WO2010074312A1 - Light diffusion plate - Google Patents
Light diffusion plate Download PDFInfo
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- WO2010074312A1 WO2010074312A1 PCT/JP2009/071850 JP2009071850W WO2010074312A1 WO 2010074312 A1 WO2010074312 A1 WO 2010074312A1 JP 2009071850 W JP2009071850 W JP 2009071850W WO 2010074312 A1 WO2010074312 A1 WO 2010074312A1
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- 0 CC(C1C2)C3CCCCC2(CCC2*C2)C1=C(C)C3 Chemical compound CC(C1C2)C3CCCCC2(CCC2*C2)C1=C(C)C3 0.000 description 6
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- 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
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
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- 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
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/005—Stabilisers against oxidation, heat, light, ozone
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- 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
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
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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
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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
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
Definitions
- the present invention relates to a light diffusing plate in which discoloration is prevented and bleed-out is suppressed, and a surface light source device and a liquid crystal display device having excellent durability that are configured using the light diffusing plate.
- a configuration in which a surface light source device is disposed as a backlight on the back side of a liquid crystal panel (image display unit) including a liquid crystal cell is known.
- a surface light source device for the backlight a surface light source device having a configuration in which a plurality of light sources are disposed in a lamp box (housing) and a light diffusion plate is disposed on the front side of these light sources is known.
- a lamp box housing
- a light diffusion plate is disposed on the front side of these light sources.
- the light diffusing plate used in the surface light source device as described above it is required to be lighter, hard to break, not to be deformed by heat from the light source, moisture, etc., acrylic resin or polycarbonate
- acrylic resin or polycarbonate The above-mentioned conventional light diffusing plate made of a resin cannot satisfy all of the required characteristics.
- the present applicant has found that if a propylene resin is used as a constituent resin, it is possible to provide a light diffusing plate that is lighter, has sufficient strength, and is not easily deformed by heat or moisture (Japanese Patent Laid-Open No. 2008-2008). -83660 (see Patent Document 2)).
- a benzotriazole-based ultraviolet absorber such as Adeka Stab LA-31 manufactured by ADEKA is included in a styrene resin-based light diffusion plate (Japanese Patent Application Laid-Open No. 2007-264598). (See Patent Document 3).
- the present invention has been made in view of such a technical background, and provides a light diffusing plate in which discoloration is prevented and bleeding out is suppressed under an environment such as light or heat from a light source and its use. For the purpose.
- the present invention provides the following means.
- a light diffusing plate comprising a resin composition containing 0.03 parts by mass to 10 parts by mass of one or more light stabilizers selected from the group consisting of third hindered amine light stabilizers.
- R 11 and R 12 each independently represents a hydrogen atom, a linear alkyl group having 1 to 24 carbon atoms or a branched alkyl group having 3 to 24 carbon atoms, and n represents 1 to It is an integer of 100.
- R 21 represents a substituent represented by the following formula (V).
- R 52 represents a butyl group
- R 53 represents a substituent represented by the following formula (VI).
- R 64 represents a hydrogen atom, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 3 to 12 carbon atoms, a linear alkoxyl group having 1 to 12 carbon atoms, or carbon.
- the resin composition further includes a first ultraviolet absorber represented by the following formula (III) and a second ultraviolet absorber represented by the following formula (IV) with respect to 100 parts by mass of the propylene resin.
- the light diffusing plate according to item 1 above containing 0.03 to 10 parts by mass of one or more ultraviolet absorbers selected from the group consisting of: (Wherein R 31 , R 32 and R 33 each independently represents a hydrogen atom, a methyl group, a tert-butyl group, a tert-octyl group, —O (CH 2 ) 7 CH 3 or the following formula (VII): And X represents a hydrogen atom or a chlorine atom.) (In the formula, R 41 , R 42 , R 43 and R 44 are each independently represented by a hydrogen atom, a cyano group, a phenyl group, —COOCH 3 , —COOC 2 H 5 , and the following formula (VIII): A substituent, a substituent represented by the following formula (IX) or a substituent represented by the following formula (X) is represented.) (Wherein R 105 and R 106 each represent —COOC 2 H 5 ) [3] The resin composition according
- R 31 , R 32 and R 33 each independently represents a hydrogen atom, a methyl group, a tert-butyl group, a tert-octyl group, —O (CH 2 ) 7 CH 3 or the following formula (VII): And X represents a hydrogen atom or a chlorine atom.
- a resin composition containing 0.03 to 10 parts by mass of one or more light stabilizers selected from the group consisting of third hindered amine light stabilizers.
- the resin composition absorbs ultraviolet rays.
- a light diffusing plate that does not contain an agent.
- R 11 and R 12 each independently represents a hydrogen atom, a linear alkyl group having 1 to 24 carbon atoms or a branched alkyl group having 3 to 24 carbon atoms, and n represents 1 to It is an integer of 100.
- R 21 represents a substituent represented by the following formula (V).
- R 52 represents a butyl group
- R 53 represents a substituent represented by the following formula (VI).
- R 64 represents a hydrogen atom, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 3 to 12 carbon atoms, a linear alkoxyl group having 1 to 12 carbon atoms, or carbon.
- a surface light source device comprising the light diffusing plate according to any one of items 1 to 4 and a plurality of light sources arranged on the back side of the light diffusing plate.
- the light diffusing plate according to any one of 1 to 4 above, a plurality of light sources arranged on the back side of the light diffusing plate, a liquid crystal panel arranged on the front side of the light diffusing plate, A liquid crystal display device comprising:
- propylene resin is used as the constituent resin, it is lightweight, excellent in mechanical strength and hardly broken, and excellent in heat resistance and moisture resistance, and is not easily deformed by heat or moisture.
- a resin containing 0.03 to 10 parts by mass of one or more light stabilizers selected from the group consisting of the first, second and third hindered amine light stabilizers with respect to 100 parts by mass of propylene resin Since it consists of a composition, discoloration is prevented in a certain environment, such as light from a light source and heat, and bleed-out is also suppressed.
- propylene resin since propylene resin is used as the constituent resin, it is lightweight, excellent in mechanical strength and hardly broken, and excellent in heat resistance and moisture resistance and hardly deformed by heat or moisture.
- 0.03 to 10 parts by mass of one or more light stabilizers selected from the group consisting of the first, second and third hindered amine light stabilizers are contained with respect to 100 parts by mass of the propylene resin. Therefore, discoloration is prevented in an environment with light from the light source, heat, and the like, and bleeding out is also suppressed. Furthermore, since it contains 0.03 to 10 parts by mass of one or more ultraviolet absorbers selected from the group consisting of the first and second ultraviolet absorbers with respect to 100 parts by mass of propylene resin, the effect of preventing discoloration is obtained. Furthermore, the bleed-out is also suppressed.
- propylene resin is used as the constituent resin, it is lightweight, excellent in mechanical strength and hardly broken, and excellent in heat resistance and moisture resistance and hardly deformed by heat or moisture. Further, 0.03 to 10 parts by mass of one or more light stabilizers selected from the group consisting of the first, second and third hindered amine light stabilizers are contained with respect to 100 parts by mass of the propylene resin. Therefore, discoloration is prevented in an environment with light from the light source, heat, and the like, and bleeding out is also suppressed. Further, since 0.03 to 10 parts by mass of the first ultraviolet absorber is contained with respect to 100 parts by mass of the propylene resin, the effect of preventing discoloration is further enhanced and bleeding out is also suppressed.
- propylene resin is used as the constituent resin, it is lightweight, excellent in mechanical strength and hardly broken, and excellent in heat resistance and moisture resistance, and is not easily deformed by heat or moisture. Further, containing 0.03 parts by mass to 10 parts by mass of one or more light stabilizers selected from the group consisting of the first, second and third hindered amine light stabilizers with respect to 100 parts by mass of the propylene resin, And since it does not contain an ultraviolet absorber, discoloration is prevented in an environment such as light or heat from the light source, and bleeding out is also suppressed.
- FIG. 1 is a schematic view showing an embodiment of a liquid crystal display device according to the present invention.
- FIG. 2 is a cross-sectional view showing an example of the concavo-convex shape formed on the surface of the light diffusion plate.
- FIG. 3 is a cross-sectional view showing another example of the uneven shape formed on the surface of the light diffusion plate.
- FIG. 4 is a perspective view showing another example of a substantially semicircular convex portion.
- FIG. 5 is a cross-sectional view showing still another example of the uneven shape formed on the surface of the light diffusion plate.
- FIG. 6 is a perspective view showing the substantially triangular convex portion of FIG.
- FIG. 7 is a perspective view showing another example of the substantially triangular convex portion.
- FIG. 1 An embodiment of a liquid crystal display device according to the present invention is shown in FIG.
- (30) is a liquid crystal display device
- (11) is a liquid crystal cell
- (12) and (13) are polarizing plates
- (1) is a surface light source device (backlight).
- Polarizing plates (12) and (13) are respectively arranged on the upper and lower sides of the liquid crystal cell (11), and a liquid crystal panel (20) as an image display unit is constituted by these constituent members (11), (12) and (13).
- the liquid crystal cell (11) those capable of displaying a color image are preferably used.
- the said surface light source device (1) is arrange
- this liquid crystal display device (30) is a direct liquid crystal display device.
- the surface light source device (1) is a thin box-shaped lamp box (5) having a rectangular shape in plan view and having an upper surface side (front surface side) opened, and the lamp box (5) spaced apart from each other.
- a light diffusion plate (3) disposed on the upper side (front side) of the plurality of light sources (2).
- the said light diffusing plate (3) is mounted and fixed with respect to the said lamp box (5) so that the open surface may be block
- a light reflecting layer (not shown) is provided on the inner surface of the lamp box (5).
- the light diffusion plate (3) includes 100 parts by mass of a propylene resin, a first hindered amine light stabilizer represented by the formula (I), a second hindered amine light stabilizer represented by the formula (II), and the It consists of a resin composition containing 0.03 to 10 parts by mass of one or more light stabilizers (HALS) selected from the group consisting of third hindered amine light stabilizers represented by the formula (XI).
- HALS light stabilizers
- the light stabilizer may be one selected from the group consisting of the first, second and third hindered amine light stabilizers, or two or more selected from the group. Since the light diffusion plate (3) according to the above configuration uses propylene resin as a constituent resin, it is lightweight, excellent in mechanical strength and hard to break, and excellent in heat resistance and moisture resistance due to heat and moisture. Difficult to deform. A resin containing 0.03 to 10 parts by mass of one or more light stabilizers selected from the group consisting of the first, second and third hindered amine light stabilizers with respect to 100 parts by mass of propylene resin Since it consists of a composition, discoloration is prevented in a certain environment, such as light from a light source and heat, and bleed-out is also suppressed.
- the surface light source device (1) has excellent durability and high quality.
- the content of the specific light stabilizer is preferably 0.05 to 5 parts by mass with respect to 100 parts by mass of the propylene resin, and further 0.10 parts by mass with respect to 100 parts by mass of the propylene resin. It is particularly preferably 2 to 2 parts by mass.
- the said light diffusing plate (3) is 0.03 mass part of 1 or more types of light stabilizers chosen from the group which consists of said 1st, 2nd and 3 with respect to 100 mass parts of propylene resin. It is preferably composed of a resin composition containing 0.03 parts by mass to 10 parts by mass of one or more kinds of ultraviolet absorbers selected from the group consisting of 10 parts by mass and the first and second ultraviolet absorbers.
- a specific ultraviolet absorber is contained in a specific amount, so that the effect of preventing discoloration can be further enhanced while suppressing bleed out.
- the content of the specific light stabilizer is preferably 0.05 to 5 parts by mass with respect to 100 parts by mass of the propylene resin, and further 0.10 parts by mass with respect to 100 parts by mass of the propylene resin. It is particularly preferably 2 to 2 parts by mass.
- the content of the specific ultraviolet absorber is preferably 0.05 parts by mass to 5 parts by mass with respect to 100 parts by mass of the propylene resin, and further 0.10 parts by mass with respect to 100 parts by mass of the propylene resin. It is particularly preferably 2 to 2 parts by mass.
- the specific ultraviolet absorber it is preferable to use a first ultraviolet absorber represented by the general formula (III) (one kind or two or more kinds) may be used.
- the light diffusing plate (3) contains 0.03 of one or more light stabilizers selected from the group consisting of the first, second, and third hindered amine light stabilizers with respect to 100 parts by mass of the propylene resin.
- the resin composition is preferably contained in an amount of 10 to 10 parts by mass, and the resin composition preferably contains no ultraviolet absorber (UVA). In this case, bleed out is further suppressed.
- UVA ultraviolet absorber
- a 1st hindered amine light stabilizer represented by the said general formula (I) For example, Tinuvin 622LD (made by Ciba Japan) etc. are mentioned. Tinuvin 622LD has the formula (I), wherein R 11 is a hydrogen atom and R 12 is a methyl group.
- the Kimasorb 119FL includes 90% by mass of a second hindered amine light stabilizer represented by the formula (II), and a first hindered amine light in which R 11 is a hydrogen atom and R 12 is a methyl group in the formula (I). It is a mixture with 10% by weight of stabilizer.
- Tinuvin XT850FF manufactured by Ciba Japan
- Tinuvin XT855FF manufactured by Ciba Japan
- It is at least one light stabilizer selected from the group consisting of the third hindered amine light stabilizers represented.
- Tinuvin 234 made by Ciba Japan
- Tinuvin 328 made by Ciba Japan
- SEESORB703 Manufactured by Sipro Kasei Co., Ltd.
- SEESORB 707 manufactured by Sipro Kasei Co., Ltd.
- the tinuvin 234 is a substituent in which R 31 is represented by the formula (VII), R 32 is a hydrogen atom, R 33 is a substituent represented by the formula (VII), and X is a hydrogen atom. is there.
- R 31 is a tert-octyl group
- R 32 is a hydrogen atom
- R 33 is a tert-octyl group
- X is a hydrogen atom
- R 31 is a tert-butyl group
- R 32 is a hydrogen atom
- R 33 is a methyl group
- X is a chlorine atom.
- R 31 is a hydrogen atom
- R 32 is -O (CH 2) 7 CH 3 group
- R 33 is a hydrogen atom
- X is a hydrogen atom.
- SEESORB501 made by Sipro Kasei
- SEESORB502 made by Sipro Kasei
- PR25 made by Clariant
- B-CAP manufactured by Clariant
- R 41 is a phenyl group
- R 42 is a phenyl group
- R 43 is a cyano group
- R 44 is -COOC 2 H 5 group.
- the SEESORB 502 is a substituent represented by the formula (IV), wherein R 41 is a phenyl group, R 42 is a phenyl group, R 43 is a cyano group, and R 44 is a formula (IX).
- R 41 is a phenyl group
- R 42 is a phenyl group
- R 43 is a cyano group
- R 44 is a formula (IX).
- the substituents R 43 is represented by formula (VIII)
- R 44 is hydrogen atom.
- R 41 is a substituent represented by the formula (X)
- R 42 is a hydrogen atom
- R 43 , R 44 , R 105 , and R 106 are all —COOC 2 H in the formula (IV). Five groups.
- the propylene resin may be a homopolypropylene obtained by polymerizing propylene alone, or may be a copolymer of propylene and a copolymerizable component that can be copolymerized therewith.
- the content of propylene units in the propylene resin is preferably 75% by mass or more in that sufficient rigidity is obtained.
- the copolymer component is not particularly limited, and examples thereof include ⁇ -olefins such as ethylene and 1-butene.
- the propylene resin preferably has a propylene unit content of 75 to 100% by mass, an ethylene unit content of 0 to 15% by mass, and a 1-butene unit content of 0 to 25% by mass.
- the propylene resin is more preferably composed of a propylene unit content of 95 to 100% by mass, an ethylene unit content of 0 to 5% by mass, and a 1-butene unit content of 0 to 5% by mass. Further, the propylene resin includes a propylene unit content of 99 to 100% by mass, an ethylene unit content of 0 to 1% by mass, and a 1-butene unit content of 0 to 1% by mass (including homopolypropylene). Is most preferred. It is preferable that light diffusing particles and / or nucleating agents are further blended with the propylene resin constituting the light diffusing plate (3).
- the light diffusing particle is not particularly limited as long as it is a particle having a refractive index different from that of the propylene resin and can diffuse light transmitted through a light diffusing plate containing the particle.
- it may be inorganic particles such as glass particles, glass fibers, silica particles, aluminum hydroxide particles, calcium carbonate particles, barium sulfate particles, titanium oxide particles, talc, styrene polymer particles, acrylic polymers.
- Organic particles such as particles and siloxane polymer particles may be used.
- the light diffusing particles those having a volume average particle diameter in the range of 0.5 ⁇ m to 25 ⁇ m are usually used.
- a preferable lower limit value of the volume average particle diameter is 0.7 ⁇ m
- a preferable upper limit value of the volume average particle diameter is 20 ⁇ m
- a particularly preferable upper limit value is 10 ⁇ m.
- the volume average particle diameter (D 50 ) is determined by measuring the particle diameter and volume of all the particles, and sequentially integrating the volumes from the smallest particle diameter, and the integrated volume is 50% with respect to the total volume of all the particles.
- the content of the light diffusing particles in the light diffusing plate (3) is preferably set in the range of 0.01 to 20 parts by mass with respect to 100 parts by mass of the propylene resin.
- the nucleating agent is not particularly limited.
- sorbitol nucleating agent, organophosphate nucleating agent, metal salt nucleating agent of carboxylic acid, rosin nucleating agent, etc. Can be used.
- the content of the nucleating agent in the light diffusing plate (3) is preferably in the range of 0.01 to 1.0 part by mass with respect to 100 parts by mass of the propylene resin.
- the resin composition which comprises the said light diffusing plate (3) may contain additives, such as a heat stabilizer, antioxidant, a weathering agent, a fluorescent whitening agent, and a processing stabilizer, as needed.
- the size of the light diffusing plate (3) is not particularly limited, and is appropriately set according to the size of the target surface light source device (1) or liquid crystal display device (30), for example.
- the light diffusing plate (3) of this invention can be manufactured as follows, for example.
- the resin composition having the above composition can be produced by a known molding method such as an extrusion molding method for extrusion molding, an injection molding method for injection molding, or a hot pressing method for hot pressing.
- the said manufacturing method is only what showed the example, and the light diffusing plate (3) of this invention is not limited to what was manufactured with such a manufacturing method.
- the light diffusing plate (3) may be flat on both sides as shown in FIG.
- At least one side may be a surface on which irregularities such as a lenticular lens, a Fresnel lens, and a prism lens are formed.
- at least one surface may be a matte surface.
- the ten-point average roughness (Rz) of the surface is preferably set to 1 ⁇ m to 100 ⁇ m, and thereby the surface (matte surface) of the light diffusion plate (3) is set. The occurrence of scratches can be sufficiently suppressed.
- FIG. 2 an example of the uneven
- FIG. 2 an example of the uneven
- FIG. 1 an example of the uneven
- a concavo-convex shape in which the cross-sectional shape is a triangular convex portion (V-shaped groove) is adopted.
- adjacent triangular convex portions (71) are formed in a continuous manner without any interval (in other words, adjacent V-shaped grooves (72) are formed in a continuous shape).
- the configuration is not particularly limited to such a configuration, and adjacent triangular convex portions may be configured to be discontinuous with an interval (d 1 ).
- the pitch interval (P 1 ) of the triangular protrusions (71) is preferably in the range of 30 ⁇ m to 500 ⁇ m.
- the height (H 1 ) of the triangular convex portion (71) is preferably in the range of 30 ⁇ m to 500 ⁇ m.
- the spacing distance (d 1 : not shown) between the adjacent triangular protrusions (71) is preferably in the range of 1 ⁇ m to 10 ⁇ m.
- the apex angle ( ⁇ ) of the apex of the triangular convex portion (71) is preferably 10 to 100 °, and more preferably 10 to 90 °.
- FIG. 3 shows another example of the uneven shape formed on the surface (one side or both sides) (6b) of the light diffusion plate (3). In FIG. 3, an uneven shape including a substantially semicircular convex portion (81) having a substantially semicircular cross-sectional shape is employed.
- adjacent semi-circular protrusions (81) are formed in a discontinuous manner with an interval (d 2 ), but are not particularly limited to such a configuration.
- the pitch interval (P 2 ) of the substantially semicircular protrusions (81) is preferably in the range of 30 ⁇ m to 500 ⁇ m.
- the height (H 2 ) of the substantially semicircular protrusion (81) is preferably in the range of 30 ⁇ m to 500 ⁇ m.
- the spacing (d 2 ) between the adjacent substantially semicircular convex portions (81) is preferably in the range of 1 ⁇ m to 10 ⁇ m.
- the substantially semicircular convex portion (81) includes not only those having a semicircular cross-sectional shape as shown in FIG. 3, but also a cylindrical body such as a cylindrical lens (82) shown in FIG. It may be in the shape of any arc of the cross section when cut by a plane that is parallel to the central axis and does not include the central axis.
- the cross section may be a semi-elliptical arc or a semi-elliptical arc. It may be a part of a flat curved shape or the like.
- the uneven shape formed on the surface (one side or both sides) (6b) of the light diffusing plate (3) may be a shape provided with a substantially semicircular concave groove in which the substantially semicircular convex portion is inverted.
- the substantially semi-circular groove includes those having a semicircular cross-sectional shape, and also, for example, a cylindrical body, such as a cylindrical lens, cut along a plane that is parallel to the central axis and does not include the central axis.
- the cross section may have any arc shape, or the cross section may have a semi-elliptical arc shape, a flat curved shape that is a part of the semi-elliptical arc shape, or the like.
- corrugated shape formed in the surface (one side or both sides) (6b) of a light diffusing plate (3) is shown.
- the left and right hypotenuses in the cross-sectional shape of the substantially triangular convex portion (91) are both straight at the tip side and curved at the base end side (bottom side) (curved bulging sideways at the center). That is, the left and right slopes of the substantially triangular convex portion (91) are composed of a straight portion (92) on the distal end side and a curved portion (93) on the proximal end side.
- the adjacent substantially triangular protrusions (91) are formed in a discontinuous manner with an interval (d 3 ), but are not particularly limited to such a configuration and are adjacent to each other.
- the pitch interval (P 3 ) of the substantially triangular convex portions (91) is preferably in the range of 30 ⁇ m to 500 ⁇ m.
- the height (H 3 ) of the substantially triangular convex portion (91) is preferably in the range of 30 ⁇ m to 500 ⁇ m.
- the spacing (d 3 ) between the adjacent substantially triangular convex portions (91) is in the range of 1 ⁇ m to 10 ⁇ m.
- the apex angle ( ⁇ ) of the substantially triangular convex portion (91) is preferably 10 ° to 100 °, and more preferably 10 ° to 90 °.
- the curve of the curved portion (93) may be, for example, an arc-shaped part or an elliptical arc-shaped part.
- the arc-shaped part for example, a cylindrical lens having a circular arc shape in a cross section when the cylindrical body is cut by a plane that is parallel to the central axis and does not include the central axis, etc. Is mentioned.
- the substantially triangular convex portion (91) is a slope formed by connecting the proximal-side curved portion (93) to the distal-side straight portion (92).
- the present invention is not particularly limited to such a configuration.
- a slope having only a curved portion (93) without a straight portion is provided.
- a configuration may be adopted.
- the pitch interval (P 1 ) (P 2 ) (P 3 ) of the concavo-convex convex portions does not necessarily have to be constant over the entire light diffusing plate (3), and the convex portions adjacent to each other partially or entirely.
- (71) (81) (91) may be different.
- the height (H 1 ) (H 2 ) (H 3 ) of the concavo-convex convex portions does not necessarily have to be constant over the entire light diffusion plate (3), and is partially or entirely adjacent. You may differ between convex parts (71) (81) (91). Similarly, the apex angle ( ⁇ ) ( ⁇ ) and the interval (d 1 ) (d 2 ) (d 3 ) of the concavo-convex shape do not necessarily have to be constant throughout the light diffusion plate (3). Alternatively, the protrusions (71) (81) (91) which are adjacent to each other may be different.
- the light diffusing plate (3) for example, if the light diffusing plate is produced by extrusion molding, resin particles insoluble in the resin constituting the surface side layer are used. Examples thereof include a method of containing and extrusion molding, a method of transferring a concavo-convex to the surface of an extruded plate (light diffusion plate) by bringing a transfer roll having a concavo-convex shape on the surface thereof into contact immediately after extrusion. Moreover, when manufacturing a light-diffusion board by injection molding or a hot press, the method etc. which transfer an unevenness
- the light diffusing plate (3), the surface light source device (1) and the liquid crystal display device (30) according to the present invention are not particularly limited to those of the above-described embodiment, and the spirit thereof is within the scope of the claims. Any design changes are allowed as long as they do not deviate from.
- Example 1 99.1 parts by mass of propylene resin ("FSX20L8" manufactured by Sumitomo Chemical Co., Ltd.), 0.5 parts by mass of Tinuvin XT850FF (Ciba Japan Co., Ltd.), 0.2 parts by mass of Sumizer GP (manufactured by Sumitomo Chemical Co., Ltd., thermal stabilizer), After dry blending 0.2 part by weight of ADK STAB NA11 (manufactured by ADEKA, phosphate ester nucleating agent), it is supplied to an extruder with a screw diameter of 40 mm and melt-kneaded at 210-250 ° C., via a multi-manifold die Then, a light diffusion plate (thickness 1.5 mm, width 250 mm) was obtained by extrusion at a die temperature of 250 to 260 ° C.
- FSX20L8 propylene resin
- Tinuvin XT850FF Ciba Japan Co., Ltd.
- Sumizer GP manufactured by Sum
- Examples 2 to 9 Comparative Examples 1 to 5> A light diffusing plate was obtained in the same manner as in Example 1 except that the materials shown in Tables 1 to 3 were used in the ratios shown in Tables 1 to 3, respectively.
- “LA31” is an ultraviolet absorber made by ADEKA
- “Irgaphos 168” is a heat stabilizer made by Ciba Japan.
- Each light diffusion plate obtained as described above was evaluated according to the following evaluation method. The evaluation results are shown in Tables 1 to 3.
- ⁇ Durability evaluation method> Each light diffusion plate is subjected to the following mercury lamp irradiation test, high-temperature and high-humidity test, high-temperature test, and low-temperature test, the surface state of the light diffusion plate after the test is visually observed, and powder is adhered to the surface (that is, bleeding) "No"), and "Good” indicates that the surface condition was good and similar to the initial state before the test (ie, no bleed out). Further, the yellowness YI of the light diffusing plate before the above test was measured by the following YI measurement method, which was designated as “initial YI”, and the yellowness YI of the light diffusing plate after the above test was measured.
- ⁇ YI (YI after test) ⁇ (initial YI) (250 hours mercury lamp irradiation test)
- the light diffusion plate was irradiated with a mercury lamp for 250 hours under the condition of 75 ° C. (250 hours high temperature and high humidity test)
- the light diffusion plate was placed for 250 hours under high temperature and high humidity conditions of 60 ° C. and 90% RH.
- the light diffusing plate was placed under a high temperature condition of 80 ° C. for 250 hours.
- 250 hour low temperature test The light diffusing plate was placed for 250 hours under a low temperature condition of ⁇ 40 ° C.
- the light diffusion plate was irradiated with a mercury lamp for 500 hours under the condition of 75 ° C. (500 hours high temperature and high humidity test) The light diffusion plate was placed for 500 hours under high temperature and high humidity conditions of 60 ° C. and 90% RH. (500 hours high temperature test) The light diffusing plate was placed under high temperature conditions of 80 ° C. for 500 hours. (500 hours low temperature test) The light diffusing plate was placed for 500 hours under a low temperature condition of ⁇ 40 ° C.
- the addition amount of the hindered amine light stabilizer with respect to 100 parts by mass of the propylene resin is a small addition amount in the range of 0.1 parts by mass to 2.0 parts by mass.
- the addition amount of the hindered amine light stabilizer and the ultraviolet absorber with respect to 100 parts by mass of the propylene resin is a small addition amount ranging from 0.1 parts by mass to 2.0 parts by mass.
- the light diffusing plates of Examples 1 to 5 have such a small addition amount (low cost), ⁇ YI is smaller than 5 and the discoloration is sufficiently suppressed, mercury lamp irradiation test, high temperature and high humidity Even if a test, a high temperature test, and a low temperature test are performed for 500 hours, bleed-out does not occur, which is particularly preferable. In contrast, in Comparative Examples 1 to 5 that deviated from the specified range of the present invention, bleeding out occurred in 250 hours when the mercury lamp irradiation test, the high temperature and high humidity test, the high temperature test, and the low temperature test were performed.
- the light diffusing plate of the present invention is suitably used as a light diffusing plate for a surface light source device, but is not particularly limited to such applications.
- the surface light source device of the present invention is preferably used as a backlight for a liquid crystal display device, but is not particularly limited to such applications.
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Abstract
Disclosed is a light diffusion plate (3) which is formed from a resin composition containing 100 parts by mass of a propylene resin and 0.03-10 parts by mass of a hindered amine light stabilizer having a specific chemical structure. The light diffusion plate (3)is used in a surface light source device (1) which comprises a light source (2) that is arranged on the back side of the light diffusion plate (3).
Description
本発明は、変色が防止され、ブリードアウトが抑制された光拡散板および該光拡散板を用いて構成された耐久性に優れた面光源装置と液晶表示装置に関する。
The present invention relates to a light diffusing plate in which discoloration is prevented and bleed-out is suppressed, and a surface light source device and a liquid crystal display device having excellent durability that are configured using the light diffusing plate.
液晶表示装置としては、例えば液晶セルを備えた液晶パネル(画像表示部)の背面側に、面光源装置がバックライトとして配置された構成のものが公知である。前記バックライト用の面光源装置としては、ランプボックス(筐体)内に複数の光源が配置されると共にこれら光源の前面側に光拡散板が配置された構成の面光源装置が知られている(特開2004−170937号公報(特許文献1)参照)。
上記光拡散板としては、アクリル樹脂、ポリカーボネート樹脂で構成されたものが用いられることが多かった。
上記のような面光源装置に用いられる光拡散板としては、より軽量であること、壊れ難いこと、光源等からの熱や、湿気等により変形しないことが求められているところ、アクリル樹脂やポリカーボネート樹脂からなる上記従来の光拡散板では、これら要求された特性の全てを満たすことはできなかった。
本出願人は、鋭意研究した結果、構成樹脂としてプロピレン樹脂を用いれば、より軽量で、十分な強度を有し、熱や湿気により変形しにくい光拡散板を提供できることを見出した(特開2008−83660号公報(特許文献2)参照)。
バックライトに用いられる光拡散板としては、光源等からの光や熱、その他の種々の環境下において、変色が少ないことが望まれている。
このような変色を抑制するために、例えばADEKA社製アデカスタブLA−31等のベンゾトリアゾール系紫外線吸収剤をスチレン樹脂系光拡散板に含有せしめることが行われている(特開2007−264598号公報(特許文献3)参照)。 As a liquid crystal display device, for example, a configuration in which a surface light source device is disposed as a backlight on the back side of a liquid crystal panel (image display unit) including a liquid crystal cell is known. As the surface light source device for the backlight, a surface light source device having a configuration in which a plurality of light sources are disposed in a lamp box (housing) and a light diffusion plate is disposed on the front side of these light sources is known. (Refer to Unexamined-Japanese-Patent No. 2004-170937 (patent document 1)).
As the light diffusing plate, those made of acrylic resin or polycarbonate resin are often used.
As the light diffusing plate used in the surface light source device as described above, it is required to be lighter, hard to break, not to be deformed by heat from the light source, moisture, etc., acrylic resin or polycarbonate The above-mentioned conventional light diffusing plate made of a resin cannot satisfy all of the required characteristics.
As a result of diligent research, the present applicant has found that if a propylene resin is used as a constituent resin, it is possible to provide a light diffusing plate that is lighter, has sufficient strength, and is not easily deformed by heat or moisture (Japanese Patent Laid-Open No. 2008-2008). -83660 (see Patent Document 2)).
As a light diffusing plate used in a backlight, it is desired that the color of the light diffusing plate is less discolored under light and heat from a light source or the like and in various other environments.
In order to suppress such discoloration, for example, a benzotriazole-based ultraviolet absorber such as Adeka Stab LA-31 manufactured by ADEKA is included in a styrene resin-based light diffusion plate (Japanese Patent Application Laid-Open No. 2007-264598). (See Patent Document 3).
上記光拡散板としては、アクリル樹脂、ポリカーボネート樹脂で構成されたものが用いられることが多かった。
上記のような面光源装置に用いられる光拡散板としては、より軽量であること、壊れ難いこと、光源等からの熱や、湿気等により変形しないことが求められているところ、アクリル樹脂やポリカーボネート樹脂からなる上記従来の光拡散板では、これら要求された特性の全てを満たすことはできなかった。
本出願人は、鋭意研究した結果、構成樹脂としてプロピレン樹脂を用いれば、より軽量で、十分な強度を有し、熱や湿気により変形しにくい光拡散板を提供できることを見出した(特開2008−83660号公報(特許文献2)参照)。
バックライトに用いられる光拡散板としては、光源等からの光や熱、その他の種々の環境下において、変色が少ないことが望まれている。
このような変色を抑制するために、例えばADEKA社製アデカスタブLA−31等のベンゾトリアゾール系紫外線吸収剤をスチレン樹脂系光拡散板に含有せしめることが行われている(特開2007−264598号公報(特許文献3)参照)。 As a liquid crystal display device, for example, a configuration in which a surface light source device is disposed as a backlight on the back side of a liquid crystal panel (image display unit) including a liquid crystal cell is known. As the surface light source device for the backlight, a surface light source device having a configuration in which a plurality of light sources are disposed in a lamp box (housing) and a light diffusion plate is disposed on the front side of these light sources is known. (Refer to Unexamined-Japanese-Patent No. 2004-170937 (patent document 1)).
As the light diffusing plate, those made of acrylic resin or polycarbonate resin are often used.
As the light diffusing plate used in the surface light source device as described above, it is required to be lighter, hard to break, not to be deformed by heat from the light source, moisture, etc., acrylic resin or polycarbonate The above-mentioned conventional light diffusing plate made of a resin cannot satisfy all of the required characteristics.
As a result of diligent research, the present applicant has found that if a propylene resin is used as a constituent resin, it is possible to provide a light diffusing plate that is lighter, has sufficient strength, and is not easily deformed by heat or moisture (Japanese Patent Laid-Open No. 2008-2008). -83660 (see Patent Document 2)).
As a light diffusing plate used in a backlight, it is desired that the color of the light diffusing plate is less discolored under light and heat from a light source or the like and in various other environments.
In order to suppress such discoloration, for example, a benzotriazole-based ultraviolet absorber such as Adeka Stab LA-31 manufactured by ADEKA is included in a styrene resin-based light diffusion plate (Japanese Patent Application Laid-Open No. 2007-264598). (See Patent Document 3).
しかしながら、本発明者らの検討によれば、例えば、ADEKA社製アデカスタブLA−31等のベンゾトリアゾール系紫外線吸収剤をプロピレン樹脂製光拡散板に含有せしめた場合には、該紫外線吸収剤がすぐにブリードアウトしてしまうことが判明した。紫外線吸収剤がブリードアウトすると光拡散板の透明性が低下するし、良好な画像も得られない。
また、ADEKA社製アデカスタブLA−31等のベンゾトリアゾール系紫外線吸収剤をプロピレン樹脂製光拡散板に含有せしめた場合には、十分な変色防止効果が得られないことも判明した。
そこで、十分な変色防止効果が得られると共にブリードアウトを抑制できるプロピレン樹脂製光拡散板の開発が望まれる。
本発明は、かかる技術的背景に鑑みてなされたものであって、光源からの光や熱等のある環境下において変色が防止され、ブリードアウトが抑制された光拡散板およびその用途を提供することを目的とする。
前記目的を達成するために、本発明は以下の手段を提供する。
[1]プロピレン樹脂100質量部ならびに以下の式(I)で表される第1ヒンダードアミン系光安定剤、以下の式(II)で表される第2ヒンダードアミン系光安定剤および以下の式(XI)で表される第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤0.03質量部~10質量部を含有する樹脂組成物からなる光拡散板。
(式中、R11およびR12は、それぞれ独立に、水素原子、炭素原子数が1~24の直鎖アルキル基または炭素原子数が3~24の分岐アルキル基を表し、nは、1~100の整数である。)
(式中、R21は以下の式(V)で表される置換基を表す。)
(式中、R52はブチル基を表し、R53は以下の式(VI)で表される置換基を表す。)
(式中、R64は、水素原子、炭素原子数が1~12の直鎖アルキル基、炭素原子数が3~12の分岐アルキル基、炭素原子数が1~12の直鎖アルコキシル基または炭素原子数が3~12の分岐アルコキシル基を表す。)
(式中、R101およびR102は、それぞれ独立に、水素原子、炭素原子数が1~24の直鎖アルキル基または炭素原子数が3~24の分岐アルキル基を表す。)
[2]前記樹脂組成物は、前記プロピレン樹脂100質量部に対して更に以下の式(III)で表される第1紫外線吸収剤および以下の式(IV)で表される第2紫外線吸収剤からなる群より選ばれる1種以上の紫外線吸収剤を0.03質量部~10質量部含有する前項1に記載の光拡散板。
(式中、R31、R32およびR33は、それぞれ独立に、水素原子、メチル基、tert−ブチル基、tert−オクチル基、−O(CH2)7CH3または以下の式(VII)で表される置換基を表し、Xは水素原子または塩素原子を表す。)
(式中、R41、R42、R43およびR44は、それぞれ独立に、水素原子、シアノ基、フェニル基、−COOCH3、−COOC2H5、以下の式(VIII)で表される置換基、以下の式(IX)で表される置換基または以下の式(X)で表される置換基を表す。)
(式中、R105およびR106はそれぞれ、−COOC2H5を表す。)
[3]前記樹脂組成物は、前記プロピレン樹脂100質量部に対して更に以下の式(III)で表される第1紫外線吸収剤を0.03質量部~10質量部含有する前項1に記載の光拡散板。
(式中、R31、R32およびR33は、それぞれ独立に、水素原子、メチル基、tert−ブチル基、tert−オクチル基、−O(CH2)7CH3または以下の式(VII)で表される置換基を表し、Xは水素原子または塩素原子を表す。)
[4]プロピレン樹脂100質量部ならびに以下の式(I)で表される第1ヒンダードアミン系光安定剤、以下の式(II)で表される第2ヒンダードアミン系光安定剤および以下の式(XI)で表される第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤0.03質量部~10質量部を含有する樹脂組成物からなり、該樹脂組成物は紫外線吸収剤を含有しないものである光拡散板。
(式中、R11およびR12は、それぞれ独立に、水素原子、炭素原子数が1~24の直鎖アルキル基または炭素原子数が3~24の分岐アルキル基を表し、nは、1~100の整数である。)
(式中、R21は以下の式(V)で表される置換基を表す。)
(式中、R52はブチル基を表し、R53は以下の式(VI)で表される置換基を表す。)
(式中、R64は、水素原子、炭素原子数が1~12の直鎖アルキル基、炭素原子数が3~12の分岐アルキル基、炭素原子数が1~12の直鎖アルコキシル基または炭素原子数が3~12の分岐アルコキシル基を表す。)
(式中、R101およびR102は、それぞれ独立に、水素原子、炭素原子数が1~24の直鎖アルキル基または炭素原子数が3~24の分岐アルキル基を表す。)
[5]前項1~4のいずれか1項に記載の光拡散板と、該光拡散板の背面側に配置された複数の光源とを備える面光源装置。
[6]前項1~4のいずれか1項に記載の光拡散板と、該光拡散板の背面側に配置された複数の光源と、前記光拡散板の前面側に配置された液晶パネルとを備える液晶表示装置。
[1]の発明では、構成樹脂としてプロピレン樹脂を用いているから、軽量で、機械的強度に優れていて壊れ難く、また耐熱性および耐湿性に優れていて熱や湿気により変形しにくい。また、プロピレン樹脂100質量部に対して前記第1、第2および第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤を0.03質量部~10質量部含有する樹脂組成物からなるから、光源からの光や熱等のある環境下において変色が防止され、ブリードアウトも抑制されている。
[2]の発明では、構成樹脂としてプロピレン樹脂を用いているから、軽量で、機械的強度に優れていて壊れ難く、また耐熱性および耐湿性に優れていて熱や湿気により変形しにくい。また、プロピレン樹脂100質量部に対して前記第1、第2および第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤を0.03質量部~10質量部含有しているから、光源からの光や熱等のある環境下において変色が防止され、ブリードアウトも抑制されている。更に、プロピレン樹脂100質量部に対して前記第1および第2紫外線吸収剤からなる群より選ばれる1種以上の紫外線吸収剤を0.03質量部~10質量部含有するから、変色防止効果がさらに高められ、ブリードアウトも抑制されている。
[3]の発明では、構成樹脂としてプロピレン樹脂を用いているから、軽量で、機械的強度に優れていて壊れ難く、また耐熱性および耐湿性に優れていて熱や湿気により変形しにくい。また、プロピレン樹脂100質量部に対して前記第1、第2および第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤を0.03質量部~10質量部含有しているから、光源からの光や熱等のある環境下において変色が防止され、ブリードアウトも抑制されている。更に、プロピレン樹脂100質量部に対して前記第1紫外線吸収剤を0.03質量部~10質量部含有するから、変色防止効果がより高められ、ブリードアウトも抑制されている。
[4]の発明では、構成樹脂としてプロピレン樹脂を用いているから、軽量で、機械的強度に優れていて壊れ難く、また耐熱性および耐湿性に優れていて熱や湿気により変形しにくい。また、プロピレン樹脂100質量部に対して前記第1、第2および第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤を0.03質量部~10質量部含有し、且つ紫外線吸収剤を含有しないから、光源からの光や熱等のある環境下において変色が防止され、ブリードアウトも抑制されている。
[5]の発明では、光拡散板として変色が防止され、ブリードアウトが抑制されているものが用いられているから、耐久性に優れた高品質の面光源装置が提供される。
[6]の発明では、光拡散板として変色が防止され、ブリードアウトが抑制されているものが用いられているから、耐久性に優れた高品質の液晶表示装置が提供される。 However, according to the study by the present inventors, for example, when a benzotriazole ultraviolet absorber such as ADEKA STAB LA-31 manufactured by ADEKA is included in a light diffusion plate made of propylene resin, the ultraviolet absorber is immediately Turned out to bleed out. When the ultraviolet absorber bleeds out, the transparency of the light diffusing plate is lowered and a good image cannot be obtained.
It has also been found that when a benzotriazole ultraviolet absorber such as Adeka Stab LA-31 manufactured by ADEKA is included in a light diffusion plate made of propylene resin, a sufficient discoloration preventing effect cannot be obtained.
Therefore, it is desired to develop a light diffusion plate made of propylene resin that can obtain a sufficient discoloration preventing effect and can suppress bleed out.
The present invention has been made in view of such a technical background, and provides a light diffusing plate in which discoloration is prevented and bleeding out is suppressed under an environment such as light or heat from a light source and its use. For the purpose.
In order to achieve the above object, the present invention provides the following means.
[1] 100 parts by mass of propylene resin, a first hindered amine light stabilizer represented by the following formula (I), a second hindered amine light stabilizer represented by the following formula (II), and the following formula (XI) A light diffusing plate comprising a resin composition containing 0.03 parts by mass to 10 parts by mass of one or more light stabilizers selected from the group consisting of third hindered amine light stabilizers.
(Wherein R 11 and R 12 each independently represents a hydrogen atom, a linear alkyl group having 1 to 24 carbon atoms or a branched alkyl group having 3 to 24 carbon atoms, and n represents 1 to It is an integer of 100.)
(In the formula, R 21 represents a substituent represented by the following formula (V).)
(In the formula, R 52 represents a butyl group, and R 53 represents a substituent represented by the following formula (VI).)
(In the formula, R 64 represents a hydrogen atom, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 3 to 12 carbon atoms, a linear alkoxyl group having 1 to 12 carbon atoms, or carbon. Represents a branched alkoxyl group having 3 to 12 atoms.)
(In the formula, R 101 and R 102 each independently represent a hydrogen atom, a linear alkyl group having 1 to 24 carbon atoms, or a branched alkyl group having 3 to 24 carbon atoms.)
[2] The resin composition further includes a first ultraviolet absorber represented by the following formula (III) and a second ultraviolet absorber represented by the following formula (IV) with respect to 100 parts by mass of the propylene resin. 2. The light diffusing plate according to item 1 above, containing 0.03 to 10 parts by mass of one or more ultraviolet absorbers selected from the group consisting of:
(Wherein R 31 , R 32 and R 33 each independently represents a hydrogen atom, a methyl group, a tert-butyl group, a tert-octyl group, —O (CH 2 ) 7 CH 3 or the following formula (VII): And X represents a hydrogen atom or a chlorine atom.)
(In the formula, R 41 , R 42 , R 43 and R 44 are each independently represented by a hydrogen atom, a cyano group, a phenyl group, —COOCH 3 , —COOC 2 H 5 , and the following formula (VIII): A substituent, a substituent represented by the following formula (IX) or a substituent represented by the following formula (X) is represented.)
(Wherein R 105 and R 106 each represent —COOC 2 H 5 )
[3] The resin composition according to item 1 above, further comprising 0.03 to 10 parts by mass of a first ultraviolet absorber represented by the following formula (III) with respect to 100 parts by mass of the propylene resin. Light diffusing plate.
(Wherein R 31 , R 32 and R 33 each independently represents a hydrogen atom, a methyl group, a tert-butyl group, a tert-octyl group, —O (CH 2 ) 7 CH 3 or the following formula (VII): And X represents a hydrogen atom or a chlorine atom.)
[4] 100 parts by mass of propylene resin, a first hindered amine light stabilizer represented by the following formula (I), a second hindered amine light stabilizer represented by the following formula (II), and the following formula (XI) ) And a resin composition containing 0.03 to 10 parts by mass of one or more light stabilizers selected from the group consisting of third hindered amine light stabilizers. The resin composition absorbs ultraviolet rays. A light diffusing plate that does not contain an agent.
(Wherein R 11 and R 12 each independently represents a hydrogen atom, a linear alkyl group having 1 to 24 carbon atoms or a branched alkyl group having 3 to 24 carbon atoms, and n represents 1 to It is an integer of 100.)
(In the formula, R 21 represents a substituent represented by the following formula (V).)
(In the formula, R 52 represents a butyl group, and R 53 represents a substituent represented by the following formula (VI).)
(In the formula, R 64 represents a hydrogen atom, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 3 to 12 carbon atoms, a linear alkoxyl group having 1 to 12 carbon atoms, or carbon. Represents a branched alkoxyl group having 3 to 12 atoms.)
(In the formula, R 101 and R 102 each independently represent a hydrogen atom, a linear alkyl group having 1 to 24 carbon atoms, or a branched alkyl group having 3 to 24 carbon atoms.)
[5] A surface light source device comprising the light diffusing plate according to any one of items 1 to 4 and a plurality of light sources arranged on the back side of the light diffusing plate.
[6] The light diffusing plate according to any one of 1 to 4 above, a plurality of light sources arranged on the back side of the light diffusing plate, a liquid crystal panel arranged on the front side of the light diffusing plate, A liquid crystal display device comprising:
In the invention of [1], since propylene resin is used as the constituent resin, it is lightweight, excellent in mechanical strength and hardly broken, and excellent in heat resistance and moisture resistance, and is not easily deformed by heat or moisture. A resin containing 0.03 to 10 parts by mass of one or more light stabilizers selected from the group consisting of the first, second and third hindered amine light stabilizers with respect to 100 parts by mass of propylene resin Since it consists of a composition, discoloration is prevented in a certain environment, such as light from a light source and heat, and bleed-out is also suppressed.
In the invention of [2], since propylene resin is used as the constituent resin, it is lightweight, excellent in mechanical strength and hardly broken, and excellent in heat resistance and moisture resistance and hardly deformed by heat or moisture. Further, 0.03 to 10 parts by mass of one or more light stabilizers selected from the group consisting of the first, second and third hindered amine light stabilizers are contained with respect to 100 parts by mass of the propylene resin. Therefore, discoloration is prevented in an environment with light from the light source, heat, and the like, and bleeding out is also suppressed. Furthermore, since it contains 0.03 to 10 parts by mass of one or more ultraviolet absorbers selected from the group consisting of the first and second ultraviolet absorbers with respect to 100 parts by mass of propylene resin, the effect of preventing discoloration is obtained. Furthermore, the bleed-out is also suppressed.
In the invention of [3], since propylene resin is used as the constituent resin, it is lightweight, excellent in mechanical strength and hardly broken, and excellent in heat resistance and moisture resistance and hardly deformed by heat or moisture. Further, 0.03 to 10 parts by mass of one or more light stabilizers selected from the group consisting of the first, second and third hindered amine light stabilizers are contained with respect to 100 parts by mass of the propylene resin. Therefore, discoloration is prevented in an environment with light from the light source, heat, and the like, and bleeding out is also suppressed. Further, since 0.03 to 10 parts by mass of the first ultraviolet absorber is contained with respect to 100 parts by mass of the propylene resin, the effect of preventing discoloration is further enhanced and bleeding out is also suppressed.
In the invention of [4], since propylene resin is used as the constituent resin, it is lightweight, excellent in mechanical strength and hardly broken, and excellent in heat resistance and moisture resistance, and is not easily deformed by heat or moisture. Further, containing 0.03 parts by mass to 10 parts by mass of one or more light stabilizers selected from the group consisting of the first, second and third hindered amine light stabilizers with respect to 100 parts by mass of the propylene resin, And since it does not contain an ultraviolet absorber, discoloration is prevented in an environment such as light or heat from the light source, and bleeding out is also suppressed.
In the invention of [5], since a light diffusing plate that prevents discoloration and suppresses bleed out is used, a high-quality surface light source device having excellent durability is provided.
In the invention of [6], since the light diffusing plate that is prevented from being discolored and suppressed from bleeding out is used, a high-quality liquid crystal display device excellent in durability is provided.
また、ADEKA社製アデカスタブLA−31等のベンゾトリアゾール系紫外線吸収剤をプロピレン樹脂製光拡散板に含有せしめた場合には、十分な変色防止効果が得られないことも判明した。
そこで、十分な変色防止効果が得られると共にブリードアウトを抑制できるプロピレン樹脂製光拡散板の開発が望まれる。
本発明は、かかる技術的背景に鑑みてなされたものであって、光源からの光や熱等のある環境下において変色が防止され、ブリードアウトが抑制された光拡散板およびその用途を提供することを目的とする。
前記目的を達成するために、本発明は以下の手段を提供する。
[1]プロピレン樹脂100質量部ならびに以下の式(I)で表される第1ヒンダードアミン系光安定剤、以下の式(II)で表される第2ヒンダードアミン系光安定剤および以下の式(XI)で表される第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤0.03質量部~10質量部を含有する樹脂組成物からなる光拡散板。
(式中、R11およびR12は、それぞれ独立に、水素原子、炭素原子数が1~24の直鎖アルキル基または炭素原子数が3~24の分岐アルキル基を表し、nは、1~100の整数である。)
(式中、R21は以下の式(V)で表される置換基を表す。)
(式中、R52はブチル基を表し、R53は以下の式(VI)で表される置換基を表す。)
(式中、R64は、水素原子、炭素原子数が1~12の直鎖アルキル基、炭素原子数が3~12の分岐アルキル基、炭素原子数が1~12の直鎖アルコキシル基または炭素原子数が3~12の分岐アルコキシル基を表す。)
(式中、R101およびR102は、それぞれ独立に、水素原子、炭素原子数が1~24の直鎖アルキル基または炭素原子数が3~24の分岐アルキル基を表す。)
[2]前記樹脂組成物は、前記プロピレン樹脂100質量部に対して更に以下の式(III)で表される第1紫外線吸収剤および以下の式(IV)で表される第2紫外線吸収剤からなる群より選ばれる1種以上の紫外線吸収剤を0.03質量部~10質量部含有する前項1に記載の光拡散板。
(式中、R31、R32およびR33は、それぞれ独立に、水素原子、メチル基、tert−ブチル基、tert−オクチル基、−O(CH2)7CH3または以下の式(VII)で表される置換基を表し、Xは水素原子または塩素原子を表す。)
(式中、R41、R42、R43およびR44は、それぞれ独立に、水素原子、シアノ基、フェニル基、−COOCH3、−COOC2H5、以下の式(VIII)で表される置換基、以下の式(IX)で表される置換基または以下の式(X)で表される置換基を表す。)
(式中、R105およびR106はそれぞれ、−COOC2H5を表す。)
[3]前記樹脂組成物は、前記プロピレン樹脂100質量部に対して更に以下の式(III)で表される第1紫外線吸収剤を0.03質量部~10質量部含有する前項1に記載の光拡散板。
(式中、R31、R32およびR33は、それぞれ独立に、水素原子、メチル基、tert−ブチル基、tert−オクチル基、−O(CH2)7CH3または以下の式(VII)で表される置換基を表し、Xは水素原子または塩素原子を表す。)
[4]プロピレン樹脂100質量部ならびに以下の式(I)で表される第1ヒンダードアミン系光安定剤、以下の式(II)で表される第2ヒンダードアミン系光安定剤および以下の式(XI)で表される第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤0.03質量部~10質量部を含有する樹脂組成物からなり、該樹脂組成物は紫外線吸収剤を含有しないものである光拡散板。
(式中、R11およびR12は、それぞれ独立に、水素原子、炭素原子数が1~24の直鎖アルキル基または炭素原子数が3~24の分岐アルキル基を表し、nは、1~100の整数である。)
(式中、R21は以下の式(V)で表される置換基を表す。)
(式中、R52はブチル基を表し、R53は以下の式(VI)で表される置換基を表す。)
(式中、R64は、水素原子、炭素原子数が1~12の直鎖アルキル基、炭素原子数が3~12の分岐アルキル基、炭素原子数が1~12の直鎖アルコキシル基または炭素原子数が3~12の分岐アルコキシル基を表す。)
(式中、R101およびR102は、それぞれ独立に、水素原子、炭素原子数が1~24の直鎖アルキル基または炭素原子数が3~24の分岐アルキル基を表す。)
[5]前項1~4のいずれか1項に記載の光拡散板と、該光拡散板の背面側に配置された複数の光源とを備える面光源装置。
[6]前項1~4のいずれか1項に記載の光拡散板と、該光拡散板の背面側に配置された複数の光源と、前記光拡散板の前面側に配置された液晶パネルとを備える液晶表示装置。
[1]の発明では、構成樹脂としてプロピレン樹脂を用いているから、軽量で、機械的強度に優れていて壊れ難く、また耐熱性および耐湿性に優れていて熱や湿気により変形しにくい。また、プロピレン樹脂100質量部に対して前記第1、第2および第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤を0.03質量部~10質量部含有する樹脂組成物からなるから、光源からの光や熱等のある環境下において変色が防止され、ブリードアウトも抑制されている。
[2]の発明では、構成樹脂としてプロピレン樹脂を用いているから、軽量で、機械的強度に優れていて壊れ難く、また耐熱性および耐湿性に優れていて熱や湿気により変形しにくい。また、プロピレン樹脂100質量部に対して前記第1、第2および第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤を0.03質量部~10質量部含有しているから、光源からの光や熱等のある環境下において変色が防止され、ブリードアウトも抑制されている。更に、プロピレン樹脂100質量部に対して前記第1および第2紫外線吸収剤からなる群より選ばれる1種以上の紫外線吸収剤を0.03質量部~10質量部含有するから、変色防止効果がさらに高められ、ブリードアウトも抑制されている。
[3]の発明では、構成樹脂としてプロピレン樹脂を用いているから、軽量で、機械的強度に優れていて壊れ難く、また耐熱性および耐湿性に優れていて熱や湿気により変形しにくい。また、プロピレン樹脂100質量部に対して前記第1、第2および第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤を0.03質量部~10質量部含有しているから、光源からの光や熱等のある環境下において変色が防止され、ブリードアウトも抑制されている。更に、プロピレン樹脂100質量部に対して前記第1紫外線吸収剤を0.03質量部~10質量部含有するから、変色防止効果がより高められ、ブリードアウトも抑制されている。
[4]の発明では、構成樹脂としてプロピレン樹脂を用いているから、軽量で、機械的強度に優れていて壊れ難く、また耐熱性および耐湿性に優れていて熱や湿気により変形しにくい。また、プロピレン樹脂100質量部に対して前記第1、第2および第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤を0.03質量部~10質量部含有し、且つ紫外線吸収剤を含有しないから、光源からの光や熱等のある環境下において変色が防止され、ブリードアウトも抑制されている。
[5]の発明では、光拡散板として変色が防止され、ブリードアウトが抑制されているものが用いられているから、耐久性に優れた高品質の面光源装置が提供される。
[6]の発明では、光拡散板として変色が防止され、ブリードアウトが抑制されているものが用いられているから、耐久性に優れた高品質の液晶表示装置が提供される。 However, according to the study by the present inventors, for example, when a benzotriazole ultraviolet absorber such as ADEKA STAB LA-31 manufactured by ADEKA is included in a light diffusion plate made of propylene resin, the ultraviolet absorber is immediately Turned out to bleed out. When the ultraviolet absorber bleeds out, the transparency of the light diffusing plate is lowered and a good image cannot be obtained.
It has also been found that when a benzotriazole ultraviolet absorber such as Adeka Stab LA-31 manufactured by ADEKA is included in a light diffusion plate made of propylene resin, a sufficient discoloration preventing effect cannot be obtained.
Therefore, it is desired to develop a light diffusion plate made of propylene resin that can obtain a sufficient discoloration preventing effect and can suppress bleed out.
The present invention has been made in view of such a technical background, and provides a light diffusing plate in which discoloration is prevented and bleeding out is suppressed under an environment such as light or heat from a light source and its use. For the purpose.
In order to achieve the above object, the present invention provides the following means.
[1] 100 parts by mass of propylene resin, a first hindered amine light stabilizer represented by the following formula (I), a second hindered amine light stabilizer represented by the following formula (II), and the following formula (XI) A light diffusing plate comprising a resin composition containing 0.03 parts by mass to 10 parts by mass of one or more light stabilizers selected from the group consisting of third hindered amine light stabilizers.
(Wherein R 11 and R 12 each independently represents a hydrogen atom, a linear alkyl group having 1 to 24 carbon atoms or a branched alkyl group having 3 to 24 carbon atoms, and n represents 1 to It is an integer of 100.)
(In the formula, R 21 represents a substituent represented by the following formula (V).)
(In the formula, R 52 represents a butyl group, and R 53 represents a substituent represented by the following formula (VI).)
(In the formula, R 64 represents a hydrogen atom, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 3 to 12 carbon atoms, a linear alkoxyl group having 1 to 12 carbon atoms, or carbon. Represents a branched alkoxyl group having 3 to 12 atoms.)
(In the formula, R 101 and R 102 each independently represent a hydrogen atom, a linear alkyl group having 1 to 24 carbon atoms, or a branched alkyl group having 3 to 24 carbon atoms.)
[2] The resin composition further includes a first ultraviolet absorber represented by the following formula (III) and a second ultraviolet absorber represented by the following formula (IV) with respect to 100 parts by mass of the propylene resin. 2. The light diffusing plate according to item 1 above, containing 0.03 to 10 parts by mass of one or more ultraviolet absorbers selected from the group consisting of:
(Wherein R 31 , R 32 and R 33 each independently represents a hydrogen atom, a methyl group, a tert-butyl group, a tert-octyl group, —O (CH 2 ) 7 CH 3 or the following formula (VII): And X represents a hydrogen atom or a chlorine atom.)
(In the formula, R 41 , R 42 , R 43 and R 44 are each independently represented by a hydrogen atom, a cyano group, a phenyl group, —COOCH 3 , —COOC 2 H 5 , and the following formula (VIII): A substituent, a substituent represented by the following formula (IX) or a substituent represented by the following formula (X) is represented.)
(Wherein R 105 and R 106 each represent —COOC 2 H 5 )
[3] The resin composition according to item 1 above, further comprising 0.03 to 10 parts by mass of a first ultraviolet absorber represented by the following formula (III) with respect to 100 parts by mass of the propylene resin. Light diffusing plate.
(Wherein R 31 , R 32 and R 33 each independently represents a hydrogen atom, a methyl group, a tert-butyl group, a tert-octyl group, —O (CH 2 ) 7 CH 3 or the following formula (VII): And X represents a hydrogen atom or a chlorine atom.)
[4] 100 parts by mass of propylene resin, a first hindered amine light stabilizer represented by the following formula (I), a second hindered amine light stabilizer represented by the following formula (II), and the following formula (XI) ) And a resin composition containing 0.03 to 10 parts by mass of one or more light stabilizers selected from the group consisting of third hindered amine light stabilizers. The resin composition absorbs ultraviolet rays. A light diffusing plate that does not contain an agent.
(Wherein R 11 and R 12 each independently represents a hydrogen atom, a linear alkyl group having 1 to 24 carbon atoms or a branched alkyl group having 3 to 24 carbon atoms, and n represents 1 to It is an integer of 100.)
(In the formula, R 21 represents a substituent represented by the following formula (V).)
(In the formula, R 52 represents a butyl group, and R 53 represents a substituent represented by the following formula (VI).)
(In the formula, R 64 represents a hydrogen atom, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 3 to 12 carbon atoms, a linear alkoxyl group having 1 to 12 carbon atoms, or carbon. Represents a branched alkoxyl group having 3 to 12 atoms.)
(In the formula, R 101 and R 102 each independently represent a hydrogen atom, a linear alkyl group having 1 to 24 carbon atoms, or a branched alkyl group having 3 to 24 carbon atoms.)
[5] A surface light source device comprising the light diffusing plate according to any one of items 1 to 4 and a plurality of light sources arranged on the back side of the light diffusing plate.
[6] The light diffusing plate according to any one of 1 to 4 above, a plurality of light sources arranged on the back side of the light diffusing plate, a liquid crystal panel arranged on the front side of the light diffusing plate, A liquid crystal display device comprising:
In the invention of [1], since propylene resin is used as the constituent resin, it is lightweight, excellent in mechanical strength and hardly broken, and excellent in heat resistance and moisture resistance, and is not easily deformed by heat or moisture. A resin containing 0.03 to 10 parts by mass of one or more light stabilizers selected from the group consisting of the first, second and third hindered amine light stabilizers with respect to 100 parts by mass of propylene resin Since it consists of a composition, discoloration is prevented in a certain environment, such as light from a light source and heat, and bleed-out is also suppressed.
In the invention of [2], since propylene resin is used as the constituent resin, it is lightweight, excellent in mechanical strength and hardly broken, and excellent in heat resistance and moisture resistance and hardly deformed by heat or moisture. Further, 0.03 to 10 parts by mass of one or more light stabilizers selected from the group consisting of the first, second and third hindered amine light stabilizers are contained with respect to 100 parts by mass of the propylene resin. Therefore, discoloration is prevented in an environment with light from the light source, heat, and the like, and bleeding out is also suppressed. Furthermore, since it contains 0.03 to 10 parts by mass of one or more ultraviolet absorbers selected from the group consisting of the first and second ultraviolet absorbers with respect to 100 parts by mass of propylene resin, the effect of preventing discoloration is obtained. Furthermore, the bleed-out is also suppressed.
In the invention of [3], since propylene resin is used as the constituent resin, it is lightweight, excellent in mechanical strength and hardly broken, and excellent in heat resistance and moisture resistance and hardly deformed by heat or moisture. Further, 0.03 to 10 parts by mass of one or more light stabilizers selected from the group consisting of the first, second and third hindered amine light stabilizers are contained with respect to 100 parts by mass of the propylene resin. Therefore, discoloration is prevented in an environment with light from the light source, heat, and the like, and bleeding out is also suppressed. Further, since 0.03 to 10 parts by mass of the first ultraviolet absorber is contained with respect to 100 parts by mass of the propylene resin, the effect of preventing discoloration is further enhanced and bleeding out is also suppressed.
In the invention of [4], since propylene resin is used as the constituent resin, it is lightweight, excellent in mechanical strength and hardly broken, and excellent in heat resistance and moisture resistance, and is not easily deformed by heat or moisture. Further, containing 0.03 parts by mass to 10 parts by mass of one or more light stabilizers selected from the group consisting of the first, second and third hindered amine light stabilizers with respect to 100 parts by mass of the propylene resin, And since it does not contain an ultraviolet absorber, discoloration is prevented in an environment such as light or heat from the light source, and bleeding out is also suppressed.
In the invention of [5], since a light diffusing plate that prevents discoloration and suppresses bleed out is used, a high-quality surface light source device having excellent durability is provided.
In the invention of [6], since the light diffusing plate that is prevented from being discolored and suppressed from bleeding out is used, a high-quality liquid crystal display device excellent in durability is provided.
図1は、本発明に係る液晶表示装置の一実施形態を示す模式図である。
図2は、光拡散板の表面に形成される凹凸形状の一例を示す断面図である。
図3は、光拡散板の表面に形成される凹凸形状の他の例を示す断面図である。
図4は、略半円凸部の他の例を示す斜視図である。
図5は、光拡散板の表面に形成される凹凸形状のさらに他の例を示す断面図である。
図6は、図5の略三角形凸部を示す斜視図である。
図7は、略三角形凸部の他の例を示す斜視図である。 FIG. 1 is a schematic view showing an embodiment of a liquid crystal display device according to the present invention.
FIG. 2 is a cross-sectional view showing an example of the concavo-convex shape formed on the surface of the light diffusion plate.
FIG. 3 is a cross-sectional view showing another example of the uneven shape formed on the surface of the light diffusion plate.
FIG. 4 is a perspective view showing another example of a substantially semicircular convex portion.
FIG. 5 is a cross-sectional view showing still another example of the uneven shape formed on the surface of the light diffusion plate.
FIG. 6 is a perspective view showing the substantially triangular convex portion of FIG.
FIG. 7 is a perspective view showing another example of the substantially triangular convex portion.
図2は、光拡散板の表面に形成される凹凸形状の一例を示す断面図である。
図3は、光拡散板の表面に形成される凹凸形状の他の例を示す断面図である。
図4は、略半円凸部の他の例を示す斜視図である。
図5は、光拡散板の表面に形成される凹凸形状のさらに他の例を示す断面図である。
図6は、図5の略三角形凸部を示す斜視図である。
図7は、略三角形凸部の他の例を示す斜視図である。 FIG. 1 is a schematic view showing an embodiment of a liquid crystal display device according to the present invention.
FIG. 2 is a cross-sectional view showing an example of the concavo-convex shape formed on the surface of the light diffusion plate.
FIG. 3 is a cross-sectional view showing another example of the uneven shape formed on the surface of the light diffusion plate.
FIG. 4 is a perspective view showing another example of a substantially semicircular convex portion.
FIG. 5 is a cross-sectional view showing still another example of the uneven shape formed on the surface of the light diffusion plate.
FIG. 6 is a perspective view showing the substantially triangular convex portion of FIG.
FIG. 7 is a perspective view showing another example of the substantially triangular convex portion.
本発明に係る液晶表示装置の一実施形態を図1に示す。図1において、(30)は液晶表示装置、(11)は液晶セル、(12)(13)は偏光板、(1)は面光源装置(バックライト)である。前記液晶セル(11)の上下両側にそれぞれ偏光板(12)(13)が配置され、これら構成部材(11)(12)(13)によって画像表示部としての液晶パネル(20)が構成されている。なお、前記液晶セル(11)としては、カラー画像を表示可能なものが好ましく用いられる。
前記面光源装置(1)は、前記液晶パネル(20)の下側の偏光板(13)の下面側(背面側)に配置されている。即ち、この液晶表示装置(30)は、直下型液晶表示装置である。
前記面光源装置(1)は、平面視矩形状で上面側(前面側)が開放された薄箱型形状のランプボックス(5)と、該ランプボックス(5)内に相互に離間して配置された複数の光源(2)と、これら複数の光源(2)の上方側(前面側)に配置された光拡散板(3)とを備えている。前記光拡散板(3)は、前記ランプボックス(5)に対してその開放面を塞ぐように載置されて固定されている。また、前記ランプボックス(5)の内面には光反射層(図示しない)が設けられている。前記光源(2)としては、特に限定されるものではないが、例えば冷陰極管、熱陰極管、EEFL(外部電極蛍光ランプ)等の線状光源の他、発光ダイオード(LED)等の点状光源などが用いられる。
前記光拡散板(3)は、プロピレン樹脂100質量部ならびに前記式(I)で表される第1ヒンダードアミン系光安定剤、前記式(II)で表される第2ヒンダードアミン系光安定剤および前記式(XI)で表される第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤(HALS)0.03質量部~10質量部を含有する樹脂組成物からなる。かかる光安定剤は、前記第一、第二および第三ヒンダードアミン系光安定剤からなる群より選ばれる1種であってもよいし、該群より選ばれる2種以上であってもよい。
上記構成に係る光拡散板(3)は、構成樹脂としてプロピレン樹脂を用いているから、軽量で、機械的強度に優れていて壊れ難く、また耐熱性および耐湿性に優れていて熱や湿気により変形しにくい。また、プロピレン樹脂100質量部に対して前記第1、第2および第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤を0.03質量部~10質量部含有する樹脂組成物からなるから、光源からの光や熱等のある環境下において変色が防止され、ブリードアウトも抑制されている。従って、前記面光源装置(1)は耐久性に優れていて高品質である。なお、前記特定の光安定剤の含有量は、プロピレン樹脂100質量部に対して0.05質量部~5質量部であるのが好ましく、更にはプロピレン樹脂100質量部に対して0.10質量部~2質量部であるのが特に好ましい。
本発明において、前記光拡散板(3)は、プロピレン樹脂100質量部に対して、前記第1、第2および第3からなる群より選ばれる1種以上の光安定剤を0.03質量部~10質量部、前記第1および第2紫外線吸収剤からなる群より選ばれる1種以上の紫外線吸収剤を0.03質量部~10質量部含有する樹脂組成物からなるのが好ましい。この場合には、前記ヒンダードアミン系光安定剤(HALS)に加えて、さらに特定の紫外線吸収剤を特定量含有するので、ブリードアウトを抑制しつつ、変色防止効果をさらに高めることができる。なお、前記特定の光安定剤の含有量は、プロピレン樹脂100質量部に対して0.05質量部~5質量部であるのが好ましく、更にはプロピレン樹脂100質量部に対して0.10質量部~2質量部であるのが特に好ましい。また、前記特定の紫外線吸収剤の含有量は、プロピレン樹脂100質量部に対して0.05質量部~5質量部であるのが好ましく、更にはプロピレン樹脂100質量部に対して0.10質量部~2質量部であるのが特に好ましい。また、前記特定の紫外線吸収剤としては、前記一般式(III)で表される第1紫外線吸収剤(1種であってもよいし2種以上であってもよい)を用いるのが好ましく、この場合には、前記第2紫外線吸収剤を用いた場合と比較して、優れた変色防止効果をより長期間にわたって維持できる。
或いは、前記光拡散板(3)は、プロピレン樹脂100質量部に対して前記第1、第2および第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤を0.03質量部~10質量部含有する樹脂組成物からなり、該樹脂組成物は紫外線吸収剤(UVA)を含有しないものであるのが好ましい。この場合には、ブリードアウトがより抑制される。この紫外線吸収剤(UVA)を含有せしめない構成においても、プロピレン樹脂100質量部に対して前記特定の光安定剤を0.05質量部~5質量部含有せしめるのが好ましく、更にはプロピレン樹脂100質量部に対して前記特定の光安定剤を0.10質量部~2質量部含有せしめるのが特に好ましい。
前記一般式(I)で表される第1ヒンダードアミン系光安定剤としては、特に限定されるものではないが、例えば、チヌビン622LD(チバ・ジャパン社製)等が挙げられる。前記チヌビン622LDは、式(I)において、R11が水素原子、R12がメチル基である。
前記一般式(II)で表される第2ヒンダードアミン系光安定剤としては、特に限定されるものではないが、例えば、キマソーブ119FL(チバ・ジャパン社製)等が挙げられる。なお、前記キマソーブ119FLは、式(II)で表される第2ヒンダードアミン系光安定剤90質量%と、式(I)においてR11が水素原子、R12がメチル基である第1ヒンダードアミン系光安定剤10質量%との混合物である。
なお、実施例で用いた、チヌビンXT850FF(チバ・ジャパン社製)、チヌビンXT855FF(チバ・ジャパン社製)は、式(I)で表される第1ヒンダードアミン系光安定剤および式(XI)で表される第3ヒンダードアミン系光安定剤からなる群より選ばれる少なくとも1種の光安定剤である。
前記一般式(III)で表される第1紫外線吸収剤としては、特に限定されるものではないが、例えば、チヌビン234(チバ・ジャパン社製)、チヌビン328(チバ・ジャパン社製)、SEESORB703(シプロ化成社製)、SEESORB707(シプロ化成社製)等が挙げられる。
前記チヌビン234は、式(III)において、R31が式(VII)で表される置換基、R32が水素原子、R33が式(VII)で表される置換基、Xが水素原子である。
前記チヌビン328は、式(III)において、R31がtert−オクチル基、R32が水素原子、R33がtert−オクチル基、Xが水素原子である。
前記SEESORB703は、式(III)において、R31がtert−ブチル基、R32が水素原子、R33がメチル基、Xが塩素原子である。
前記SEESORB707は、式(III)において、R31が水素原子、R32が−O(CH2)7CH3基、R33が水素原子、Xが水素原子である。
前記式(IV)で表される第2紫外線吸収剤としては、特に限定されるものではないが、例えば、SEESORB501(シプロ化成社製)、SEESORB502(シプロ化成社製)、PR25(クラリアント社製)、B−CAP(クラリアント社製)等が挙げられる。
前記SEESORB501は、式(IV)において、R41がフェニル基、R42がフェニル基、R43がシアノ基、R44が−COOC2H5基である。
前記SEESORB502は、式(IV)において、R41がフェニル基、R42がフェニル基、R43がシアノ基、R44が式(IX)で表される置換基である。
前記PR25は、式(IV)において、R41が−COOCH3基、R42が−COOCH3基、R43が式(VIII)で表される置換基、R44が水素原子である。
前記B−CAPは、式(IV)において、R41が式(X)で表される置換基、R42が水素原子、R43、R44、R105、R106はいずれも−COOC2H5基である。
前記プロピレン樹脂としては、プロピレンを単独で重合させて得られるホモポリプロピレンであってもよいし、プロピレンおよびこれと共重合し得る共重合成分の共重合体であってもよい。十分な剛性が得られる点で、前記プロピレン樹脂中のプロピレン単位の含有率は75質量%以上であるのが好ましい。前記共重合成分としては、特に限定されるものではないが、例えばエチレン、1−ブテン等のα−オレフィンなどが挙げられる。
前記プロピレン樹脂としては、プロピレン単位含有率75~100質量%、エチレン単位含有率0~15質量%、および1−ブテン単位含有率0~25質量%からなるものが好ましい。また、前記プロピレン樹脂としては、プロピレン単位含有率95~100質量%、エチレン単位含有率0~5質量%、および1−ブテン単位含有率0~5質量%からなるものがより好ましい。更には、前記プロピレン樹脂としては、プロピレン単位含有率99~100質量%、エチレン単位含有率0~1質量%、および1−ブテン単位含有率0~1質量%からなるもの(ホモポリプロピレンを含む)が最も好ましい。
前記光拡散板(3)を構成するプロピレン樹脂に、さらに光拡散粒子および/または造核剤が配合されるのが好ましい。
前記光拡散粒子(光拡散剤)としては、前記プロピレン樹脂と屈折率が異なる粒子であって、該粒子を含有する光拡散板を透過する光を拡散し得るものであれば、特に限定されない。例えば、ガラス粒子、ガラス繊維、シリカ粒子、水酸化アルミニウム粒子、炭酸カルシウム粒子、硫酸バリウム粒子、酸化チタン粒子、タルク等の無機粒子であってもよいし、スチレン系重合体粒子、アクリル系重合体粒子、シロキサン系重合体粒子等の有機粒子であってもよい。
前記光拡散粒子としては、通常、その体積平均粒子径が0.5μm~25μmの範囲にあるものが用いられる。中でも、体積平均粒子径の好ましい下限値は0.7μmであり、また体積平均粒子径の好ましい上限値は20μmであり、特に好ましい上限値は10μmである。なお、体積平均粒子径(D50)は、全粒子の粒子径および体積を測定し、小さい粒子径のものから順次体積を積算し、該積算体積が全粒子の合計体積に対して50%となる粒子の粒子径である。
前記光拡散板(3)における光拡散粒子の含有量は、前記プロピレン樹脂100質量部に対して0.01質量部~20質量部の範囲に設定されるのが好ましい。該含有量が0.01質量部以上であることで光拡散効果が十分に得られるものとなると共に、20質量部以下であることで十分な機械的強度を確保できる。
また、前記造核剤としては、特に限定されるものではないが、例えば、ソルビトール系造核剤、有機リン酸塩系造核剤、カルボン酸の金属塩造核剤、ロジン系造核剤等を使用できる。
前記光拡散板(3)における造核剤の含有量は、前記プロピレン樹脂100質量部に対して0.01質量部~1.0質量部の範囲が好ましい。0.01質量部以上であることで表面に白点等の出現が抑制され、外観の良好な光拡散板を得ることができると共に、1.0質量部以下であることで造核剤の分散不良による光学特性の低下およびコスト増大を抑制できる。
前記光拡散板(3)を構成する樹脂組成物に、必要に応じて、熱安定剤、酸化防止剤、耐候剤、蛍光増白剤、加工安定剤等の添加剤を含有せしめてもよい。
また、前記光拡散板(3)の大きさは、特に限定されるものではなく、例えば目的とする面光源装置(1)や液晶表示装置(30)の大きさに応じて適宜設定されるものであるが、中でも、20型(縦30cm、横40cm)以上の大きさに設計される光拡散板として特に好適である。
なお、前記光拡散板(3)の厚さは、通常0.1mm~3mm、好ましくは0.5mm~3mmの範囲に設定される。
本発明の光拡散板(3)は、例えば次のようにして製造できる。前記組成からなる樹脂組成物を、押出成形する押出成形法、射出成形する射出成形法、熱プレスする熱プレス法等の公知の成形法によって製造できる。前記製造方法は、その例を示したものに過ぎず、本発明の光拡散板(3)は、このような製造方法で製造されたものに限定されるものではない。
前記光拡散板(3)は、図1に示すように両面が平坦面であってもよいし、少なくとも片面が、レンチキュラーレンズ、フレネルレンズ、プリズムレンズ等の凹凸が形成された面であってもよいし、少なくとも片面が艶消し面であってもよい。
前記艶消し面とする場合には、その表面の十点平均粗さ(Rz)は1μm~100μmに設定されるのが好ましく、これにより光拡散板(3)の当該表面(艶消し面)の傷付き発生を十分に抑制することができる。
図2に、本発明の光拡散板(3)の表面(片面または両面)(6b)に形成される凹凸形状の一例を示す。図2では、断面形状が三角形凸部(V字溝)の凹凸形状が採用されている。この図2の例では、隣り合う三角形凸部(71)が間隔をあけることなく連続状に形成されている(換言すれば、隣り合うV字溝(72)が連続状に形成されている)が、特にこのような構成に限定されるものではなく、隣り合う三角形凸部が間隔(d1)をあけた非連続状に構成されていてもよい。前記三角形凸部(71)のピッチ間隔(P1)は30μm~500μmの範囲であるのが好ましい。また、前記三角形凸部(71)の高さ(H1)は30μm~500μmの範囲であるのが好ましい。前記隣り合う三角形凸部(71)の離間間隔(d1:図示せず)は1μm~10μmの範囲であるのが好ましい。また、前記三角形凸部(71)の頂部の頂角(θ)は10~100°であるのが好ましく、中でも10~90°であるのがより好ましい。
図3に、光拡散板(3)の表面(片面または両面)(6b)に形成される凹凸形状の他の例を示す。図3では、断面形状が略半円形状である略半円凸部(81)を含む凹凸形状が採用されている。この図3の例では、隣り合う略半円凸部(81)が間隔(d2)をあけて非連続状に形成されているが、特にこのような構成に限定されるものではなく、隣り合う略半円凸部(81)が間隔をあけることなく連続状に(即ちd2=0)構成されていてもよい。前記略半円凸部(81)のピッチ間隔(P2)は30μm~500μmの範囲であるのが好ましい。また、前記略半円凸部(81)の高さ(H2)は30μm~500μmの範囲であるのが好ましい。また、前記隣り合う略半円凸部(81)の離間間隔(d2)は1μm~10μmの範囲であるのが好ましい。なお、前記略半円凸部(81)とは、図3に示すような断面形状が半円形状であるものを含む他、例えば図4に示すシリンドリカルレンズ(82)のように、円柱体をその中心軸線に平行であって、該中心軸線を含まない平面で切断した場合の断面のいずれかの弧状である形状であってもよいし、或いは断面が半楕円弧状や、該半楕円弧状の一部である扁平湾曲状等の形状であってもよい。
また、前記光拡散板(3)の表面(片面または両面)(6b)に形成される凹凸形状としては、上記略半円凸部が反転した略半円凹溝を備えた形状であってもよい。前記略半円凹溝とは、断面形状が半円形状であるものを含む他、例えばシリンドリカルレンズのように、円柱体をその中心軸線に平行であって、該中心軸線を含まない平面で切断した場合の断面のいずれかの弧状である形状であってもよいし、或いは断面が半楕円弧状や、該半楕円弧状の一部である扁平湾曲状等の形状であってもよい。
図5に、光拡散板(3)の表面(片面または両面)(6b)に形成される凹凸形状のさらに他の例を示す。図5では、断面形状が略三角形形状である略三角形凸部(91)を含む凹凸形状が採用されている。前記略三角形凸部(91)の断面形状における左右の斜辺は、いずれも先端側が直線であり、基端側(底辺側)が曲線(中央部で側方に向けて膨らむ曲線)である。即ち、前記略三角形凸部(91)の左右の斜面は、先端側の直線部(92)と、基端側の曲線部(93)とからなる。この図5の例では、隣り合う略三角形凸部(91)が間隔(d3)をあけて非連続状に形成されているが、特にこのような構成に限定されるものではなく、隣り合う略三角形凸部(91)が間隔をあけることなく連続状に(即ちd3=0)構成されていてもよい。前記略三角形凸部(91)のピッチ間隔(P3)は30μm~500μmの範囲であるのが好ましい。また、前記略三角形凸部(91)の高さ(H3)は30μm~500μmの範囲であるのが好ましい。また、前記隣り合う略三角形凸部(91)の離間間隔(d3)は1μm~10μmの範囲であるのが好ましい。前記略三角形凸部(91)の頂角(α)は10°~100°であるのが好ましく、中でも10°~90°であるのがより好ましい。前記曲線部(93)の曲線は、例えば、円弧状の一部、楕円弧状の一部であってもよい。前記円弧状の一部としては、例えばシリンドリカルレンズのように、円柱体をその中心軸線に平行であって、該中心軸線を含まない平面で切断した場合の断面のいずれかの弧状である形状等が挙げられる。なお、上記実施形態(図5、図6)では、前記略三角形凸部(91)としては、先端側の直線部(92)に基端側の曲線部(93)が連接されてなる斜面を備えた構成が採用されているが、特にこのような構成に限定されるものではなく、例えば図7に示すように、直線部を有さずに曲線部(93)のみからなる斜面を備えた構成を採用してもよい。
前記凹凸形状の凸部のピッチ間隔(P1)(P2)(P3)は、光拡散板(3)の全体にわたって必ずしも一定である必要はなく、部分的に又は全体にわたって隣り合う凸部(71)(81)(91)間で異なっていてもよい。また、前記凹凸形状の凸部の高さ(H1)(H2)(H3)も、光拡散板(3)の全体にわたって必ずしも一定である必要はなく、部分的に又は全体にわたって隣り合う凸部(71)(81)(91)間で異なっていてもよい。前記凹凸形状の頂角(θ)(α)及び間隔(d1)(d2)(d3)についても同様に、光拡散板(3)の全体にわたって必ずしも一定である必要はなく、部分的に又は全体にわたって隣り合う凸部(71)(81)(91)間で異なっていてもよい。
また、前記光拡散板(3)の表面に凹凸を形成させる方法としては、例えば光拡散板を押出成形により製造する場合であれば、表面側になる層を構成する樹脂に不溶の樹脂粒子を含有せしめて押出成形する方法、押出直後に凹凸形状が表面に付与された転写ロールを接触せしめて凹凸を押出板(光拡散板)の表面に転写する方法等が挙げられる。また、光拡散板を射出成形や熱プレスにより製造する場合であれば、成形面に凹凸形状が付与された金型を用いて凹凸を転写する方法等が挙げられる。
本発明に係る光拡散板(3)、面光源装置(1)および液晶表示装置(30)は、上記実施形態のものに特に限定されるものではなく、請求の範囲内であれば、その精神を逸脱するものでない限りいかなる設計的変更をも許容するものである。 An embodiment of a liquid crystal display device according to the present invention is shown in FIG. In FIG. 1, (30) is a liquid crystal display device, (11) is a liquid crystal cell, (12) and (13) are polarizing plates, and (1) is a surface light source device (backlight). Polarizing plates (12) and (13) are respectively arranged on the upper and lower sides of the liquid crystal cell (11), and a liquid crystal panel (20) as an image display unit is constituted by these constituent members (11), (12) and (13). Yes. In addition, as the liquid crystal cell (11), those capable of displaying a color image are preferably used.
The said surface light source device (1) is arrange | positioned at the lower surface side (back side) of the polarizing plate (13) below the said liquid crystal panel (20). That is, this liquid crystal display device (30) is a direct liquid crystal display device.
The surface light source device (1) is a thin box-shaped lamp box (5) having a rectangular shape in plan view and having an upper surface side (front surface side) opened, and the lamp box (5) spaced apart from each other. And a light diffusion plate (3) disposed on the upper side (front side) of the plurality of light sources (2). The said light diffusing plate (3) is mounted and fixed with respect to the said lamp box (5) so that the open surface may be block | closed. A light reflecting layer (not shown) is provided on the inner surface of the lamp box (5). Although it does not specifically limit as said light source (2), For example, in addition to linear light sources, such as a cold-cathode tube, a hot cathode tube, and EEFL (external electrode fluorescent lamp), dot-like, such as light emitting diodes (LED) A light source or the like is used.
The light diffusion plate (3) includes 100 parts by mass of a propylene resin, a first hindered amine light stabilizer represented by the formula (I), a second hindered amine light stabilizer represented by the formula (II), and the It consists of a resin composition containing 0.03 to 10 parts by mass of one or more light stabilizers (HALS) selected from the group consisting of third hindered amine light stabilizers represented by the formula (XI). The light stabilizer may be one selected from the group consisting of the first, second and third hindered amine light stabilizers, or two or more selected from the group.
Since the light diffusion plate (3) according to the above configuration uses propylene resin as a constituent resin, it is lightweight, excellent in mechanical strength and hard to break, and excellent in heat resistance and moisture resistance due to heat and moisture. Difficult to deform. A resin containing 0.03 to 10 parts by mass of one or more light stabilizers selected from the group consisting of the first, second and third hindered amine light stabilizers with respect to 100 parts by mass of propylene resin Since it consists of a composition, discoloration is prevented in a certain environment, such as light from a light source and heat, and bleed-out is also suppressed. Therefore, the surface light source device (1) has excellent durability and high quality. The content of the specific light stabilizer is preferably 0.05 to 5 parts by mass with respect to 100 parts by mass of the propylene resin, and further 0.10 parts by mass with respect to 100 parts by mass of the propylene resin. It is particularly preferably 2 to 2 parts by mass.
In this invention, the said light diffusing plate (3) is 0.03 mass part of 1 or more types of light stabilizers chosen from the group which consists of said 1st, 2nd and 3 with respect to 100 mass parts of propylene resin. It is preferably composed of a resin composition containing 0.03 parts by mass to 10 parts by mass of one or more kinds of ultraviolet absorbers selected from the group consisting of 10 parts by mass and the first and second ultraviolet absorbers. In this case, in addition to the hindered amine light stabilizer (HALS), a specific ultraviolet absorber is contained in a specific amount, so that the effect of preventing discoloration can be further enhanced while suppressing bleed out. The content of the specific light stabilizer is preferably 0.05 to 5 parts by mass with respect to 100 parts by mass of the propylene resin, and further 0.10 parts by mass with respect to 100 parts by mass of the propylene resin. It is particularly preferably 2 to 2 parts by mass. Further, the content of the specific ultraviolet absorber is preferably 0.05 parts by mass to 5 parts by mass with respect to 100 parts by mass of the propylene resin, and further 0.10 parts by mass with respect to 100 parts by mass of the propylene resin. It is particularly preferably 2 to 2 parts by mass. Moreover, as the specific ultraviolet absorber, it is preferable to use a first ultraviolet absorber represented by the general formula (III) (one kind or two or more kinds) may be used. In this case, compared with the case where the said 2nd ultraviolet absorber is used, the outstanding discoloration prevention effect can be maintained over a long period of time.
Alternatively, the light diffusing plate (3) contains 0.03 of one or more light stabilizers selected from the group consisting of the first, second, and third hindered amine light stabilizers with respect to 100 parts by mass of the propylene resin. The resin composition is preferably contained in an amount of 10 to 10 parts by mass, and the resin composition preferably contains no ultraviolet absorber (UVA). In this case, bleed out is further suppressed. Even in a configuration in which this ultraviolet absorber (UVA) is not contained, it is preferable to contain 0.05 to 5 parts by mass of the specific light stabilizer with respect to 100 parts by mass of the propylene resin. It is particularly preferable to contain 0.10 to 2 parts by mass of the specific light stabilizer with respect to parts by mass.
Although it does not specifically limit as a 1st hindered amine light stabilizer represented by the said general formula (I), For example, Tinuvin 622LD (made by Ciba Japan) etc. are mentioned. Tinuvin 622LD has the formula (I), wherein R 11 is a hydrogen atom and R 12 is a methyl group.
Although it does not specifically limit as a 2nd hindered amine light stabilizer represented by the said general formula (II), For example, Kimasorb 119FL (made by Ciba Japan) etc. are mentioned. The Kimasorb 119FL includes 90% by mass of a second hindered amine light stabilizer represented by the formula (II), and a first hindered amine light in which R 11 is a hydrogen atom and R 12 is a methyl group in the formula (I). It is a mixture with 10% by weight of stabilizer.
In addition, used in the examples, Tinuvin XT850FF (manufactured by Ciba Japan) and Tinuvin XT855FF (manufactured by Ciba Japan) are the first hindered amine light stabilizer represented by formula (I) and formula (XI). It is at least one light stabilizer selected from the group consisting of the third hindered amine light stabilizers represented.
Although it does not specifically limit as a 1st ultraviolet absorber represented by the said general formula (III), For example, Tinuvin 234 (made by Ciba Japan), Tinuvin 328 (made by Ciba Japan), SEESORB703 (Manufactured by Sipro Kasei Co., Ltd.), SEESORB 707 (manufactured by Sipro Kasei Co., Ltd.) and the like.
In the formula (III), the tinuvin 234 is a substituent in which R 31 is represented by the formula (VII), R 32 is a hydrogen atom, R 33 is a substituent represented by the formula (VII), and X is a hydrogen atom. is there.
In the tinuvin 328, in formula (III), R 31 is a tert-octyl group, R 32 is a hydrogen atom, R 33 is a tert-octyl group, and X is a hydrogen atom.
In the SEESORB 703, in the formula (III), R 31 is a tert-butyl group, R 32 is a hydrogen atom, R 33 is a methyl group, and X is a chlorine atom.
The SEESORB707, in Formula (III), R 31 is a hydrogen atom, R 32 is -O (CH 2) 7 CH 3 group, R 33 is a hydrogen atom, X is a hydrogen atom.
Although it does not specifically limit as a 2nd ultraviolet absorber represented by the said formula (IV), For example, SEESORB501 (made by Sipro Kasei), SEESORB502 (made by Sipro Kasei), PR25 (made by Clariant) , B-CAP (manufactured by Clariant) and the like.
The SEESORB501, in Formula (IV), R 41 is a phenyl group, R 42 is a phenyl group, R 43 is a cyano group, R 44 is -COOC 2 H 5 group.
The SEESORB 502 is a substituent represented by the formula (IV), wherein R 41 is a phenyl group, R 42 is a phenyl group, R 43 is a cyano group, and R 44 is a formula (IX).
The PR25, in Formula (IV), 3 groups R 41 is -COOCH, R 42 is -COOCH 3 group, the substituents R 43 is represented by formula (VIII), is R 44 is hydrogen atom.
In the formula (IV), R 41 is a substituent represented by the formula (X), R 42 is a hydrogen atom, R 43 , R 44 , R 105 , and R 106 are all —COOC 2 H in the formula (IV). Five groups.
The propylene resin may be a homopolypropylene obtained by polymerizing propylene alone, or may be a copolymer of propylene and a copolymerizable component that can be copolymerized therewith. The content of propylene units in the propylene resin is preferably 75% by mass or more in that sufficient rigidity is obtained. The copolymer component is not particularly limited, and examples thereof include α-olefins such as ethylene and 1-butene.
The propylene resin preferably has a propylene unit content of 75 to 100% by mass, an ethylene unit content of 0 to 15% by mass, and a 1-butene unit content of 0 to 25% by mass. The propylene resin is more preferably composed of a propylene unit content of 95 to 100% by mass, an ethylene unit content of 0 to 5% by mass, and a 1-butene unit content of 0 to 5% by mass. Further, the propylene resin includes a propylene unit content of 99 to 100% by mass, an ethylene unit content of 0 to 1% by mass, and a 1-butene unit content of 0 to 1% by mass (including homopolypropylene). Is most preferred.
It is preferable that light diffusing particles and / or nucleating agents are further blended with the propylene resin constituting the light diffusing plate (3).
The light diffusing particle (light diffusing agent) is not particularly limited as long as it is a particle having a refractive index different from that of the propylene resin and can diffuse light transmitted through a light diffusing plate containing the particle. For example, it may be inorganic particles such as glass particles, glass fibers, silica particles, aluminum hydroxide particles, calcium carbonate particles, barium sulfate particles, titanium oxide particles, talc, styrene polymer particles, acrylic polymers. Organic particles such as particles and siloxane polymer particles may be used.
As the light diffusing particles, those having a volume average particle diameter in the range of 0.5 μm to 25 μm are usually used. Among these, a preferable lower limit value of the volume average particle diameter is 0.7 μm, and a preferable upper limit value of the volume average particle diameter is 20 μm, and a particularly preferable upper limit value is 10 μm. The volume average particle diameter (D 50 ) is determined by measuring the particle diameter and volume of all the particles, and sequentially integrating the volumes from the smallest particle diameter, and the integrated volume is 50% with respect to the total volume of all the particles. The particle diameter of the resulting particles.
The content of the light diffusing particles in the light diffusing plate (3) is preferably set in the range of 0.01 to 20 parts by mass with respect to 100 parts by mass of the propylene resin. When the content is 0.01 parts by mass or more, the light diffusion effect can be sufficiently obtained, and when the content is 20 parts by mass or less, sufficient mechanical strength can be secured.
Further, the nucleating agent is not particularly limited. For example, sorbitol nucleating agent, organophosphate nucleating agent, metal salt nucleating agent of carboxylic acid, rosin nucleating agent, etc. Can be used.
The content of the nucleating agent in the light diffusing plate (3) is preferably in the range of 0.01 to 1.0 part by mass with respect to 100 parts by mass of the propylene resin. Appearance of white spots or the like on the surface is suppressed by being 0.01 parts by mass or more, and a light diffusing plate having a good appearance can be obtained, and dispersion of the nucleating agent is 1.0 parts by mass or less. It is possible to suppress a decrease in optical characteristics and an increase in cost due to defects.
You may make the resin composition which comprises the said light diffusing plate (3) contain additives, such as a heat stabilizer, antioxidant, a weathering agent, a fluorescent whitening agent, and a processing stabilizer, as needed.
The size of the light diffusing plate (3) is not particularly limited, and is appropriately set according to the size of the target surface light source device (1) or liquid crystal display device (30), for example. However, among them, it is particularly suitable as a light diffusing plate designed to have a size of 20 type (length 30 cm, width 40 cm) or more.
The thickness of the light diffusing plate (3) is usually set in the range of 0.1 mm to 3 mm, preferably 0.5 mm to 3 mm.
The light diffusing plate (3) of this invention can be manufactured as follows, for example. The resin composition having the above composition can be produced by a known molding method such as an extrusion molding method for extrusion molding, an injection molding method for injection molding, or a hot pressing method for hot pressing. The said manufacturing method is only what showed the example, and the light diffusing plate (3) of this invention is not limited to what was manufactured with such a manufacturing method.
The light diffusing plate (3) may be flat on both sides as shown in FIG. 1, or at least one side may be a surface on which irregularities such as a lenticular lens, a Fresnel lens, and a prism lens are formed. Alternatively, at least one surface may be a matte surface.
In the case of using the matte surface, the ten-point average roughness (Rz) of the surface is preferably set to 1 μm to 100 μm, and thereby the surface (matte surface) of the light diffusion plate (3) is set. The occurrence of scratches can be sufficiently suppressed.
In FIG. 2, an example of the uneven | corrugated shape formed in the surface (one side or both surfaces) (6b) of the light diffusing plate (3) of this invention is shown. In FIG. 2, a concavo-convex shape in which the cross-sectional shape is a triangular convex portion (V-shaped groove) is adopted. In the example of FIG. 2, adjacent triangular convex portions (71) are formed in a continuous manner without any interval (in other words, adjacent V-shaped grooves (72) are formed in a continuous shape). However, the configuration is not particularly limited to such a configuration, and adjacent triangular convex portions may be configured to be discontinuous with an interval (d 1 ). The pitch interval (P 1 ) of the triangular protrusions (71) is preferably in the range of 30 μm to 500 μm. The height (H 1 ) of the triangular convex portion (71) is preferably in the range of 30 μm to 500 μm. The spacing distance (d 1 : not shown) between the adjacent triangular protrusions (71) is preferably in the range of 1 μm to 10 μm. Further, the apex angle (θ) of the apex of the triangular convex portion (71) is preferably 10 to 100 °, and more preferably 10 to 90 °.
FIG. 3 shows another example of the uneven shape formed on the surface (one side or both sides) (6b) of the light diffusion plate (3). In FIG. 3, an uneven shape including a substantially semicircular convex portion (81) having a substantially semicircular cross-sectional shape is employed. In the example of FIG. 3, adjacent semi-circular protrusions (81) are formed in a discontinuous manner with an interval (d 2 ), but are not particularly limited to such a configuration. The matching semi-circular convex portions (81) may be formed continuously (that is, d 2 = 0) without any interval. The pitch interval (P 2 ) of the substantially semicircular protrusions (81) is preferably in the range of 30 μm to 500 μm. The height (H 2 ) of the substantially semicircular protrusion (81) is preferably in the range of 30 μm to 500 μm. In addition, the spacing (d 2 ) between the adjacent substantially semicircular convex portions (81) is preferably in the range of 1 μm to 10 μm. Note that the substantially semicircular convex portion (81) includes not only those having a semicircular cross-sectional shape as shown in FIG. 3, but also a cylindrical body such as a cylindrical lens (82) shown in FIG. It may be in the shape of any arc of the cross section when cut by a plane that is parallel to the central axis and does not include the central axis. Alternatively, the cross section may be a semi-elliptical arc or a semi-elliptical arc. It may be a part of a flat curved shape or the like.
Further, the uneven shape formed on the surface (one side or both sides) (6b) of the light diffusing plate (3) may be a shape provided with a substantially semicircular concave groove in which the substantially semicircular convex portion is inverted. Good. The substantially semi-circular groove includes those having a semicircular cross-sectional shape, and also, for example, a cylindrical body, such as a cylindrical lens, cut along a plane that is parallel to the central axis and does not include the central axis. In this case, the cross section may have any arc shape, or the cross section may have a semi-elliptical arc shape, a flat curved shape that is a part of the semi-elliptical arc shape, or the like.
In FIG. 5, the further another example of the uneven | corrugated shape formed in the surface (one side or both sides) (6b) of a light diffusing plate (3) is shown. In FIG. 5, the uneven | corrugated shape containing the substantially triangular convex part (91) whose cross-sectional shape is a substantially triangular shape is employ | adopted. The left and right hypotenuses in the cross-sectional shape of the substantially triangular convex portion (91) are both straight at the tip side and curved at the base end side (bottom side) (curved bulging sideways at the center). That is, the left and right slopes of the substantially triangular convex portion (91) are composed of a straight portion (92) on the distal end side and a curved portion (93) on the proximal end side. In the example of FIG. 5, the adjacent substantially triangular protrusions (91) are formed in a discontinuous manner with an interval (d 3 ), but are not particularly limited to such a configuration and are adjacent to each other. The substantially triangular convex portions (91) may be configured continuously (i.e., d 3 = 0) without any interval. The pitch interval (P 3 ) of the substantially triangular convex portions (91) is preferably in the range of 30 μm to 500 μm. The height (H 3 ) of the substantially triangular convex portion (91) is preferably in the range of 30 μm to 500 μm. Further, it is preferable that the spacing (d 3 ) between the adjacent substantially triangular convex portions (91) is in the range of 1 μm to 10 μm. The apex angle (α) of the substantially triangular convex portion (91) is preferably 10 ° to 100 °, and more preferably 10 ° to 90 °. The curve of the curved portion (93) may be, for example, an arc-shaped part or an elliptical arc-shaped part. As the arc-shaped part, for example, a cylindrical lens having a circular arc shape in a cross section when the cylindrical body is cut by a plane that is parallel to the central axis and does not include the central axis, etc. Is mentioned. In the above-described embodiment (FIGS. 5 and 6), the substantially triangular convex portion (91) is a slope formed by connecting the proximal-side curved portion (93) to the distal-side straight portion (92). However, the present invention is not particularly limited to such a configuration. For example, as shown in FIG. 7, a slope having only a curved portion (93) without a straight portion is provided. A configuration may be adopted.
The pitch interval (P 1 ) (P 2 ) (P 3 ) of the concavo-convex convex portions does not necessarily have to be constant over the entire light diffusing plate (3), and the convex portions adjacent to each other partially or entirely. (71) (81) (91) may be different. Further, the height (H 1 ) (H 2 ) (H 3 ) of the concavo-convex convex portions does not necessarily have to be constant over the entire light diffusion plate (3), and is partially or entirely adjacent. You may differ between convex parts (71) (81) (91). Similarly, the apex angle (θ) (α) and the interval (d 1 ) (d 2 ) (d 3 ) of the concavo-convex shape do not necessarily have to be constant throughout the light diffusion plate (3). Alternatively, the protrusions (71) (81) (91) which are adjacent to each other may be different.
Moreover, as a method of forming irregularities on the surface of the light diffusing plate (3), for example, if the light diffusing plate is produced by extrusion molding, resin particles insoluble in the resin constituting the surface side layer are used. Examples thereof include a method of containing and extrusion molding, a method of transferring a concavo-convex to the surface of an extruded plate (light diffusion plate) by bringing a transfer roll having a concavo-convex shape on the surface thereof into contact immediately after extrusion. Moreover, when manufacturing a light-diffusion board by injection molding or a hot press, the method etc. which transfer an unevenness | corrugation using the metal mold | die with which the uneven | corrugated shape was provided to the molding surface are mentioned.
The light diffusing plate (3), the surface light source device (1) and the liquid crystal display device (30) according to the present invention are not particularly limited to those of the above-described embodiment, and the spirit thereof is within the scope of the claims. Any design changes are allowed as long as they do not deviate from.
前記面光源装置(1)は、前記液晶パネル(20)の下側の偏光板(13)の下面側(背面側)に配置されている。即ち、この液晶表示装置(30)は、直下型液晶表示装置である。
前記面光源装置(1)は、平面視矩形状で上面側(前面側)が開放された薄箱型形状のランプボックス(5)と、該ランプボックス(5)内に相互に離間して配置された複数の光源(2)と、これら複数の光源(2)の上方側(前面側)に配置された光拡散板(3)とを備えている。前記光拡散板(3)は、前記ランプボックス(5)に対してその開放面を塞ぐように載置されて固定されている。また、前記ランプボックス(5)の内面には光反射層(図示しない)が設けられている。前記光源(2)としては、特に限定されるものではないが、例えば冷陰極管、熱陰極管、EEFL(外部電極蛍光ランプ)等の線状光源の他、発光ダイオード(LED)等の点状光源などが用いられる。
前記光拡散板(3)は、プロピレン樹脂100質量部ならびに前記式(I)で表される第1ヒンダードアミン系光安定剤、前記式(II)で表される第2ヒンダードアミン系光安定剤および前記式(XI)で表される第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤(HALS)0.03質量部~10質量部を含有する樹脂組成物からなる。かかる光安定剤は、前記第一、第二および第三ヒンダードアミン系光安定剤からなる群より選ばれる1種であってもよいし、該群より選ばれる2種以上であってもよい。
上記構成に係る光拡散板(3)は、構成樹脂としてプロピレン樹脂を用いているから、軽量で、機械的強度に優れていて壊れ難く、また耐熱性および耐湿性に優れていて熱や湿気により変形しにくい。また、プロピレン樹脂100質量部に対して前記第1、第2および第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤を0.03質量部~10質量部含有する樹脂組成物からなるから、光源からの光や熱等のある環境下において変色が防止され、ブリードアウトも抑制されている。従って、前記面光源装置(1)は耐久性に優れていて高品質である。なお、前記特定の光安定剤の含有量は、プロピレン樹脂100質量部に対して0.05質量部~5質量部であるのが好ましく、更にはプロピレン樹脂100質量部に対して0.10質量部~2質量部であるのが特に好ましい。
本発明において、前記光拡散板(3)は、プロピレン樹脂100質量部に対して、前記第1、第2および第3からなる群より選ばれる1種以上の光安定剤を0.03質量部~10質量部、前記第1および第2紫外線吸収剤からなる群より選ばれる1種以上の紫外線吸収剤を0.03質量部~10質量部含有する樹脂組成物からなるのが好ましい。この場合には、前記ヒンダードアミン系光安定剤(HALS)に加えて、さらに特定の紫外線吸収剤を特定量含有するので、ブリードアウトを抑制しつつ、変色防止効果をさらに高めることができる。なお、前記特定の光安定剤の含有量は、プロピレン樹脂100質量部に対して0.05質量部~5質量部であるのが好ましく、更にはプロピレン樹脂100質量部に対して0.10質量部~2質量部であるのが特に好ましい。また、前記特定の紫外線吸収剤の含有量は、プロピレン樹脂100質量部に対して0.05質量部~5質量部であるのが好ましく、更にはプロピレン樹脂100質量部に対して0.10質量部~2質量部であるのが特に好ましい。また、前記特定の紫外線吸収剤としては、前記一般式(III)で表される第1紫外線吸収剤(1種であってもよいし2種以上であってもよい)を用いるのが好ましく、この場合には、前記第2紫外線吸収剤を用いた場合と比較して、優れた変色防止効果をより長期間にわたって維持できる。
或いは、前記光拡散板(3)は、プロピレン樹脂100質量部に対して前記第1、第2および第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤を0.03質量部~10質量部含有する樹脂組成物からなり、該樹脂組成物は紫外線吸収剤(UVA)を含有しないものであるのが好ましい。この場合には、ブリードアウトがより抑制される。この紫外線吸収剤(UVA)を含有せしめない構成においても、プロピレン樹脂100質量部に対して前記特定の光安定剤を0.05質量部~5質量部含有せしめるのが好ましく、更にはプロピレン樹脂100質量部に対して前記特定の光安定剤を0.10質量部~2質量部含有せしめるのが特に好ましい。
前記一般式(I)で表される第1ヒンダードアミン系光安定剤としては、特に限定されるものではないが、例えば、チヌビン622LD(チバ・ジャパン社製)等が挙げられる。前記チヌビン622LDは、式(I)において、R11が水素原子、R12がメチル基である。
前記一般式(II)で表される第2ヒンダードアミン系光安定剤としては、特に限定されるものではないが、例えば、キマソーブ119FL(チバ・ジャパン社製)等が挙げられる。なお、前記キマソーブ119FLは、式(II)で表される第2ヒンダードアミン系光安定剤90質量%と、式(I)においてR11が水素原子、R12がメチル基である第1ヒンダードアミン系光安定剤10質量%との混合物である。
なお、実施例で用いた、チヌビンXT850FF(チバ・ジャパン社製)、チヌビンXT855FF(チバ・ジャパン社製)は、式(I)で表される第1ヒンダードアミン系光安定剤および式(XI)で表される第3ヒンダードアミン系光安定剤からなる群より選ばれる少なくとも1種の光安定剤である。
前記一般式(III)で表される第1紫外線吸収剤としては、特に限定されるものではないが、例えば、チヌビン234(チバ・ジャパン社製)、チヌビン328(チバ・ジャパン社製)、SEESORB703(シプロ化成社製)、SEESORB707(シプロ化成社製)等が挙げられる。
前記チヌビン234は、式(III)において、R31が式(VII)で表される置換基、R32が水素原子、R33が式(VII)で表される置換基、Xが水素原子である。
前記チヌビン328は、式(III)において、R31がtert−オクチル基、R32が水素原子、R33がtert−オクチル基、Xが水素原子である。
前記SEESORB703は、式(III)において、R31がtert−ブチル基、R32が水素原子、R33がメチル基、Xが塩素原子である。
前記SEESORB707は、式(III)において、R31が水素原子、R32が−O(CH2)7CH3基、R33が水素原子、Xが水素原子である。
前記式(IV)で表される第2紫外線吸収剤としては、特に限定されるものではないが、例えば、SEESORB501(シプロ化成社製)、SEESORB502(シプロ化成社製)、PR25(クラリアント社製)、B−CAP(クラリアント社製)等が挙げられる。
前記SEESORB501は、式(IV)において、R41がフェニル基、R42がフェニル基、R43がシアノ基、R44が−COOC2H5基である。
前記SEESORB502は、式(IV)において、R41がフェニル基、R42がフェニル基、R43がシアノ基、R44が式(IX)で表される置換基である。
前記PR25は、式(IV)において、R41が−COOCH3基、R42が−COOCH3基、R43が式(VIII)で表される置換基、R44が水素原子である。
前記B−CAPは、式(IV)において、R41が式(X)で表される置換基、R42が水素原子、R43、R44、R105、R106はいずれも−COOC2H5基である。
前記プロピレン樹脂としては、プロピレンを単独で重合させて得られるホモポリプロピレンであってもよいし、プロピレンおよびこれと共重合し得る共重合成分の共重合体であってもよい。十分な剛性が得られる点で、前記プロピレン樹脂中のプロピレン単位の含有率は75質量%以上であるのが好ましい。前記共重合成分としては、特に限定されるものではないが、例えばエチレン、1−ブテン等のα−オレフィンなどが挙げられる。
前記プロピレン樹脂としては、プロピレン単位含有率75~100質量%、エチレン単位含有率0~15質量%、および1−ブテン単位含有率0~25質量%からなるものが好ましい。また、前記プロピレン樹脂としては、プロピレン単位含有率95~100質量%、エチレン単位含有率0~5質量%、および1−ブテン単位含有率0~5質量%からなるものがより好ましい。更には、前記プロピレン樹脂としては、プロピレン単位含有率99~100質量%、エチレン単位含有率0~1質量%、および1−ブテン単位含有率0~1質量%からなるもの(ホモポリプロピレンを含む)が最も好ましい。
前記光拡散板(3)を構成するプロピレン樹脂に、さらに光拡散粒子および/または造核剤が配合されるのが好ましい。
前記光拡散粒子(光拡散剤)としては、前記プロピレン樹脂と屈折率が異なる粒子であって、該粒子を含有する光拡散板を透過する光を拡散し得るものであれば、特に限定されない。例えば、ガラス粒子、ガラス繊維、シリカ粒子、水酸化アルミニウム粒子、炭酸カルシウム粒子、硫酸バリウム粒子、酸化チタン粒子、タルク等の無機粒子であってもよいし、スチレン系重合体粒子、アクリル系重合体粒子、シロキサン系重合体粒子等の有機粒子であってもよい。
前記光拡散粒子としては、通常、その体積平均粒子径が0.5μm~25μmの範囲にあるものが用いられる。中でも、体積平均粒子径の好ましい下限値は0.7μmであり、また体積平均粒子径の好ましい上限値は20μmであり、特に好ましい上限値は10μmである。なお、体積平均粒子径(D50)は、全粒子の粒子径および体積を測定し、小さい粒子径のものから順次体積を積算し、該積算体積が全粒子の合計体積に対して50%となる粒子の粒子径である。
前記光拡散板(3)における光拡散粒子の含有量は、前記プロピレン樹脂100質量部に対して0.01質量部~20質量部の範囲に設定されるのが好ましい。該含有量が0.01質量部以上であることで光拡散効果が十分に得られるものとなると共に、20質量部以下であることで十分な機械的強度を確保できる。
また、前記造核剤としては、特に限定されるものではないが、例えば、ソルビトール系造核剤、有機リン酸塩系造核剤、カルボン酸の金属塩造核剤、ロジン系造核剤等を使用できる。
前記光拡散板(3)における造核剤の含有量は、前記プロピレン樹脂100質量部に対して0.01質量部~1.0質量部の範囲が好ましい。0.01質量部以上であることで表面に白点等の出現が抑制され、外観の良好な光拡散板を得ることができると共に、1.0質量部以下であることで造核剤の分散不良による光学特性の低下およびコスト増大を抑制できる。
前記光拡散板(3)を構成する樹脂組成物に、必要に応じて、熱安定剤、酸化防止剤、耐候剤、蛍光増白剤、加工安定剤等の添加剤を含有せしめてもよい。
また、前記光拡散板(3)の大きさは、特に限定されるものではなく、例えば目的とする面光源装置(1)や液晶表示装置(30)の大きさに応じて適宜設定されるものであるが、中でも、20型(縦30cm、横40cm)以上の大きさに設計される光拡散板として特に好適である。
なお、前記光拡散板(3)の厚さは、通常0.1mm~3mm、好ましくは0.5mm~3mmの範囲に設定される。
本発明の光拡散板(3)は、例えば次のようにして製造できる。前記組成からなる樹脂組成物を、押出成形する押出成形法、射出成形する射出成形法、熱プレスする熱プレス法等の公知の成形法によって製造できる。前記製造方法は、その例を示したものに過ぎず、本発明の光拡散板(3)は、このような製造方法で製造されたものに限定されるものではない。
前記光拡散板(3)は、図1に示すように両面が平坦面であってもよいし、少なくとも片面が、レンチキュラーレンズ、フレネルレンズ、プリズムレンズ等の凹凸が形成された面であってもよいし、少なくとも片面が艶消し面であってもよい。
前記艶消し面とする場合には、その表面の十点平均粗さ(Rz)は1μm~100μmに設定されるのが好ましく、これにより光拡散板(3)の当該表面(艶消し面)の傷付き発生を十分に抑制することができる。
図2に、本発明の光拡散板(3)の表面(片面または両面)(6b)に形成される凹凸形状の一例を示す。図2では、断面形状が三角形凸部(V字溝)の凹凸形状が採用されている。この図2の例では、隣り合う三角形凸部(71)が間隔をあけることなく連続状に形成されている(換言すれば、隣り合うV字溝(72)が連続状に形成されている)が、特にこのような構成に限定されるものではなく、隣り合う三角形凸部が間隔(d1)をあけた非連続状に構成されていてもよい。前記三角形凸部(71)のピッチ間隔(P1)は30μm~500μmの範囲であるのが好ましい。また、前記三角形凸部(71)の高さ(H1)は30μm~500μmの範囲であるのが好ましい。前記隣り合う三角形凸部(71)の離間間隔(d1:図示せず)は1μm~10μmの範囲であるのが好ましい。また、前記三角形凸部(71)の頂部の頂角(θ)は10~100°であるのが好ましく、中でも10~90°であるのがより好ましい。
図3に、光拡散板(3)の表面(片面または両面)(6b)に形成される凹凸形状の他の例を示す。図3では、断面形状が略半円形状である略半円凸部(81)を含む凹凸形状が採用されている。この図3の例では、隣り合う略半円凸部(81)が間隔(d2)をあけて非連続状に形成されているが、特にこのような構成に限定されるものではなく、隣り合う略半円凸部(81)が間隔をあけることなく連続状に(即ちd2=0)構成されていてもよい。前記略半円凸部(81)のピッチ間隔(P2)は30μm~500μmの範囲であるのが好ましい。また、前記略半円凸部(81)の高さ(H2)は30μm~500μmの範囲であるのが好ましい。また、前記隣り合う略半円凸部(81)の離間間隔(d2)は1μm~10μmの範囲であるのが好ましい。なお、前記略半円凸部(81)とは、図3に示すような断面形状が半円形状であるものを含む他、例えば図4に示すシリンドリカルレンズ(82)のように、円柱体をその中心軸線に平行であって、該中心軸線を含まない平面で切断した場合の断面のいずれかの弧状である形状であってもよいし、或いは断面が半楕円弧状や、該半楕円弧状の一部である扁平湾曲状等の形状であってもよい。
また、前記光拡散板(3)の表面(片面または両面)(6b)に形成される凹凸形状としては、上記略半円凸部が反転した略半円凹溝を備えた形状であってもよい。前記略半円凹溝とは、断面形状が半円形状であるものを含む他、例えばシリンドリカルレンズのように、円柱体をその中心軸線に平行であって、該中心軸線を含まない平面で切断した場合の断面のいずれかの弧状である形状であってもよいし、或いは断面が半楕円弧状や、該半楕円弧状の一部である扁平湾曲状等の形状であってもよい。
図5に、光拡散板(3)の表面(片面または両面)(6b)に形成される凹凸形状のさらに他の例を示す。図5では、断面形状が略三角形形状である略三角形凸部(91)を含む凹凸形状が採用されている。前記略三角形凸部(91)の断面形状における左右の斜辺は、いずれも先端側が直線であり、基端側(底辺側)が曲線(中央部で側方に向けて膨らむ曲線)である。即ち、前記略三角形凸部(91)の左右の斜面は、先端側の直線部(92)と、基端側の曲線部(93)とからなる。この図5の例では、隣り合う略三角形凸部(91)が間隔(d3)をあけて非連続状に形成されているが、特にこのような構成に限定されるものではなく、隣り合う略三角形凸部(91)が間隔をあけることなく連続状に(即ちd3=0)構成されていてもよい。前記略三角形凸部(91)のピッチ間隔(P3)は30μm~500μmの範囲であるのが好ましい。また、前記略三角形凸部(91)の高さ(H3)は30μm~500μmの範囲であるのが好ましい。また、前記隣り合う略三角形凸部(91)の離間間隔(d3)は1μm~10μmの範囲であるのが好ましい。前記略三角形凸部(91)の頂角(α)は10°~100°であるのが好ましく、中でも10°~90°であるのがより好ましい。前記曲線部(93)の曲線は、例えば、円弧状の一部、楕円弧状の一部であってもよい。前記円弧状の一部としては、例えばシリンドリカルレンズのように、円柱体をその中心軸線に平行であって、該中心軸線を含まない平面で切断した場合の断面のいずれかの弧状である形状等が挙げられる。なお、上記実施形態(図5、図6)では、前記略三角形凸部(91)としては、先端側の直線部(92)に基端側の曲線部(93)が連接されてなる斜面を備えた構成が採用されているが、特にこのような構成に限定されるものではなく、例えば図7に示すように、直線部を有さずに曲線部(93)のみからなる斜面を備えた構成を採用してもよい。
前記凹凸形状の凸部のピッチ間隔(P1)(P2)(P3)は、光拡散板(3)の全体にわたって必ずしも一定である必要はなく、部分的に又は全体にわたって隣り合う凸部(71)(81)(91)間で異なっていてもよい。また、前記凹凸形状の凸部の高さ(H1)(H2)(H3)も、光拡散板(3)の全体にわたって必ずしも一定である必要はなく、部分的に又は全体にわたって隣り合う凸部(71)(81)(91)間で異なっていてもよい。前記凹凸形状の頂角(θ)(α)及び間隔(d1)(d2)(d3)についても同様に、光拡散板(3)の全体にわたって必ずしも一定である必要はなく、部分的に又は全体にわたって隣り合う凸部(71)(81)(91)間で異なっていてもよい。
また、前記光拡散板(3)の表面に凹凸を形成させる方法としては、例えば光拡散板を押出成形により製造する場合であれば、表面側になる層を構成する樹脂に不溶の樹脂粒子を含有せしめて押出成形する方法、押出直後に凹凸形状が表面に付与された転写ロールを接触せしめて凹凸を押出板(光拡散板)の表面に転写する方法等が挙げられる。また、光拡散板を射出成形や熱プレスにより製造する場合であれば、成形面に凹凸形状が付与された金型を用いて凹凸を転写する方法等が挙げられる。
本発明に係る光拡散板(3)、面光源装置(1)および液晶表示装置(30)は、上記実施形態のものに特に限定されるものではなく、請求の範囲内であれば、その精神を逸脱するものでない限りいかなる設計的変更をも許容するものである。 An embodiment of a liquid crystal display device according to the present invention is shown in FIG. In FIG. 1, (30) is a liquid crystal display device, (11) is a liquid crystal cell, (12) and (13) are polarizing plates, and (1) is a surface light source device (backlight). Polarizing plates (12) and (13) are respectively arranged on the upper and lower sides of the liquid crystal cell (11), and a liquid crystal panel (20) as an image display unit is constituted by these constituent members (11), (12) and (13). Yes. In addition, as the liquid crystal cell (11), those capable of displaying a color image are preferably used.
The said surface light source device (1) is arrange | positioned at the lower surface side (back side) of the polarizing plate (13) below the said liquid crystal panel (20). That is, this liquid crystal display device (30) is a direct liquid crystal display device.
The surface light source device (1) is a thin box-shaped lamp box (5) having a rectangular shape in plan view and having an upper surface side (front surface side) opened, and the lamp box (5) spaced apart from each other. And a light diffusion plate (3) disposed on the upper side (front side) of the plurality of light sources (2). The said light diffusing plate (3) is mounted and fixed with respect to the said lamp box (5) so that the open surface may be block | closed. A light reflecting layer (not shown) is provided on the inner surface of the lamp box (5). Although it does not specifically limit as said light source (2), For example, in addition to linear light sources, such as a cold-cathode tube, a hot cathode tube, and EEFL (external electrode fluorescent lamp), dot-like, such as light emitting diodes (LED) A light source or the like is used.
The light diffusion plate (3) includes 100 parts by mass of a propylene resin, a first hindered amine light stabilizer represented by the formula (I), a second hindered amine light stabilizer represented by the formula (II), and the It consists of a resin composition containing 0.03 to 10 parts by mass of one or more light stabilizers (HALS) selected from the group consisting of third hindered amine light stabilizers represented by the formula (XI). The light stabilizer may be one selected from the group consisting of the first, second and third hindered amine light stabilizers, or two or more selected from the group.
Since the light diffusion plate (3) according to the above configuration uses propylene resin as a constituent resin, it is lightweight, excellent in mechanical strength and hard to break, and excellent in heat resistance and moisture resistance due to heat and moisture. Difficult to deform. A resin containing 0.03 to 10 parts by mass of one or more light stabilizers selected from the group consisting of the first, second and third hindered amine light stabilizers with respect to 100 parts by mass of propylene resin Since it consists of a composition, discoloration is prevented in a certain environment, such as light from a light source and heat, and bleed-out is also suppressed. Therefore, the surface light source device (1) has excellent durability and high quality. The content of the specific light stabilizer is preferably 0.05 to 5 parts by mass with respect to 100 parts by mass of the propylene resin, and further 0.10 parts by mass with respect to 100 parts by mass of the propylene resin. It is particularly preferably 2 to 2 parts by mass.
In this invention, the said light diffusing plate (3) is 0.03 mass part of 1 or more types of light stabilizers chosen from the group which consists of said 1st, 2nd and 3 with respect to 100 mass parts of propylene resin. It is preferably composed of a resin composition containing 0.03 parts by mass to 10 parts by mass of one or more kinds of ultraviolet absorbers selected from the group consisting of 10 parts by mass and the first and second ultraviolet absorbers. In this case, in addition to the hindered amine light stabilizer (HALS), a specific ultraviolet absorber is contained in a specific amount, so that the effect of preventing discoloration can be further enhanced while suppressing bleed out. The content of the specific light stabilizer is preferably 0.05 to 5 parts by mass with respect to 100 parts by mass of the propylene resin, and further 0.10 parts by mass with respect to 100 parts by mass of the propylene resin. It is particularly preferably 2 to 2 parts by mass. Further, the content of the specific ultraviolet absorber is preferably 0.05 parts by mass to 5 parts by mass with respect to 100 parts by mass of the propylene resin, and further 0.10 parts by mass with respect to 100 parts by mass of the propylene resin. It is particularly preferably 2 to 2 parts by mass. Moreover, as the specific ultraviolet absorber, it is preferable to use a first ultraviolet absorber represented by the general formula (III) (one kind or two or more kinds) may be used. In this case, compared with the case where the said 2nd ultraviolet absorber is used, the outstanding discoloration prevention effect can be maintained over a long period of time.
Alternatively, the light diffusing plate (3) contains 0.03 of one or more light stabilizers selected from the group consisting of the first, second, and third hindered amine light stabilizers with respect to 100 parts by mass of the propylene resin. The resin composition is preferably contained in an amount of 10 to 10 parts by mass, and the resin composition preferably contains no ultraviolet absorber (UVA). In this case, bleed out is further suppressed. Even in a configuration in which this ultraviolet absorber (UVA) is not contained, it is preferable to contain 0.05 to 5 parts by mass of the specific light stabilizer with respect to 100 parts by mass of the propylene resin. It is particularly preferable to contain 0.10 to 2 parts by mass of the specific light stabilizer with respect to parts by mass.
Although it does not specifically limit as a 1st hindered amine light stabilizer represented by the said general formula (I), For example, Tinuvin 622LD (made by Ciba Japan) etc. are mentioned. Tinuvin 622LD has the formula (I), wherein R 11 is a hydrogen atom and R 12 is a methyl group.
Although it does not specifically limit as a 2nd hindered amine light stabilizer represented by the said general formula (II), For example, Kimasorb 119FL (made by Ciba Japan) etc. are mentioned. The Kimasorb 119FL includes 90% by mass of a second hindered amine light stabilizer represented by the formula (II), and a first hindered amine light in which R 11 is a hydrogen atom and R 12 is a methyl group in the formula (I). It is a mixture with 10% by weight of stabilizer.
In addition, used in the examples, Tinuvin XT850FF (manufactured by Ciba Japan) and Tinuvin XT855FF (manufactured by Ciba Japan) are the first hindered amine light stabilizer represented by formula (I) and formula (XI). It is at least one light stabilizer selected from the group consisting of the third hindered amine light stabilizers represented.
Although it does not specifically limit as a 1st ultraviolet absorber represented by the said general formula (III), For example, Tinuvin 234 (made by Ciba Japan), Tinuvin 328 (made by Ciba Japan), SEESORB703 (Manufactured by Sipro Kasei Co., Ltd.), SEESORB 707 (manufactured by Sipro Kasei Co., Ltd.) and the like.
In the formula (III), the tinuvin 234 is a substituent in which R 31 is represented by the formula (VII), R 32 is a hydrogen atom, R 33 is a substituent represented by the formula (VII), and X is a hydrogen atom. is there.
In the tinuvin 328, in formula (III), R 31 is a tert-octyl group, R 32 is a hydrogen atom, R 33 is a tert-octyl group, and X is a hydrogen atom.
In the SEESORB 703, in the formula (III), R 31 is a tert-butyl group, R 32 is a hydrogen atom, R 33 is a methyl group, and X is a chlorine atom.
The SEESORB707, in Formula (III), R 31 is a hydrogen atom, R 32 is -O (CH 2) 7 CH 3 group, R 33 is a hydrogen atom, X is a hydrogen atom.
Although it does not specifically limit as a 2nd ultraviolet absorber represented by the said formula (IV), For example, SEESORB501 (made by Sipro Kasei), SEESORB502 (made by Sipro Kasei), PR25 (made by Clariant) , B-CAP (manufactured by Clariant) and the like.
The SEESORB501, in Formula (IV), R 41 is a phenyl group, R 42 is a phenyl group, R 43 is a cyano group, R 44 is -COOC 2 H 5 group.
The SEESORB 502 is a substituent represented by the formula (IV), wherein R 41 is a phenyl group, R 42 is a phenyl group, R 43 is a cyano group, and R 44 is a formula (IX).
The PR25, in Formula (IV), 3 groups R 41 is -COOCH, R 42 is -COOCH 3 group, the substituents R 43 is represented by formula (VIII), is R 44 is hydrogen atom.
In the formula (IV), R 41 is a substituent represented by the formula (X), R 42 is a hydrogen atom, R 43 , R 44 , R 105 , and R 106 are all —COOC 2 H in the formula (IV). Five groups.
The propylene resin may be a homopolypropylene obtained by polymerizing propylene alone, or may be a copolymer of propylene and a copolymerizable component that can be copolymerized therewith. The content of propylene units in the propylene resin is preferably 75% by mass or more in that sufficient rigidity is obtained. The copolymer component is not particularly limited, and examples thereof include α-olefins such as ethylene and 1-butene.
The propylene resin preferably has a propylene unit content of 75 to 100% by mass, an ethylene unit content of 0 to 15% by mass, and a 1-butene unit content of 0 to 25% by mass. The propylene resin is more preferably composed of a propylene unit content of 95 to 100% by mass, an ethylene unit content of 0 to 5% by mass, and a 1-butene unit content of 0 to 5% by mass. Further, the propylene resin includes a propylene unit content of 99 to 100% by mass, an ethylene unit content of 0 to 1% by mass, and a 1-butene unit content of 0 to 1% by mass (including homopolypropylene). Is most preferred.
It is preferable that light diffusing particles and / or nucleating agents are further blended with the propylene resin constituting the light diffusing plate (3).
The light diffusing particle (light diffusing agent) is not particularly limited as long as it is a particle having a refractive index different from that of the propylene resin and can diffuse light transmitted through a light diffusing plate containing the particle. For example, it may be inorganic particles such as glass particles, glass fibers, silica particles, aluminum hydroxide particles, calcium carbonate particles, barium sulfate particles, titanium oxide particles, talc, styrene polymer particles, acrylic polymers. Organic particles such as particles and siloxane polymer particles may be used.
As the light diffusing particles, those having a volume average particle diameter in the range of 0.5 μm to 25 μm are usually used. Among these, a preferable lower limit value of the volume average particle diameter is 0.7 μm, and a preferable upper limit value of the volume average particle diameter is 20 μm, and a particularly preferable upper limit value is 10 μm. The volume average particle diameter (D 50 ) is determined by measuring the particle diameter and volume of all the particles, and sequentially integrating the volumes from the smallest particle diameter, and the integrated volume is 50% with respect to the total volume of all the particles. The particle diameter of the resulting particles.
The content of the light diffusing particles in the light diffusing plate (3) is preferably set in the range of 0.01 to 20 parts by mass with respect to 100 parts by mass of the propylene resin. When the content is 0.01 parts by mass or more, the light diffusion effect can be sufficiently obtained, and when the content is 20 parts by mass or less, sufficient mechanical strength can be secured.
Further, the nucleating agent is not particularly limited. For example, sorbitol nucleating agent, organophosphate nucleating agent, metal salt nucleating agent of carboxylic acid, rosin nucleating agent, etc. Can be used.
The content of the nucleating agent in the light diffusing plate (3) is preferably in the range of 0.01 to 1.0 part by mass with respect to 100 parts by mass of the propylene resin. Appearance of white spots or the like on the surface is suppressed by being 0.01 parts by mass or more, and a light diffusing plate having a good appearance can be obtained, and dispersion of the nucleating agent is 1.0 parts by mass or less. It is possible to suppress a decrease in optical characteristics and an increase in cost due to defects.
You may make the resin composition which comprises the said light diffusing plate (3) contain additives, such as a heat stabilizer, antioxidant, a weathering agent, a fluorescent whitening agent, and a processing stabilizer, as needed.
The size of the light diffusing plate (3) is not particularly limited, and is appropriately set according to the size of the target surface light source device (1) or liquid crystal display device (30), for example. However, among them, it is particularly suitable as a light diffusing plate designed to have a size of 20 type (
The thickness of the light diffusing plate (3) is usually set in the range of 0.1 mm to 3 mm, preferably 0.5 mm to 3 mm.
The light diffusing plate (3) of this invention can be manufactured as follows, for example. The resin composition having the above composition can be produced by a known molding method such as an extrusion molding method for extrusion molding, an injection molding method for injection molding, or a hot pressing method for hot pressing. The said manufacturing method is only what showed the example, and the light diffusing plate (3) of this invention is not limited to what was manufactured with such a manufacturing method.
The light diffusing plate (3) may be flat on both sides as shown in FIG. 1, or at least one side may be a surface on which irregularities such as a lenticular lens, a Fresnel lens, and a prism lens are formed. Alternatively, at least one surface may be a matte surface.
In the case of using the matte surface, the ten-point average roughness (Rz) of the surface is preferably set to 1 μm to 100 μm, and thereby the surface (matte surface) of the light diffusion plate (3) is set. The occurrence of scratches can be sufficiently suppressed.
In FIG. 2, an example of the uneven | corrugated shape formed in the surface (one side or both surfaces) (6b) of the light diffusing plate (3) of this invention is shown. In FIG. 2, a concavo-convex shape in which the cross-sectional shape is a triangular convex portion (V-shaped groove) is adopted. In the example of FIG. 2, adjacent triangular convex portions (71) are formed in a continuous manner without any interval (in other words, adjacent V-shaped grooves (72) are formed in a continuous shape). However, the configuration is not particularly limited to such a configuration, and adjacent triangular convex portions may be configured to be discontinuous with an interval (d 1 ). The pitch interval (P 1 ) of the triangular protrusions (71) is preferably in the range of 30 μm to 500 μm. The height (H 1 ) of the triangular convex portion (71) is preferably in the range of 30 μm to 500 μm. The spacing distance (d 1 : not shown) between the adjacent triangular protrusions (71) is preferably in the range of 1 μm to 10 μm. Further, the apex angle (θ) of the apex of the triangular convex portion (71) is preferably 10 to 100 °, and more preferably 10 to 90 °.
FIG. 3 shows another example of the uneven shape formed on the surface (one side or both sides) (6b) of the light diffusion plate (3). In FIG. 3, an uneven shape including a substantially semicircular convex portion (81) having a substantially semicircular cross-sectional shape is employed. In the example of FIG. 3, adjacent semi-circular protrusions (81) are formed in a discontinuous manner with an interval (d 2 ), but are not particularly limited to such a configuration. The matching semi-circular convex portions (81) may be formed continuously (that is, d 2 = 0) without any interval. The pitch interval (P 2 ) of the substantially semicircular protrusions (81) is preferably in the range of 30 μm to 500 μm. The height (H 2 ) of the substantially semicircular protrusion (81) is preferably in the range of 30 μm to 500 μm. In addition, the spacing (d 2 ) between the adjacent substantially semicircular convex portions (81) is preferably in the range of 1 μm to 10 μm. Note that the substantially semicircular convex portion (81) includes not only those having a semicircular cross-sectional shape as shown in FIG. 3, but also a cylindrical body such as a cylindrical lens (82) shown in FIG. It may be in the shape of any arc of the cross section when cut by a plane that is parallel to the central axis and does not include the central axis. Alternatively, the cross section may be a semi-elliptical arc or a semi-elliptical arc. It may be a part of a flat curved shape or the like.
Further, the uneven shape formed on the surface (one side or both sides) (6b) of the light diffusing plate (3) may be a shape provided with a substantially semicircular concave groove in which the substantially semicircular convex portion is inverted. Good. The substantially semi-circular groove includes those having a semicircular cross-sectional shape, and also, for example, a cylindrical body, such as a cylindrical lens, cut along a plane that is parallel to the central axis and does not include the central axis. In this case, the cross section may have any arc shape, or the cross section may have a semi-elliptical arc shape, a flat curved shape that is a part of the semi-elliptical arc shape, or the like.
In FIG. 5, the further another example of the uneven | corrugated shape formed in the surface (one side or both sides) (6b) of a light diffusing plate (3) is shown. In FIG. 5, the uneven | corrugated shape containing the substantially triangular convex part (91) whose cross-sectional shape is a substantially triangular shape is employ | adopted. The left and right hypotenuses in the cross-sectional shape of the substantially triangular convex portion (91) are both straight at the tip side and curved at the base end side (bottom side) (curved bulging sideways at the center). That is, the left and right slopes of the substantially triangular convex portion (91) are composed of a straight portion (92) on the distal end side and a curved portion (93) on the proximal end side. In the example of FIG. 5, the adjacent substantially triangular protrusions (91) are formed in a discontinuous manner with an interval (d 3 ), but are not particularly limited to such a configuration and are adjacent to each other. The substantially triangular convex portions (91) may be configured continuously (i.e., d 3 = 0) without any interval. The pitch interval (P 3 ) of the substantially triangular convex portions (91) is preferably in the range of 30 μm to 500 μm. The height (H 3 ) of the substantially triangular convex portion (91) is preferably in the range of 30 μm to 500 μm. Further, it is preferable that the spacing (d 3 ) between the adjacent substantially triangular convex portions (91) is in the range of 1 μm to 10 μm. The apex angle (α) of the substantially triangular convex portion (91) is preferably 10 ° to 100 °, and more preferably 10 ° to 90 °. The curve of the curved portion (93) may be, for example, an arc-shaped part or an elliptical arc-shaped part. As the arc-shaped part, for example, a cylindrical lens having a circular arc shape in a cross section when the cylindrical body is cut by a plane that is parallel to the central axis and does not include the central axis, etc. Is mentioned. In the above-described embodiment (FIGS. 5 and 6), the substantially triangular convex portion (91) is a slope formed by connecting the proximal-side curved portion (93) to the distal-side straight portion (92). However, the present invention is not particularly limited to such a configuration. For example, as shown in FIG. 7, a slope having only a curved portion (93) without a straight portion is provided. A configuration may be adopted.
The pitch interval (P 1 ) (P 2 ) (P 3 ) of the concavo-convex convex portions does not necessarily have to be constant over the entire light diffusing plate (3), and the convex portions adjacent to each other partially or entirely. (71) (81) (91) may be different. Further, the height (H 1 ) (H 2 ) (H 3 ) of the concavo-convex convex portions does not necessarily have to be constant over the entire light diffusion plate (3), and is partially or entirely adjacent. You may differ between convex parts (71) (81) (91). Similarly, the apex angle (θ) (α) and the interval (d 1 ) (d 2 ) (d 3 ) of the concavo-convex shape do not necessarily have to be constant throughout the light diffusion plate (3). Alternatively, the protrusions (71) (81) (91) which are adjacent to each other may be different.
Moreover, as a method of forming irregularities on the surface of the light diffusing plate (3), for example, if the light diffusing plate is produced by extrusion molding, resin particles insoluble in the resin constituting the surface side layer are used. Examples thereof include a method of containing and extrusion molding, a method of transferring a concavo-convex to the surface of an extruded plate (light diffusion plate) by bringing a transfer roll having a concavo-convex shape on the surface thereof into contact immediately after extrusion. Moreover, when manufacturing a light-diffusion board by injection molding or a hot press, the method etc. which transfer an unevenness | corrugation using the metal mold | die with which the uneven | corrugated shape was provided to the molding surface are mentioned.
The light diffusing plate (3), the surface light source device (1) and the liquid crystal display device (30) according to the present invention are not particularly limited to those of the above-described embodiment, and the spirit thereof is within the scope of the claims. Any design changes are allowed as long as they do not deviate from.
次に、本発明の具体的実施例について説明するが、本発明はこれら実施例のものに特に限定されるものではない。
<実施例1>
プロピレン樹脂(住友化学社製「FSX20L8」)99.1質量部、チヌビンXT850FF(チバ・ジャパン社製)0.5質量部、スミライザーGP(住友化学社製、熱安定剤)0.2質量部、アデカスタブNA11(ADEKA社製、リン酸エステル系造核剤)0.2質量部をドライブレンドした後、スクリュー径40mmの押出機に供給して210~250℃で溶融混練し、マルチマニホールドダイを経由してダイ温度250~260℃で押出すことによって、光拡散板(厚さ1.5mm、幅250mm)を得た。
<実施例2~9、比較例1~5>
表1~3に示す材料を表1~3に示す割合でそれぞれ用いた以外は、実施例1と同様にして光拡散板を得た。
なお、表中に記載の「LA31」は、ADEKA社製の紫外線吸収剤であり、「イルガフォス168」は、チバ・ジャパン社製の熱安定剤である。
上記のようにして得られた各光拡散板について下記評価法に従い評価を行った。評価結果を表1~3に示す。
<耐久性評価法>
各光拡散板について下記の水銀灯照射試験、高温高湿試験、高温試験、低温試験を行い、試験後の光拡散板の表面状態を目視観察し、表面に粉が付着しているもの(即ちブリードアウトしているもの)を「×」とし、表面に粉の付着がなく試験前の初期状態と同様の良好な表面状態であるもの(即ちブリードアウトがないもの)を「○」とした。また、下記YI測定法により上記試験前の光拡散板の黄色度YIを測定し、これを「初期YI」とし、上記試験後の光拡散板の黄色度YIを測定し、これを「試験後YI」とし、変化量ΔYIを下記算出式により求めた。
ΔYI=(試験後YI)−(初期YI)
(250時間水銀灯照射試験)
75℃条件下において光拡散板に対して水銀灯照射を250時間行った。
(250時間高温高湿試験)
60℃90%RHの高温高湿条件下に光拡散板を250時間配置した。
(250時間高温試験)
80℃の高温条件下に光拡散板を250時間配置した。
(250時間低温試験)
−40℃の低温条件下に光拡散板を250時間配置した。
(500時間水銀灯照射試験)
75℃条件下において光拡散板に対して水銀灯照射を500時間行った。
(500時間高温高湿試験)
60℃90%RHの高温高湿条件下に光拡散板を500時間配置した。
(500時間高温試験)
80℃の高温条件下に光拡散板を500時間配置した。
(500時間低温試験)
−40℃の低温条件下に光拡散板を500時間配置した。
[黄色度YI測定法]
積分球を備えた自記分光光度計(日立製作所製「UV−4000」)を用いて光拡散板の380~780nmの波長範囲の分光透過率を測定し、これに基づいて黄色度YIを算出した。
表1~3から明らかなように、本発明の実施例1~9の光拡散板は、水銀灯照射試験、高温高湿試験、高温試験、低温試験を500時間行っても、変色が十分に抑制されていると共に、ブリードアウトも生じなかった。
実施例1、2の光拡散板は、プロピレン樹脂100質量部に対するヒンダードアミン系光安定剤の添加量が0.1質量部~2.0質量部の範囲という少ない添加量であり、実施例3~5の光拡散板は、プロピレン樹脂100質量部に対するヒンダードアミン系光安定剤および紫外線吸収剤の添加量がいずれも0.1質量部~2.0質量部の範囲という少ない添加量であり、これら実施例1~5の光拡散板は、このように少ない添加量でありながら(低コストでありながら)、ΔYIが5より小さくて変色が十分に抑制されていると共に、水銀灯照射試験、高温高湿試験、高温試験、低温試験を500時間行ってもブリードアウトを生じないので、特に好適である。
これに対し、本発明の規定範囲を逸脱する比較例1~5では、水銀灯照射試験、高温高湿試験、高温試験、低温試験を行うと、250時間でブリードアウトを生じた。 Next, specific examples of the present invention will be described, but the present invention is not particularly limited to these examples.
<Example 1>
99.1 parts by mass of propylene resin ("FSX20L8" manufactured by Sumitomo Chemical Co., Ltd.), 0.5 parts by mass of Tinuvin XT850FF (Ciba Japan Co., Ltd.), 0.2 parts by mass of Sumizer GP (manufactured by Sumitomo Chemical Co., Ltd., thermal stabilizer), After dry blending 0.2 part by weight of ADK STAB NA11 (manufactured by ADEKA, phosphate ester nucleating agent), it is supplied to an extruder with a screw diameter of 40 mm and melt-kneaded at 210-250 ° C., via a multi-manifold die Then, a light diffusion plate (thickness 1.5 mm, width 250 mm) was obtained by extrusion at a die temperature of 250 to 260 ° C.
<Examples 2 to 9, Comparative Examples 1 to 5>
A light diffusing plate was obtained in the same manner as in Example 1 except that the materials shown in Tables 1 to 3 were used in the ratios shown in Tables 1 to 3, respectively.
In the table, “LA31” is an ultraviolet absorber made by ADEKA, and “Irgaphos 168” is a heat stabilizer made by Ciba Japan.
Each light diffusion plate obtained as described above was evaluated according to the following evaluation method. The evaluation results are shown in Tables 1 to 3.
<Durability evaluation method>
Each light diffusion plate is subjected to the following mercury lamp irradiation test, high-temperature and high-humidity test, high-temperature test, and low-temperature test, the surface state of the light diffusion plate after the test is visually observed, and powder is adhered to the surface (that is, bleeding) "No"), and "Good" indicates that the surface condition was good and similar to the initial state before the test (ie, no bleed out). Further, the yellowness YI of the light diffusing plate before the above test was measured by the following YI measurement method, which was designated as “initial YI”, and the yellowness YI of the light diffusing plate after the above test was measured. YI ”, and the change amount ΔYI was obtained by the following calculation formula.
ΔYI = (YI after test) − (initial YI)
(250 hours mercury lamp irradiation test)
The light diffusion plate was irradiated with a mercury lamp for 250 hours under the condition of 75 ° C.
(250 hours high temperature and high humidity test)
The light diffusion plate was placed for 250 hours under high temperature and high humidity conditions of 60 ° C. and 90% RH.
(250 hour high temperature test)
The light diffusing plate was placed under a high temperature condition of 80 ° C. for 250 hours.
(250 hour low temperature test)
The light diffusing plate was placed for 250 hours under a low temperature condition of −40 ° C.
(500 hours mercury lamp irradiation test)
The light diffusion plate was irradiated with a mercury lamp for 500 hours under the condition of 75 ° C.
(500 hours high temperature and high humidity test)
The light diffusion plate was placed for 500 hours under high temperature and high humidity conditions of 60 ° C. and 90% RH.
(500 hours high temperature test)
The light diffusing plate was placed under high temperature conditions of 80 ° C. for 500 hours.
(500 hours low temperature test)
The light diffusing plate was placed for 500 hours under a low temperature condition of −40 ° C.
[Yellowness YI measurement method]
Using a spectrophotometer equipped with an integrating sphere (“UV-4000” manufactured by Hitachi, Ltd.), the spectral transmittance in the wavelength range of 380 to 780 nm of the light diffusion plate was measured, and based on this, the yellowness YI was calculated. .
As is apparent from Tables 1 to 3, the light diffusing plates of Examples 1 to 9 of the present invention sufficiently suppress discoloration even after a mercury lamp irradiation test, a high temperature and high humidity test, a high temperature test, and a low temperature test for 500 hours. And no bleed-out occurred.
In the light diffusing plates of Examples 1 and 2, the addition amount of the hindered amine light stabilizer with respect to 100 parts by mass of the propylene resin is a small addition amount in the range of 0.1 parts by mass to 2.0 parts by mass. In the light diffusion plate of No. 5, the addition amount of the hindered amine light stabilizer and the ultraviolet absorber with respect to 100 parts by mass of the propylene resin is a small addition amount ranging from 0.1 parts by mass to 2.0 parts by mass. The light diffusing plates of Examples 1 to 5 have such a small addition amount (low cost), ΔYI is smaller than 5 and the discoloration is sufficiently suppressed, mercury lamp irradiation test, high temperature and high humidity Even if a test, a high temperature test, and a low temperature test are performed for 500 hours, bleed-out does not occur, which is particularly preferable.
In contrast, in Comparative Examples 1 to 5 that deviated from the specified range of the present invention, bleeding out occurred in 250 hours when the mercury lamp irradiation test, the high temperature and high humidity test, the high temperature test, and the low temperature test were performed.
<実施例1>
プロピレン樹脂(住友化学社製「FSX20L8」)99.1質量部、チヌビンXT850FF(チバ・ジャパン社製)0.5質量部、スミライザーGP(住友化学社製、熱安定剤)0.2質量部、アデカスタブNA11(ADEKA社製、リン酸エステル系造核剤)0.2質量部をドライブレンドした後、スクリュー径40mmの押出機に供給して210~250℃で溶融混練し、マルチマニホールドダイを経由してダイ温度250~260℃で押出すことによって、光拡散板(厚さ1.5mm、幅250mm)を得た。
<実施例2~9、比較例1~5>
表1~3に示す材料を表1~3に示す割合でそれぞれ用いた以外は、実施例1と同様にして光拡散板を得た。
なお、表中に記載の「LA31」は、ADEKA社製の紫外線吸収剤であり、「イルガフォス168」は、チバ・ジャパン社製の熱安定剤である。
<耐久性評価法>
各光拡散板について下記の水銀灯照射試験、高温高湿試験、高温試験、低温試験を行い、試験後の光拡散板の表面状態を目視観察し、表面に粉が付着しているもの(即ちブリードアウトしているもの)を「×」とし、表面に粉の付着がなく試験前の初期状態と同様の良好な表面状態であるもの(即ちブリードアウトがないもの)を「○」とした。また、下記YI測定法により上記試験前の光拡散板の黄色度YIを測定し、これを「初期YI」とし、上記試験後の光拡散板の黄色度YIを測定し、これを「試験後YI」とし、変化量ΔYIを下記算出式により求めた。
ΔYI=(試験後YI)−(初期YI)
(250時間水銀灯照射試験)
75℃条件下において光拡散板に対して水銀灯照射を250時間行った。
(250時間高温高湿試験)
60℃90%RHの高温高湿条件下に光拡散板を250時間配置した。
(250時間高温試験)
80℃の高温条件下に光拡散板を250時間配置した。
(250時間低温試験)
−40℃の低温条件下に光拡散板を250時間配置した。
(500時間水銀灯照射試験)
75℃条件下において光拡散板に対して水銀灯照射を500時間行った。
(500時間高温高湿試験)
60℃90%RHの高温高湿条件下に光拡散板を500時間配置した。
(500時間高温試験)
80℃の高温条件下に光拡散板を500時間配置した。
(500時間低温試験)
−40℃の低温条件下に光拡散板を500時間配置した。
[黄色度YI測定法]
積分球を備えた自記分光光度計(日立製作所製「UV−4000」)を用いて光拡散板の380~780nmの波長範囲の分光透過率を測定し、これに基づいて黄色度YIを算出した。
表1~3から明らかなように、本発明の実施例1~9の光拡散板は、水銀灯照射試験、高温高湿試験、高温試験、低温試験を500時間行っても、変色が十分に抑制されていると共に、ブリードアウトも生じなかった。
実施例1、2の光拡散板は、プロピレン樹脂100質量部に対するヒンダードアミン系光安定剤の添加量が0.1質量部~2.0質量部の範囲という少ない添加量であり、実施例3~5の光拡散板は、プロピレン樹脂100質量部に対するヒンダードアミン系光安定剤および紫外線吸収剤の添加量がいずれも0.1質量部~2.0質量部の範囲という少ない添加量であり、これら実施例1~5の光拡散板は、このように少ない添加量でありながら(低コストでありながら)、ΔYIが5より小さくて変色が十分に抑制されていると共に、水銀灯照射試験、高温高湿試験、高温試験、低温試験を500時間行ってもブリードアウトを生じないので、特に好適である。
これに対し、本発明の規定範囲を逸脱する比較例1~5では、水銀灯照射試験、高温高湿試験、高温試験、低温試験を行うと、250時間でブリードアウトを生じた。 Next, specific examples of the present invention will be described, but the present invention is not particularly limited to these examples.
<Example 1>
99.1 parts by mass of propylene resin ("FSX20L8" manufactured by Sumitomo Chemical Co., Ltd.), 0.5 parts by mass of Tinuvin XT850FF (Ciba Japan Co., Ltd.), 0.2 parts by mass of Sumizer GP (manufactured by Sumitomo Chemical Co., Ltd., thermal stabilizer), After dry blending 0.2 part by weight of ADK STAB NA11 (manufactured by ADEKA, phosphate ester nucleating agent), it is supplied to an extruder with a screw diameter of 40 mm and melt-kneaded at 210-250 ° C., via a multi-manifold die Then, a light diffusion plate (thickness 1.5 mm, width 250 mm) was obtained by extrusion at a die temperature of 250 to 260 ° C.
<Examples 2 to 9, Comparative Examples 1 to 5>
A light diffusing plate was obtained in the same manner as in Example 1 except that the materials shown in Tables 1 to 3 were used in the ratios shown in Tables 1 to 3, respectively.
In the table, “LA31” is an ultraviolet absorber made by ADEKA, and “Irgaphos 168” is a heat stabilizer made by Ciba Japan.
<Durability evaluation method>
Each light diffusion plate is subjected to the following mercury lamp irradiation test, high-temperature and high-humidity test, high-temperature test, and low-temperature test, the surface state of the light diffusion plate after the test is visually observed, and powder is adhered to the surface (that is, bleeding) "No"), and "Good" indicates that the surface condition was good and similar to the initial state before the test (ie, no bleed out). Further, the yellowness YI of the light diffusing plate before the above test was measured by the following YI measurement method, which was designated as “initial YI”, and the yellowness YI of the light diffusing plate after the above test was measured. YI ”, and the change amount ΔYI was obtained by the following calculation formula.
ΔYI = (YI after test) − (initial YI)
(250 hours mercury lamp irradiation test)
The light diffusion plate was irradiated with a mercury lamp for 250 hours under the condition of 75 ° C.
(250 hours high temperature and high humidity test)
The light diffusion plate was placed for 250 hours under high temperature and high humidity conditions of 60 ° C. and 90% RH.
(250 hour high temperature test)
The light diffusing plate was placed under a high temperature condition of 80 ° C. for 250 hours.
(250 hour low temperature test)
The light diffusing plate was placed for 250 hours under a low temperature condition of −40 ° C.
(500 hours mercury lamp irradiation test)
The light diffusion plate was irradiated with a mercury lamp for 500 hours under the condition of 75 ° C.
(500 hours high temperature and high humidity test)
The light diffusion plate was placed for 500 hours under high temperature and high humidity conditions of 60 ° C. and 90% RH.
(500 hours high temperature test)
The light diffusing plate was placed under high temperature conditions of 80 ° C. for 500 hours.
(500 hours low temperature test)
The light diffusing plate was placed for 500 hours under a low temperature condition of −40 ° C.
[Yellowness YI measurement method]
Using a spectrophotometer equipped with an integrating sphere (“UV-4000” manufactured by Hitachi, Ltd.), the spectral transmittance in the wavelength range of 380 to 780 nm of the light diffusion plate was measured, and based on this, the yellowness YI was calculated. .
As is apparent from Tables 1 to 3, the light diffusing plates of Examples 1 to 9 of the present invention sufficiently suppress discoloration even after a mercury lamp irradiation test, a high temperature and high humidity test, a high temperature test, and a low temperature test for 500 hours. And no bleed-out occurred.
In the light diffusing plates of Examples 1 and 2, the addition amount of the hindered amine light stabilizer with respect to 100 parts by mass of the propylene resin is a small addition amount in the range of 0.1 parts by mass to 2.0 parts by mass. In the light diffusion plate of No. 5, the addition amount of the hindered amine light stabilizer and the ultraviolet absorber with respect to 100 parts by mass of the propylene resin is a small addition amount ranging from 0.1 parts by mass to 2.0 parts by mass. The light diffusing plates of Examples 1 to 5 have such a small addition amount (low cost), ΔYI is smaller than 5 and the discoloration is sufficiently suppressed, mercury lamp irradiation test, high temperature and high humidity Even if a test, a high temperature test, and a low temperature test are performed for 500 hours, bleed-out does not occur, which is particularly preferable.
In contrast, in Comparative Examples 1 to 5 that deviated from the specified range of the present invention, bleeding out occurred in 250 hours when the mercury lamp irradiation test, the high temperature and high humidity test, the high temperature test, and the low temperature test were performed.
本発明の光拡散板は、面光源装置用の光拡散板として好適に用いられるが、特にこのような用途に限定されるものではない。また、本発明の面光源装置は、液晶表示装置用のバックライトとして好適に用いられるが、特にこのような用途に限定されるものではない。
The light diffusing plate of the present invention is suitably used as a light diffusing plate for a surface light source device, but is not particularly limited to such applications. The surface light source device of the present invention is preferably used as a backlight for a liquid crystal display device, but is not particularly limited to such applications.
1…面光源装置
2…光源
3…光拡散板
20…液晶パネル
30…液晶表示装置 DESCRIPTION OF SYMBOLS 1 ... Surface light source device 2 ...Light source 3 ... Light diffusing plate 20 ... Liquid crystal panel 30 ... Liquid crystal display device
2…光源
3…光拡散板
20…液晶パネル
30…液晶表示装置 DESCRIPTION OF SYMBOLS 1 ... Surface light source device 2 ...
Claims (6)
- プロピレン樹脂100質量部ならびに以下の式(I)で表される第1ヒンダードアミン系光安定剤、以下の式(II)で表される第2ヒンダードアミン系光安定剤および以下の式(XI)で表される第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤0.03質量部~10質量部を含有する樹脂組成物からなる光拡散板。
(式中、R11およびR12は、それぞれ独立に、水素原子、炭素原子数が1~24の直鎖アルキル基または炭素原子数が3~24の分岐アルキル基を表し、nは、1~100の整数である。)
(式中、R21は以下の式(V)で表される置換基を表す。)
(式中、R52はブチル基を表し、R53は以下の式(VI)で表される置換基を表す。)
(式中、R64は、水素原子、炭素原子数が1~12の直鎖アルキル基、炭素原子数が3~12の分岐アルキル基、炭素原子数が1~12の直鎖アルコキシル基または炭素原子数が3~12の分岐アルコキシル基を表す。)
(式中、R101およびR102は、それぞれ独立に、水素原子、炭素原子数が1~24の直鎖アルキル基または炭素原子数が3~24の分岐アルキル基を表す。) 100 parts by mass of propylene resin, a first hindered amine light stabilizer represented by the following formula (I), a second hindered amine light stabilizer represented by the following formula (II), and the following formula (XI) A light diffusing plate comprising a resin composition containing 0.03 to 10 parts by mass of one or more light stabilizers selected from the group consisting of third hindered amine light stabilizers.
(Wherein R 11 and R 12 each independently represents a hydrogen atom, a linear alkyl group having 1 to 24 carbon atoms or a branched alkyl group having 3 to 24 carbon atoms, and n represents 1 to It is an integer of 100.)
(In the formula, R 21 represents a substituent represented by the following formula (V).)
(In the formula, R 52 represents a butyl group, and R 53 represents a substituent represented by the following formula (VI).)
(In the formula, R 64 represents a hydrogen atom, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 3 to 12 carbon atoms, a linear alkoxyl group having 1 to 12 carbon atoms, or carbon. Represents a branched alkoxyl group having 3 to 12 atoms.)
(In the formula, R 101 and R 102 each independently represent a hydrogen atom, a linear alkyl group having 1 to 24 carbon atoms, or a branched alkyl group having 3 to 24 carbon atoms.) - 前記樹脂組成物は、前記プロピレン樹脂100質量部に対して更に以下の式(III)で表される第1紫外線吸収剤および以下の式(IV)で表される第2紫外線吸収剤からなる群より選ばれる1種以上の紫外線吸収剤を0.03質量部~10質量部含有する請求項1に記載の光拡散板。
(式中、R31、R32およびR33は、それぞれ独立に、水素原子、メチル基、tert−ブチル基、tert−オクチル基、−O(CH2)7CH3または以下の式(VII)で表される置換基を表し、Xは水素原子または塩素原子を表す。)
(式中、R41、R42、R43およびR44は、それぞれ独立に、水素原子、シアノ基、フェニル基、−COOCH3、−COOC2H5、以下の式(VIII)で表される置換基、以下の式(IX)で表される置換基または以下の式(X)で表される置換基を表す。)
(式中、R105およびR106はそれぞれ、−COOC2H5を表す。) The resin composition further comprises a first ultraviolet absorber represented by the following formula (III) and a second ultraviolet absorber represented by the following formula (IV) with respect to 100 parts by mass of the propylene resin. The light diffusing plate according to claim 1, comprising 0.03 parts by mass to 10 parts by mass of at least one ultraviolet absorber selected from the above.
(Wherein R 31 , R 32 and R 33 each independently represents a hydrogen atom, a methyl group, a tert-butyl group, a tert-octyl group, —O (CH 2 ) 7 CH 3 or the following formula (VII): And X represents a hydrogen atom or a chlorine atom.)
(In the formula, R 41 , R 42 , R 43 and R 44 are each independently represented by a hydrogen atom, a cyano group, a phenyl group, —COOCH 3 , —COOC 2 H 5 , and the following formula (VIII): A substituent, a substituent represented by the following formula (IX) or a substituent represented by the following formula (X) is represented.)
(Wherein R 105 and R 106 each represent —COOC 2 H 5 ) - 前記樹脂組成物は、前記プロピレン樹脂100質量部に対して更に以下の式(III)で表される第1紫外線吸収剤を0.03質量部~10質量部含有する請求項1に記載の光拡散板。
(式中、R31、R32およびR33は、それぞれ独立に、水素原子、メチル基、tert−ブチル基、tert−オクチル基、−O(CH2)7CH3または以下の式(VII)で表される置換基を表し、Xは水素原子または塩素原子を表す。)
The light according to claim 1, wherein the resin composition further contains 0.03 to 10 parts by mass of a first ultraviolet absorber represented by the following formula (III) with respect to 100 parts by mass of the propylene resin. Diffusion plate.
(Wherein R 31 , R 32 and R 33 each independently represents a hydrogen atom, a methyl group, a tert-butyl group, a tert-octyl group, —O (CH 2 ) 7 CH 3 or the following formula (VII): And X represents a hydrogen atom or a chlorine atom.)
- プロピレン樹脂100質量部ならびに以下の式(I)で表される第1ヒンダードアミン系光安定剤、以下の式(II)で表される第2ヒンダードアミン系光安定剤および以下の式(XI)で表される第3ヒンダードアミン系光安定剤からなる群より選ばれる1種以上の光安定剤0.03質量部~10質量部を含有する樹脂組成物からなり、該樹脂組成物は紫外線吸収剤を含有しないものである光拡散板。
(式中、R11およびR12は、それぞれ独立に、水素原子、炭素原子数が1~24の直鎖アルキル基または炭素原子数が3~24の分岐アルキル基を表し、nは、1~100の整数である。)
(式中、R21は以下の式(V)で表される置換基を表す。)
(式中、R52はブチル基を表し、R53は以下の式(VI)で表される置換基を表す。)
(式中、R64は、水素原子、炭素原子数が1~12の直鎖アルキル基、炭素原子数が3~12の分岐アルキル基、炭素原子数が1~12の直鎖アルコキシル基または炭素原子数が3~12の分岐アルコキシル基を表す。)
(式中、R101およびR102は、それぞれ独立に、水素原子、炭素原子数が1~24の直鎖アルキル基または炭素原子数が3~24の分岐アルキル基を表す。) 100 parts by mass of propylene resin, a first hindered amine light stabilizer represented by the following formula (I), a second hindered amine light stabilizer represented by the following formula (II), and the following formula (XI) A resin composition containing 0.03 parts by mass to 10 parts by mass of one or more light stabilizers selected from the group consisting of third hindered amine light stabilizers, and the resin composition contains an ultraviolet absorber A light diffusing plate that does not.
(Wherein R 11 and R 12 each independently represents a hydrogen atom, a linear alkyl group having 1 to 24 carbon atoms or a branched alkyl group having 3 to 24 carbon atoms, and n represents 1 to It is an integer of 100.)
(In the formula, R 21 represents a substituent represented by the following formula (V).)
(In the formula, R 52 represents a butyl group, and R 53 represents a substituent represented by the following formula (VI).)
(In the formula, R 64 represents a hydrogen atom, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 3 to 12 carbon atoms, a linear alkoxyl group having 1 to 12 carbon atoms, or carbon. Represents a branched alkoxyl group having 3 to 12 atoms.)
(In the formula, R 101 and R 102 each independently represent a hydrogen atom, a linear alkyl group having 1 to 24 carbon atoms, or a branched alkyl group having 3 to 24 carbon atoms.) - 請求項1~4のいずれか1項に記載の光拡散板と、該光拡散板の背面側に配置された複数の光源とを備える面光源装置。 A surface light source device comprising: the light diffusing plate according to any one of claims 1 to 4; and a plurality of light sources arranged on a back side of the light diffusing plate.
- 請求項1~4のいずれか1項に記載の光拡散板と、該光拡散板の背面側に配置された複数の光源と、前記光拡散板の前面側に配置された液晶パネルとを備える液晶表示装置。 5. A light diffusing plate according to claim 1, a plurality of light sources arranged on the back side of the light diffusing plate, and a liquid crystal panel arranged on the front side of the light diffusing plate. Liquid crystal display device.
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JP2008329118 | 2008-12-25 | ||
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JP2009129971 | 2009-05-29 |
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WO2017076772A1 (en) * | 2015-11-02 | 2017-05-11 | Sabic Global Technologies B.V. | Light diffusing article |
WO2018019764A1 (en) | 2016-07-29 | 2018-02-01 | Sabic Global Technologies B.V. | Light diffusing article |
CN115895108A (en) * | 2022-11-01 | 2023-04-04 | 上海睿聚环保科技有限公司 | Waste PP recycled plastic for high-transparency injection molding product |
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JP2008083660A (en) * | 2006-08-28 | 2008-04-10 | Sumitomo Chemical Co Ltd | Light diffusing plate |
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JP2008216609A (en) * | 2007-03-05 | 2008-09-18 | Sumitomo Chemical Co Ltd | Optical diffusion plate and surface light source device, and liquid crystal display device |
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2009
- 2009-12-22 WO PCT/JP2009/071850 patent/WO2010074312A1/en active Application Filing
- 2009-12-22 JP JP2009290134A patent/JP2011008216A/en active Pending
- 2009-12-23 TW TW098144494A patent/TW201035113A/en unknown
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JP2002098808A (en) * | 2000-09-25 | 2002-04-05 | Toray Ind Inc | White laminated polyester film for reflecting member of planar light source |
WO2007069760A1 (en) * | 2005-12-14 | 2007-06-21 | Sumitomo Chemical Company, Limited | Polyolefin resin composition, molded body made of same, and method for producing polyolefin resin composition |
JP2008083660A (en) * | 2006-08-28 | 2008-04-10 | Sumitomo Chemical Co Ltd | Light diffusing plate |
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WO2017076772A1 (en) * | 2015-11-02 | 2017-05-11 | Sabic Global Technologies B.V. | Light diffusing article |
WO2018019764A1 (en) | 2016-07-29 | 2018-02-01 | Sabic Global Technologies B.V. | Light diffusing article |
CN115895108A (en) * | 2022-11-01 | 2023-04-04 | 上海睿聚环保科技有限公司 | Waste PP recycled plastic for high-transparency injection molding product |
CN115895108B (en) * | 2022-11-01 | 2024-04-19 | 上海睿聚环保科技有限公司 | Waste PP regenerated plastic for high-transparency injection molding product |
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JP2011008216A (en) | 2011-01-13 |
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