JPS5865074A - Patterned artificial leather and production thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to highly durable patterned artificial leather and a method for producing the same. More specifically, a highly durable patterned artificial leather that has an embossed pattern by heat embossing, and at the same time has a three-dimensional, high-class appearance with a difference in color between the embossed recesses and other parts, and the manufacture thereof. Regarding the law.

Methods for imparting patterns to artificial leather include the use of a resin film support with a release paper that has an uneven pattern when creating the first surface layer, and the embossing method that has an uneven pattern on the surface after creating a leather-like substrate. Currently, a method of stamping by heating and pressing with a rule or an embossing plate is commonly used. In the former method, the pattern of the support is transferred to the leather surface relatively clearly, but the degree of unevenness is smaller than in the latter method, and the appearance is film-like, resulting in a low-grade appearance. It has disadvantages such as:

In addition, with the former method, although it is possible to provide unevenness, it is impossible to create a color difference between shading and lightness in the uneven parts. In order to improve this drawback, multiple layers of resins with different dyeability are placed on the release paper in advance, and after bonding to the substrate, the noodle shadow paper is removed and dyed to give an uneven pattern, and at the same time, the recesses are removed. A method of imparting a unique color effect using the difference in dyeing of the convex portions has been proposed.

Although this method provides a three-dimensional pattern due to the desired unevenness and a three-dimensional effect due to a unique color effect, improving the sense of luxury, the appearance of a Phil person cannot be avoided.

Dyeing significantly increases processing costs, making it unsuitable for general use.

Furthermore, the latter method is widely adopted for stamping artificial leather, and the unevenness detection and pattern type can be varied in various ways, and the appearance is similar to that of natural leather. It has the disadvantage that it is not possible to create a three-dimensional pattern by giving different shades of color to the area. In order to compensate for this drawback, a coloring agent is applied in advance to the convex g of the embossing roll or embossing plate, and a unique color effect is created by transferring the coloring agent to the part corresponding to the concave part of the leather embossed. A method of providing this is proposed.

Although this method can produce a certain degree of unique color effect, there is a problem with durability in that the coloring agent easily peels off when the leather is processed into shoes, belts, etc. and actually used. In addition, the process is extremely complicated, and it is difficult to uniformly apply a single layer colorant to an embossing roll or embossing plate, so it is hardly ever put into practical use. Eliminate defects and create a three-dimensional effect,
The present invention provides a patterned artificial leather with excellent durability and a method thereof.

That is, the artificial leather of the present invention has at least an i1m-based porous synthetic W-layer skin layer, and the base material and/or the skin layer contains a colored pigment, and the surface of the skin layer has a density. It is a patterned artificial leather with large concave areas.

In addition, the manufacturing method includes heat embossing an artificial leather comprising at least an anchor base material and a porous synthetic resin skin layer, at least one of which contains a pigment, to infuse α03 to αs o I into the skin layer. This invention relates to a method for developing artificial leather characterized by: 1--A method for developing artificial leather characterized by forming concave portions to create a density difference of /al, imparting an uneven pattern, and developing a deep color in the concave portions.

The jiln constituting the anchor base material of the present invention can be a normal weave, such as cotton, linen, rayon, or wool.

Acetate, nylon, polyester, polyacrynitrile, polyolefin, vinylon, etc. are used. These embroideries may be used alone or in combination.

Methods for forming the fibrous anchor base material include woven fabrics, non-woven fabrics, and non-woven fabrics, and any of these can be used, but non-woven fabrics are most desirable from the viewpoint of elongation and strength, and non-woven fabrics are usually It can be formed by means such as a cross lay method using a card or a random lay method using a fluid.

Polymers forming the porous synthetic resin skin layer of the present invention include polyurethane elastomer, polyvinyl chloride, polyamide,
Polyacrylic acid resin etc. can be used, but polyurethane elastomer is particularly preferred because it is easy to create a porous structure and has excellent durability such as bending resistance. It is a new resin.

These resins are neutralized and immersed in the IIIM substrate as an organic solvent or emulsion or slurry by a known method, and then coagulated to form a porous material by a known wet or dry method.

The density of porous material can be freely adjusted by KIQ depending on the solidification conditions, but 1
In order to fully express the pattern effect in the artificial leather of the present invention, α2 to α@I/d.

Desirably, the density is G, 3 to G, 7p/a11.

If the density is -2, which is lower than α217cd, the periphery pressed by the embossing will be uniformly depressed, making it difficult to clearly form the concave and convex portions, making it impossible to obtain a desired level of pattern.

On the other hand, if the density is higher than αsl/-, embossing itself becomes difficult and an uneven pattern cannot be obtained.

The thickness of the porous skin layer made by Tonoyo 5K is determined by the thickness of the final artificial leather and the balance between texture and thickness, but a01 to 13■ is the practical range. . If it is too thin, it will not be possible to give it unevenness by embossing and patterning will be difficult, and if it is too thin, it will have a rubber-like texture and lose its luxurious feel as artificial leather, which is not preferable.

Next, the pigment added to the synthetic resin forming the porosity can be organic, inorganic, or a mixture of both.

Further, the amount of such pigment added is 1 for the artificial leather Kl! of the present invention. The nobleness of the color of artificial leather, which makes the present invention most effective, can be explained as appropriate depending on the desired hue.
Color machine KK@.

The L value according to the model kcM-1!100) K is 2s or more and 90 or less, and the most desirable range is 30-80. The amount of pigment added is adjusted to achieve a density within this range, but it is usually 1 to 100% based on the solid content of the synthetic resin that forms the porous structure.
% by weight is practical. The amount of pigment added should be adjusted depending on the coloring power of the pigment. For example, in the case of carbon black, 2 to 5% by weight is a very effective amount when applied to the artificial leather of the present invention.

The artificial leather of the present invention also exhibits its effects when it has a thin resin film on its surface. This thin film is a001~αOS
It has a thickness of (3) and is formed using a gravure coater, a bar coater, lamination with release paper, etc. This thin film may be colored, or it may be a transparent film that is not colored, or it may be a 5K film that is coated with a transparent film on top of the colored film to give it a glossy effect.1 If it is colored, it may be made of porous synthetic resin. A color similar to the color of the epidermal layer is desirable; if the KJI color is too dark, it will not be possible to provide a color difference between the concave portions and convex portions even if embossing is performed, and the object of the present invention will not be achieved.

To explain in concrete numerical terms, the color depth when there is no thin film is 21s to 70 in L value as mentioned above, so when there is a thin film, the amount of pigment added and the film are adjusted so that the L value is 30 to 60. Adjust the thickness.

Next, conditions for applying embossing to give a pattern to the raw fabric thus prepared will be described. There are two methods for this: the commonly used embossing rule method and the embossing board method, both of which can be applied.

The embossing conditions are such that the temperature, pressure, and time are set so that the density of the part that is pressed to form a concave part on the surface of the leather and the other parts is at least a03F/a1. The density difference is (L
By setting ONE/a1 or more, it is possible to increase the pigment density of the epidermis forming the concave portions, and it is possible to produce a color difference between the concave portions and convex portions, thereby achieving the effects of the present invention.

! ! If the difference in density between the first part and the convex part is less than (L 03 jl /-), no difference in color density can be created on the surface.

A clear pattern cannot be obtained.

The actual embossing conditions differ depending on the thermal properties of the material and synthetic resin that make up the artificial leather, but the properties of the synthetic resin that is directly heated by # are important.

The appropriate temperature is preferably 5 to 30°C below the softening point of the synthetic resin. - The pressure during embossing is such that the method using the embossing rule requires a linear pressure of 51/m or more on a2, and the method using the embossing plate requires a linear pressure of 51/m or more. Then sky/a1 or higher is required.

The time is a factor that is determined naturally once the temperature and pressure are determined, and is usually carried out for about 0.5 to 2 seconds.

As described above, according to the present invention, it is possible to obtain a highly durable patterned artificial leather that has a high-grade appearance with a three-dimensional effect due to the difference in color between the embossed recesses and other parts.

The present invention will be further explained below with reference to Examples.

Yi 11 Single thread stirrup degree L2 denier! A 51 m polyester staple was randomly wefted and needle punched to create an intertwined non-woven right helix.

1 tetramethylene glycol to this nonwoven fabric.

(4'-diphenylmethane diisocyanate and polyester resin gelatin adipate) were combined to obtain a polynisder-based polyurethane elastomer with a concentration of 18
3% by weight organic brown pigment (8B-TJ-gono,
A polyurethane-impregnated porous substrate 0 having a density Q of 45 II/cd was prepared by adding a polyurethane-impregnated porous substrate (manufactured by Dainichiseika Chemical Co., Ltd.) and impregnating it into a pellet, followed by dry coagulation in a hot air dryer. The surface of the skin was coated with the above solution (6) to a weight of 5 solids after drying, and the skin was gelled and dried in a dryer so that the density of the skin became a48 filedk, thereby producing an artificial leather material D).

The artificial leather material obtained in this manner was subjected to heat embossing using an embossing plate having a floral pattern.

Embossing conditions are embossing plate density 140T, pressure 5K.
g/d for 10 seconds.

The patterned artificial leather thus obtained had a floral pattern in the concave portions, and the concave portions were much darker in color than the convex portions (non-embossed portions) of VC, giving an extremely rich three-dimensional effect.

The color difference between the concave and convex parts of this artificial leather is as shown in Table 1, and it is extremely a! A patterned artificial leather with accents was obtained.

s1 Table Example 2 Using the substrate C1 used in Example 1, a solution containing no pigment was coated with polyquintan solution (510051/wl) to a thickness of α2■ after drying, and gluing drying was performed. An artificial leather material was created.

This artificial leather is a two-layer type having a white porous epidermis with no pigment on the surface and a brown lower skin layer.

When the same embossing as in Example 1 was performed using this artificial leather raw fabric, the convex portions that were not embossed were white, and the concave portions became denser and became transparent film-like, and these portions changed the color of the substrate C). Artificial leather having an embossed pattern with an extremely three-dimensional effect was obtained, and the surface properties of the artificial leather at this time were as shown in Table 2.

Table 2 L4 Example 3 On the artificial leather raw fabric O used in Example 1, the paint shown below was applied with solid content s I/d using a gravure roll to create a colored artificial leather raw fabric F). did.

Using this original fabric (G), heating with a kid pattern
The surface temperature was 140°C when embossed.

When heat embossing was carried out at a pressure of o, SklI/C11, and a speed of zsm/min, patterned artificial leather was obtained which was more glossy than in Example 1 and had a deeper color.

The properties of this artificial leather are shown in the VGS table.

gS Table Example 4 A transparent polyurethane solution prepared with the following composition was applied to the surface of the artificial leather raw fabric η prepared in Example 3 using a gravure roll to give a ratio of 21/d to a glossy artificial leather raw fabric 0. Created.

When this original fabric was embossed in exactly the same way as in 5Jil Example 3, it was very shiny and the normal line of one color was the same as in Example 3.
An artificial leather with an increased pattern was obtained.

Comparative Example 1 An artificial leather material was prepared under uniform gelling conditions without adding any pigment to the bonded nonwoven fabric (AI K) used in Example 1 and the polyurethane solution (81) also used in Example 1.

The original fabric had a surface layer density of α4s#/d and was white and opaque.

When this original fabric was embossed under exactly the same conditions as in Example 1, an uneven pattern could be imparted, but only an artificial leather with little color difference between the concave and convex portions of the embossing was obtained.

Comparative Example 2 The bonded nonwoven fabric used in Example 1 was impregnated with a polyurethane solution (using 81 and 3% by weight of an organic brown pigment added) and dry coagulated in a hot air dryer to give a density of o, ssl.
An artificial leather original fabric having a skin layer density of /d was prepared.

When the original fabric was embossed in exactly the same manner as in Example 1, as shown in Table 4, only an artificial leather with a slight difference in color between concave and convex portions was obtained, although there was a slight uneven pattern.

1s4 table

Claims (1)

[Scope of Claims] L: An artificial leather having a slender base material and a porous synthetic resin skin layer, the base material and/or the skin layer containing a colored pigment, and the surface of the skin layer containing a colored pigment. A patterned artificial leather that is characterized by having large-density concavities. 1. The artificial leather according to claim A1M1, wherein the skin layer has a thin resin film on its surface. 1 The density difference between the concave part and other parts of the epidermal layer is aom~a
The artificial leather according to claim S (1) or (8), which is so#/d. It is made up of a embroidery base material and a porous synthetic resin skin layer.
Artificial leather containing a coloring pigment on at least one side of the leather is heated and embossed.
A density difference of s ~ a, sol/d will occur! Form the J section! ! 1. A method for producing patterned artificial leather, characterized in that when a convex pattern is imparted, it develops a deep color with concave areas. 1 Patent claim 1 in which the skin layer has a thin resin film on its surface! ! @The method for producing patterned artificial leather described in Section 4.