TWI551922B - Reflective material - Google Patents

Description

Reflective material

The present invention relates to a reflective material that is suitable for use as a member of a liquid crystal display, a lighting fixture, or a lighting kanban.

Reflective materials are used in various fields such as lighting fixtures or lighting panels, such as liquid crystal displays. Recently, the field of liquid crystal displays is evolving toward large-scale device and display performance, at least requiring more light to be supplied to the liquid crystal to improve the performance of the backlight unit, and the related reflective material also requires more excellent light reflectivity (also referred to as "Reflective").

For the related reflective material, for example, a reflective film for a liquid crystal display using a white polyester film containing an aromatic polyester resin as a main raw material is known (see Patent Document 1).

However, when an aromatic polyester-based resin is used as the reflective film, the aromatic ring contained in the molecular chain of the aromatic polyester-based resin absorbs ultraviolet rays, and ultraviolet rays are emitted from a light source such as a liquid crystal display device. This causes the reflective film to deteriorate and turn yellow, causing a problem that the light reflectance of the reflective film is lowered.

Further, it is also known that a film formed by adding a filler to a polypropylene resin is stretched to form a fine void in the film to cause a light-scattering reflection material (see Patent Document 2); Or an olefin-based resin light-reflecting body having a laminated structure of a base layer containing an olefin-based resin and a filler, and a layer containing an olefin-based resin (see Patent Document 3).

A reflective material using such an olefin-based resin has a feature that deterioration due to ultraviolet rays and yellowing are less.

Further, it is known that a reflection sheet composed of a resin composition not containing a large amount of inorganic powder contains a polypropylene resin and is incompatible with the polypropylene resin. At least one type of biaxially stretched reflection sheet having a reduced heat shrinkage ratio (see Patent Document 4).

The reflection sheet has a feature that the inorganic sheet is not contained in a large amount and exhibits a higher reflectance than a conventional reflection sheet having the same degree of basis weight and density.

On the other hand, since the conventional reflection sheet has a relatively smooth surface and a strong regular reflection property, when it is incorporated in a liquid crystal display and lights up a light source, there is a problem that the brightness of the screen is generated (so-called "luminance spot"). Case.

Therefore, in order to solve the problem of the luminance spot of the screen, it is proposed to form a reflection sheet having high light diffusibility by forming an organic fine particle or the like on the surface to form unevenness (see Patent Document 5).

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. Hei 04-239540

Patent Document 2: Japanese Patent Laid-Open No. Hei 11-174213

Patent Document 3: Japanese Patent Laid-Open Publication No. 2005-031653

Patent Document 4: Japanese Patent Laid-Open Publication No. 2008-158134

Patent Document 5: Japanese Patent Laid-Open Publication No. 2010-085843

As described above, in order to solve the problem of luminance spots when the reflective material is used in a liquid crystal display, various proposals have been made. However, it is still desired to provide a reflective material for a backlight having high luminance and low luminance.

Accordingly, it is an object of the present invention to provide a novel reflective material capable of suppressing the generation of luminance spots when high light diffusibility is exhibited.

The present inventors reviewed the state of the outermost surface of the surface on which the reflective surface was provided, and found that the resin layer (A) provided by the reflecting material was provided with the standard deviation of the surface angle calculated from the height distribution (σ, δ(n). ))) The diffuse reflection surface of the desired value can achieve the glow spot prevention effect, and the present invention has been completed.

That is, the reflective material proposed by the present invention is characterized in that a resin layer (A) is provided on the outermost layer provided with the reflective use surface, and the resin layer (A) is provided with a standard deviation of the surface angle calculated from the height distribution ( σ, δ(n)) have a diffuse reflection surface of 8.0° or more.

The reflective material proposed by the present invention is provided with a resin layer (A) having a specific surface angle standard deviation (σ, δ(n)) provided on the outermost layer of the reflective use surface, and thus appears by the resin layer (A). The high light diffusibility has the advantage of suppressing the generation of luminance spots.

Therefore, the reflective material can be preferably applied to a reflective material such as a liquid crystal display, a lighting fixture, or a lighting kanban.

Fig. 1 is a conceptual diagram showing an example of a mechanism for forming a light guide plate in contact with a luminance spot.

Hereinafter, a reflecting material (referred to as "this reflecting material") according to an example of the embodiment of the present invention will be described. However, the present invention is not limited to the present reflective material.

<this reflective material>

The reflective material is provided with a reflective material having a resin layer (A) having a predetermined diffused reflection surface as the outermost layer of the reflective use surface.

The present reflective material may be provided with the resin layer (A) and a resin layer (B) having a void therein.

Hereinafter, the resin layers (A) and (B) will be described in detail.

<Resin layer (A)>

The resin layer (A) is located on the outermost layer provided with the reflective use surface, and is characterized in that the surface deviation standard deviation (σ, δ(n)) calculated from the height distribution of the surface of the diffuse reflection surface is 8.0° or more. .

(highly distributed)

The "height distribution" is a dispersion indicating the height of the section of an arbitrary line segment on the measurement area. When the height from the reference plane is Zn with respect to the position (Xn, Yn), the set of (Xn, Yn, Zn) is used. Said. (Xn, Yn) satisfies the following formula: dx=X _n+1 -X _n = a certain value, dy=Y _n+1 -Y _n = a certain value

(standard deviation of face angle)

The "face angle δ(n)" is a value calculated from the height distribution, and is specifically obtained by the following equation. The standard deviation (σ, δ(n)) of the obtained face angle δ(n) is calculated and used as a statistical value.

δ(n)=arctan(Z'(n))*180/π

Z'(n)=(Z _n+1 -Z _n )/(dx ² +dy ² ) ^0.5 However, dx ² +dy ² ≠0

The resin layer (A) is provided with a surface state (diffusion reflection surface) having a specific surface angle standard deviation (σ, δ(n)) as described above, and is responsible for preventing the effect of the glow spot.

In addition, the constituent material of the resin layer (A) is not particularly limited, and it is possible to use various thermoplastic resins or the like before the surface standard deviation (σ, δ(n)).

It is important that the surface standard deviation (σ, δ(n)) of the surface of the resin layer (A) is 8.0° or more from the viewpoint of the prevention of the luminance spot.

The resin layer (A) is formed on the resin layer (A) by a diffuse reflection surface having such a standard deviation of the surface angle and having a concavo-convex structure, and the resin layer (A) has high diffuse reflectivity and prevents the luminance spot.

From this point of view, it is important that the standard deviation (σ, δ(n)) of the surface angle of the surface of the resin layer (A) is 8.0 or more, and more preferably 9.0 or more.

Generally, the intensity of the reflected light in the direction of the normal reflection is the strongest, and the shape of the surface is combined with the diffuse reflection component other than the direction of the regular reflection. On the other hand, in the minute region, it is considered that the larger the angle of reflection of the diffuse reflection component is. Therefore, assuming that the variation in the plane angle is larger, the light diffusibility is better, and the standard deviation (σ, δ(n)) of the plane angle is in good correlation with the light diffusibility.

The method for forming the resin layer (A) having the required standard deviation of the surface angles (σ, δ(n)) can be, for example, three methods described below, that is, (1) a method using embossing processing, and (2) utilizing A method of press-bonding and a method of (3) a method of mixing two or more types of thermoplastic resins. Among these, the resin layer (A) is preferably formed by the method of (3).

(Surface roughness)

Further, the resin layer (A) is not a coating layer having an uneven structure formed of organic or inorganic spherical fine particles, but is preferably provided with a surface average roughness (Sa) having a three-dimensional surface roughness. A layer of a surface of 0.90 μm or more.

Here, the "coating layer having a concavo-convex structure formed of organic or inorganic spherical fine particles" means that a part or all of the spherical fine particles are exposed from the coating film surface of the binder to form a concavo-convex structure. Layer.

Accordingly, the resin layer (A) is located at the outermost layer provided with the reflective use surface, and the coating layer having the uneven structure is not formed by the organic or inorganic spherical fine particles, but has a three-dimensional surface roughness. The unevenness of the surface roughness (Sa) of 0.9 μm or more is responsible for preventing the light guide plate from being closely attached to the glow spot.

In addition, the constituent material of the resin layer (A) is not particularly limited, and any of the thermoplastic resin or the like can be used.

Here, a layer having a surface having a surface roughness (Sa) of a three-dimensional surface roughness of 0.90 μm or more is formed in the resin layer (A) of the present reflecting material, and the purpose and effect thereof will be described.

That is, the problem of smoothness of the surface of the reflecting sheet is such that, for example, when the light guide plate is deformed by load or heat, it occurs in a place in close contact with the reflecting sheet, and excessive brightness occurs in the portion, and linear or spotted brightness appears. The phenomenon of spots (generally referred to as white spots, etc. Hereinafter, in the present specification, this phenomenon is also simply referred to as "light guide plate adhesion brightness spot").

Such a light guide plate is closely attached to the luminance spot. It is assumed that the metal back cover on the back surface of the reflection sheet is provided with a concavo-convex structure, and since the contact portion between the concavo-convex and the reflective material is strongly adhered to each other, it is likely to occur. FIG. 1 is a conceptual diagram showing a mechanism for generating a bright spot of a light guide plate.

In the method of reacting the light guide plate with the bright spot, the surface of the reflective material is generally subjected to a coating layer to form irregularities.

When such an application layer is formed, when an external force is applied to the light guide plate by pressure, heat, or the like, the fine particles forming the uneven structure can hinder the strong adhesion between the light guide plate and the reflective material without collapsing. Therefore, it is considered that the light guide plate can be effectively prevented from being in close contact with the luminance spot.

At this time, the higher the hardness of the fine particles, the more likely it is to collapse. Although the light guide plate is more effectively prevented from being in close contact with the luminance spot, if the hardness is too high, friction occurs when the reflective material and the light guide plate are rubbed due to vibration. The lattice of the light guide plate is ground by the particles.

Furthermore, the application of the fine particle coating to the reflective material also involves an increase in the number of steps and an increase in cost. If a special step such as coating is not used, a concave-convex structure is formed on the surface. It can be said that great advantages.

Therefore, by providing the outermost layer provided with the reflective use surface and not forming the fine particle coating on the reflective material, the resin layer (A) having the specific surface roughness (surface average roughness Sa) is formed. In the same manner as in the case of forming a fine particle coating layer, since the adhesion between the resin layer (A) and the light guide plate is prevented, generation of luminance spots due to adhesion of the light guide plate can be suppressed.

As described above, the object and effect of the resin layer (A) of the present reflecting material can be achieved by forming a layer having a surface having a surface roughness (Sa) of a ternary surface roughness of 0.90 μm or more.

Accordingly, the surface average roughness (Sa) of the surface of the resin layer (A) having a ternary surface roughness is preferably 0.9 μm or more from the viewpoint of preventing the brightness of the light guide plate from being closely attached to the luminance spot, and if it is 1.2 μm or more, It is particularly preferable to prevent the light guide plate from being closely attached to the luminance spot.

Further, the surface average roughness (Sa) of the ternary surface roughness is a value measured in accordance with the description of the following examples.

The method for forming the uneven structure resin layer (A) having the surface average roughness (Sa) can be, for example, three methods described below, that is, (1) a method using embossing, and (2) using a press transfer. The method to be carried out and (3) a method of mixing two or more kinds of thermoplastic resins. Among these, the resin layer (A) is preferably formed by the method of (3).

(method using embossing processing)

(1) The method of performing embossing can be, for example, a pair of pressure rollers formed by a roller having a embossing pattern provided by one of the rollers and an elastic body on the other surface, from the T-die a method of producing a film having a embossing by extruding a resin which is heated and melted; a method of imparting a embossing pattern to the film by pressurizing the film between the hot stamping plate and the embossing forming die; One of them is a pair of heated and pressed rolls provided with a embossed roll and the other is a pair of heating rolls, and a method of applying a embossing to the film by passing the film while heating and pressing.

In the case of embossing, it is advantageous to form a surface having an arbitrary surface angle by designing the surface angle of the embossed shape. However, it is not limited to these.

(using the method of press-transfer transfer)

(2) A method of performing press-transfer, for example, intermittently press-forming a fine uneven shape on a surface of a sheet material wound in a roll shape, and transferring a fine shape on a surface of the sheet material The method of patterning.

However, by the fine shape pattern design of the mold, although it is possible to shape an arbitrary surface angle, when processing a large size or a wide sheet, heating and cooling take time, and the cycle time is obviously elongated. A concern that leads to poor productivity.

(Method of mixing two or more thermoplastic resins)

(3) When a resin layer (A) having a standard deviation (σ, δ(n)) of a desired surface angle is formed by mixing two or more kinds of thermoplastic resins, the thermoplastic resin (I) and the thermoplastic resin (I) thereof The incompatible thermoplastic resin (II) focuses on the solubility parameters (hereinafter referred to as "SP value") of the two kinds of resins to be mixed, or the absolute value of the apparent viscosity difference, or both.

Regarding the SP value, it is preferred to select a combination in which the absolute value of the difference in SP value is 0.3 to 3.0 (cal/cm ³ ) ^0.5 , more preferably 0.5 to 1.5 (cal/cm ³ ) ^0.5 .

In addition, when three or more types of thermoplastic resins are mixed, the absolute value of the absolute value of the difference in solubility parameter (SP value) between the two thermoplastic resins is obtained.

According to this, by adjusting the absolute value of the SP value difference of the mixed resin within the above range, the dispersibility of the two kinds of resins to be mixed is appropriately adjusted, and the standard deviation of the surface angle of the formed resin layer (A) can be made The above values. If the SP value difference of the mixed resin reaches an absolute value of 0.5 (cal/cm ³ ) ^0.5 or more, a non-compatible thermoplastic resin (II) dispersed phase is formed in the resin layer (A), and the resin layer (A) is adjusted. The surface angle of the surface, 俾 can exhibit high diffusivity, so it is preferred.

On the other hand, if the absolute value of the SP value difference of the mixed resin is 3.0 (cal/cm ³ ) ^0.5 or less, the dispersed phase of the incompatible thermoplastic resin (II) in the resin layer (A) is stably formed, and the resin The film forming property of the layer (B) is also stable, which is preferable.

According to the method of mixing the two or more types of thermoplastic resins, the resin layer (A) is formed in comparison with the coating layer having the uneven structure formed by the organic or inorganic spherical fine particles, and the number of steps can be suppressed. A major feature of the advantages of increased cost and increased cost.

The relative apparent viscosity (η) and the melt viscosity at the extrusion processing temperature (shear rate: a value at 100 (1/sec)) are absolute values, preferably 1000 (Pa.s) or less.

Further, it is preferable that the smaller the SP value difference between the two thermoplastic resins selected is, the smaller the apparent viscosity difference is. By adjusting the apparent viscosity (η) to a certain value or less, the dispersion diameter of the non-coherent resin can be made fine, and the standard deviation of the surface angle (σ, δ(n)) of the resin layer (A) to be formed becomes 8.0°. As described above, the surface average roughness (Sa) of the formed resin layer (A) can be made 0.9 or less.

(Technology using SP value difference of non-compatible resin)

Here, it is possible to form a resin having a desired standard deviation of surface angles (σ, δ(n)) by mixing two or more thermoplastic resins having a predetermined absolute value of the difference in solubility parameter (SP value) within a certain range. The layer (A) can simultaneously form a concavo-convex structure having a desired surface average roughness (Sa), which will be described in detail below.

More specifically, the SP value of one of the thermoplastic resins (I) is preferably 5.0 to 15.0 (cal/cm ³ ) ^0.5 , more preferably 7.0 (cal/cm ³ ) ^0.5 or more or 12.0 (cal/cm ^{3 ).} ) ^0.5 or less.

Further, the SP value of the other thermoplastic resin (II) is preferably 5.3 to 14.7 (cal/cm ³ ) ^0.5 , more preferably 7.3 (cal/cm ³ ) ^0.5 or more or 11.7 (cal/cm ³ ) ^0.5. the following.

From this technical idea, it is known that the thermal property resin (I) having an SP value within the above range is selected as the candidate resin 1, and the SP value is in the above range and is non-phase with the thermoplastic resin (I). The dissolved thermoplastic resin (II) is selected as the candidate resin 2, and the standard deviation of the surface angles of the three-dimensional surface roughness (σ, δ(n)) is selected from the resin layers formed by the combination of the candidate resins 1 and 2. When the surface average roughness (Sa) of the surface roughness of 8.0° or more or the three-dimensional surface roughness is 0.5 or more, the resin layer (A) can be formed.

In addition, the SP value is the evaporation energy (Δei) and the molar volume (Δvi) of the atoms and atomic groups constituting the thermoplastic resin (I) or the non-compatible thermoplastic resin (II), which are substituted into the following Fedors formula. Can be obtained.

SP value (cal/cm ³ ) ^0.5 = (Σ△ei/Σ△vi) ^0.5

Here, Δei and Δvi use constants proposed by Fedors (refer to Table 1). Table 1 is an excerpt from the evaporation energy and molar volume of the atoms and radicals proposed by Fedors.

Further, in the resin layer (A), the thermoplastic resin (I) and the incompatible thermoplastic resin (II) may be a single resin or two or more resins. For example, one type of thermoplastic resin (I-1) and two types of thermoplastic resins (II-1) and (II-2) which are incompatible with each other may be contained.

Further, in addition to the thermoplastic resin (I-1) and its non-compatible thermoplastic resin (II-1), it may contain, for example, a thermoplastic resin (I-2) and its non-compatible thermoplastic resin (II- 2) A combination of two or more types.

A sea-island structure formed of a thermoplastic resin (thermoplastic resin (I-1) and its non-compatible thermoplastic resin (II-1), when there are multiple island phases or a plurality of marine phases, only such a requirement is required The absolute value of the maximum SP value of the marine phase and the island phase can be absolute.

For example, when the SP value of the thermoplastic resin (I-1), the thermoplastic resin (I-2), and the thermoplastic resin (II-1) is (I-1) < (II-1) < (II-2) It is only required to take the absolute value of the SP value difference between the thermoplastic resin (II-2) which is the largest difference and the thermoplastic resin (I-1).

In addition, from the viewpoint of the effect of the standard deviation (σ, δ(n)) of the surface angle of the surface of the resin layer (A) to a desired value, or the surface average roughness (Sa) of the surface of the resin layer (A) is the effect of the above 0.5μm viewpoint, the thermoplastic resin (I) a thermoplastic resin incompatible therewith (II) (in other words, SP value difference absolute value of ^{0.3 ~ 3.0 (cal / cm 3} ) 0.5 of the mixed resin composition) the amount of resin It is preferably 70% by mass or more, more preferably 80% by mass or more, and particularly preferably 90% by mass or more of the total resin constituting the resin layer (A).

In addition, the content ratio (mass ratio) of the thermoplastic resin (I) and the incompatible thermoplastic resin (II) is from the viewpoint of stably forming a dispersed phase and roughening the surface of the resin layer (A). Preferably, the system is 60:40~90:10, or 40:60~10:90, wherein Better 70:30~80:20, or 30:70~20:80.

However, since the thermoplastic resin (I) and the thermoplastic resin (II) are many, which may be different from the parent phase or the dispersed phase, it is based on the roughening effect of the surface of the resin layer (A). the same.

That is, either of the thermoplastic resin (I) and the thermoplastic resin (II) may be a matrix resin. The matrix resin of the resin layer (A) is preferably an amorphous resin having a glass transition temperature of 85 to 150 ° C from the viewpoint of imparting heat resistance.

(Technology using poor fusion viscosity of non-compatible resin)

Next, a method of mixing two or more kinds of thermoplastic resins is used to form an absolute value of the difference in apparent viscosity (shear rate: 100 (1/sec)) at an extrusion processing temperature to a predetermined range. A method of forming the unevenness of the standard deviation of the surface angles (σ, δ(n)) and forming the uneven structure having the desired surface average roughness (Sa) can be described in detail below.

Generally, in a mixed system of a thermoplastic resin (I) and a non-compatible thermoplastic resin (II), the smaller the absolute value of the apparent viscosity difference between the resins, the more the dispersion diameter is slightly dispersed, and it is presumed that it affects the surface shape. , involving the angle of the face and its changes.

Therefore, the absolute value of the apparent viscosity difference can be considered as an absolute value of the difference from the aforementioned SP value, which contributes to the increase in the surface angle of the hybrid system and its variation.

Therefore, it is preferable to adjust the apparent viscosity in accordance with the SP value difference between the resins used. Specifically, the larger the SP value difference between the resins, the larger the absolute value of the difference in apparent viscosity, and the smaller the SP value difference between the resins used is, the smaller the absolute value of the apparent viscosity difference is. .

For example, it is confirmed by the following examples, such as a combination of COP (SP value: 7.4) and PP (SP value: 8.0) (SP value difference: 0.6), when the absolute value of the SP value is 0.6 or more and less than 1.4, The formed sea-island structure has an absolute difference in apparent viscosity (η) (shear rate: value under 100 (1/sec)) between the sea phase and the island phase at the extrusion processing temperature (230 ° C). It is preferably 1200 (Pa.s) or less, more preferably 1000 (Pa.s) or less.

In addition, in a sea-island structure formed of a thermoplastic resin (thermoplastic resin (I-1) and its incompatible thermoplastic resin (II-1), when there are plural island phases or plural marine phases, plural seas The absolute value of the difference between the phase and the island phase is preferably within the above range.

(further feature added)

The glass transition temperature (JIS K-7121, Tg) using, for example, a thermoplastic resin (I) or The amorphous resin of 85 to 150 ° C can also impart heat resistance to the present reflective material.

In addition, the term "matrix resin of the resin layer (A)" means a resin having a mass of 50% by mass or more, preferably 70% by mass or more, and more preferably 90% by mass or more based on the total mass of the resin layer (A).

The term "amorphous resin" as used herein refers to a resin having an extremely low degree of crystallization which is not observed by crystallization, or which has a crystal melting heat of 10 J/g or less.

The amorphous resin has a stable property below the glass transition point even if the ambient temperature changes, and since it has a small shrinkage ratio and excellent dimensional stability until the temperature near the glass transition point, it can be reflected. The material imparts high heat resistance.

Therefore, when the glass transition temperature (Tg) of the thermoplastic resin (I) is, for example, 85 to 150 ° C, the matrix resin of the resin layer (A) has sufficient heat resistance even when used as a constituent member such as a liquid crystal display. It is preferred.

From this viewpoint, the glass transition temperature (Tg) of the matrix resin of the resin layer (A) is more preferably 90° C. or higher and 150° C. or lower, and particularly preferably 100° C. or higher and 150° C. or lower.

Such an amorphous resin may, for example, be a cycloolefin resin, a polystyrene, a polycarbonate, an acrylic resin, an amorphous polyester resin, a polyether quinone, a thermoplastic polyimine or the like.

Among them, in view of elongation, glass transition temperature range, and transparency, a cycloolefin type resin, a polystyrene, a polycarbonate resin, and particularly a cycloolefin type resin are particularly preferable.

Here, the cycloolefin resin of the resin layer (A) may be any of a cycloolefin homopolymer and a cyclic olefin copolymer.

The "cycloolefin-based resin" refers to a polymer compound in which a main chain is composed of a carbon-carbon bond structure and at least a part of the main chain has a cyclic hydrocarbon structure. The cyclic hydrocarbon structure is A compound such as an alkene, a tetracyclododecene or the like having at least one olefinic double bond in a cyclic hydrocarbon structure is used as a monomer and introduced.

The cycloolefin resin can be classified into an addition (co)polymer of a cyclic olefin or Any of the hydride, the addition copolymer of a cyclic olefin and an α-olefin, or a hydrogenated product thereof, a ring-opened (co)polymer of a cycloolefin, or a hydrogenated product thereof can be used for the present reflective material.

Specific examples of the cycloolefin-based resin include, for example, cyclopentene, cyclohexene, cyclooctene, and a monocyclic cycloolefin such as cyclopentadiene or 1,3-cyclohexadiene; bicyclo [2.2.1] Hept-2-ene (common name: drop Alkene, 5-methylbicyclo[2.2.1]hept-2-ene, 5,5-dimethyl-bicyclo[2.2.1]hept-2-ene, 5-ethyl-bicyclo[2.2.1] Hept-2-ene, 5-butyl-bicyclo[2.2.1]hept-2-ene, 5-ethylene-bicyclo[2.2.1]hept-2-ene, 5-hexyl-bicyclo[2.2.1 Hept-2-ene, 5-octyl-bicyclo[2.2.1]hept-2-ene, 5-octadecyl-bicyclo[2.2.1]hept-2-ene, 5-methylene-bicyclic [2.2.1] a bicyclic cyclic olefin such as hept-2-ene, 5-vinyl-bicyclo[2.2.1]hept-2-ene, 5-propenyl-bicyclo[2.2.1]hept-2-ene; Tricyclo[4.3.0.12,5]癸-3,7-diene (commonly known as: dicyclopentadiene), tricyclo[4.3.0.12,5]non-3-ene; tricyclic [4.4.0.12,5 Eleven carbon-3,7-diene or tricyclo[4.4.0.12,5]undec-3,8-diene, or a partial hydride (or cyclopentadiene and cyclohexene) Adduct) tricyclo [4.4.0.12,5]undec-3-ene; 5-cyclopentyl-bicyclo[2.2.1]hept-2-ene, 5-cyclohexylbicyclo[2.2.1 a tricyclic cycloalkene such as hept-2-ene, 5-cyclohexenylbicyclo[2.2.1]hept-2-ene, 5-phenyl-bicyclo[2.21]hept-2-ene; tetracyclic [4.4.0.12, 5.17, 10] dodec-3-ene (also referred to as "tetracyclododecene"), 8-methyltetracyclo [4.4.0.12, 5.17, 10] twelve carbon 3-ene, 8-ethyltetracyclo[4.4.0.12, 5.17,10]dodec-3-ene, 8-methylenetetracyclo[4.4.0.12,5.17,10]dodecyl-3- Alkene, 8-ethylenetetracyclo[4.4.0.12, 5.17,10]dodec-3-ene, 8-vinyltetracyclo[4,4.0.12,5.17,10]dodec-3-ene a tetracyclic cycloalkene such as 8-propenyl-tetracyclo[4.4.0.12, 5.17,10]dodec-3-ene; 8-cyclopentyl-tetracyclo[4.4.0.12, 5.17,10] Dodec-3-ene, 8-cyclohexyl-tetracyclo[4.4.0.12, 5.17,10]dodec-3-ene, 8-cyclohexenyl-tetracyclo[4.4.0.12, 5.17,10] Dodec-3-ene, 8-phenyl-cyclopentyl-tetracyclo[4.4.0.12, 5.17,10]dodec-3-ene; tetracyclo[7.4.13,6.01,9.02,7]10 Tetracarbon-4,9,11,13-tetraene (also known as "1,4-methylene-1,4,4a,9a-tetrahydroanthracene"), tetracyclic [8.4.14, 7.01, 10.03, 8] fifteen carbon-5,10,12,14-tetraene (also known as "1,4-methylene-1,4,4a,5,10,10a-hexahydroindole"); five rings [6.6 .1.13,6.02,7.09,14]-4-hexadecenene, pentacyclo[6.5.1.13,6.02,7.09,13]-4-pentadecene, pentacyclo[7.4.0.02,7.13,6.110,13 -4-pentadecene; heptacyclo[8.7.0.12, 9.14, 7.111, 17.03, 8.012, 16]-5-noncarbene, heptacyclo[8.7.0.12, 9.03, 8.14, 7.012, 17.113, 16] -14-nonyl carbene; cyclopentane A polycyclic cycloolefin such as a tetramer of a diene or the like.

These cycloolefins may be used alone or in combination of two or more.

Specific examples of the α-olefin copolymerizable with the cyclic olefin include, for example, ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 3-methyl 1-pentene, 3-ethyl-1-pentene, 4-methyl-1-pentene, 4-methyl 1-hexene, 4,4-dimethyl-1-hexene, 4 , 4-dimethyl-1-pentene, 4-ethyl-1-hexene, 3-ethyl-1-hexene, 1-octene, 1-decene, 1-dodecene, 1 A carbon number of 2 to 20, such as tetradecene, 1-hexadecene, 1-octadecene or 1-decene, preferably ethylene or an α-olefin having 2 to 8 carbon atoms.

These α-olefins may be used alone or in combination of two or more.

The method for polymerizing a cycloolefin or a cycloolefin, an α-olefin, and a method for hydrogenating the obtained polymer are not particularly limited, and can be carried out according to a known method.

In the above cycloolefin-based resin, from the viewpoint of heat resistance, the glass transition temperature (Tg) is preferably 70 to 170 ° C, more preferably 80 ° C or more and 160 ° C or less, and particularly preferably 85 ° C or more and 150 ° C. The following cycloolefin resin.

In this case, two or more kinds of cycloolefin resins may be mixed and mixed, and the glass transition temperature (Tg) of the mixed resin may be adjusted within the above range.

Commercially available products can be used as the cycloolefin resin. For example, "ZEONOR (registered trademark)" (chemical name: hydride of ring-opening polymer of cyclic olefin) manufactured by Japan ZEON Co., Ltd., "ABEL (registered trademark)" by Mitsui Chemicals Co., Ltd. (ethylene and tetracyclic twelve) Addition copolymer of carbene) or "TOPAS (registered trademark)" manufactured by Polyplastics Co., Ltd. Addition copolymer of alkene) and the like. In addition, "ZEONOR (registered trademark)" (chemical name: hydride of a ring-opening polymer of a cyclic olefin) manufactured by ZEON Co., Ltd., and / or "TOPAS (registered trademark)" (ethylene) manufactured by Polyplastics Co., Ltd. And down It is particularly preferable that an addition copolymer of an olefin can obtain a reflective material having high reflection performance.

In addition, when cycloolefins are used, olefins are used. When the copolymer of ene is reduced The content of the olefin is preferably 60 to 90% by weight, more preferably 65% by weight or more and 80% by weight or less.

The amorphous resin (in the case of an amorphous resin containing two or more components, the total amount thereof) is preferably 50% by mass or more, more preferably 70% based on the total mass of the resin layer (A). More than or equal to 100% by mass (except 100%).

As described above, when the matrix resin of the resin layer (A) (for example, the thermoplastic resin (I)) is an amorphous resin having a glass transition temperature of 85 to 150 ° C, the bending resistance is enhanced from the viewpoint of strengthening. An olefin-based resin or a thermoplastic elastomer containing a resin other than the thermoplastic resin (I), for example, a thermoplastic resin (II), or the like is preferable.

For example, when a olefin-based resin and/or a thermoplastic elastomer other than a cycloolefin-based resin is blended in a cycloolefin-based resin to form a resin layer (A), a single cycloolefin-based resin can be obtained. It is resistant to bending and heat resistance which cannot be obtained by using an olefin-based resin alone.

In this case, the melt flow rate (referred to as "MFR") of the olefin resin and/or the thermoplastic elastomer other than the cycloolefin resin is preferably 0.1 g/10 min or more or 20 g/10 min or less (JIS K7210, 230). ° C, load 21.18 N), more preferably 0.5 g/10 min or more, or 10 g/10 min or less.

Further, the MFR of the cycloolefin resin is preferably adjusted to the above range. When the MFR is adjusted in this way, the olefin-based resin and/or the thermoplastic elastomer other than the cycloolefin-based resin are aligned in the cycloolefin-based resin, and the mechanical properties used as the reflective material are not extremely extreme. It is better to worry about the deterioration.

The olefin-based resin other than the cycloolefin resin may be, for example, a polypropylene resin such as polypropylene or a propylene-ethylene copolymer; a polyethylene resin such as polyethylene, high-density polyethylene or low-density polyethylene, or the like, which may be used alone. One of these may be used, or two or more types may be used in combination. Among them, polyethylene resin (PE) and polypropylene resin (PP) are preferable, and in particular, from the viewpoint that the melting point is higher than that of the polyethylene resin and the heat resistance is excellent, and the mechanical properties such as the modulus of elasticity are high, it is more preferable. Polypropylene resin.

Further, from the viewpoint of extrusion moldability, in the polypropylene resin, the MFR (230 ° C 21.18 N) is preferably 0.1 g/10 min to 20 g/10 min, more preferably 0.2 g/10 min or more or 10 g/10 min. Hereinafter, a polypropylene resin of 0.5 g/10 min or more or 5 g/10 min or less is particularly preferable.

On the other hand, the thermoplastic elastomer system may, for example, be an olefin-based elastomer, a styrene-based elastomer, an urethane-based elastomer, or a polyester-based elastomer, and may be used alone or in combination. 2 or more types. Among them, since the styrene-based elastomer is compatible with the olefin-based resin and the special-purpose polypropylene resin, it is preferable from the viewpoint of improving the adhesion between the resin layer (A) and the resin layer (B).

The styrene-based elastic system may, for example, be a copolymer of styrene and a conjugated diene such as butadiene or isoprene, and/or a hydrogenated product thereof. The styrene-based elastomer system treats styrene as a hard segment and the conjugated diene as a block copolymer of a soft segment, which is preferred because no sulfur addition step is required. Further, the heat stability at the time of hydrogenation is higher, so that it is more preferable.

Preferred examples of the styrene-based elastomer may be, for example, a styrene-butadiene-styrene block copolymer, a styrene-isoprene-styrene block copolymer, a styrene-ethylene-butene- Styrene block copolymer, styrene-ethylene-propylene-styrene block copolymer.

Among them, a styrene-ethylene-butylene-styrene block copolymer or a styrene-ethylene-propylene-styrene block copolymer which is a double bond of a conjugated diene component by hydrogenation is preferably used (also referred to as " Hydrogenated styrene elastomer").

(micro powder filler)

The resin layer (A) may also contain a fine powder filler. The type, particle diameter, and surface treatment method of the relevant fine powder filler are the same as those described in the following resin layer (B), and preferred examples are also the same.

(Form of resin layer (A))

The resin layer (A) may be a layer composed of a sheet, or may be a layer obtained by forming a film of a molten resin composition by extrusion or coating (non-sheet formation). In the case of a sheet, the sheet system may be an unstretched film, or may be a uniaxial or biaxially stretched film, preferably an extended film obtained by extending at least 1.1 times in a uniaxial direction, and more preferably a double axis. Extend the film.

(other ingredients)

The resin layer (A) may also contain an antioxidant, a light stabilizer, a thermal stabilizer, an ultraviolet absorber, a fluorescent whitening agent, a slip agent, a light diffusing material, and other additives.

Further, if a compatibilizing agent, a dispersing agent, or the like is also contained in a small amount, it may be blended.

<Resin layer (B)>

The resin layer (B) is a layer having voids inside, and can impart high reflectivity to the present reflecting material, and is preferably a layer capable of improving the bending resistance of the present reflecting material.

(Void ratio of resin layer (B))

The void ratio of the resin layer (B) (that is, the void ratio of the layer) is preferably from 10 to 90% from the viewpoint of ensuring reflectivity.

By designing the gaps in such a range, the whitening of the reflecting material can be sufficiently performed, so that high reflectivity can be obtained without causing a breakage of the mechanical strength of the reflecting material.

From such a viewpoint, the porosity of the resin layer (B) is preferably 20% or more or 80% or less, more preferably 25% or more or 75% or less, and particularly preferably 30% or more or 70%. %the following.

A method of forming a void in the resin layer (B) may be, for example, a chemical foaming method, a physical foaming method, a supercritical foaming method, an extension method, an extraction method, or the like. Among these, the present reflective material is preferably an extension method from the viewpoints of film forming properties, continuous productivity, and stable productivity.

Specific examples of the stretching method may be, for example, a roll stretching method, a rolling method, a tenter stretching method, or the like. Among these, in the present invention, since the stretching conditions of the roll stretching method and the tenter stretching method have a wide selection range, it is preferable to adopt such a method of using them individually or in combination and extending in at least one direction.

The extension may be, for example, a uniaxial stretching method extending in the machine direction (MD) by a roll stretching method, a uniaxial stretching method in the longitudinal direction, and then a lateral biaxial stretching method extending in the lateral direction (TD) by a tenter stretching method or the like. Or a synchronous biaxial stretching method in which the tenter stretching method is simultaneously extended in the longitudinal direction and the lateral direction. Further, from the viewpoint of improving reflectivity, biaxial stretching is preferred.

(matrix resin)

The resin (matrix resin) constituting the main component of the resin layer (B) may, for example, be an olefin resin, a polyester resin, an acrylic resin, a polyvinyl chloride resin, a polyvinylidene chloride resin or a fluorine resin. A polyether resin, a polyamine resin, a polyurethane resin, a diene resin, or the like. Among them, an olefin resin is preferred from the viewpoint of improving reflectivity.

The olefin-based resin may be, for example, a polypropylene resin such as polypropylene or a propylene-ethylene copolymer; a polyethylene resin such as polyethylene, high-density polyethylene or low-density polyethylene; or a cycloolefin system such as an ethylene-cyclic olefin copolymer. At least one type of polyolefin resin is selected among the resins (including the above cycloolefin-based resins).

Among these, from the viewpoints of mechanical properties, flexibility, and the like, polypropylene resin (PP) and polyethylene resin (PE) are preferable, and the melting point is high and the heat resistance is excellent as compared with PE. A viewpoint of a high mechanical property such as an elastic modulus is preferably a polypropylene resin (PP).

Among the polypropylene resins (PP), MFR (230 ° C, 21.18 N) is preferably 0.1 to 20 g/10 min, more preferably 0.2 g/10 min or more, or 10 g/10 min or less from the viewpoint of extrusion moldability. The polypropylene resin (PP) is preferably 0.5 g/10 min or more or 5 g/10 min or less.

In addition, the matrix resin contained in the resin layer (B) is preferably 30% by mass or more based on the total mass of the resin layer (B). From this point of view, it is more preferably 40% by mass or more, and particularly preferably 50% by mass or more (including 100%).

(micro powder filler)

The resin layer (B) is excellent in reflectivity, and preferably contains a fine powder filler. By containing a fine powder filler, in addition to obtaining refraction from the refractive scattering caused by the difference in refractive index between the matrix resin and the fine powder filler, it is also possible to use: Refraction scattering due to the difference in refractive index between the voids formed around it, and refraction scattering due to the difference in refractive index between the void formed around the fine powder filler and the fine powder filler are obtained.

The fine powder filler may, for example, be an inorganic fine powder or an organic fine powder.

The inorganic fine powder system may be, for example, calcium carbonate, magnesium carbonate, barium carbonate, magnesium sulfate, barium sulfate, calcium sulfate, zinc oxide, magnesium oxide, calcium oxide, titanium oxide, zinc oxide, aluminum oxide, aluminum hydroxide, hydroxyphosphorus ash. Hydrate (hydroxyapatite), cerium oxide, mica, talc, kaolin, clay, glass powder, asbestos powder, zeolite, citrate clay and so on. These may be used alone or in combination of two or more. Among these, in consideration of the difference in refractive index between the resin constituting the sheet, it is preferable to use calcium carbonate, barium sulfate, titanium oxide or zinc oxide having a refractive index of 1.6 or more.

Furthermore, the refractive index of titanium oxide is significantly higher than that of other inorganic fillers because the refractive index difference between the titanium oxide and the matrix resin becomes significantly larger, so that it can be used less than other fillers. The blending amount gives excellent reflectivity. Further, by using titanium oxide, high reflectance can be obtained even if the thickness of the reflective material is reduced.

Therefore, it is more preferable to use a filler containing at least titanium oxide. In this case, the amount of the titanium oxide is preferably 30% or more of the total mass of the inorganic filler, or when an organic filler and an inorganic filler are used in combination. Jiashida has a total mass of more than 30%.

Further, in order to enhance the dispersibility of the inorganic fine powder to the resin, the surface of the fine powder filler may be used, and a surface such as a lanthanoid compound, a polyol compound, an amine compound, a fatty acid, a fatty acid ester or the like may be used. Processor.

On the other hand, the organic fine powder system may be, for example, a polymer ball or a polymer hollow particle, and these may be used alone or in combination of two or more. Further, an inorganic fine powder and an organic fine powder may be used in combination.

The fine powder filler preferably has a particle diameter of 0.05 μm or more and 15 μm or less, more preferably 0.1 μm or more or 10 μm or less. If the particle size of the filler is 0.05 μm or more, the dispersibility to the matrix resin is not lowered, so that a homogeneous sheet can be obtained. Further, when the particle diameter is 15 μm or less, the interface between the matrix resin and the fine powder filler can be densely formed, and a highly reflective reflective material can be obtained.

In addition, the content of the fine powder filler is preferably from 10 to 80% by mass, more preferably from 10 to 80% by mass, based on the total of the resin layer (B), in consideration of the reflectability, mechanical strength, productivity, and the like of the reflective material. 20% by mass or more or 70% by mass or less.

When the content of the fine powder filler is 10% by mass or more, the area of the interface between the matrix resin and the fine powder filler can be sufficiently ensured, and the reflective material can be highly reflective. When the content of the fine powder filler is 80% by mass or less, the mechanical strength necessary for the reflecting material can be secured.

In the resin layer (B), the content ratio (mass ratio) of the matrix resin and the fine powder filler is preferably a matrix resin: a fine powder filler from the viewpoints of light reflectivity, mechanical strength, and productivity. 80:20~30:70, better 80:20~60:40.

(other ingredients)

The resin layer (B) may contain other resins than the above. Further, it may contain an antioxidant, a light stabilizer, a heat stabilizer, a dispersant, a UV absorber, a fluorescent whitening agent, a compatibilizing agent, a slip agent, and other additives.

(Form of resin layer (B))

The resin layer (B) may be a layer composed of a sheet, or may be a layer obtained by forming a film of a molten resin composition by extrusion or coating (non-sheet formation). In the case of a sheet, the sheet system may be an unstretched film, or may be a uniaxial or biaxially stretched film, preferably an extended film obtained by extending at least 1.1 times in a uniaxial direction, and more preferably a double axis. Extend the film.

<Laminated construction>

The present reflective material is only required to have a resin layer (A) on the outermost layer. For example, a laminated structure in which the resin layer (A) and the resin layer (B) are provided may be exemplified. By adopting such a structure, it is possible to impart respective characteristics to each of the resin layer (A) and the resin layer (B). For example, it is possible to impart reflectivity to the resin layer (B) and to maintain workability such as bending resistance, and to impart antistatic properties and high light diffusibility to the resin layer (A).

Accordingly, the present reflective material exhibits a multiplicative effect by the interaction of the resin layers (A) and (B), and the excellent reflectivity can be achieved.

In addition, by selecting the resin of the resin layer (A), heat resistance can be imparted, and when it is possible to exhibit higher reflectivity, heat resistance and workability can be imparted.

In such a laminated structure, the resin layer (A) is located at the outermost layer on the side where the light is irradiated (on the side of the reflection use surface). With such a structure, it is possible to impart high reflectivity to the reflective material.

For the other laminated structure, for example, a three-layer laminated structure of the resin layer (A) may be provided on both surfaces of the resin layer (B). Further, in addition to the resin layer (A) and the resin layer (B), another layer may be provided, or another layer may be interposed between the resin layer (A) and the resin layer (B). For example, an adhesive layer may be interposed between the resin layer (A) and the resin layer (B).

<thickness>

The thickness of the present reflective material is not particularly limited, but is preferably, for example, 30 μm to 1,500 μm. When considering the handleability of the practical surface, it is preferably 50 μm or more or 1000 μm or less.

For example, when used as a reflective material for a liquid crystal display, the thickness is preferably 50 μm to 700 μm. When it is used as a reflecting material for lighting fixtures and lighting kanbans, the thickness is preferably 100 μm to 1000 μm.

Even if the resin layer (A) is thin, the heat resistance of the entire reflective material can be improved. On the other hand, if the resin layer (A) is too thick, the bending resistance is lowered.

From this point of view, the total thickness ratio of each of the resin layer (A) and the resin layer (B) (for example, when the resin layer (B) is a double layer, the total thickness ratio of the two layers) is preferably 1:3 to 1 : 15, better system 1:3~1:10.

<Average reflectance>

The present reflective material is preferably an average reflectance of at least one side, and is set to be 97% or more for a wavelength of 420 nm to 700 nm. When such a reflectance is obtained, a good reflection property for a reflective material can be exhibited, and a liquid crystal display or the like in which the reflective material is incorporated can realize sufficient brightness of the screen.

<void rate>

In order to improve the reflectivity, the present reflective material is preferably provided with a layer having voids in the resin layer (B). The void ratio of the resin layer (B) (that is, the void ratio when the void is formed by stretching) is determined by the following formula for the film constituting the resin layer (B).

Void ratio (%) = {(film density before stretching - film density after stretching) / film density before stretching} × 100

<Manufacturing method>

The method for producing the present reflective material is not particularly limited, and a known method can be employed. Hereinafter, a method of manufacturing a reflective material having a laminated structure will be described as an example. However, it is not limited to the following manufacturing methods.

First, an amorphous resin such as a cycloolefin resin is blended with an olefin resin and/or a thermoplastic elastomer or other additives as needed to prepare a resin composition A.

Specifically, an olefin-based resin and/or a thermoplastic elastomer, other antioxidants, and the like are added to the cycloolefin-based resin, and are mixed by using, for example, a belt blender, a rotary drum, a Hanschel mixer, or the like. Thereafter, a temperature such as a melting point above the melting point of all the resins constituting the resin composition A (other than the powdery or liquid additive), specifically, a cyclic olefin, is used, for example, a Banbury mixer, a uniaxial or twin-screw extruder, or the like. Resin, olefin resin / or heat The plastic elastomer and the polymer type antistatic agent are kneaded at a temperature equal to or higher than the melting point of all the resins (for example, 220 ° C to 280 ° C) to obtain a resin composition A.

Alternatively, the resin composition A can be obtained by adding a predetermined amount to each of the cycloolefin resin, the olefin resin, and/or the thermoplastic elastomer by a feeder or the like.

In addition, an olefin-based resin and/or a thermoplastic elastomer, and other antioxidants are prepared so as to have a high concentration of a so-called "concentrated body", and the concentrate, a cycloolefin resin, and an olefin resin are further prepared. And/or the thermoplastic elastomer is mixed to form a resin composition A of a desired concentration.

On the other hand, a resin composition B is produced by adding a fine powder filler, other additives, etc. to an olefin resin as needed. Specifically, a fine powder filler or the like is added to the olefin-based resin of the main component as needed, and after mixing by using, for example, a belt blender, a drum, a Hansu blender, or the like, a Banbury mixer, for example, is used. For uniaxial or biaxial extruders, etc., depending on the melting point (for example, 190 ° C to 270 ° C) of the melting point of the olefin resin of the main component (other than the fine powder filler, other powdery or liquid additives), Resin composition B was obtained.

Alternatively, the resin composition B can be obtained by adding an appropriate amount to each of the olefin resin, the fine powder filler, or the like using a feeder or the like.

In addition, a fine powder filler, other additives, and the like are prepared as a so-called "concentrated body" in which an olefin resin is blended in a high concentration, and the concentrate and the olefin resin are mixed, and the desired product may be formed. Concentration of resin composition B.

Next, the resin compositions A and B obtained in this manner are dried, and then supplied to each of the other extruders, and heated to a predetermined temperature or higher to be melted.

Conditions such as extrusion temperature must be set in consideration of factors such as a decrease in molecular weight due to decomposition. For example, the extrusion temperature of the preferred resin composition A is 220 ° C to 280 ° C, and the extrusion temperature of the resin composition B is 190 ° C. ~270°C.

Then, the molten resin composition A and the resin composition B are merged into two types of three-layer T-die, and are extruded from the slit-shaped discharge port of the T-die into a layered shape, which is cured by a cooling roll. A cast piece is formed.

Preferably, the obtained cast sheet extends at least in a uniaxial direction.

By stretching, the interface between the olefin resin and the fine powder filler in the resin layer (B) is peeled off to form voids, and the whitening of the sheet is performed to improve the light reflectivity of the film.

Further, the cast piece is preferably extended in the biaxial direction. The void formed by only performing the uniaxial stretching can only be in a fibrous form extending in one direction. However, by performing biaxial stretching, the void extends in both the longitudinal and transverse directions to form a disk-like form.

In other words, by performing the biaxial stretching, the peeling area of the interface between the olefin resin and the fine powder filler in the resin layer (B) is increased, and the whitening of the sheet is further enhanced, and as a result, the film can be further improved. Light reflectivity.

Further, if the biaxial stretching is performed, the anisotropy in the shrinkage direction of the film is reduced, so that the film can be improved in heat resistance and the mechanical strength of the film can be increased.

The elongation temperature at the time of extending the cast sheet is preferably a temperature within a range of not less than a glass transition temperature (Tg) of the amorphous resin of the resin layer (A) and not more than (Tg + 50 ° C).

If the extension temperature is above the glass transition temperature (Tg), it can be carried out stably without stretching the film during stretching. Further, when the elongation temperature is at a temperature equal to or lower than (Tg + 50 ° C), the elongation and orientation are increased, and as a result, the void ratio is increased, so that a highly reflective film can be easily obtained.

The order of extension of the biaxial extension is not particularly limited, such as simultaneous biaxial extension and successive extension. After the melt film formation is performed by using the stretching device, the film is stretched toward the pulling direction (MD) of the film by the extension of the roll, and then extended by the tenter stretching in the orthogonal direction (TD) of the MD, or by the extension of the roll or the like. The shaft extends.

The stretching ratio at the time of performing the biaxial stretching is preferably an extension in which the area magnification is 6 times or more. By extending the area magnification by a factor of 6 or more, the void ratio of the entire reflective film composed of the resin layer (A) and the resin layer (B) can be made 40% or more.

After stretching, it is preferable to apply heat setting in order to impart dimensional stability (formal stability of voids) to the reflective film. The treatment temperature for thermally fixing the film is preferably from 110 ° C to 170 ° C. The processing time required for heat setting is preferably from 1 second to 3 minutes. Further, the extension device or the like is not particularly limited, and is preferably a tenter extension that can be thermally fixed after being stretched.

<Use>

The present reflective material can be used as a reflective material as it is, or can be used in a structure in which the present reflective material is laminated on a metal plate or a resin plate, and can be effectively used for, for example, a liquid crystal display device such as a liquid crystal display, a lighting fixture, or a lighting panel. Reflector.

In this case, the metal plate in which the present reflective material is laminated may be, for example, an aluminum plate, a stainless steel plate, or a galvanized steel sheet.

The method of laminating the present reflective material on a metal plate or a resin plate may, for example, be a method using an adhesive, a method in which thermal bonding is performed without using an adhesive, a subsequent method via an adhesive sheet, extrusion and coating. Method, etc. However, it is not limited to these methods.

More specifically, an adhesive such as a polyester, a polyurethane or an epoxy is applied to the surface of the metal plate or the resin plate (collectively referred to as "metal plate or the like") to which the reflective material is bonded. Can be attached to the reflective material.

In this method, a coating apparatus generally used such as a reverse roll coater or a light touch roll coater is used, and the thickness of the adhesive film after drying is made on the surface of a metal plate or the like on which the reflective material is bonded. The adhesive is applied in a manner of about 2 μm to 4 μm.

Then, the infrared heater and the hot air heating furnace are used to dry and heat the coated surface, and when the surface of the metal plate or the like is maintained at a predetermined temperature, the reflective material is immediately coated with a roll surface press and cooled. Obtain a reflector.

The use of the present reflective material can be effectively used as a reflective member used for a liquid crystal display device such as a liquid crystal display, a lighting fixture, a lighting kanban, or the like.

Generally, a liquid crystal display is composed of a liquid crystal panel, a polarizing reflection sheet, a diffusion sheet, a light guide plate, a reflection sheet, a light source, a light source reflector, and the like.

In the present reflective material, it is also possible to use a reflecting material that is effective for causing light from a light source to enter the liquid crystal panel or the light guide plate, and to illuminate the irradiation light from the light source disposed at the edge portion. And a light source reflector that is incident on the light guide plate.

<word description>

Generally speaking, "thin film" refers to a thin flat product which is extremely small in thickness and has a maximum thickness below the length and width. It is usually supplied in the form of a roll (Japanese Industrial Specification) JIS K6900), and generally referred to as "slices" in the definition of JIS, refers to thinner, generally flat products having a thickness much smaller than the length and width. However, the boundary between the sheet and the film is not determined. In the present invention, since it is not necessary to distinguish between the two in the text, in the present invention, the case of "film" also covers "sheet", and the case of "sheet" is called Also covers "film".

In addition, in this specification, when it is described as "main component", unless otherwise stated, it is intended to contain other components within a range that does not impede the function of the main component. In this case, the content ratio of the main component is not specified, but the main component (in the case where the two components or more are the main components, the total amount thereof) is 50% by mass or more, preferably in the composition. 70% by mass or more, more preferably 90% by mass or more (including 100%).

In the present invention, when it is described as "X~Y" (X, Y is an arbitrary number), the meaning of "X or more and Y or less" and "better than X" are included unless otherwise stated. And the meaning of "preferably less than Y".

Further, in the present invention, when it is described as "X or more" (X-type arbitrary number), unless otherwise stated, the meaning of "better than X" is included, and it is described as "Y or less". In the case of (Y is an arbitrary number), the meaning of "better than Y" is covered unless otherwise stated.

[Examples]

The following examples are given to illustrate the invention in more detail. However, the present invention is not limited to the above, and various applications can be made without departing from the technical idea of the present invention.

<Measurement and evaluation method>

Next, the measurement methods and evaluation methods of various physical property values of the samples obtained in Examples 1-1 to 1-3 and Comparative Examples 1-1 to 1-2 will be described. Hereinafter, the direction of the traction (flow) of the film is referred to as "MD", and the direction of the orthogonal direction is referred to as "TD".

(apparent viscosity)

The apparent viscosity of the reflective material (sample) was measured in accordance with the apparatus and conditions described below.

Measuring device: High-pressure flow testing machine (CFT-500C/Shimadzu Corporation)

Measuring conditions: nozzle 1×L10mm

Temperature: 230 (°C)

Cutting speed: 100 (1/sec)

(reflected light diffusivity)

The reflected light intensity of the reflective material (sample) was measured in accordance with the following apparatus and conditions, and the intensity ratio of the specular reflection component to the diffuse reflection component was calculated by substituting the following formula.

Reflected component intensity ratio α = Σ (reflected light intensity of -5 degrees to 5 degrees) / Σ (reflected light intensity of 25 degrees to 35 degrees)

Reflected component intensity ratio β = Σ (reflected light intensity of 55 degrees ~ 65 degrees) / Σ (reflected light intensity of 25 degrees ~ 35 degrees)

Device: Automatic variable angle photometer "GP-1R type" (Murako Color Technology Research Co., Ltd.)

Light source: halogen lamp

Beam aperture diameter: 10.5mm

Light diaphragm diameter: 4.5mm

Light incident direction: TD of film

Light incident angle: -30 degrees

Spectral measurement range of reflected light: -30 degrees to 90 degrees

Measurement interval: 1 degree

The reflection component intensity ratios α and β were evaluated for light diffusibility with reference to the following evaluation criteria. Among them, the symbols "○" and "△" are above the practical level.

= evaluation benchmark =

"○": the intensity ratio of reflected components is higher than or equal to 0.5 and above

"△": The reflection component intensity ratio is 0.5 or more in either of α or β

"X": the intensity ratio of the reflected components is less than 0.5 between α and β.

(standard deviation of the face angle)

The surface (resin layer A) of the reflective material (sample) was observed according to the following apparatus and conditions, and the obtained height distribution was analyzed to calculate the surface angle (δ(n)), and the standard deviation (σ, δ (n) )) is used as a statistical value.

Device: Electron beam three-dimensional roughness analysis device "ERA-4000" (manufactured by ELIONIX)

Evaporation conditions: 10 mA × 100 sec, Pt-Pd evaporation

Acceleration voltage: 10kV

Observation magnification: 250 times

Analysis area: 360 (μm) × 480 (μm)

<Example 1-1>

(Production of Resin Composition A of Resin Layer (A))

The amorphous cyclic olefin resin A (Japan ZEON Co., Ltd., trade name "ZEONOR RCY15" cyclic olefin ring-opening polymerization of a hydride thereof, the density ^{(ISO1183): 1.01g / cm 3} , MFR (230 °C, 21.18N, JIS K7210: 1.2g/10min, glass transition temperature Tg (JIS K7121): 127 ° C, SP value: 7.4), amorphous cycloolefin resin B (manufactured by Japan ZEON Co., Ltd., product "ZEONOR 1060R", a hydrogenated product of a ring-opening polymer of a cyclic olefin, density (ISO1183): 1.01 g/cm ³ , MFR (230 ° C, 21.18 N, JIS K7210): 12 g/10 min, glass transition temperature Tg ( JIS K7121): pellets at 100 ° C, SP value: 7.4), and polypropylene resin (manufactured by Nippon Polypropylene Co., Ltd., trade name "NOVATEC PP EA9", density (JIS K7112): 0.9 g/cm ³ , MFR ( The pellets of 230 ° C, 21.18 N, JIS K-7210): 0.5 g/10 min, SP value: 8.0) were mixed at a mass ratio of 50:25:25, and then subjected to a twin-screw extruder heated to 230 ° C. After granulation, the resin composition A was obtained.

(Production of Resin Composition B of Resin Layer (B))

Polypropylene resin (manufactured by Nippon Polypropylene Co., Ltd., trade name "NOVATEC PP FY6HA", density (JIS K7112): 0.9 g/cm ³ , MFR (230 ° C, 21.18 N, JIS K-7210): 2.4 g/ 10 min) of granules and titanium oxide (KRONOS Corporation, trade name "KRONOS 2230", density 4.2 g/cm ³ , rutile-type titanium oxide, Al, Si surface treatment, TiO ₂ content: 96.0%, production method: chlorination The mixture was subjected to granulation at a mass ratio of 50:50, and granulation was carried out using a twin-screw extruder heated to 270 ° C to obtain a resin composition B.

(production of reflective material)

The resin compositions A and B were respectively supplied to extruders A and B heated to 230 ° C and 200 ° C, and melt-kneaded at 230 ° C and 200 ° C in each extruder, and then combined. It flows through two types of three-layer T-die and is extruded in a sheet form in a three-layer structure in which the resin layer (A)/resin layer (B)/resin layer (A) is formed, and is solidified by cooling. Laminated sheets.

The obtained laminated sheet was stretched by a 2.5-fold roll toward the MD at a temperature of 135 ° C, and further stretched by 2.5 times at 150 ° C toward the TD, thereby performing biaxial stretching to obtain a thickness of 225 μm (resin layer (A): 185 μm, resin layer (B): 20 μm laminate ratio A: B = 4.6: 1) of the reflective material (sample).

Evaluation of light diffusibility was performed on the obtained reflective material.

<Example 1-2>

In the production of the resin composition A of the example 1-1, the amorphous cycloolefin resin A (granules of the product name "ZEONOR RCY151" manufactured by ZEON Co., Ltd., and the amorphous cycloolefin resin) The mass ratio of the particles of B (manufactured by Japan ZEON Co., Ltd., trade name "ZEONOR 1060R") and the polypropylene resin (manufactured by Nippon Polypropylene Co., Ltd., trade name "NOVATEC PP EA9") was 70: A reflective material (sample) having a thickness of 225 μm was obtained in the same manner as in Example 1.1 except for 10:20. The same evaluation as in Example 1-1 was carried out on the obtained reflective material.

<Example 1-3>

In the production of the resin composition A of the example 1-1, except for the particles of the amorphous cycloolefin resin A (manufactured by ZEON Co., Ltd., trade name "ZEONOR RCY15"), and the polypropylene resin (Japan poly Granules of the propylene-based company, trade name "NOVATEC PP EA9", and amorphous cycloolefin resin C (manufactured by Topas Advanced Polymers GmbH, trade name "TOPAS 8007F", density (ISO1183): 1.01 g/cm ³ , MVR (260 ° C, 2.16 kg, ISO1133): 32ml/10min, glass transfer temperature Tg (DSC, ISO11375-1, 2, 3): 78 ° C, SP value 8.8) particles, according to the mass ratio of 60:20:20 A reflection material (sample) having a thickness of 225 μm was obtained in the same manner as in Example 1-1 except that mixing was carried out. The same evaluation as in Example 1-1 was performed on the obtained reflective material.

<Comparative Example 1-1>

In the production of the resin composition A of the example 1-1, except for the particles of the amorphous cycloolefin resin A (manufactured by ZEON Co., Ltd., trade name "ZEONOR RCY15"), and the polypropylene resin (Japan poly Made by Propylene Co., Ltd., trade name "NOVATEC PP A 225 μm-thick reflective material (sample) was obtained in the same manner as in Example 1-1 except that the particles of EA9" were mixed at a mass ratio of 60:40. The same evaluation as in Example 1-1 was performed on the obtained reflective material.

<Comparative Example 1-2>

In the production of the resin composition A of the example 1-1, except for the particles of the amorphous cycloolefin resin A (manufactured by ZEON Co., Ltd., trade name "ZEONOR RCY15"), and the polypropylene resin (Japan poly A pellet (thickness) having a thickness of 225 μm was obtained in the same manner as in Example 1-1 except that the pellets of the product "NOVATEC PP EA9" were mixed at a mass ratio of 70:30. The same evaluation as in Example 1-1 was performed on the obtained reflective material.

Table 2 shows the blending tables of Examples 1-1 to 1-3 and Comparative Examples 1-1 to 1-2. In addition, for the COP phase of the marine phase, the apparent viscosity was adjusted by blending the two types, and the influence on the surface angle due to the difference in apparent viscosity was confirmed.

Table 3 shows the SP values and the absolute values of the difference between the two or more thermoplastic resin mixing systems in Examples 1-1 to 1-3 and Comparative Examples 1-1 to 1-2.

Table 4 shows the apparent viscosity and the absolute value of the difference between the two or more thermoplastic resin mixing systems in Examples 1-1 to 1-3 and Comparative Examples 1-1 to 1-2.

Tables 5 show the evaluation results of the surface angle and the reflected light diffusion for Examples 1-1 to 1-3 and Comparative Examples 1-1 to 1-2.

The following items are known from Tables 2 to 5.

(1) The larger the surface angle standard deviation (σ, δ(n)) of the resin layer (A), the more the light diffusibility is exhibited, especially by the standard deviation of the surface angle (σ, δ(n)). When it is set to 8.0 or more, sufficient light diffusibility can be exhibited.

(2) The larger the SP value difference between the marine phase (the COP phase in the embodiment) and the island phase, the more the standard deviation (σ, δ(n)) of the surface angle can be increased, especially by the marine phase and the island. When the maximum SP value difference of the phase is set to 1.4 or more, the standard deviation of the surface angle (σ, δ(n)) of the resin layer (A) can be made 8.0°. the above.

(3) The smaller the absolute value of the apparent viscosity difference between the marine phase and the island phase, the more the standard deviation (σ, δ(n)) of the surface angle can be increased. For example, when the absolute value of the maximum SP value of the marine-island phase is 0.8, the absolute value of the apparent viscosity difference between the sea phase (the COP phase in the embodiment) and the island phase by the sea-island structure: |η(Pa .s)|After 1000 (Pa.s) or less, the standard deviation (σ, δ(n)) of the surface angle of the resin layer (A) can be made 8.0 or more.

(4) As a result of reviewing Example 1-2, the smaller the blending amount of the island phase, the more the standard deviation (σ, δ(n)) of the surface angle can be increased, and the light diffusibility can be increased.

<Measurement and evaluation method>

Next, the measurement methods and evaluation methods of various physical property values of the samples obtained in Examples 2-1 to 2-3, Comparative Example 2-1, and Reference Examples 2-1 to 2-2 will be described. Hereinafter, the direction of the traction (flow) of the film is referred to as "MD", and the direction of the orthogonal direction is referred to as "TD".

(three-dimensional surface roughness)

The surface (resin layer A) of the reflective material (sample) was observed by the following apparatus and conditions, and the obtained image was analyzed, and the surface average roughness (hereinafter referred to as "Sa") and the maximum height (hereinafter referred to as "Sz" were calculated. "). In addition, the calculation is based on JIS B0601:2001.

Device: Electron beam three-dimensional roughness analysis device "ERA-4000" (manufactured by ELIONIX)

Evaporation conditions: 10 mA × 100 sec, Pt-Pd evaporation

Acceleration voltage: 10kV

Observation magnification: 250 times

Analysis area: 360 (μm) × 480 (μm)

(flexure stiffness)

According to JIS P-8125, the flexural rigidity (g.cm) was measured in accordance with the following conditions.

Measuring device: friction fastness test device (Daeong Scientific Seiki Manufacturing Co., Ltd.)

Bending angle: 15 degrees

(apparent viscosity)

The apparent viscosity of the reflective material (sample) was measured in accordance with the apparatus and conditions described below.

Measuring device: High-pressure flow testing machine (CFT-500C/Shimadzu Corporation)

Measuring conditions: nozzle 1×L10mm

Temperature: 230 (°C)

Cutting speed: 100 (1/sec)

(light guide plate close to the spot)

The reflective material produced in the examples was sequentially removed from the internal reflective material of the display described below, and the light guide plate adhesion spot was measured in accordance with the method shown below.

The display was placed on a horizontal measuring platform, and four hammers of 500 g weight were placed in total at four corners of the display, and the light source was turned on while a certain load was applied. Using a luminance spectrometer (manufactured by CA2000, KONIKA MINOLTA Co., Ltd.), the standard deviation and the (maximum) value of the luminance (average value) were calculated from the dot matrix data of the display luminance, and used as an indicator of the luminance spot.

"Monitor used"

Model name: LCD-8000V (CENTURY)

Light source: LED (long side × 1 column configuration)

Size: 8吋

<Example 2-1>

(Production of Resin Composition A of Resin Layer (A))

Amorphous cycloolefin-based resin A (manufactured by ZEON Co., Ltd., trade name "ZEONOR RCY15", hydrogenated product of ring-opening polymer of cyclic olefin, density (ISO1183): 1.01 g/cm ³ , MFR (230) °C, 21.18N, JIS K7210: 1.2g/10min, glass transition temperature Tg (JIS K7121): 127 ° C, SP value: 7.4), and amorphous cycloolefin resin B (made by Japan ZEON Co., Ltd., Product name "ZEONOR 1060R", hydride of ring-opening polymer of cyclic olefin, density (ISO1183): 1.01g/cm ³ , MFR (230°C, 21.18N, JIS K7210): 12g/10min, glass transition temperature Tg (JIS K7121): pellets at 100 ° C, SP value: 7.4), and polypropylene resin (manufactured by Nippon Polypropylene Co., Ltd., trade name "NOVATEC PP EA9", density (JIS K7112): 0.9 g/cm ³ , MFR (230 ° C, 21.18 N, JIS K-7210): 0.5 g/10 min, SP value: 8.0), after mixing at a mass ratio of 50:25:25, a twin screw extruder heated to 230 ° C was used. The granulation was carried out to obtain a resin composition A.

(Production of Resin Composition B of Resin Layer (B))

Polypropylene resin (manufactured by Nippon Polypropylene Co., Ltd., trade name "NOVATEC PP FY6HA", density (JIS K7112): 0.9 g/cm ³ , MFR (230 ° C, 21.18 N, JIS K-7210): 2.4 g/ 10 min) of granules and titanium oxide (manufactured by KRONOS, trade name "KRONOS 2230", density 4.2 g/cm ³ , rutile-type titanium oxide, Al, Si surface treatment, TiO ₂ content: 96.0%, production method: chlorination The mixture was subjected to granulation at a mass ratio of 50:50, and granulation was carried out using a twin-screw extruder heated to 270 ° C to obtain a resin composition B.

(production of reflective material)

The resin compositions A and B were respectively supplied to extruders A and B heated to 230 ° C and 200 ° C, and melt-kneaded at 230 ° C and 200 ° C in each extruder, and then combined into two types. The three-layer T-die is extruded in a sheet form in a three-layer structure in which the resin layer (A)/resin layer (B)/resin layer (A) is formed, and is solidified by cooling to form a laminated sheet.

The obtained laminated sheet was stretched by 2.5 times to the MD at a temperature of 135 ° C, and further stretched by 2.5 times at 140 ° C toward the TD, thereby performing biaxial stretching to obtain a thickness of 225 μm (resin layer (A): 185 μm, resin layer (B): 20 μm laminate ratio A: B = 4.6: 1) of the reflective material (sample).

The evaluation of the three-dimensional surface roughness (surface average roughness: Sa, maximum height: Sz) and the light guide plate adhesion luminance spot were performed for the obtained reflective material.

<Example 2-2>

In the production of the resin composition A of Example 2-1, except for the particles of the amorphous cycloolefin resin A (manufactured by ZEON Co., Ltd., trade name "ZEONOR RCY15"), and the polypropylene resin (Japan Poly Granules of the propylene-based company, trade name "NOVATEC PP EA9", and amorphous cycloolefin resin C (manufactured by Topas Advanced Polymers GmbH, trade name "TOPAS8007F", density (ISO1183): 1.01 g/cm ³ , MVR (260 ° C, 2.16 kg, ISO 1133): 32 ml/10 min, glass transition temperature Tg (DSC, ISO 11375-1, 2, 3): 78 ° C, SP value 8.8) mass ratio of the particles, set to 70:15: A reflective material (sample) having a thickness of 225 μm was obtained in the same manner as in Example 2-1 except for the same. The same evaluation as in Example 2-1 was performed on the obtained reflective material.

<Example 2-3>

In the production of the resin composition A of the example 2-1, the particles of the amorphous cycloolefin resin A (manufactured by ZEON Co., Ltd., trade name "ZEONOR RCY15") and the amorphous cycloolefin system are used. The pellets of the resin C ("TOPAS 8007F") and the pellets of the polypropylene resin (manufactured by Nippon Polypropylene Co., Ltd., trade name "NOVATEC PP EA9") were mixed at a mass ratio of 60:20:20, and the others were mixed. A reflective material (sample) having a thickness of 225 μm was obtained in the same manner as in Example 2-1. The same evaluation and flexural rigidity evaluation as in Example 2-1 were carried out for the obtained reflective material.

<Comparative Example 2-1>

In the production of the resin composition A of Example 2-1, except for the particles of the amorphous cycloolefin resin A (manufactured by ZEON Co., Ltd., trade name "ZEONOR RCY15"), and the polypropylene resin (Japan Poly A pellet (sample) having a thickness of 225 μm was obtained in the same manner as in Example 2-1 except that the pellets of the product "NOVATEC PP EA9" were mixed at a mass ratio of 60:40. The same evaluation as in Example 2-1 was performed on the obtained reflective material.

<Reference Example 2-1>

In the production of the reflective material of Example 2-3, except that the thickness of the sheet was set to 300 μm (resin layer (A): 185 μm, resin layer (B): 20 μm layer ratio A: B = 4.6: 1), A reflective material (sample) was obtained in the same manner as in Example 2-3. The same evaluation as in Example 2-3 was performed on the obtained reflective material.

<Reference Example 2-2>

In the production of the resin composition A of the example 2-1, except for the particles of the amorphous cycloolefin resin C (manufactured by ZEON Co., Ltd., trade name "ZEONOR RCY50", SP value: 7.4), The particles of the crystalline cycloolefin resin B (manufactured by Nippon Zeon Co., Ltd., trade name "ZEONOR 1060R", SP value: 7.4) were mixed in a ratio of 67:33 by mass, and the same as in Example 2-1. A reflective material (sample) having a thickness of 225 μm was obtained. Evaluation of the 3-dimensional surface roughness was performed on the obtained reflective material.

Table 6 shows the formulations of Examples 2-1 to 2-3 and Comparative Example 2-1. In addition, for the COP phase of the marine phase, the apparent viscosity is adjusted by blending the two varieties, and the cause table is confirmed. The effect of the difference in viscosity on the surface roughness of the 3 dimensional element.

In Tables 2-1 to 2-3 and Comparative Example 2-1, the SP values and the absolute values of the difference in the two or more thermoplastic resin mixing systems are shown in Table 7.

Table 8 shows the apparent viscosity and the absolute value of the difference between the two or more thermoplastic resin mixing systems in Examples 2-1 to 2-3 and Comparative Example 2-1.

Table 9 shows the evaluation results of the surface roughness and the light guide plate adhesion luminance spot for Examples 2-1 to 2-3, Comparative Example 2-1, and Reference Example 2-1 to 2-2. The judgment of whether or not the light guide plate is closely connected to the luminance spot is determined by setting the range of the luminance (maximum value) / (average value) not exceeding 2.0 as a pass. In addition, for the standard deviation of the luminance, the smaller the presentation, the less the luminance spot.

Further, Reference Example 2-2 is not a hybrid system of two or more kinds of thermoplastic resins, and is an example in which the absolute value of the SP value is 0.

The following items are known from Tables 6 to 9.

(1) The higher the surface average roughness, the more the light-shielding plate can be prevented from adhering to the luminance spot, and by setting the surface average roughness (Sa) value of the resin layer (A) to 0.90 or more, the light-shielding plate can be sufficiently suppressed. .

(2) The larger the SP value difference between the marine phase (the COP phase in Examples 2-1 to 2-3) and the island phase, the more the surface average roughness (Sa) can be increased, especially by the marine phase When the difference in the maximum SP value of the island phase is 1.4 or more, the surface average roughness (Sa) of the resin layer (A) can be made 0.90 or more.

(3) The smaller the absolute value of the apparent viscosity difference between the marine phase and the island phase, the more the surface average roughness (Sa) can be increased. For example, when the absolute value of the maximum SP value of the marine-island phase is 0.8, the apparent viscosity difference between the sea phase by the sea-island structure (the COP phase in Examples 2-1 to 2-3) and the island phase is Absolute value: | η (Pa.s)| Below 1000 (Pa.s), the surface average roughness (Sa) of the resin layer (A) can be made 0.90 or more.

(4) In comparison with Example 2-3 and Reference Example 2-1, even if the same material is used, the higher the flexural rigidity (the rigidity of the sheet itself), the more the light guide plate can be prevented from adhering to the luminance spot.

(5) The higher the rigidity of the sheet itself, the less likely the deformation of the reflecting material to follow the deformation of the light guide plate occurs, and the judgment is made because the adhesion can be suppressed.

Claims (15)

A reflective material having a resin layer (A) as an outermost layer having a reflective use surface, the resin layer (A) having a standard deviation of surface angles (σ, δ(n) calculated from a height distribution as shown below) a diffuse reflection surface of 8.0° or more; the height distribution is a dispersion indicating the height of the section of an arbitrary line segment of the measurement area, and when the height from the reference plane is Zn with respect to the position (Xn, Yn), (Xn, Yn, Zn) is a set representation; (Xn, Yn) satisfies the following formula: dx = X _n+1 - X _n = a certain value, dy = Y _{n+1 -} Y _n = a certain value (n) is the value calculated from the height distribution and is obtained according to the following equation: δ(n)=arctan(Z'(n))*180/π Z'(n)=(Z _n+1 -Z _n ) /(dx ² +dy ² ) ^0.5 However, dx ² +dy ² ≠0. The reflective material according to the first aspect of the invention, wherein the resin layer (A) is formed of a coating layer having a concavo-convex structure without organic or inorganic spherical fine particles, but has a surface average of three-dimensional surface roughness. A layer having a surface roughness of (Sa) of 0.90 μm or more. The reflective material according to claim 1 or 2, wherein the resin layer (A) is composed of two or more thermoplastic resins, and the solubility parameter (SP value) of the two or more thermoplastic resins is poor. The absolute value is 0.3~3.0 (cal/cm ³ ) ^0.5 . The reflective material according to claim 1 or 2, wherein the resin layer (A) has a sea-island structure in which two or more thermoplastic resins are mixed, and the SP value difference between the sea phase and the island phase is absolutely Value (however, if the island phase is composed of a complex phase, the absolute value of the maximum SP value difference between the ocean phase and the island phase) is 1.4 (cal/cm ³ ) ^0.5 or more, or the SP value difference between the ocean phase and the island phase. It is 0.6 (cal/cm ³ ) ^0.5 or more and less than 1.4, and the absolute value of the apparent viscosity difference between the sea phase and the island phase is 1000 (Pa.s) or less. The reflective material of the third aspect of the invention, wherein the two or more thermoplastic resins are 70% by mass or more of the entire resin constituting the resin layer (A). The reflective material according to the first or second aspect of the invention, wherein at least one of the two or more types of thermoplastic resins constituting the resin layer (A) has a glass transition temperature (JIS K7121) of 85 to 150 ° C Resin. The reflective material according to item 6 of the patent application, wherein the amorphous resin is a cycloolefin system Resin. In the reflective material according to the first or second aspect of the invention, the resin layer (B) having a void inside is provided in addition to the resin layer (A). The reflective material according to claim 8, wherein the resin layer (B) contains a fine powder filler. The reflective material according to the eighth aspect of the invention, wherein the resin layer (B) has a porosity of 20% or more and 70% or less. The reflective material according to the eighth aspect of the invention, wherein the resin layer (B) contains an olefin resin. The reflective material according to item 8 of the patent application, wherein the total thickness ratio of each of the resin layer (A) and the resin layer (B) is (A): (B) = 1:3 to 1:15. A liquid crystal display using the reflective material of any one of claims 1 to 12. A lighting fixture using the reflective material of any one of claims 1 to 12. A illuminating kanban is a reflective material according to any one of claims 1 to 12.