TWI624576B - Mold releasing sheet and resin leather - Google Patents

Abstract

The release sheet provided by the present invention includes a base material and a release layer; the release layer is provided on the base material, and a lens portion composed of a plurality of unit lenses with curved surfaces is provided on the surface.

Description

Release sheet and resin leather

This disclosure relates to release sheets and resin leather. In particular, it relates to a release sheet capable of easily producing a high-gloss feeling with suppressed gloss, and exhibiting design leather with a change in gloss in the observation area, and the above-mentioned resin leather exhibiting design.

Resin leather, such as synthetic leather, is applied to a release sheet having a peelable surface, and after the resin composition as a raw material is applied and hardened, it can be manufactured by peeling off the release sheet, using a skin formed from the resin composition The layer has a texture and color similar to natural leather.

In recent years, optical design is required for resin leather. In order to manufacture such resin leather, various methods have been studied for release sheets. For example, in Patent Documents 1 and 2, it is proposed to provide a full-image fine irregularity-shaped release sheet on the surface, and the synthetic leather manufactured using such a release sheet can be made using the full-image fine unevenness imparted to the skin layer. With the observation angle, it shows iridescent luster.

In addition, in this specification, the "resin leather" refers to leather made of resin that simulates natural leather, and is referred to as synthetic leather and artificial leather.

[Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 4-361671

[Patent Document 2] Japanese Patent Laid-Open No. 2010-253779

The technologies disclosed in Patent Documents 1 and 2 aim to improve the designability of resin leather by using the change of gloss color, but on the other hand, it is required not to rely on the change of gloss color but to use the change in gloss level corresponding to the observation area (Change in gloss) The design of resin leather, specifically, within a certain viewing angle range (as an observation area), can be seen to show the original color of the resin leather and have a high gloss, but in other observations The design resin leather of this kind of gloss will not be seen in the area. In addition, if the gloss is to be improved, the surface will have a dazzling oil shine due to the amount of strong light, resulting in a glossiness different from the original gloss of resin leather. Therefore, the design of resin leather also requires a high gloss feeling to suppress oil shine, and it is expected that a release sheet having such design resin leather can be manufactured.

The present invention has been completed in view of the above-mentioned facts, and its main object is to provide a release sheet that can easily produce a high-gloss feeling with suppressed gloss, and can exhibit a design-made resin leather that utilizes the change in gloss in conjunction with the observation area, and It exhibits a high-gloss feel with suppressed shine, and the observation area shows the design of resin leather that uses the change in gloss to produce design.

In order to realize the resin leather with the above design, the inventors intensively researched and found that by using a release sheet provided with a curved unit lens on a plurality of surfaces, the surface of the obtained resin leather is shaped as a use unit The complex unit lens shape of the lens reversal shape can adjust the scattering intensity distribution of the specular reflection component and diffuse reflection component of the reflected light generated on the surface of the resin leather (hereinafter also referred to as "scattered distribution of reflected light"). Then, it was found that by adjusting the scattering distribution of the reflected light, the resin leather can produce a change in glossiness in accordance with the observation area, and can exhibit a high glossiness with suppressed gloss. The present invention was completed on the basis of this discovery.

That is, the release sheet provided in one embodiment of the present invention includes a base material and a release layer; the release layer is provided on the base material and has a plurality of unit lenses with curved surfaces arranged on the surface Lens section.

The release sheet provided in one embodiment of the present invention is provided with a plurality of lens units with curved unit lenses on the surface, and the radius of curvature of the unit lens is 15 μm or more and 150 μm or less.

The resin leather provided in one embodiment of the present invention includes: a support layer and a resin skin layer; the resin skin layer is provided on the support layer, and the surface is provided with a plurality of unit lens shapes with curved surfaces. Lens shape part.

The resin leather provided in one embodiment of the present invention is provided with a lens-shaped portion composed of a plurality of unit lens shapes with curved surfaces arranged on the surface, and the unit lens shape The radius of curvature is 15 μm or more and 150 μm or less.

The release sheet according to an embodiment of the present invention achieves the effect of easily producing a high-gloss feeling with suppressed gloss, and in combination with the observation area, the effect of designing resin leather produced by the change in gloss feeling can be exhibited.

Furthermore, the resin leather according to an embodiment of the present invention can achieve a high gloss feeling with suppressed gloss due to the shape of a plurality of unit lenses provided on the surface, and it can show the design resulting from the change in gloss feeling in conjunction with the observation area Sexual effect.

1‧‧‧ Base material

2‧‧‧ Release layer

3‧‧‧Lens Department

3a, 3b‧‧‧ unit lens

5‧‧‧single layer

10‧‧‧ release film

11‧‧‧support layer

12‧‧‧Resin skin layer

13‧‧‧Lens shape section

13a‧‧‧Unit lens shape

20‧‧‧Resin leather

50‧‧‧ leather bag

60‧‧‧Instrument sheet

C‧‧‧Root part of unit lens

D‧‧‧ unit lens thickness

P‧‧‧Unit lens arrangement pitch

T‧‧‧thickness of release layer

W‧‧‧Unit lens width

X‧‧‧cutting line

1 (a) and (b) are schematic perspective schematic views and cross-sectional views of an example of a release sheet according to an embodiment of the present invention.

2 (a) and (b) are schematic perspective schematic views and cross-sectional views of another example of a release sheet according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram illustrating the scattered light intensity distribution caused by the shape of the reflecting surface.

4(a) to (c) are explanatory diagrams illustrating the definition of the diffusion angle.

5(a) and (b) are explanatory diagrams illustrating the cross-sectional shape of the unit lens.

6 (a) and (b) are schematic perspective schematic views and cross-sectional views of another example of a release sheet according to an embodiment of the present invention.

7 is an explanatory diagram illustrating the difference between the scattering angle at the scattered light intensity of 20% and the scattering angle at the scattered light intensity of 80% in the scattered light intensity distribution curve.

8(a) and (b) are schematic cross-sectional views of another example of a release sheet according to an embodiment of the present invention.

9(a) and (b) are schematic perspective schematic views and cross-sectional views of an example of resin leather according to an embodiment of the present invention.

10(a) and (b) are schematic perspective schematic views and cross-sectional views of another example of resin leather according to an embodiment of the present invention.

11(a) to (d) are schematic views of examples of use of resin leather according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to drawings and the like. However, the present invention can be implemented in many different forms, and should not be interpreted as being limited to the description of the embodiments exemplified below. In addition, the diagram is to be more clear. Compared with the actual situation, the width, thickness, shape and other relevant parts of the relevant parts will be designed to represent the situation. At best, it is only one example, not limiting the interpretation of the present invention. . In this specification and the drawings, the same elements as those described in the previous figures are given the same elements, and detailed descriptions are omitted as appropriate. In addition, for the convenience of explanation, there may be cases where the terms "above" or "below" are used for explanation, but the up and down directions may also be reversed.

In addition, the following exemplifies the case of specific numerical values, which can be understood as including the errors caused by manufacturing, etc., to the extent that they do not excessively impair the effects achieved by the present embodiment. In addition, related expressions indicating the degree of "vertical" can also be understood to cover errors caused by manufacturing, etc., to the extent that they do not excessively impair the effects achieved by this embodiment.

A. Release film

The release sheet of one embodiment of the present invention (hereinafter also referred to as the "release sheet of this embodiment") is provided with a base material and a release layer. The release layer is provided on the above substrate, Moreover, the surface is provided with a lens part composed of a plurality of unit lenses with curved surfaces.

The release sheet of this embodiment will be described with reference to the drawings. FIGS. 1(a) and 2(a) are schematic perspective schematic views of an example and another example of a release sheet according to this embodiment, and FIGS. 1(b) and 2(b) are diagrams of FIG. 1(a) and FIG. 2 (a) XX line sectional view. The release sheet 10 is provided with a base material 1 and a release layer 2. The release layer 2 is provided on the substrate 1 and has a lens portion 3 composed of a plurality of unit lenses 3a with curved surfaces arranged on the surface.

FIG. 1 shows an example of a convex curved shape in which the unit lens 3 a protrudes from the surface of the release layer 2. FIG. 2 shows an example of a concave curved surface shape in which the unit lens 3a is recessed into the surface of the release layer 2. In FIGS. 1 and 2, the lens portion 3 has a microlens array shape.

According to the release sheet of this embodiment, since the surface of the release layer is provided with a lens portion composed of a complex arrangement of unit lenses with curved surfaces, it is possible to easily manufacture a lens provided with a complex configuration of the desired unit lens shape on the surface Resin leather in the shape part. Then, the resin leather obtained by the release sheet of this embodiment can adjust the scattering distribution of the reflected light generated on the surface of the resin leather by providing the lens-shaped portion described above, and can exhibit a high-gloss feeling with suppressed gloss, and can be combined The observation area can show the design produced by the change of gloss.

Here, the reason why the release sheet according to the present embodiment has the above-mentioned structure and the obtained resin leather can express the above-mentioned designability will be described below.

When the resin leather comes into contact with light, the surface of the resin leather generates light components (specular reflection components) that reflect at the same angle as the incident angle, and light components that reflect in a random direction and diffuse widely (diffuse reflection components).

In order to improve the glossiness of resin leather, it is generally adopted to make the surface smooth and increase the proportion of the specular reflection component. However, if this method is adopted, because the specular reflection component in the reflected light generated on the surface of the resin leather will directly enter the observer's eyes, the resin leather will also produce oil shine due to the intense light of the surface, causing it to appear different Resin leather has a lustrous luster. In addition, at this time, the direction in which the specular reflection is caused is limited to a narrow angle area, so the observation area where the resin leather can check the glossiness is also limited.

On the other hand, if the surface of the resin leather is subjected to surface treatment by relief processing, sand blasting, plating, etc. to give random fine irregularities, the proportion of diffuse reflection components in the reflected light generated on the surface of the resin leather will increase, so Can inhibit the occurrence of shine. At this time, since the diffuse reflection system is generated in a wide range, the observation area where the glossiness of the resin leather can be inspected is wider than when it is smooth.

However, if the proportion of the diffuse reflection component is increased, the gloss will be reduced, and the resin leather will appear off-white when inspected due to the mixture of the diffuse reflection component and the specular reflection component.

This difference in gloss and the width of the high-gloss area can be inspected, presumably due to the anisotropy of the scattered light intensity of the light incident on the resin leather from the desired angle and the size of the diffusion angle.

Here, the anisotropy of the scattered light intensity can be explained according to the scattered light intensity distribution to the degree of the slope of the scattering angle. In addition, the diffusion angle system can define the scattering angle from the scattered light intensity distribution. The diffusion angle system is shown in FIG. 3, and the scattered light intensity L becomes the maximum scattering in the scattered light intensity distribution curves Px and Py with the scattering angle (θ) as the X axis and the scattered light intensity (L) as the Y axis. The half-value width of the difference (θ ₂ -θ ₁ ) between the two scattering angles θ ₁ ( _Px ), θ _1(Py) and θ _2(Px) and θ _{2(Py) which} is half of the light intensity L _max Defined by FWHM(Px) and FWHM(Py). For example, if the scattering angle (θ) that is one-half of the maximum scattered light intensity L _max is in the range of θ ₁ =-10° to θ ₂ =+10°, the diffusion angle becomes 20°. In addition, the measurement method of the related scattered light intensity will be described in detail later.

Since the reflected light generated by the smooth surface is mostly a specular reflection component, as shown in FIG. 4(a), the scattered light intensity distribution curve P has a sharp slope, and the anisotropy of the scattered light intensity is small. In addition, at this time, since the range of the scattering angle θ which is one-half of the maximum scattered light intensity L _max is small, the calculated diffusion angle FWHM also becomes small. On the other hand, since the reflected light generated from the random fine uneven surface is mostly diffuse reflection component, as shown in FIG. 4(b), the slope of the scattered light intensity distribution curve P is smooth, and the scattered light intensity is not The isotropy is greater. In addition, at this time, since the range of the scattering angle θ which is half of the maximum scattered light intensity L _max is large, the calculated diffusion angle FWHM also becomes large.

That is, the steeper the slope of the scattered light intensity distribution curve, the smaller the anisotropy of the scattered light intensity, and the higher the glossiness of the resin leather. On the other hand, the wider the range of the diffusion angle, the wider the observation area where the glossiness of the resin leather can be inspected.

The resin leather obtained by using the release sheet of the present embodiment, by transferring the unit lens provided with a plurality of curved surfaces on the surface of the release sheet and the lens portion of its assembly, the surface is provided with a plurality of curved surfaces The unit lens shape and the lens shape portion of its assembly. Then, the reflected light generated by the lens-shaped portion of the resin leather can exhibit a scattering distribution having both the optical characteristics caused by the smooth surface and the optical characteristics caused by the fine uneven surface.

That is, the reflected light generated in the lens shape portion is as shown in FIG. 4(c). Although the scattered light intensity distribution curve P has a sharp slope, the anisotropy of the scattered light intensity is small, but because it becomes the maximum scattered light The range of the scattering angle θ of the half of the intensity L _max is large, so the calculated diffusion angle FWHM becomes large.

Therefore, the resin leather obtained from the release sheet of this embodiment has a wide viewing area where the glossiness can be inspected. In addition, the resin leather system can exhibit a high gloss feeling in which the gloss is suppressed when the observation area is within the diffusion angle range; on the other hand, if the observation area deviates from the diffusion angle range, the gloss feeling may be sharply reduced.

According to this, the resin leather obtained from the release sheet of this embodiment adjusts the scattering distribution of the reflected light by the lens shape portion on the surface, so that it exhibits a lustrous sense of suppression of the oily gloss, and the change of the luster feel can appear in conjunction with the observation area The resulting design.

The release sheet of this embodiment can be obtained by designing: the curved surface shape of a plurality of unit lenses provided on the surface of the release layer, the arrangement of the unit lens, and the lens portion of its assembly, to obtain resin leather Present the desired scattering distribution.

In addition, the scattering distribution exhibited by the resin leather obtained by using the release sheet of this embodiment will be described later in the section "B. Resin leather".

In this specification, the scattered light intensity and the scattered light intensity distribution curve can be measured and plotted according to the following method. The intensity of the scattered light is a three-dimensional variable-angle spectrophotometric color measurement system (GCMS-13 type, manufactured by Murakami Color Technology Research Institute Co., Ltd.), and the incident light is incident on the object surface at an incident angle of 0° (that is, in the vertical direction). The scattered light intensity was measured for each scattering angle within the range of 60° to 60° and at variable angle intervals of 1°. Then, by setting the scattering angle to the X axis and the scattered light intensity to the Y axis, the When the value of the scattering angle is traced, the scattered light intensity distribution curve can be drawn.

The diffusion angle can be obtained from the obtained scattered light intensity distribution curve by calculating the half-value width of the difference of the scattering angle that the scattered light intensity becomes one-half of the maximum scattered light intensity.

In the release sheet of this embodiment, when a plurality of unit lenses constituting the lens portion have a convex shape to the surface of the release layer (ie, as shown in FIG. 1, from the surface of the release layer toward the base material side The back side of the case has a convex convex shape), and the obtained resin leather has a unit lens shape having a concave shape recessed toward the inside with respect to the surface. On the other hand, when the plural unit lens constituting the lens portion has a concave shape with respect to the surface of the release layer (ie, as shown in FIG. 2, a concave shape is formed from the surface of the release layer toward the substrate side) The resin leather obtained has a convex unit lens shape with a protruding surface.

The unit lens of the release sheet of this embodiment is not only concave or convex, but the concave and convex orientation and focal position of the unit lens shape of the obtained resin leather (that is, the focus of each unit lens shape) is only located inside or outside the resin leather The difference is that in any case, the curved surface of the unit lens shape can be used to adjust the scattering distribution of the reflected light according to the above principle. The obtained resin leather can show a high gloss feeling with suppressed oil shine, and a gloss feeling in conjunction with the observation area. Variety.

Hereinafter, each configuration of the release sheet according to this embodiment will be described.

1. Release layer

The release layer system of the release sheet of this embodiment is formed (arranged) on the above-mentioned substrate, and the surface The surface is provided with a lens portion composed of a plurality of unit lens arrangements with curved surfaces.

In the following, the surface on which the lens portion is provided is also referred to as the “surface of the lens portion (of the release layer)” on the surface of the release layer.

(1) Lens section

The lens portion of the release layer is composed of a complex arrangement of unit lenses with curved surfaces.

The unit lens system may have a curved surface, and may have a convex shape or a concave shape with respect to the lens portion forming surface of the release layer. When the unit lens has a convex shape with respect to the lens portion forming surface of the release layer, the focal point of the unit lens is located inside the release layer or the substrate. On the other hand, when the unit lens has a concave shape with respect to the lens portion forming surface of the release layer, the focal point of the unit lens is located outside the release layer on the side of the release layer.

Especially in this embodiment, the unit lens preferably has a convex shape with respect to the surface of the release layer. That is, the focal point of the unit lens is preferably located inside the release layer or the substrate. The unit lens has a convex shape protruding outward from the surface of the release layer, and the resin leather manufactured by the release sheet of this embodiment can form a unit lens shape with a concave shape on the surface. Therefore, the obtained resin leather can not only show the required design using the lens shape part molded on the surface, but also can reduce the amount of material compared with the case where the lens shape is formed into a convex shape unit lens To.

The unit lens system may be a spherical lens or an aspheric lens. Specific examples of such unit lenses are: microlenses, cylindrical lenses, Fresnel lenses, toric lenses Mirror (toric lens) and so on.

The planar shape of the unit lens is not particularly limited, and can be appropriately designed according to the type of unit lens. For example: quadrilateral, polygon, triangle, etc., such as circle, rectangle or square.

In addition, the cross-sectional shape in the thickness direction of the unit lens (hereinafter referred to as "cross-sectional shape") is illustrated in FIG. 5(a), and may be symmetrical with respect to the central axis Y of the unit lens 3a, as shown in FIG. 5(b ), the center axis Y of the unit lens 3a is asymmetrical, and can be appropriately designed in accordance with the design requirements for the resin leather obtained by using the release sheet of this embodiment.

For example, if all the cross-sectional shapes of the plurality of unit lenses are symmetrical, then in the obtained resin leather, the scattering distribution of the reflected light exhibited by each unit lens shape also has symmetry. That is, in the obtained resin leather, since the scattering distribution of the reflected light generated by the lens shape portion becomes symmetrical, when viewed from two directions having a symmetric relationship with respect to the central axis of the unit lens shape, the same glossiness will be exhibited.

On the other hand, if the cross-sectional shape of a plurality of unit lenses has an asymmetric shape, in the obtained resin leather, the scattering distribution of the reflected light exhibited by each unit lens shape can also be asymmetric. That is, in the obtained resin leather, since the scattering distribution of the reflected light generated by the lens shape portion becomes asymmetric, when viewed from two directions having a symmetric relationship with respect to the central axis of the unit lens shape, one of the directions has a high gloss feeling, The opposite direction shows a low gloss, which can make the design different.

In addition, the "cross-sectional shape of the unit lens" refers to the shape of the unit lens viewed from the width direction; and the "center axis of the unit lens" refers to the axis passing through the center of the width of the unit lens (O in FIG. 5). The central axis of the lens shape of the related resin leather is also the same, referring to the axis passing through the center of the lens shape width.

The width of the unit lens can be adjusted as long as the surface of the resin leather obtained by using the release sheet of this embodiment can adjust the size of the scattering distribution of the reflected light. For example, it is preferably 300 μm or less, more preferably 100 μm or less, and the ultra good series. Below 80μm. In addition, the width is preferably 30 μm or more. If the width of the unit lens is larger than the above range, the shape of the unit lens on the surface of the resin leather obtained by using the release sheet of this embodiment is easy to see, which may impair the designability of the resin leather. On the other hand, if the width of the unit lens is smaller than the above range, although the function of the unit lens and the unit lens shape of the surface of the resin leather formed by the unit lens hardly change, the manufacturing difficulty may be increased.

The “unit lens width” is illustrated in FIGS. 1(b) and 2(b), and refers to the width W of the root portion of the unit lens. For example, in the case of a micro lens, when the shape of the unit lens is circular, the width of the unit lens refers to the diameter of the circle. Also, like a cylindrical lens, when the unit lens has a rectangular shape in plan view, the width of the unit lens refers to the length of the unit lens in the short side direction.

The so-called "root part of unit lens" refers to the part where the contour of one unit lens is switched to the contour of another unit lens when adjacent unit lenses are not spaced apart; when adjacent unit lenses are spaced apart , Refers to the part that switches from a flat surface to a unit lens outline. The above-mentioned roots are marked by C in Figure 1(b) and Figure 2(b) section. When the interval between adjacent unit lenses is not flat but curved, etc., the vertical section of the unit lens in the extension direction may be the turning point of the contour line near the root of the unit lens as the root of the unit lens.

The thickness of the unit lens may be adjusted as long as the size of the scattering distribution of the reflected light can be adjusted on the surface of the resin leather obtained by the release sheet of the present embodiment, and can be appropriately adjusted according to the width and shape of the unit lens.

Specifically, the thickness of the unit lens is preferably in the range of 10 μm to 150 μm, more preferably in the range of 15 μm to 150 μm, and particularly in the range of 15 μm to 40 μm. If the thickness of the unit lens is greater than the above range, it is greater than the thickness of the release layer of the release sheet, so there may be cases where transfer is impossible; on the other hand, if it is less than the above range, although the unit lens and the surface of the resin leather formed by it The function caused by the shape of the unit lens is almost unchanged, but there will still be circumstances that increase the difficulty of manufacturing.

Here, the "unit lens thickness" refers to the length from the root to the top if it is a convex unit lens; if it is a concave unit lens, it refers to the length from the root to the bottom, as shown in Figure 1( b) The part marked with D in Figure 2(b).

The unit lens system only needs to have a curved surface capable of adjusting the scattering distribution of the reflected light in the resin leather obtained by using the release sheet of this embodiment, and can be appropriately set according to the shape of the unit lens and the like. The unit lens has a curved surface as long as the radius of curvature of the unit lens is in the range of 15 μm to 150 μm (15 μm or more and 150 μm or less), and preferably it is in the range of 15 μm to 40 μm (15 μm or more and 40 μm or less). If the cross-sectional shape of the unit lens is an asymmetric shape, it is preferable that the radius of curvature of the smallest curvature portion is within the above range.

The surface of the unit lens only needs to have at least a part of it having a curved surface represented by the radius of curvature, and it also covers that a part of the surface is a flat surface.

The width, thickness, and radius of curvature of the above unit lens can be measured using a laser microscope, AFM, SEM, etc. to obtain a cross-sectional profile. For example, using a laser microscope (OLS4000 manufactured by OLYMPUS), using a laser microscope in the imaging mode to obtain height data, and then using the measurement mode to display the cross-sectional profile, and with the cursor can calculate the width, thickness, and radius of curvature of the unit lens.

The lens unit is formed by arranging plural unit lenses.

In the above lens section, the plurality of unit lenses arranged may all have the same shape and the same size, or a plurality of unit lenses of different shapes or sizes may be mixedly arranged.

Furthermore, when a plurality of unit lenses of different shapes or sizes are mixedly arranged, the unit lenses of different types may have a certain regular configuration, or may be arranged irregularly.

The arranged plural unit lens may have a symmetrical cross-sectional shape in all thickness directions, or may be a lens in which a part of the unit has an asymmetrical cross-sectional shape.

The number of unit lenses arranged, etc., can be appropriately selected according to the use and design of the resin leather obtained by the release sheet related to this embodiment.

In the above lens portion, all of the plural unit lenses may have a convex shape with respect to the lens portion forming surface of the release layer, or all of the plural unit lenses may have a concave shape with respect to the lens portion forming surface of the release layer. Especially in this embodiment, it is better All the mirrors have a convex shape with respect to the lens portion forming surface of the release layer. That is, the focal points of the plural unit lenses are preferably located inside the release layer or the substrate. The reasons for this are as described above.

In the above-mentioned lens part, the plural unit lenses are arranged such that the roots of adjacent unit lenses can be arranged adjacent to each other without an interval, or adjacent unit lenses can be spaced apart according to a required interval, which can be matched with the unit lens The size, the forming method, and the design required for the resin leather obtained by using the release sheet of this embodiment are appropriately selected. In general, it is preferable that plural unit lenses are arranged without an interval.

When the adjacent unit lenses are arranged with an interval therebetween, the above-mentioned interval is preferably appropriately set within a range satisfying the unit lens width and arrangement pitch.

The arrangement pitch of the unit lenses may be adjusted as long as the reflected light scattering distribution on the surface of the resin leather obtained by the release sheet of the present embodiment can be adjusted, and it is particularly preferable that the unit lens shape of the resin leather is not easily visible. For example, the above-mentioned arrangement pitch is preferably set to be 1 times or more and 5 times or less per unit lens width, particularly preferably 1 times or more and 2 times or less, and particularly preferably 1 times. If the arrangement pitch is larger than the above range, because there are more flat parts on the surface of the release layer, the optical characteristics of the resin leather may be reduced. In addition, it is difficult to design to make the arrangement pitch smaller than the above range.

The so-called “arrangement distance of unit lens” is the part indicated by P in FIGS. 1(b) and 2(b). When the adjacent unit lenses are not spaced apart from each other, the arrangement pitch of the unit lenses is the same as the width of the unit lenses.

The arrangement of the plural unit lenses of the lens section described above is The surface of the resin leather obtained by the state release sheet is configured to adjust the scattering distribution of the reflected light, and the rest is not particularly limited. It can be designed as a one-dimensional arrangement or two according to the shape of the unit lens. Dimensional arrangement.

Here, the “one-dimensional arrangement” is exemplified in FIGS. 6( a) and (b ), for example, and refers to the one-dimensional direction in which the unit lens 3 a (cylindrical lens) of the plural unit lens is formed on the lens portion forming surface of the release layer 2. Arranged configuration. The lens portion composed of this arrangement is called a "lenticular lens". In addition, FIG. 6(a) is a schematic perspective schematic view of another example of the release sheet of the present embodiment, and FIG. 6(b) is a cross-sectional view taken along line X-X in FIG. 6(a).

On the other hand, the "two-dimensional arrangement" is exemplified in FIGS. 1 and 2, for example, and refers to the unit lens 3 a (microlens) facing the two-dimensional direction (lens section) on the lens section forming surface of the release layer 2. The arrangement of the surface is arranged in the vertical and horizontal directions). The lens portion configured in this arrangement is called a "microlens array." Furthermore, when the unit lenses are formed in a two-dimensional arrangement, the cylindrical lenses may also be arranged in a pattern in a two-dimensional direction.

The two-dimensional arrangement of the unit lens is not particularly limited. For example, the square lattice arrangement illustrated in FIGS. 1 and 2 may be a zigzag arrangement or a hexagonal dense arrangement.

In addition, the arrangement pitch of the unit lenses may also be different, and different pitches may or may not have certain regularity.

(2) Release layer

The release layer is usually formed using resin. The above-mentioned resin system only needs to be able to mold the desired unit lens, and when manufacturing the resin leather using the release sheet of this embodiment, the resin of the resin leather can be easily peeled off, such as thermoplastic resin and hardened resin. The term "cured resin" refers to a resin (thermosetting resin) that is cured by heating a thermosetting resin, or a tree that is cured by irradiating free radiation curing resin with free radiation Grease (free radiation hardening resin). In addition, the radiation-radiation-curable resin system includes, for example, ultraviolet-curing resin and electron beam-curing resin.

Here, the "free radiation" refers to an electromagnetic wave or a charged particle beam that has energy quantum (energy quantum) radiation capable of polymerizing or cross-linking molecules, such as ultraviolet rays and electron beams. Electromagnetic waves such as gamma rays; ion beams such as alpha rays and ion beams. Among them, ultraviolet rays and electron beams are preferred.

For the thermoplastic resin system, for example: acrylic resins such as polymethyl methacrylate; polyolefin resins such as polyethylene, polypropylene, and polymethylpentene; polyethylene terephthalate, polyterephthalic acid Polyester resins such as butadiene; styrene resins such as polystyrene; vinyl resins such as polyvinyl chloride; polycarbonate resins; polysiloxane resins; polyvinyl alcohol; Japanese Patent Laid-Open No. 2015-27811, etc. Known conventional resins such as the disclosed interpolymers.

Examples of thermosetting resins include unsaturated polyester, melamine, epoxy, polyester (meth)acrylate, urethane (meth)acrylate, epoxy (meth)acrylate, and polyether (Meth)acrylate, polyol (meth)acrylate, melamine (meth)acrylate, tri Department of acrylate.

Examples of the free radiation curable resin system include urethane resins, epoxy resins, ester resins, acrylic resins, and acrylate copolymers.

Among them, the resin is preferably a thermoplastic resin and more preferably a polypropylene. The reason is that the required unit lens can be imparted to the surface of the release layer with good accuracy, and when the release sheet is used to produce resin leather in this embodiment, the peelability from the resin leather can be improved.

The release layer system can be transparent, semi-transparent or opaque. In addition, the release layer may be colored.

The thickness of the release layer may be as long as the unit lens of a desired shape and the lens portion belonging to the aggregate can be provided on the surface, for example, within a range of 1 μm to 200 μm, and preferably within a range of 20 μm to 50 μm. If the thickness of the release layer is greater than the above range, the amount of materials and costs used in forming the release layer and the overall manufacturing cost of the release sheet may increase; on the other hand, if it is less than the above range, there will be The unit lens of the required shape and the lens part belonging to the aggregate cannot be provided. In addition, the so-called "thickness of the release layer" is the portion marked with T in FIGS. 1(b) and 2(b).

Furthermore, a release layer may be provided on the lens portion forming surface of the release layer. The reason is that the peelability during resin leather production can be improved. Examples of the material system of the peeling layer include polysiloxane resin and fluorine resin. These resins are applied to the lens portion forming surface of the release layer and can be formed by drying.

The thickness of the peeling layer may be a thickness that does not impair the shape of the lens portion forming surface of the release layer, and is preferably about 0.1 μm to 3 μm, for example. The reason is that if it is below the above range, the peeling force may be insufficient, and if it is above the above range, the shape deviation may become larger.

Furthermore, instead of providing a peeling layer, the release layer may contain a release agent. Examples of the release agent system include conventionally known materials, and for example, the release agent disclosed in Japanese Patent Laid-Open No. 2015-039847 can be used.

When the light from the release layer system enters the lens portion (the lens portion forming surface) from the vertical direction (incident angle 0°), the scattering angle at the scattered light intensity distribution curve with respect to the scattering angle is 20% in the scattered light intensity distribution curve with respect to the scattering angle The absolute value S _(80-20) of the difference between the scattering angle and the scattered light intensity at 80% is preferably 4° or more and 15° or less, and more preferably S _(80-20) is 4° or more and 8° the following.

When the S _(80-20) value is within the above range, the scattered light intensity distribution curve has a sharp slope, and the scattered light intensity anisotropy of the reflected light becomes smaller. Therefore, the scattered light intensity distribution curve of the resin leather obtained using the release sheet of this embodiment also exhibits the same slope, and the anisotropy of the scattered light intensity becomes smaller. With this, the above-mentioned resin leather can exhibit the required design.

If the S _(80-20) value of the _release layer is greater than the above range, the slope of the scattered light intensity distribution curve becomes gentle, and the anisotropy of the scattered light intensity becomes large. Therefore, the resin leather obtained by using the release sheet of the present embodiment is also similar, because the anisotropy of the scattered light intensity becomes larger and the influence due to diffuse reflection becomes larger, so the appearance of high gloss design tends to be difficult. On the other hand, if S _{(80-20) of the release} layer is smaller than the above range, it is difficult to shape the lens portion of the desired shape.

In addition, FIG. 7 is an explanatory diagram illustrating the difference between the scattering angle when the scattered light intensity is 20% and the scattering angle when the scattered light intensity is 80% in the scattered light intensity distribution curve.

Furthermore, the light diffusion angle of the lens part (lens part forming surface) of the release layer is preferably greater than 5° and 90° or less, and more preferably 10° or more and 60° or less. If the diffusion angle exceeds the above range, the influence due to diffuse reflection becomes larger. On the other hand, if the diffusion angle is lower than the above range, the influence due to specular reflection becomes larger. Therefore, the resin obtained by the release sheet of the present embodiment is used. Leather is not easy to show the required design. The so-called "in the lens part (through The light diffusion angle of the mirror portion forming surface), that is, the diffusion angle when light enters the lens portion (lens portion forming surface) from the vertical direction (incidence angle 0°).

2. Base material

The base material of the release sheet of this embodiment supports the release layer.

The above-mentioned substrate is mentioned before the release layer can be formed, and the rest is not particularly limited. For example, it can be a substrate of a conventionally known material used in a release sheet or process paper for general resin leather production. Specific examples include nonwoven fabrics, woven fabrics, and laminates of these. Can be used for example: Kraft paper, high-grade paper, coated paper and other paper; polyethylene terephthalate, polyethylene naphthalate and other polyesters; various nylon and other polyamides; polypropylene and other resin films; synthetic paper, Metal foil, woven cloth, non-woven cloth, etc. These systems can be used alone or appropriately stacked.

Among them, the base material is preferably paper from the viewpoints that when the resin leather is manufactured using the release sheet of the present embodiment, thermal degradation is unlikely to occur and the adhesion to the release layer is high.

Furthermore, 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. In this case, the substrate and the release layer can also be integrated.

The thickness of the above-mentioned base material is not particularly limited, and can be appropriately set in accordance with the material of the base material, etc. It is preferably set in the range of, for example, 50 μm to 200 μm.

For the surface of the base material close to the release layer side, for the purpose of improving the adhesion between the release layer and the release layer, easy adhesion treatment such as corona discharge treatment, ozone treatment, etc., Or surface treatment such as primer coating.

3. Any layer

The release sheet of this embodiment is provided with at least a release layer and a substrate on which the lens portion has been formed, but any layer may be provided as necessary.

For example, when the surface of the substrate is non-smooth, in order to form the release layer uniformly, a smoothness improvement layer may be provided between the substrate and the release layer. The smoothness improvement layer system may be, for example, a smoothness improvement layer composed of a composition disclosed in Japanese Patent Laid-Open No. 2002-086622 or the like, or a clay court layer.

Furthermore, an adhesion layer may be provided between the base material and the release layer. The reason is to improve the adhesion between the substrate and the release layer. The material system of the primer layer may be, for example, a fluorine-based coating agent or a silane coupling agent.

4. Other

In the release sheet of this embodiment, the release layer may be integrated with the substrate. The so-called "the release layer is integrated with the substrate" is a single layer 5 formed of the same material as the release layer 2 and the substrate 1 as illustrated in Figs. 8(a) and (b). The material constituting the above-mentioned single layer can be, for example, the material described in the item “1. Release layer”.

The lens part and the like in the release sheet in which the relevant release layer is integrated with the base material are the same as those described above, and therefore will not be described here.

5. Optical characteristics

The release sheet of the present embodiment uses the unit lens provided on the surface and the lens portion belonging to the assembly thereof to adjust the scattering distribution of the light reflected by the lens portion forming surface whole.

S _(80-20) formed in the surface of the release sheet based lens unit according to the present embodiment and the light diffusing angle, preferably exhibit the above "1. the release layer" as described in item S _(80-20) and the light diffusing angle . The reason for this is already explained in the above item "1. Release layer", so it will not be repeated here.

6. Other aspects of release film in this embodiment

In another aspect of the release sheet of this embodiment, a lens portion having a plurality of unit lenses with curved surfaces is provided on the surface, and the radius of curvature of the unit lens is 15 μm or more and 150 μm or less.

In the release sheet of this embodiment, since the lens portion provided on the surface is composed of a plurality of unit lens complexes with a radius of curvature within a predetermined range, the above S _(80-20) and their respective diffusion angles can be respectively within a predetermined range Inside. In this way, the resin leather obtained by the release sheet of the present embodiment can adjust the scattering distribution of the reflected light generated on the surface, so that it can exhibit a high gloss feeling with suppressed oil shine, and the change of gloss feeling can be displayed in conjunction with the observation area The resulting design.

The details of the release films related to the other aspects mentioned above are as described above.

7. Manufacturing method of release film

The manufacturing method of the release sheet of the present embodiment is on the surface of the release layer formed on one surface of the base material, on the premise of a method that can give a plurality of unit lenses of a desired shape and a lens portion belonging to the assembly thereof, the rest There is no particular limitation, and the material used when forming the release layer may be appropriately selected.

For example, if the resin-based free radiation hardening resin contained in the composition for the release layer is formed by coating the composition for the release layer on one surface of the substrate, then A transfer plate that has formed concave or convex portions corresponding to the desired unit lens shape is pressed against the coating layer and irradiated with free radiation to harden it, thereby forming a release layer having a lens portion on the surface.

On the other hand, if the resin-based thermoplastic resin contained in the composition for forming the release layer, the resin belonging to the composition for forming the release layer may be pressed against the substrate surface while being pressed against A transfer plate corresponding to a concave or convex portion corresponding to a desired unit lens shape has been formed, and a method of forming a release layer having a lens portion on the surface is formed. Alternatively, after applying the composition for forming the release layer on one surface of the substrate, the transfer plate having the concave or convex portions corresponding to the desired unit lens shape may be heated and pressed onto the coating Layer, and a method of forming a release layer provided with a lens portion on the surface.

8. Use

The release sheet system of the present embodiment is quite suitable as process release paper when manufacturing resin leather such as synthetic leather or artificial leather, but it is not limited to this. The release sheet of the present embodiment can be used as a production die for, for example, rubber sheets, carbon sheets, other resin sheets, or films in addition to the use of release sheets for resin leather production.

B. Resin leather

The resin leather of one embodiment of the present invention (hereinafter also referred to as "resin leather of this embodiment") is provided with a support layer and a resin skin layer. The resin skin layer is provided on the support layer, and the surface is provided with a lens-shaped portion composed of a plurality of unit lens shapes with curved surfaces arranged in plural.

The resin leather of this embodiment will be described with reference to the drawings. Figure 9(a) and figure 10(a) is a schematic perspective view showing an example and another example of resin leather of the present embodiment, and FIG. 9(b) and FIG. 10(b) are the lines XX in FIGS. 9(a) and 10(a). Sectional view. The resin leather 20 is provided with a support layer 11 and a resin skin layer 12. The resin skin layer 12 is disposed on the support layer 11, and the surface is provided with a lens shape portion 13 composed of a plurality of curved unit lens shapes 13 a arranged in plural.

An example of a convex curved surface shape in which the unit lens shape 13a protruding from the surface of the resin leather layer 12 shown in FIG. 9 is shown. An example of a concave curved surface shape in which the unit lens shape 13a is recessed on the surface of the resin leather layer 12 shown in FIG. The lens shape part 13 of FIGS. 9 and 10 has a microlens array shape.

According to the resin leather of the present embodiment, the surface of the resin skin layer of the resin leather is provided with a lens shape portion composed of a plurality of unit lens shapes with curved surfaces. Because the lens shape portion adjusts the scattering distribution of the reflected light, It has a high gloss feeling that suppresses the shine, and it can show the design due to the change of gloss feeling in conjunction with the observation area.

Hereinafter, the resin leather of this embodiment will be described according to each configuration.

1. Resin skin layer

The resin skin layer of the resin leather of this embodiment is formed (arranged) on the above-mentioned support layer, and the surface is provided with a lens-shaped portion composed of a plurality of curved unit lens shapes arranged in plural.

The resin skin layer is made of resin leather, and has a texture and color similar to natural leather.

The unit lens shape and lens shape portion of the relevant resin skin layer are the same as the unit lens and lens portion provided in the release layer described in the section of “A. Release sheet”, so they will not be repeated here.

In this embodiment, as shown in FIG. 10, it is preferable that the plurality of unit lens shapes have a concave shape with respect to the surface of the resin skin layer. The reason is that by setting the complex unit lens shape to a concave shape, the required designability can be exhibited by the lens shape portion, and the use of the resin skin layer can be reduced compared to the case where the unit lens shape having a convex shape is provided The amount of material.

The resin system used for the resin skin layer can be applied to rigid resins generally used in the manufacture of synthetic leather or artificial leather, such as nylon, polyurethane, and polyvinyl chloride. One type of resin type may be used alone, or two or more types may be used in combination.

Furthermore, the resin skin layer may contain additives such as plasticizers, stabilizers, colorants and the like.

The thickness of the resin skin layer is based on the premise that the required unit lens shape and the thickness of the lens shape part belonging to the aggregate can be provided, and the rest is not particularly limited, and can be appropriately designed according to the use and the like.

2. Support layer

The support layer of the resin leather of this embodiment supports the resin skin layer.

Support layer system such as: natural fibers such as kapok, hemp, wool, etc.; rayon, acetate, etc. Recycled or semi-synthetic fibers; woven cloth, non-woven cloth, mesh cloth, paper, polyester or polyolefin resin film composed of fibers of synthetic fibers such as polyamide, polyester, polyacrylonitrile, polyvinyl alcohol, and polyolefin; Metal plates, metal foils, glass plates, fiberglass woven fabrics, etc., can be selected from materials generally used for synthetic leather or artificial leather in accordance with the types and uses of resin leather.

The thickness of the support layer is based on the premise that it can support the thickness of the resin skin layer, and the rest is not particularly limited.

3. Other

The resin leather of this embodiment adjusts the scattering distribution of the reflected light such as the anisotropy of the scattered light intensity of the reflected light and the size of the diffusion angle by the lens-shaped portion provided on the surface, so that it can exhibit high gloss with suppressed oil shine Sense, and the observation area can show the design caused by the change of gloss.

In the resin leather of this embodiment, the resin skin layer and the support layer may be integrated. The so-called "resin skin layer and support layer are integrated" means that the release layer and the base material are a single layer formed of the same material. The material constituting the above-mentioned single layer may be, for example, the material described in the item “1. Resin skin layer”.

The lens-shaped portion and the like in the resin leather in which the relevant resin skin layer and the support layer are integrated are the same as those previously explained, so they will not be repeated here.

In the resin leather of this embodiment, it is preferable that the anisotropy of the scattered light intensity of the reflected light generated by the lens shape portion is small. The so-called "the anisotropy of the scattered light intensity is small" means that the "scattered light intensity distribution curve has a sharp slope".

Specifically, when light is incident from the vertical direction (incident angle 0°) toward the lens-shaped portion of the resin leather (a surface provided with the lens-shaped portion), the scattered light intensity distribution curve with respect to the scattering angle is 20 The absolute value of the difference between the scattering angle at% and the scattering angle at 80% of the scattered light intensity S _{(80-20) is} preferably 4° or more and 15° or less, and S _(80-20) is more preferable Above 4° and below 8°. The larger the value of S _(80-20) , the smoother the slope of the scattered light intensity distribution curve and the greater the anisotropy of the scattered light intensity, so the greater the impact caused by diffuse reflection. Therefore, the glossiness of the resin leather is reduced and becomes whiter, making it difficult to exhibit high-gloss design. On the other hand, if S _{(80-20) is} smaller than the above range, it is difficult for the surface of the resin leather to have a lens-shaped portion of a desired shape.

Furthermore, the resin leather system of this embodiment can show high gloss in a desired observation area. The so-called "observation area where resin leather can be observed with high glossiness" refers to "within the diffusion angle range of the lens shape portion of resin leather".

Specifically, the light diffusion angle of the lens-shaped portion (including one surface of the lens-shaped portion) of the resin leather is preferably greater than 5° and 90° or less, and more preferably 10° or more and 60° or less. If the diffusion angle of the lens-shaped portion of the resin leather exceeds the above range, the influence due to diffusion reflection will increase, and it may be difficult to obtain a high gloss feeling. On the other hand, if the diffusion angle is smaller than the above range, the influence due to specular reflection will become larger, and there may be a case where the glossiness is higher and the glossiness is more easily inspected. The light diffusion angle of the lens shape portion, that is, the diffusion angle when light enters the lens shape portion from the vertical direction (incidence angle 0°).

The observer can observe the high gloss feeling of the resin leather in the observation angle region corresponding to the above-mentioned diffusion angle.

4. Another aspect of the resin leather of this embodiment

In another aspect of the resin leather of this embodiment, a plurality of lens-shaped portions having a unit lens shape with a curved surface are provided on the surface, and the radius of curvature of the unit lens shape is 15 μm or more and 150 μm or less.

The lens shape portion provided on the surface of the resin leather system of this embodiment is composed of a plurality of unit lens shapes having a radius of curvature within a predetermined range, so the above S _(80-20) and each diffusion angle can be within a predetermined range, respectively . In this way, the resin leather of the present embodiment can adjust the scattering distribution of the reflected light generated on the surface, so that it can exhibit a high gloss feeling with suppressed oil shine, and the design property resulting from the change in gloss feeling can be exhibited in conjunction with the observation area.

The details of the resin leather in another aspect described above are as described above.

5. Manufacturing method of resin leather

The manufacturing method of the resin leather of this embodiment uses the release sheet described in the section "A. Release sheet" to form the desired unit lens shape and the lens belonging to the aggregate on the surface of the resin skin layer of the resin leather On the premise of the method of the shape part, the rest is not particularly limited, and a conventionally known method of manufacturing synthetic leather or artificial leather using a release sheet can be adopted. The manufacturing method of resin leather can be dry method or wet method

For example, when the resin leather is manufactured by the dry method, the resin skin layer forming composition is coated on the surface of the release layer of the release sheet described in the section "A. Release sheet", and dried to form the resin skin layer, and then After the support layer is laminated on the above resin skin layer, after drying and aging, the release sheet is peeled off to obtain resin leather. The adhesive layer system may use a conventionally known composition used in the production of resin leather.

As long as the composition for forming the resin skin layer can form the desired resin skin layer, Yes, it can be selected according to the type of resin leather.

For example, in the case of resin leather-based polyurethane synthetic leather, a polyurethane paste containing a polyurethane and any additives and having a solid content of about 20% by mass to 50% by mass may be used for the resin skin layer forming composition. In addition, in the case of a resin leather-based polyvinyl chloride synthetic leather, a gel or the like containing polyvinyl chloride and any additives may be used as the composition for forming the resin skin layer.

The method of applying the composition for forming a resin skin layer is to use a known method in combination with the composition of the composition for forming a resin skin layer.

6. Use

The resin leather system of this embodiment can be used for general synthetic leather applications. Also, it can be used as a substitute for natural leather. Specific applications include, for example, clothing materials, leather bags, shoes, wallets, smartphone cover skin materials, interior building materials, instrument panels, car seat skin materials, steering wheel skin materials, and other vehicle interior materials or seat materials for two-wheeled locomotives Wait. FIGS. 11(a) and (b) and FIGS. 11(c) and (d) are schematic diagrams of an example of a bag 50 and an instrument panel 60 using the resin leather of this embodiment, respectively. 11(b) and (d) are cross-sectional views corresponding to the Y-Y line in FIGS. 11(a) and (c), respectively.

[Example]

The following examples and comparative examples illustrate the present invention in more detail.

[Examples 1 to 10 and Comparative Examples 1 to 2] 1. Preparation of the transfer plate

Using the following methods, the transfer plates used in Examples 1 to 10 were prepared and compared The transfer plates used in Examples 1-2.

(Transfer plates 1 to 10 used in Examples 1 to 10)

In the copper-plated extrusion cylinder (diameter: 100mm , 300 mm in width) on the surface, after forming a reversed shape pattern corresponding to the unit lens shape of Example 1 shown in Table 1 by mechanical cutting, the surface is subjected to chrome plating to obtain a transfer plate 1. The transfer plates 2-10 used in the related examples 2-10 are also obtained in the same way.

According to various embodiments, a transfer plate is installed on the roller embossing device.

(Transfer plates 11 to 12 used in Comparative Examples 1 to 2)

For copper-plated extrusion cylinder (diameter: 100mm , 300 mm wide) After the surface is subjected to chrome plating, the treated surface is roughened by sandblasting to obtain the transfer plate 11 in such a manner that the surface roughness of Comparative Example 1 shown in Table 2 is obtained. The transfer plate 12 used in the related comparative example 2 was also obtained by the same method.

According to each comparative example, a transfer plate was mounted on the roller embossing device.

2. Manufacturing of release film

On one side of the paper substrate (thickness 150 μm), polypropylene is coated in a thickness of 50 μm to form a release layer, and the transfer plate 1 is heated and pressed on the release layer according to the following conditions to transfer the pattern. The release sheet of Example 1 (roll width 300 mm) was obtained. In related examples 2-10, and comparative examples 1-2, the release sheet was also obtained by the same method.

(Transfer condition)

‧Extrusion temperature: 120℃

‧Press force: 150kgf/cm

‧Transport speed: 5m/min

The shape and details of the surface of the release layer of the obtained release sheet are shown in Table 1 and Table 2. The release sheet obtained in Examples 1 to 10 is a lentil lens belonging to an assembly of cylindrical lenses (unit lenses) provided with a lens portion on the surface of the release layer. In addition, the surface of the release layer of the release sheet system obtained in Comparative Examples 1 to 2 has a sandblasted rough surface with a predetermined surface roughness.

3. Manufacture of resin leather (synthetic leather)

Using each of the release sheets obtained in Examples 1 to 10 and Comparative Examples 1 to 2, on the release layer of each release sheet, a composition for forming a resin skin layer was coated by a bar coating method consisting of the following composition The polyurethane composition for the skin layer constituting the synthetic leather is heated and dried at 100°C to 120°C for 2 minutes. Then, the base fabric (support layer) was bonded to the coating layer using an adhesive, and after drying and aging, the release sheet was peeled off to obtain synthetic leather.

(Composition for resin skin layer formation)

‧Polyurethane (RESAMINE NE-8811 manufactured by Dairi Refinery Industry Co., Ltd.)...100 parts by weight

‧Colorant (made by SEIKASEVEN NET-5794 produced by Heiday Nikko Chemical Industry Co., Ltd.)... 15 parts by weight

‧Toluene...25 parts by weight

‧Isopropyl alcohol (IPA)...25 parts by weight

4. Evaluation

The following evaluation was performed about the synthetic leather obtained using the release sheet obtained by Examples 1-10 and Comparative Examples 1-2. The evaluation results are shown in Table 1 and Table 2.

(1) Usage of polyurethane

When the amount of polyurethane (containing a colorant) of the synthetic leather obtained using the release sheet of Example 1 was set to 1, the synthetic leather obtained using the release sheets of Examples 2 to 10 and Comparative Examples 1 to 2 was measured. The weight ratio of the amount of polyurethane (including colorant).

(2) Diffusion angle and S _(80-20) value

The synthetic leather obtained using the release sheets obtained in Examples 1 to 10 and Comparative Examples 1 to 2 was subjected to scattered light intensity measurement, and the diffusion angle and S _(80-20) value were calculated from the obtained scattered light intensity distribution curve . The intensity of the scattered light is a three-dimensional variable-angle spectrophotometric color measurement system (GCMS-13 type, manufactured by Murakami Color Technology Research Institute Co., Ltd.), which is directed toward the surface of the resin leather with a lens-shaped part and enters the vertical direction (incident angle 0°) The intensity of each scattering angle is measured according to the condition that the light receiving angle is within the range of -60°~60° and the variable angle interval is 1°. In addition, the scattered light intensity distribution curve system uses a scattering angle as the X axis and a scattered light intensity as the Y axis, and plots the scattered light intensity with respect to each scattering angle.

(3) Viewability of unit lens shape

A 100 mm square sample was cut from the synthetic leather obtained using the release sheets of Examples 1 to 10, the sample was placed on a table, and unit lens shape recognition was performed from a position of 500 mm above.

In addition, a 100 mm square sample was cut from the synthetic leather obtained using the release sheets of Comparative Examples 1 and 2, the sample was placed on a table, and the rough shape of the sandblasted rough surface was identified from a position of 500 mm above.

The test environment is set to 400 lux (equivalent to a bright office). Calculate the number of people that can be inspected from 10 subjects (20 years old to 60 years old) and make the following judgment.

◎◎: 0 digits (not visible at all)

◎: 1~2 digits (can hardly be seen)

○: 3 to 7 (slightly visible)

△: 8 digits or more (visible)

(4) Appearance evaluation

Place each sample used in "(3) Unit lens shape visibility" on a table, and confirm the appearance of the sample in an environment with an illumination of 400 lux (equivalent to a bright office). Among the 10 subjects (20 years old to 60 years old), when the number of people who felt the glossiness reached 7 or more, the sample was evaluated as "high glossiness (high glossiness)". The oily sensation system is rated as “oily sensation” in the sample of 10 people (20 to 60 years old), and the number of people who strongly feel the oily sensation is 7 or more.

As a result of the above-mentioned appearance evaluation, the release sheets of Examples 1 to 10 are provided with a lens portion composed of a complex arrangement of unit lenses with curved surfaces on the surface, so the synthetic leather obtained using the release sheet feels that the gloss is suppressed The high gloss feel confirms the design that appears in accordance with the change in gloss of the observation area. On the other hand, the release of Comparative Examples 1-2 The sheet is not provided with a unit lens with a curved surface and a lens part belonging to its assembly. The synthetic leather obtained using the release sheet does not feel high gloss, but appears whiteish, and it is impossible to confirm the matching observation area The design of the gloss is changed.

The synthetic leather obtained by using the _release sheets of Comparative Examples 1 and 2 shows the above-mentioned inspection results because the S _(80-20) value is not within the required range (4° or more and 15° or less).

Furthermore, from the results of the above-mentioned appearance evaluation, among the synthetic leathers obtained using the release sheets of Examples 1 to 10, the synthetic leathers obtained using the release sheets of Examples 7 and 8 had a high glossiness, but they were shiny The feeling is stronger than other embodiments. The synthetic leather obtained by using the release sheets of Examples 1 to 6 and Examples 9 to 10 has a diffusion angle within the required range (greater than 5° and below 90°), so it is not The synthetic leathers obtained from the release sheets of Examples 7 to 8 within the required range show that they can obtain a higher gloss effect.

In addition, in Examples 4 to 6, Example 8, and Example 10, the unit lens of the release sheet is formed to have a convex shape with respect to the lens portion forming surface of the release layer, so compared to Examples 1 to 3, Example 7 and Example 9 can reduce the amount of polyurethane used in the manufacture of synthetic leather.

Claims (15)

A release sheet is provided with: a base material; and a release layer, which is provided on the base material, and has a lens portion composed of a plurality of unit lenses with curved surfaces arranged on the surface; the release layer is formed on When light enters the lens portion from the vertical direction, the difference between the scattering angle at the scattered light intensity of 20% and the scattering angle at the scattered light intensity of 80% is 4° or more in the scattering intensity distribution curve with respect to the scattering angle And below 15°. The release sheet according to claim 1, wherein the plurality of unit lenses are convex with respect to the surface of the release layer. The release sheet according to claim 1, wherein the width of the unit lens is 30 μm or more and 300 μm or less. The release sheet according to any one of claims 1 to 3, wherein the release layer contains a thermoplastic resin. The release sheet according to any one of claims 1 to 3, wherein the release layer contains polypropylene. The release sheet according to any one of claims 1 to 3, wherein the diffusion angle of light when entering the lens portion from the vertical direction is greater than 5° and not more than 90°. A release sheet provided with a lens portion having a plurality of unit lenses with curved surfaces on the surface; the radius of curvature of the unit lens is 15 μm or more and 150 μm or less; when light enters the lens portion from a vertical direction, relative to the scattering angle In the scattering intensity distribution curve of, the absolute value of the difference between the scattering angle when the scattered light intensity is 20% and the scattering angle when the scattered light intensity is 80% is 4° or more and 15° or less. The release sheet according to claim 7, wherein the diffusion angle when light enters the lens portion from the vertical direction is greater than 5° and less than 90°. A resin leather comprising: a support layer; and a resin skin layer, which is provided on the support layer, and has a lens-shaped portion composed of a plurality of unit lens shapes with curved surfaces arranged on the surface; the resin skin layer system When light enters the lens-shaped portion from the vertical direction, the difference between the scattering angle of the scattered light intensity at 20% and the scattering angle at 80% of the scattering intensity distribution curve with respect to the scattering angle is 4 ° above and below 15°. The resin leather according to claim 9, wherein the plurality of unit lens shapes are concave shapes with respect to the surface of the resin skin layer. The resin leather according to claim 9 or 10, wherein the resin skin layer contains at least one of nylon, polyurethane, and polyvinyl chloride. The resin leather according to claim 9 or 10, wherein the diffusion angle of light when entering the lens-shaped portion from the vertical direction is greater than 5° and less than 90°. A resin leather, the surface of which is provided with a plurality of curved lens-shaped lens-shaped parts; the unit lens shape has a radius of curvature of 15 μm or more and 150 μm or less; when light enters the lens-shaped part from the vertical direction, the In the scattering intensity distribution curve of the scattering angle, the difference between the scattering angle when the scattered light intensity is 20% and the scattering angle when the scattered light intensity is 80% is 4° or more and 15° or less. The resin leather according to claim 13, wherein the surface is provided with a plurality of lens-shaped portions having a unit lens shape with a curved surface; the width of the unit lens shape is 30 μm or more and 300 μm or less. The resin leather according to claim 13 or 14, wherein the diffusion angle of light when entering the lens-shaped portion from the vertical direction is greater than 5° and less than 90°.