WO2013002595A2 - Film blanc - Google Patents

Film blanc Download PDF

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Publication number
WO2013002595A2
WO2013002595A2 PCT/KR2012/005164 KR2012005164W WO2013002595A2 WO 2013002595 A2 WO2013002595 A2 WO 2013002595A2 KR 2012005164 W KR2012005164 W KR 2012005164W WO 2013002595 A2 WO2013002595 A2 WO 2013002595A2
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WO
WIPO (PCT)
Prior art keywords
irradiation
film
white film
reflectance
titanium dioxide
Prior art date
Application number
PCT/KR2012/005164
Other languages
English (en)
Other versions
WO2013002595A3 (fr
Inventor
Do Hyun Kim
Dong Jin Kim
Si Min Kim
Yun Jo Kim
Gi Sang Song
Myung Eun Song
Original Assignee
Kolon Industries, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from KR1020110064789A external-priority patent/KR101731486B1/ko
Priority claimed from KR1020120070180A external-priority patent/KR20130077753A/ko
Application filed by Kolon Industries, Inc. filed Critical Kolon Industries, Inc.
Publication of WO2013002595A2 publication Critical patent/WO2013002595A2/fr
Publication of WO2013002595A3 publication Critical patent/WO2013002595A3/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0284—Diffusing elements; Afocal elements characterized by the use used in reflection

Definitions

  • the following disclosure relates to a single-layer white film, and more particularly to a single-layer white film having excellent reflectance, luminance, and light fastness, to thereby be used as a reflection film for a backlight.
  • the recent uses of white films are expanding from industrial films such as the existing labels, graphics for printing, and the like to a reflecting plate and a reflection film for a liquid crystal display, a rear reflecting sheet of an illuminating sign, or recently a rear reflecting sheet for a solar cell (as a replacement for a fluorine film).
  • the white films having these uses have been widely employed for the liquid crystal display, from the conventional notebook and a monitor to a mobile terminal device, a smart device, and a large-area TV, and also, demands for the white films are rapidly increasing.
  • the reflection film very closely installed at the light source device requires optical properties such as high opacity, high reflectance, and high luminance.
  • the UV light emitted from a cathode-ray tube or an LED light source cause a color of the film to be changed (yellowed), resulting in decreased whiteness and increased yellowness, thereby reducing the reflectance and luminance of the film.
  • the reflection film is closer to the light source. Therefore, light fastness against UV light as well as high opacity and high reflectance is acutely required for the reflection film. The reason is that the change in color, a decrease in reflectance, or the like, due to UV light and heat may cause a decrease in luminance of the reflection film.
  • a reflective interface having a high-low-high refractive index distribution e.g., refractive index of polyester; 1.64 - refractive index of void; 1.0 - refractive index of barium sulfate; 1.64
  • the loss of light partially occurs when, in a light scattering and refracting procedure on the reflective interface, the light is scattered and the light refracted and absorbed into the film is not finally reflected, and thus, the reflecting efficiency is decreased.
  • Patent Document 1 Japanese Patent Laid-Open Publication No. 2004-330727 (2004.11.25)
  • Patent Document 2 Japanese Patent Laid-Open Publication No. 1992-239540 (1992.08.27)
  • An embodiment of the present invention is directed to providing a white film in a single layer type but not a coextrusion type and exhibiting excellent reflectance and luminance, and to provide a white film having a single layer and obtaining sufficient reflectance and luminance by using an inorganic material with enough content that film breakage can not be influenced.
  • another embodiment of the present invention is to directed to providing a white film capable of being produced in a single layer type but not a coextrusion type as well as having sufficient high reflectance and high opacity, having no productivity problems such as film breakage or the like due to generation of voids during a stretching procedure, and exhibiting excellent light fastness against UV light.
  • the present invention provides a white film exhibiting sufficient reflectance and luminance in a single layer even through a small input amount by modifying and restricting an inorganic material used in manufacturing a white polyester film.
  • this film is characterized by having no voids therein, and exhibiting excellent thermal stability by suppressing the use of copolymerization that uses an excessive amount of particles.
  • the present invention is characterized by providing a single-layer white film having a reflectance of 95% or higher at 550nm, that includes a polyester resin, and rutile type titanium dioxide surface-treated with at least one of organic materials and inorganic materials.
  • a reflectance may be 96 ⁇ 99%; a relative luminance may be 98 ⁇ 102%; a reflectance reduction after UV irradiation (wavelength: 310nm, intensity: 1.23W/m2, temperature: 60°C, time: 99 hours) may be 3.00 or less; a value of ⁇ E * calculated by Equation 1 below, from CIE LAB color difference measurement values based on the measurement before UV irradiation, may be 3.00 or less; a whiteness index decrease may be 10 or less; and a yellowness index increase may be 10 or less.
  • Equation 1 L * is lightness, a * is hue(rangefromredtogreen), b * is chroma(rangefrombluetoyellow), ⁇ L * is L 2 * -L 1 * , ⁇ a * is a 2 * -a 1 * , ⁇ b * is b 2 * -b 1 * , L 2 * is lightness after UV irradiation, L 1 * is lightness before UV irradiation, a 2 * is hue after UVirradiation, a 1 * is huebefore UV irradiation, b 2 * is chroma after UV irradiation, and b 1 * is chroma before UV irradiation; and the UV irradiation is carried out at a wavelength of 310nm, an intensity of 1.23W/m2, and a temperature of 60°C for 99 hours.
  • the surface-treated rutile type titanium dioxide may have an average particle size of 0.1 to 0.7 ⁇ m, and may be included in 10 to 30 wt% based on the white film.
  • the organic material may be a hydrophobic material and the inorganic material may be metal oxide.
  • the hydrophobic material may be selected from polysiloxane, polyolefin, and perfluoropolymer, and the metal oxide may be selected from alumina, silica, and zirconia.
  • organic material or inorganic material may be included in 1 to 10wt% based on the entire weight of the surface-treated rutile type titanium dioxide.
  • the polyester resin may be preferably polyethylene terephthalate, and the polyester resin may have an intrinsic viscosity of 0.6 to 1.2dl/g.
  • the rutile type titanium dioxide surface-treated with at least one of the organic material and the inorganic material is used, and thus, workability is stable at the time of a compounding procedure; dispersibility of particles is excellent; adhesive strength with a polyester matrix resin is excellent at the time of a film stretching procedure so that voids are hardly generated, thereby suppressing the loss of light due to voids; and light fastness is secured by the inorganic material so that a luminance decrease due to long-time exposure to a light source is prevented.
  • the present inventors studied in order to solve problems caused by manufacturing films through coextrusion of the prior art while increasing the particle content to improve the reflectance and manufacture a white film, as a single-layer film, having excellent reflectance equal to that of the coextrusion film and excellent luminance.
  • the present inventors confirmed that a white film having a desired excellent reflectance, of particularly 95% or higher, by using rutile type titanium dioxide as an inorganic particle at the time of manufacturing the white film in a single layer, surface-treating the rutile type titanium dioxide with at least one of organic materials and inorganic materials, and controlling the average particle size and the content of the rutile type titanium dioxide to be within the specific range, and then completed the present invention.
  • a first aspect of the present invention is to provide a single-layer white film, which includes a polyester resin, and rutile type titanium dioxide surface-treated with at least one of organic materials and inorganic materials, may simultaneously satisfy the following optical properties: a reflectance at 550nm is 95% or higher; a reflectance reduction after UV irradiation (wavelength: 310nm, intensity: 1.23W/m2, temperature: 60°C, time: 99 hours) is 3.00 or less; a value of ⁇ E * calculated by Equation 1 below, from CIE LAB color difference measurement values based on the measurement before UV irradiation, is 3.00 or less; a whiteness index decrease is 10 or less; and a yellowness index increase is 10 or less.
  • L * is lightness, a * is hue(rangefromredtogreen), b * is chroma(rangefrombluetoyellow), ⁇ L * is L 2 * -L 1 * , ⁇ a * is a 2 * -a 1 * , ⁇ b * is b 2 * -b 1 * , L 2 * is lightness after UV irradiation, L 1 * is lightness before UV irradiation, a 2 * is hue after UV irradiation, a 1 * is hue before UV irradiation, b 2 * is chroma after UV irradiation, and b 1 * is chroma before UV irradiation; and the UV irradiation is carried out at a wavelength of 310nm, an intensity of 1.23W/m2, and a temperature of 60°C for 99 hours.
  • a second aspect of the present invention is to provide a single-layer white film, which includes a polyester resin, and rutile type titanium dioxide surface-treated with at least one of organic materials and inorganic materials, has the following optical properties: a reflectance at 550 nm is 96% to 99% and a relative luminance is 98% to 102%.
  • the first aspect and the second aspect are for explaining embodiments of the present invention and do not limit the present invention.
  • the present invention is directed to a single-layer white film including a polyester resin, and rutile type titanium dioxide to be surface-treated with at least one of organic materials and inorganic materials; simultaneously satisfying the following optical properties: a reflectance at 550nm is 95% or higher; a reflectance reduction after UV irradiation (wavelength: 310nm, intensity: 1.23W/m2, temperature: 60°C, time: 99 hours) is 3.00 or less; a value of ⁇ E * calculated by Equation 1 below, from CIE LAB color difference measurement values based on the measurement before UV irradiation, is 3.00 or less; a whiteness index decrease is 10 or less; and a yellowness index increase is 10 or less; and simultaneously satisfying a reflectance of 96% to 99% at 550nm and a relative luminance of 98% to 102%.
  • L * is lightness, a * is hue(rangefromredtogreen), b * is chroma(rangefrombluetoyellow), ⁇ L * is L 2 * -L 1 * , ⁇ a * is a 2 * -a 1 * , ⁇ b * is b 2 * -b 1 * , L 2 * is lightness after UV irradiation, L 1 * is lightness before UV irradiation, a 2 * is hue after UV irradiation, a 1 * is hue before UV irradiation, b 2 * is chroma after UV irradiation, and b 1 * is chroma before UV irradiation; and the UV irradiation is carried out at a wavelength of 310nm, an intensity of 1.23W/m2, and a temperature of 60°C for 99 hours.
  • the present invention may be applied to sign boards for various kinds of advertisements or bases for reflecting plates of liquid crystal displays, or base films for back sheets for solar cells.
  • the values of ⁇ E * , or the change range in whiteness index or yellowness index deviates from the above range even though the reflectance or the whiteness before UV irradiation is excellent, light fastness of the present invention against LED lamps or the external solar light may be deteriorated, resulting in deteriorated reflectance and deteriorated luminance, thereby deteriorating the use as reflecting plates for display devices or efficiency of solar light modules, and thus, the product value of the present invention may be reduced.
  • the reflectance is 95 ⁇ 99.2%; the reflectance reduction after UV irradiation (wavelength: 310nm, intensity: 1.23W/m2, temperature: 60°C, time: 99 hours) is 0.3 ⁇ 2.0; the value of ⁇ E * calculated by Equation 1 above, from CIE LAB color difference measurement values based on the measurement before UV irradiation, is 0.37 ⁇ 2.48; the whiteness decrease is 3 ⁇ 8; and the yellowness index increase is 1 ⁇ 7.
  • the reflectance reduction, the value of ⁇ E * , the whiteness index decrease, and the yellowness index increase are numerical values exhibiting light fastness, and these optical properties mean each difference between optical property after UV irradiation and optical property before UV irradiation while the UV irradiation is carried out at a wavelength of 310nm, an intensity of 1.23W/m2, and a temperature of 60°C for 99 hours.
  • Titanium dioxide used in order to satisfy the above optical properties has three kinds of crystalline structures such as anatase, rutile, and brookite, depending on the preparation method thereof.
  • the crystalline structures are changed due to a phase change when titanium dioxide is prepared by a sulfuric acid method or a chlorine method.
  • Rutile type titanium dioxide has a more dense crystalline structure and a relatively high refractive index, which may be confirmed by an X-ray crystalline structure pattern.
  • titanium dioxide having a rutile structure is preferable since it has an adsorption capability with respect to UV light.
  • the demerit of conventional white film is deteriorating efficiency in reflectance by formation of voids. Because there is scattering of light on the void interface, moreover refraction of the light into the film.
  • titanium dioxide having a rutile structure has a high refractive index of 2.7, it may obtain strong scattering due to a difference from polyethylene terephthalate (refractive index: 1.6) without formation of voids.
  • particles need to be well dispersed in the film, thereby efficiently increasing the number of reflective interfaces between polyester and particles, and at the same time, affinity between the particles and the polyester matrix needs to be enhanced, thereby suppressing the generation of voids.
  • affinity between the particles and the polyester matrix needs to be enhanced, thereby suppressing the generation of voids.
  • the voids are generated during a stretching procedure as the affinity is deteriorated, and these generated voids may cause the decrease in reflecting efficiency of light.
  • the organic material is preferable a hydrophobic material, and the hydrophobic material is preferably polysiloxane based polymers, polyolefin based polymers, perfluoro-based polymers, or the like, but is not limited thereto.
  • the content of the hydrophobic material for the surface treatment is preferably 1 ⁇ 10wt% based on the entire weight, 100wt%, of the surface-treated rutile type titanium dioxide. If the content is below 1wt%, effect of reducing voids is insignificant, and if the content is above 10wt%, the amount of titanium dioxide is relatively small, and thus, it is rather difficult to anticipate the increase in reflectance and luminance.
  • the rutile type titanium dioxide is surface-treated with a hydrophobic material, there can be obtained a film where workability is stable during a compounding procedure; the particles are excellently dispersed; the adhesive strength between the polyester matrix and the resin is favorable at the time of a film stretching process, and thus, the voids are difficult to generate; and hydrolysis resistance or weather resistance is excellent.
  • the rutile type titanium dioxide is coated with a hydrophilic material
  • the particles are vulnerable to moisture, and thus, processability is severely deteriorated due to agglomeration of particles at the time of manufacturing a master batch and pyrolysis of the master batch is accelerated by the moisture at the time of compounding.
  • this master batch is used for the film, the hydrolysis resistance or weather resistance of the film may be severely deteriorated and yellowness may severely occur.
  • the white film is required to have excellent reflectance and excellent light fastness in order to be used as an optical base film for a BLU(back light unit).
  • the titanium dioxide particles exposed to the light by a CCFL or LED light source release electrons since activation energy becomes high due to the light, and form OH radicals from the surrounding moisture, thereby promoting decomposition of the polyester film. Resultantly, as for the film exposed to the light source for a long time, the yellowness index is increased and the reflecting efficiency is deteriorated, resulting in a decreased luminance. Therefore, in order to suppress photoactivity of this titanium dioxide, the surface of the titanium dioxide is preferably coated with an inorganic material such as silica, alumina, zirconia, or the like.
  • the average particle size of the inorganic materials is preferably smaller than the average particle size of the surface-treated titanium dioxide and more preferably 0.001 to 0.2 ⁇ m, but is not limited thereto.
  • the content of the inorganic material for the surface treatment is preferably 1 ⁇ 10wt% based on the entire weight, 100wt%, of the surface-treated rutile type titanium dioxide. If the content is below 1wt%, the photoactivity suppressing function is deteriorated, and thus, the reflectance and the luminance may be deteriorated. If the content is above 10wt%, the amount of titanium dioxide is relatively small, and thus, it is rather difficult to anticipate the increase in reflectance and luminance.
  • the rutile type titanium dioxide surface-treated with at least one of organic materials and inorganic materials used in order to achieve the optical properties is characterized by having an average particle size of 0.1 ⁇ 0.7 ⁇ m and being included in 10 ⁇ 30wt% in the film.
  • the average particle size of the rutile type titanium dioxide surface-treated with at least one of organic materials and inorganic materials is appropriately 0.1 ⁇ 0.7 ⁇ m, and preferably, 0.15 ⁇ 0.59 ⁇ m.
  • the particle size of titanium dioxide for maximally exhibiting the light reflection of titanium dioxide corresponds to a half the wavelength of visible light (400 ⁇ 800nm), and thus, the particle size of titanium dioxide is more preferably 0.2 ⁇ 0.4 ⁇ m, which is effective for improving the reflectance.
  • the film has a high whiteness index due to the refraction on the interface between the particle and the polymer resin, resulting from a difference between a refractive index of titanium dioxide and a refractive index of the polyester resin.
  • the particle size is below 0.1 ⁇ m, this size is advantageous in view of the fact that there were a relatively large number of reflective interfaces based the same content.
  • the titanium dioxide particles are well agglomerated, and thus, difficult to disperse, and the number of substantial reflective interfaces is not increased due to agglomeration of the particles.
  • a filter may be frequently clogged at the time of a compounding process and a film manufacturing process.
  • the particle size is above 0.7 ⁇ m, the light reflectance may be decreased at the visible light region.
  • the surface roughness of the film may be increased, and thus, the rutile type titanium dioxide particles having high hardness may cause a surface of a stretching roll to be damaged during film manufacturing and stretching processes, and the gloss of the film is also deteriorated due to an increase in surface roughness.
  • the content of rutile type titanium dioxide surface-treated with at least one of organic materials and inorganic materials in the film is appropriately 10 ⁇ 30wt%, preferably 12 ⁇ 28wt%, and more preferably 14 ⁇ 25wt%. If the content is below 10wt%, sufficient opacity and reflectance can not be obtained in spite of rutile type titanium dioxide. If the content is above 30wt%, sufficient opacity can be obtained, but, rather, a strong scattered light influences the loss of light, and thus, the reflectance may not be increased or partially decreased. Moreover, the operating capability is deteriorated in spite of particles that do not form voids, and thus, productivity may be decreased.
  • polyethyleneterephthalate may be used as the polyester, and more preferably, polyethyleneterephthalate having an intrinsic viscosity of 0.60 ⁇ 1.20dl/g. If the viscosity of the resin is below this range, the viscosity thereof may be further decreased due to pyrolysis generated during the compounding procedure, and the stretching ratio of the film may not be increased, and thus, there cannot be manufactured a film having sufficient surface smoothness and mechanical properties. If the viscosity of the resin is above this range, the compounding process is difficult and the filter pressure of a film manufacturing line is increased at the time of manufacturing the film, and thus, the workability may be significantly deteriorated.
  • the particles When the white film of the present invention is manufactured, the particles may be inputted in a stage of preparing a master batch or may be added at the time of polyester polymerization, in like manufacturing of general white films.
  • the rutile type titanium dioxide surface-treated with at least one of organic materials and inorganic materials is applied to the single-layer white film, and thus, the reflectance is 96 to 99% and the relative luminance is 98 to 102%, which shows a remarkable improvement.
  • the single-layer white film of the present invention is suitable to be used as a BLU(back light unit) reflecting sheet in the range satisfying the above optical properties.
  • optical properties were measured by the following measurement methods.
  • measurement angle was 3°20"
  • average time for which a detector detects a signal was 0.1s
  • analysis data interval was 1nm
  • scan rate was 600nm/min.
  • a diffusion sheet and a prism sheet were removed from a side-bar type edge-lit 17-inch backlight unit, and then, a reflection film was provided at the lowest end thereof and a light guiding plate was placed thereon.
  • the measurement values at 13 points in the 17-inch backlight unit were obtained by using a luminance measuring instrument, BM-7, while the environment was maintained at 25°C for one hour or longer after the light was on, and then an average value thereof was taken.
  • Relative luminance (%) luminance (cd/m2) of measured film / luminance (1720cd/m2) of UXSP by Teijin-Dupont Company ⁇ 100.
  • the reflectance reduction is expressed by a change (reduction) degree between a measurement value after UV irradiation and a measurement value before UV irradiation.
  • the UV irradiation was carried out at a wavelength of 310nm, an intensity of 1.23W/m2, and a temperature of 60°C for 99 hours. That is, the reflectance reduction indicates a difference between the reflectance measured by Item 1 above after UV irradiation and the reflectance measured by Item 1 above before UV irradiation.
  • the whiteness index decrease is expressed by a change (reduction) degree between a measurement value after UV irradiation and a measurement value before UV irradiation.
  • the UV irradiation was carried out at a wavelength of 310nm, an intensity of 1.23W/m2, and a temperature of 60°C for 99 hours. That is, the whiteness index decrease indicates a difference between the whiteness index measured by the following measurement method after UV irradiation and the whiteness measured by the following measurement method before UV irradiation.
  • Samples of a film were taken at a interval of 500mm in a finished width direction thereof, and then were prepared in a size of 100mm ⁇ 100mm. Measurement was carried out according to the ASTM E313 standard by using the 600TM model by Datacolor Company. The whiteness index measurement method followed the CIE STM 1979.
  • Y luminance factor
  • WI 100 in the case of a complete white subject and WI may increase up to 150 in the case of treatment with fluorescence whitening agent.
  • WI Whiteness Index
  • the yellowness index increase is expressed by a change (increase) degree between a measurement value after UV irradiation and a measurement value before UV irradiation.
  • the UV irradiation was carried out at a wavelength of 310nm, an intensity of 1.23W/m2, and a temperature of 60°C for 99 hours. That is, the yellowness index increase indicates a difference between the yellowness index measured by the following measurement method after UV irradiation and the yellowness index measured by the following measurement method before UV irradiation.
  • Samples of a film were taken at a interval of 500mm in a finished width direction thereof, and then were prepared in a size of 100mm ⁇ 100mm. Measurement was carried out according to the ASTM E313 standard by using the 600TM model by Datacolor Company. The yellowness index measurement method followed the ASTM E 313.
  • Y, Z chromaticity coordinates of a subject to be measured
  • L * is lightness, a * is hue(rangefromredtogreen), b * is chroma(rangefrombluetoyellow), ⁇ L * is L 2 * -L 1 * , ⁇ a * is a 2 * -a 1 * , ⁇ b * is b 2 * -b 1 * , L 2 * is lightness after UV irradiation, L 1 * is lightness before UV irradiation, a 2 * is hue after UV irradiation, a 1 * is hue before UV irradiation, b 2 * is chroma after UV irradiation, and b 1 * is chroma before UV irradiation; and the UV irradiation is carried out at a wavelength of 310nm, an intensity of 1.23W/m2, and a temperature of 60°C for 99 hours.
  • the melted resin extruded through the T-die was cooled in a casting roll of 30°C, and then stretched by 3.0 times in a mechanical direction through preheating at 95°C, and stretched by 3.0 times in a transverse direction at a stretching temperature of 135°C.
  • the final line speed of the film was 35.1m/m.
  • the operating capability was estimated whether the film is stably manufactured, and estimated following the following standard.
  • ⁇ Film was stably manufactured without film breakage for 8 hours or longer but shorter than 12 hours.
  • a master batch was prepared by compounding, at 280°C, 50wt% of polyethyleneterephthalate having an intrinsic viscosity of 0.65dl/g and 50wt% of rutile type titanium dioxide surface-treated with a hydrophobic material (weight average molecular weight: 50,000, polysiloxane, 2wt% based on the total weight of particles) having an average particle size of 0.15 ⁇ m.
  • the master batch and polyethyleneterephthalate having an intrinsic viscosity of 0.68dl/g were mixed such that the particle content in the film is 12wt% as shown in Table 1, and the mixture was inputted to an extruder to be melt-extruded at 285°C into sheets, and thus, a film having a thickness of 188 ⁇ m was manufactured.
  • the optical properties of the manufactured film are shown in Table 3.
  • the film was manufactured by the same method as Example 1 above, except that the average particle size and content of rutile type titanium dioxide surface-treated with a hydrophobic material (weight average molecular weight: 50,000, polysiloxane, 2wt% based on the total weight of particles) were changed as shown in Table 1.
  • the optical properties of the manufactured film are shown in Table 3.
  • a master batch was prepared by compounding, at 280°C, 50wt% of polyethyleneterephthalate having an intrinsic viscosity of 0.65dl/g and 50wt% of rutile type titanium dioxide (average particle size: 0.12 ⁇ m) surface-treated with a hydrophobic material (weight average molecular weight: 50,000, polysiloxane, 2wt% based on the total weight of particles) and an inorganic material (Zirconia of an average particle size of 0.05 ⁇ m, 2wt% based on the total weight of particles).
  • the master batch and polyethyleneterephthalate having an intrinsic viscosity of 0.68dl/g were mixed such that the particle content in the film is 28wt% as shown in Table 1, and the mixture was inputted to an extruder to be melt-extruded at 285°C into sheets, and thus, a film having a thickness of 188 ⁇ m was manufactured.
  • the optical properties of the manufactured film are shown in Table 3.
  • the film was manufactured by the same method as Example 1 above, except that the average particle size and content of rutile type titanium dioxide surface-treated with a hydrophobic material (weight average molecular weight: 50,000, polysiloxane, 2wt% based on the total weight of particles) and an inorganic material (Zirconia of an average particle size of 0.05 ⁇ m, 2wt% based on the total weight of particles) were changed as shown in Table 1.
  • Table 1 The optical properties of the manufactured film are shown in Table 3.
  • the film was manufactured by the same method as Example 1 while barium sulfate having an average particle size of 0.3 ⁇ m was used as an inorganic particle and was included in 20wt% in the film.
  • the optical properties of the manufactured film are shown in Table 4.
  • the film was manufactured by the same method as Example 1 while barium sulfate having an average particle size of 1.68 ⁇ m was used as an inorganic particle and was included in 20wt% in the film.
  • the optical properties of the manufactured film are shown in Table 4.
  • the film was manufactured by the same method as Example 1 while calcium carbonate having an average particle size of 0.5 ⁇ m was used as an inorganic particle and was included in 20wt% in the film.
  • the optical properties of the manufactured film are shown in Table 4.
  • the film was manufactured by the same method as Example 1 while calcium carbonate having an average particle size of 1.26 ⁇ m was used as an inorganic particle and was included in 15wt% in the film.
  • the optical properties of the manufactured film are shown in Table 4.
  • the film was manufactured by the same method as Example 1 while anatase type titanium dioxide surface-treated with a hydrophobic material (weight average molecular weight: 50,000, polysiloxane, 2wt% based on the total weight of particles) was used and was included in 12wt% in the film, as shown in Table 2 below.
  • the optical properties of the manufactured film are shown in Table 4.
  • the film was manufactured by the same method as Example 1 while rutile type titanium dioxide that is not surface-treated and has an average particle size of 0.12 ⁇ m was used and was included in 28wt% in the film.
  • the optical properties of the manufactured film are shown in Table 4.
  • a master batch was prepared by compounding, at 280°C, 50wt% of polyethyleneterephthalate having an intrinsic viscosity of 0.65dl/g and 50wt% of rutile type titanium dioxide surface-treated with a hydrophilic material (weight average molecular weight: 60,000, polyvinyl alcohol, 2wt% based on the total weight of particles) having an average particle size of 0.3 ⁇ m.
  • the master batch and polyethyleneterephthalate having an intrinsic viscosity of 0.65dl/g were mixed such that the particle content in the film is 15wt% as shown in Table 2, and the mixture was inputted to an extruder to be melt-extruded at 285°C into sheets, and thus, a film having a thickness of 188 ⁇ m was manufactured.
  • the optical properties of the manufactured film are shown in Table 4.
  • the film was manufactured by the same method as Example 1 while anatase type titanium dioxide surface-treated with a hydrophilic material (weight average molecular weight: 60,000, polyvinyl alcohol, 2wt% based on the total weight of particles) was used and was included in 15wt% in the film, as shown in Table 2 below.
  • the optical properties of the manufactured film are shown in Table 4.
  • the film was manufactured by the same method as Example 1 above, except that the average particle size and content of rutile type titanium dioxide surface-treated with a hydrophobic material (weight average molecular weight: 50,000, polysiloxane, 2wt% based on the total weight of particles) were changed as shown in Table 2.
  • the optical properties of the manufactured film are shown in Table 4.
  • the film was manufactured by the same method as Example 1 above, except that the average particle size and content of rutile type titanium dioxide surface-treated with a hydrophobic material (weight average molecular weight: 50,000, polysiloxane, 2wt% based on the total weight of particles) and an inorganic material (Zirconia of an average particle size of 0.05 ⁇ m, 2wt% based on the total weight of particles) were changed as shown in Table 2.
  • Table 2 The optical properties of the manufactured film are shown in Table 4.
  • Examples 1 to 11 where titanium dioxide surface-treated with at least one of an organic material and an inorganic material was used showed 95% or higher of reflectance, as compared with the cases where rutile type titanium dioxide that was not surface-treated or other inorganic particles were used.
  • the relative luminance and the light fastness after UV irradiation were satisfied within the desired ranges and the operating capability was excellent.
  • the white film of the present invention while being a single-layer film, can satisfy a reflectance of 95% or higher and excellent relative luminance and light fastness, and have excellent optical properties to be used as an optical film.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Laminated Bodies (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

L'invention porte sur un film blanc monocouche, et plus particulièrement, un film blanc monocouche ayant une réflectance, une luminance et une solidité à la lumière excellentes, pour ainsi être utilisé en tant que film de réflexion pour un rétroéclairage.
PCT/KR2012/005164 2011-06-30 2012-06-29 Film blanc WO2013002595A2 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
KR1020110064789A KR101731486B1 (ko) 2011-06-30 2011-06-30 백색필름
KR10-2011-0064789 2011-06-30
KR10-2011-0145355 2011-12-29
KR20110145355 2011-12-29
KR1020120070180A KR20130077753A (ko) 2011-12-29 2012-06-28 백색필름
KR10-2012-0070180 2012-06-28

Publications (2)

Publication Number Publication Date
WO2013002595A2 true WO2013002595A2 (fr) 2013-01-03
WO2013002595A3 WO2013002595A3 (fr) 2013-03-14

Family

ID=47424697

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2012/005164 WO2013002595A2 (fr) 2011-06-30 2012-06-29 Film blanc

Country Status (2)

Country Link
TW (1) TWI579323B (fr)
WO (1) WO2013002595A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150104600A1 (en) * 2013-10-14 2015-04-16 Samsung Electro-Mechanics Co., Ltd. Touch sensor
CN104656172A (zh) * 2015-02-12 2015-05-27 宁波长阳科技有限公司 一种高挺度反射膜
FR3017873A1 (fr) * 2014-02-27 2015-08-28 Baikowski Suspension pour revetement reflechissant de dispositif d'eclairage et procede de fabrication dudit revetement reflechissant

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10802385B2 (en) * 2017-08-08 2020-10-13 Panasonic Intellectual Property Management Co., Ltd. Phosphor plate, light source apparatus, and projection display apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5180658A (en) * 1989-03-16 1993-01-19 Konica Corporation White polyester composition and support for photography
KR960017142A (ko) * 1994-11-30 1996-06-17 안시환 폴리에스테르 필름
KR19990047191A (ko) * 1997-12-03 1999-07-05 조정래 백색 폴리에스테르 필름의 제조방법
US20020187328A1 (en) * 2001-03-15 2002-12-12 Ursula Murschall White, biaxially oriented film made from a crystallizable thermoplastic with high whiteness and with additional functionality
US20060263592A1 (en) * 2003-09-11 2006-11-23 Hiroshi Kusume Polyester film

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5180658A (en) * 1989-03-16 1993-01-19 Konica Corporation White polyester composition and support for photography
KR960017142A (ko) * 1994-11-30 1996-06-17 안시환 폴리에스테르 필름
KR19990047191A (ko) * 1997-12-03 1999-07-05 조정래 백색 폴리에스테르 필름의 제조방법
US20020187328A1 (en) * 2001-03-15 2002-12-12 Ursula Murschall White, biaxially oriented film made from a crystallizable thermoplastic with high whiteness and with additional functionality
US20060263592A1 (en) * 2003-09-11 2006-11-23 Hiroshi Kusume Polyester film

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150104600A1 (en) * 2013-10-14 2015-04-16 Samsung Electro-Mechanics Co., Ltd. Touch sensor
FR3017873A1 (fr) * 2014-02-27 2015-08-28 Baikowski Suspension pour revetement reflechissant de dispositif d'eclairage et procede de fabrication dudit revetement reflechissant
CN104656172A (zh) * 2015-02-12 2015-05-27 宁波长阳科技有限公司 一种高挺度反射膜

Also Published As

Publication number Publication date
WO2013002595A3 (fr) 2013-03-14
TW201305263A (zh) 2013-02-01
TWI579323B (zh) 2017-04-21

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