WO2016153063A1 - Release sheet and resin leather - Google Patents

Abstract

Provided is a release sheet having a base material, and a release layer placed over the base material, and provided on the surface with a unit pixel transfer portion group in which a plurality of unit pixel transfer portions are arranged. Corrugated patterns of at least five lines are arranged cyclically in one direction within the unit pixel transfer portions, the lengthwise direction of the corrugated pattern of one of the unit pixel transfer portions and the lengthwise direction of the corrugated pattern of the other of the unit pixel transfer portions among any two adjacent unit pixel transfer portions within the unit pixel transfer portion group being in an intersecting relationship.

Description

Release sheet and resin leather

This disclosure relates to a release sheet and resin leather. In particular, the present invention relates to a release sheet capable of producing a resin leather that exhibits design properties by light diffraction and interference, and a resin leather obtained using the release sheet.

Resin leather such as synthetic leather can be manufactured by peeling the release sheet after coating and curing the resin composition as a raw material on the release sheet having peelability on the surface, The skin layer formed by the resin composition has a texture and color similar to natural leather.
In recent years, optical design has been required for resin leather, and in order to produce such resin leather, various devices have been studied for release sheets. For example, Patent Documents 1 and 2 propose a release sheet having a hologram-like fine unevenness on the surface, and synthetic leather obtained using such a release sheet is a hologram attached to the skin layer. Due to the fine concavo-convex shape, the entire surface can be rainbow-colored.

In addition, in this specification, the resin leather is a leather simulating natural leather formed of a resin, and is a generic name for synthetic leather and artificial leather.

JP-A-4-361671 JP 2010-2537779 A

Patent Documents 1 and 2 disclose a technique in which a glossy color changes greatly when a light from a surface light source is applied to a resin leather to develop a design. On the other hand, there is also a demand for a resin leather that exhibits design properties by applying a light from a surface light source so that the change in glossy color is small and the gloss of the displayed pattern or color is enhanced. For example, when light from a surface light source is applied to the surface of a resin leather, the “light” caused by the strong surface shining in a certain viewing direction range (viewing area) is suppressed, and the color and pattern of the resin leather are increased. Glossy and clear visual recognition is possible, but the appearance of design is expected by clearly displaying glossy patterns and colors according to the visual recognition direction, such that such visual recognition is not possible in another visual recognition area. Is done.

As a result of the inventor's earnest study to realize a resin leather having such design properties, in a release sheet used for the production of resin leather, a unidirectional line shape, a bidirectional lattice shape, etc. It has been found that by forming a concavo-convex pattern, the resulting resin leather can express desired design properties.
This is because the uneven pattern given to the surface of the release sheet is shaped on the surface of the resin leather, so that the light hitting the surface of the resin leather is diffracted in the uneven pattern and light interference occurs. Due to the diffracted light and interference light generated at this time (hereinafter sometimes referred to as “diffracted light, etc.” in general), the resin leather displays a highly glossy color and pattern with reduced “light”. Is possible.

However, as a result of further intensive studies by the present inventors, when the uneven pattern applied to the resin skin surface is a unidirectional line, the region where diffracted light is generated with respect to the light from the surface light source is limited. In addition, the region where the interference light is generated is also limited. For this reason, it discovered that there existed the new problem that the angle dependence of a visual recognition direction produced that the direction in which the color and pattern of a resin leather can be visually recognized with high glossiness is limited to one direction.
Moreover, when the uneven | corrugated pattern attached | subjected to the resin skin surface is a two-way grid | lattice form, since the diffracted light and interference light arise in multiple directions, the above-mentioned angle dependence can be eliminated. However, when manufacturing a resin leather using a release sheet, it is difficult to accurately mold a concavo-convex pattern. For this reason, it has also been found that there is a problem that the dimensional accuracy of the concavo-convex shape attached to the surface of the resin leather affects the diffraction and interference of light and the desired designability cannot be obtained.

In order to solve the above problems, the present inventors conducted further intensive studies. The inventors of the present invention use, as a unit pixel, one partitioned region in which a plurality of line-shaped uneven patterns are arranged in a certain direction on the surface of the resin leather. Then, a plurality of the unit pixels are arranged such that the longitudinal directions of the concave and convex patterns of the adjacent unit pixels are in an intersecting relationship. As a result, it has been found that since the diffracted light and the interference light are generated in multiple directions with respect to the light from the surface light source, the angle dependency in the viewing direction can be eliminated. As a result, it has been found that it is possible to display high-gloss and clear colors and patterns with reduced “shine” without any change in glossy color regardless of the viewing direction. . In addition, the release sheet that enables the production of such resin leather can easily and accurately transfer the uneven pattern on the resin leather surface.

In addition, such resin leather can exhibit design characteristics that do not depend on the viewing direction even for light from a point light source. In this case, the design characteristics are different from those in the case where light from a surface light source strikes. It has also been found that the expression of is possible. That is, the resin leather having the above-described structure on the surface receives light from a point light source, and causes diffraction and interference of light in the direction perpendicular to the longitudinal direction of the concavo-convex pattern in each unit pixel. The longitudinal directions of the concavo-convex patterns of adjacent unit pixels are in an intersecting relationship, and light is dispersed in a specific direction in each unit pixel in this way, so that the resin leather is spectrally separated regardless of the viewing direction. It is possible to display a pattern having a glitter feeling due to diffracted light or the like corresponding to the direction.

The present invention has been made on the basis of such knowledge, and displays a highly glossy and clear color and pattern with respect to the light from the surface light source, regardless of the viewing direction, to the light from the point light source. To provide a release sheet capable of easily and accurately producing a resin leather capable of displaying a pattern having a glittering feeling, and a resin leather obtained using the release sheet. Main purpose.

One embodiment of the present invention includes a base material, and a release layer that is located on the base material and includes a unit pixel transfer portion group having a plurality of unit pixel transfer portions arranged on the surface. In the unit pixel transfer portion, at least five or more line-shaped uneven patterns are periodically arranged in one direction, and in the unit pixel transfer portion group, of the two adjacent unit pixel transfer portions. A release sheet is provided in which the longitudinal direction of the concavo-convex pattern of one unit pixel transfer portion and the longitudinal direction of the concavo-convex pattern of the other unit pixel transfer portion intersect each other.

One embodiment of the present invention is a release sheet having a unit pixel transfer unit group on which a plurality of unit pixel transfer units are arranged on the surface, and the unit pixel transfer group extends along a first axis. A first unit pixel transfer portion having a concavo-convex pattern composed of a plurality of line-shaped recesses and projections, and a plurality of portions adjacent to the first unit pixel transfer portion and extending along a second axis A second unit pixel transfer portion having a concavo-convex pattern composed of line-shaped concave portions and convex portions, and a plurality of line shapes adjacent to the second unit pixel transfer portion and extending along the third axis At least a third unit pixel transfer portion having a concavo-convex pattern composed of a concave portion and a convex portion, wherein the first axis and the second axis are in a crossing relationship, and the second axis And the third axis is the release sheet in the cross relationship Subjected to.

One embodiment of the present invention has a support layer and a resin skin layer provided on the surface with a unit pixel group in which a plurality of unit pixels are arranged on the support layer, and at least five in the unit pixel. The above-described line-shaped uneven patterns are periodically arranged in one direction, and in the unit pixel group, of the two adjacent unit pixels, the longitudinal direction of the uneven pattern of one of the unit pixels Further, the present invention provides a resin leather in which the longitudinal direction of the concavo-convex pattern of the other unit pixel intersects.

The release sheet according to an embodiment of the present invention can display a high-gloss and clear color or pattern by diffracted light or the like with respect to light from a surface light source regardless of the viewing direction, and a point light source The effect is that a resin leather capable of displaying a pattern having a radiant feeling due to diffracted light or the like can be easily and accurately manufactured with respect to the light from the light.
Moreover, the resin leather which concerns on one Embodiment of this invention has the effect that the different designability by a diffracted light etc. can be expressed according to the kind of light source irrespective of a visual recognition direction.

It is the schematic sectional drawing and top view which show an example of the release sheet which concerns on one Embodiment of this invention. FIG. 6 is an enlarged plan view and an XX cross-sectional view showing an example of a unit pixel transfer portion group. It is a schematic sectional drawing for demonstrating the uneven | corrugated pattern of a unit pixel transfer part. It is a schematic sectional drawing for demonstrating the uneven | corrugated pattern of a unit pixel transfer part. It is an enlarged plan view of a unit pixel transfer part group in another example of a release sheet according to an embodiment of the present invention. It is a schematic plan view for demonstrating the arrangement | positioning aspect of the unit pixel transfer part in a unit pixel transfer part group. It is a schematic sectional drawing which shows the other example of the release sheet which concerns on one Embodiment of this invention. It is an enlarged plan view showing an example of a unit pixel transfer portion group. It is an enlarged plan view showing an example of a unit pixel transfer portion group. It is the schematic sectional drawing and top view which show an example of the resin leather which concerns on one Embodiment of this invention. FIG. 5 is an enlarged plan view and an XX cross-sectional view of a unit pixel portion group. It is a schematic diagram which shows the usage example of the resin leather which concerns on one Embodiment of this invention. It is a schematic plan view which shows a part of release sheet of an Example. It is explanatory drawing for demonstrating the display pattern by point light source irradiation of the synthetic leather obtained by the release sheet of the Example.

Hereinafter, a release sheet and resin leather according to an embodiment of the present invention will be described in detail.

A. Release Sheet A release sheet according to an embodiment of the present invention (hereinafter, may be referred to as a release sheet of the present embodiment) is located on the base material and the base material, and transfers a plurality of unit pixels. A release layer provided on the surface with a unit pixel transfer portion group in which the portions are arranged, and within the unit pixel transfer portion, at least five line-shaped uneven patterns are periodically formed in one direction. In the unit pixel transfer part group, among the two adjacent unit pixel transfer parts, the longitudinal direction of the uneven pattern of one of the unit pixel transfer parts and the unevenness of the other unit pixel transfer part The longitudinal direction of the pattern is in an intersecting relationship.

The release sheet of this embodiment will be described with reference to the drawings. Fig.1 (a) and FIG.1 (b) are the schematic sectional drawing and top view which show an example of the release sheet which concerns on one Embodiment of this invention. FIG. 2A is an enlarged plan view of a part of the unit pixel transfer portion group, and corresponds to an enlarged view of a Z portion in FIG. FIG. 2B is a cross-sectional view taken along the line XX of FIG. 2A and is a schematic cross-sectional view of the unit pixel transfer portion.
A release sheet 10 shown in FIGS. 1 and 2 is provided with a base layer 1 and a release layer that is located on the base member 1 and has a unit pixel transfer unit group on the surface of which a plurality of unit pixel transfer units 11 are arranged. 2.
In the unit pixel transfer section 11, at least five line-shaped uneven patterns 111 are periodically arranged in one direction. The concave / convex pattern 111 includes a concave pattern (concave portion) 111a having a line shape in plan view, and a convex pattern (convex portion) 111b having a line shape in plan view alternately with the longitudinal direction being the same direction. Are arranged in a plurality. In FIG. 2B, the concave pattern (concave portion) 111a is composed of four pieces (111a ₁ to 111a ₄ ) and the convex pattern (convex portion) 111b is composed of four pieces (111b ₁ to 111b ₄ ). Have an uneven pattern.
Further, in the unit pixel transfer part groups, two adjacent unit pixels transfer unit 11A, among 11B, the concave-convex pattern 111A of one unit pixel transfer unit 11A and the longitudinal direction L _A, of the other unit pixel transfer unit 11B the longitudinal direction _{L B} of the concavo-convex pattern 111B is, the intersection relation.

When the light from the surface light source hits the surface of the resin leather, the present inventors cause light diffraction and interference on the surface of the resin leather, and using these diffracted lights, the pattern of the resin leather It has been found that the glossiness of the color can be enhanced, and the designability different from the designability due to the change in the color of the conventional glossy color can be expressed.
And as a specification of the release sheet for manufacturing such a resin leather, since it is necessary to attach the shape which can produce diffraction and interference of light on the resin leather surface, for example, of a release sheet It is conceivable that the surface has a concavo-convex pattern such as a unidirectional line or a bi-directional lattice.

However, when the surface of the release sheet has only a unidirectional line-shaped uneven pattern, the surface of the resin leather is uneven when light from a surface light source is applied to the resin leather obtained by the release sheet. The diffraction direction of the light generated in the pattern is limited to the direction intersecting the long direction of the concavo-convex pattern. For this reason, when the resin leather is viewed along the longitudinal direction of the line-shaped uneven pattern, a desired color and pattern cannot be visually recognized because the viewing direction matches the direction in which light diffraction does not occur. As described above, the unidirectional line-shaped uneven pattern has an angle dependency in the visual recognition direction in which the color and pattern of the resin leather can be visually recognized with high gloss.

Moreover, when the surface of the release sheet has a concavo-convex pattern that is a lattice pattern in two directions, when light from a surface light source is applied to the resulting resin leather, the light diffraction direction is not limited to one direction, and the lattice shape Accordingly, interference light is generated in multiple directions. For this reason, the said angle dependence is eliminated, and it becomes possible for resin leather to display a high gloss and clear color and pattern irrespective of a visual recognition direction with respect to the light from a surface light source. However, it is not easy to mold a lattice-like uneven pattern on the surface of the resin leather using a release sheet. If the uneven pattern of the release sheet is not accurately transferred to the surface of the resin leather, the light diffraction tendency and the pattern of interference fringes on the uneven pattern formed on the surface of the resin leather will change. It becomes difficult to express.

On the other hand, in the release sheet of the present embodiment, one partition region in which a plurality of lines are periodically arranged with the longitudinal direction of the line-shaped uneven pattern defined as one direction is defined as a unit pixel transfer portion. . Further, in the unit pixel transfer unit group which is an aggregate of a plurality of unit pixel transfer units, the unit pixel transfer unit is arranged so that the longitudinal direction of the concave and convex pattern intersects with the adjacent unit pixel transfer unit. ing. By adopting the above structure for the unit pixel transfer unit and the unit pixel transfer unit group, the unit pixel transfer unit alone has a concavo-convex pattern showing one direction, while the unit pixel transfer unit group as a whole has two or more directions. Will have a pattern.

The resin leather obtained from the release sheet according to the present embodiment is transferred with the unit pixel transfer portion of the release sheet and the unit pixel transfer portion group that is an aggregate of the unit pixel transfer portion and the unit pixel and the aggregate on the surface. A certain unit pixel group is provided. For this reason, the resin leather also has a concavo-convex pattern indicating two or more directions in the entire unit pixel group while the unit pixel has a concavo-convex pattern in one direction. Then, when light from a surface light source strikes such a resin leather, it becomes possible to cause light diffraction and interference in multiple directions in the same manner as a lattice-shaped uneven pattern.
As described above, the resin leather obtained from the release sheet of the present embodiment has a high gloss and clear color in which “shine” is suppressed while maintaining a glossy color against the light from the surface light source. It is possible to display the handle and the pattern regardless of the viewing direction.

In addition, the resin leather obtained from the release sheet of the present embodiment can exhibit design characteristics different from the case where the light from the surface light source hits when the light from the point light source hits it.
When light from a point light source strikes the resin leather surface, light diffraction and interference occur in the direction perpendicular to the longitudinal direction of the concave / convex pattern in each unit pixel. The longitudinal directions of the concavo-convex patterns of adjacent unit pixels are in an intersecting relationship, and the light is dispersed in a specific direction in each unit pixel in this manner, so that the resin leather has a spectral direction regardless of the viewing direction. It is possible to express a pattern having a glittering feeling due to diffracted light or the like according to the above. The pattern to be expressed at this time is designed according to the number of the direction indicated by the longitudinal direction of the concave / convex pattern in the unit pixel group, or the intersection of the concave / convex patterns of adjacent unit pixels.

In the release sheet of the present embodiment, a concavo-convex pattern indicating one direction is formed for each unit pixel transfer portion that transfers and forms each unit pixel. For this reason, when manufacturing the above-described resin leather capable of exhibiting the design properties, it is possible to transfer the uneven pattern of each unit pixel transfer portion with high accuracy.

That is, according to the release sheet of the present embodiment, the surface of the release sheet has the above-described structure, so that the light from the surface light source is highly glossy regardless of the viewing direction due to diffracted light or the like. In addition, it is possible to display clear colors and patterns without changing the color of the glossy color. On the other hand, the light from the point light source is dispersed in a specific direction regardless of the viewing direction. A resin leather capable of displaying a pattern having a glitter feeling due to diffracted light or the like can be easily and highly accurately manufactured.

Hereinafter, each configuration of the release sheet of the present embodiment will be described.

1. Release layer The release layer is a layer that is located on the substrate and has a unit pixel transfer portion group on the surface, on which a plurality of unit pixel transfer portions are arranged.

(1) Unit Pixel Transfer Unit Group The unit pixel transfer unit group includes a plurality of unit pixel transfer units.

(A) Unit Pixel Transfer Unit In the unit pixel transfer unit, a line-shaped uneven pattern including one or more line-shaped concave patterns and convex patterns is arranged. For example, at least five line-shaped uneven patterns are arranged. , Are periodically arranged in one direction.

Here, the line-shaped concavo-convex pattern refers to a structure in which a planar shape is composed of a line-shaped convex pattern and a concave pattern, and a plurality of convex patterns and concave patterns are alternately arranged. The convex pattern and the concave pattern constituting the concave / convex pattern may be referred to as a convex portion and a concave portion, respectively. Further, the plan view means viewing from the surface provided with the unit pixel transfer portion group of the release layer. In the case of the resin leather described later, the plan view means that the resin leather is viewed from the surface having the unit pixel group of the resin skin layer.

Also, the line-shaped uneven pattern is periodically arranged in one direction means that convex patterns (convex parts) and concave patterns (concave parts) are alternately arranged in one direction, It means that the longitudinal direction of a pattern (convex part) and a concave pattern (concave part) is aligned in the same direction.

In addition, the longitudinal direction of the concave / convex pattern refers to the longitudinal direction of the concave pattern and the convex pattern in plan view, and the longitudinal direction may be referred to as an “axis” along which the concave pattern and the convex pattern extend.

That is, “in the unit pixel transfer portion, at least five or more line-shaped uneven patterns are periodically arranged in one direction” means that “in the unit pixel transfer portion, a plurality of recesses and protrusions are present. It has a concavo-convex pattern composed of five or more arranged alternately in one direction, and the plurality of the concave portions and the convex portions are line shapes whose planar view shape extends along one axis. '' be able to.

The concave pattern and the convex pattern constituting the concavo-convex pattern have a line shape in plan view and are usually linear. The cross-sectional shapes of the convex pattern and the concave pattern are not particularly limited, and examples thereof include a rectangle such as a square and a rectangle, a trapezoid, a triangle, a semicircle, a parabola, a bell, and a hyperbola. Among these, a trapezoid is preferable. When the resin leather is manufactured using the release sheet of the present embodiment, the concave pattern and the convex pattern constituting the concave / convex pattern in the unit pixel transfer portion have inclined side surfaces, and thus can be easily transferred to the resin leather surface. Because you can. Moreover, in the resin leather obtained by the release sheet of the present embodiment, light easily interferes between the trapezoidal concave pattern and the convex pattern of each unit pixel, so that the design properties according to the type of light source are expressed. It is easy to do.
The convex pattern and the concave pattern may have the same cross-sectional shape or may be different as shown in FIG. 3A to 3E are schematic views showing examples of the cross-sectional shape of the concavo-convex pattern in the direction orthogonal to the longitudinal direction.

Further, the cross-sectional shape of the concavo-convex pattern in the direction orthogonal to the longitudinal direction is determined according to the cross-sectional shape of the concave pattern and the convex pattern alternately arranged, for example, square wave, trapezoidal wave, sine waveform, triangular waveform, A sawtooth wave etc. are mentioned.

The top of the convex pattern of the concave / convex pattern or the bottom of the concave pattern may be a flat surface, may be sharp, or may have a curved surface.

Further, as shown in FIG. 4A, the concave / convex pattern 111 has the bottom of the concave pattern 111a in the same plane as the surface S of the release layer 2, and the top of the convex pattern 111b of the release layer 2. It may be located above the surface S in the thickness direction. As shown in FIG. 4B, the top of the convex pattern 111b is in the same plane as the surface S of the release layer 2, and the concave pattern The bottom of 111a may be located below the surface S of the release layer 2 in the thickness direction.

In the case of FIG. 4A, the part of the release layer 2 protruding from the surface S can be a convex pattern 111b, and the part without the release layer 2 adjacent to the convex pattern 111b can be a concave pattern 111a. As shown in FIG. 4A, the number of the concave patterns 111a and the convex patterns 111b is four for the concave patterns 111a and three for the convex patterns 111b, which is a total of seven patterns.
In the case of FIG. 4B, the portion recessed from the surface S is a concave pattern 111a, and the portion of the release layer 2 formed between the concave pattern and the concave pattern located next to it is a convex pattern. 111b. As shown in FIG. 4B, the number of the concave patterns 111a and the convex patterns 111b includes three concave patterns 111a and four convex patterns 111b, which is a total of seven patterns.

3B to 3D, with respect to the reference line R virtually provided between the bottom and the top of the concavo-convex pattern, the portion on the top side of the reference line R is the convex pattern 111b. A portion adjacent to the convex pattern 111b and having no release layer 2 is defined as a concave pattern 111a.

The width of the concave pattern of the concave / convex pattern and the width of the convex pattern (hereinafter sometimes referred to as pattern width) are the sum of the width of the convex pattern and the width of the concave pattern adjacent to the convex pattern, respectively. What is necessary is just to become the magnitude | size of the uneven | corrugated pattern pitch. The width of the convex pattern and the width of the concave pattern may be equal or different.
When the width of the concave pattern and the width of the convex pattern are different, the ratio of the width of the concave pattern to the width of the convex pattern may be in the range of 1: 9 to 9: 1, preferably 3: 7 to 7 : Within the range of 3. When the ratio is out of the above range, in the unit pixel of the resin leather obtained by the release sheet of the present embodiment, when light diffraction and interference do not occur sufficiently, the desired design depending on the type of the light source is not expressed There is.
The width of the concave pattern and the width of the convex pattern refer to the length in the direction orthogonal to the longitudinal direction L in plan view of the concave pattern and the convex pattern. In FIG. 2 (b) and FIG. 3 (a) ~ (e) in the width of the concave pattern is a portion indicated by D _a, the width of the convex pattern is a portion indicated by D _b.

The lengths of the concave pattern and the convex pattern in the longitudinal direction are appropriately set according to the dimensions of the unit pixel transfer portion in plan view.

In the unit pixel transfer portion, the concavo-convex pattern is periodically arranged in one direction. That is, the plurality of concave patterns and the plurality of convex patterns constituting the concavo-convex pattern are periodically and alternately arranged along one direction.
The pitch of the concavo-convex pattern (concavo-convex cycle) may be any size as long as diffracted light or the like is visible in the resin leather obtained by the release sheet of the present embodiment, and is preferably 3 μm or more and 60 μm or less, for example. In particular, the thickness is preferably 5 μm or more and 30 μm or less. If the pitch of the concavo-convex pattern of the unit pixel transfer part is out of the above range, in the resin leather obtained by the release sheet of this embodiment, light diffraction and interference by the unit pixel group are less likely to occur and it is difficult to visually recognize the diffracted light. Therefore, the desired designability according to the type of light source may not be expressed. Further, when the pitch of the uneven pattern of the unit pixel transfer part is smaller than the above range, the resin leather obtained by the release sheet of the present embodiment has a desired change in gloss color with respect to the light from the surface light source. It may not be possible to obtain the design properties.
The pitch of the concavo-convex pattern refers to the sum of the width of the adjacent convex pattern and the width of the concave pattern, that is, the sum of the width of one convex pattern and the width of the concave pattern adjacent to the one convex pattern. 2 (b) and FIGS. 3 (a) to 3 (e) are portions indicated by P. FIG.

The uneven step of the uneven pattern of the unit pixel transfer portion may be any size as long as diffracted light and interference light are generated in the resin leather obtained by the release sheet of the present embodiment, for example, larger than 0.05 μm and larger than 20 μm. Is preferably small, and more preferably in the range of 0.1 μm to 3 μm. When the uneven step is larger than the above range, it may be difficult to transfer to the resin leather surface when the resin leather is produced using the release sheet. On the other hand, if the uneven step is smaller than the above range, the resin leather obtained from the release sheet is less likely to generate diffracted light and interference light, and the desired design depending on the type of light source may not be expressed.
The uneven step of the uneven pattern of the unit pixel transfer portion refers to the distance from the top of the convex pattern to the bottom of the concave pattern adjacent to the convex pattern, and is shown in FIGS. 2 (b) and 3 (a) to (e). ) In T).

The shape of the unit pixel transfer portion in plan view is not particularly limited as long as it has a desired line-shaped uneven pattern and has a desired aspect ratio described later.For example, a triangle, a rectangle such as a square or a rectangle, Examples include polygons such as hexagons, regular polygons, and circles.

The aspect ratio of the unit pixel transfer portion is preferably in the range of 10: 1 to 1:10, and more preferably in the range of 5: 1 to 1: 5. If the aspect ratio of the unit pixel transfer portion is larger than the above range, moire may occur in the resin leather obtained from the release sheet of this embodiment, and the desired design may not be expressed.
The aspect ratio of the unit pixel transfer part is the ratio of the two sides that are orthogonal to the square or the ratio of the long side to the short side of the rectangle, assuming the smallest square or rectangle circumscribing the unit pixel transfer part. Say.

The size of the unit pixel transfer portion in plan view may be any size as long as a desired number of uneven patterns can be provided in the unit pixel transfer portion. The length of one side of the unit pixel transfer portion is preferably 15 μm or more and 300 μm or less, and more preferably in the range of 25 μm or more and 80 μm or less.
When the length of one side of the unit pixel transfer portion is larger than the above range, the unit pixel is likely to be visually observed in the resin leather obtained by the release sheet of the present embodiment, and may be inferior in design. On the other hand, if the length of one side of the unit pixel transfer portion is smaller than the above range, the number of patterns per unit pixel transfer portion is reduced, and in the resin leather obtained by the release sheet of this embodiment, diffracted light and interference light May not be sufficiently obtained, and it may be difficult to develop desired design characteristics according to the type of light source.
The length of one side of the unit pixel transfer portion refers to the length of one side of the square or the length of the long side of the rectangle when a minimum square or rectangle circumscribing the unit pixel transfer portion is assumed.

Particularly, it is preferable that the unit pixel transfer portion has a rectangular shape in plan view and a side length of 15 μm or more and 300 μm or less.

The number of patterns included in the unit pixel transfer portion may be two or more. Further, it may be 5 or more per unit pixel transfer portion, preferably 5 or more and 1000 or less, and more preferably 10 or more and 100 or less. When the number of patterns included in the unit pixel transfer portion is larger than the above range, the unit pixel transfer portion becomes large, and the unit pixel may be easily visually recognized in the resin leather obtained by the release sheet of this embodiment. On the other hand, if the number of patterns contained in the unit pixel transfer portion is less than the above range, the intensity of diffracted light and interference light generated in the resin leather obtained by the release sheet of this embodiment will be weak, and the desired design will be exhibited. There are cases where it is not possible.
The number of patterns refers to the total number of concave patterns and convex patterns.

(B) Unit Pixel Transfer Unit Group The unit pixel transfer unit group includes a plurality of unit pixel transfer units. The unit pixel transfer unit group may be configured by the same unit pixel transfer unit, and is configured by a plurality of types of unit pixel transfer units having different shapes and dimensions of the concavo-convex pattern, a planar view shape of the unit pixel transfer unit, and the like. May be.

That is, the unit pixel transfer unit group may be configured by unit pixel transfer units having the same concavo-convex pattern, or may be configured by a plurality of types of unit pixel transfer units having different concavo-convex patterns.
The same concave / convex pattern means that the other than the longitudinal direction is the same, that is, the concave and convex patterns have the same cross-sectional shape, pitch, and concave / convex step.
The unit pixel transfer unit group may be configured by a plurality of unit pixel transfer units having the same planar view shape, or may be configured by a plurality of unit pixel transfer units having different plan view shapes.
Further, the unit pixel transfer part group may be composed of a plurality of unit pixel transfer parts having the same plan view shape and the same concave / convex pattern, and at least one of the plan view shape and the concave / convex pattern is different. These unit pixel transfer units may be used.

For example, the already described part Z of the unit pixel transfer unit group shown in FIG. 1B is composed of a plurality of unit pixel transfer units 11A and 11B having the same planar shape and the same concave / convex pattern. Has been.
Further, a part Z of the unit pixel transfer unit group shown in FIG. 5 includes a first unit pixel transfer unit 11A having a triangular shape in plan view, a second unit pixel transfer unit 11B having a quadrangular shape, and a pentagonal first unit pixel transfer unit 11B. An example in which the first unit pixel transfer unit 11A, the second unit pixel transfer unit 11B, and the third unit pixel transfer unit 11C have the same concavo-convex pattern. Indicates.
FIG. 5 will be described in the section “B. Other aspects”.

Within the unit pixel transfer portion group, of the two adjacent unit pixel transfer portions, the longitudinal direction of the concave / convex pattern of one unit pixel transfer portion and the longitudinal direction of the concave / convex pattern of the other unit pixel transfer portion Are in a cross relationship.
The longitudinal direction of the concavo-convex pattern of one of the unit pixel transfer portions of two adjacent unit pixel transfer portions and the longitudinal direction of the concavo-convex pattern of the other unit pixel transfer portion are, for example, shown in FIG. 6 (a), as illustrated in (b), the longitudinal direction L _a concavo-convex pattern of one of said unit pixel transfer section 11A, and the longitudinal direction L _B of the uneven pattern of the other of the unit pixel transfer unit 11B May be in an orthogonal relationship. Further, as illustrated in FIG. 6 (c), the longitudinal L _A concavo-convex pattern of one of said unit pixel transfer unit 11A, and the longitudinal direction L _B of the uneven pattern of the other of the unit pixel transfer unit 11B is, They may intersect at a desired angle (intersection angle θ = 45 ° in FIG. 6C).
The crossing angle between the longitudinal direction of the concave / convex pattern of one unit pixel transfer portion and the longitudinal direction of the concave / convex pattern of the other unit pixel transfer portion is not particularly limited.

The intersecting angle is an angle on the acute side of the angle formed by the two directions of the longitudinal direction of the concave / convex pattern of one unit pixel transfer portion and the longitudinal direction of the concave / convex pattern of the other unit pixel transfer portion. Point to.
In the following, when a specific value is given for the crossing angle, the value is understood to include an error or the like due to manufacturing to the extent that the effect exhibited by the present embodiment is not excessively impaired. For example, when the crossing angle is X °, it can be understood with a width of X ° ± 2 °. In addition, phrases indicating the degree of “orthogonal” or “parallel” are understood to include errors due to manufacturing and the like to such an extent that the effects of the present embodiment are not excessively impaired as described above.

Among these two adjacent unit pixel transfer portions 11, the longitudinal direction of the concave / convex pattern of one unit pixel transfer portion and the longitudinal direction of the concave / convex pattern of the other unit pixel transfer portion are orthogonal to each other. That is, the crossing angle is preferably 90 °. In the resin leather obtained by the release sheet of the present embodiment, for the light from the surface light source, it is possible to display a highly glossy and clear color or pattern by diffracted light or the like in a wider range. It is possible to set a wide viewing range in which the pattern can be visually recognized. On the other hand, for the light from the point light source, the design expressed by the diffracted light becomes a cross having a glitter feeling, so that the design can be improved.

In the release sheet of the present embodiment, the direction indicated by the longitudinal direction of the uneven pattern in the unit pixel transfer portion group may be two or more. That is, in the unit pixel transfer unit group, as illustrated in FIGS. 6A and 6B, two types of unit pixel transfer units 11A in which the longitudinal directions L _A and L _B of the concavo-convex pattern intersect, 11B may be arranged, and as illustrated in FIG. 6C, three or more types of unit pixel transfer portions 11A to 11D in which the longitudinal directions L _A to L _D of the concavo-convex pattern intersect are arranged. It may be.

In the case where two types of unit pixel transfer portions in which the longitudinal direction of the concavo-convex pattern intersects are arranged, the direction indicated by the longitudinal direction of the concavo-convex pattern in the unit pixel transfer portion group is two directions. On the other hand, when three or more types of unit pixel transfer portions whose longitudinal directions of the concavo-convex pattern are crossed are arranged, the direction indicated by the longitudinal direction of the concavo-convex pattern in the unit pixel transfer portion group is three or more directions.

In the resin leather obtained by the release sheet of the present embodiment, the angle dependency of the viewing direction with respect to the light from the surface light source is set so that the longitudinal direction of the uneven pattern in the unit pixel transfer unit group is two or more directions. Can be further reduced. In addition, for light from a point light source, the spectral direction can be controlled in multiple directions, so the shape of the pattern displayed by diffracted light can be designed, and the spectral direction becomes multidirectional. The brightness of the pattern can be improved.

For example, if the direction indicated by the longitudinal direction of the concavo-convex pattern in the unit pixel transfer portion group is two directions as shown in FIGS. 6A and 6B, the resin leather obtained by the release sheet of the present embodiment The direction indicated by the longitudinal direction of the concavo-convex pattern in the unit pixel group is also two directions, and a cross pattern having glitter is displayed.
On the other hand, if the direction indicated by the longitudinal direction of the concavo-convex pattern in the unit pixel transfer unit group is four directions as shown in FIG. 6C, the unit pixel group of the resin leather obtained by the release sheet of the present embodiment. The direction indicated by the longitudinal direction of the concave / convex pattern is also four directions, and a pattern having a radial radiant feeling in which diffracted light extends in eight directions is displayed.

Further, when the release sheet of the present embodiment has a long shape, the longitudinal direction of the uneven pattern in each unit pixel transfer portion is the same as the longitudinal direction MD of the release sheet 10 as illustrated in FIG. They may be parallel or orthogonal, and as illustrated in FIG. 6B, a desired inclination angle with respect to the longitudinal direction MD of the release sheet 10 (inclination angle θ = 45 ° in FIG. 6B). ).
Among them, the longitudinal direction of the concave / convex pattern of one unit pixel transfer portion and the concave / convex pattern direction of the other unit pixel transfer portion are inclined by 45 ° with respect to the longitudinal direction of the release sheet. More preferred.
This is because, when the resin leather is manufactured using the release sheet of the present embodiment, the transfer accuracy of the uneven pattern is improved, and the uneven pattern can be easily and highly accurately transferred to the resin leather surface.

The plurality of unit pixel transfer units are usually arranged without intervals. However, the unit pixel transfer units may have intervals depending on the planar view shape of the unit pixel transfer unit, such as when the planar view shape of the unit pixel transfer unit is circular. May be arranged. When a plurality of the unit pixel transfer portions have an interval, the size of the interval is a size that does not hinder the generation of diffracted light by the unit pixel in the resin leather obtained by the release sheet of the present embodiment. Good.

(2) Release layer The release layer material can form a release layer having a desired unit pixel transfer portion group on the surface, and the resin leather using the release sheet of the present embodiment. Any material can be used as long as the resin leather can be easily peeled off during production. Examples of the material include resins such as thermoplastic resins and cured resins. The cured resin refers to a resin (thermosetting resin) obtained by heating and curing a thermosetting resin, or a resin (ionizing radiation curable resin) obtained by curing an ionizing radiation resin by irradiation with ionizing radiation. Examples of the ionizing radiation curable resin include an ultraviolet curable resin and an electron beam curable resin.
Here, “ionizing radiation” refers to radiation having an energy quantum capable of polymerizing or crosslinking molecules among electromagnetic waves or charged particle beams. For example, in addition to ultraviolet rays and electron beams, electromagnetic waves such as X rays and γ rays are used. And charged particle beams such as α rays and ion rays. Of these, ultraviolet rays and electron beams are preferred.

Examples of the thermoplastic resin include acrylic resins such as polymethyl methacrylate; polyolefin resins such as polyethylene, polypropylene, and polymethylpentene; polyester resins such as polyethylene terephthalate and polybutylene terephthalate; styrene resins such as polystyrene; Conventional resins such as vinyl resins such as vinyl chloride, polycarbonate resins, silicone resins, polyvinyl alcohol, and copolymers disclosed in JP-A-2015-27811 can be used.

Examples of the thermosetting resin include unsaturated polyester, melamine, epoxy, polyester (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, polyether (meth) acrylate, polyol (meth) acrylate, melamine ( And (meth) acrylate and triazine acrylate.
Examples of the ionizing radiation curable resin include urethane resins, epoxy resins, ester resins, acrylic resins, acrylic ester copolymers, and the like.

Among these, the release layer preferably contains a thermoplastic resin, and the release layer more preferably contains polypropylene. The desired unit pixel transfer part group can be formed with high accuracy on the surface of the release layer, and when the resin leather is produced using the release sheet of this embodiment, the peelability from the resin leather is good. Because it becomes.

The release layer may be transparent, translucent or opaque. The release layer may be colored.

The release layer may have any thickness as long as it has a unit pixel transfer portion having a desired shape and a unit pixel transfer portion group as an aggregate thereof on the surface, for example, within a range of 1 μm to 200 μm. A range of 20 μm to 50 μm is preferable. If the thickness of the release layer is larger than the above range, the amount of material used for forming the release layer and its cost, and the manufacturing cost of the entire release sheet may increase. On the other hand, if the thickness of the release layer is smaller than the above range, it may not be possible to provide a unit pixel transfer portion having a desired shape and a unit pixel transfer portion group that is an aggregate thereof. In addition, the thickness of a mold release layer is a part shown by H in FIG.2 (b).

In addition, a release layer may be provided on the surface of the release layer including the unit pixel transfer portion group. This is because releasability is improved in the production of resin leather. Examples of the material for the release layer include silicone-based resins and fluorine-based resins, which can be formed by applying and drying these resins.
The thickness of the release layer may be any thickness that does not impair the concavo-convex pattern of the unit pixel transfer portion, and is preferably about 0.1 μm to 3 μm, for example. This is because if it is below the above range, the peel force may be insufficient, while if it is above the above range, the deviation from the desired uneven pattern becomes large.

2. Substrate The substrate supports the release layer.
The base material is not particularly limited as long as a release layer can be formed, and examples thereof include conventionally known base materials used for release sheets for resin leather production and process paper.
Specifically, paper such as kraft paper, fine paper, cast coated paper, polyester such as polyethylene terephthalate and polyethylene naphthalate, polyamide such as various nylons, resin film such as polypropylene, synthetic paper, metal foil, woven fabric, non-woven fabric Etc. can be used. These can be used alone or appropriately laminated.
Among these, paper is preferable as the substrate because the resin leather is less likely to be thermally deteriorated and has high adhesion to the release layer when the resin leather is produced using the release sheet of the present embodiment.

Further, when the substrate is a resin film, the resin used for the resin film may be the same as the resin forming the release layer described above. In this case, the substrate and the release layer may be integrated.

The thickness of the base material is not particularly limited and can be set as appropriate according to the material of the base material, but is preferably set within a range of 50 μm to 200 μm, for example.

Even if the surface of the release layer side of the substrate is subjected to surface treatment such as corona discharge treatment, easy adhesion treatment such as ozone treatment or primer coating for the purpose of improving adhesion with the release layer. Good.

3. Arbitrary Layer The release sheet of the present embodiment may have an optional layer as necessary in addition to the release layer and the substrate.
For example, when the surface of the substrate is not smooth, a smoothness improving layer may be provided between the substrate and the release layer so that the release layer can be formed uniformly. Examples of the smoothness improving layer include a smoothness improving layer having a composition disclosed in JP 2002-086622 A, a clay coat layer, and the like.

Further, a primer layer may be provided between the base material and the release layer. This is because the adhesion between the substrate and the release layer can be improved. Examples of the material for the primer layer include a fluorine-based coating agent and a silane coupling agent.

4). Others In the release sheet of this embodiment, the release layer and the substrate may be integrated. That the release layer and the base material are integral means that the release layer 2 and the base material 1 are a single layer 5 formed of the same material, as illustrated in FIG. Examples of the material constituting the single layer include the materials described in the section “1. Release layer”.
Since the unit pixel transfer portion, the unit pixel transfer portion group, and the like in the release sheet in which the release layer and the base material are integrated are the same as those already described, description thereof is omitted here.

5. Other Aspects Another aspect of the release sheet of the present embodiment (hereinafter referred to as this aspect in this section) is a mold release having a unit pixel transfer portion group having a plurality of unit pixel transfer portions arranged on the surface. The unit pixel transfer group is a sheet, wherein the unit pixel transfer group includes a first unit pixel transfer unit having a concavo-convex pattern composed of a plurality of line-shaped recesses and projections extending along a first axis, and the first unit pixel transfer unit. A second unit pixel transfer section having a concavo-convex pattern composed of a plurality of line-shaped recesses and protrusions adjacent to the unit pixel transfer section and extending along the second axis; and the second unit pixel At least a third unit pixel transfer portion having a concavo-convex pattern composed of a plurality of line-shaped concave portions and convex portions that are adjacent to the transfer portion and extend along the third axis. The axis and the second axis are in a cross relationship, and The second axis and the third axis are in a cross relationship.

The schematic cross-sectional view and plan view of the release sheet of this aspect can be the same as those already described with reference to FIGS. FIG. 5 is an enlarged view showing a part of the unit pixel transfer portion group in the release sheet of this aspect, and corresponds to a Z portion in FIG.
The release sheet 10 of this aspect includes a unit pixel transfer group including at least first to third unit pixel transfer units 11A to 11C on the surface.
Wherein the first unit pixel transfer unit 11A has a first axis _{L A} is composed of a plurality of linear recesses 111a and protrusions 111b extending along the uneven pattern 111A. The second unit pixel transfer unit 11B is adjacent to the first unit pixel transfer unit 11A, and composed of the second axis L plurality of linear recesses 111a and protrusions 111b extending along the _B irregularities It has a pattern 111B. The third unit pixel transfer unit 11C is adjacent to the second unit pixel transfer unit 11B, and is constituted by a third axis L _C plurality of linear recesses 111a and protrusions 111b extending along the uneven It has a pattern 111C.
Further, the first axis L _A and the second axis L _B is the intersection relationship, and, second axis L _B and the third axis L _C of the intersection relations. In FIG. 5, the intersection angle theta ₁ of the first axis _{L A} and the second axis _{L B,} the second axis _{L B} and the third axis _{L C} of the intersection angle theta _2, and the first axis _{L A} and an example intersection angle theta ₃ is 60 °, respectively the third axis L _C. Note that the unit pixel transfer portion may not have regularity in a plan view shape.

The unit pixel transfer portion group in the release sheet of this aspect is formed by arranging a plurality of unit pixel transfer portions. The unit pixel transfer unit group includes at least first to third unit pixel transfer units.
Details of the convex portions and the concave portions constituting the first to third unit pixel transfer portions have been described in the above-mentioned section “1. Release layer”, and thus description thereof is omitted here.

In addition, the planar view shapes of the first to third unit pixel transfer portions can be the same as the planar view shapes of the unit pixel transfer portions described in the above section “1. Release layer”. The unit pixel transfer units arranged in the unit pixel transfer unit group may have regularity in the shape in plan view or may not have regularity.

The planar view shapes of the first unit pixel transfer unit, the second unit pixel transfer unit, and the third unit pixel transfer unit may be congruent to each other, and any two of them are congruent. It does not have to be congruent with each other.
The fact that the planar view shapes of the first to third unit pixel transfer portions are in a congruent relationship means that they have a “congruent” relationship in mathematics (geometry). That is, the first to third unit pixel transfer portions have the same shape (outer peripheral shape) and size in plan view. The uneven pattern in each unit pixel transfer portion may be the same or different for each unit pixel transfer portion.

The planar view shapes of the first unit pixel transfer unit, the second unit pixel transfer unit, and the third unit pixel transfer unit are preferably in a congruent relationship. In the above case, it is preferable that the first unit pixel transfer unit, the second unit pixel transfer unit, and the third unit pixel transfer unit have a rectangular shape in plan view.
FIG. 8 shows an example of unit pixel transfer unit groups in which the first to third unit pixel transfer units have a rectangular shape in plan view and are in the same relationship with each other.

Further, the planar view shapes of the first unit pixel transfer unit, the second unit pixel transfer unit, and the third unit pixel transfer unit do not have to be congruent with each other.
FIG. 5 shows an example of a unit pixel transfer unit group in which the planar view shapes of the first to third unit pixel transfer units are not congruent with each other.

Furthermore, among the first to third types of unit pixel transfer units, any two types of the unit pixel transfer units have the same shape in plan view, and the other one type of unit pixel transfer unit. The planar view shape may be similar to the planar view shape of the two types of unit pixel transfer portions.
For example, in the unit pixel transfer unit group shown in FIG. 9, among the first to third unit pixel transfer units 11A to 11C, the second and third unit pixel transfer units 11B and 11C have a quadrangular shape in plan view. The planar view shape of the first unit pixel transfer portion 11A is similar to the planar view shapes of the second and third unit pixel transfer portions 11B and 11C.

Hereinafter, the case where the planar view shapes of the first to third unit pixel transfer portions are congruent to each other and the case where they are not congruent will be described.

(1) When the shape in plan view is congruent When the shape in plan view of the first to third unit pixel transfer portions is congruent with each other, the first axis and the second axis are in a crossing relationship. In addition, the second axis and the third axis are in a crossing relationship.

(A) Intersection relationship between the first axis and the second axis The angle at which the first axis and the second axis intersect (referred to as the intersection angle between the first axis and the second axis). Of the angles formed by the two directions of the first axis and the second axis, the angle on the acute angle side is indicated. The crossing angle between the first axis and the second axis is not particularly limited.
The intersecting angle between the first axis and the second axis is 90 °, that is, the first axis and the second axis may be orthogonal. Further, the first axis and the second axis may intersect at an angle of 45 °.

(B) Intersection relationship between the second axis and the third axis The angle at which the second axis and the third axis intersect (referred to as the intersection angle between the second axis and the third axis). Of the angles formed by the two directions of the second axis and the third axis, an acute angle angle is indicated.
The intersection angle between the second axis and the third axis is not particularly limited. The intersection angle between the second axis and the third axis may be 90 °, that is, the axis of the second axis and the third axis may be orthogonal.

(C) Crossing relationship between the first, second, and third axes The crossing angle between the first axis and the second axis matches the crossing angle between the second axis and the third axis. May be. Since the planar view shapes of the first to third unit pixel transfer portions are in a congruent relationship with each other, more uniform brightness can be obtained. In addition, since the intersection angle between the first axis and the second axis matches the intersection angle between the second axis and the third axis, clearer brightness can be observed.

At this time, it is preferable that the first axis and the third axis are orthogonal to each other, and the first axis and the second axis intersect at an angle of less than 90 °.

The intersection angle between the first axis and the second axis may be different from the intersection angle between the second axis and the third axis. Since the planar view shapes of the first to third unit pixel transfer portions are in a congruent relationship with each other, more uniform brightness can be obtained. In addition, since the intersection angle between the first axis and the second axis is different from the intersection angle between the second axis and the third axis, the brightness can be observed even if the viewing direction changes. .

Unit pixel transfer section group shown in FIG. 8, the intersection angle of the first axis L _A and the second axis L _B may show different examples and the second axis L _B, and the third crossing angle of the axis L _C of ing. Specifically, the unit pixel transfer section group shown in FIG. 8 has first to fourth unit pixel transfer section 11A-11D, the first axis in the first unit pixel transfer unit 11A L _A and the second crossing angle theta ₁ is 90 ° of the second axis _{L B} of the unit pixel transfer unit 11B, the third axis _{L C} in the second axis _{L B,} and the third unit pixel transfer unit 11C in the second unit pixel transfer unit 11B the crossing angle theta ₂ have the relationship of 45 °. The third crossing angle theta ₃ of the fourth axis _{L D} of the third axis _{L C} and the fourth unit pixel transfer unit 11D in the unit pixel transfer unit 11C is 75 °, the fourth in the fourth unit pixel transfer section 11D crossing angle theta ₄ of axis _{L D} and the first axis _{L a} of the first unit pixel transfer unit 11A is in the relationship of 30 °. Furthermore, the crossing angle theta ₅ of the second shaft L _B in the fourth axis L _D and second unit pixel transfer unit 11B in the fourth unit pixel transfer section 11D have the relationship of 60 °.

Note that each intersection angle may or may not have regularity.

(2) When the shape in plan view is not congruent When the shape in plan view of the first to third unit pixel transfer portions is not congruent with each other, the first axis and the second axis intersect And the second axis and the third axis are in a crossing relationship.

The intersection angle between the first axis and the second axis, and the intersection angle between the second axis and the third axis are the angles described in the above “(1) When the planar view shapes are in a congruent relationship”. It is the same.
Among these, the first axis and the second axis are preferably in an orthogonal relationship.

The intersecting angle between the first axis and the second axis may coincide with the intersecting angle between the second axis and the third axis. Unit pixel transfer unit group 5 shows an example in which the crossing angle of the first axis L _A and the second axis L _B coincides with the second axis L _B, and the third crossing angle of the axis L _C of ing. Although the brightness of the first to third unit pixel transfer portions is not a uniform brightness as in the case where the planar view shapes are in a congruent relationship with each other, the intersection angle between the first axis and the second axis and the second axis Since the intersection angle of the third axis coincides with that of the third axis, the brightness can be observed from a specific direction.

The intersection angle between the first axis and the second axis may be different from the intersection angle between the second axis and the third axis.

(3) Others The unit pixel transfer unit group only needs to include at least the first to third unit pixel transfer units described above, and may include a plurality of unit pixel transfer units.
In addition to the first to third unit pixel transfer units, the unit pixel transfer unit group has an uneven pattern in an axial direction different from the axial direction of the uneven pattern in the first to third unit pixel transfer units. The unit pixel transfer section may be provided.

As described above, the release sheet of this aspect includes a base material and a release layer formed on the base material, and may include a unit pixel group on the surface of the release layer. Moreover, the release sheet of this aspect may be provided with the unit pixel transfer part group on the surface of the single layer with which a release layer and a base material are integrated.

6). Release Sheet Manufacturing Method In the release sheet manufacturing method of the present embodiment, a release layer is formed on a substrate, and a plurality of unit pixel transfer portions having a desired shape are arranged on the surface of the release layer. The method is not particularly limited as long as it is a method capable of forming the unit pixel transfer portion group, and can be appropriately selected according to the material used for forming the release layer.
For example, if the resin contained in the release layer forming composition is an ionizing radiation curable resin, it corresponds to the transfer shape of the unit pixel transfer portion after applying the release layer forming composition to one surface of the substrate. A unit pixel transfer unit group is provided on the surface by pressing a mold plate having a pattern on the surface (hereinafter referred to as a mold plate for forming a release layer) against the coating layer and irradiating it with ionizing radiation. A release layer can be formed.
On the other hand, if the resin contained in the release layer forming composition is a thermoplastic resin, the release layer forming mold plate is formed by extruding and laminating the resin that is the release layer forming composition on the substrate surface. By pressing, a method of forming a release layer having a unit pixel transfer portion group on the surface can be used.
Also, after applying the release layer forming composition to one surface of the substrate, the release layer is provided with a unit pixel transfer part group on the surface by heating and pressing the application layer with a release layer forming mold plate. Can be formed.
Moreover, it is also possible to manufacture a release sheet in which the base material and the release layer are integrated by the above-described method using the release layer forming composition without using the base material.

7). Use The release sheet of this embodiment can be suitably used as a process release paper in the production of resin leather such as synthetic leather and artificial leather.

II. Resin leather A resin leather according to an embodiment of the present invention (hereinafter sometimes referred to as a resin leather of the present embodiment) includes a support layer and a unit pixel group in which a plurality of unit pixels are arranged on the support layer. A resin skin layer provided on the surface, and in the unit pixel, at least five or more line-shaped uneven patterns are periodically arranged in one direction, and in the unit pixel group, Of the two adjacent unit pixels, the longitudinal direction of the concave / convex pattern of one unit pixel and the longitudinal direction of the concave / convex pattern of the other unit pixel are in an intersecting relationship.

The resin leather of this embodiment will be described with reference to the drawings. 10A and 10B are a schematic cross-sectional view and a plan view showing an example of the resin leather of this embodiment. FIG. 11A is an enlarged plan view of a part of the unit pixel group, and corresponds to an enlarged view of a Z portion in FIG. FIG. 11B is a cross-sectional view taken along line XX in FIG. 11A, and is a schematic cross-sectional view of a unit pixel.
The resin leather 20 shown in FIGS. 10 and 11 includes a support layer 21 and a resin skin layer 22 that is formed on the support layer 21 and has a unit pixel group in which a plurality of unit pixels 31 are arranged on the surface.
In the unit pixel 31, at least five or more line-shaped uneven patterns 131 are periodically arranged in one direction. In the concave / convex pattern 131, the concave pattern (concave portion) 131a having a line shape in plan view and the convex pattern (convex portion) 131b having a line shape in plan view are alternately arranged in the same direction. It is arranged and configured.
In the unit pixel group adjacent two unit pixels 31A, among 31B, the longitudinal direction _{L A} concavo-convex pattern 131A of one of the unit pixel 31A, the longitudinal direction _{L B} of the uneven pattern 131B of the other unit pixel 31B is , In a cross relationship.
In FIG. 11B, d _a , d _b , P, T, and H are the width of the concave pattern, the width of the convex pattern, the pitch, the uneven step, and the resin skin layer, respectively, constituting the unit pixel. Indicates the thickness.

According to the resin leather of the present embodiment, on the surface of the resin leather, the unit pixel having a plurality of line-shaped uneven patterns formed at a constant pitch and in a certain direction is the length of the uneven pattern of adjacent unit pixels. By arranging a plurality of directions so as to cross each other, diffracted light and the like are generated in multiple directions for light from the surface light source. A highly glossy and clear color or pattern in which the color is suppressed can be displayed without changing the color of the glossy color. On the other hand, for light from a point light source, each unit pixel disperses the light in a specific direction, thereby displaying a pattern having a glittering feeling due to diffracted light according to the spectral direction regardless of the viewing direction. can do.

Hereinafter, the resin leather of this embodiment is demonstrated for every structure.
In addition, regarding the “line-shaped uneven pattern”, “the line-shaped uneven pattern is periodically arranged in one direction”, and “the longitudinal direction of the uneven pattern” in the resin leather of this embodiment, The contents are the same as those described in the section “A. Release Sheet 1. Release Layer (1) Unit Pixel Transfer Section Group (a) Unit Pixel Transfer Section”.

1. Resin skin layer The resin skin layer in the resin leather of the present embodiment is located on the support layer, and includes a unit pixel group in which a plurality of unit pixels are arranged on the surface.
The resin skin layer has a texture and color similar to natural leather as the skin of the resin leather.

The unit pixel and unit pixel group in the resin skin layer are the same as the unit pixel transfer unit and unit pixel transfer unit group included in the release layer described in the section “A. Release Sheet 1. Release Layer”. Explanation here is omitted. The unit pixel in the resin skin layer corresponds to the inverted shape of the unit pixel transfer portion provided in the release layer.

Within the unit pixel group, the longitudinal direction of the concave / convex pattern of one unit pixel and the longitudinal direction of the concave / convex pattern of the other unit pixel of the two adjacent unit pixels may be orthogonal to each other. preferable. The reason is the same as the reason described in the section “A. Release sheet 1. Release layer”.

Further, it is preferable that the unit pixel has a rectangular shape in plan view and a side length of 15 μm or more and 300 μm or less. The reason is the same as the reason for the length of one side of the unit pixel transfer portion described in the section of “A. Release sheet 1. Release layer”.

The concavo-convex pattern of the unit pixel has a convex pattern and a concave pattern, and is the sum of the width of the adjacent convex pattern and the width of the concave pattern, that is, the width of one convex pattern and the one convex pattern. It is preferable that the sum with the width of the concave pattern adjacent to is 3 μm or more and 60 μm or less. The reason is the same as the reason described in the section “A. Release sheet 1. Release layer”.

The uneven pattern of the unit pixel has a convex pattern and a concave pattern, and the width of the convex pattern may be different from the width of the concave pattern. The reason is the same as the reason described in the section “A. Release sheet 1. Release layer”.

As the resin used for the resin skin layer, resins generally used for the production of synthetic leather and artificial leather can be applied, and examples thereof include nylon resin, polyurethane resin, and polyvinyl chloride resin. Especially, it is preferable that the said resin skin layer contains at least 1 sort (s) selected from the group which consists of a nylon resin, a polyurethane resin, and a polyvinyl chloride resin.
The resin skin layer may contain additives such as a plasticizer, a stabilizer, and a colorant.

The thickness of the resin skin layer is not particularly limited as long as it is a thickness capable of providing a unit pixel having a desired shape and a unit pixel group that is an aggregate of the unit pixel, and can be appropriately designed depending on the application. it can.

2. Support layer The support layer in the resin leather of this embodiment supports a resin skin layer.
As the support layer, natural fibers such as cotton, hemp and wool, regenerated or semi-synthetic fibers such as rayon and acetate, woven fabrics and nonwoven fabrics made of synthetic fibers such as polyamide, polyester, polyacrylonitrile, polyvinyl alcohol and polyolefin, From a support layer generally used for synthetic leather or artificial leather, such as a net cloth, paper, a resin film such as polyester or polyolefin, a metal plate, a glass plate, etc., it can be appropriately selected according to the type and use of the resin leather.
The thickness of the support layer is not particularly limited as long as it can support the resin skin layer.

3. Other aspects Other aspects of the resin leather of the present embodiment include a support layer and a resin skin layer provided on the surface with a unit pixel group in which a plurality of unit pixels are arranged on the support layer. The unit pixel group is adjacent to the first unit pixel, the first unit pixel having a concavo-convex pattern composed of a plurality of line-shaped concave and convex portions extending along a first axis, and A second unit pixel having a concavo-convex pattern composed of a plurality of line-shaped concave portions and convex portions extending along the second axis, and adjacent to the second unit pixel and along the third axis At least a third unit pixel having a concavo-convex pattern composed of a plurality of line-shaped recesses and projections extending in a line, wherein the first axis and the second axis are in an intersecting relationship, and the first The two axes and the third axis are in a cross relationship.

The resin leather having this aspect can be manufactured using the release sheet described in the above section “A. Release sheet, 5. Other aspects”. The details of the first to third unit pixels in the resin leather having the above-described aspect are as follows. The first to third unit pixels in the release sheet described in the section “A. Release sheet 5. Other aspects” above. The details of the transfer portion can be the same.

4). Method for Producing Resin Leather As a method for producing resin leather of the present embodiment, a release pixel described in the above section “A. Release Sheet” is used, and a unit pixel having a desired shape is formed on the surface of the resin skin layer of the resin leather. The method is not particularly limited as long as it is a method capable of forming a unit pixel group that is an aggregate thereof, and a conventionally known method for producing synthetic leather or artificial leather using a release sheet can be used. The method for producing the resin leather may be a dry method or a wet method.
For example, in the case of producing resin leather by a dry method, the resin skin layer forming composition is applied to the surface of the release layer of the release sheet described in the above section “A. Release sheet” and dried. A resin leather can be produced by forming a layer, laminating a support layer on the resin skin layer via an adhesive layer, drying and aging, and then releasing the release sheet. As the adhesive layer, a conventionally known adhesive layer used for the production of resin leather can be used.

The composition for forming the resin skin layer is not particularly limited as long as a desired resin skin layer can be formed, and is appropriately selected depending on the type of the resin leather.
For example, when the resin leather is polyurethane leather, a polyurethane paste or the like containing polyurethane and optional additives and having a solid content of about 20% by weight to 50% by weight is used as the resin skin layer forming composition. When the resin leather is polyvinyl chloride leather, a sol or the like containing polyvinyl chloride and optional additives is used as the resin skin layer forming composition.
As a coating method of the resin skin layer forming composition, a known method can be used depending on the composition of the resin skin layer forming composition.

5. Application The resin leather of this embodiment can be used for applications in which synthetic leather is generally used. It can also be used as a substitute for natural leather. Specific applications include clothing materials, bags, shoes, wallets, smartphone cover skin materials, interior materials, instrument panel materials, car seat skin materials, steering wheel skin materials, and motorcycle seat materials. Etc. FIGS. 12A and 12B are schematic views showing examples of the bag 50 and the instrument panel material 60 using the resin leather of this embodiment, respectively.

The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

Hereinafter, the present invention will be described in more detail with reference to examples.

[Examples 1 to 15]
1. Preparation of transfer master plate After forming a partition region having a line-shaped uneven pattern shown in Tables 1 to 3 on the surface of a cylinder (diameter: 100 mmφ, width 300 mm) plated with a gravure printing plate, the surface is subjected to chromium plating treatment. did. The cylinder was attached to a roll embossing device. The partition area in the transfer material is a part where the unit pixel transfer portion of the release sheet is transferred and formed. The convex pattern and the concave pattern have the same width.

2. Production of release sheet Polypropylene is applied on one surface of a paper substrate (thickness 150 μm) to form a release layer with a thickness of 30 μm, and the cylinder is placed on the release layer under the following conditions. A unit pixel transfer portion group, which is an aggregate of unit pixel transfer portions in which a plurality of line-like uneven patterns are formed on the surface of the release layer, is formed by transferring the uneven pattern of the partition area by heating and pressing. A long release sheet (raw width 300 mm) was obtained. Tables 1 to 3 show details of the unit pixel transfer portion in the release sheet. The number of patterns is the total number of concave patterns and convex patterns, and each pattern is half the number of patterns. For example, if the number of patterns is 10, there are 5 convex patterns and 5 concave patterns. Also, FIG. 13A shows the arrangement mode of the unit pixel transfer portions in the release sheets of Examples 1 to 5, and FIG. 13B shows the arrangement mode of the unit pixel transfer portions in the release sheets of Examples 6 to 10. FIG. 13C shows an arrangement mode of the unit pixel transfer portions in the release sheets of Examples 11 to 15. Arrows L in FIGS. 13A to 13C indicate the longitudinal direction (axial direction) of the concavo-convex pattern of each unit pixel transfer portion.
(Transfer conditions)
・ Cylinder temperature: 120 ℃
・ Pressing force: 150 kgf / cm
・ Conveying speed: 5m / min

3. Production of Resin Leather (Synthetic Leather) Synthetic leather having the following composition as a resin skin layer forming composition on the release layer of each release sheet using each release sheet obtained in Examples 1 to 15. The polyurethane composition for the skin layer was applied by a bar coating method and dried by heating in the range of 100 ° C. to 120 ° C. for 2 minutes. Thereafter, a base fabric (support layer) was bonded onto the coating layer using an adhesive, and after drying and aging, the release sheet was peeled off to obtain a synthetic leather. Synthetic leather has a unit pixel consisting of a plurality of line-shaped uneven patterns on the surface and a unit pixel group that is an aggregate thereof, and the uneven pattern on the synthetic leather has the same dimensions as the uneven pattern of the release sheet. Had a shape.
(Resin skin layer forming composition)
・ Polyurethane (Resamine NE-8811, manufactured by Dainichi Seika Kogyo Co., Ltd.) ... 100 parts by weight Colorant (Seika Seven NET-5794 Black, manufactured by Dainichi Seika Kogyo Co., Ltd.): 15 parts by weight Isopropyl alcohol (IPA): 25 parts by weight

4). Evaluation The following evaluations were performed on the release sheets obtained in Examples 1 to 15 and the synthetic leather produced using the release sheets. The evaluation results are shown in Tables 1 to 3.

(1) Transfer rate measurement Using a laser microscope, the depth of the concavo-convex pattern formed on the surface of each obtained transfer original plate and the concavo-convex pattern formed on the release layer surface of the release sheet formed by the transfer original plate Measured.
As the measurement location, first, one of the partitioned areas on the surface of the transfer original plate was selected, and the height of any five lines in the partitioned area was measured to obtain the average value. Next, on the surface of the release layer of the release sheet obtained from the transfer original plate, in the unit pixel transfer portion formed by the partition area, the uneven line corresponding to any five lines in the partition area The height was measured and the average value was obtained. The depth of the concavo-convex pattern formed in the unit pixel transfer portion on the surface of the release layer relative to the depth of the concavo-convex pattern formed in the partition region of the transfer original plate was calculated and defined as the transfer rate.

In the release sheets of Examples 6 to 10, the longitudinal angle of the concavo-convex pattern is 90 °, and the longitudinal direction of the concavo-convex pattern of the unit pixel transfer portion is oblique (+ 45 °) with respect to the longitudinal direction of the release sheet. ) × oblique (−45 °), the transfer rate could be improved as compared with the other examples.

(2) Pattern shape by diffracted light generated by light from a point light source For each synthetic leather, a 100 mm square sample is cut out, placed on a desk, irradiated with light from a point light source at an incident angle of 30 °, and reflected. The shape of the pattern by diffracted light visually recognized at an angle of 30 ° and an upper position of 500 mm was specified.

For the synthetic leather formed using the release sheets obtained in Examples 1 to 10 and 11 to 15, when comparing the shape of the pattern by the diffracted light generated by the light from the point light source, the uneven pattern in the unit pixel group was compared. By increasing the longitudinal direction from 2 directions to 4 directions, the displayed pattern changes from a cross shape to a shape consisting of eight radiations, and the way of shine is changed from 4 directions (FIG. 14 (a)) to 8 directions (FIG. 14 ( b)).

(3) Appearance evaluation Each synthetic leather was visually inspected according to the following procedure to determine whether the unit pixel can be visually recognized.
(procedure)
A 100 mm square sample was cut out from the synthetic leather, the sample was placed on a desk, and the unit pixel was observed from a position 500 mm above. The test environment was an illuminance of 400 lux (equivalent to a bright office).
10 subjects (from 20s to 60s) were counted, and the number of persons who could visually recognize the shape of the unit pixel was counted, and the following determination was made.
◎◎: 0 people (unit pixel is not visible at all)
◎: 1 to 2 people (unit pixels are almost invisible)
○: 3 to 7 people (unit pixels are slightly visible)
△: 8 or more (unit pixel is visible)

Synthetic leather formed using the release sheets obtained in Examples 1 to 15 was able to obtain a desired glossiness without a change in glossy color with respect to a surface light source. Further, the synthetic leather formed using the release sheets obtained in Examples 1 to 4, Examples 6 to 9, and Examples 11 to 14 is a planar view shape (pixel size) of the unit pixel transfer portion of the release sheet. ) Of 300 μm × 300 μm or less, it was possible to make it difficult to visually recognize the unit pixel.

DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Release layer 10 ... Release sheet 11 ... Unit pixel transfer part 111 ... Uneven pattern 20 ... Resin leather 21 ... Support layer 22 ... Resin skin layer 31 ... Unit pixel 131 ... Uneven pattern

Claims (20)

1. A substrate;
   A release layer provided on the surface with a unit pixel transfer unit group located on the substrate and having a plurality of unit pixel transfer units disposed thereon,
   Have
   In the unit pixel transfer portion, at least five or more line-shaped uneven patterns are periodically arranged in one direction,
   In the unit pixel transfer portion group, of the two adjacent unit pixel transfer portions, the longitudinal direction of the concave / convex pattern of one unit pixel transfer portion and the longitudinal direction of the concave / convex pattern of the other unit pixel transfer portion But there is a release sheet in the cross relationship.
2. In the unit pixel transfer portion group, of the two adjacent unit pixel transfer portions, the longitudinal direction of the concave / convex pattern of one unit pixel transfer portion and the longitudinal direction of the concave / convex pattern of the other unit pixel transfer portion The release sheet according to claim 1, which has an orthogonal relationship.
3. The release sheet has a long shape, and in the unit pixel transfer part group, the longitudinal direction of the concave / convex pattern of one unit pixel transfer part and the other of the two adjacent unit pixel transfer parts The release sheet according to claim 2, wherein the direction of the uneven pattern of the unit pixel transfer portion is inclined by 45 ° with respect to the longitudinal direction of the release sheet.
4. 2. The release sheet according to claim 1, wherein the unit pixel transfer portion has a rectangular shape in plan view and a side length of 15 μm or more and 300 μm or less.
5. The concavo-convex pattern of the unit pixel transfer part has a convex pattern and a concave pattern, and the sum of the width of the adjacent convex pattern and the width of the concave pattern is 3 μm or more and 60 μm or less. Release sheet.
6. A release sheet provided on the surface with a unit pixel transfer part group in which a plurality of unit pixel transfer parts are arranged,
   The unit pixel transfer group includes a first unit pixel transfer portion having a concavo-convex pattern composed of a plurality of line-shaped concave portions and convex portions extending along a first axis;
   A second unit pixel transfer unit having a concavo-convex pattern composed of a plurality of line-shaped recesses and projections adjacent to the first unit pixel transfer unit and extending along the second axis;
   A third unit pixel transfer unit having a concavo-convex pattern composed of a plurality of line-shaped recesses and projections adjacent to the second unit pixel transfer unit and extending along a third axis;
   Comprising at least
   The release sheet in which the first axis and the second axis are in a crossing relationship, and the second axis and the third axis are in a crossing relationship.
7. The release sheet according to claim 6, wherein an angle at which the first axis and the second axis intersect with each other matches an angle at which the second axis and the third axis intersect.
8. 8. The release sheet according to claim 7, wherein the first unit pixel transfer part, the second unit pixel transfer part, and the third unit pixel transfer part have a congruent relationship in plan view.
9. The release sheet according to claim 8, wherein the first unit pixel transfer unit, the second unit pixel transfer unit, and the third unit pixel transfer unit have a rectangular shape in plan view.
10. The release sheet according to claim 8, wherein the first axis and the second axis are orthogonal to each other.
11. The first axis and the third axis are in an orthogonal relationship, and the first axis and the second axis are in a relationship of intersecting at an angle of less than 90 °. Release sheet.
12. The release sheet according to claim 8, wherein the first axis and the second axis intersect at an angle of 45 °.
13. The release sheet according to claim 7, wherein the first unit pixel transfer unit, the second unit pixel transfer unit, and the third unit pixel transfer unit have a shape in plan view that is not congruent with each other.
14. The release sheet according to claim 13, wherein the first axis and the second axis are orthogonal to each other.
15. The planar view shapes of the first unit pixel transfer unit, the second unit pixel transfer unit, and the third unit pixel transfer unit have a congruent relationship with each other,
    The release sheet according to claim 6, wherein an angle at which the first axis and the second axis intersect is different from an angle at which the second axis and the third axis intersect.
16. A support layer;
    A resin skin layer provided on the surface with a unit pixel group in which a plurality of unit pixels are arranged on the support layer;
    Have
    Within the unit pixel, at least five or more line-shaped uneven patterns are periodically arranged in one direction,
    Within the unit pixel group, the resin leather in which the longitudinal direction of the concave / convex pattern of one of the unit pixels and the longitudinal direction of the concave / convex pattern of the other unit pixel of the two adjacent unit pixels intersect each other. .
17. In the unit pixel group, the longitudinal direction of the concave / convex pattern of one of the unit pixels and the longitudinal direction of the concave / convex pattern of the other unit pixel in the two adjacent unit pixels are orthogonal to each other. 16. Resin leather according to 16.
18. The resin leather according to claim 16, wherein the unit pixel has a rectangular shape in plan view and a side length of 15 µm or more and 300 µm or less.
19. The concavo-convex pattern of the unit pixel has a convex pattern and a concave pattern,
    The resin leather according to claim 16, wherein the sum of the width of the adjacent convex pattern and the width of the concave pattern is 3 µm or more and 60 µm or less.
20. The resin leather according to claim 16, wherein the resin skin layer includes at least one selected from the group consisting of a nylon resin, a polyurethane resin, and a polyvinyl chloride resin.

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