EP1660935A1 - Diffuseur pour applications lcd, procede de production correspondant et utilisation - Google Patents

Diffuseur pour applications lcd, procede de production correspondant et utilisation

Info

Publication number
EP1660935A1
EP1660935A1 EP04732288A EP04732288A EP1660935A1 EP 1660935 A1 EP1660935 A1 EP 1660935A1 EP 04732288 A EP04732288 A EP 04732288A EP 04732288 A EP04732288 A EP 04732288A EP 1660935 A1 EP1660935 A1 EP 1660935A1
Authority
EP
European Patent Office
Prior art keywords
particles
scattering
weight
range
polymethyl methacrylate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP04732288A
Other languages
German (de)
English (en)
Inventor
Markus Parusel
Jann Schmidt
Herbert Groothues
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Roehm GmbH Darmstadt
Original Assignee
Roehm GmbH Darmstadt
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Roehm GmbH Darmstadt filed Critical Roehm GmbH Darmstadt
Publication of EP1660935A1 publication Critical patent/EP1660935A1/fr
Ceased legal-status Critical Current

Links

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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/10—Homopolymers or copolymers of methacrylic acid esters
    • C08L33/12—Homopolymers or copolymers of methyl methacrylate
    • 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
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0221—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having an irregular structure
    • 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
    • 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
    • G02B5/0294—Diffusing elements; Afocal elements characterized by the use adapted to provide an additional optical effect, e.g. anti-reflection or filter
    • 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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • G03B21/62—Translucent screens
    • 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
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • 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
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/254—Polymeric or resinous material
    • 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
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/258—Alkali metal or alkaline earth metal or compound thereof
    • 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]
    • Y10T428/31855—Of addition polymer from unsaturated monomers

Definitions

  • the present invention relates to lenses for LCD applications comprising at least one light-scattering polymethyl methacrylate layer, process for producing these lenses and use.
  • LCDs Liquid Crystal Displays
  • LCDs are often used as a display medium on computers. Recently, this technology has also been offered in television sets. In addition, LCDs are also used for the graphic display of navigation data in automobiles, aircraft and ships. The requirements for these monitors are correspondingly diverse. Many LCDs have one lighting unit in common, which is attached behind the actual LCD cell with the polarizing foils. Diffusers are often used between the lighting unit and the LCD cell, which distributes the light necessary for the display evenly over the LCD cell.
  • Disks suitable for this purpose which comprise mixtures of particles, are known per se.
  • JP 4-134440 describes rear projection screens which comprise particles with different refractive indices. As a result, the color tone is reproduced better.
  • JP 8-198976, JP 5-51480 and JP 2000-296580 describe such panes which can be used for lighting applications.
  • the plates mentioned above, which have scattering media, can in principle be used as a scattering disc.
  • known plates do not show a balanced property profile.
  • the brightness distribution achieved by known plates equipped with scattering media is often not optimal.
  • the optical properties, such as scattering power or intensity half-value angle or yellowness index, of many known impact-modified scattering plates have a temperature dependency.
  • the temperature dependency may be negligible in some applications.
  • the dashboards of automobiles are subject to strong temperature fluctuations. Among other things, measurable inhomogeneities occur at high temperatures. Despite these strong fluctuations, the spreading disc should ensure that the properties are as constant as possible.
  • the spreading discs should allow a high light yield with a very high scattering effect.
  • the lenses should allow a particularly neutral scattered light without color shift.
  • the colors generated by the LCD cells should only change slightly due to temperature fluctuations.
  • Another object of the present invention was to provide diffusing screens for LCD applications which have a particularly uniform brightness distribution.
  • the spreading discs should have the highest possible mechanical stability. Scratches on the plastic plate should not be visible or only slightly. In particular, damage should have little or no influence on the brightness distribution of the monitor provided with a lens.
  • the invention was based on the object of providing diffusers for LCD applications which can be produced particularly easily.
  • the spreading disks should be able to be produced in particular by extrusion.
  • Another object of the present invention was to provide diffusers which are simple in size and shape Requirements can be adjusted.
  • the spreading disks should be able to be processed using very cost-effective methods, for example using laser cutting systems.
  • Another object of the invention was that the lenses have a high durability, in particular a high resistance to UV radiation or weathering.
  • claim 24 provides a solution to the underlying problem.
  • diffusing screens for LCD applications to comprise at least one light-scattering polymethyl methacrylate layer, a polymethyl methacrylate matrix and 0.5% by weight to 59.5% by weight, based on the weight of the light-scattering polymethyl methacrylate layer, of spherical scattering particles (A) which have an average particle size V 50 in the range from 0.1 to 40 ⁇ m and a refractive index difference to the polymethyl methacrylate matrix in the range from 0.02 to 0.2, and 0.5% by weight to 59.5 %
  • the lenses of the present invention can be adapted to individual needs without the brightness distribution and / or the sensitivity to scratching being impaired as a result.
  • the spreading discs of the present invention allow high transmission and good spreading power.
  • the display on the lenses according to the invention enables LCDs that provide particularly true color images.
  • the spreading disks made available according to the present invention have a particularly uniform brightness distribution.
  • the lenses of the present invention show high mechanical stability. In this case, scratches, which may be present on the pane, have no or only a slight effect on the image generated by the LCD cell.
  • the lenses of the present invention can also be used in LCDs which are exposed to a particularly high temperature fluctuation. Here, these temperature fluctuations have only a minor effect on the brightness distribution, the transmission or the scattering power of the lenses.
  • the lenses of the present invention can be manufactured particularly easily.
  • the spreading disks can be produced in particular by extrusion.
  • the spreading discs according to the invention show a high resistance to weathering, in particular to UV radiation.
  • the size and shape of the spreading discs can be adapted to the needs.
  • the light-scattering polymethyl methacrylate layer of the lens according to the present invention has 1 to 60% by weight, in particular 3 to 55% by weight and preferably 6 to 48% by weight, based on the weight of the light-scattering polymethyl methacrylate layer, of spherical scattering particles (A) and spherical particles (B).
  • the scattering particles (A) and the particles (B) are spherical.
  • the term spherical denotes that the particles preferably have a spherical shape, it being obvious to the person skilled in the art that, due to the production methods, particles with a different shape may also be present, or that the shape of the particles may deviate from the ideal spherical shape , Accordingly, the term spherical means that the ratio of the largest dimension of the particles to the smallest dimension is a maximum of 4, preferably a maximum of 2, these dimensions being measured in each case by the center of gravity of the particles. At least 70, particularly preferably at least 90%, based on the number of particles, is preferably spherical.
  • the scattering particles (A) have an average particle size V 50 in the range from 0.1 to 40 ⁇ m, in particular from 0.5 to 30 ⁇ m and particularly preferably 1 to 15 ⁇ m.
  • the light-scattering PMMA layer comprises 0.5 to 59.5% by weight, preferably 1 to 20% by weight and particularly preferably 1.5 to 10% by weight, based on the weight of the light-scattering polymethyl methacrylate layer, spherical Scattering particles (A).
  • Such particles are known per se and can be obtained commercially. These include in particular plastic particles as well as particles that comprise inorganic materials.
  • the scattering particles which can be used according to the invention are not particularly restricted, the light refraction taking place at the phase boundary of the scattering particles (A) with the matrix plastic.
  • the refractive index of the scattering particles (A) has a refractive index n 0 measured at the Na-D line (589 nm) and at 20 ° C., which differs from the refractive index n 0 of the matrix plastic by 0.02 to 0.2 units ,
  • the spherical scattering particles (A) preferably comprise crosslinked polystyrene, polysilicon and / or crosslinked poly (meth) acrylates.
  • a group of preferred plastic particles that are used as scattering agents contain silicones. Such particles are obtained, for example, by hydrolysis and polycondensation of organotrialkoxysilanes and / or tetraalkoxysilanes, which have the formulas
  • R 1 represents, for example, a substituted or unsubstituted alkyl group, an alkenyl group or a phenyl group
  • R 2 of the hydrolyzable alkoxy group represents an alkyl group such as methyl, ethyl or butyl or an alkoxy-substituted hydrocarbon group such as 2-methoxyethyl or 2 Represents ethoxyethyl.
  • Exemplary organotrialkoxysilanes are methyltrimethoxysilane, methyltriethoxysilane, methyl-n-propoxysilane, methyltriisopropoxysilane and methyltris (2-methoxyethoxy) silane.
  • Spreading agents made of silicone that are particularly preferably used in the present invention are available from GE Bayer Silicones under the trade names TOSPEARL® 120 and TOSPEARL® 3120.
  • Another group of preferred plastic particles are composed of: b1) 25 to 99.9 parts by weight of monomers which have aromatic groups as substituents, such as styrene, methylstyrene, ring-substituted styrenes, phenyl (meth) acrylate, benzyl (meth) acrylate, 2-phenylethyl (meth) acrylate, 3-phenylpropyl (meth) acrylate or vinyl benzoate; and b2) 0 to 60 parts by weight of an acrylic and / or methacrylic acid ester having 1 to 12 carbon atoms in the aliphatic ester residue, which with the Monomers b1) can be copolymerized, examples being: methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, i-propyl (meth) acrylate, n-butyl (meth) acrylate, i-
  • Mixtures from which the plastic particles are produced particularly preferably have at least 80% by weight of styrene and at least 0.5% by weight of divinylbenzene.
  • the scattering particles can be produced by emulsion polymerization, as described, for example, in EP-A 342 283 or EP-A 269 324, very particularly preferably by polymerization in the organic phase, as described, for example, in German patent application P 43 27 464.1, with the latter Polymerization technology particularly narrow particle size distributions or, in other words, particularly small deviations of the particle diameter from the average particle diameter occur.
  • Plastic particles are particularly preferably used which have a temperature resistance of at least 200 ° C., in particular of Have at least 250 ° C, without this being intended to be a limitation.
  • temperature-resistant means that the particles are essentially not subject to thermal degradation. Thermal degradation undesirably leads to discoloration, making the plastic material unusable.
  • Particularly preferred particles are available from Sekisui, among others, under the trade names ⁇ Techpolymer SBX-6, ®Techpolymer SBX-8 and ® Techpolymer SBX-12.
  • the inorganic materials from which the scattering particles (A) can also be produced include aluminum hydroxide, aluminum-potassium silicate (mica), aluminum silicate (kaolin), barium sulfate (BaSO 4 ), calcium carbonate, magnesium silicate (talc). Of these materials, BaSO 4 is preferred.
  • particles comprising inorganic materials are preferred.
  • the previously described scattering particles (A) can be used individually or as a mixture of two or more types.
  • the light-scattering PMMA layer comprises 0.5 to 59.5% by weight, preferably 5 to 40% by weight and particularly preferably 8 to 25% by weight, based on the weight of the light-scattering polymethyl methacrylate layer, spherical particles ( B).
  • the particles (B) to be used according to the invention have an average particle size V 50 in the range from 10 to 150 ⁇ m, preferably 15 to 70 ⁇ m and particularly preferably 30 to 50 ⁇ m, the refractive index of the particles being one of the sodium D line (589 nm ) and measured at 20 ° C
  • Have refractive index n 0 which differs by 0 to 0.2 units from the refractive index n 0 of the matrix carbon.
  • the particles (B) can also be obtained commercially. These particles can be made from the same materials as the scattering particles (A). Plastic particles are preferably used here.
  • the spherical particles (B) preferably comprise crosslinked polystyrene, polysilicon and / or crosslinked poly (meth) acrylates.
  • the particles (B) described above can be used individually or as a mixture of two or more types.
  • the ratio of the weight average of the scattering particles (A) to the particles (B) is in the range from 1: 00 to 10: 1, in particular 1:50 to 7.5: 1, particularly preferably 1:25 to 5: 1 and entirely particularly preferably 1:10 to 3: 1.
  • the difference between the mean particle size V 50 of the scattering particles (A) and the particles (B) is preferably at least 5 ⁇ m, in particular at least 10 ⁇ m, the particles (B) being larger than the scattering particles (A).
  • the particle size and the particle size distribution can be determined using a laser extinction method.
  • a Galay-CIS from L.O.T. GmbH are used, the measurement method for determining the particle size and the particle size distribution is contained in the user manual.
  • the particle size of inorganic particles can be determined by means of an X-ray graph.
  • a MICROSCAN Il device from Quantachrome can be used.
  • the MICROSCAN II is an automatic measuring device for determining the particle size distribution of powders in suspensions with a measuring range from 0.1 to 300 ⁇ m.
  • the measuring principle of the MICROSCAN II is sedimentation with X-ray detection.
  • the particles are dispersed homogeneously in a liquid with the help of a built-in hose pump or ultrasonic treatment.
  • the particle size determination is determined according to Stokes' law depending on the density of particles and dispersing liquid, the viscosity of the liquid and the sinking speed of the particles
  • the average particle size of V 50 results from the median of the weight average, 50% by weight of the particles being less than or equal to and 50% by weight of these particles being greater than or equal to this value.
  • these particles are present in the plastic matrix in a uniformly distributed manner without any significant aggregation or aggregation of the particles occurring. Evenly distributed means that the concentration of particles within the plastic matrix is essentially constant.
  • the light-scattering layer comprises a plastic matrix which has polymethyl methacrylate (PMMA).
  • PMMA polymethyl methacrylate
  • the light-scattering polymethyl methacrylate layer preferably comprises at least 30% by weight, in particular at least 40% by weight and particularly preferably at least 50% by weight, based on the weight of the light-scattering layer, of polymethyl methacrylate.
  • Polymethyl methacrylates are generally obtained by radical polymerization of mixtures containing methyl methacrylate.
  • these mixtures contain at least 40% by weight, preferably at least 60% by weight and particularly preferably I o
  • these mixtures for the production of polymethyl methacrylates can contain further (meth) acrylates which can be copolymerized with methyl methacrylate.
  • the term (meth) acrylates encompasses methacrylates and acrylates and mixtures of the two.
  • (Meth) acrylates derived from saturated alcohols, such as, for example, methyl acrylate, ethyl! (Meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, tert-butyl (meth) acrylate, pentyl (meth) acrylate and
  • Aryl (meth) acrylates such as benzyl (meth) acrylate or
  • Phenyl (meth) acrylate where the aryl radicals can in each case be unsubstituted or substituted up to four times;
  • Cycloalkyl (meth) acrylates such as 3-vinylcyclohexyl (meth) acrylate,
  • Glycol di (meth) acrylates such as 1,4-butanediol (meth) acrylate,
  • Trimethyloylpropantri (meth) acrylate Trimethyloylpropantri (meth) acrylate.
  • compositions to be polymerized can also have further unsaturated monomers which are copolymerizable with methyl methacrylate and the aforementioned (meth) acrylates.
  • 1-alkenes such as 1-hexene, 1-heptene
  • branched alkenes such as vinylcyclohexane, 3,3-dimethyl-1-propene, 3-methyl-1-diisobutylene, 4-methylpentene-1;
  • Styrene substituted styrenes with an alkyl substituent in the side chain, such as. B. ⁇ -methylstyrene and ⁇ -ethylstyrene, substituted styrenes with an alkyl substituent on the ring, such as vinyltoluene and p-methylstyrene, halogenated styrenes such as monochlorostyrenes, dichlorostyrenes, tribromostyrenes and tetrabromostyrenes;
  • Heterocyclic vinyl compounds such as 2-vinylpyridine, 3-vinylpyridine, 2-methyl-5-vinylpyridine, 3-ethyl-4-vinylpyridine, 2,3-dimethyl-5-vinylpyridine, vinylpyrimidine, vinylpiperidine, 9-vinylcarbazole, 3-vinylcarbazole, 4-vinylcarbazole, 1-vinylimidazole, 2-methyl-1-vinylimidazole, N-vinylpyrrolidone, 2-vinylpyrrolidone, N-vinylpyrrolidine, 3-vinylpyrrolidine, N-vinylcaprolactam, N-vinylbutyrolactam, vinyloxolane, vinylfuran, vinylthiophene, vinylthiophene, vinylthiolthene hydrogenated vinyl thiazoles, vinyl oxazoles and hydrogenated vinyl oxazoles; Vinyl and isoprenyl ether;
  • Maleic acid derivatives such as maleic anhydride, methyl maleic anhydride, maleimide, methyl maleimide; and dienes such as divinylbenzene.
  • these comonomers are used in an amount of 0 to 60% by weight, preferably 0 to 40% by weight and particularly preferably 0 to 20% by weight, based on the weight of the monomers, the compounds being used individually or can be used as a mixture.
  • the polymerization is generally started with known radical initiators.
  • the preferred initiators include, among others, the azo initiators well known in the art, such as AIBN and 1, 1-azobiscyclohexane carbonitrile, and also peroxy compounds, such as methyl ethyl ketone peroxide, acetylacetone peroxide, dilauryl peroxide, tert-butyl per-2-ethylhexanoate, ketone peroxide, methyl isobutyl ketone peroxide, and cyclohexyl peroxide , tert-butyl peroxybenzoate, tert-butyl peroxyisopropyl carbonate, 2,5-bis (2-ethylhexanoyl-peroxy) -2,5-dimethylhexane, tert-butyl peroxy-2-ethylhexanoate, tert-butyl peroxy-3,5,5- trimethylhexanoate
  • These compounds are often used in an amount of from 0.01 to 10% by weight, preferably from 0.5 to 3% by weight, based on the weight of the monomers.
  • poly (meth) acrylates can be used here, which differ, for example, in molecular weight or in the monomer composition.
  • the matrix of the light-scattering layer can contain further polymers in order to modify the properties. These include polyacrylonitriles, polystyrenes, polyethers, polyesters, polycarbonates and polyvinyl chlorides. These polymers can be used individually or as a mixture, copolymers also being derivable from the aforementioned polymers.
  • the weight average molecular weight M w of the homopolymers and / or copolymers to be used according to the invention as matrix polymers can vary within wide limits, the molecular weight usually being matched to the intended use and the processing mode of the molding composition. In general, however, it is in the range between 20,000 and 1,000,000 g / mol, preferably 50,000 to 500,000 g / mol and particularly preferably 80,000 to 300,000 g / mol, without any intention that this should impose a restriction.
  • the matrix of the light-scattering polymethyl methacrylate layer has at least 70, preferably at least 80 and particularly preferably at least 90% by weight, based on the weight of the matrix of the light-scattering layer, of polymethyl methacrylate.
  • the poly (meth) acrylates of the matrix of the light-scattering layer have a refractive index measured at the Na-D line (589 nm) and at 20 ° C. in the range from 1.46 to 1.54.
  • the molding compositions for producing the light-scattering layer can contain customary additives of all kinds. These include, among others, antistatic agents, antioxidants, mold release agents, flame retardants, lubricants, dyes, flow improvers, fillers, light stabilizers, UV absorbers and organic phosphorus compounds such as phosphites or phosphonates, pigments, weathering protection agents and plasticizers.
  • additives include, among others, antistatic agents, antioxidants, mold release agents, flame retardants, lubricants, dyes, flow improvers, fillers, light stabilizers, UV absorbers and organic phosphorus compounds such as phosphites or phosphonates, pigments, weathering protection agents and plasticizers.
  • additives include, among others, antistatic agents, antioxidants, mold release agents, flame retardants, lubricants, dyes, flow improvers, fillers, light stabilizers, UV absorbers and organic phosphorus compounds such as phosphites or phosphonates, pigments, weathering protection agents and
  • the lens should only contain a small amount of impact modifier, which are described, for example, in EP-A 0 113 924, EP-A 0 522 351, EP-A 0 465049 and EP-A 0 683 028.
  • the content of impact modifier in the lenses is limited to a maximum of 20% by weight, preferably 10% by weight and particularly preferably 4% by weight.
  • diffusing disks of the present invention particularly preferably do not comprise any impact modifiers.
  • Particularly preferred molding compositions for the production of the plastic matrix are commercially available from Röhm GmbH & Co. KG.
  • the thickness of the light-scattering polymethyl methacrylate layer is generally in the range from 1 to 100 mm, preferably in the range from 1 to 10 mm and particularly preferably in the range from 2 to 5 mm.
  • the concentration of the spherical scattering particles (A) C PA , the thickness of the light-scattering polymethyl methacrylate layer d s and the particle size of the spherical scattering particles (A) D PA are chosen such that the ratio of the product of concentration the spherical scattering particle (A) c PA and the thickness of the light-scattering polymethyl methacrylate layer to the third power of the particle size of the spherical scattering particle (A) CpA * ds / Dp A 3 preferably in the range from 0.0001 to 0.5% by weight * mm / ⁇ m 3 , in particular 0.0025 to 0.3% by weight * mm / ⁇ m 3 .
  • plastics particles are o used with a particle size of V 5 in the range 6 to 30 microns as the scattering media, then there is the relationship of the product of concentration of the spherical scattering particles (A) c PA and thickness of the light-scattering polymethyl methacrylate layer to the cube of particle size the spherical scattering particle (A) c PA * ds / D PA 3 according to a particular aspect of the present invention preferably in the range from 0.0015 to 0.09% by weight * mm / ⁇ m 3 , particularly preferably 0.0025 to 0, 06% by weight * mm / ⁇ m 3 and very particularly preferably in the range from 0.005 to 0.04% by weight * mm / ⁇ m 3 .
  • the concentration of the spherical particles (B) O B , the thickness of the light-scattering polymethyl methacrylate layer d s and the particle size of the spherical particles (B) D PB can be chosen such that the ratio of the product of the concentration of the spherical scattering particles (B) C PB and thickness of the light-scattering polymethyl methacrylate layer to the third power of the particle size of the spherical scattering particles
  • (B) Cp B * ds / D PB 3 preferably in the range from 0.000005 to 0.04% by weight * mm / ⁇ m 3 , in particular 0.00005 to 0.02% by weight * mm / ⁇ m 3 % by weight .-% * mm / ⁇ m 3 .
  • the ratio of the square of the average surface roughness of the polymethyl methacrylate layer Rz to the third power of the particle size of the spherical particles (B) R Z 2 / D PB 3 can preferably be in the range from 0.0002 ⁇ nr ⁇ 1 to 0.1300 ⁇ m "1 , preferably 0.0009 ⁇ m “ 1 to 0.0900 ⁇ m "1 , in particular 0.0006 ⁇ m “ 1 to 0.0800 ⁇ m "1 and preferably 0.0008 ⁇ m " 1 up to 0.0400 ⁇ m "1 .
  • the ratio of the concentration of the spherical scattering particles (A) C PA to the thickness of the light-scattering polymethyl methacrylate layer ds C PA ⁇ J S is in the range from 0.2% by weight / mm to 20% by weight. % / mm, in particular from 0.5% by weight / mm to 10% by weight / mm.
  • the ratio of the concentration of the spherical particles (B) C PB to the thickness of the light-scattering polymethyl methacrylate layer d s cpß / ds is greater than or equal to 2.5% by weight / mm, in particular greater than or equal 4 wt% / mm.
  • the ratio of the thickness of the light-scattering polymethyl methacrylate layer ds and the particle size of the spherical scattering particles DP A s / Dp A is preferably in the range from 5 to 1500, in particular 10 to 1000 and particularly preferably 100 to 600, without any intention that this should impose a restriction.
  • the light-scattering polymethyl methacrylate layer preferably has a gloss R ⁇ 5 ° of less than or equal to 60, in particular less than or equal to 40 and particularly preferably less than 30.
  • the lenses of the present invention in particular the light-scattering polymethyl methacrylate layer, have a particularly low sensitivity to scratching.
  • a particular aspect of the present invention are scratches with a force of at most 0.4 N, in particular of at most 0.7 N and particularly preferably of at most 1.0 N are generated on the disk, not visually recognizable, without this being intended to impose a restriction.
  • This scratch resistance can be determined in accordance with DIN 53799 and DIN EN 438 by a visual assessment of a damaged surface, the damage being caused by a diamond that acts on the surface with different forces.
  • the average surface roughness R z of the plate is preferably in the range from 5 ⁇ m to 50 ⁇ m, in particular 5 to 25 ⁇ m, preferably 6 to 35 ⁇ m and particularly preferably 6 ⁇ m to 30 ⁇ m.
  • the average surface roughness Rz can be determined in accordance with DIN 4768 using a Talysurf 50 measuring device from Taylor Hobson, where Rz is the average roughness depth that results from the mean values of the individual roughness depths of five successive individual measuring sections in the roughness profile.
  • the surface roughness R z of the plate generally results from the choice of the particles (B).
  • this value can be influenced by varying various parameters, which depend on the type of manufacture.
  • the temperature of the melt depends on the exact composition of the molding compound.
  • the temperature of the melt is generally in the range from 150 to 300 ° C., preferably in the range from 200 to 290 ° C. This Temperatures refer to the temperatures of the melt at the nozzle outlet.
  • the surface roughness can be influenced via the gap between the rollers used to smooth the plates.
  • a calender comprises, for example, 3 rolls in an L arrangement, the molding compound being guided from the nozzle onto the nip between roll 1 and roll 2 and looping around the roll 2 by 60-180 °, the gap between roll 2 and roll 3 smoothes the surfaces. If the gap between roller 2 and roller 3 is set to plate thickness, the scattering particles on the plate surface are pressed into the matrix, as a result of which the surface is smoother.
  • this gap is set somewhat larger than the plate thickness of the plate to be produced in order to achieve a rougher surface, this value often being in the range from 0.1 to 2 mm above plate thickness, preferably 0.1 to 1.5 mm above plate thickness, without that this should result in a restriction.
  • the surface roughness is influenced by the particle size and the plate thickness, the exemplary embodiments setting out the dependencies.
  • the light-scattering layer can be produced by known processes, thermoplastic molding processes being preferred. After the addition of the particles, light-scattering layers can be produced from the molding compositions described above by conventional thermoplastic molding processes.
  • a twin-screw extruder is used for the extrusion or for the production of molding compound granules containing scattering pearls.
  • the plastic particles are preferably transferred to the melt in the extruder.
  • the spreading disks can be produced in a two-stage process, in which a sidefeeder compounding according to the invention on a twin-screw extruder and intermediate granulation is followed by extrusion of the film or plate on a single-screw extruder.
  • the granules obtained via the twin-screw extruder can contain particularly high proportions of scattering pearls, so that by mixing with molding compositions without scattering pearls, scattering discs with different scattering pearls content can be produced in a simple manner.
  • a one-step process can also be carried out, in which the spherical plastic particles are compounded into the melt as described on a twin-screw extruder, which may be followed by a pressure-increasing unit (e.g. melt pump), to which the extrusion nozzle is directly connected, with which a flat product is formed.
  • a pressure-increasing unit e.g. melt pump
  • Spreading disks with a particularly low yellow index can surprisingly be obtained by the measures described above.
  • the spreading disks can also be produced by injection molding, but the process parameters or the mold must be selected such that a surface roughness is achieved in the area according to the invention.
  • the matrix is preferably compounded with the scattering particles by means of a twin-screw extruder; a single-screw extruder can also be used in the actual plate extrusion, without any intention that this should impose a restriction.
  • the lens of the present invention has a transmission in the range from 30% to 70%, in particular in the range from 40% to 70% and particularly preferably in the range from 40 to 65%.
  • the lens preferably shows a yellowness index of less than or equal to 12, in particular less than or equal to 10, without this being intended to impose a restriction.
  • a special embodiment of the lens of the present invention has an intensity half-value angle greater than or equal to 15 °, in particular greater than or equal to 25 °.
  • the spreading disc of the present invention has a scattering power greater than or equal to 0.3, in particular greater than or equal to 0.45 and particularly preferably greater than or equal to 0.6.
  • the surface of the lenses according to the invention have a matt appearance in reflection.
  • the characterization can be carried out by measuring the gloss with a reflectometer according to DIN 67530.
  • the gloss of the plates is preferably at an angle of 85 ° below 60, particularly preferably below 40 and very particularly preferably below 30.
  • the size and shape of the lenses of the present invention are not limited. In general, however, the lens has a rectangular, tabular shape, since LCDs usually have such a format.
  • the lens has a particularly high weather resistance according to DIN EN ISO 4892, part 2 - Artificially proven or irradiated in devices, filtered xenon arc radiation.
  • the lenses according to the invention are generally very resistant to weathering.
  • the weather resistance according to DIN 53387 (Xenotest) of preferred spreading disks is at least 5000 hours.
  • the molded body preferably has an elastic modulus according to ISO 527-2 of at least 1500 MPa, in particular at least 2000 MPa, without this being intended to impose a restriction.
  • preferred spreading disks have a continuous use temperature of at least 60 ° C., in particular at least 70 °.
  • the continuous use temperature results in particular from the materials from which the lenses were made.
  • the continuous use temperature characterizes the temperature at which the lenses show no deformation even after several hours.
  • these panes preferably have a low thermal expansion, so that by heating them to at least 20 ° C., in particular at least 40 ° C., they experience an elongation of at most 0.55%, in particular at most 0.3%.
  • the diffusing screens according to the invention can be used for other lighting applications, for example as rear projection screens.
  • the invention is explained in more detail below by means of examples and comparative examples, without the invention being restricted to these examples.
  • the average roughness R z was determined in accordance with DIN 4768 using a Talysurf 50 measuring device from Taylor Hobson.
  • the transmission ⁇ o65 / 2 ° was determined in accordance with DIN 5036 using a Lambda 19 measuring device from Perkin Elmer.
  • the yellowness index X D65 / IO O was determined in accordance with DIN 6167 using a Lambda 19 measuring device from Perkin Elmer.
  • the gloss R85 ° was measured at 85 ° according to DIN 67530 with a Dr. Long laboratory reflectometer from Dr. For a long time.
  • the scattering power and the intensity half-value angle were determined in accordance with DIN 5036 using an LMT goniometer measuring station GO-T-1500 from LMT.
  • An aluminum hydroxide Pickering stabilizer was used to produce spherical plastic particles, which was prepared by precipitation from aluminum sulfate and soda solution immediately before the actual polymerization started.
  • 16 g of Al 2 (SO 4 ) 3 , 0.032 g of complexing agent (Trilon A) and 0.16 g of emulsifier were initially used (Emulsifier K 30 available from Bayer AG; sodium salt of a C 15 paraffin sulfonate) dissolved in 0.81 distilled water.
  • Emulsifier K 30 available from Bayer AG; sodium salt of a C 15 paraffin sulfonate
  • a 1N sodium carbonate solution was then added to the aluminum sulfate dissolved in water with stirring at a temperature of about 40 ° C., the pH then being in the range from 5 to 5.5. This procedure resulted in a colloidal distribution of the stabilizer in the water.
  • the aqueous phase was transferred to a beaker. 110 g of methyl methacrylate, 80 g of benzyl methacrylate and 10 g of allyl methacrylate, 4 g of dilauryl peroxide and 0.4 g of tert-butyl per-2-ethylhexanoate were added. This mixture was dispersed for 15 minutes at 7000 rpm using a disperser (Ultra-Turrax S50N-G45MF, from Janke and Kunkel, Stauten).
  • the reaction mixture was poured into the reactor, which was preheated to the appropriate reaction temperature of 80 ° C., and polymerized at about 80 ° C. (polymerization temperature) for 45 minutes (polymerization time) with stirring (600 rpm). This was followed by a post-reaction phase of 1 hour at an internal temperature of approx. 85 ° C. After cooling to 45 ° C., the stabilizer was converted into water-soluble aluminum sulfate by adding 50% sulfuric acid. To work up the beads, the suspension obtained was filtered through a commercially available filter cloth and dried in a heating cabinet at 50 ° C. for 24 hours.
  • the size distribution was examined by laser extinction methods.
  • the particles had an average size V50 of 18.6 ⁇ m.
  • the beads had a spherical shape, with no fibers being found. Coagulation did not occur.
  • the particles obtained in this way are referred to below as plastic particles B1 Plastic particles B2)
  • Plastic particles according to DE 3528165 C2 were produced, the particles having essentially the same composition as the plastic particles B1) set out above.
  • the size distribution was examined by laser extinction methods.
  • the particles had an average size V 50 of 40.5 ⁇ m.
  • the beads had a spherical shape, with no fibers being found. Coagulation did not occur.
  • the particles obtained in this way are referred to below as plastic particles B2

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Nonlinear Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

L'invention concerne des diffuseurs pour applications LCD, comprenant au moins une couche de polyméthylméthacrylate de diffusion de la lumière, présentant une matrice de polyméthylméthacrylate, ainsi que 0,5 à 59,5 % en poids par rapport au poids de la couche de polyméthylméthacrylate de diffusion de la lumière, des particules sphériques de diffusion (A), présentant une grandeur particulaire moyenne V50 de l'ordre de 0,1 à 40 νm et une différence d'indice de réfraction par rapport à la matrice de polyméthylméthacrylate de l'ordre de 0,02 à 0,2, et entre 0,5 et 59,5 % en poids, par rapport au poids de la couche de polyméthylméthacrylate de diffusion de la lumière, de particules sphériques (B), présentant une grandeur particulaire moyenne V50 de l'ordre de 10 à 150 νm et une différence d'indice de réfraction par rapport à la matrice de polyméthylméthacrylate de l'ordre de 0 à 0,2, la concentration globale des particules sphériques de diffusion (A) et des particules (B) se situant entre 1 et 60 % en poids, par rapport au poids de la couche de polyméthylméthacrylate de diffusion de la lumière. Les particules sphériques de diffusion (A) et les particules sphériques (B) présentent une grandeur particulaire moyenne V50 différente. Les diffuseurs présentent une transmission de l'ordre de 20 à 70 % et un pouvoir de diffusion supérieur à 0,3. Le rapport du carré de la rugosité superficielle moyenne de la couche de polyméthylméthacrylate Rz à la puissance 3 de la grandeur particulaire des particules sphériques (B) Rz2/DPB3 est de l'ordre de 0,0002 νm-1 à 0,1300 νm-1.
EP04732288A 2003-08-04 2004-05-12 Diffuseur pour applications lcd, procede de production correspondant et utilisation Ceased EP1660935A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003136130 DE10336130A1 (de) 2003-08-04 2003-08-04 Streuscheibe für LCD-Anwendungen, Verfahren zu deren Herstellung und Verwendung
PCT/EP2004/005058 WO2005022245A1 (fr) 2003-08-04 2004-05-12 Diffuseur pour applications lcd, procede de production correspondant et utilisation

Publications (1)

Publication Number Publication Date
EP1660935A1 true EP1660935A1 (fr) 2006-05-31

Family

ID=34089113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04732288A Ceased EP1660935A1 (fr) 2003-08-04 2004-05-12 Diffuseur pour applications lcd, procede de production correspondant et utilisation

Country Status (16)

Country Link
US (1) US7629041B2 (fr)
EP (1) EP1660935A1 (fr)
JP (1) JP2007501425A (fr)
KR (1) KR20060056365A (fr)
CN (1) CN100541283C (fr)
AU (1) AU2004269463B2 (fr)
BR (1) BRPI0413302A (fr)
CA (1) CA2534538A1 (fr)
DE (1) DE10336130A1 (fr)
HK (1) HK1094044A1 (fr)
MX (1) MXPA06001067A (fr)
NZ (1) NZ545549A (fr)
RU (1) RU2359298C2 (fr)
TW (1) TW200523645A (fr)
WO (1) WO2005022245A1 (fr)
ZA (1) ZA200601021B (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10336129A1 (de) 2003-08-04 2005-02-24 Röhm GmbH & Co. KG Kratzunempfindlicher Rückprojektionsschirm und Verfahren zu dessen Herstellung
DE102005021335A1 (de) * 2005-05-04 2006-11-09 Röhm Gmbh Verfahren zur Herstellung von Perlpolymerisaten mit einer mittleren Teilchengröße im Bereich von 1 µm bis 40 µm sowie Perlpolymerisat aufweisende Formmassen und Formkörper
DE102005050072A1 (de) * 2005-10-19 2007-04-26 Bayer Materialscience Ag Lichtstreuende Folien sowie deren Verwendung in Flachbildschirmen
CA2629843C (fr) † 2005-11-15 2013-05-07 Arkema France Composition thermoplastique diffusant de la lumiere blanche
JP2008139736A (ja) * 2006-12-05 2008-06-19 Sumitomo Chemical Co Ltd 光拡散板
DE102007059632A1 (de) * 2007-12-10 2009-06-18 Evonik Röhm Gmbh Formkörper mit matter und strukturierter Oberflächenbeschaffenheit
RU2468286C2 (ru) * 2008-04-28 2012-11-27 Шарп Кабусики Кайся Осветительное устройство, устройство отображения и телевизионный приемник
US20110199286A1 (en) * 2010-02-13 2011-08-18 Robin Dziama Spherical Electronic LCD Display
EP2407346B1 (fr) 2010-07-15 2016-06-01 SMR Patents S.à.r.l. Élément d'éclairage pour un aspect homogène
TWI512066B (zh) * 2012-01-16 2015-12-11 Toyo Ink Sc Holdings Co Ltd 光散射層用樹脂組成物、光散射層、及有機電致發光裝置
JP5263460B1 (ja) * 2012-06-12 2013-08-14 東洋インキＳｃホールディングス株式会社 光散乱層用樹脂組成物、光散乱層、および有機エレクトロルミネッセンス装置
CN104704400B (zh) 2012-10-01 2018-01-09 阿科玛法国公司 光学光漫射器及用于其测量的方法
FR2999977B1 (fr) * 2012-12-21 2018-03-16 Saint Gobain Vitrage comprenant un systeme a diffusion lumineuse variable utilise comme ecran
CN105073804B (zh) * 2013-03-25 2018-01-19 赢创罗姆有限公司 具有抗冲击性并具有改进的光学性质的pmma
JP6435870B2 (ja) * 2015-01-19 2018-12-12 東洋インキＳｃホールディングス株式会社 光散乱層用樹脂組成物、光散乱層、および有機エレクトロルミネッセンス装置
WO2016137919A1 (fr) 2015-02-24 2016-09-01 Arkema France Revêtements d'éclairage à diffusion à haute efficacité
US11719411B2 (en) 2015-02-24 2023-08-08 Trinseo Europe Gmbh High efficiency diffusion lighting coverings
HUE050397T2 (hu) 2018-02-05 2020-12-28 Roehm America Llc Javított szórási hatékonyságú és javított mechanikai tulajdonságú fénytszóró polimer készítmény
CN114644821A (zh) * 2020-12-21 2022-06-21 金发科技股份有限公司 一种聚碳酸酯材料及其制备方法与应用
CN118786173A (zh) 2022-04-15 2024-10-15 Sabic环球技术有限责任公司 光漫射热塑性组合物

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6377940A (ja) 1986-09-19 1988-04-08 Toshiba Silicone Co Ltd 真球状ポリメチルシルセスキオキサン粉末およびその製造方法
CA1337104C (fr) 1986-11-18 1995-09-26 William James Work Polymeres thermoplastiques dispersant la lumiere
US5237004A (en) * 1986-11-18 1993-08-17 Rohm And Haas Company Thermoplastic and thermoset polymer compositions
US5004785A (en) * 1987-11-30 1991-04-02 Mitsubishi Rayon Co., Ltd. Light-diffusing methacrylic resin and process for production thereof
DE3878556T2 (de) 1988-05-18 1993-08-05 Rohm & Haas Thermoplastische und waermehaertbare zusammensetzungen.
JP2981268B2 (ja) * 1990-09-27 1999-11-22 株式会社クラレ レンチキュラーレンズシート
JPH0551480A (ja) 1991-08-26 1993-03-02 Matsushita Electric Works Ltd 高透過高拡散プラスチツク
US5307205A (en) * 1992-03-20 1994-04-26 Rohm And Haas Company Bilayer rear projection screens
DE4327464A1 (de) 1993-08-16 1995-02-23 Roehm Gmbh Verfahren zur Herstellung monodisperser Poly(meth)acrylat-Teilchen
JP3575098B2 (ja) 1995-01-30 2004-10-06 住友化学工業株式会社 成形品の製造方法
US6346311B1 (en) * 1997-09-10 2002-02-12 Nashua Corporation Projection screen material and methods of manufacture
EP1152286A4 (fr) * 1998-12-18 2002-05-15 Mitsubishi Rayon Co Ecran de transmission
IT1307920B1 (it) * 1999-01-22 2001-11-29 Atochem Elf Sa Compositi diffondenti la luce.
JP4190649B2 (ja) 1999-04-16 2008-12-03 旭化成ケミカルズ株式会社 耐衝撃性光拡散樹脂板
JP4134440B2 (ja) * 1999-04-30 2008-08-20 カシオ計算機株式会社 電子計算装置及びプログラムを記憶した記憶媒体
WO2001022129A1 (fr) * 1999-09-20 2001-03-29 3M Innovative Properties Company Films optiques possedant au moins une couche contenant des particules
JP2001192452A (ja) 2000-01-13 2001-07-17 Ge Toshiba Silicones Co Ltd 球状シリコーン微粒子およびその製造方法
JP4652527B2 (ja) * 2000-05-16 2011-03-16 株式会社きもと 光拡散性シート
US6665118B2 (en) * 2000-08-30 2003-12-16 Matsushita Electric Industrial Co., Ltd. Rear-projection screen and rear-projection image display
DE60118960T2 (de) * 2000-12-15 2007-01-04 E.I. Dupont De Nemours And Co., Wilmington Donorelement zur einstellung des brennpunktes eines bilderzeugungslasers
DE10065492A1 (de) * 2000-12-28 2003-06-26 Roehm Gmbh Diffus ausgestattete Formmassen und hieraus erhältliche Formkörper
DE10156068A1 (de) * 2001-11-16 2003-05-28 Roehm Gmbh Lichtleitkörper sowie Verfahren zu dessen Herstellung
DE10222250A1 (de) * 2002-05-16 2003-11-27 Roehm Gmbh Verbesserte Lichtleitkörper sowie Verfahren zu dessen Herstellung
DE10251778A1 (de) * 2002-11-05 2004-05-19 Röhm GmbH & Co. KG Rückprojektionsschirm sowie Verfahren zu dessen Herstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005022245A1 *

Also Published As

Publication number Publication date
KR20060056365A (ko) 2006-05-24
TW200523645A (en) 2005-07-16
US20060240200A1 (en) 2006-10-26
ZA200601021B (en) 2007-11-28
MXPA06001067A (es) 2006-04-11
RU2006106618A (ru) 2006-08-27
DE10336130A1 (de) 2005-02-24
CN1829936A (zh) 2006-09-06
US7629041B2 (en) 2009-12-08
RU2359298C2 (ru) 2009-06-20
AU2004269463A1 (en) 2005-03-10
JP2007501425A (ja) 2007-01-25
WO2005022245A1 (fr) 2005-03-10
CN100541283C (zh) 2009-09-16
NZ545549A (en) 2010-01-29
BRPI0413302A (pt) 2006-10-10
CA2534538A1 (fr) 2005-03-10
HK1094044A1 (en) 2007-03-16
AU2004269463B2 (en) 2010-05-20

Similar Documents

Publication Publication Date Title
EP1660935A1 (fr) Diffuseur pour applications lcd, procede de production correspondant et utilisation
EP1644173B1 (fr) Procede de production de pieces moulees dispersant la lumiere dotees d'excellentes proprietes optiques
WO2005022253A1 (fr) Ecran de retroprojection resistant aux rayures et son procede de production
EP1468330B1 (fr) Écran de rétroprojection et procédé pour le produire
EP2556395B1 (fr) Corps conducteur de lumière doté d'une haute intensité lumineuse et d'une plus grande transparence
US20020123565A1 (en) Moulding compositions with diffusing properties and mouldings obtainable from these
EP1453900B1 (fr) Element de guidage de lumiere et procede de fabrication associe
WO2003098270A2 (fr) Element de guidage de lumiere ameliore et procede de production de cet element
EP1629044A1 (fr) Corps faconnes pour la publicite lumineuse et leur procede de production
EP1723469B1 (fr) Ecran de retroprojection pour une projection en 3d et procede pour le produire
EP1652002A1 (fr) Ecran de retroprojection stable et son procede de production
JP3552346B2 (ja) 光拡散性メタクリル系樹脂組成物および該組成物からなるシート状物
DE102009045632A1 (de) Polymerpartikel
DE10320317A1 (de) Formmasse zur Herstellung von temperaturstabilen lichtstreuenden Formteilen sowie hieraus erhaltene Formteile
WO2007028691A1 (fr) Dispositif pour realiser la retroprojection d'un rayonnement, procede pour realiser le dispositif, et utilisation d'un support de retroprojection

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20060111

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

RIN1 Information on inventor provided before grant (corrected)

Inventor name: GROOTHUES, HERBERT

Inventor name: PARUSEL, MARKUS

Inventor name: DR. SCHMIDT, JANN

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ROEHM GMBH

17Q First examination report despatched

Effective date: 20060629

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20060629

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: EVONIK ROEHM GMBH

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: EVONIK ROEHM GMBH

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 20081129