JP2012163905A - Light-shielding film with photochromic function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-shielding film with a photochromic function having a visibility at night with little ultraviolet light, controlling a light illumination range at night, allowing a partial illumination, and capable of exerting sufficient light shielding effects at locations with much ultraviolet light.SOLUTION: The light-shielding film with the photochromic function includes: a louver layer 110; a transparent protective layer 120 that is superposed on one surface of the louver layer 110 and stuck thereto via an adhesive layer 130; and a pressure-sensitive adhesive layer 140 formed on the other surface of the louver layer 110. The louver layer 110, the transparent protective layer 120, the adhesive layer 130, and the pressure-sensitive adhesive layer 140 have flexibility and film-like shape respectively. The louver layer 110 is formed by alternately superposing light-shielding belts 111 including a plurality of photochromic pigments, and a plurality of light transmission belts 112, and joining surfaces of the light-shielding belts 111 and the light transmission belts 112 are disposed so as to be perpendicular to the surface of the louver layer 110 and parallel to each other at equal intervals.

Description

  The present invention relates to a light shielding film. More specifically, the present invention relates to a light control film applied to displays such as ATMs, lighting fixtures, digital home appliances, and in-vehicle applications.

  When operating information display bodies such as mobile phone, mobile information terminal, encryption number input terminal such as card, etc., in order to view information, unnecessary external light such as sunlight and fluorescent lamps is blocked and contrast is improved. Or adjust the range of the visible angle.

  On the other hand, a method is disclosed in which a peep prevention body including an antiglare layer formed by alternately stacking and integrating transparent silicone rubber sheets and colored silicone rubber sheets is attached to an information display body (for example, , See Patent Document 1).

  Further, in a filter for a display device, a resin containing a photochromic dye such as a photochromic dye forms a layer in a transparent substrate for shielding external ambient light, and the color changing dye is predetermined. There has been proposed a method using an external light shielding film that irreversibly discolors the pattern to form an external light shielding pattern (see, for example, Patent Document 2).

JP 2003-131202 A JP 2009-98695 A

  However, in the peep prevention body disclosed in Patent Document 1, the color is fixed if the constituent material of the colored silicone rubber used in the antiglare layer is determined, and proposed in Patent Document 2. Even in the external light shielding film, since the photochromic dye does not change color and does not return to the original color, when the external light environment fluctuates greatly, the problem that the external light blocking effect does not follow the change. There is.

  Therefore, the present invention has been made in view of the above problems, and (i) has visibility at night when there is little ultraviolet light, and (b) enables the illumination range of light to be controlled or partial illumination at night. An object of the present invention is to provide a light-shielding film with a photochromic function capable of exhibiting a sufficient light-shielding effect in a place where there is a lot of ultraviolet rays.

  Such an object is achieved by the present inventions (1) to (9) below.

  (1) It has a louver layer in which light transmission bands and light shielding bands are alternately arranged, and a transparent protective layer bonded to at least one surface of the louver layer, and the light shielding band is a black or colored resin, and photochromic A light-shielding film with a photochromic function, comprising a pigment.

  (2) The louver layer is composed of two layers, a first louver layer and a second louver layer, and the louver layer includes the first louver layer and the second louver layer in the direction of the light transmission band and the light shielding band of the first louver layer. Are laminated so as to be orthogonal to the direction of the light transmission band and the light shielding band of the second louver layer, The light shielding film with a photochromic function according to (1).

  (3) The black or colored resin of the light shielding band is a black or dark color thermosetting silicone resin or thermosetting polyurethane resin, wherein the light shielding film with a photochromic function according to (1) or (2) .

  (4) The photochromic material is one or more selected from the group consisting of a spirolane compound, a spirooxazine compound, a diarylethene compound, a fluoride compound, and a hexaarylbisimidazole compound (1 ) To (3) A light-shielding film with a photochromic function.

  (5) The light transmission band is a transparent thermosetting silicone resin or thermosetting polyurethane resin, wherein the light-shielding film with a photochromic function according to any one of (1) to (4).

  (6) Any of (1) to (5), wherein the light transmission band and the light shielding band include one or more of a stabilizer, an antioxidant, an antistatic agent, and a plasticizer. The light-shielding film with a photochromic function as described in 1.

  (7) The light-shielding film with a photochromic function according to any one of (1) to (6), wherein the transparent protective layer is an ultraviolet transparent transparent resin film made of an acrylic resin or a polyethylene terephthalate resin.

  (8) The light-shielding band includes 3 to 50% by mass of a photochromic dye, The light-shielding film with a photochromic function according to any one of (1) to (7).

  (9) The louver layer, or the first louver layer and the second louver layer are formed with a thickness of 0.15 to 0.25 mm, a transparency of 70% or more, and a visible angle of 30 ° to 120 °. Is formed to 40 to 260 μm, the width of the light shielding band is formed to 10 to 50 μm, and the thickness of the transparent protective layer is set to 0.1 to 0.5 mm according to any one of (1) to (8). Light shielding film with photochromic function.

  According to the present invention, (i) visibility at night with less ultraviolet rays, (b) control of the illumination range of light at night and partial illumination are possible, It is possible to provide a light-shielding film with a photochromic function that can exhibit a good light-shielding effect.

It is a perspective view which shows the structure of the light shielding film with a photochromic function which concerns on Example 1 of this invention. It is AA arrow sectional drawing of FIG. It is sectional drawing which shows the structure of the light shielding film with a photochromic function which concerns on Example 2 of this invention. It is a perspective view which shows the structure of the light shielding film with a photochromic function which concerns on Example 3 of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings.

(First embodiment)
1 is a perspective view of a light-shielding film with a photochromic function of Example 1 according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG.

  As shown in FIGS. 1 and 2, the light-shielding film 1 with a photochromic function in the first embodiment of the present invention is a louver layer 110 and a transparent protective layer laminated on one surface of the louver layer 110 and adhered by an adhesive layer 130. The layer 120 and the adhesive layer 140 formed on the other surface of the louver layer 110 are provided. The louver layer 110, the transparent protective layer 120, the adhesive layer 130, and the adhesive layer 140 are each made of a flexible film or sheet, and the louver layer 110 includes a plurality of light shielding bands 111 and a plurality of light transmission bands 112. Are alternately stacked in the horizontal direction, and the joint surfaces of the light shielding band 111 and the light transmission band 112 are arranged at equal intervals so as to be perpendicular to the surface of the louver layer 110 and parallel to each other. The light-shielding film 1 with a photochromic function is detachably adhered to a display (not shown) such as an ATM, a lighting fixture, a digital home appliance, or an in-vehicle application by the adhesive layer 140.

  The light shielding band 111 includes at least a black or colored resin and a photochromic dye.

  As the black or colored resin contained in the light shielding band 111, a black or dark color thermosetting silicone resin or thermosetting polyurethane resin can be used.

  Black or dark thermosetting silicone resin or thermosetting polyurethane resin is obtained by adding black or dark pigment or dye such as carbon black to transparent thermosetting silicone resin composition or thermosetting polyurethane resin composition. Or it can be set as the dark shading resin.

  In general, a photochromic dye changes its color when it receives light of a specific wavelength, and returns to its original color when it does not receive light of a specific wavelength for a certain period of time. As the photochromic dye contained in the shading band 111, one or more selected from a spirolane compound, a spirooxazine compound, a diarylethene compound, a fluoride compound, a hexaarylbisimidazole compound, etc. whose color is changed by ultraviolet rays are used. can do.

The light shielding band 111 preferably contains 3 to 50% by mass of a photochromic dye. When the content of the photochromic dye is less than 3% by mass, the discoloration effect due to ultraviolet rays becomes weak, and when the content of the photochromic dye exceeds 50% by mass,
The thermosetting silicone resin or the thermosetting polyurethane resin cannot fix the photochromic dye.

  As the resin of the light transmission band 112, a transparent, thermosetting silicone resin or thermosetting polyurethane resin can be used, but it was used for the light shielding band 111 in terms of adhesion at the interface with the light shielding band 111. A resin having the same quality as the resin is preferred.

  The width of the light transmission band 112 (W1 in FIG. 2) and the width of the light shielding band 111 (W2 in FIG. 2) are determined by the ratio of W1 / W2 in transparency and parallel light transmittance, and the range of the visible angle θ. Is selected in consideration of the refractive index and width of the light transmission band 112 and the thickness of the louver layer 110 (t in FIG. 2). Specifically, the thickness t of the louver layer is 0.15 to 0.25 mm, and the width W1 of the light transmission band 112 is 40 to 260 μm. Further, the width W2 of the light shielding band 111 is 10 to 50 μm, preferably 10 to 30 μm, so as not to adversely affect human vision. When t, W1, and W2 are numerical values, the visible angle θ is set to 30 ° to 120 °, and a black or dark resin and a transparent resin are appropriately selected, so that no ultraviolet rays are incident on the louver layer 110, The louver layer 110 can be formed with transparency and a parallel light transmittance of 70% or more.

  When ultraviolet rays are incident on the louver layer 110 from the outside light environment, the photochromic dye contained in the light shielding band 111 is efficiently discolored according to the intensity of the ultraviolet rays, and the degree of light absorption changes, so the contrast of the image on the display changes. Without being kept in good condition.

  The transparent protective layer 120 is made of acrylic resin or polyethylene terephthalate resin having a thickness of about 0.1 to 0.5 mm, preferably about 0.1 to 0.3 mm, more preferably about 0.1 to 0.2 mm. A highly transparent resin film having a UV transmittance of 65% or more is used. With such a material and thickness, a sheet or film excellent in physical strength such as tensile strength and tear strength can be obtained. Moreover, by integrating with the louver layer 110, secondary workability such as punching is also improved.

  The louver layer 110 and the transparent protective layer 120 are bonded via an adhesive layer 130.

  The adhesive layer 130 is made of a transparent adhesive such as a silicone mold containing a primer, and is printed and applied to the adhesive surface of the louver layer 110 or the adhesive surface of the transparent protective layer 120 with a thickness of 10 to 30 μm.

  The adhesive layer 140 is made of, for example, a transparent silicone rubber sheet, and is vulcanized and bonded to the surface (the lower surface in FIG. 2) opposite to the surface to which the transparent protective layer 120 of the louver layer 110 is bonded. The translucent adhesive layer 140 has a thickness of 10 to 10 using a calender roll or the like on a mirror-finished PET film, for example, because the adhesive surface to be adhered to the display is desirably a translucent adhesive surface. Coated to 30 μm, transferred to the lower surface of the louver layer 110 and vulcanized and bonded, and then the PET film is peeled off to be integrated with the lower surface of the louver layer 110. The adhesive strength (JIS K 6256) of the information display body of the adhesive layer 140 to the liquid crystal display is selected from 0.30 to 0.80 N / 25 mm, preferably 0.30 to 0.50 N / 25 mm. Further, the specular glossiness (glossiness at an incident angle of 60 ° in JIS Z 8741) on the translucent adhesive surface of the adhesive layer 140 is selected to be 120% or more.

  According to the above configuration, when the light-shielding film with photochromic function 1 is adhered to the display, in a bright room environment, the photochromic dye is colored following the intensity of sunlight, fluorescent light, etc., so unnecessary external light is blocked. Thus, the contrast can be improved, or the photochromic dye is transparent in a dark room environment where there is no outside light such as at night, so the display contrast of the display is not impaired. Therefore, good visibility can be effectively secured without covering the display with a hand, tilting the light-shielding film 1 with photochromic function, or changing the direction of the light-shielding film 1 with photochromic function. It is possible to greatly improve the performance. Since the louver layer 110 of the light-shielding film 1 with a photochromic function exhibits a light-shielding effect, a third party can look into various information displayed on the display from the side at an angle larger than the visible angle by setting an appropriate visible angle. It becomes impossible or extremely difficult to read. Therefore, information can be comprehended and transmitted without worrying about leakage of information to third parties and without worrying about peeping.

  (Second Embodiment)

  FIG. 4: is a perspective view of the light shielding film with a photochromic function of Example 3 which concerns on 2nd Embodiment of this invention.

  As shown in FIG. 4, in the second embodiment of the present invention, the basic configuration is the same as that of the first embodiment except that the louver layer 310 includes a first louver layer 310a and a second louver layer 310b. It is.

  In the louver layer 310, the first louver layer and the second louver layer are arranged such that the light shielding band 311a and the light transmission band 312a of the first louver layer are orthogonal to the light shielding band 311b and the light transmission band 312b of the second louver layer. And are bonded through an adhesive layer 330b.

The dimensions and configurations of the light shielding band 311a and the light transmission band 312a of the first louver layer and the light shielding band 311b and the light transmission band 312b of the second louver layer are respectively the light shielding bands of the first louver layer of the first embodiment in FIG. 111 and light transmission band 112, but
By setting the visible angle of the first louver layer and the visible angle of the second louver layer to be different, the visible angle in the vertical direction and the horizontal direction can be changed according to the purpose of the display.

Example 1
1 is a perspective view of a light-shielding film with a photochromic function of Example 1, and FIG. 2 is a cross-sectional view taken along line AA in FIG.

First, in a 0.20 mm thick highly transparent film made of silicone rubber compound KE-581U (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), a plurality of parallel linear grooves 30 μm wide are separated by 120 μm in the thickness direction. It formed so that it might penetrate. Next, a silicone rubber compound KE-981U (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) is mixed with carbon black as a black substance and pseudogem-Bis (3, 3, a kind of hexaarylbisimidazole compound as a photochromic dye). 3 ′, 4,4′-tetramethoxydiphenylimidazole) [2.2]
paracyclophane (2) (trade name, manufactured by Kanto Chemical Co., Inc.) was added and kneaded uniformly to obtain a black resin with a light-shielding band, which was filled in the groove.

  Next, the highly transparent silicone resin film filled with the black resin in the groove is heated, vulcanized, and cured, and the light shielding layers 111 and the light transmission layers 112 of FIGS. A 0.2 mm louver layer 110 was produced. The louver layer 110 is a silicone rubber film having a visible parallel light transmittance of 80% or more and a visible angle of 60 °.

  Next, a silicone adhesive layer 130 made of liquid silicone rubber KE-1934A / B (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) and primer AP-1 (product name, manufactured by Shin-Etsu Chemical Co., Ltd.) is formed on one surface of the louver layer 110. Is applied to a thickness of about 30 μm using a screen printer, and an ultraviolet ray made of acrylic resin acrylite # 000 (trade name, manufactured by Mitsubishi Rayon Co., Ltd.) having a thickness of 0.2 mm is applied to the silicone adhesive layer 130. A transparent and highly transparent transparent protective layer 120 was integrally bonded.

Then, liquid silicone rubber KE-1934A / B (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) is applied on the mirror side of the polyethylene terephthalate (PET) film to a thickness of about 30 μm using a screen printer, and the louver layer 110 Then, the pressure-sensitive adhesive layer 140 was heat-vulcanized and bonded to the other surface, and then the PET film was peeled off to form a mirror-like light-transmitting pressure-sensitive adhesive surface, thereby preparing the light-shielding film 1 with a photochromic function. The specular glossiness (glossiness at an incident angle of 60 ° in JIS Z 8741) of this silicone rubber, that is, the translucent adhesive surface of the adhesive layer 140 was 140%.

  When the light-shielding film 1 with a photochromic function is obtained in this way, it is cut according to the size of the liquid crystal display of the in-vehicle navigator, and is adhered to the liquid crystal display so that the direction of the light-shielding band 111 and the light transmission band 112 is vertical. Information was displayed on the LCD. When the information was displayed on the liquid crystal display, the information displayed on the liquid crystal display could not be grasped only from the side of the liquid crystal display, which looked black at about 35 °. On the other hand, the information displayed on the liquid crystal display can be grasped very easily and clearly from the front of the liquid crystal display. This liquid crystal display has the same good visibility whether the sunlight is shining in the daylight in a bright room environment and the liquid crystal display is irradiated with ultraviolet light, or when there is no outside light in the dark room environment at night. It was done.

(Example 2)
3 is a partial side view of the light-shielding film with a photochromic function of Example 2. FIG.

  In Example 2, in place of the adhesive layer 140 of Example 1 in FIG. 2, as shown in FIG. 3, the adhesive layer 230b, the transparent protective layer 220b, and the adhesive layer 240 are disposed, as in Example 1. It is the same.

  The louver layer 210 in Example 2 is the same as the louver layer 110 in Example 1, and the transparent protective layers 220a and 220b in Example 2 are the same as the transparent protective layer 120 in Example 1, and in Example 2. The adhesive layers 230a and 230b are the same as the adhesive layer 130 of Example 1, and the adhesive layer 240 in Example 2 is the same as the adhesive layer 140 of Example 1.

  In the case of Example 1, there is a possibility that air enters between the liquid crystal display surface and the adhesive layer 140 and the light shielding property of the light shielding layer 111 of the louver layer 110 does not sufficiently work. On the other hand, when the transparent protective layer 220b is interposed between the adhesive layer 240 and the louver layer 210 as in Example 2, the adhesive operation of the light-shielding film 2 with a photochromic function to the liquid crystal display surface is facilitated. The fear is eliminated.

(Example 3)
4 is a perspective view of a light-shielding film with a photochromic function of Example 3. FIG.

  In the third embodiment, the louver layer 110 of FIG. 2 of the first embodiment is a louver layer 310 composed of two layers of a first louver layer 310a and a second louver layer 310b as shown in FIG. Example 3 is the same as Example 1 except that the thickness of 310a and the thickness of the second louver layer 310b are both 0.2 mm.

In the first louver layer 310a and the second louver layer 310b in Example 3, the light shielding band 311a and the light transmission layer 312a of the first louver layer 310a are orthogonal to the light shielding band 311b and the light transmission layer 312b of the second louver layer 310b. Are arranged as follows.
The dimensions and configuration of the first louver layer 310a and the second louver layer 310b in the third embodiment are the same as those of the louver layer 110 in FIG.

  The transparent protective layer 320 in Example 3 is the same as the transparent protective layer 120 in Example 1, and the adhesive layers 330a and 330b in Example 3 are the same as the adhesive layer 130 in Example 1. The adhesive layer 340 is the same as the adhesive layer 140 of Example 1.

  After obtaining the light-shielding film 3 with a photochromic function in this way, it is cut according to the size of the liquid crystal display of the in-vehicle navigator, and the direction of the light-shielding band 311a and the light transmission band 312a of the first louver layer 310a is the vertical direction. Adhering to the liquid crystal display, the information was displayed on the liquid crystal display. In this case, the light shielding band 311b and the light transmission band 312b of the second louver layer 310b face in the horizontal direction on the left and right. When information was displayed on the liquid crystal display, the information displayed on the liquid crystal display could not be grasped from only about 35 ° in the vertical direction and about 35 ° in the horizontal direction. On the other hand, the information displayed on the liquid crystal display can be grasped very easily and clearly from the front of the liquid crystal display. This liquid crystal display has the same good visibility whether the sunlight is shining in the daylight in a bright room environment and the liquid crystal display is irradiated with ultraviolet light, or when there is no outside light in the dark room environment at night. It was done.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

1, 2, 3 Light shielding film with photochromic function 110 Louver layer 111 Light shielding band 112 Light transmission band 120 Transparent protective layer 130 Adhesive layer 140 Adhesive layer 210 Louver layer 211 Light shielding band 212 Light transmission bands 220a and 220b Transparent protective layers 230a and 230b Adhesion Layer 240 adhesive layer 310 louver layer 310a first louver layer 310b second louver layer 311a, 311b light shielding bands 312a, 312b light transmission band 320 transparent protective layers 330a, 330b adhesive layer 340 adhesive layer

Claims (9)

A louver layer in which light transmission bands and light shielding bands are alternately arranged;
A transparent protective layer adhered to at least one surface of the louver layer,
The light-shielding film with a photochromic function, wherein the light-shielding band contains black or colored resin and a photochromic dye. The louver layer is composed of two layers, a first louver layer and a second louver layer,
The louver layer includes the first louver layer and the second louver layer, wherein the light transmission band and the light shielding band of the first louver layer are oriented in the direction of the light transmission band and the light shielding band of the second louver layer. The light-shielding film with a photochromic function according to claim 1, wherein the light-shielding film is laminated so as to be orthogonal to the direction of the film.   The light-shielding film with a photochromic function according to claim 1 or 2, wherein the black or colored resin of the light-shielding band is a black or dark-colored thermosetting silicone resin or thermosetting polyurethane resin.   The photochromic material is one or more selected from the group consisting of a spirolane compound, a spirooxazine compound, a diarylethene compound, a fluoride compound, and a hexaarylbisimidazole compound. 4. The light-shielding film with a photochromic function according to any one of 3 above.   5. The light-shielding film with a photochromic function according to claim 1, wherein the light transmission band is a transparent thermosetting silicone resin or a thermosetting polyurethane resin.   The said light transmission zone and the said light-shielding zone contain any one or more of a stabilizer, antioxidant, an antistatic agent, and a plasticizer, The any one of Claims 1-5 characterized by the above-mentioned. The light-shielding film with a photochromic function as described.   The light-shielding film with a photochromic function according to claim 1, wherein the transparent protective layer is an ultraviolet transparent transparent resin film made of an acrylic resin or a polyethylene terephthalate resin.   The light-shielding film with a photochromic function according to any one of claims 1 to 7, wherein the light-shielding band contains 3 to 50% by mass of a photochromic dye. The louver layer, or the first louver layer and the second louver layer are formed with a thickness of 0.15 to 0.25 mm, a transparency of 70% or more, and a visible angle of 30 ° to 120 °. The width of the light-shielding band is formed to 10 to 50 µm, and the thickness of the transparent protective layer is set to 0.1 to 0.5 mm. The light-shielding film with a photochromic function as described in 1.

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