Classifications

• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/02—Diffusing elements; Afocal elements
  • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
  • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
  • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
• • 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
  • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
• • 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
  • C08K5/49—Phosphorus-containing compounds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/02—Diffusing elements; Afocal elements
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/02—Diffusing elements; Afocal elements
  • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
  • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
• • 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
  • C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
  • C08K5/41—Compounds containing sulfur bound to oxygen
  • C08K5/42—Sulfonic acids; Derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/49—Phosphorus-containing compounds
  • C08K5/50—Phosphorus bound to carbon only
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
  • C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31507—Of polycarbonate

Definitions

• the present invention is obtained by co-extrusion molding a polycarbonate resin layer containing an antistatic agent having a specific structure and, if desired, a poly-strength prolatatone, on a substrate made of a polycarbonate resin having light diffusibility.
• the present invention relates to a light diffusing polycarbonate resin plate.
• Polycarbonate resins are used in a wide range of applications as resins having excellent mechanical properties, heat resistance and light resistance, as well as high resin and light transmittance. For example, it is also used in large quantities in the construction field of skydomes, top lights, arcades, condominium slats, and road side panels. Many of these applications are milky white light diffusing plates.
• a polycarbonate resin is mixed with a light diffusing agent such as calcium carbonate, barium sulfate, silicon oxide, titanium oxide (Patent Document 1), or a method of dispersing fine particles ( Patent literature 2) and the like have been proposed.
• Patent Document 1 Japanese Patent Publication No.57-24186
• Patent Document 2 Japanese Patent Laid-Open No. 05-257002
• Such a light diffusing polycarbonate resin plate is used for an edge light type or direct backlight type surface light source for liquid crystal displays and a surface light source for scanners.
• the light diffusing plate described in Patent Documents 1 and 2 described above has a minimum function as a member for diffusing light.
• the light diffusing plate is actually incorporated into a surface light source, Problems arise, and display irregularities may occur on the LCD screen due to changes in the usage environment.
• conductive carbon black or carbon fiber is blended.
• black since they are black, it has been difficult to apply them to optical applications such as light diffusion plates.
• metal salts of alkane sulfonates, alkylbenzenes are generally used.
• the strength that had been used as an antistatic agent, etc. When blended with a polycarbonate resin, the color tone becomes white and opaque, so that sufficient light transmission cannot be obtained, so that high brightness as a surface light source cannot be obtained. There was a problem.
• An object of the present invention is to obtain a light-diffusing polycarbonate resin plate having excellent antistatic properties without impairing luminance when incorporated in a surface light source body.
• an antistatic agent having a specific structure and, if desired, a poly force on at least one surface of a substrate made of a light diffusing polycarbonate resin.
• the present inventors have found that a light-diffusing polycarbonate resin plate having excellent antistatic properties can be obtained by co-extrusion molding of a polycarbonate resin layer containing prolatatone.
• the present invention provides a light diffusing material obtained by coextrusion molding a surface layer made of a polycarbonate resin composition containing an antistatic agent on at least one surface of a base material made of a polycarbonate resin composition containing a light diffusing agent.
• the antistatic agent is an organic sulfonic acid phosphonium salt represented by the following general formula (1), and
• the content of the antistatic agent is more than 2.0 parts by weight and not more than 10 parts by weight per 100 parts by weight of the polycarbonate resin used for the surface layer.
• R 1 represents an alkyl group, an aryl group or an alkyl group having an alkyl group as a substituent.
• R 2 to R 5 are a hydrogen atom, an alkyl group or an aryl group, and these may be the same or different.
• the light-diffusing polycarbonate resin plate of the present invention has excellent antistatic properties, light-diffusing properties, and brightness without impairing the transparency of the polycarbonate resin, and requires high optical performance. It is suitably used for light diffusion plates used in applications, particularly for backlights for liquid crystal display devices.
• the polycarbonate resin used for the substrate and the surface layer of the present invention comprises a phosgene method in which various dihydroxy diaryl compounds and phosgene are reacted, or a dihydroxy dianol compound and a carbonate such as diphenyl carbonate.
• a typical example of the polymer obtained by the transesterification process is a polycarbonate resin produced from 2,2_bis (4-hydroxyphenyl) propane (bisphenol A).
• the dihydroxy dialyl compound includes bis (4-hydroxyphenenole) methane, 1,1-bis (4-hydroxyphenenole) ethane, 2,2-bis (4 —Hydroxyphenyl 2-butane, 2,2-bis (4-hydroxyphenol) octane, bis (4-hydroxyphenyl) phenylmethane, 2,2bis (4-hydroxyphenyl-3-methylphenyl) Propane, 1,1-bis (4-hydroxy-1-3-tert-butylphenyl) propane, 2,2-bis (4-hydroxy-3-bromophenylene) propane, 2,2-bis (4-hydroxy-1-3,5 dibromophenol) ) Propane, bis (hydroxylinole) alkanes such as 2,2 bis (4 hydroxy-1,3,5 dichlorophenyl) propane, 1, 1 bis (4-hydroxyphenol) ) Cyclopentane, bis (hydroxyaryl) cycloalkanes such as 1,1-bis (4-hydroxyphenyl
• Trivalent or higher phenols include phlorognoresin, 4, 6-dimethyl-1,2,4,6-tri (4-hydroxyphenyl) heptene, 2,4,6-dimethyl-1,2,4,6-tri ( 4-Hydroxyphenyl) monoheptane, 1,3,5-tri (4-hydroxyphenyl) monobenzol, 1,1,1-tri (4-hydroxyphenyl) monoethane and 2,2-bis-one [4, 4— (4, 4′-dihydroxydiphenyl) monocyclohexyl] -propane and the like.
• the viscosity average molecular weight of the polycarbonate resin used for the surface layer or the base material is usually 1000 to 100000, preferably ⁇ is 15000 to 35000, and more preferably is 17000 to 28000.
• a molecular weight regulator, a catalyst and the like can be used as necessary.
• the light diffusing agent used in the present invention is not particularly limited in terms of chemical composition such as polymer and inorganic, but the light diffusing agent is added to the polycarbonate resin component of the present invention, and the resulting mixture is determined by an extruder.
• the light diffusing agent When dispersed by a known method such as melt mixing, it must be incompatible with the matrix phase or be present as particles that are hardly compatible.
• the light diffusing agent include calcium carbonate, silica, silicone, zinc sulfide, zinc oxide, titanium oxide, titanium phosphate, magnesium titanate, magnesium titanate, my strength, glass filler, barium sulfate, clay.
• Talc silicone rubber-like elastic body, inorganic diffusing agent such as polymethylsilsesoxane, acrylic, styrene, polyester, polyolefin, urethane, nylon, metatalylate styrene, fluorine, norbornene
• organic diffusing agents such as In particular, silica, silicone or acrylic is preferably used.
• the particle size of the light diffusing agent may be set to a desired light diffusion by adding the diffusing agent.
• the properties there is no particular limitation, but those having an average particle size of about 1 to 30 ⁇ m can be suitably used. If it is less than lzm, only light is transmitted, and a light diffusion effect may no longer be obtained. On the other hand, if it exceeds 30 xm, sufficient light diffusion effect cannot be obtained and visibility may be inferior.
• the particle size distribution is not particularly limited, but is about 0.:! To lOO xm, and more preferably 1.5 to 25 xm.
• two or more types of light diffusing agents with different average particle sizes, particle size distributions, and types may be used in combination. Particle size distributions are not uniform. It can also be used in combination.
• the blending amount of the light diffusing agent is preferably 0.1 to 10 parts by weight per 100 parts by weight of the polycarbonate resin of the base material. If the blending amount is less than 0.1 part by weight, a sufficient light diffusion effect may not be obtained. On the other hand, if it exceeds 10 parts by weight, the light transmission property is impaired, and sufficient light diffusion performance may not be obtained. More preferably, it is in the range of 0.3 to 5 parts by weight.
• the antistatic agent used in the present invention is a phosphonium salt of an organic sulfonic acid represented by the following general formula (1).
• R is an aryl group having an alkyl group, an aryl group or an alkyl group as a substituent, preferably an aryl group having an aryl group or an alkyl group as a substituent, more preferably an aryl having an alkyl group as a substituent. It is a group.
• the alkyl group and the alkyl group used as a substituent have 1 to 40 carbon atoms, preferably 8 to 18 carbon atoms.
• the number of alkyl groups that the aryl group has as a substituent is preferably 1 to 3, more preferably 1.
• examples of the aryl group include a phenyl group and a naphthyl group.
• R 2 to R 5 represent a hydrogen atom, an alkyl group or an aryl group, and these are the same. It can be different.
• the carbon number of the alkyl group is preferably 1 to 10:
• An aryl group includes a phenyl group.
• an alkylbenzene sulfonic acid phosphonium salt (S-418 manufactured by Takemoto Yushi Co.) represented by the following general formula (2) can be preferably used.
• the amount of the antistatic agent used in the surface layer of the present invention is more than 2 parts by weight and 10 parts by weight or less per 100 parts by weight of the polycarbonate resin in the surface layer. If the blending amount is 2 parts by weight or less, the antistatic property is inferior, and if it exceeds 10 parts by weight, the thermal stability is lowered, which is preferable. More preferably, it is in the range of 2. 2 to 5 parts by weight.
• the poly-force prolatatatone used in the present invention is a polymer produced by ring-opening polymerization of ⁇ -force prolatatatone in the presence of a catalyst, and 2-oxepanone homopolymer is particularly preferably used.
• the polymer is readily available as a commercial product, and a ton polymer manufactured by Dow Chemical Co., CAP ⁇ manufactured by Solvay Co., Ltd. and the like are used.
• the viscosity-average molecular weight of the poly-force prolataton is preferably from 10,000 to 100,000, and more preferably from 40000 to 900,000.
• poly force prolatatones may be modified in the presence of ⁇ -force prolatatatone by ring-opening polymerization in the presence of 1,4-butanediol or the like, or modified by replacing the molecular ends with ether or ester groups.
• Poly force prolatathon is also included.
• the blending amount of the poly-strength prolatatatone is 0.01 to 15 parts by weight per 100 parts by weight of the polycarbonate resin in the surface layer. A blending amount of less than 0.01 parts by weight is not preferable because a sufficient synergistic effect of antistatic properties cannot be obtained. On the other hand, when the amount exceeds 15 parts by weight, transparency is lowered, which is preferable. A more preferable composition ratio is 0.:! To 7 parts by weight. [0028] In the light diffusing polycarbonate resin plate of the present invention, various known additives, polymers, and the like may be applied to the substrate and the Z or surface layer as necessary depending on the performance required in addition to light diffusivity. , Can be added.
• a hindered amine type light-resistant stabilizer is added, and in order to obtain a more vivid color tone, a benzoxazole type fluorescent enhancement agent is used. You may add a white agent and these together.
• the light diffusing polycarbonate resin plate of the present invention has a known additive other than the above, for example, a phenol-based or phosphorus-based heat-stable homogeneous lj [2,6-di-tert-butyl-4-methylphenol, 2- (1-methylcyclohexane).
• the polycarbonate resin used for the light diffusing agent and the base material is weighed at an arbitrary blending amount and mixed together with a tumbler, ribbon blender, high-speed mixer, etc., and the mixture is then mixed with a normal single or twin screw extruder.
• the antistatic agent and the polycarbonate resin used for the surface layer can be weighed in arbitrary blending amounts, and the pellets for the surface layer can be obtained using the same method as described above.
• the resulting pellets for the substrate and surface layer are melted and kneaded by 2 to 3 uniaxial or twin screw extruders, respectively, and then supplied to the substrate feed block and surface layer feed block of the coextrusion die, respectively. And a laminated sheet is obtained.
• the raw materials used are as follows.
• Solvay CAPA6500C viscosity average molecular weight: 50000, hereinafter abbreviated as “PCL”) Kihiro Tsuyoshi 'I:
• LD 1 Polymethylsilsesxoxane-based diffusing agent
• LD-2 acrylic diffusing agent
• the obtained base material and surface layer pellets were each dried in advance at a drying condition of 125 ° C x 2 hours.
• the obtained co-extruded sheet was cut into 90 x 50 x 2 mm, conditioned for 24 hours at 23 ° C and 50% relative humidity, and then used with a superinsulator (SME-8311 manufactured by Sicid Electrostatic Co., Ltd.)
• the surface resistance was measured under the conditions of a measurement voltage of 500V and a sampling time of 60 seconds. The case where the surface specific resistance Rs was less than 1 ⁇ 10 14 was regarded as acceptable.
• the obtained co-extruded sheet was cut into 90 ⁇ 50 ⁇ 2 mm, and the half-life was measured using a Static Honest Meter 0-0110 manufactured by Sicid. First, apply a 10 KV charge until the withstand voltage of the specimen becomes constant. Thereafter, the charge was stopped and the decay of the charged voltage was observed, and the time until the initial charged voltage was halved was measured to obtain the half-life. A half-life of 10 seconds or less was accepted.
• Luminance is the ratio of luminosity in one direction per unit area in a plane perpendicular to that direction, and generally represents the brightness of the light emitting surface [unit: (cd / m 2 )].
• the lamp brightness measured value of 2500 cd / m 2 or more was passed ( ⁇ ), and the lamp brightness less than 2500 cd / m 2 was rejected (X).
• An outline of the measurement method is shown in Fig. 1.
• Comparative Example 3 is an example in which the light diffusing agent used in the base material of Comparative Example 1 was changed from LD-1 to LD-2, but the blending amount of the antistatic agent used for the surface layer material reached the specified amount. As a result, the surface resistivity and half-life were inferior.
• Comparative Example 4 is an example in which the light diffusing agent used in the base material of Comparative Example 2 was changed from LD-1 to LD-2, but the amount of antistatic agent used in the surface layer material exceeded the specified amount. As a result, the hue deteriorated and the target luminance could not be obtained.
• Comparative Example 5 shows the case where the compounding amount of poly-strength prolatatatone used for the surface layer material exceeds the specified amount, but the target brightness cannot be obtained due to the reduced transparency.
• FIG. 1 is a diagram showing a method for measuring inter-lamp luminance in the present invention.

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• Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Optics & Photonics (AREA)
• General Physics & Mathematics (AREA)
• Medicinal Chemistry (AREA)
• Organic Chemistry (AREA)
• Polymers & Plastics (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Dispersion Chemistry (AREA)
• Optical Elements Other Than Lenses (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Laminated Bodies (AREA)
• Liquid Crystal (AREA)

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• 2006
  • 2006-07-24 JP JP2006200231A patent/JP2008023881A/ja active Pending
  • 2006-11-17 EP EP20060832834 patent/EP2045294A1/en not_active Withdrawn
  • 2006-11-17 CA CA 2657029 patent/CA2657029A1/en not_active Abandoned
  • 2006-11-17 US US12/306,214 patent/US20090233100A1/en not_active Abandoned
  • 2006-11-17 CN CNA2006800550965A patent/CN101472992A/zh active Pending
  • 2006-11-17 RU RU2009106064/05A patent/RU2009106064A/ru not_active Application Discontinuation
  • 2006-11-17 WO PCT/JP2006/322955 patent/WO2008012929A1/ja not_active Ceased
  • 2006-11-17 BR BRPI0621780-0A patent/BRPI0621780A2/pt not_active IP Right Cessation
  • 2006-11-17 KR KR1020097001502A patent/KR20090050047A/ko not_active Ceased
  • 2006-11-27 TW TW95143726A patent/TW200806728A/zh not_active IP Right Cessation
• 2009
  • 2009-01-06 NO NO20090055A patent/NO20090055L/no not_active Application Discontinuation

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