JPH0544174A - Enamel-toned synthetic leather with printed pattern - Google Patents

Abstract

PURPOSE:To obtain the title synthetic leather excellent in smoothness and mechanical strength, with profound color tone by providing a fibrous base material with a layer of printed pattern and by laminating said layer with transparent, soft two surface layers of enamel-toned gloss. CONSTITUTION:For example, a release paper is provided with an intermediate layer of thermoplastic polyurethane resin; the wet fine porous layer on a fibrous base material is then laminated with said intermediate layer, and this polyurethane resin layer is then imparted with gravure printed pattern. An enamel-toned release paper is provided with two surface layers of polyurethane resin 110kg/cm<2> and 30kg/cm<2> in 100% modulus and 500% and 550% in elongation, respectively, and thereon, an adhesive layer of e.g. a two-component type polyurethane resin is formed; through this adhesive layer, said gravure printed pattern layer is laminated to unification, thus obtaining the objective synthetic leather of profound, clear color tone with high enamel-toned gloss.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an enamel-like synthetic leather having a print pattern used for shoes, bags and the like.

[0002]

2. Description of the Related Art Enamel-like synthetic leather with a conventional printed pattern is first coated with a polyurethane resin for the surface layer on a glossy enamel release paper and dried, and then with a polyurethane resin for intermediate adhesion. After the fibrous substrate is laminated on the polyurethane resin for intermediate adhesion and dried to release the release paper, a synthetic leather having the glossy surface of the enamel release paper transferred to the surface thereof is obtained, and then the surface layer having the above glossiness is obtained. A print pattern was formed on the polyurethane resin for use by gravure or printing, and was formed to have a print pattern and an enamel-like gloss.

[0003]

However, in the case of the above-mentioned conventional enamel-like synthetic leather, the enamel-like luster is lost because the print is applied from the skin layer forming the glossy surface. Only an enamel tone with low gloss can be obtained, and since the print pattern is provided on the surface, there is a problem that the depth and vividness of the color cannot be obtained. In addition, when a skin layer is adhered to a substrate, a two-component curing type urethane adhesive is generally used, and when the obtained synthetic leather is subjected to high frequency processing and post-processing, the surface layer resin and the urethane adhesive are used. There is a problem that a part of the curing agent of the agent reacts and the resin of the surface layer is cross-linked to deteriorate the high frequency processing property. The present invention has been made to solve the above-mentioned drawbacks of the prior art, and is excellent in enamel appearance and color and depth of a printed pattern, and even when a two-component curing type urethane adhesive is used, It is an object of the present invention to provide an enamel-like synthetic leather having a print layer excellent in physical properties such as good high-frequency processing characteristics.

[0004]

The enamel-like synthetic leather having a print pattern according to the present invention comprises at least a fibrous substrate, a print layer comprising the print pattern for imparting a design property, and a print layer on the print layer. A synthetic leather provided with a skin layer having an enamel luster, wherein the skin layer is formed by laminating two or more transparent and flexible resin layers. Further, in the enamel-like synthetic leather having the above-mentioned printed pattern, it is preferable that the outermost surface layer of the skin layer is made of a high-frequency processable resin, and the two-component curable adhesive is arranged under the skin layer.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. The drawings show one embodiment of the present invention, and FIG. 1 shows one example of enamel-like synthetic leather (hereinafter abbreviated as enamel-like synthetic leather) having the print pattern of the present invention. As shown in FIG. 1, the enamel-like synthetic leather 1 of the present invention is provided with a print layer 3 having a print pattern for imparting a design property on a fibrous substrate 2, and the enamel-like print layer 3 is provided on the print layer 3. A glossy skin layer 4 is provided, and the skin layer 4 is formed by laminating two transparent and flexible resin layers of a first skin layer 41 and a second skin layer 42. There is something.

The enamel-like synthetic leather 1 of the present invention may have at least the above constitution, but as shown in the drawing, a fibrous base material is formed on the base material 21 and the surface of the base material 21 as required. It may also be composed of the wet porous layer 22. Further, the intermediate adhesive layer 7 may be provided between the skin layer 4 and the printed layer 3, and the intermediate layer 8 may be provided between the printed layer 3 and the fibrous substrate 2 (wet microporous layer 22). ..

The present invention is characterized in that the skin layer 4 is formed of two or more transparent and flexible resin layers. Epidermal layer 4
Is 2 if at least two resin layers are laminated.
It may be formed from any number of layers including layers. In particular, when the skin layer 4 composed of a large number of coating layers is formed by repeating a large number of resin coatings, compared with the case where a skin layer composed of a resin layer having the same thickness is formed by one coating, a pinhole is formed. The defects of the coating film, such as the occurrence of the occurrence of bubbles and foaming due to the volatilization of the solvent, are reduced, and a smoother and uniform coating film layer can be formed. The resin forming the skin layer 4 has such transparency that the design of the print layer 3 provided inside the synthetic leather 1 can be seen (semi-transparent,
Colored transparent, colored translucent, etc.), as long as it has flexibility not impairing the texture of the synthetic leather, is not particularly limited,
The resin generally used for the surface layer of synthetic leather can be used. Specific properties of the resin having the flexibility, elongation of 100% or more, 100% modulus 20~300kg / cm ^2, breaking strength 200 kg / cm ²
The above are preferable, and examples of the resin having such physical properties include a polyurethane resin, a polyvinyl chloride resin, an acrylic resin, and the like. Particularly, a copolymer of a vinyl resin and a polyurethane resin has a high frequency. It is preferable in terms of good processing characteristics.

The skin layer 4 includes a first skin layer 41 and a second skin layer.
The same resin or different resins may be used for the resin used for the skin layer 42. In the enamel-like synthetic leather of the present invention, the outermost surface layer (for example, in the example of FIG.
Different types of resin can be used for the skin layer 41) and the skin layer underneath (the second skin layer 42 in the example of FIG. 1 as well). Spread, for example, the outermost surface layer is formed of a resin that has good characteristics for high frequency processing, and by using a resin that has good flexibility and strength as the lower layer, it has excellent high frequency processing characteristics and flexibility and strength. A skin layer is obtained. In this way, the skin layer in which various different characteristics are combined can be easily formed.

As the thickness of the skin layer 4 increases, the appearance of the enamel tone improves, the surface strength increases and various physical properties improve, but if it is too thick, the texture of the synthetic leather is impaired, so Total layer thickness 10-100μ
It is preferable to determine the thickness of each layer so that it is about m. To form the skin layer 4 in an enamel tone, an enamel release sheet is used, a resin layer is applied on the surface of the sheet to form a film, and the glossy surface of the release paper sheet is imprinted on the resin layer surface. A method of giving smoothness and gloss by coating multiple times. And so on.

As the base material 21 used for the fibrous base material 2,
A fibrous base material generally used as a base material of synthetic leather, for example, knitted fabric such as tricot and knit,
Woven fabric made of synthetic fiber or spandex (elastic fiber), non-woven fabric made by spunbond method and the like can be used. Examples of the fiber material constituting these include natural fibers such as cotton, hemp, wool and silk, rayon, acetate, There are chemical fibers such as nylon, acrylic, polyester, polyvinyl alcohol, polypropylene, polyurethane, polyvinyl chloride, polyvinylidene chloride and polyethylene, and mixed yarns thereof.

The wet microporous layer 22 is formed by applying a polyurethane resin dissolved in a water-miscible organic solvent (such as DMF) on the surface of the base material 21 and then immersing it in water to remove the solvent, thereby removing the polyurethane resin. By solidifying, it can be formed as a porous layer having a large number of pores due to desolvation. As described above, the wet microporous layer 22 is formed on the substrate 21.
By providing, it is possible to obtain synthetic leather having a texture closer to that of natural leather.

The print layer 3 is for imparting a design to the synthetic leather, and is a print pattern having a design such as a picture, a line, an abstract pattern, a cloud pattern, etc., and can be selected according to the intended use of the enamel-like synthetic leather. It is possible to appropriately select a print pattern and form it by means such as gravure printing or screen printing using a printing ink.

The intermediate adhesive layer 7 is used for firmly adhering the skin layer 4 to the fibrous substrate 2, and may be any one capable of adhering the skin layer 4 (second skin layer 42). In particular, a two-component curing type urethane adhesive is preferably used because it has a good adhesive force and the like. In this case, when the skin layer is only one layer, the property is lost even if the skin layer is crosslinked and the skin layer resin can be subjected to high-frequency processing. This has the advantage that various disadvantages are eliminated. In addition to the above, the adhesive is acrylic, vinyl acetate, PVA, SBR, NBR, CR,
It is also possible to use various synthetic resin type such as NR, synthetic rubber type solvent type, emulsion type adhesive and the like. The thickness (amount used) of the intermediate adhesive layer 7 is preferably in a range that does not harden the texture of the synthetic leather and obtains a sufficient adhesive force. Specifically, the solid content of the adhesive is 10 to 80 g / A range of m ² is preferable.

The intermediate layer 8 is a layer provided so that the print layer 3 can be formed more easily. As a material for forming the intermediate layer 8, a base material 21 or a wet microporous layer 2 as an underlying layer is used.
The surface of 2 is made smooth, and the print layer 3 can be clearly formed on it by printing or the like, and a resin having physical properties that does not impair the texture of synthetic leather is used, and such a resin has, for example, 100% modulus. Is 30 kg / cm ² , elongation 60
A thermoplastic polyurethane resin of about 0% may be used, and the thickness is preferably 5 to 50 μm. By providing the intermediate layer 8, the fibrous substrate 2 (wet porous layer 2
When the surface of 2) becomes smooth and the print layer 3 is directly printed on the surface of the substrate 2, blurring does not occur in the printed pattern, and clearer printing can be performed.

Although not particularly shown, the synthetic leather of the present invention may be embossed to give an embossed pattern. The embossed pattern is preferably provided on the intermediate layer 8. When the embossed roll having a high gloss is used, the gloss of the enamel-like synthetic leather 1 can be further improved and the shadow of the embossed pattern can be imparted. Note that this embossing is performed after the print layer 3 is formed when gloss is imparted only to the surface of the print layer. If embossing is performed before forming the print layer 3 on the intermediate layer 8, both the intermediate layer 8 and the print layer 3 can be embossed. Specifically, this embossed pattern can form various patterns depending on the change in gloss (gloss, semi-gloss, matte, etc.) and the type of grain.

The enamel-like synthetic leather 1 of the present invention can be produced, for example, by the following method. A solution of a resin for forming the intermediate layer 8 is applied onto the release paper and dried to form the intermediate layer 8 (a). Next, the intermediate layer of (a) is laminated so as to be in contact with the fibrous substrate 2 having the wet microporous layer 22 formed on the base material 21 if necessary, and the release paper is peeled off to form the intermediate layer 8 Only is transferred to the surface of the fibrous substrate 2. Further, a print pattern is printed on the intermediate layer 8 to form the print layer 3 (b). On the other hand, a resin solution for forming a skin layer is applied onto the enamel release paper and dried, and this coating and drying are repeated a desired number of times to form a multi-layered skin layer 4. The skin layer 4
The intermediate adhesive layer 7 is laminated on (c). The printed layer 3 of (b) and the intermediate adhesive layer 7 of (c) are laminated so as to be in contact with each other and integrated, and then the enamel release paper is peeled off to obtain an enamel-like synthetic leather.

Hereinafter, the present invention will be described in more detail with reference to specific examples of the present invention. Example 1 100% modulus 110 kg / cm ² , elongation 500 on enamel release paper (cpu G: LINTEC CORPORATION).
%, A solution of a polyurethane resin (Hirac H7110A: manufactured by Toyo Polymer Co., Ltd.) having a breaking strength of 400 kg / cm ² was knife-coated to a dry thickness of 8 μm and dried, and further 100% modulus 30 kg / c
Polyurethane resin with m ² , elongation of 550%, breaking strength of 400 kg / cm ² (Hirac 4030: Toyo Polymer Co., Ltd.)
Is applied to form a skin layer having a total dry thickness of 22 μm, and a two-component polyurethane resin adhesive (Crisbon 4010: manufactured by Dainippon Ink and Chemicals, Inc.) is applied on the skin layer to form an intermediate adhesive. Layers were formed. On the other hand, a thermoplastic polyurethane resin (Krisbon 5516: Dainippon Ink and Chemicals, Inc.) solution is coated on a release paper and dried to form an intermediate layer, and a base material made of Tetron / rayon (T / R7050 raised cloth) On the wet microporous layer of the fibrous substrate on which the wet microporous layer was formed, the thermoplastic polyurethane resin was laminated so as to be in contact, and the release paper was peeled off and transferred. Further, gravure printing was performed on the thermoplastic polyurethane resin to give a print pattern. The enamel-like synthetic leather having a print pattern was obtained by laminating and integrating the adhesive of the skin layer having the adhesive layer on the gravure pattern so that the release paper and the release paper were peeled off. The obtained synthetic leather has a surface gloss of 99% or more (GROSSMET
ER method), high enamel glossiness, clear print pattern and deep color tone, and excellent designability. It was also excellent in high frequency processing characteristics.

[0018]

As described above, in the enamel-like synthetic leather having the print pattern of the present invention, the print layer is located under the skin layer, and the skin layer is formed of two or more transparent and flexible resin layers. By adopting the above, compared to the conventional synthetic leather in which the printed pattern is provided on the skin layer, the skin layer is composed of two or more layers, so that the smoothness and strength are excellent. Since the internal skin layer has a multi-layer structure, the refractive index changes at the boundary of the skin layer, so that the print pattern of the print layer has a three-dimensional appearance and expresses a design with a clear and deep color tone. be able to.
Further, since the skin layer has a multi-layer structure, for example, even when a resin that easily affects the skin layer is used for the lower adhesive layer or the like, only the lowermost layer of the skin layer is affected and the stop skin layer is affected. The resin layer on the front side is not affected. As described above, it has an effect that various different physical properties can be easily imparted to the skin layer.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a longitudinal cross section of a main part of an example of an enamel-like synthetic leather having a print pattern of the present invention.

[Explanation of symbols]

 1 Enamel Synthetic Leather Having Printed Pattern 2 Fibrous Substrate 3 Printed Layer 4 Skin Layer 41 First Skin Layer 42 Second Skin Layer

Claims (2)

[Claims] 1. A synthetic leather in which at least a print layer having a print pattern for imparting a design property is provided on a fibrous substrate, and a skin layer having an enamel luster is provided on the print layer. An enamel-like synthetic leather having a printed pattern, wherein the skin layer is formed by laminating two or more transparent and flexible resin layers. 2. The enamel-like synthetic leather having a print pattern according to claim 1, wherein the outermost surface layer of the skin layer is made of a resin that can be processed by high frequency, and a two-component curable adhesive is arranged under the skin layer. ..