water. For example, polyester resin, polyacrylic resin, polyurethane resin,
Melamine-based resins and various copolymers can be mentioned, and a water-repellent acrylic resin or acrylic-styrene copolymer which does not easily adsorb moisture is preferable.

The ratio of the particles to the binder is 2/1 to 20 /
It is preferably between 1. More preferably, 3/1 to
15/1. If the amount of the particles is small, the gap between the particles is filled, and it becomes difficult for ink to pass through. Conversely, if the amount of particles is too large, the strength of the layer will decrease.

Various additives may be added to the ink passage layer to such an extent that the ink absorbing ability and other physical properties are not impaired. For example, fluorescent dyes, plasticizers, ultraviolet absorbers, inorganic pigments, organic pigments, surfactants, cationic polymers and the like can be mentioned.

The method of providing the ink passage layer is not particularly limited, but includes a gravure coating method, a kiss coating method, a dip method, a spray coating method, a curtain coating method, an air knife coating method, a blade coating method,
A commonly used method such as a reverse roll coating method or a bar coating method can be applied. The coating amount is not particularly limited, but it is preferable to provide a concealing property such that the pattern of the wall is not visible when the recording medium is attached to a wall or the like, and the light transmittance is 60% or less. Is preferred. To achieve this light transmittance, the coating amount after drying is 5 g /
It is preferably at least m ² . Conversely, if the coating amount is too large, the ink passage process becomes too long, resulting in poor color development. Therefore, the coating amount is preferably 20 g / m ² after drying.

The ink used for the recording material of the present invention can be any water-based ink containing water as a main component.
A recording agent for forming an image and a liquid medium (main component of which is water) for dispersing or dissolving the recording agent may be used. Various dispersants, surfactants, viscosity modifiers, and specific resistance adjusters are used as necessary. An agent, a pH adjuster, a fungicide, a dissolution or dispersion stabilizer for the recording agent, and the like may be added. As the recording agent, direct dyes, reactive dyes, acid dyes, basic dyes, food dyes, disperse dyes, and various pigments can be used.

Printing was performed using the recording material thus obtained, and the recorded matter was less fading of the ink when displayed for a long period of time outdoors.

[0031]

Next, examples of the present invention and comparative examples will be described. First, a measurement / evaluation method used in the present invention will be described below.

Printing Dye type ink jet printer (design jet 2500 manufactured by Hewlett-Packard Japan, Inc.)
CP) and genuine dye ink. Printing was performed using a pigment type ink jet printer (CAMM JET-70 manufactured by Roland DG) and genuine pigment ink.

Weather Resistance The light was applied from the substrate side of the recording material printed by the above method (1) in a cycle of 4 hours / 4 hours using a weather resistance tester (Atlas Yubucon UC-1 manufactured by Toyo Seiki Co., Ltd.). Irradiation / non-irradiation was repeated and observed after a total of 100 hours.

Example 1 A highly weather-resistant polyester film (HB-100μ manufactured by Teijin) kneaded with an ultraviolet absorber was used as a transparent film, and the following anchor layer was applied to the film.

Anchor layer A coating solution having the following solid content ratio was bar-coated,
It dried at 2 degreeC x 2 minutes, and formed the anchor layer. The dry coating amount at this time was 0.5 g / m ² . -10 parts by weight of water-dispersed polyester resin (Vylonal MD-1200 manufactured by Toyobo Co., Ltd.)-3 parts by weight of colloidal silica (Snowtex-O manufactured by Nissan Chemical Co., Ltd.)-Surfactant (Paintad 32 manufactured by Dow Corning Co., Ltd.) 0.1 parts by weight The following ink absorbing layer and ink passing layer were formed on the above anchor layer to obtain a recording material.

Ink absorbing layer A coating solution having the following solid content ratio was bar-coated, and
It dried at 0 degreeC for 5 minutes, and formed the absorption layer. The dry coating amount at this time was 15 g / m2. 100 parts by weight of polyvinyl alcohol (GH-17, manufactured by Nippon Synthetic Chemical Co., Ltd.) 10 parts by weight of melamine resin (8% AC, manufactured by Sumitomo Chemical Co., Ltd.) Cationic compound (Kaya manufactured by Nippon Kayaku Co., Ltd.) Fix UR) 10 parts by weight Synthetic silica (Syloid 550, manufactured by Fuji Silysia Ltd.) 200 parts by weight Silicone surfactant (Paintad 57, manufactured by Dow Corning) 3 parts by weight

[0037] The coating solution consisting of solid content ratio below the ink passage layer the ink absorbing layer was bar-coated and dried for 1 minute at 120 ° C.. The coating amount at that time was 10 g / m ² .・ Acrylic resin (Ace Reset 270E manufactured by Nippon Shokubai Co., Ltd.) 10 parts by weight ・ Organic particles (Eposter MS manufactured by Nippon Shokubai Co., Ltd.) 100 parts by weight ・ Silicon surfactant (Paintad 57 manufactured by Dow Corning) 5 parts by weight

The recording material thus obtained was white and opaque. Ink jet recording was performed on this recording material. Next, as a result of performing a weather resistance test, there was no fading.

Example 2 As a light-transmitting substrate, a polyvinyl chloride film having a UV-blocking property (LAG protect G-002PV50 manufactured by Lintec)
A recording material was obtained in the same manner as in Example 1 except that a laminate was used in which a polyester film (Toyobo Cosmoshine A4100-50μ) having no ultraviolet blocking property was laminated. The anchor layer was provided on the polyester film side. The recording material thus obtained was white and opaque. Ink jet recording was performed on this recording material. Next, as a result of performing a weather resistance test, there was no fading.

COMPARATIVE EXAMPLE 1 In Example 1, a transparent polyester film containing no ultraviolet absorber as a light-transmitting substrate (HS-10 manufactured by Teijin Limited) was used.
Recording material was obtained in the same manner as in Example except that 0 μ) was used. Ink jet recording was performed on the obtained recording material, and then a weather resistance test was performed. As a result, clear fading occurred.

[0041]

According to the present invention, there is provided a recording material having high light resistance which can be used for outdoor exhibitions in a recording material used in a back print system.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshitake Suzuki 2-1-1 Katata, Otsu-shi, Shiga F-term in Toyobo Co., Ltd. Research Laboratory (reference) 2C056 EA13 FC06 2H086 BA13 BA15 BA17 BA41 4F100 AA20H AK41 AR00A AR00B AR00C BA03 BA07 BA10A BA10C CA07 CA18 EJ64 GB90 JD09B JD14B JD14C JD20C JN01A JN30

Claims (4)

[Claims] 1. A recording material comprising an ink receiving layer provided on a light-transmissive substrate, wherein the light-transmissive substrate has ultraviolet blocking properties. 2. The recording material according to claim 1, wherein the ink receiving layer is opaque. 3. The recording material according to claim 1, wherein the ink receiving layer comprises two layers: an ink absorbing layer and an ink passing layer. 4. The recording material according to claim 1, wherein the recording material is used in an ink jet recording system.