WO2010134586A1 - 封入レンズ型再帰反射シート - Google Patents
封入レンズ型再帰反射シート Download PDFInfo
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- WO2010134586A1 WO2010134586A1 PCT/JP2010/058593 JP2010058593W WO2010134586A1 WO 2010134586 A1 WO2010134586 A1 WO 2010134586A1 JP 2010058593 W JP2010058593 W JP 2010058593W WO 2010134586 A1 WO2010134586 A1 WO 2010134586A1
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- retroreflective sheet
- lens type
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/12—Reflex reflectors
- G02B5/126—Reflex reflectors including curved refracting surface
- G02B5/128—Reflex reflectors including curved refracting surface transparent spheres being embedded in matrix
Definitions
- the present invention relates to an encapsulated lens type retroreflective sheet, specifically, road signs, signs such as construction signs, number plates of vehicles such as automobiles and motorcycles, safety materials such as clothing and lifesaving items, markings such as signs,
- the present invention relates to an encapsulated lens type retroreflective sheet that can have a preferable retroreflective performance for various authentication stickers, reflectors of reflective sensors in visible light, laser light, or infrared light.
- the present invention relates to an encapsulated lens type retroreflective sheet having a higher retroreflective performance than a conventional encapsulated lens type retroreflective sheet.
- retroreflective sheets that reflect incident light toward a light source are well known, such as road signs, signs such as construction signs, license plates of vehicles such as automobiles and motorcycles, clothing, life-saving devices, etc. It is widely used in safety materials, markings on signboards, various authentication stickers, reflective sensors in visible light, laser light or infrared light.
- a capsule lens type retroreflective sheet or an encapsulated lens type retroreflective sheet using a retroreflective element including a micro glass sphere and a specular reflection layer obtained by vacuum-depositing metal (mostly aluminum) is used.
- Sheets are well known.
- capsule lens type retroreflective sheet examples include Mackenzie's Japanese Patent Publication No. 40-7870 (Patent Document 1, corresponding US Pat. No. 3,190,178), No. -110592 (Patent Document 2, corresponding US Pat. No. 4.025,159) and Bailey et al., Japanese Patent Application Laid-Open No. 62-121043 (Patent Document 3, corresponding US Pat. No. 5,064,272). In the specification).
- Patent Document 4 corresponding US Pat. No. 4,721,649 by Berithre.
- the observation angle and the required angle for the incident angle differ depending on the combination of the observation angle and the incident angle of light.
- the capsule lens type reflective sheet generally has a retroreflective performance superior to that of the encapsulated lens type retroreflective sheet.
- the Y value used as an indicator of whiteness under natural light is generally higher for encapsulated lens type retroreflective sheets than for capsule lens type retroreflective sheets.
- the encapsulated lens type retroreflective sheet is superior to the capsule lens type retroreflective sheet with respect to the stability of the film, such as the absence of the occurrence of odor.
- an object of the present invention is to provide an encapsulated lens type retroreflective sheet that can have higher retroreflective performance than a conventional encapsulated lens type retroreflective sheet in a direction relatively close to the front.
- an encapsulated lens type retroreflective sheet of the present invention comprises a surface protective layer, a holding layer, a plurality of micro glass spheres held in the holding layer, a focus forming layer, a specular reflection layer,
- the fine glass sphere has an average particle size in the range of 70 ⁇ m to 100 ⁇ m, and a particle size in which 75% or more of the particles are in the range of ⁇ 10 ⁇ m of the average particle size. It is a distribution.
- the fine glass spheres have an average particle diameter in the range of 70 ⁇ m to 100 ⁇ m, and 75% or more of the particles are in the range of ⁇ 10 ⁇ m of the average particle diameter. Therefore, it is possible to have high retroreflection performance in a direction relatively close to the front.
- the reason for having a high retroreflection performance in a direction relatively close to the front by using such a small glass sphere is not clear to the present inventors, but when the average particle size is smaller than 70 ⁇ m, the luminance is Found that it goes down extremely.
- the average particle diameter exceeds 100 ⁇ m, it is necessary to form the focus forming layer thickly, and the focus forming layer tends to be distorted. We believe that the brightness of the reflected light will decrease. Furthermore, when the ratio of particles within the range of ⁇ 10 ⁇ m of the average particle size is smaller than 75%, the specular reflection layer is formed on the focal point of the light emitted from the micro glass sphere due to the increase in the variation ratio of the micro glass sphere. The ratio that is not formed becomes high. Therefore, the reflected light is also scattered, and it is considered that the brightness of the reflected light in a direction relatively close to the front is extremely lowered.
- the average particle size of the fine glass spheres is 80 ⁇ m to 90 ⁇ m, and the particle size distribution of the particle size of the fine glass spheres is in the range of average particle size ⁇ 10 ⁇ m It is preferable to occupy 80% or more.
- Such an encapsulated lens type retroreflective sheet can have higher reflection performance.
- the retroreflective performance under the conditions of an observation angle of 0.2 degrees and an incident angle of 5 degrees is preferably 200 cd / lx / m 2 or more, and an observation angle of 0.2 degrees. More preferably, the retroreflection performance under the condition of an incident angle of 5 degrees is 250 cd / lx / m 2 or more.
- an encapsulated lens type retroreflective sheet since it has a higher reflection performance, the visibility at night is significantly improved as compared with the conventional encapsulated lens type retroreflective sheet, and it can be used for a wide range of products. it can.
- an encapsulated lens type retroreflective sheet that can have a retroreflective performance higher than that of a conventional encapsulated lens type retroreflective sheet in a direction relatively close to the front.
- FIG. 1 is a schematic cross-sectional view illustrating an encapsulated lens type retroreflective sheet according to the present embodiment.
- the encapsulated lens type retroreflective sheet 10 includes a surface protective layer 1, a holding layer 3, a plurality of minute glass balls 4 held by the holding layer 3, a focus forming layer 5, a mirror surface
- the reflective layer 6 is provided as a main configuration.
- a printing layer 2 is provided for transmitting information to an observer or coloring a sheet.
- the printing layer 2 is not an essential configuration.
- the surface protective layer 1 is a layer having a light transmittance of 80% or more of the total light transmittance, and is not particularly limited as long as the resin has such a light transmittance. It is composed of a resin such as an alkyd resin, a fluororesin, a vinyl chloride resin, a polyester resin, a urethane resin, or a polycarbonate resin, or a combination of these resins.
- a resin such as an alkyd resin, a fluororesin, a vinyl chloride resin, a polyester resin, a urethane resin, or a polycarbonate resin, or a combination of these resins.
- acrylic resins, polyester resins, and vinyl chloride resins are preferable from the viewpoint of weather resistance and workability. Among them, acrylic resins are particularly preferable in consideration of coating suitability and dispersibility of a coloring agent when coloring.
- the surface protective layer 1 may contain various additives such as an ultraviolet absorber, a stabilizer, a plasticizer, and a crosslinking agent as long as the transparency is not significantly impaired.
- the colorant is preferably 1 to 30 parts by weight, more preferably 2 to 20 parts by weight, still more preferably 5 to 15 parts per 100 parts by weight of the solid content of the base resin. Part by weight is contained. If the addition amount of the colorant is not less than the lower limit value, sufficient coloring is obtained and excellent visibility is preferable, and if it is not more than the upper limit value, the retention layer becomes too hard and brittle. It is preferable because inconvenience can be prevented and characteristics such as mechanical strength and flexibility can be prevented from being impaired.
- the surface protective layer is uncolored or colored with a colorant that provides transparency. It is preferable that
- the retaining layer 3 is a layer that retains the minute glass spheres 4 of the encapsulated lens-type retroreflective sheet 10 and is not particularly limited as long as it is a light-transmitting resin.
- acrylic resin, alkyd resin, fluorine A resin, a vinyl chloride resin, a polyester resin, a urethane resin, a polycarbonate resin, or the like, or a combination of these resins is used.
- acrylic resins, polyester resins, and vinyl chloride resins are preferable from the viewpoint of weather resistance and workability.
- acrylic resins are particularly preferable in consideration of coating suitability and dispersibility of a coloring agent when coloring.
- the molecular weight of the resin forming the holding layer 3 is not particularly limited, but usually the weight average molecular weight of the resin (hereinafter sometimes abbreviated as Mw) is 50,000 or more, more preferably 50,000 to 400,000.
- Mw weight average molecular weight of the resin
- the resin solid content of the resin used for the holding layer 3 is usually 25 to 50%, preferably 30 to 40%, and more preferably 33 to 38%. Further, the thickness of the holding layer 3 is 15 ⁇ m to 50 ⁇ m. When the holding layer 3 is formed by laminating several layers, the coating thickness of the holding layer 3 that holds the minute glass spheres 4 is determined in accordance with conditions such as the diameter of the minute glass spheres 4.
- the total light transmittance of the holding layer 3 is not particularly limited, but is usually 80% or more, preferably 90% or more, and more preferably 95% or more.
- the holding layer 3 contains a colorant, it may be the same as when the surface protective layer 1 contains a colorant.
- various additives such as an ultraviolet absorber, a stabilizer, a plasticizer, and a curing agent can be added to the holding layer 3 as long as the physical properties thereof are not impaired.
- curing agents such as alkylated amino resins, alkylated urea resins, and isocyanate-based crosslinking agents; release agents such as silicon-based release agents and cellulose-based release agents; polyester-modified polydimethylsiloxane, silicon-based surfactants
- An additive such as a surface conditioner such as an acrylic polymer may be contained.
- the holding layer 3 holds a plurality of micro glass spheres 4.
- the micro glass sphere 4 has a function of retroreflecting light in cooperation with the specular reflection layer 6 facing each micro glass sphere 4 through the focus forming layer 5.
- the refractive index of the minute glass sphere 4 is usually 2.0 to 2.5, preferably 2.0 to 2.3.
- the average particle diameter of the micro glass spheres 4 used as elements for retroreflecting light is 70 ⁇ m to 100 ⁇ m.
- the average particle size of the fine glass spheres 4 is more preferably 80 ⁇ m to 90 ⁇ m.
- the particle size distribution of the particle size of the micro glass spheres 4 is 75% or more within the range of the average particle size ⁇ 10 ⁇ m. Further, it is more preferable that the particle size distribution occupies 80% or more within the range of the average particle size ⁇ 10 ⁇ m.
- the measurement of the average particle diameter and particle size distribution of the said micro glass sphere 4 is performed as follows. First, 10 g of fine glass spheres serving as measurement samples are taken in a dry glass container. Next, about 230 ml of an electrolytic solution (trade name: Coulter Isoton III Diluent) manufactured by BECKMAN Co. is placed in the container and stirred with a glass rod until it is uniformly dispersed to prepare a dispersion solution of micro glass spheres 4. Next, the dispersion solution is set in a Coulter counter (Multisizer 2) manufactured by BECKMAN and measurement is performed.
- Coulter counter Multisizer 2
- the focus forming layer 5 is a layer for disposing the specular reflection layer 6 at the focal position of the light that passes through each micro glass sphere 4 and is not particularly limited as long as it is a light-transmitting resin.
- a resin such as acrylic resin, alkyd resin, fluororesin, vinyl chloride resin, polyester resin, urethane resin, polycarbonate resin, butyral resin, or a combination of these resins is used.
- it is preferably composed of an acrylic resin and a butyral resin from the viewpoint of weather resistance, coating suitability, and thermal stability.
- additives such as a colorant, an ultraviolet absorber, a stabilizer, a plasticizer, and a crosslinking agent can be added to the focus forming layer 5 as long as the transparency is not significantly impaired.
- the molecular weight of the resin forming the focus forming layer 5 is not particularly limited, but usually the resin forming the focus forming layer 5 has an Mw of 100,000 or more, more preferably an Mw of 100,000 to 400,000. More preferably, Mw is 150,000 to 300,000. By using a resin that is within this range and reacted with an appropriate curing agent, the spherical focus forming layer 5 can be formed more appropriately.
- the viscosity at the time of application of the resin forming the focus forming layer 5 is usually 10 to 600 cP, preferably 30 to 600 cP, and more preferably 50 to 200 cP.
- the resin solid content of the resin of the focus forming layer 5 is usually 10 to 40%, preferably 15 to 35%, and more preferably 15 to 25%. This is because if the resin solid content is high, air bubbles are easily involved and foaming tends to occur, and if it is less than 10%, the coating amount is considerably increased.
- the thickness of the focus forming layer 5 is determined in consideration of the refractive index of the resin and the like so that the incident light beam is focused on the specular reflection layer 6, but is usually 10 ⁇ m to 60 ⁇ m, preferably 15 ⁇ m to 50 ⁇ m. Particularly preferably, the thickness is 20 ⁇ m to 40 ⁇ m.
- the total light transmittance of the focus forming layer 5 is preferably 80% or more, more preferably 90% or more, and particularly 95% or more. Is more preferable.
- the specular reflection layer 6 is a layer for reflecting light, and is usually made of a metal such as aluminum, silver, chromium, nickel, magnesium, gold, or tin.
- the specular reflection layer 6 is formed using such a metal by means such as vacuum vapor deposition or sputtering. Note that a vacuum deposition method is particularly preferable in order to uniformly form a metal thin film reflecting the shape of the base.
- the thickness of the metal reflective layer is usually 0.05 ⁇ m to 0.2 ⁇ m, preferably 0.05 ⁇ m to 0.15 ⁇ m, and particularly preferably 0.05 to 0.1 ⁇ m.
- the encapsulated lens type retroreflective sheet 10 of the present embodiment has an adhesive layer 7 for bonding to a base material such as an aluminum plate or an acrylic plate.
- the type of resin constituting the adhesive layer 7 is not particularly limited, but a resin used as a normal adhesive resin may be used.
- a resin used as a normal adhesive resin may be used.
- an acrylic resin, a silicon resin, a rubber resin, a phenol resin Etc. are used.
- an acrylic resin or a silicon resin having excellent weather resistance and good adhesive properties is preferable.
- the resin constituting the adhesive layer 7 is not particularly limited, but a resin having a higher molecular weight tends to obtain a suitable holding force, and has a Mw of 500,000 or more, more preferably 500,000 to 120. It is preferable to use 10,000 resins, more preferably 600,000 to 1,000,000 resins. Among them, the use of a resin obtained by crosslinking a resin having a Mw of 500,000 or more having a functional group with a crosslinking agent such as an isocyanate-based crosslinking agent is most preferable because a particularly excellent holding force can be obtained.
- a crosslinking agent such as an isocyanate-based crosslinking agent
- the adhesive layer 7 may be provided on the specular reflection layer 6 side, and the encapsulated lens type retroreflective sheet 10 can be affixed to the substrate via the adhesive layer 7. It is also possible to provide a light-transmitting adhesive layer on the incident side (surface protective layer 1 side) and affix the encapsulated lens type retroreflective sheet 10 to the light-transmitting substrate through the adhesive layer.
- a release film 8 is provided on the side of the adhesive layer 7 opposite to the specular reflection layer 6 side to prevent the adhesive layer 7 from adhering to an unintended location.
- the retroreflective performance of such an encapsulated lens type retroreflective sheet 10 is preferably such that the retroreflective performance under the conditions of an observation angle of 0.2 degrees and an incident angle of 5 degrees is 180 cd / lx / m 2 or more, and 200 cd.
- / is more preferably are lx / m 2 or more, further preferably be a 220 cd / lx / m 2 or more, and most preferably are 250 cd / lx / m 2 or more.
- the encapsulated lens type retroreflective sheet 10 is manufactured by the method described below. First, the resin compounding liquid for the process base material surface protective layer is applied and dried to form the surface protective layer 1.
- the process substrate is not particularly limited as long as it has sufficient strength and expands and contracts sufficiently when heated, but a substrate made of polyethylene terephthalate (PET), polyimide, vinyl chloride or the like is used. Among them, PET is particularly preferable.
- the coating method is not particularly limited as long as it can be uniformly applied at a predetermined thickness, but methods such as a reverse roll coating method and a comma direct coating method are preferably used.
- the resin compounding liquid for the holding layer 3 is applied on the surface protective layer 1 and semi-dried.
- fine glass spheres 4 are sprayed on the semi-dried resin, and heat treatment is performed.
- the embedding rate can be adjusted by embedding the micro glass spheres 4 in the resin so as to be semi-dried for each of the holding layers 3.
- the temperature of the heat treatment after the dispersion of the fine glass spheres 4 is usually 50 ° C. to 150 ° C., preferably 70 ° C. to 130 ° C., particularly preferably 80 ° C. to 120 ° C. when acrylic is used as the resin. Yes, it is preferable to dry for about 5 minutes to facilitate embedding the micro glass spheres 4. In this way, the semi-drying resin is dried, whereby the holding layer 3 that holds the micro glass spheres 4 is formed.
- the embedding rate of the micro glass sphere 4 in the holding layer 3 is not particularly limited, and varies depending on the type of resin of the holding layer 3. For example, in the case of using acrylic as the resin of the holding layer 3, It is good to set it as 20% or more with respect to the diameter of the micro glass bulb
- the focus forming layer 5 is thinner because it is easier to form the focus forming layer 5 in accordance with the spherical surface of the minute glass sphere 4.
- the burying rate of the micro glass spheres 4 is preferably 50 to 90%, and more preferably 70 to 80%. Note that the thickness of the focus forming layer 5 tends to increase as the size of the minute glass sphere 4 increases. However, when the fine glass sphere 4 is 50 to 90% as described above, the focus forming layer 5 is made thin and the focus forming layer 5 becomes thick, so that the material of the focus forming layer 5 is foamed. Can be prevented.
- a resin compounding liquid for the focus forming layer 5 is applied onto the fine glass sphere 4 and the holding layer 3 that holds the fine glass sphere 4.
- the coating method is not particularly limited as long as it can be uniformly applied with a predetermined thickness, but methods such as a reverse roll coating method and a comma direct coating method are preferably used.
- the resin compounding solution for the focus forming layer 5 is applied at room temperature, and heat-treated as necessary to cure the resin.
- the curing temperature varies depending on the type of resin / curing agent, but when an acrylic resin is used as the focus-forming layer resin, it is usually 50 ° C. to 160 ° C., preferably 70 ° C. to 155 ° C.
- the time is preferably 3 to 10 minutes.
- the focus forming layer 5 is formed by curing the resin compounding liquid.
- the specular reflection layer 7 is formed on the focus formation layer 5 with a metal thin film.
- a coating method, a vacuum vapor deposition method, or the like can be used.
- the vacuum vapor deposition method is particularly preferable.
- the thickness of the metal layer is not particularly limited, but is 0.05 ⁇ m to 0.2 ⁇ m, preferably 0.05 ⁇ m to 0.15 ⁇ m, and particularly preferably 0.05 to 0.1 ⁇ m.
- Conditions such as vapor deposition speed, temperature, and vacuum degree may be selected as appropriate according to the equipment, but it is sufficient that the metal thin film has a uniform thickness.
- the resin compounding liquid for forming the adhesive layer 7 is then applied and dried on the release film 8, and the specular reflection layer
- the surface of the intermediate product after 6 is formed and the surface of the adhesive layer are bonded together.
- the bonding condition varies depending on the pressure-sensitive adhesive constituting the adhesive layer, but when an acrylic resin is used as the pressure-sensitive adhesive, it is preferable to apply pressure while applying heat of about 50 to 90 ° C., for example.
- the encapsulated lens type retroreflective sheet 10 having the pressure-sensitive adhesive layer of the present invention can be obtained.
- Example 1 A transparent polyethylene terephthalate film (trade name: Teijin Tetron Film S-75) made by Teijin Limited and having a thickness of 75 ⁇ m was used as a process substrate. Then, on the process substrate, 100 parts by weight of an acrylic resin solution (trade name: RS-1200) manufactured by Unki Aika Co., Ltd., and a methylated melamine resin solution manufactured by Sanwa Chemical Co., Ltd. (trade name: Nicalac) 14 parts by weight of MS-11), 4 parts by weight of a cellulose derivative (trade name: CAB) manufactured by Tokushi Co., Ltd., and 0.5 parts by weight of an ultraviolet absorber (trade name: Sea soap 103) manufactured by Sipro Kasei Co., Ltd.
- an acrylic resin solution trade name: RS-1200
- a methylated melamine resin solution manufactured by Sanwa Chemical Co., Ltd. trade name: Nicalac
- MS-11 4 parts by weight of a cellulose derivative manufactured by Tokushi Co., Ltd.
- an acrylic resin (trade name: RS-3000) manufactured by Onuki Ai Co., Ltd. and an isocyanate-based crosslinking agent (trade name: Sumijoule N-75) manufactured by Sumika Bayer Urethane Co., Ltd. ) 12 parts by weight, 15 parts by weight of toluene as a solvent and 36 parts by weight of MIBK, and apply a mixed and stirred resin composition solution for forming a holding layer, and then dry at 70 ° C. for 5 minutes. A holding layer having a thickness of about 30 ⁇ m was formed.
- This holding layer has a mean particle size shown in Table 1 and a fine glass sphere manufactured by Enkiai Co., Ltd. having a particle size distribution in which the average particle size is within the range of ⁇ 10 ⁇ m as shown in Table 1.
- Name: NB K10278 was attached and heat-treated, and the fine glass spheres were submerged in the holding layer so that the fine glass spheres were exposed from the holding layer.
- the cross section was observed with a microscope, the fine glass spheres were in contact with the surface protective layer, and the holding layer retained approximately 75% of the diameter of the fine glass spheres.
- a release paper manufactured by Lintec Corporation (trade name: E2P-H (P)) as the release paper
- a cross-linking agent (trade name: Coronate L) and 16.1 parts by weight of ethyl acetate as a solvent, and apply and dry a resin mixture solution for forming an adhesive layer that is stirred and mixed.
- a pressure-sensitive adhesive layer having a thickness of about 41 ⁇ m was formed.
- the process substrate was peeled off to obtain an encapsulated lens type retroreflective sheet having the pressure-sensitive adhesive layer.
- Example 2 The fine glass spheres used in Example 1 have the average particle size specified in Table 1 and the particle size distribution with the proportion of particles shown in Table 1 within the range of ⁇ 10 ⁇ m of the average particle size.
- An encapsulated lens type retroreflective sheet having an adhesive layer was obtained in the same manner as in Example 1 except that it was changed to a micro glass sphere (trade name: NB K0922-1).
- Example 3 The fine glass spheres used in Example 1 have an average particle size specified in Table 1 and a particle size distribution with a ratio of the average particle size within the range of ⁇ 10 ⁇ m of the average particle size shown in Table 1 manufactured by Union Co., Ltd.
- An encapsulated lens type retroreflective sheet was obtained in the same manner as in Example 1 except that the glass sphere was changed to a fine glass sphere (trade name: UB-B).
- Example 4 The fine glass spheres used in Example 1 have an average particle size specified in Table 1 and a particle size distribution with a ratio of the average particle size within the range of ⁇ 10 ⁇ m of the average particle size shown in Table 1 manufactured by Union Co., Ltd.
- An encapsulated lens type retroreflective sheet was obtained in the same manner as in Example 1 except that the glass sphere was changed to a fine glass sphere (product surface: UB-C).
- Example 5 In Example 1, Asahi Co., Ltd. has the average particle size specified in Table 1 for the fine glass spheres used and the particle size distribution with the proportion of particles shown in Table 1 within the range of ⁇ 10 ⁇ m of the average particle size An encapsulated lens type retroreflective sheet was obtained in the same manner as in Example 1 except that it was changed to a technoglass micro glass sphere (trade name: SK-80).
- Example 6 In Example 1, Asahi Co., Ltd. has the average particle size specified in Table 1 for the fine glass spheres used and the particle size distribution with the proportion of particles shown in Table 1 within the range of ⁇ 10 ⁇ m of the average particle size An encapsulated lens type retroreflective sheet was obtained in the same manner as in Example 1 except that it was changed to a technoglass micro glass sphere (trade name: SK-73).
- Comparative Example 1 As Comparative Example 1, a fine glass sphere manufactured by Enkiai Co., Ltd. having a particle size distribution with the average particle diameter specified in Table 1 and the ratio of the average particle diameter within the range of ⁇ 10 ⁇ m shown in Table 1 ( An encapsulated lens type retroreflective sheet manufactured by Enkiai Co., Ltd. (trade name: 1801220AN, lot number K266C) manufactured using trade name: NB45) was used.
- Comparative Example 2 As Comparative Example 2, a fine glass sphere manufactured by Enkiai Co., Ltd. having a particle size distribution with the average particle diameter specified in Table 1 and the ratio of the average particle diameter within the range of ⁇ 10 ⁇ m shown in Table 1 ( An encapsulated lens type retroreflective sheet manufactured by Enkiai Co., Ltd. (trade name: 0811200AI, lot number P870G) manufactured using trade name: NB34) was used.
- the average particle size of the micro glass spheres is in the range of 70 ⁇ m to 100 ⁇ m, and 75% or more of the particles are in the range of ⁇ 10 ⁇ m of the average particle size. It is a particle size distribution assumed to be inside. On the other hand, in Comparative Examples 1 and 3, the particle size distribution of the fine glass spheres is less than 75% within the range of ⁇ 10 ⁇ m of the average particle size. Further, in Comparative Example 2, the average particle size of the fine glass spheres is outside the range of 70 ⁇ m to 100 ⁇ m.
- the particle size distribution of the fine glass spheres is a ratio smaller than 75% within the range of ⁇ 10 ⁇ m of the average particle size, and the average particle size of the fine glass spheres is 70 ⁇ m to 100 ⁇ m. Out of range.
- Examples 1 to 6 as shown in Table 1, the amount of retroreflected light was 260 cd / lx / m 2 or more at an observation angle of 0.2 degrees. On the other hand, as shown in Table 1, in Comparative Examples 1 to 4, the amount of retroreflected light was 200 cd / lx / m 2 or less at an observation angle of 0.2 degrees. Therefore, Examples 1 to 6 showed retroreflective performance superior to Comparative Examples 1 to 4 in a direction relatively close to the front. Further, as shown in Table 1, at the observation angle of 0.5 degree, in Examples 1 to 6, the amount of retroreflected light is 75 cd / lx / m 2 or more, and in Comparative Examples 1 to 4, the retroreflection is performed. The amount of light became 73 cd / lx / m 2 or less. Therefore, Examples 1 to 4 showed retroreflective performance equal to or higher than that of Comparative Examples 1 to 4 in a direction relatively away from the front.
- Examples 1 to 6 which are encapsulated lens type retroreflective sheets of the present invention have higher retroreflection in a direction relatively closer to the front than Comparative Examples 1 to 4 which are conventional encapsulated lens type retroreflective sheets. It has been found that it can have performance.
- an encapsulated lens type retroreflective sheet that can have a retroreflective performance higher than that of a conventional encapsulated lens type retroreflective sheet in a direction relatively close to the front.
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Abstract
Description
再帰反射性能測定器として、アドバンスト・レトロ・テクノロジー社(Advanced RetroTechnology, INC.)製「Model 920」を用い、100mm×100mmの再帰反射シート試料の再帰反射光量をJIS Z 9117に準じて、入射角を5度として、観測角0.2度、及び、観測角0.5度において、それぞれ5点について測定して、その平均値をもって再帰反射性能の値とした。なお、実使用上、一般に入射角が5度であることは、比較的再帰反射シートの正面に近く、小さな入射角であり、観測角が0.2度であることは、比較的小さな観測角である。さらに、観測角が0.5度であることは、然程再帰反射シートの正面に近くなく、小さな観測角ではない。
工程基材として帝人株式会社製の厚さ75μmの透明なポリエチレンテレフタレートフィルム(商品名:帝人テトロンフィルムS-75)を用いた。そして、工程基材上に、恩希愛化工有限公司製アクリル樹脂溶液(商品名:RS-1200)を100重量部に対して、株式会社三和ケミカル製のメチル化メラミン樹脂溶液(商品名:ニカラックMS-11)を14重量部と、株式会社トクシキ製セルロース誘導体(商品名:CAB)を4重量部と、シプロ化成株式会社製紫外線吸収剤(商品名:シーソープ103)を0.5重量部と、ビックケミー・ジャパン株式会社製レベリング剤(商品名:BYK-300)を0.04重量部と、DIC株式会社製触媒(商品名:ベッカミンP-198)を0.12重量部と、溶剤としてMIBK/トルエン=8/2の比になるように16.7重量部とを加えて、攪拌混合した表面保護層形成用の樹脂配合液を塗布し、乾燥して厚さ約40μmの無色透明な表面保護層を形成した。
実施例1において使用する微小ガラス球を表1に明記される平均粒径、及び、平均粒径の±10μmの範囲内とされる粒子が表1に示す割合の粒度分布を持つ恩希愛有限公司製微小ガラス球(商品名:NB K0922-1)に変更したこと以外は、実施例1と同様にして粘着剤層を持つ封入レンズ型再帰反射シートを得た。
実施例1において使用する微小ガラス球を表1に明記される平均粒径、及び、平均粒径の±10μmの範囲内とされる粒子が表1に示す割合の粒度分布を持つ株式会社ユニオン製微小ガラス球(商品名:UB-B)に変更したこと以外は、実施例1と同様にして封入レンズ型再帰反射シートを得た。
実施例1において使用する微小ガラス球を表1に明記される平均粒径、及び、平均粒径の±10μmの範囲内とされる粒子が表1に示す割合の粒度分布を持つ株式会社ユニオン製微小ガラス球(商品面:UB-C)に変更したこと以外は、実施例1と同様にして封入レンズ型再帰反射シートを得た。
実施例1において、使用する微小ガラス球を表1に明記される平均粒径、及び、平均粒径の±10μmの範囲内とされる粒子が表1に示す割合の粒度分布を持つ株式会社旭テクノグラス製微小ガラス球(商品名:SK-80)に変更したこと以外は、実施例1と同様にして封入レンズ型再帰反射シートを得た。
実施例1において、使用する微小ガラス球を表1に明記される平均粒径、及び、平均粒径の±10μmの範囲内とされる粒子が表1に示す割合の粒度分布を持つ株式会社旭テクノグラス製微小ガラス球(商品名:SK-73)に変更したこと以外は、実施例1と同様にして封入レンズ型再帰反射シートを得た。
比較例1として、表1に明記される平均粒径、及び、平均粒径の±10μmの範囲内とされる粒子が表1に示す割合の粒度分布を持つ恩希愛有限公司製微小ガラス球(商品名:NB45)を使用して製造した、恩希愛有限公司製封入レンズ型再帰反射シート(商品名:1801220AN、ロット番号K266C)を用いた。
比較例2として、表1に明記される平均粒径、及び、平均粒径の±10μmの範囲内とされる粒子が表1に示す割合の粒度分布を持つ恩希愛有限公司製微小ガラス球(商品名:NB34)を使用して製造した、恩希愛有限公司製封入レンズ型再帰反射シート(商品名:0811200AI、ロット番号P870G)を用いた。
比較例1の封入レンズ型再帰反射シートに用いた微小ガラス球を篩にかけて、表1に示す平均粒径、及び、平均粒径の±10μmの範囲内とされる粒子が表1に示す割合の粒度分布となる微小ガラス球を選別した。そして、この微小ガラス球を用いて、実施例1と同様に封入レンズ型再帰反射シートを作製した。
比較例1の封入レンズ型再帰反射シートに用いた微小ガラス球を篩にかけて、表1に示す平均粒径、及び、平均粒径の±10μmの範囲内とされる粒子が表1に示す割合の粒度分布となる微小ガラス球を選別した。そして、この微小ガラス球を用いて、実施例1と同様に封入レンズ型再帰反射シートを作製した。
2・・・印刷層
3・・・保持層
4・・・微小ガラス球
5・・・焦点形成層
6・・・鏡面反射層
7・・・接着剤層
8・・・剥離フィルム
9・・・光の入射方向
Claims (5)
- 表面保護層と、保持層と、該保持層に保持される複数の微小ガラス球と、焦点形成層と、鏡面反射層とを備える封入レンズ型再帰反射シートにおいて、
該微小ガラス球は、平均粒径が70μm~100μmの範囲内であり、かつ、粒子の75%以上が平均粒径の±10μmの範囲内とされる粒度分布である
ことを特徴とする封入レンズ型再帰反射シート。 - 該微小ガラス球の平均粒径が80μm~90μmであることを特徴とする請求項1記載の封入レンズ型再帰反射シート。
- 該微小ガラス球の粒度分布が、平均粒径±10μmの範囲内において80%以上を占めることを特徴とする請求項1又は2のいずれか1項に記載の封入レンズ型再帰反射シート。
- 観測角0.2度、入射角5度の条件下における再帰反射性能が、200cd/lx/m2以上であることを特徴とする請求項1から3のいずれか1項に記載の封入レンズ型再帰反射シート。
- 観測角0.2度、入射角5度の条件下における再帰反射性能が、250cd/lx/m2以上であることを特徴とする請求項1から3のいずれか1項に記載の封入レンズ型再帰反射シート。
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JP2005292805A (ja) * | 2004-03-10 | 2005-10-20 | Kiwa Kagaku Kogyo Kk | 再帰性反射シート及び外照式照明システム |
JP2006276186A (ja) * | 2005-03-28 | 2006-10-12 | Dainippon Printing Co Ltd | 再帰反射シートおよびその製造方法 |
JP2007034034A (ja) * | 2005-07-28 | 2007-02-08 | Nippon Carbide Ind Co Inc | 再帰反射シート |
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JP2005292805A (ja) * | 2004-03-10 | 2005-10-20 | Kiwa Kagaku Kogyo Kk | 再帰性反射シート及び外照式照明システム |
JP2006276186A (ja) * | 2005-03-28 | 2006-10-12 | Dainippon Printing Co Ltd | 再帰反射シートおよびその製造方法 |
JP2007034034A (ja) * | 2005-07-28 | 2007-02-08 | Nippon Carbide Ind Co Inc | 再帰反射シート |
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