Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
  • B32B25/16—Layered products comprising a layer of natural or synthetic rubber comprising polydienes homopolymers or poly-halodienes homopolymers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
  • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
  • B32B27/325—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polycycloolefins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
  • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/04—Homopolymers or copolymers of ethene
  • C08L23/08—Copolymers of ethene
  • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
  • C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
  • C08L23/0823—Copolymers of ethene with aliphatic cyclic olefins
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
  • C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
  • C08L53/025—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes modified
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
  • F21V7/00—Reflectors for light sources
  • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
  • F21V7/24—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2274/00—Thermoplastic elastomer material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/30—Properties of the layers or laminate having particular thermal properties
  • B32B2307/306—Resistant to heat
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/40—Properties of the layers or laminate having particular optical properties
  • B32B2307/416—Reflective
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/546—Flexural strength; Flexion stiffness
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/732—Dimensional properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2457/00—Electrical equipment
  • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
  • B32B2457/202—LCD, i.e. liquid crystal displays
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/08—Mirrors

Definitions

• the present invention relates to a reflector that can be suitably used as a constituent member of a liquid crystal display, a lighting fixture, or a lighting signboard.
• Reflective materials are used in many fields, including liquid crystal displays, lighting fixtures, and lighting signs. Recently, in the field of liquid crystal displays, the size of the device and the advancement of display performance have advanced, and it has become necessary to improve the performance of the backlight unit by supplying as much light as possible to the liquid crystal. However, even more excellent light reflectivity (also simply referred to as “reflectivity”) has been demanded.
• a reflective film for a liquid crystal display using a white polyester film mainly composed of an aromatic polyester resin is known (see Patent Document 1).
• an aromatic polyester-based resin is used as a material for the reflector, the aromatic ring contained in the molecular chain of the aromatic polyester-based resin absorbs ultraviolet rays, and therefore, by ultraviolet rays emitted from a light source such as a liquid crystal display device, There was a problem that the film deteriorated and yellowed, and the light reflectivity of the reflective film was lowered.
• Patent Document 2 by stretching a film formed by adding a filler to a polypropylene resin, a fine void is formed in the film, and light scattering reflection is caused (refer to Patent Document 2), olefin-based
• An olefin-based resin light reflector having a laminated structure including a base material layer containing a resin and a filler and a layer containing an olefin-based resin is also known (see Patent Document 3).
• a reflective film using such an olefin resin has a feature that there are few problems of film deterioration and yellowing due to ultraviolet rays.
• a reflective sheet comprising a resin composition that does not contain a large amount of inorganic powder
• a biaxial sheet having a reduced thermal shrinkage rate including a polypropylene resin and at least one resin incompatible with the polypropylene resin.
• a stretched reflective sheet is known (see Patent Document 4). This reflective sheet has a feature of showing higher reflectance than a conventional reflective sheet having the same basis weight and density even if it does not contain a large amount of inorganic powder.
• the reflective material using an olefin-based resin has few problems of film deterioration and yellowing due to ultraviolet rays, and its usefulness is high.
• the heat resistance is not sufficient, when used as a constituent member of a liquid crystal display that requires heat resistance, there are problems such as shrinkage of the film due to heat and waviness.
• light sources with high-temperature heat generation such as LEDs have been used, and further heat resistance has been demanded by reflecting materials.
• a reflective material that has been subjected to a bending process or the like may be used by being incorporated in a liquid crystal display device, and such a bending property is also required for the reflective material.
• an object of the present invention is to provide a new reflector having excellent reflectivity, excellent heat resistance and folding resistance, and not shrinking even in a high temperature environment.
• the inventor of the present invention has focused on cycloolefin-based resin as a heat-resistant resin that absorbs less visible light as a main raw material constituting the reflector.
• a reflector using a cycloolefin resin has a problem in bending resistance when bending according to the shape of the back chassis of the liquid crystal display.
• the said subject could be solved by mix
• the present invention proposes a reflector having a resin layer (A) containing a cycloolefin resin and an olefin resin other than the cycloolefin resin and / or a thermoplastic elastomer.
• the reflective material of the present invention includes a resin layer (A) containing a cycloolefin resin and an olefin resin other than the cycloolefin resin and / or a thermoplastic elastomer, the cycloolefin resin alone cannot be obtained.
• the reflective material of this invention can be used suitably as reflective materials, such as a liquid crystal display, a lighting fixture, or an illumination signboard.
• the present reflective material As an example of an embodiment of the present invention will be described.
• the present invention is not limited to this reflector.
• This reflective material is a reflective material provided with a resin layer (A) containing a cycloolefin resin and an olefin resin other than the cycloolefin resin and / or a thermoplastic elastomer.
• this reflective material should just be equipped with the resin layer (A), you may be provided with the other layer.
• the structure provided with the resin layer (A) and the resin layer (B) containing an olefin resin is one of the preferable laminated structures of the present reflective material. Therefore, in the following, after describing each of the resin layer (A) and the resin layer (B), the laminated structure, thickness, physical properties (reflectance, porosity, folding strength), manufacturing method, use, etc. of the present reflective material A description will be made sequentially.
• the resin layer (A) is a layer containing a cycloolefin resin and an olefin resin other than the cycloolefin resin and / or a thermoplastic elastomer as main components, and further a fine powder filler for improving the reflection performance. It may contain.
• the cycloolefin resin of the resin layer (A) may be a cycloolefin homopolymer or a cycloolefin copolymer.
• the cycloolefin-based resin is a polymer compound having a main chain composed of a carbon-carbon bond and having a cyclic hydrocarbon structure in at least a part of the main chain. This cyclic hydrocarbon structure is introduced by using a compound (cycloolefin) having at least one olefinic double bond in the cyclic hydrocarbon structure as represented by norbornene or tetracyclododecene as a monomer. Is done.
• Cycloolefin-based resins include cycloolefin addition (co) polymers or hydrogenated products thereof, cycloolefin and ⁇ -olefin addition copolymers or hydrogenated products thereof, cycloolefin ring-opening (co) polymers or the like. They are classified as hydrogenated substances, and any of them can be used for the present reflective material.
• cycloolefin resin examples include cyclopentene, cyclohexene, cyclooctene; one-ring cycloolefin such as cyclopentadiene, 1,3-cyclohexadiene; bicyclo [2.2.1] hept-2-ene (common name) : Norbornene), 5-methyl-bicyclo [2.2.1] hept-2-ene, 5,5-dimethyl-bicyclo [2.2.1] hept-2-ene, 5-ethyl-bicyclo [2.
• hept-2-ene 5-butyl-bicyclo [2.2.1] hept-2-ene, 5-ethylidene-bicyclo [2.2.1] hept-2-ene, 5-hexyl- Bicyclo [2.2.1] hept-2-ene, 5-octyl-bicyclo [2.2.1] hept-2-ene, 5-octadecyl-bicyclo [2.2.1] hept-2-ene, 5 Methylidene-bicyclo [2.2.1] hept-2-ene, 5-vinyl-bicyclo [2.2.1] hept-2-ene, 5-propenyl-bicyclo [2.2.1] hept-2- Bicyclic cycloolefins such as ene;
• Tricyclo [4.3.0.12,5] deca-3,7-diene (common name: dicyclopentadiene), tricyclo [4.3.0.12,5] dec-3-ene; tricyclo [4. 4.0.12,5] undeca-3,7-diene or tricyclo [4.4.0.12,5] undeca-3,8-diene or a partially hydrogenated product thereof (or addition of cyclopentadiene and cyclohexene) Tricyclo [4.4.0.12,5] undec-3-ene; 5-cyclopentyl-bicyclo [2.2.1] hept-2-ene, 5-cyclohexyl-bicyclo [2.2.
• tricyclic cycloolefins such as hepta-2-ene, 5-cyclohexenylbicyclo [2.2.1] hept-2-ene, 5-phenyl-bicyclo [2.2.1] hept-2-ene;
• Tetracyclo [4.4.0.12,5.17,10] dodec-3-ene also simply referred to as tetracyclododecene
• ⁇ -olefin copolymerizable with cycloolefin examples include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 3-methyl-1-pentene, 3 -Ethyl-1-pentene, 4-methyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-hexene, 4,4-dimethyl-1-pentene, 4-ethyl-1- Hexene, 3-ethyl-1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, etc. 2-20, preferably carbon numbers Examples thereof include 2 to 8 ethylene or ⁇ -olefin. These ⁇ -olefins can be used alone or in combination of two or more.
• the glass transition temperature (Tg) is 70 to 170 ° C., particularly 80 ° C. or more and 160 ° C. or less, and particularly 85 ° C. or more and 150 ° C. or less. Is preferred.
• two or more types of cycloolefin resins may be combined and mixed, and the glass transition temperature (Tg) of the mixed resin may be adjusted to the above range.
• cycloolefin resin a commercially available product can be used as the cycloolefin resin.
• ZEONOR registered trademark
• APEL® ethylene and tetracyclododecene
• TOPAS addition copolymer of ethylene and norbornene
• ZEONOR registered trademark
• TOPAS registered trademark
• ethylene manufactured by Polyplastics Co., Ltd.
• a norbornene addition copolymer are particularly preferable because a reflective material having high reflection performance can be obtained.
• the norbornene content is preferably 60 to 90 wt%, particularly preferably 65 wt% or more and 80 wt% or less.
• the resin layer (A) By forming the resin layer (A) by blending the cycloolefin resin with an olefin resin other than the cycloolefin resin and / or a thermoplastic elastomer, the resin layer (A) containing only the cycloolefin resin as a main component. It is possible to ensure both the folding resistance that was not obtained when the resin layer was formed and the heat resistance that was not obtained when the resin layer (A) was formed using only the olefin resin as a main component.
• the melt flow rate (referred to as “MFR”) of the olefin resin other than the cycloolefin resin and / or the thermoplastic elastomer is 0.1 or more, or 20 or less (JIS K7210, 230 ° C., load 21.18 N). In particular, it is more preferably 0.5 or more, or 10 or less. Moreover, it is preferable to adjust MFR of cycloolefin resin to the said range.
• olefin-based resins other than cycloolefin-based resins and / or thermoplastic elastomers are oriented in the cycloolefin-based resin, and the mechanical properties as a reflector are extremely deteriorated. Since there is no fear, it is particularly preferable.
• olefin resins other than cycloolefin resins include polypropylene resins such as polypropylene and propylene-ethylene copolymers, and polyethylene resins such as polyethylene, high-density polyethylene, and low-density polyethylene.
• polyethylene resin (PE) and polypropylene resin (PP) are preferable, and polypropylene resin is particularly preferable from the viewpoint of having a high melting point and excellent heat resistance compared to PE and high mechanical properties such as elastic modulus. (PP) is preferred.
• PP polypropylene resin having an MFR (230 ° C. 21.18N) of 0.1 to 20, particularly 0.2 to 10, and particularly 0.5 to 5 is preferable.
• MFR 230 ° C. 21.18N
• thermoplastic elastomer examples include olefin-based elastomers, styrene-based elastomers, urethane-based elastomers, polyester-based elastomers, and the like, and one or more of these can be used in combination.
• the styrene elastomer is preferable from the viewpoint of improving the adhesion between the resin layer (A) and the resin layer (B) because it is compatible with the olefin resin of the resin layer (B), particularly the polypropylene resin.
• a polypropylene resin is employed as the olefin resin of the resin layer (B), and the thermoplastic elastomer of the resin layer (A). It is more preferable to employ a styrene-based elastomer.
• styrene elastomer examples include a copolymer of styrene and a conjugated diene such as butadiene or isoprene, and / or a hydrogenated product thereof.
• Styrenic elastomers are preferred because they are block copolymers having styrene as a hard segment and conjugated diene as a soft segment and do not require a vulcanization step.
• a hydrogenated product is more preferable because of high thermal stability.
• styrene elastomer examples include, for example, a styrene-butadiene-styrene block copolymer, a styrene-isoprene-styrene block copolymer, a styrene-ethylene-butylene-styrene block copolymer, and a styrene-ethylene-propylene-styrene block. Mention may be made of copolymers.
• styrene-ethylene-butylene-styrene block copolymers and styrene-ethylene-propylene-styrene block copolymers are particularly preferred. .) Is preferred.
• the resin layer A may contain a fine powder filler to obtain light reflectivity.
• fine powder filler in addition to refractive scattering due to the difference in refractive index, refractive scattering due to refractive index difference from the cavity formed around the fine powder filler, and further formed around the fine powder filler.
• Light reflectivity can also be obtained from refractive scattering due to a difference in refractive index between the cavity and the fine powder filler.
• a reflective material having a laminated structure of the resin layer (A) and the resin layer (B) sufficient light can be obtained if the resin layer (B) contains a fine powder filler. Since reflectivity can be ensured, the resin layer (A) may not contain a fine powder filler.
• Examples of the fine powder filler include inorganic fine powder and organic fine powder.
• Inorganic fine powders include calcium carbonate, magnesium carbonate, barium carbonate, magnesium sulfate, barium sulfate, calcium sulfate, zinc oxide, magnesium oxide, calcium oxide, titanium oxide, zinc oxide, alumina, aluminum hydroxide, hydroxyapatite, silica,
• Examples include mica, talc, kaolin, clay, glass powder, asbestos powder, zeolite, silicate clay. Any of these may be used alone or in admixture of two or more.
• titanium oxide has a significantly higher refractive index than other inorganic fillers, and can significantly increase the difference in refractive index from the base resin, so it can be used in a smaller amount than when other fillers are used. Excellent reflectivity can be obtained. Furthermore, by using titanium oxide, high light reflectivity can be obtained even if the thickness of the reflector is reduced. Therefore, it is more preferable to use a filler containing at least titanium oxide.
• the amount of titanium oxide is 30% or more of the total mass of the inorganic filler, or a combination of an organic filler and an inorganic filler. In such a case, the total mass is preferably 30% or more.
• the surface of the fine filler is subjected to a surface treatment with a silicon compound, a polyhydric alcohol compound, an amine compound, a fatty acid, a fatty acid ester, or the like. May be used.
• organic fine powder examples include polymer beads and polymer hollow particles, which can be used alone or in combination of two or more. A combination of inorganic fine powder and organic fine powder may be used.
• the fine powder filler preferably has a particle size of 0.05 ⁇ m or more and 15 ⁇ m or less, more preferably 0.1 ⁇ m or more or 10 ⁇ m or less. If the particle size of the filler is 0.05 ⁇ m or more, the dispersibility in the base resin does not decrease, and a homogeneous reflector can be obtained. If the particle size is 15 ⁇ m or less, the interface between the base resin and the fine powder filler is densely formed, and a highly reflective reflector is obtained.
• the amount of the fine filler is preferably 10 to 80% by mass with respect to the total mass of the resin layer (A) in consideration of the light reflectivity, mechanical strength, productivity, etc. of the reflector. More preferably, it is 20 to 70% by mass.
• the content of the fine powder filler is 20% by mass or more, the area of the interface between the base resin and the fine powder filler can be sufficiently secured, and high reflectivity can be imparted to the reflector.
• the content of the fine powder filler is 70% by mass or less, the mechanical strength necessary for the reflector can be ensured.
• the resin layer A may contain other resins (referred to as “other component resins”) including thermoplastic elastomers. Moreover, you may contain antioxidant, a light stabilizer, a heat stabilizer, a dispersing agent, a ultraviolet absorber, a fluorescent whitening agent, a compatibilizer, a lubricant, and other additives.
• other resins referred to as “other component resins”.
• antioxidant a light stabilizer, a heat stabilizer, a dispersing agent, a ultraviolet absorber, a fluorescent whitening agent, a compatibilizer, a lubricant, and other additives.
• the resin layer (A) may be a layer composed of a sheet body, or may be a layer formed by forming a thin film (without forming a sheet) by extrusion or coating of the molten resin composition.
• the sheet body may be an unstretched film, a uniaxial or biaxially stretched film, but a stretched film obtained by stretching at least 1.1 times in a uniaxial direction, particularly two An axially stretched film is preferred.
• the resin layer (A) preferably has fine voids in the range of 20% to 80%.
• the porosity of the resin layer (A), that is, the volume ratio of the voids in the resin layer (A) is preferably 20% or more and 80% or less, particularly 25% or more, or 75% or less, In particular, it is preferably 30% or more or 70% or less.
• the resin layer (B) is a layer containing an olefin resin as a main component, and may further contain a fine powder filler in order to improve the reflection performance.
• the reflective material includes such a resin layer (B), so that, for example, the resin layer (B) is provided with light reflectivity, and the resin layer (A) has heat resistance. Functional separation such as imparting can be performed, and there are advantages such as higher heat resistance and folding resistance as well as higher reflection performance.
• olefin resin examples include polypropylene resins such as polypropylene and propylene-ethylene copolymers, polyethylene resins such as polyethylene, high-density polyethylene and low-density polyethylene, and ethylene-cyclic olefin copolymers. At least one selected from olefin elastomers such as cycloolefin resins (including the above-mentioned cycloolefin resins), ethylene-propylene rubber (EPR), ethylene-propylene-diene terpolymer (EPDM), etc. Mention may be made of polyolefin resins. Among these, polypropylene resin and polyethylene resin are preferable from the viewpoint of mechanical properties and flexibility, and among these, polypropylene is most preferable.
• the olefin resin of the resin layer (B) is an olefin resin when the resin layer (A) contains an olefin resin from the viewpoint of improving the adhesion between the resin layers (A) and (B). It is preferable to use an olefin-based resin containing the same monomer unit.
• the resin layer B contains a fine powder filler in addition to the olefin resin from the viewpoint of obtaining further reflection performance.
• a fine powder filler in addition to the olefin resin from the viewpoint of obtaining further reflection performance.
• a particle size, and the surface treatment method it is the same as that of the content demonstrated by the resin layer (A), and its preferable example is also the same.
• the content of the fine powder filler contained in the resin layer B is 10 to 80 mass with respect to the mass of the entire resin layer (B) in consideration of the light reflectivity, mechanical strength, productivity, etc. of the reflector. %, Preferably 20 to 70% by mass.
• the content of the fine powder filler is 20% by mass or more, the area of the interface between the base resin and the fine powder filler can be sufficiently secured, and high reflectivity can be imparted to the reflector.
• the content of the fine powder filler is 70% by mass or less, the mechanical strength necessary for the reflector can be ensured.
• antioxidants As other components contained in the resin layer B, other resins may be contained. Moreover, you may contain antioxidant, a light stabilizer, a heat stabilizer, a dispersing agent, a ultraviolet absorber, a fluorescent whitening agent, a compatibilizer, a lubricant, and other additives.
• the resin layer (B) may be a layer formed of a sheet body, or may be a layer formed by forming a thin film of the molten resin composition by extrusion or coating (without forming a sheet).
• the sheet body may be an unstretched film, a uniaxial or biaxially stretched film, but a stretched film obtained by stretching at least 1.1 times in a uniaxial direction, particularly two An axially stretched film is preferred.
• a resin layer (B) has a fine space
• the porosity of the resin layer (B), that is, the volume ratio of the voids in the resin layer (B) is preferably 20% or more and 80% or less, particularly 25% or more, or 75% or less, In particular, it is preferably 30% or more or 70% or less.
• the reflective material may have a single-layer structure composed of the resin layer (A), a two-layer structure including the resin layer (B), or a three-layer structure composed of the resin layers (A) and (B). That is, (A) / (B) / (A) or (B) / (A) / (B) may be used.
• the resin layer (B) By laminating the resin layer (B) in addition to the resin layer (A), the resin layer (A) mainly has a role of imparting heat resistance, and the resin layer (B) mainly has light reflectivity.
• the function of each layer can be separated, for example, the role to be imparted can be given, and all of the reflection performance, heat resistance and folding resistance can be improved.
• it may have a multilayer structure of three or more layers including layers other than the resin layers (A) and (B).
• an adhesive layer may be interposed between the resin layer (A) and the resin layer (B).
• the resin layer (A) is preferably located in the outermost layer, which is the reflective use surface of the reflective material, from the viewpoint of improving the heat resistance of the entire reflective material.
• the thickness of the reflective material is not particularly limited, and is preferably, for example, 30 ⁇ m to 1500 ⁇ m, and particularly preferably about 50 ⁇ m to 1000 ⁇ m in consideration of handling in practical use.
• the thickness of the reflective material for use in a liquid crystal display is preferably 50 ⁇ m to 700 ⁇ m.
• the thickness of the reflective material for use in a lighting fixture or lighting signboard is preferably 100 ⁇ m to 1000 ⁇ m.
• the total thickness ratio of each layer of the resin layer (A) and the resin layer (B) (for example, when there are two resin layers (A), two layers)
• the ratio of the total thickness is preferably 1: 2 to 1:15. It is preferable that the thickness ratio of the resin layer (A) and the resin layer (B) is 1: 2 or more and the thickness ratio of the resin layer (B) is large because the reflection characteristics are not adversely affected. Moreover, since flexibility becomes sufficient, it becomes easy to obtain good folding workability, which is preferable. Moreover, since the heat resistance is obtained if the thickness ratio of the resin layer (A) is larger than the thickness ratio of the resin layer (A) and the resin layer (B) of 1:15 or more, it is preferable.
• the present reflective material can have an average reflectance of at least one surface of 97% or more with respect to light having a wavelength of 420 nm to 700 nm. If it has such a reflection performance, it exhibits good reflection characteristics as a reflective material, and a liquid crystal display or the like incorporating this reflective material can achieve a sufficient brightness of the screen.
• the reflective material preferably includes a layer having voids in order to improve reflection performance, and the porosity of the layer, that is, the volume ratio of the voids to the layer is 10% or more, 90% or less, particularly It is preferably 20% or more and 80% or less.
• the layer having voids as described above may be either one of the resin layers (A) and (B), or both, or other layers.
• the resin layer (B) It is preferable to provide the above-mentioned gap only in the case. By providing such voids only in the resin layer (B), the heat resistance of the entire film can be increased, and there is no possibility that the heat resistance is lowered.
• the porosity of the reflecting material can be obtained by the following equation when the void is formed by stretching.
• Porosity (%) ⁇ (density of film before stretching ⁇ density of film after stretching) / density of film before stretching ⁇ ⁇ 100
• This reflector mainly has a bending strength measured by the following test method of 1000 by adjusting the ratio of the cycloolefin resin and the olefin resin and / or thermoplastic elastomer in the resin layer (A). More than once.
• the test method in this case is to use a MIT fatigue resistance tester, apply a load of 9.8 N to a sample cut to a length of 10 cm and a width of 10 mm, a reciprocating bending speed of 175 rpm, and a swing angle of 135 ° left and right. Below, the number of bending until cutting is measured.
• the method for producing the reflective material is not particularly limited, and a known method can be adopted. Below, although an example is given and demonstrated about the manufacturing method of the reflecting material provided with the laminated structure, it is not limited to the following manufacturing method at all.
• a resin composition A is prepared by blending a cycloolefin resin with an olefin resin and / or a thermoplastic elastomer and other additives as required. Specifically, an olefin resin and / or thermoplastic elastomer, other antioxidants, and the like are added to the cycloolefin resin as necessary, mixed with a ribbon blender, tumbler, Henschel mixer, etc., then a Banbury mixer, The resin composition A can be obtained by kneading at a temperature not lower than the resin flow start temperature (for example, 220 ° C. to 270 ° C.) using a single screw or twin screw extruder or the like.
• the resin flow start temperature for example, 220 ° C. to 270 ° C.
• the resin composition A can be obtained by adding a predetermined amount of cycloolefin-based resin, olefin-based resin and / or thermoplastic elastomer or the like with a separate feeder or the like.
• a so-called master batch in which an olefin resin and / or thermoplastic elastomer and other antioxidants are blended at a high concentration in advance is prepared, and this master batch is combined with a cycloolefin resin, olefin resin and / or heat.
• a resin composition A having a desired concentration can be obtained by mixing with a plastic elastomer.
• the resin composition B which mix
• the resin composition A can be obtained by kneading at a temperature equal to or higher than the melting point of the resin (for example, 190 ° C. to 270 ° C.).
• the resin composition B can be obtained by adding a predetermined amount of an olefin resin, a fine powder filler, or the like with a separate feeder or the like.
• a resin composition having a desired concentration is prepared by preparing a so-called master batch in which a fine powder filler, other additives, etc. are blended in high concentration with an olefin resin in advance, and mixing this master batch with the olefin resin. B can also be used.
• the resin compositions A and B are supplied to different extruders, respectively, heated to a predetermined temperature or higher and melted.
• the conditions such as the extrusion temperature need to be set in consideration of the decrease in molecular weight due to decomposition.
• the extrusion temperature of the resin composition A is 220 ° C. to 270 ° C.
• the resin composition B The extrusion temperature is preferably 190 to 270 ° C.
• the obtained cast sheet is preferably stretched in at least one axial direction.
• stretching By extending
• the cast sheet is particularly preferably stretched in the biaxial direction.
• the void formed only by uniaxial stretching has a fibrous form extending in one direction, but by biaxial stretching, the void is elongated in both the vertical and horizontal directions and becomes a disk-shaped form.
• the peeling area at the interface between the olefin resin and the fine powder filler inside the resin layer (B) increases, and the whitening of the sheet further progresses.
• the light reflectivity of the film Can be further enhanced.
• biaxial stretching reduces the anisotropy in the shrinking direction of the film, the heat resistance of the film can be improved, and the mechanical strength of the film can also be increased.
• the stretching temperature when stretching the cast sheet is the glass transition temperature (Tg) of the cycloolefin resin of the resin layer (A) or more and the range of (Tg + 50 ° C.) or less and the range of (Tg + 50 ° C.) or less. It is preferable that the temperature is within the range.
• Tg glass transition temperature
• the stretching temperature is equal to or higher than the glass transition temperature (Tg)
• the stretching orientation becomes high, and as a result, the porosity becomes large, so that a film having a high reflectance is easily obtained.
• the stretching order of biaxial stretching is not particularly limited, and for example, simultaneous biaxial stretching or sequential stretching may be used.
• the film may be stretched to MD by roll stretching, then stretched to TD by tenter stretching, or biaxially stretched by tubular stretching or the like.
• the stretching magnification is preferably 6 times or more as the area magnification. By stretching the area magnification by 6 times or more, there may be a case where the porosity of the entire reflecting material constituted by the resin layer (A) and the resin layer (B) can be 40% or more.
• the treatment temperature for heat-setting the film is preferably 130 to 160 ° C.
• the treatment time required for heat setting is preferably 1 second to 3 minutes.
• stretching which can perform a heat setting process after extending
• the reflective material can be used as a reflective material as it is, but it can also be used as a structure in which the reflective material is laminated on a metal plate or a resin plate, for example, a liquid crystal display such as a liquid crystal display. It is useful as a reflector used in devices, lighting fixtures, lighting signs, and the like.
• examples of the metal plate on which the reflective material is laminated include an aluminum plate, a stainless steel plate, and a galvanized steel plate.
• Examples of the method of laminating the reflective material on a metal plate or resin plate include a method using an adhesive, a method of heat-sealing without using an adhesive, a method of bonding via an adhesive sheet, and extrusion coating. And the like. However, it is not limited to these methods.
• an adhesive such as polyester, polyurethane, or epoxy is applied to the surface of the metal plate or resin plate (collectively referred to as “metal plate”) to which the reflective material is to be bonded.
• metal plate a commonly used coating facility such as a reverse roll coater or a kiss roll coater is used, and the adhesive film thickness after drying is about 2 ⁇ m to 4 ⁇ m on the surface of a metal plate or the like on which a reflective material is bonded.
• Apply an adhesive so that Next, the coated surface is dried and heated with an infrared heater and a hot-air heating furnace, and while maintaining the surface of the metal plate or the like at a predetermined temperature, the reflecting material is immediately coated and cooled using a roll laminator. You can get a board.
• a liquid crystal display includes a liquid crystal panel, a polarizing reflection sheet, a diffusion sheet, a light guide plate, a reflection sheet, a light source, a light source reflector, and the like.
• This reflector can also be used as a reflector that plays a role of making light from a light source efficiently enter a liquid crystal panel or a light guide plate, or condenses light emitted from a light source disposed at an edge portion to guide the light guide plate. It can also be used as a light source reflector having a role of being incident on the light source.
• film refers to a thin flat product that is extremely small compared to its length and width and whose maximum thickness is arbitrarily limited, and is usually supplied in the form of a roll (Japan) Industrial standard JISK6900), and in general, “sheet” refers to a product that is thin by definition in JIS and generally has a thickness that is small instead of length and width.
• sheet refers to a product that is thin by definition in JIS and generally has a thickness that is small instead of length and width.
• main component in the present specification includes the meaning of allowing other components to be contained within a range that does not hinder the function of the main component unless otherwise specified.
• the main component (when two or more components are main components, the total amount thereof) is 50% by mass or more, preferably 70% in the composition. It occupies at least 90% by mass, particularly preferably at least 90% by mass (including 100%).
• X is preferably greater than X” and “preferably Y”, with the meaning of “X to Y” unless otherwise specified. It means “smaller”.
• X or more when expressed as “X is an arbitrary number), it means “preferably larger than X” unless otherwise specified, and “Y or less” (Y is an arbitrary number). ) Includes the meaning of “preferably smaller than Y” unless otherwise specified.
• Porosity Measure the density of the film before stretching (denoted as “unstretched film density”) and the density of the film after stretching (denoted as “stretched film density”), and substitute for the following formula to determine the porosity of the film ( %).
• Porosity (%) ⁇ (Unstretched film density ⁇ Stretched film density) / Unstretched film density ⁇ ⁇ 100
• Heat shrinkage rate (%) A marked line with a width of 200 mm was put on each of MD and TD of the sample (film), and cut out as a sample. The cut sample was placed in a hot air circulating oven at a temperature of 80 ° C. and held for 3 hours, and then the amount of contraction of the sample was measured. The ratio of the shrinkage amount to the original size (200 mm) of the sample before being put in the oven was displayed as a% value, and this was defined as the thermal shrinkage rate (%).
• the resin compositions A and B are respectively supplied to extruders A and B heated to 230 ° C. and 200 ° C., and melt-kneaded at 230 ° C. and 200 ° C. in each extruder, and then used for two types and three layers.
• the sheet was joined to a T die, extruded into a sheet shape so as to have a three-layer structure of resin layer A / resin layer B / resin layer A, and cooled and solidified to form a laminated sheet.
• the resulting laminated sheet was roll-rolled twice to MD at a temperature of 130 ° C., and further biaxially stretched by three-fold tenter stretching to TD at 130 ° C.
• the resin composition A was supplied to an extruder heated to 230 ° C., melted and kneaded at 230 ° C. in the extruder, then extruded into a sheet form from a T-die, and cooled and solidified to form a sheet.
• the obtained sheet was roll-stretched twice to MD at a temperature of 130 ° C., and further biaxially stretched by stretching the tenter to TD at 130 ° C. to obtain a reflector (sample) having a thickness of 233 ⁇ m. . Evaluation similar to Example 1 was performed about the obtained reflecting material.
• Example 6 In the preparation of the resin composition A of Example 5, cycloolefin resin A (manufactured by Polyplastics Co., Ltd., trade name “TOPAS6013”, addition copolymer of ethylene and norbornene, density (ISO1183): 1.02 g / cm 3.
• MFR 230 ° C., 21.18N, JISK-7210: 2 g / 10 min, glass transition temperature Tg (JIS K7121): 138 ° C.) and cycloolefin resin B (manufactured by Polyplastics Co., Ltd., trade name) “TOPAS8007”, addition copolymer of ethylene and norbornene, density (ISO1183): 1.02 g / cm 3 , MFR (230 ° C., 21.18 N, JISK-7210): 10 g / 10 min, glass transition temperature Tg (JISK7121) : 78 ° C) pellets and polypropylene resin ( This Polypropylene Co., Ltd., trade name "Novatec PP FY6HA", density (JISK7112): 0.9g / cm 3 , MFR (230 °C, 21.18N, JISK-7210): and 2.4g / 10min) of the pellet, titanium oxide (KRONOS
• ⁇ Comparative Example 1> (Preparation of resin composition B of resin layer B) After mixing a pellet of polypropylene resin (made by Nippon Polypro Co., Ltd., trade name “Novatech PP FY6HA”) and titanium oxide (made by KRONOS, trade name “KRONOS 2230”) at a mass ratio of 50:50, at 270 ° C.
• the resin composition B was produced by pelletizing using a heated twin screw extruder.
• the resin composition B was supplied to an extruder heated to 200 ° C., melted and kneaded at 200 ° C. in the extruder, then extruded into a sheet form from a T die, and cooled and solidified to form a sheet.
• the obtained sheet was roll-rolled twice to MD at a temperature of 130 ° C., and then biaxially stretched by stretching the tenter to TD at 130 ° C. to obtain a reflective material (sample) having a thickness of 180 ⁇ m. . Evaluation similar to Example 1 was performed about the obtained reflecting material.
• the resin composition A was supplied to an extruder A heated to 230 ° C., melted and kneaded at 230 ° C. in the extruder, then extruded into a sheet form from a T die, and cooled and solidified to form a sheet.
• the obtained sheet was roll-rolled twice to MD at a temperature of 130 ° C. and then biaxially stretched by 135-fold tenter stretching to TD at 135 ° C. to obtain a reflective material (sample) having a thickness of 170 ⁇ m. . Evaluation similar to Example 1 was performed about the obtained reflecting material.
• the reflective materials of Examples 1 to 6 and Comparative Examples 1 and 2 of the present invention have a high light reflectivity with a reflectance of 97% or more with respect to light having a wavelength of 420 nm to 700 nm. I found out. Further, it was found that the folding resistance of the reflectors of Examples 1 to 6 and Comparative Example 1 was good. On the other hand, it was found that the reflective material of Comparative Example 2 was inferior to the reflective materials of Examples 1 to 6 in terms of folding resistance. Further, it was found that the reflective material of Comparative Example 1 was greatly contracted by heat and inferior to the reflective materials of Examples 1 to 6 in terms of heat resistance.

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