WO2006054475A1 - 脂肪族ポリエステル系樹脂反射フィルム及び反射板 - Google Patents
脂肪族ポリエステル系樹脂反射フィルム及び反射板 Download PDFInfo
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- WO2006054475A1 WO2006054475A1 PCT/JP2005/020590 JP2005020590W WO2006054475A1 WO 2006054475 A1 WO2006054475 A1 WO 2006054475A1 JP 2005020590 W JP2005020590 W JP 2005020590W WO 2006054475 A1 WO2006054475 A1 WO 2006054475A1
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- reflective film
- aliphatic polyester
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- resin
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/29—Compounds containing one or more carbon-to-nitrogen double bonds
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
- G02B5/0808—Mirrors having a single reflecting layer
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0065—Manufacturing aspects; Material aspects
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133553—Reflecting elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/02—Function characteristic reflective
Definitions
- the present invention relates to an aliphatic polyester resin reflection film and a reflection plate including the reflection film, and more particularly to a reflection film used for a reflection plate of a liquid crystal display device, a lighting fixture, an illumination signboard, and the like. Is.
- reflective films have been used in the fields of reflectors for liquid crystal display devices, projection screens and planar light source members, reflectors for lighting fixtures, reflectors for lighting signs, and the like.
- liquid crystal display reflectors in order to improve the performance of the backlight unit by supplying as much light as possible to the liquid crystal due to the demand for larger screens and advanced display performance, Therefore, there is a need for a reflective film with reflective performance.
- a liquid crystal display device including a backlight unit and a liquid crystal display element that can be thinned and easily displays an image
- a backlight unit an edge light system is often used in which a linear light source such as a fluorescent tube is provided at one end of a light-transmitting light guide plate.
- a surface light source is often formed by partially covering one surface of a light guide plate with a light diffusing material and further covering the entire surface with a reflecting material. Such a reflective material is required to have high reflection performance.
- a white sheet formed by adding titanium oxide to an aromatic polyester resin is known as a reflective Finolem, but is required. It did not have such high light reflectivity.
- JP-A-4-239540 a sheet formed by adding a filler to an aromatic polyester resin is stretched to form fine voids in the sheet, and light is emitted. There was a force S that caused the scattering reflection, a force that did not have the high light reflectivity required.
- the aromatic ring contained in the molecular chain of the aromatic polyester resin that forms these absorbs ultraviolet rays, it prevents ultraviolet rays emitted from light sources such as liquid crystal display devices. Therefore, the film deteriorates and yellows, and the light reflectivity of the reflective film is reduced.
- Japanese Patent Application Laid-Open No. 11 174213 discloses a reflective film in which an inorganic filler is added to a polypropylene resin and a plastic such as a polypropylene resin is disclosed.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-138150
- Patent Document 2 Japanese Patent Laid-Open No. 239540
- Patent Document 3 Japanese Patent Application Laid-Open No. 11-174213
- the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to have excellent light reflectivity, and the light reflectivity can be lowered over time by use. There is no reflective film to provide.
- the aliphatic polyester-based resin reflective film of the present invention is a reflective film formed from a resin composition containing an aliphatic polyester-based resin and a fine powder filler, and the yellowness (YI Value) is less than 3.6.
- the fine powder filler can be at least one selected from the group consisting of calcium carbonate, barium sulfate, titanium oxide, and oxide oxide.
- the titanium oxide preferably has a vanadium content of 5 ppm or less.
- the surface of the titanium oxide is preferably coated with at least one inert inorganic oxide selected from the group consisting of silica, alumina, and zirconia.
- the content of the fine powder filler is 10% by mass or more and 60% by mass in the resin composition.
- the aliphatic polyester resin may have a refractive index of less than 1.52.
- the aliphatic polyester resin is preferably a lactic acid polymer.
- the aliphatic polyester resin may have a yellowness (YI value) of 20 or less.
- the aliphatic polyester resin reflective film of the present invention has a porosity of 50 inside the film.
- It can have voids so as to be not more than%.
- the ability to stretch a film formed by melt-forming a resin composition containing an aliphatic polyester resin and the fine powder filler at least 1.1 times in one axial direction S can.
- the reflectance of the film surface with respect to light having a wavelength of 550 nm is preferably 95% or more.
- an aliphatic polyester-based reflective film in which the resin composition may further contain a hydrolysis inhibitor composed of an aliphatic carpositimide compound may be formed with this resin composition strength.
- the hydrolysis inhibitor may be a carpositimide compound containing an isocyanate group at a terminal.
- the content of the hydrolysis inhibitor may be in the range of 0.1 parts by mass or more and 3.0 parts by mass or less with respect to 100 parts by mass of the aliphatic polyester resin.
- the aliphatic polyester resin reflective film of the present invention has a reflectivity of 95 on the film surface with respect to light having a wavelength of 450 nm. Can be greater than or equal to 0 .
- the reflecting plate of the present invention includes any one of the above aliphatic polyester resin reflecting films.
- the reflector can be used in a liquid crystal display device, a lighting fixture, or a lighting signboard.
- the reflective film has high light reflectivity and does not deteriorate with time. Rum can be obtained. Further, by coating the reflective film of the present invention on a metal plate or a resin plate, an excellent reflective plate used for a liquid crystal display device, a lighting fixture, a lighting signboard, etc., which is well balanced with respect to characteristics such as light reflectivity. Obtainable. BEST MODE FOR CARRYING OUT THE INVENTION
- the sheet means a product that is thin and generally flat in terms of the length and width, as defined by JIS.
- a film is a thin flat product whose thickness is extremely small compared to the length and width and whose maximum thickness is arbitrarily limited, and is usually supplied in the form of a roll (Nippon Kogyo). Standard JIS K 6900). Therefore, it can be said that a sheet having a particularly thin thickness is a film. Since the boundary between the sheet and the film is fixed, it is difficult to clearly distinguish the sheet. Even if it is referred to as “sheet”, it shall include “film”.
- the aliphatic polyester resin reflective film of the present invention is formed from a resin composition containing an aliphatic polyester resin and a fine powder filler as main components.
- the aliphatic polyester resin reflective film has a yellowness (YI value) of less than 3.6 and preferably less than 3.5. If the yellowness is less than 3.6, a liquid crystal display or the like in which this reflection film is incorporated will have a fine color without causing the screen to become yellowish.
- the yellowness (YI value) of the film may be adjusted by any method as long as it is less than 3.6.
- the yellowness of the film is, for example, an aliphatic polyester resin reflective film. It is considered that it varies depending on the type of base resin that forms the film, the type and amount of impurities, metals, etc. contained in the film.
- the base resin preferably has a yellowness (YI value) of 20 or less. If a reflective film is formed using such a base resin, it is easy to make the yellowness of the reflective film less than 3.6.
- the yellowness (YI value) depends on the measurement method (measurement method)
- the thickness is reduced, the reflectance generally decreases.
- the yellowness (YI value) can be lowered to improve the color clarity and improve the reflectance.
- the base resin constituting the reflective film of the present invention preferably has an index of refraction ( ⁇ ) of less than 1.52. It is preferable to use a resin.
- a reflective film containing a fine powder filler in the film exhibits light reflectivity by utilizing refractive scattering at the interface between the base resin and the fine powder filler.
- This refractive scattering effect increases as the difference in refractive index between the base resin and the fine powder filler increases.
- the refractive index difference is preferably 0.15 or more, more preferably 0.20 or more. Therefore, as the base resin, it is preferable to use a resin having a low refractive index so that the refractive index difference from the fine powder filler is large. It is easy to secure a refractive index difference of 0.15 or more.
- an aliphatic polyester having a refractive index of less than 1.52 rather than an aromatic polyester having an aromatic ring and having a refractive index of about 1.55 or more. It is preferable to use a small lactic acid polymer (refractive index of less than 1.46).
- the aliphatic polyester resin does not contain an aromatic ring in the molecular chain, it does not absorb ultraviolet rays. Therefore, the reflective film is not deteriorated or yellowed by being exposed to ultraviolet light or by ultraviolet light emitted from a light source such as a liquid crystal display device, so that the reflectance of the film does not decrease. Les.
- Chemically synthesized aliphatic polyester resins include poly ⁇ -force prolatatam obtained by ring-opening polymerization of rataton, such as polyethylene adipate, polyethylene azelate, polyalysate obtained by polymerizing dibasic acid and diol.
- ester bonds of the above aliphatic polyesters such as tetramethylene succinate, cyclohexane dicarboxylic acid / cyclohexane dimethanol condensation polymer, polylactic acid obtained by polymerizing hydroxycarboxylic acid, polyglycol, etc.
- ester bonds include aliphatic polyesters in which 50% or less of the ester bonds are replaced with amide bonds, ether bonds, urethane bonds, and the like.
- aliphatic polyester fermented and synthesized by microorganisms examples include polyhydroxybutyrate, a copolymer of hydroxybutyrate and hydroxyvalylate, and the like.
- the lactic acid-based polymer refers to a homopolymer of D lactic acid or L lactic acid or a copolymer thereof, and specifically, a poly (D_ Lactic acid), poly (L-lactic acid) whose structural unit is L-monolactic acid, and poly (DL-lactic acid), which is a copolymer of L-lactic acid and D-lactic acid, and mixtures thereof are also included .
- the lactic acid-based polymer can be produced by a known method such as a condensation polymerization method or a ring-opening polymerization method.
- a condensation polymerization method D_lactic acid, L_lactic acid, or a mixture thereof can be directly subjected to dehydration condensation polymerization to obtain a lactic acid polymer having an arbitrary composition.
- lactide which is a cyclic dimer of lactic acid, is subjected to ring-opening polymerization in the presence of a predetermined catalyst while using a polymerization regulator or the like, if necessary.
- An acid polymer can be obtained.
- lactides include L-latide, which is a dimer of L-lactic acid, D-lactide, which is a dimer of D-lactic acid, and DL-lactide, which is a dimer of D-lactic acid and L-lactic acid.
- L-latide which is a dimer of L-lactic acid
- D-lactide which is a dimer of D-lactic acid
- DL-lactide which is a dimer of D-lactic acid and L-lactic acid.
- a lactic acid polymer having a composition ratio of D lactic acid to L lactic acid of 100: 0 or 0: 100 exhibits very high level and crystallinity, and tends to have excellent heat resistance and mechanical properties with a high melting point. is there. That is, when the film is stretched or heat-treated, the resin is crystallized to improve heat resistance and mechanical properties, which is preferable.
- the lactic acid polymer is a mixture of L-lactic acid and D-lactic acid to form three types of dimers, LL-lactide, DL lactide, and DD lactide. Therefore, when polymerization is carried out at 260 ° C using tin octylate as a catalyst, LL-lactide and DD-lactide become polymers. DL-lactide remains as the remaining sample. This remaining DL-lactide is used for the next polymerization.
- the D form is discolored due to an excessive thermal history due to composition adjustment during polymerization. Therefore, if there is a lot of heat history, the degree of discoloration of D-form will also increase, and as a result, the yellowness of the resulting polymer will increase. Therefore, in order to reduce the yellowness (YI value) of poly (L-lactic acid) -based lactic acid polymers to 20 or less, it is desirable that the content of D-form is low. By making the molar ratio of less than 2.2%, a yellowness (YI value) of 20 or less can be achieved. The same applies to the content of L-form in the case of poly (D-lactic acid), and the molar ratio of L_lactic acid is preferably less than 2.2%.
- lactic acid yellowness examples include residual catalyst, monomer purity, oligomer, iron, zinc, and other metal components.
- a yellow acid (YI) can be reduced by washing a lactate polymer having a high yellowness (YI) with a solvent such as acetone. This is probably due to the elution of components such as residual catalyst.
- lactic acid polymers having different copolymerization ratios of D lactic acid and L lactic acid may be blended.
- the average value of the copolymerization ratios of D lactic acid and L lactic acid of a plurality of lactic acid polymers should be within the above range.
- the lactic acid polymer used in the present invention preferably has a high molecular weight.
- the weight average molecular weight is preferably 10,000 or more, more preferably 50,000 or more. It is even more preferable that it is 10,000 or more. Particularly preferable is 100,000 or more.
- the weight average molecular weight of the lactic acid polymer is preferably 400,000 or less, and particularly preferably 300,000 or less. Film obtained when the weight average molecular weight of the lactic acid polymer is less than 10,000 May have poor mechanical properties.
- the resin composition forming the reflective film of the present invention contains a fine powder filler.
- the fine powder filler used in the present invention include organic fine powder and inorganic fine powder.
- the organic fine powder it is preferable to use at least one selected from the group consisting of cellulose powder such as wood powder and pulp powder, polymer beads, polymer hollow particles and the like.
- Examples of the inorganic fine powder include calcium carbonate, magnesium carbonate, barium carbonate, magnesium sulfate, barium sulfate, calcium sulfate, titanium oxide, zinc oxide, magnesium oxide, calcium oxide, anolemina, aluminum hydroxide, hydroxyapatite, It is preferable to use at least one selected from the group consisting of silica, my strength, talc, kaolin, clay, glass powder, asbestos powder, zeolite, silicate clay, and the like.
- a film having a large difference in refractive index from the base resin constituting the film that is, use of an inorganic fine powder having a large refractive index.
- an inorganic fine powder having a large refractive index is preferred.
- Titanium oxide can increase the difference in refractive index from the base resin having a high refractive index. Therefore, the film has a high reflection performance with a smaller blending amount than when a filler other than titanium oxide is used. Low light transmittance can be imparted. If titanium oxide is used, a film having high reflection performance and low light transmission can be obtained even if the film is thin.
- titanium oxide used in the present invention examples include titanium oxide having a crystal structure such as anatase type and rutile type. From the viewpoint of increasing the difference in refractive index with the base resin constituting the film, it is preferable that the refractive index is 2.7 or more. For example, titanium oxide having a rutile crystal structure is used. It is preferable. The greater the difference in refractive index, the greater the light scattering action at the interface between the base resin and titanium oxide, and the light reflectivity can be easily imparted to the film.
- titanium oxide that has a low light absorption capability for visible light.
- the amount of coloring elements contained in titanium oxide is small. For example, if titanium oxide having a vanadium content of 5 ppm or less is used, a reflective film having high light reflectivity can be obtained. From the viewpoint of reducing the light absorption ability, it is preferable that the coloring elements contained in titanium oxide, such as iron, niobium, copper, and manganese, are also small.
- Titanium oxide produced by the chlorine process has high purity. According to this production method, titanium oxide having a vanadium content of 5 ppm or less can be obtained.
- rutile ore containing titanium oxide as the main component is first reacted with chlorine gas in a high-temperature furnace at about 1,000 ° C to produce titanium tetrachloride. Subsequently, high purity titanium oxide can be obtained by burning this titanium tetrachloride with oxygen.
- sulfuric acid process as an industrial production method of titanium oxide. Titanium oxide obtained by this method contains many colored elements such as vanadium, iron, copper, manganese, niobium, etc. Increases light absorption.
- the surface of the titanium oxide used in the present invention is preferably coated with an inert inorganic oxide.
- an inert inorganic oxide By coating the surface of titanium oxide with an inert inorganic oxide, the photocatalytic activity of titanium oxide can be suppressed, and the light resistance of the film can be increased.
- the inert inorganic oxide it is preferable to use at least one selected from the group consisting of silica, alumina, and dinoleconia. If these inert inorganic oxides are used, the light resistance of the film can be enhanced without impairing the high light reflectivity exhibited when titanium oxide is used. In addition, it is more preferable to use two or more kinds of inert inorganic oxides in combination, and a combination in which silica is essential is particularly preferable.
- the surface of the titanium oxide is at least one inorganic compound selected from the group consisting of siloxane compounds, silane coupling agents, and the like, polyols Surface treatment with at least one organic compound selected from the group consisting of polyethylene glycol, amine compounds, fatty acids, fatty acid esters, etc. You may make sense.
- the titanium oxide used in the present invention preferably has a particle size of 0.1 / im or more and 1 / im or less, and is 0.2 ⁇ or more and 0.5 / im or less. More preferred.
- the particle size of titanium oxide is 0.1 l ⁇ m or more, the dispersibility in the aliphatic polyester resin is good, and a uniform film can be obtained.
- the particle size of titanium oxide is 1 zm or less, the interface between the aliphatic polyester resin and titanium oxide is densely formed, so that high reflection and light reflectivity can be imparted to the reflective film. it can.
- a silicone compound, a polyhydric alcohol compound, an amine compound is used.
- Surface treatment can be performed with fatty acids, fatty acid esters, and the like. Further, the surface is preferably coated with an inert inorganic oxide.
- the fine powder filler preferably has an average particle size of 0.05 am or more and 15 ⁇ m or less, more preferably an average particle size of 0.1 / m or more and 10 / m. It is as follows. If the average particle size of the fine powder filler is 0.05 / im or more, light scattering reflection occurs with the roughening of the film, so that the reflection directivity of the obtained film becomes small. If the average particle size of the fine powder filler is 15 ⁇ m or less, the interface between the aliphatic polyester resin and the fine powder filler is densely formed, so that the reflective film has high light reflectivity. Can do.
- inorganic fine powder and organic fine powder may be used in combination as the fine powder filler.
- fine powder fillers can be used together.
- titanium oxide and other fine powder fillers, titanium oxide having a vanadium content of 5 ppm or less, and other fine powder fillers may be used in combination.
- the fine powder filler such as titanium oxide is preferably dispersed and blended in the aliphatic polyester resin.
- the content of the fine powder filler is 10% by mass or more in the resin composition for forming the reflective film, considering the light reflectivity of the film, mechanical properties, productivity, and the like. It is preferably 60% by mass or less, more preferably 10% by mass or more and less than 55% by mass, even more preferably 20% by mass or more and 50% by mass or less. If the content of the fine powder filler is 10% by mass or more in the resin composition, the area of the boundary surface between the resin and the fine powder filler can be sufficiently secured, so that the reflection film is high. Light reflectivity can be imparted. Further, if the content of the fine powder filler is 60% by mass or less, the mechanical properties necessary for the film can be ensured.
- the aliphatic polyester resin reflective film of the present invention preferably has voids in the film in view of reflectance.
- the porosity of the film (the ratio of voids occupied in the film) is preferably 50% or less, more preferably 5% or more and 50% or less. In particular, the porosity is preferably 20% or more and most preferably 30 from the viewpoint of improving the reflectance. More than / o. If the porosity exceeds 50%, the mechanical strength of the film may decrease, and the film may break during film production, or durability such as heat resistance may be insufficient during use. For example, voids can be formed inside the film by adding a fine powder filler and stretching.
- titanium oxide it is possible to achieve high light reflectivity even if the porosity existing inside the film is low. This is presumably due to the high refractive index of titanium oxide and high hiding power. Also, if the amount of filler used can be reduced, the number of voids formed by stretching will also be reduced. Therefore, if titanium oxide is used, the number of voids present in the film can be reduced, so that the mechanical properties of the film can be improved while maintaining high reflection performance. Alternatively, even when the amount of filler used is large, mechanical properties can be improved as in the case where the amount of filler used is reduced by reducing the stretch amount and reducing the number of voids.
- reducing the number of voids present in the film is advantageous in terms of improving the dimensional stability of the film. If high reflection performance is ensured even with a thin wall, it can be used, for example, as a reflective film for small and thin liquid crystal displays such as notebook computers and mobile phones.
- the porosity 20% or more.
- the porosity is sufficiently high even if it is 15% or less.
- the light reflectance can be achieved. If titanium oxide having a vanadium content of 5 ppm or less is used, high light reflectivity can be achieved even if the porosity existing inside the film is low. For example, there is no void inside the film. Even high light reflectivity can be achieved. Note that a reflective film that uses titanium oxide with a vanadium content of 5 ppm or less and that has voids can achieve particularly high reflectivity. wear.
- the aliphatic polyester-based resin reflective film preferably has an average surface reflectance of 90% or more in the wavelength region of light having a wavelength of 420 nm to 70 Onm of 95% or more. More preferably. If this average reflectance is 90% or more, the reflective film exhibits good reflective properties, and a liquid crystal display or the like incorporating this reflective film can achieve a sufficiently bright screen.
- the aliphatic polyester resin reflective film has a surface reflectance of 95 with respect to light having a wavelength of 550 nm. Preferably it is at least 0, more preferably at least 97%. Reflectivity is 95. If it is greater than or equal to 0 , the reflective film exhibits good reflective properties, and a liquid crystal display or the like incorporating this reflective film has good color clarity without causing the screen to become yellowish.
- the aliphatic polyester resin reflective film preferably has a surface reflectivity of 95% or more with respect to light having a wavelength of 450 nm, more preferably 98% or more. If this reflectivity is 95% or more, the reflective film exhibits good reflective characteristics, and a liquid crystal display or the like incorporating this reflective film can realize a sufficiently bright screen.
- the reflectance of the surface with respect to light having a wavelength of 450 nm is 94% or more even after being exposed to ultraviolet rays or left in an atmosphere of 70 ° C. or higher. More preferably, it is at least%.
- the film When the film is yellowish, it absorbs light at 450 nm, so that the reflectivity for light with a wavelength of 450 nm is significantly reduced.
- the film when an aliphatic carbodiimide compound is used as a hydrolysis inhibitor, the film does not deteriorate even after being exposed to ultraviolet rays or left in an atmosphere of 70 ° C. or higher, and the yellowness changes. Since the degree is small, the decrease in reflectance at a wavelength of 450 nm is small.
- the reflective film preferably retains excellent reflectance even after being exposed to ultraviolet rays.
- the aliphatic polyester resin reflective film of the present invention uses an aliphatic polyester resin that does not contain an aromatic ring in the molecular chain as the base resin. High reflectivity can be maintained.
- liquid crystal displays have come to be used for car navigation systems for automobiles, small-sized TVs for vehicles, etc. in addition to displays for personal computers, and those that can withstand high temperatures and high humidity are required. It has become. For this reason, it is preferable to add an anti-hydrolysis agent to the aliphatic polyester resin reflective film for the purpose of imparting durability.
- Examples of the hydrolysis inhibitor preferably used in the present invention include a carpositimide compound.
- a carpositimide compound for example, a compound having a basic structure represented by the following general formula, which is preferably composed of an aliphatic carpositimide compound, is preferable.
- n represents an integer of 1 or more, and R represents an organic bond unit.
- R can be either aliphatic, alicyclic, or aromatic.
- n is usually an appropriate integer between 1 and 50. when n is 2 or more, 2 or more R may be the same or different
- a monomer is mentioned as a carpositimide compound.
- carpositimide compounds may be used alone or in combination of two or more.
- a trade name “Calpolite HM V — 8CA” manufactured by Nisshinbo Co., Ltd. can be obtained commercially.
- the carpositimide compound can be controlled to an appropriate degree of polymerization by stopping the polymerization reaction in the middle by cooling or the like.
- the terminal is an isocyanate.
- the calpositimide compound used in the present invention is a carpositimide compound having an isocyanate group at the terminal (hereinafter sometimes referred to as “calpositimide-modified isocyanate”). Tetsuyore.
- calpositimide-modified isocyanate for example, trade name “Calpolite LA-1” manufactured by Nisshinbo Co., Ltd. can be obtained commercially.
- the calpositimide compound in an amount of 0.:! To 3.0 parts by mass with respect to 100 parts by mass of the aliphatic polyester resin constituting the film.
- the addition amount of the carpositimide compound is 0.1 parts by mass or more, the effect of improving the hydrolysis resistance is sufficiently exhibited in the obtained film.
- the amount of the calpositimide compound added is 3.0 parts by mass or less, the resulting film has a low degree of coloration and high light reflectivity, and moreover, yellowing over time is less likely to occur. High light reflectivity can be maintained.
- the film may shrink over time when used at high temperatures, and if the reflective film is laminated on a steel plate, etc., only the film It may be deformed. Films that have undergone large shrinkage have a reduced reflectivity because the surface that promotes reflection becomes smaller and the voids inside the film become smaller.
- the reflection sheet may be required to be increased in size.
- the reflection sheet when it is incorporated as a reflective sheet for a large-screen LCD TV, etc., it will be used for a long time while exposed to a light source, so it will be used for a long time.
- a reflective film that does not cause dimensional changes even when used.
- a reflective film with a small dimensional change is required when the edge is restricted even when it is incorporated in a medium-sized or small-sized edge light type display.
- the heat shrinkage rate after being held at 80 ° C for 180 minutes is less than 0.7% greater than 0% in the vertical direction, and -0.1% or more and 0.5% or less in the horizontal direction.
- the shrinkage in the lateral direction is more preferably 0.001% or more and 0.3% or less.
- the longitudinal direction refers to the same direction as the film flow direction (film take-up direction)
- the horizontal direction refers to the direction perpendicular to the film flow direction.
- the thermal shrinkage of the aliphatic polyester-based resin reflective film is within the above range, the flatness of the film that does not deform over time even when used on the back of a large-sized liquid crystal television or the like can be obtained.
- a reflective film after the film is stretched, it is subsequently subjected to a relaxation treatment at the tenter outlet to give a predetermined amount of relaxation, thereby holding the aliphatic polyester resin reflective film at 80 ° C. for 180 minutes.
- the thermal contraction rate after the treatment can be made within the above range.
- an antioxidant a light stabilizer, a heat stabilizer, a lubricant, a dispersant, an ultraviolet absorber, a white pigment, a fluorescent whitening agent, and Other additives can be added.
- the aliphatic polyester resin reflective film of the present invention can be decomposed by microorganisms and the like when disposed in landfills, and does not cause various problems associated with disposal. Aliphatic polyester resins are hydrolyzed by microorganisms in the soil due to hydrolysis of the ester bond in the soil, resulting in a molecular weight reduction of about 1,000.
- the aromatic polyester resin has a high intramolecular bond stability, and hydrolysis of the ester bond portion hardly occurs. Therefore, aromatic polyester resins do not decrease in molecular weight even when they are carried in soil, and biodegradation by microorganisms does not occur. As a result, problems such as remaining in the soil over a long period of time, promoting the shortening of the landfill site for waste, and damaging the natural landscape and the living environment of wild animals and plants occur.
- a fine powder filler is blended with the aliphatic polyester resin, and further, a hydrolysis inhibitor, other additives, and the like are blended as necessary to prepare a resin composition. Specifically, a fine powder filler is added to the aliphatic polyester resin, a hydrolysis inhibitor is added as necessary, and the mixture is mixed with a ribbon blender, tumbler, Henschel mixer, etc., and then a Banbury mixer.
- the resin composition can be obtained by kneading at a temperature equal to or higher than the melting point of the resin (for example, 170 ° C. to 230 ° C. in the case of polylactic acid) using a single screw or twin screw extruder.
- a resin composition can be obtained by adding a predetermined amount of an aliphatic polyester-based resin, a fine powder filler, a hydrolysis inhibitor, or the like with a separate feeder or the like.
- a so-called master batch in which a fine powder filler, a hydrolysis inhibitor, etc. are blended in a high concentration in an aliphatic polyester resin is prepared in advance, and the master batch is mixed with an aliphatic polyester resin.
- a resin composition having a desired concentration can also be obtained.
- the resin composition thus obtained is melted to form a film.
- the resin composition is supplied to an extruder and heated to a temperature equal to or higher than the melting point of the resin to be melted.
- the resin composition may be supplied to the extruder without being dried, but if not dried, it is preferable to use a vacuum vent during melt extrusion.
- Conditions such as the extrusion temperature need to be set in consideration of a decrease in molecular weight due to decomposition.For example, in the case of polylactic acid, the extrusion temperature is in the range of 170 ° C to 230 ° C. Is preferred.
- the melted resin composition is extruded from the slit-shaped discharge port of the T die, and is closely adhered to the cooling roll to form a cast sheet.
- the reflective film of the present invention is at least 1.1 times in at least one axial direction after being melt-formed using a resin composition obtained by mixing an aliphatic polyester resin and a fine powder filler. It is preferable to be stretched. By stretching, voids having fine powder fillers as nuclei are formed inside the film, so that the light reflectivity of the film can be further improved. This is presumably because the interface between the resin and the void and the interface between the void and the fine filler are newly formed, and the effect of refraction and scattering generated at the interface is increased.
- the reflective film of the present invention is preferably stretched 5 times or more as an area magnification, and more preferably 7 times or more. Make sure that the area magnification is 5 times or more.
- a porosity of 5% or more can be achieved inside the film, and by stretching 7 times or more, a porosity of 20% or more can be achieved, and 7.5 times or more can be stretched. By doing so, a porosity of 30% or more can also be realized.
- the stretching temperature at which the cast sheet is stretched is preferably within the range of the glass transition temperature (Tg) of the resin to (Tg + 50 ° C). It is preferably 50 ° C or higher and 90 ° C or lower. When the stretching temperature is within this range, the film can be stably carried out without breaking during stretching, and the stretching orientation is increased, resulting in an increase in the porosity, so that the film having a high reflectance is obtained. Is easy to obtain.
- the aliphatic polyester-based resin reflective film of the present invention is formed by, for example, appropriately selecting a stretching ratio and stretching to form voids in the film.
- the drawing behavior of resin and fine powder filler such as titanium oxide is different. In other words, if stretching is performed at a stretching temperature suitable for an aliphatic polyester resin, the aliphatic polyester resin that becomes a matrix is stretched, but the fine powder filler is left as it is. The interface between the resin and the fine powder filler is peeled off to form voids.
- the reflective film of the present invention is preferably further stretched in the biaxial direction.
- the porosity is further increased, and the light reflectivity of the film can be further enhanced.
- the voids that can be formed must be in the form of fibers extending in one direction, but by biaxially stretching, the voids are disk-like in both longitudinal and lateral directions. Become a form. That is, by biaxial stretching, the peeled area at the interface between the resin and the fine powder filler increases, and the whitening of the film proceeds. As a result, the light reflectivity of the film can be improved. Furthermore, since biaxial stretching eliminates anisotropy in the shrinking direction of the film, the heat resistance of the reflective film can be improved, and the mechanical strength of the film can be increased.
- the stretching order of biaxial stretching is not particularly limited. For example, simultaneous biaxial stretching or sequential stretching may be used. After film formation using a stretching facility, the film is stretched in the MD (film take-off direction) by roll stretching, and then TD (direction perpendicular to the MD) by tenter stretching. ) Or biaxial stretching by tubular stretching or the like.
- the processing temperature for heat-setting the film is preferably 90 to 160 ° C, and more preferably 110 to 140 ° C.
- the treatment time required for heat setting is preferably 1 second to 5 minutes.
- tenter stretching that can be heat-set after stretching.
- the thickness of the aliphatic polyester resin reflective film of the present invention is not particularly limited, but is usually 30 ⁇ m to 500 ⁇ m, and considering the handleability in practical use, it is about 50 ⁇ m to 500 zm. It is preferable to be within the range. Especially for reflective films for small and thin reflectors, the thickness is 30 ⁇ ! Preferable to be ⁇ 100 ⁇ m. If a reflective film having such a thickness is used, it can be used for small and thin liquid crystal displays such as notebook computers and mobile phones.
- the reflective film of the present invention may have a single-layer structure, or a multilayer structure in which two or more layers are laminated.
- a reflection plate that can be used in a liquid crystal display or the like by using the aliphatic polyester resin reflection film of the present invention can be formed.
- a reflection plate can be formed by coating an aliphatic polyester resin reflection film on a metal plate or a resin plate.
- This reflector is useful as a reflector used in liquid crystal display devices, lighting fixtures, lighting signs, and the like. Below, an example is given and demonstrated about the manufacturing method of such a reflecting plate.
- a method of coating the reflective film on a metal plate or a resin plate a method of using an adhesive, a method of heat-sealing without using an adhesive, a method of bonding via an adhesive sheet, extrusion coating There is a method for doing so, and it is not particularly limited.
- a reflective film can be bonded by applying a polyester-based, polyurethane-based, or epoxy-based adhesive to the surface of the metal plate or resin plate on the side where the reflective film is bonded.
- commonly used coating equipment such as reverse roll coater and kiss roll coater is used, and the adhesive film thickness after drying is 2-4 zm on the surface of the metal plate etc. where the reflective film is bonded. Apply an adhesive to a degree.
- the coated surface is dried and heated with a wire heater and a hot-air heating furnace, and while maintaining the surface of the plate at a predetermined temperature, a reflecting film is immediately coated and cooled using a roll laminator to obtain a reflecting plate.
- a reflecting film is immediately coated and cooled using a roll laminator to obtain a reflecting plate.
- the surface temperature of the metal plate or the like is preferably 160 ° C or higher.
- the reflective film is required to have good shape-retaining properties that exhibit the property of retaining the shape when folded.
- the conventional reflective film has a drawback of poor shape retention, according to the present invention, a reflective film having excellent shape retention can be realized.
- the present invention will be described more specifically with reference to the following examples. However, the present invention is not limited to these examples, and various applications are possible without departing from the technical idea of the present invention. is there.
- the measured value and evaluation which are shown to an Example were performed as shown below.
- MD film take-up
- TD orthogonal direction
- the refractive index of the resin was measured based on A method of JIS K — 7142.
- Titanium oxide was decomposed with hydrofluoric acid in a microwave sample decomposition apparatus, and the obtained solution was quantitatively analyzed using an ICP emission spectrometer.
- Yellowness was measured based on JIS K-7103. The measurement was performed using a spectrocolorimeter (“SC_T”, manufactured by Suga Test Instruments Co., Ltd.). The yellowness was measured not only for the reflective film but also for the base resin.
- SC_T spectrocolorimeter
- the reflectance of the reflective film (reflective film after UV irradiation) after irradiating the film with ultraviolet rays for 1,000 hours in a sunshine weather meter tester (without intermittent spraying of water) was also the same as above.
- the decrease in reflectance (A R) after UV irradiation was determined based on the following formula.
- ⁇ R reflectivity before UV irradiation-reflectivity after UV irradiation
- An integrating sphere is attached to a spectrophotometer (“U-4000”, manufactured by Hitachi, Ltd.), and measurements are made at intervals of 20 nm over wavelengths from 420 nm to 700 nm. The average value of the measured values obtained was calculated, and this value was defined as the average reflectance at a wavelength of 420 to 700 nm. Before the measurement, a photometer was set so that the reflectance of the white alumina plate was 100%.
- the film is allowed to stand for 300 hours or 1000 hours in a constant temperature and humidity chamber maintained at a temperature of 60 ° C and a relative humidity of 95% RH, and then the weight of the aliphatic polyester resin constituting the film is measured. The average molecular weight was measured. The measured value was substituted into the following formula to determine the molecular weight retention rate (%), and the hydrolysis resistance was evaluated based on the following evaluation criteria. However, the symbols “ ⁇ ” and “ ⁇ ” are above the practical level.
- the reflectance (%) of the film after ultraviolet irradiation was also measured according to the measurement method (i) of (6) above.
- Shape retention was evaluated by a deadfold property test shown below.
- a sample film having a width of 20 mm and a length of 150 mm is cut out with the longitudinal direction of the film as the width direction and the orthogonal direction as the length direction. Hold one short side of this sample film and the other short side (the other end) that is not held at a position 30mm from the other end. Bend it 180 degrees so that a load of 0.15 MPa is applied. 0.1 After applying a load of 15 MPa for 0.5 seconds, immediately remove the load, open the folded part, return the other end to the original position by hand, release the hand, and hold the bending angle Measure. In other words, measure the angle away from the original position S when the hand is released. This value is 180 degrees at the maximum and 0 degree at the minimum. The larger the value, the better the dead-fold property, that is, the shape retention.
- the reflectance (%) of the reflector was measured according to the measurement method (i) in (6) above.
- the film was placed in a hot air circulating oven at a temperature of 80 ° C. and held for 500 hours, and then the reflectance (%) was determined according to the method of (ii) in (6) above.
- the measured reflectance value was substituted into the following equation to obtain the reflectance retention rate (%), and the heat resistance was evaluated based on the following evaluation criteria.
- Reflectivity retention rate (%) (Reflectance after leaving / Reflectance before leaving) X 100
- Lactic acid-based polymer having a weight average molecular weight of 200,000 (NW4032D: Cargill Dow Polymer Co., Ltd., D-form content: 1.5%) and titanium oxide having an average particle size of 0.25 / im (Typeta PF-711; Ishihara Sangyo Co., Ltd.) was mixed at a ratio of 50% by mass / 50% by mass to form a mixture.
- a hydrolysis inhibitor bis (dipropylphenol) carpositimide
- the molten resin composition was extruded into a sheet using a T-die and cooled and solidified to form a film.
- the resulting film is 2.5 times MD and TD at 65 ° C. 2.
- the film was stretched biaxially 8 times and then heat treated at 140 ° C to obtain a reflective film with a thickness of 250 ⁇ .
- the resulting reflective film was measured and evaluated for yellowness (YI), porosity, reflectance before UV irradiation (i), color and reflectance after UV irradiation, hydrolysis resistance, and shape retention. .
- the results are shown in Table 2.
- the yellowness (YI value) of the base resin and the yellowness (YI value) of the reflective film were the values shown in Table 1.
- Example 1 instead of titanium oxide having an average particle size of 0.25 xm (Tyvek PF_711; manufactured by Ishihara Sangyo Co., Ltd.), the average particle size was 0.24 zm.
- a reflective film having a thickness of 250 zm was obtained in the same manner as in Example 1 except that titanium oxide (Typeter R-630; manufactured by Ishihara Sangyo Co., Ltd.) was used. About the obtained reflective film, the same measurement and evaluation as Example 1 were performed. The results are shown in Table 2.
- the yellowness (YI value) of the base resin and the yellowness (YI value) of the reflective film were the values shown in Table 1.
- Example 1 instead of titanium oxide having an average particle size of 0.25 ⁇ (Taibake PF-711; manufactured by Ishihara Sangyo Co., Ltd.), the average particle size is 0 ⁇ Using 7 / m barium sulfate (B-55; manufactured by Zihi Gaku Kogyo Co., Ltd.), the blending amount of masterbatch and lactic acid polymer was mixed at a ratio of 60% by mass: 40% by mass. A reflective film having a thickness of 250 ⁇ was obtained in the same manner as in Example 1 except that the resin composition was prepared. The obtained reflective film was measured and evaluated in the same manner as in Example 1. The results are shown in Table 2. The yellowness (YI value) of the base resin and the yellowness (YI value) of the reflective film were the values shown in Table 1.
- Example 1 instead of titanium oxide having an average particle size of 0.25 xm (Tyvek PF_711; manufactured by Ishihara Sangyo Co., Ltd.), the average particle size was 0.15 zm.
- a reflective film having a thickness of 250 zm was obtained in the same manner as in Example 1 except that calcium carbonate (StaVigot — 15A; manufactured by Shiraishi Calcium Co., Ltd.) was used. About the obtained reflective film, the same measurement and evaluation as Example 1 were performed. The results are shown in Table 2.
- the yellowness (YI value) of the base resin and the yellowness (YI value) of the reflective film were the values shown in Table 1.
- Example 5 As shown in Table 1, a reflective film having a thickness of 188 ⁇ was obtained in the same manner as in Example 1 except that the sheet thickness was changed from 250 / im to 188 / im. The obtained reflective film was measured and evaluated in the same manner as in Example 1. The results are shown in Table 2. The yellowness (YI value) of the base resin and the yellowness (YI value) of the reflective film were the values shown in Table 1.
- Example 1 instead of stretching 2.5 times to MD and 2.8 times to TD, biaxial stretching was performed 3 times to MD and 3.2 times to TD, and the sheet thickness was changed to 100 xm.
- a reflective film having a thickness of 100 xm was obtained in the same manner as in Example 1.
- the obtained reflective film was measured and evaluated in the same manner as in Example 1. The results are shown in Table 2.
- the yellowness (haze) of the base resin and the yellowness (haze) of the reflective film were the values shown in Table 1.
- Example 1 instead of pellets of polylactic acid polymer (NW4032D) having a weight average molecular weight of 200,000, polylactic acid polymer having a weight average molecular weight of 200,000 (NW5040D; Cargill Dow A reflective finole having a thickness of 250 / im was obtained in the same manner as in Example 1 except that pellets having a D-form content of 2.2% manufactured by Polymer Co., Ltd. were washed with acetone. The obtained reflection film was measured and evaluated in the same manner as in Example 1. The results are shown in Table 2. The yellowness (YI value) of the base resin and the yellowness (YI value) of the reflective film were the values shown in Table 1.
- Example 1 As shown in Table 1, in Example 1, instead of a lactic acid polymer (NW4032D: manufactured by Cargill Dow Polymer), a lactic acid polymer having a weight average molecular weight of 200,000 (NW5040D: manufactured by Gildau Polymer Co., Ltd.) A reflective film having a thickness of 250 xm was obtained in the same manner as in Example 1 except that pellets having a D-form content of 2.2% were used. About the obtained reflective film, the same measurement and evaluation as Example 1 were performed. The results are shown in Table 2.
- NW4032D manufactured by Cargill Dow Polymer
- NW5040D manufactured by Gildau Polymer Co., Ltd.
- the yellowness (haze) of the base resin and the yellowness (haze) of the reflective film were the values shown in Table 1.
- Example 2 As shown in Table 1, in Example 2, a lactic acid polymer (NW4032D: Cargill Daupo Example 2 except that pellets of lactic acid-based polymer (NW5040D: made by Kiichi Gildau Polymer Co., Ltd., D-form content 2.2%) having a weight average molecular weight of 200,000 were used instead of Rimmer) Similarly, a reflective film having a thickness of 250 ⁇ was obtained. About the obtained reflective film, the same measurement and evaluation as Example 1 were performed. The results are shown in Table 2.
- the yellowness (YI value) of the base resin and the yellowness (YI value) of the reflective film were the values shown in Table 1.
- the reflective film obtained in Example 1 was coated with a zinc plated steel plate (thickness 0.45 mm) to produce a reflective plate. That is, first, a commercially available polyester-based adhesive was applied to the surface of a zinc plated steel plate on which a reflective film was bonded so that the adhesive film thickness after drying was about 2 to 4 zm. Next, the coated surface is dried and heated with an infrared heater and a hot-air heating furnace, and while maintaining the surface temperature of the steel sheet at 180 ° C, the reflective film is immediately coated and cooled using a roll laminator. Got. The obtained reflector was measured and evaluated for processability and reflectance. The results are shown in Table 3.
- Example 8 a reflecting plate was obtained in the same manner as in Example 8 except that the surface temperature of the steel sheet was kept at 220 ° C. instead of being kept at 180 ° C. The obtained reflector was measured and evaluated in the same manner as in Example 8. The results are shown in Table 3.
- Type PF 7 1 1 Rutile type crystalline titanium oxide manufactured by Ishihara Sangyo Co., Ltd.
- b Type P R630, Rutile type crystalline titanium oxide manufactured by Ishihara Sangyo Co., Ltd.
- c B-55; « Barium sulfate manufactured by Chemical Industry Co., Ltd.
- the reflective films of the present invention in Examples 1 to 7 have a yellow light (thin value) of less than 3.6 and a high light with a reflectance of 95% or more. It was found to have reflectivity and high color.
- the reflective films of Examples 1 to 7 have a reflectance of 93% or more even after the ultraviolet irradiation test, are evaluated to be white in color, and have excellent yellowing prevention properties. I understood. Among them, Example 1 and Examples 3 to 7 were excellent in that the reflectivity (initial reflectance) before ultraviolet irradiation was 97% or more and the reflectivity after ultraviolet irradiation was 95%.
- the films of Examples 1 to 7 also have a hydrolysis resistance higher than the practical level. That is, it was found that the reflective films of the invention of Examples:! To 7 gave excellent results in all evaluations.
- the reflective films of Comparative Examples 1 and 2 have a yellowness (low value) of 3.7 or more and a reflectance of
- a reflective film having excellent light reflectivity which does not turn yellow over time or does not deteriorate light reflectivity, and has excellent shape retention. can get.
- the reflective film of the present invention uses an aliphatic polyester resin as a base resin, it has biodegradability.
- Lactic acid-based polymer with a weight average molecular weight of 200,000 (NW4032D: Cargill Dow Polymer Co., Ltd., D-form content: 1.5%) and titanium oxide with an average particle size of 0.25 / im (Typeta PF 711; vanadium The content was 5 ppm or less, manufactured by Ishihara Sangyo Co., Ltd.) at a ratio of 50 mass% / 50 mass% to form a mixture.
- 3 parts by mass of carposimide modified isocyanate (Calpolite LA-1, Nisshinbo Co., Ltd.) was added and mixed as a hydrolysis inhibitor, and then pelleted using a twin screw extruder.
- This master batch and a lactic acid polymer were mixed at a ratio of 40% by mass / 60% by mass to prepare a resin composition. Thereafter, the resin composition was supplied to an extruder heated to 220 ° C.
- the molten resin composition was extruded into a sheet using a T-die and cooled and solidified to form a film.
- the obtained film was stretched biaxially at a temperature of 65 ° C, 2.5 times to MD and 2.8 times to TD, and then heat-treated at 140 ° C to obtain a reflective film having a thickness of 250 xm. .
- Measurement of porosity, average reflectance, reflectance before and after UV irradiation (ii), yellowness (YI value), yellowing prevention (color), hydrolysis resistance, and heat resistance of the resulting reflective film And evaluated. The results are shown in Table 4.
- the porosity of the reflective film was 14% [Example 2]
- Example 1 except that the type and amount of hydrolysis inhibitor in Example 1 were changed from 3 parts by weight of calpolite LA-1 to 1.5 parts by weight of aliphatic carpolite (carpolite HMV—8CA).
- a master batch was prepared, and then a resin composition was prepared to obtain a reflective film having a thickness of 250 xm.
- the obtained reflective film was measured and evaluated in the same manner as in Example 1. The results are shown in Table 4.
- the porosity of the reflective film is 14. /. Met.
- the reflective film obtained in Example 1 was coated with a zinc plated steel plate (thickness 0.45 mm) to produce a reflective plate. That is, first, a commercially available polyester-based adhesive was applied to the surface of a zinc plated steel plate on which a reflective film was bonded so that the adhesive film thickness after drying was about 2 to 4 zm. Next, the coated surface is dried and heated with an infrared heater and a hot-air heating furnace, and while maintaining the surface temperature of the steel sheet at 180 ° C, the reflective film is immediately coated and cooled using a roll laminator. Got. The obtained reflector was excellent in processability and had a high reflectance.
- the reflective films of the present invention in Examples 1 and 2 have a high light reflectivity with an average reflectance of 98% or higher and a film surface with a wavelength of 450 nm having a reflectance of 95% or higher. And has excellent reflectivity even after the UV irradiation test, resulting in a decrease in reflectivity.
- Example 1 using a modified carpositimide isocyanate, which is a terminal strength S isocyanate of a carpositimide compound as a hydrolysis inhibitor, was very excellent in hydrolysis resistance.
- the reflective films of Examples 1 and 2 were excellent in shape retention.
- the present invention has excellent light reflectivity, does not yellow over time due to use, does not deteriorate light reflectivity, and is excellent in heat resistance and hydrolysis resistance. Reflective film is obtained.
- the reflective film of the present invention uses an aliphatic polyester resin as a base resin, it has biodegradability.
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Abstract
Description
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US11/719,277 US20090082499A1 (en) | 2004-11-16 | 2005-11-10 | Aliphatic polyester-based resin reflective film and reflective plate |
EP05806004A EP1813969A1 (en) | 2004-11-16 | 2005-11-10 | Aliphatic polyester resin reflective film and reflector plate |
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JP2004331449A JP5054888B2 (ja) | 2004-11-16 | 2004-11-16 | 脂肪族ポリエステル系樹脂反射フィルム及び反射板 |
JP2004-331448 | 2004-11-16 | ||
JP2004-331449 | 2004-11-16 | ||
JP2004331448A JP4750405B2 (ja) | 2004-11-16 | 2004-11-16 | 脂肪族ポリエステル系樹脂反射フィルム及び反射板 |
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- 2005-11-10 WO PCT/JP2005/020590 patent/WO2006054475A1/ja active Application Filing
- 2005-11-10 US US11/719,277 patent/US20090082499A1/en not_active Abandoned
- 2005-11-10 EP EP05806004A patent/EP1813969A1/en not_active Withdrawn
- 2005-11-10 KR KR1020077011058A patent/KR100885389B1/ko not_active IP Right Cessation
- 2005-11-14 TW TW094139933A patent/TW200626642A/zh not_active IP Right Cessation
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JP2003004913A (ja) * | 2001-06-22 | 2003-01-08 | Toyobo Co Ltd | 光学用フィルム及び積層体 |
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CN101265335B (zh) * | 2007-03-14 | 2012-09-19 | 东丽株式会社 | 反射板用聚酯薄膜 |
TWI396902B (zh) * | 2007-03-14 | 2013-05-21 | Toray Industries | 反射板用聚酯薄膜 |
US20120132894A1 (en) * | 2009-03-27 | 2012-05-31 | Osram Opto Semiconductors Gmbh | Organic Optoelectronic Component and Method for Producing an Organic Optoelectronic Component |
US9466797B2 (en) * | 2009-03-30 | 2016-10-11 | Osram Oled Gmbh | Organic optoelectronic component and method for producing an organic optoelectronic component |
TWI570294B (zh) * | 2012-12-28 | 2017-02-11 | 歐米亞國際公司 | 用於不織布及纖維之聚酯中的碳酸鈣 |
US11208738B2 (en) | 2014-07-01 | 2021-12-28 | Omya International Ag | Multifilament polyester fibres |
JP2016208849A (ja) * | 2015-04-29 | 2016-12-15 | アキレス株式会社 | 生分解性フィルム |
Also Published As
Publication number | Publication date |
---|---|
EP1813969A1 (en) | 2007-08-01 |
US20090082499A1 (en) | 2009-03-26 |
TW200626642A (en) | 2006-08-01 |
TWI310775B (ja) | 2009-06-11 |
KR100885389B1 (ko) | 2009-02-24 |
KR20070067218A (ko) | 2007-06-27 |
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