JPH01216828A - Laminated sheet showing cloth pattern - Google Patents

Abstract

PURPOSE:To produce an artificial leather in which the texture of a fundamental cloth is appeared as the difference of shade with superficial color by a process wherein a heat deformable polyurethane resin porous layer is formed on the fundamental cloth and a transparent or semi-transparent colored synthetic resin is laminated on the porous layer, after that an embossing finish is given thereon. CONSTITUTION:The heat defromable polyurethane resin porous layer with the width of 50-700mum comprising a colored polyurethane resin with the heat softening temperature of 120-1180 deg.C is formed through a wet method on the fundamental cloth consisting of a knitting or weaving cloth without rising. The transparent or opaque colored synthetic resin is laminated on the porous layer and an embossing finish is performed by the use of a heat embossing roll. The part corresponding to the protrusive part of the fundamental cloth appears to be deep color in its superficial color because the pigment density becomes large. In the case of employing an embossing roll with large recessions and protrusions, the pattern corresponding to the texture pattern appears on the part corresponding to the protrusion of the embossing roll, and in the case of employing an embossing roll with small recessions and protrusions, the pattern corresponding to the texture pattern appears on the almost part of all of the sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a laminated sheet used for shoes, bags, clothing, etc., which has a pattern of a base fabric expressed on its surface.

(Conventional technology) Synthetic leather is lower in cost than natural leather, and is superior in terms of waterproofness, uniformity, and ease of sewing.
Traditionally, it has been used as a substitute for natural leather. Therefore, the appearance and texture are even slightly closer to natural leather than before.
It has been developed with the aim of obtaining physical properties. Wet-processed synthetic leather developed for this purpose is made by applying porous polyurethane resin to a base fabric made of materials such as nonwoven fabric and raised fabric.
There is one in which a porous polyurethane resin layer is formed by wet coagulation using a conventional method, a synthetic resin coating is further provided on the core layer, and this is embossed.

(Problems to be Solved by the Invention) However, the design expected of materials for shoes, clothing, etc. is increasing year by year, and materials with new sensations are always being sought. Therefore, there is a need to develop synthetic leather not only as a substitute for natural leather, but also as a material completely different from conventional materials such as natural leather, conventional synthetic leather, and textiles.

As a result of extensive research into the production of new materials, the inventor of the present invention discovered that in the conventional wet synthetic leather manufacturing method, woven fabric is used as the base fabric, and the type of porous polyurethane resin and the thickness of the coating film are changed. It has been found that by appropriately determining the texture of the base fabric, it is possible to produce synthetic leather in which the texture of the base fabric appears as a difference in the shade of the surface color. The synthetic leather produced by this method exhibits a completely new appearance that is different from natural leather, conventional synthetic leather, and textiles.

(Means for Solving the Problems) Therefore, the present invention provides a polyurethane resin with a thickness of 50 to 70°C, which is made of a colored polyurethane resin with a heat softening temperature of 120 to 180°C.
A 0 μm thermally deformable polyurethane resin porous layer is formed by a wet method on a base fabric made of non-raised knitted or woven fabric, a transparent or translucent colored synthetic resin is laminated on top of the porous layer, and , relates to a laminated sheet that is embossed with a heated embossing roll to reveal a fabric pattern.

The thickness of the porous layer varies depending on the pattern to be formed as shading on the surface, the type of polyurethane resin used, the type of base fabric, the size of the unevenness of the embossing roll, etc., but is between 50 and 70 mm.
It is selected within the range of 0 μm. This is because if the thickness is less than 50 μm, the porous layer is too thin to create unevenness due to the embossing roll and weave, and if it exceeds 700 μm, the porous layer is too thick for the unevenness formed by the weave, resulting in a difference in pigment density. This is because the surface color is not reflected sufficiently, making it difficult to clearly recognize the shading of the surface color. The porous layer is formed by dissolving a polyurethane resin, if desired, in an organic solvent such as dimethylformamide to obtain a resin liquid, coating this on a base fabric by a conventional method, and wet-coagulating the resin liquid.

As the polyurethane resin forming the porous layer, one is selected that has good coagulation film forming properties by a wet method and also has mixed heat deformability. Further, the polyurethane resin has a heat softening temperature of 120 to 180°C, preferably 140 to 1
Use one that has a temperature of 50°C. This has a heat softening temperature of 1
If it is not grooved at 20℃, stable variable color processing is difficult, and the porous layer that is formed tends to become brittle, which may cause practical problems. This is because there is a risk that the discoloration will not be sufficient.

The 100% modulus as a physical property of this polyurethane resin is preferably 10 to 90 kg/c+M.

Those with a 100% modulus of 90 kg/ca1 or more are
The texture tends to become hard, and if the weight is less than 10 kg/cJ, problems arise in terms of film formability during wet coagulation during production.

As such a polyurethane resin, one obtained by reacting a polyol with a diisocyanate and a polyfunctional chain extender is used. As the polyol, polyester polyol, polyether polyol, polyether polyester polyol, etc. having hydroxyl groups at both ends can be used. As the polyester polyol, for example, aliphatic dicarboxylic acids such as adipic acid and sebacic acid, ethylene glycol, Examples include polyester polyols obtained by polycondensation from aliphatic glycols such as butylene glycol and hexamethylene glycol. Examples of polyether polyols include polypropylene glycol obtained by polymerizing propylene oxide, polytetramethylene glycol obtained by ring-opening polymerization of tetrahydrofuran, and the like.

Next, as the diisocyanate, naphthylene, diisocyanate, p, p''-diphenylmethane diisocyanate, phenylene diisocyanate, 2.4 (or 2
．． 6) Aromatic isocyanates such as -tolylene diisocyanate and aliphatic isocyanates such as hexamethylene diisocyanate can be used, and as the polyfunctional chain extender, compounds having at least two active hydrogen groups in the molecule, e.g. Fat group diamines such as hydrazine, ethylene diamine and propylene diamine, aliphatic glycols such as butylene glycol and ethylene glycol, etc. can be used.

By the way, in the present invention, the porous layer is compressed at different degrees of compression due to the irregularities of the texture of the base fabric, and this creates a difference in the pigment density in the porous layer, so that the shading of the surface color appears. Although it is essential that the porous layer is colored, coloring can be carried out by a method known in the art, such as a method of adding a coloring agent such as a pigment or dye to a polyurethane resin solution.

As pigments that are colorants, inorganic pigments such as carbon black and titane oxide, and existing pigments such as phthalocyanine, anthraquinone, and azo pigments can be used.As dyes, metal-containing hydrochloric acid chains with good solubility in solvents can be used. Dyes and the like can be used alone or in combination. If a sufficient variable color effect is expected, the amount of these colorants used should be small (at least 1 part by weight per 100 parts by weight of the polyurethane resin). It is even more important to add an activator or the like to the polyurethane resin liquid.

In the present invention, the thickness of the transparent or translucent colored synthetic resin layer formed on the porous layer is preferably 1 μm to 50 μm. As the polyurethane resin that can be used to form the colored synthetic resin layer, the polyurethane resins listed above in the explanation of the polyurethane resin forming the porous layer can be used, and the physical properties are 10.
Those with a 0% modulus of 10 to 80 kg/csfiO are preferable, and those with a 100% modulus of more than 80 kg/c+a have a hard texture and 10 kg/c
If it is less than ++T, the coating will be soft but the strength of the coating will be weak.
Moreover, it is not preferable because it has poor light resistance. The heat softening temperature is preferably between 120°C and 200'C. If the heat softening temperature is higher than 200°C, it will be difficult to thermally deform the porous layer located below, and therefore the effect of variable color processing will be reduced. 120℃ is not preferable because it is not sufficiently stirred.
If it is less than that, the surface becomes extremely sticky and problems such as adhesion of dust occur in practical use, so this is not preferable.

For example, the colored synthetic resin layer is prepared by first applying a gravure coloring compound consisting of a polyurethane resin and a pigment onto the porous layer,
Thereafter, a clear treatment agent made of a urethane resin with excellent heat resistance is applied and dried to form a two-layer structure in which a clear coating film is formed on the colored resin layer. In addition, a colored resin layer is formed on the clear coating film by first applying the above-mentioned clear treatment agent and then coating the above-mentioned resin and coloring compound.
It can also be formed as a structure. Furthermore, a colored resin layer having a single layer structure made of the resin and paint may be formed without using a clear treatment agent. Furthermore, by applying a polyurethane resin compounding agent, the coloring ratio of pigments dispersed in urethane resin with excellent heat resistance is -
In step i, it is also possible to form a coating film having the functions of both the clear coating film and the colored resin layer.

In the present invention, the base fabric is made of natural fibers such as cotton, hemp, and wool, chemical fibers such as rayon and polynosic fibers, synthetic fibers such as polyester, nylon, and polyacrylonitrile, etc. alone, or a woven fabric made of a mixture thereof. It's cloth.

Among these, those that are raised are not preferred because it is difficult to make the texture of the woven fabric appear.

Therefore, in the present invention, the above-mentioned textile fabric that is not raised is used as the base fabric. So-called wet-impregnated fabrics obtained by impregnating or coating these base fabrics with a polyurethane resin and then wet-coagulating them can also be used as the fibrous base material of the present invention.

As the embossing roll, both those with large and small irregularities (flat rolls) can be used.

If a material with large irregularities is used, both the irregularities of the embossing roll and the irregularities of the texture of the base fabric will appear as a pattern.

(Function) In the present invention, a porous polyurethane resin layer and a colored synthetic resin layer are formed on a base fabric made of knitted or woven fabric, and the embossing process is performed on the layers. The resin porous layer is compressed non-uniformly. The portions of the base fabric corresponding to the convex portions have a high pigment density, so the surface color appears dark. Note that when an embossing roll with large irregularities is used, a pattern corresponding to the weave pattern appears on the part corresponding to the convex part of the embossing roll, and when an embossing roll with small irregularities is used, it appears on almost the entire sheet. A pattern corresponding to the texture pattern appears.

(Examples) Examples of the present invention will be described below, but the present invention is not limited to these Examples.

Example 1 As the base fabric 2, a No. 8 canvas having the weave shown in FIG. A wet application paste consisting of 130 parts by weight of a resin (Lethermin Cu530), 10 parts by weight of a pigment (Guilakshi Color), and 18 parts by weight of KC flock was applied and dried to form polyurethane resin porous WJ3.

Polyurethane resin porous r! formed in this way! On top of J3, non-porous polyurethane resin (Haulak 1529)
After applying a gravure coloring compound consisting of 100 parts by weight and 10 parts by weight of a pigment (Guilac TV Color), 10 parts by weight of a heat-resistant urethane resin (Glossilac LD 0290)
0 parts by weight and urethane resin (Glossilac L 0078
1) Colored synthetic resin 1!14 is formed by applying a clear treatment agent of 10 parts by weight and drying.

The color changeable synthetic leather thus produced was embossed using an embossing roll with large irregularities on the processed surface.

As shown in the cross-sectional view of FIG. 1, the resulting laminated sheet 1 has a polyurethane resin porous layer 3 and a polyurethane resin reinforcing layer 4 formed on the base fabric 2, and the polyurethane resin porous layer 3 is formed on the embossing roll surface. It is partially compressed due to the unevenness and the unevenness of the texture of the base fabric. In the concave portion 5 of the laminated sheet 1 compressed by the convex portion of the embossing roll,
As shown in the plan view of FIG. 2, a pattern of light and shade formed by the texture of the base fabric appeared.

Example 2 Example 1 except that a rayon fabric #3323 having a weave as shown in FIG. 6 was used as the base fabric 21, and an embossing roll with small irregularities on the processed surface was used. By a method similar to that of ! A shoe body I° was manufactured.・1 degree of the laminated sheet obtained by this is the fourth
As shown in the cross-sectional view of the figure, a polyurethane resin porous layer 3'' and a colored synthetic resin layer 4' are formed on a base fabric 2'', and the polyurethane resin porous layer 3g is compressed by the irregularities of the texture of the base fabric. . Since the portion compressed by the convex portion of the base fabric 2° exhibits a dark color, the surface of the laminated sheet 19, that is, the colored synthetic resin F! As shown in the surface view of FIG. 5, a pattern of shading corresponding to the texture of the base fabric is formed on the J4° side surface.

(Effects of the Invention) In the present invention, a polyurethane resin porous layer and a colored synthetic resin layer are formed on a base fabric made of woven fabric, and embossing is performed on this, so that the texture of the textile material has a surface color. It is possible to obtain synthetic leather that appears as shading. Therefore, the texture of the base fabric and the unevenness formed by the embossing roll,
The subtle contrast of light and shade in the surface color of urethane resin makes it possible to create a new type of material that does not exist with conventional materials. Furthermore, simply by changing the base fabric, the pattern appearing on the surface changes, so various materials can be easily manufactured, and it is suitable for producing a wide variety of products in small quantities.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the synthetic leather of one embodiment of the present invention, Fig. 2 is a front view of the synthetic leather shown in Fig. 1, Fig. 3 is a back view of the synthetic leather shown in Fig. 1, Fig. 4 5 is a cross-sectional view showing a synthetic leather according to another embodiment of the present invention, FIG. 5 is a front view of the synthetic leather shown in FIG. 3, and FIG. 6 is a back view of the synthetic leather shown in FIG. 4. 1...Synthetic leather 2...Base fabric 3...Polyurethane resin porous layer 4...Colored synthetic resin layer

Claims (1)

[Claims] A porous layer of heat-deformable polyurethane resin with a thickness of 50 to 700 μm, made of a colored polyurethane resin with a heat softening temperature of 120 to 180°C, is formed by a wet method on a base fabric made of a non-raised textile fabric. A laminated sheet in which a transparent or translucent colored synthetic resin is laminated on the porous layer, and this is embossed with a heated embossing roll to reveal a cloth pattern.