JP2008055686A - Method for producing sheet article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a sheet article which has a clear image on the surface and is excellent in physical properties although the drawn image is clear. <P>SOLUTION: The image drawn with UV curing pigments is formed on a polymer elastomer layer, and a water base polymer elastomer is applied after UV curing. Preferably, an image forming method is an inkjet method, the resolution of the image is at least 5 dots/mm, the polymer elastomer is a polyurethane, or the polymer elastomer layer is a wet polyurethane porous layer. Preferably, the polymer elastomer layer exists on a fibrous substrate, and the water base polymer elastomer is to be a surface layer, the polymer elastomer layer exists on release paper, the polymer elastomer on the release paper and the fibrous substrate are laminated by the water base polymer elastomer, and the release paper is peeled/removed, and the fibrous substrate has very thin fibers. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for producing a sheet-like product having a clear image on its surface, and more particularly to a method for producing a sheet-like product having excellent physical properties while having a clear image suitable for a leather-like sheet-like product.

  Conventionally, a leather-like sheet-like material having a polymer elastic layer on the surface, so-called silver-tone artificial leather, has been used for a wide variety of purposes, and various ideas have been made to express its appearance. For example, as a method for expressing the appearance, a method of applying a colored pattern by a conventionally known printing technique such as gravure printing or roller printing on the surface of a polymer elastic layer of a sheet-like material, a method of applying a colored pattern by transfer, or printing A method of applying a colored pattern by, for example, is employed. These designs are expressed on the surface of the elastic polymer layer by designs such as gravure rolls, engraving rolls, and printing screens. To change these colors and designs, engraving the design on the roll, Needs to repeat toning. Moreover, in these conventional methods, there is a limit to the range of expression and hue of the pattern, such as the restriction that only one color is colored in a single process, and it is a great deal to apply many delicate patterns to the surface of a sheet-like object. Had to spend money and time.

  On the other hand, in recent years, information patterns drawn on a computer by an ink jet printer can be printed in multiple colors in a short time in the printing field. This ink jet printing is characterized in that it can print various designs with various colors in a short time, unlike the conventional gravure printing, roller printing, transfer or textile printing described above. . However, unlike printing on paper, it is not easy to print on the surface of a sheet-like material comprising a polymer elastic layer, and various attempts have been made at present.

  For example, in Patent Document 1, an aqueous primer layer is formed on the surface of leather such as natural leather, a porous ink receiving layer containing alumina hydrate is further provided thereon, and the porous ink receiving layer is formed on the porous ink receiving layer. Describes leather products drawn by the inkjet method. However, the porosity in this leather product is a nanometer-order porosity that depends on alumina hydrate, and the ink receptivity (dyeability) of the porous ink receiving layer is not sufficient. Even when applied to the surface of the molecular elastic body layer, a fine and clear pattern is difficult to be formed, and the color tone of the pattern tends to be deep. Furthermore, in this method, the alumina hydrate constituting the porous ink-receiving layer is easily removed by friction, and is practically applicable only to leather-like sheets processed into sports shoes in terms of wear resistance. I didn't have it.

  Moreover, in patent document 2, the leather-like sheet | seat which draws by the inkjet system using the ink containing dye on the easily dyeable layer of a fibrous base material, and has a transparent or translucent protective layer on the drawn image The manufacturing method of this is proposed. However, since this leather-like sheet uses dye ink, it is not sufficient in light fastness, especially when processed and used in shoes for outdoor use, competition balls, or moss, There has been a drawback that a delicate and clear image obtained by the inkjet method cannot be retained for a long time. In addition, because the dye is used, when the leather-like sheet or shoes, balls, bags, gloves, etc. processed from the leather-like sheet contact each other, the dye migrates to the surface and comes into contact There was a problem of contaminating the opponent.

  In order to solve this problem, it is conceivable to use an ink made of a pigment instead of a dye as a colorant. This is because, when these pigment inks are employed in an ink jet system, it is considered that images can be retained for a long period of time even when used outdoors. However, when a pattern is applied to the surface of leather using pigment ink, the adhesion between the layer on which the pattern is applied and the adjacent layer becomes extremely weak due to pigment particles that hinder the adhesion. was there. In particular, when a leather-like sheet-like material is processed and molded into shoes, bags, etc., problems such as peeling of the bent portion or dropping of the image of the bent portion have occurred. That is, the present situation is that a method for producing a sheet-like material that has a fine image on the surface and can withstand practical use has not been obtained.

JP 9-59700 A Japanese Patent Laid-Open No. 11-158782

  An object of the present invention is to provide a method for producing a sheet-like product having a clear image on the surface and having excellent physical properties while the drawn image is clear.

The method for producing a sheet-like material of the present invention is characterized in that an image made of a UV curable pigment is formed on a polymer elastic layer, and a water-based polymer elastic material is applied after UV curing.
Furthermore, the image forming method is an inkjet method, the resolution of the image is 5 dots / mm or more, the polymer elastic body is polyurethane, or the polymer elastic body layer is a wet polyurethane porous layer. It is preferable that

  Also, the polymer elastic layer is present on the fibrous base material, and the water-based polymer elastic body is the surface layer, or the polymer elastic layer is present on the release paper and the water-based polymer elastic layer is present. It is preferable that the polymer elastic body layer on the release paper and the fibrous base material are bonded to each other by the body, and then the release paper is peeled and removed, and the fibrous base material preferably has ultrafine fibers. .

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the sheet-like thing which has a clear image on the surface and was excellent in the physical property is provided while the drawn image is clear.

The present invention is described in detail below.
In the method for producing a sheet-like product of the present invention, it is essential to form an image made of a UV curable pigment on a polymer elastic body layer, and apply an aqueous polymer elastic body after UV curing the image.

  Examples of the polymer elastic body as a base on which an image is formed include polyurethane, polyester elastomer, polyamide elastomer, polyolefin elastomer, or synthetic rubber such as polybutadiene and polyisoprene. Among these, polyurethane is preferable from the viewpoints of wear resistance, elastic recovery, flexibility and the like. Further, the thickness is preferably about 0.05 mm to 1.5 mm in order to obtain sufficient physical properties.

The layer made of the polymer elastic body may be nonporous, but is preferably a porous layer, and particularly preferably a wet polyurethane porous layer. In the case of the same thickness, the porous material has a reduced density and improved texture. The density is preferably in the range of 0.20 to 0.70 g / cm ³ , more preferably 0.3 to 0.5 g / cm ³ . As the kind of the porous material, a communicating hole or an independent hole may be used.

  As the polyurethane that can be preferably used for the polymer elastic body layer, those used for artificial leather are preferable. For example, a conventionally known thermoplastic polyurethane obtained by polymerization reaction of organic diisocyanate, polymer diol and chain extender. Can be mentioned. Organic diisocyanates include aliphatic, alicyclic or aromatic diisocyanates containing two isocyanate groups in the molecule, especially 4,4′-diphenylmethane diisocyanate, P-phenylene diisocyanate, toluylene diisocyanate, 1,5-naphthalene diisocyanate, Examples include xylylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, and the like. Examples of the polymer diol include at least one of polyester glycol obtained by condensation polymerization of glycol and aliphatic dicarboxylic acid, polylactone glycol obtained by ring-opening polymerization of lactone, aliphatic or aromatic polycarbonate glycol, or polyether glycol. Examples include polymer glycols having an average molecular weight of 500 to 4000 selected from seeds. Examples of chain extenders include diols having a molecular weight of 500 or less containing two hydrogen atoms capable of reacting with isocyanate, such as ethylene glycol, 1,4 butanediol, hexamethylene glycol, xylylene glycol, cyclohexanediol, and neopentyl glycol. Can be mentioned.

  As a method for obtaining a preferable porous layer using such a polymer elastic body, a conventionally known method can be employed. For example, a so-called wet coagulation in which polyurethane is dissolved in an organic solvent that is a good solvent for polyurethane and compatible with water, and this polyurethane solution is coated on a support with an arbitrary thickness, and is immersed in a water bath to be porously solidified. Or a solution in which polyurethane is dissolved or dispersed in an organic solvent in which polyurethane is not compatible with water but can be dissolved or dispersed, or a dispersion is coated on a support with an arbitrary thickness, while preventing water evaporation Dry porous molding method that selectively evaporates organic solvent, or thermally expandable fine particle capsules dispersed in polyurethane aqueous solution or water dispersion, coated on support with arbitrary thickness, and thermally expandable capsules while drying Or a prepolymer and a polymer having alcoholic hydrogen at the molecular end of the polyurethane. A method in which a socyanate and water are mixed and immediately coated on a support with an arbitrary thickness, or a method in which an inert gas is dispersed in molten polyurethane to coat and foam on a support with an arbitrary thickness, or Examples thereof include a method in which a polyurethane solution or dispersion mixed with a chemical foaming agent is coated on a support with an arbitrary thickness. Among these, a wet polyurethane porous layer formed by a wet coagulation method is preferable for easily controlling the shape of the pores and obtaining a porous structure.

  Moreover, when the polymer elastic body layer used by this invention is porous, it is also a preferable aspect to have a hole by methods, such as surface grinding and melt | dissolving an outermost layer with a solvent. When the polymer elastic layer is a smooth surface without apertures, it has the advantage that a finer image can be easily formed, whereas when it has apertures, the pigment constituting the image contains the inside of the apertures. It is possible to prevent the deterioration of physical properties such as adhesion due to the pigment.

  The method for producing a sheet-like material of the present invention forms an image made of a UV curable pigment on such a polymer elastic body. The UV curable pigment used in the present invention is not particularly limited as long as it is cured by irradiation with ultraviolet rays, but is generally composed of a monomer, a prepolymer, a photocuring initiator, and a pigment. This UV curable pigment is a type of pigment that is cured by a photopolymerization reaction in which a photocuring initiator converts a monomer into a polymer when irradiated with ultraviolet rays, and an acrylic resin or the like is generally used as the polymer. In addition, UV curable pigments, which are liquid resin monomers and prepolymers, are the dispersion medium for pigments, so they are clear from ordinary organic solvent pigments and water pigments that contain almost no solvent and a large amount of organic solvents and water as solvents. Are distinguished. The image formed in the present invention is thus composed of a UV curable pigment. However, by using a pigment type ink, the particles are larger than the dye type ink, so that the light resistance and the color transfer are excellent. Unlike organic solvent pigments, UV curable pigments do not hinder the adhesion between the polymeric elastic layers.

  Moreover, in the manufacturing method of the sheet-like material of this invention, it is preferable that the method of forming an image is an inkjet method, and the resolution of the image is 5 dots / mm or more. Further, the image resolution is preferably an image having a resolution of 10 dots / mm to 100 dots / mm. The manufacturing method according to the present invention is optimal because an image with such a fine resolution is printed and blurring of the image does not occur. More specifically, this image can be obtained by using an inkjet printer of 360 dots / inch or 720 dots / inch. The design can be arbitrarily selected, and even characters, photographs, design drawings, etc. can be applied. The ink jet printer may be any ink jet printer that can use UV curable pigment type ink. Based on data sent from an image development unit of a computer, an image made of a UV curable pigment is formed on the elastic polymer layer. The pattern is printed on the surface of the sheet-like material.

  In the production method of the present invention, it is essential to apply an aqueous polymer elastic body to the surface on which the image is formed after the image is formed and the pigment is UV cured. Since an aqueous polymer elastic polymer is applied instead of an organic solvent, the image can be kept extremely clear. Further, in order to maintain the clearness of the image, the polymer elastic body is preferably transparent or translucent. An aqueous polymer is a polymer elastic body emulsified and dispersed as an aqueous solution or dispersion of a polymer elastic polymer, and does not contain an organic solvent or contains a trace amount of polymer elastic solution. I point to. Examples of such a polymer elastic body polymer include polyurethane, polyester, polyester elastomer, polyamide, polyethylene, polypropylene, polyvinyl chloride, and polyvinylidene chloride. Among these, polyurethane is preferable from the viewpoint of physical properties.

  The present invention forms a transparent or semi-transparent polymer layer as a protective layer by applying a water-based polymer elastic body on the image-formed surface to prevent image cracks such as pattern collapse and bending. Is. As a method of forming a protective film layer with a polymer, an aqueous solution of a polymer or an aqueous dispersion capable of forming a protective film is directly coated on the surface of a sheet-like material having an image by an ink jet method, and then dried. A coating method or a film obtained by previously coating a release paper with a polymer solution or dispersion and then drying it is bonded to the surface of the sheet-like material having an image on the surface of the present invention with an aqueous adhesive. A so-called laminating method can be employed.

  More specifically, for example, knife coating, roll coating, spraying, or gravure coating is employed as the coating method, and as the laminating method, for example, a polymer elastic film is previously formed on the release paper, and the layer is formed. And a sheet-like material on which an image is formed are bonded by an adhesive made of an aqueous polymer. The thickness of the aqueous polymer applied is preferably 0.01 mm or more, and more preferably about 0.02 to 1 mm.

  With this water-based polymer elastic body, in the present invention, an image drawn with a UV curable pigment on the surface of a sheet-like material can be highly protected, and the wear resistance and color transfer resistance of the surface of the sheet-like material are improved. If the polymer elastic body solution to be applied here is an organic solvent-based solution instead of a water-based one, the remaining ink monomer components are dissolved by the organic solvent even if the UV-cured pigment has been cured. Or, the shape of the pattern that was finely and delicately swelled collapses and the fine clarity is lost. Even if the shape of the pattern is maintained to some extent, when the sheet-like material is bent, the pigment layer on which the pattern is drawn cracks and bends, so it can withstand practical use in applications such as artificial leather. It will not be possible. Therefore, in the production method of the present invention, it is essential that the polymer elastic body solution is water-based, and the solution does not contain any organic solvent at all, or even if it contains a trace amount. is necessary.

  In the present invention, it is also preferable to have a polymer elastic body layer on the outer side of the surface formed by applying a water-based polymer elastic body. Such a polymer elastic body layer can improve the physical properties and texture of the sheet-like material. Examples of the polymer elastic body used include polyurethane, polyester, polyester elastomer, polyamide, polyethylene, polypropylene, polyvinyl chloride, and polyvinylidene chloride.

  Such a polymer elastic body layer may be formed by forming a polymer elastic body layer on a release paper and adhering it with an adhesive, or after forming a sheet having an image once on the surface thereof. There is a method of coating an organic solvent solution, organic solvent dispersion, aqueous solution, or water dispersion, followed by drying, and the coating method may be knife coating, roll coating, spraying, gravure coating, or the like. it can.

The method for producing a sheet-like material of the present invention is as described above, and the polymer elastic body layer having this image is preferably present on the fibrous base material. A leather-like sheet having an image formed thereon can be obtained.
More specifically, for example, a polymer elastic body layer is present on a fibrous base material, and an image made of a UV curable pigment is formed on the polymer elastic body layer. This is a method for producing a sheet-like material by applying a body so that the water-based polymer elastic body becomes a surface layer of the sheet-like material.

Alternatively, the polymer elastic layer is present on the release paper, and an image made of a UV curable pigment is formed on the polymer elastic layer, and a water-based polymer elastic body serving as an adhesive is applied after UV curing. By doing so, the polymer elastic body on the release paper and the fibrous base material are pasted together with the water-based polymer elastic body, and then the release paper is peeled and removed. In this case, the fibrous base material, the water-based polymer elastic body, and the polymer elastic body layer on which the image is formed are sequentially laminated. However, the surface on which the image of the polymer elastic body layer is formed is not the surface of the sheet-like material, but an interface with the water-based polymer elastic body serving as an adhesive.
Of course, it is needless to say that these sheet-like materials may be provided with another polymer elastic body on the outermost surface side.

  Here, as the fibrous base material used in the present invention, a fiber assembly or a composite fiber assembly in which this fiber assembly is impregnated with a polymer elastic body can be used and has been conventionally used for artificial leather. Those are preferred. The thickness is preferably 0.2 to 5 mm, more preferably 0.4 to 2.5 mm. Examples of the fiber assembly include non-woven fabrics and woven and knitted fabrics. Examples of the fibers constituting them include synthetic fibers such as polyester and polyamide, natural fibers such as cotton, hemp, and wool, or semi-synthetic fibers such as rayon. Moreover, these may be mixed 2 or more types.

  Furthermore, it is preferable that the fibrous base material contains ultrafine fibers. Such a fibrous base material uses a nonwoven fabric entangled with fibers having a single fiber fineness of 0.3 dtex or less, and further 0.1 to 0.0001 dtex as a fiber aggregate. By reducing the fineness of the single fiber, the surface of the obtained fibrous base material becomes smooth, and a fine pattern drawn by the ink jet method or the like can be more enhanced. Such a fiber having a single fiber fineness can be produced by a conventionally known method, and examples thereof include a sea-island spinning method, a mixed spinning method, and a split-type composite spinning method in synthetic fiber production. These fibers are made into a non-woven fabric by opening a relatively thick parent fiber before ultra-thinning into short fibers, then using a conventionally known card machine, entanglement with a needle machine, etc. It becomes a nonwoven fabric made of fibers. Methods for ultrafinening include extracting or decomposing components other than ultrafine fibers from the parent fibers obtained by the sea-island spinning method and the mixed spinning method, and the parent fibers obtained by the split-type composite spinning method as mechanical A method of chemically or chemically dividing can be employed. Typical examples of the polymer component to be extracted or decomposed and removed include polyethylene, polypropylene, polystyrene, and copolymers thereof, and examples of the polymer component that becomes an ultrafine fiber include polyesters such as polyethylene terephthalate and polyethylene naphthalate, and nylon. 6, polyamides such as nylon 6,6 and the like. In order to produce efficiently, it is preferable to make ultrafine nonwoven fabrics by spinning the split composite spinning and forming it directly into a web, then entangled with a needle machine or the like and mechanically splitting.

  Examples of the composite fiber assembly composed of a fiber assembly and a polymer elastic body used as a fibrous base material include the above-described fiber assembly impregnated with a polymer elastic body, solidified, and dried. Examples of the polymer elastic body include polyurethane, polyester elastomer, polyamide elastomer, polyolefin elastomer, and synthetic rubber such as polybutadiene and polyisoprene. Among these, polyurethane is preferably used from the viewpoints of wear resistance, elastic recovery, flexibility and the like. These polymer elastic bodies are used for impregnation as solutions or dispersions dissolved or dispersed in organic solvents. Preferably, these polymers are used for impregnation as an aqueous solution or water dispersion for the protection of the global environment and the working environment.

  The fibrous base material may have a layer made of another polymer elastic body in advance on the surface to which the polymer elastic body for forming an image used in the production method of the present invention is applied. One of the preferred forms. The thickness is preferably 0.05 mm to 1.5 mm. When the thickness is 0.05 mm or less, the unevenness of the fibrous layer cannot be completely concealed and it is difficult to obtain surface smoothness. Moreover, when the thickness of the layer is 1.5 mm or more, the texture as the artificial leather becomes rubbery, which is not preferable.

  The layer made of the polymer elastic body may be nonporous, but is preferably a porous layer, and the same polymer elastic body that forms the image described above can be used. As the kind of the porous material, a communicating hole or an independent hole may be used. A porous layer made of a polymer can be formed directly on a fibrous base material by a coating method or the like, or a porous film made of polyurethane or the like created on a peelable support is used as a fibrous base material. You may bond together by an adhesive agent. Moreover, in the manufacturing method of this invention, it can also be used with the fibrous base material which does not have these high molecular polymer porous layers.

  The sheet-like material of the present invention thus obtained has a fine pattern using a UV curable pigment ink, and these patterns have no discoloration due to light, no dye migration, In addition, it has physical properties such as abrasion resistance and peel strength that can withstand various uses such as artificial leather. Since the image imparted to the sheet-like material of the present invention can be freely and easily expressed as a design on the surface of the sheet-like material, such as a design, a pattern, a photograph, etc., with a computer or the like connected to an inkjet printer. When applied to the surface of a fibrous base material to form a leather-like sheet, sports shoes, general shoes, various competition balls, binding materials, clothing, furniture, vehicles, etc. Even in applications, you can make use of your own designs that emphasize individuality.

  Hereinafter, the present invention will be described in detail by way of specific examples. In the examples, “parts” and “%” are based on weight, and the characteristic measurement values are obtained by the following method. In the following examples, light fastness, color transfer resistance, abrasion resistance and peel strength were measured by the following methods.

(Light fastness)
Observe the discoloration after carbon arc light irradiation for 50 hours in accordance with JIS-L0824. Grade 5 is the one with no change, and grade 1 is the one where the original design cannot be read. The original design was left but the fading color was judged as 3rd grade.

(Color resistance)
A surface of a leather-like sheet having a pattern printed by the ink jet method obtained in each example and comparative example on the surface, and a surface of a general white artificial leather having a surface formed of polyurethane, A6 size The color transition to the surface of the white artificial leather after observing the color transition to the surface of the white artificial leather after being allowed to stand in an atmosphere of 70 ° C. for 3 days with a uniform load of 2 kg was applied. The grade 5 was determined to be grade 1, and the white artificial leather colored almost on the entire surface was classified as grade 1 and those with an area of 30% to 50% colored as grade 3.

(Abrasion resistance)
In accordance with ASTM D-3886 method, HANDY ROLL P320J (manufactured by NORTON) was used as a sandpaper, and the number of times the exposed fiber layer of the worn part reached 10 mm in diameter.

(Stripping strength)
In accordance with JIS K6301 method, the film was peeled 100 mm at a pulling speed of 50 mm / min, and the average value of 5 minimum values for each 20 mm was represented by N / cm, and the peel strength was designated.

(Flexibility)
According to JIS K6545 method and JIS K6505 method, it was expressed as the number of times the surface was cracked, and was regarded as bending resistance.

[Example 1]
<Creation of fiber assembly>
Nylon-6 (intrinsic viscosity 1.1 in m-cresol) dried at 120 ° C. was fed to an extruder and melted. Separately dried polyethylene terephthalate (at an intrinsic viscosity of 0.64 in o-chlorophenol) at 160 ° C. was melted with an extruder separate from the foregoing. Subsequently, the nylon-6 mixture melt flow was introduced into a spin block maintained at 275 ° C. at a conduit polymer temperature of 250 ° C., the polyethylene terephthalate melt flow at 300 ° C., and a rectangular shape having hollow forming discharge holes in a lattice arrangement. The two polymer melt flows are combined using a spinneret, combined and discharged at a rate of 2 g / min. / Hole, and an air pressure of 0.35 MPa (spinning speed converted from the discharge rate and composite fiber fineness is about 4860 m / min). Towed at high speed. The pulled composite fiber is subjected to a high voltage application treatment at −30 kV, collided with a dispersion plate together with an air flow, opened, and a net conveyor as a web composed of a split split composite fiber having a 16-split multi-layer laminated cross section. Collected 1m wide above. Subsequently, the obtained web was passed through a pair of upper and lower embossed calender rolls heated to 100 ° C. and thermally bonded. The resulting web is entangled with a needle punch, then immersed in water, lightly squeezed with a mangle, and then subjected to a separation-splitting treatment with a sheet-like material striking-type squeezing machine to give an ultrafine fiber nonwoven fabric with a basis weight of 210 g / m ² Got. Next, this nonwoven fabric was contracted in warm water at 70 ° C. to obtain an area of 60% of the area before contraction.
The obtained fiber aggregate had a basis weight of 350 g / m ² , a thickness of 1.0 mm, and a fineness of 0.15 dtex.

<Creation of fibrous base material (composite structure)>
After impregnating the above fiber assembly with a 10% by weight polyurethane (Dainippon Ink and Chemicals Co., Ltd .; Crisbon TF50P) -dimethylformamide (hereinafter referred to as DMF) solution, excess fiber assembly surface And then dipping it in water containing 5% DMF for 20 minutes to solidify the polyurethane, thoroughly washing and removing the DMF with water, and then drying at 120 ° C. for 4 minutes to form a fibrous base material (composite structure )
The surface of the obtained fibrous base material (composite structure) was a mixture of fibers and polyurethane, having a basis weight of 455 g / m ² and a thickness of 1.0 mm.

<Creation of a fibrous base material having a polymer porous layer on its surface>
20 parts by weight of polyurethane (manufactured by Dainippon Ink & Chemicals, Inc .; Crisbon TF50P) -DMF solution (100 parts of Toray Dow Corning SH28PA as an additive on the surface of the fibrous base material comprising the above polyurethane and fibers Coating with a weight per unit area of 800 g / m ² , and then immersed in water containing 5% DMF for 20 minutes to coagulate the polyurethane and thoroughly wash away the DMF with water. The fiber base material which has a polymer porous layer in which the polyurethane porous layer (wet porous layer) with a density of 0.39 was formed by drying at 5 degreeC for 5 minutes was obtained. The peel strength of the obtained base material was 31.2 N / cm, and it was strong enough to withstand use in various uses of artificial leather including sports shoes.

<Creation of leather-like sheet (sheet-like material) -1>
Using UV curable pigment type ink (cyan, magenta, yellow, light cyan, light magenta, and black) with an inkjet printer (RP-720UVZ, Raster Printer) on the surface of the polyurethane porous layer of the above fibrous base material After printing a landscape image with a resolution of 720 DPI (dots / inch), a thickener was mixed with 100 parts of a 33% aqueous dispersion of polyurethane resin on this surface and stirred to adjust the viscosity to 8000 CPS. The prepared solution was coated at a basis weight of 90 g / m ² and dried at a temperature of 70 ° C. for 2 minutes and at 110 ° C. for 2 minutes to obtain a leather-like sheet (sheet-like material, artificial leather) -1. On the surface of the obtained leather-like sheet-like material-1, a fine and clear image was printed. In addition, when light fastness was measured, there was no change and it was favorable by the 5th grade determination. Moreover, there was no color transfer resistance and it was judged as grade 5 and was good. The peel strength was 24.6 N / cm, and the peeled portion was the interface of the ink jet printing pattern. The abrasion resistance was 1150 times, and the flex resistance was 9000 times. Table 1 shows the physical properties.

[Example 2]
<Creation of Leather-like Sheet (Sheet) -2>
On a release paper (R53 manufactured by Lintec Corporation), a thickening agent was mixed with 100 parts of a 33% aqueous dispersion of polyurethane resin, and the mixture prepared by stirring and adjusting the viscosity to 8000 CPS was coated at a weight of 90 g / m ² . The polymer elastic body film was formed by drying at a temperature of 70 ° C. for 2 minutes and at 110 ° C. for 2 minutes. Furthermore, the surface was coated with a preparation solution prepared by mixing a thickener with 100 parts of a water-dispersed polyurethane adhesive and adjusting the viscosity to 5000 CPS at a weight of 80 g / m ² . Next, after drying at 90 ° C. for 2 minutes, the release paper-like polymer elastic body and the leather-like sheet material obtained in Example 1 were superposed on the surface of the heating cylinder at 110 ° C. to reach 0.00. It was passed through a 6 mm gap roll and pressed. Then, after leaving for 2 days in an atmosphere at a temperature of 60 ° C., the release paper was peeled off to obtain a leather-like sheet (sheet, artificial leather) -2. The obtained leather-like sheet-like material-2 was measured by measuring light fastness. Moreover, there was no color transfer resistance and it was judged as grade 5 and was good. The peel strength was 26.2 N / cm, and the peel location was the interface of the inkjet printing pattern. Further, the wear resistance was as good as 1280 times, and the flex resistance was 11000 times. Table 1 also shows the physical properties.

[Example 3]
On a release paper (R53 manufactured by Lintec Corporation), a thickening agent was mixed with 100 parts of a 33% aqueous dispersion of polyurethane resin, and stirred to adjust the viscosity to 8000 CPS, and coated with a weight of 90 g / m ² . The film was dried at a temperature of 70 ° C. for 2 minutes and at 110 ° C. for 2 minutes to form a polymer elastic layer film. 720 DPI (dots) using UV curable pigment type ink (cyan, magenta, yellow, light cyan, light magenta, and black) with an inkjet printer (RP-720 UVZ Raster Printer) on the surface of this polymer elastic layer. / Inch) landscape pictures were printed. Next, on the surface of this printing surface, a blended liquid prepared by mixing a thickener with 100 parts of a water-dispersed polyurethane adhesive and adjusting the viscosity to 5000 CPS was coated at a weight of 80 g / m ² and heated at 90 ° C. for 2 minutes. After drying, the fibrous base material (composite structure) obtained in Example 1 was then superposed and passed through a roll with a gap of 0.6 mm on the surface of a heated cylinder having a temperature of 110 ° C. and pressure bonded. Then, after leaving for 2 days in an atmosphere at a temperature of 60 ° C., the release paper was peeled off to obtain a leather-like sheet (sheet, artificial leather) -3. The obtained leather-like sheet-like product-3 was measured by measuring light fastness. Moreover, there was no color transfer resistance and it was judged as grade 5 and was good. The peel strength was 28.5 N / cm, and the peel site was the interface of the inkjet printing pattern. The abrasion resistance was as good as 1150 times, and the flex resistance was 10500 times. Table 1 also shows the physical properties.

[Comparative Example 1]
Instead of using UV curable pigment type ink on the surface of the fibrous base material having the polymeric porous layer obtained in Example 1, an organic solvent-based pigment ink is used with an inkjet printer (Roland SJ-545EX). (ECO-SOLMAX) was used to print a landscape image with a resolution of 720 DPI (dots / inch) and then heat treated at 120 ° C. for 1 minute to carry out the same operation as in Example 1 to form a leather-like sheet. -4 was obtained. On the surface of the obtained leather-like sheet-like material-4, a fine and clear image was printed. In addition, when light fastness was measured, there was no change and it was favorable by the 5th grade determination. Moreover, there was no color transfer resistance and it was judged as grade 5 and was good. However, the peel strength was as low as 5.2 N / cm, and the peeled portion was a pigment layer for inkjet printing, and it was not a material that could withstand the use of each application as a leather-like sheet. The abrasion resistance was 10 times, which was caused by peeling of the pigment layer. Further, the bending resistance was 1700 times, which was caused by the peeling of the pigment layer. Table 1 also shows the physical properties.

[Comparative Example 2]
Instead of using a UV curable pigment type ink on the surface of the fibrous base material having the polymeric porous layer obtained in Example 1, dye inks (IC5CL06 and IC1BK05) using an ink jet printer (EPSON PM3700C) ) Was used to print a landscape image with a resolution of 720 DPI (dots / inch) and then heat-treated at 120 ° C. for 1 minute to obtain a leather-like sheet-like material-5. It was. The surface of the obtained leather-like sheet-like material-5 was printed with a fine and clear image. However, when the light fastness was measured, the color faded partially and was far from the original color. There was a second grade judgment. Further, the color transfer resistance was also judged as a third grade, and the color was transferred to the surface of the other white artificial leather. The peel strength was 17.8 N / cm, which was lower than before printing with an ink jet printer. The peeled portion is partially due to the ink-jet printing layer, which is thought to cause a reduction in peel strength. Further, the wear resistance was 460 times, which was caused by peeling of the printed layer. Moreover, the bending resistance was 10100 times. Table 1 also shows the physical properties.

[Comparative Example 3]
After printing a landscape image with a resolution of 720 DPI (dots / inch) using a UV curable pigment type ink on the surface of the fibrous base material having the polymer porous layer obtained in Example 1 on the surface, Instead of an aqueous dispersion of polyurethane, a solution prepared by mixing 100 parts of Resamine LU-2109HV (25% polyurethane concentration manufactured by Dainichi Seika Co., Ltd.), 15 parts of DMF, and 15 parts of isopropyl alcohol was applied to the surface at a weight of 120 g / m ² . A leather-like sheet-6 was obtained in the same manner as in Example 1 except that coating was performed and drying was performed at a temperature of 70 ° C. for 2 minutes and at 110 ° C. for 2 minutes. The surface of the obtained leather-like sheet-6 had no problem with light fastness and color transfer resistance, but there was no problem, but the dye swelled with an organic solvent and oozed out to each other, and the image was distorted. There was no clearness. The peel strength was 10.5 N / cm, which was lower than that of a fibrous base material having a polymer porous layer on the surface before printing with an ink jet printer. The peeled portion is partially due to the ink-jet printing layer, which is thought to cause a reduction in peel strength. Further, the wear resistance was 460 times, which was caused by peeling of the printed layer. Moreover, the bending resistance was 220 times, which was not usable for various purposes. Table 1 also shows the physical properties.

[Comparative Example 4]
Instead of using UV curable pigment type ink on the surface of the fibrous base material having the polymer porous layer obtained in Example 1 on the surface, using an ink jet printer (SJ-545EX, manufactured by Roland), an organic solvent 720 DPI (dots / inch) using a pigment ink (ECO-SOLMAX, Cyan ESL3-CY, Magenta ESL3-MG, Yellow ESL3-YE, Light Cyan ESL3-LC, Light Magenta ESL3-LM, Black ESL3-BK) After printing a landscape image with a resolution, heat treatment was performed at 120 ° C. for 1 minute. On this printed surface, a solution prepared by mixing 100 parts of Rezamin LU-2109HV (Polyurethane concentration 25% manufactured by Dainichi Seika Co., Ltd.), 15 parts of DMF, and 15 parts of isopropyl alcohol was coated at a weight of 120 g / m ² at a temperature of 70 ° C. A protective layer (polymer elastic body layer) was prepared by drying at 110 ° C. for 2 minutes for 2 minutes to obtain a leather-like sheet-7. The surface of the obtained leather-like sheet-like material-7 had a light fastness and a color transfer resistance of grade 5, and there was no problem, but the image was slightly disturbed because the dye was slightly swollen with an organic solvent. . Further, the peel strength is as low as 8.2 N / cm, and the peeled portion is an ink-jet printing layer, and the pigment layer is considered to be a cause of a drop in peel strength. Further, the wear resistance was 420 times, which was caused by peeling of the printed layer. In addition, the flex resistance was 350 times, which was not usable for various purposes. Table 1 also shows the physical properties.

Claims (9)

  A method for producing a sheet-like product, comprising forming an image made of a UV curable pigment on a polymer elastic body layer, and applying a water-based polymer elastic body after UV curing.   2. The method for producing a sheet-like material according to claim 1, wherein a method for forming an image is an ink jet method.   The sheet-like manufacturing method according to claim 1 or 2, wherein the resolution of the image is 5 dots / mm or more.   The method for producing a sheet-like material according to any one of claims 1 to 3, wherein the polymer elastic body is polyurethane.   The method for producing a sheet-like material according to claim 4, wherein the polymer elastic body layer is a wet polyurethane porous layer.   The method for producing a sheet-like material according to any one of claims 1 to 5, wherein the polymer elastic body layer is present on the fibrous base material, and the water-based polymer elastic body is a surface layer.   The polymer elastic layer is present on the release paper, the polymer elastic layer on the release paper and the fibrous base material are bonded together with a water-based polymer elastic body, and then the release paper is peeled and removed. The manufacturing method of the sheet-like material of any one of -5.   The method for producing a sheet-like product according to any one of claims 1 to 6, wherein the fibrous base material has ultrafine fibers.   The leather-like sheet-like material by the manufacturing method of any one of Claims 1-8.