CN101788131A - Lgp - Google Patents

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CN101788131A
CN101788131A CN201010104355A CN201010104355A CN101788131A CN 101788131 A CN101788131 A CN 101788131A CN 201010104355 A CN201010104355 A CN 201010104355A CN 201010104355 A CN201010104355 A CN 201010104355A CN 101788131 A CN101788131 A CN 101788131A
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resin
lgp
ultra
violet absorber
roller
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前川智博
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Sumitomo Chemical Co Ltd
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Sumitomo Chemical Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects
    • 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
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Laminated Bodies (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Liquid Crystal (AREA)

Abstract

The invention provides transmitance, processability and operating characteristic guide plate with excellent light.It is the LGP that constitutes by acrylate resin layer and the polycarbonate resin that is laminated in this acrylate resin layer two sides.Aforesaid propylene acid resin layer is preferably formed by acrylic acid resin composition, described acrylic acid resin composition is with respect to acrylic resin 100 weight portions, and the malonate that is selected from that contains 0.001～1 weight portion is that ultra-violet absorber, oxanilide are that ultra-violet absorber and acetic acid esters are at least a kind of reagent in the ultra-violet absorber.Above-mentioned polycarbonate resin is preferably formed by poly carbonate resin composition, and described poly carbonate resin composition contains 0.01～1 parts by weight of acrylic resin with respect to polycarbonate resin 100 weight portions.

Description

LGP
Technical field
The present invention relates to by acrylate resin layer and be laminated in the LGP that the polycarbonate resin on its two sides constitutes.
Background technology
In the past, use the good methyl methacrylate of the transparency as LGP is resin more.Methyl methacrylate is that resin can be with high-transmission rate by the light from light sources such as cold-cathode tube, LED.Therefore, about thick 3～5mm is the plate that resin forms by methyl methacrylate, is used as the LGP of the backlight of notebook personal computer, LCD monitor etc.
On the other hand, the LGP that uses in mobile phone, the portable game etc., slimming has been developed to about thick 1～2mm, not only using methyl methacrylate is resin, also brings into use the high polycarbonate-based resin of intensity, contains the resin of the ethylene unsaturated monomer unit of alicyclic structure.
The trend of slimming is remarkable recently, and in the purposes of mobile phone, portable game etc., expectation thickness is less than the LGP of 1mm.How LGP forms by injection moulding, but the LGP of slimming is difficult to injection moulding like this.In addition, be in the notebook personal computer, LCD monitor etc. of resin at the methyl methacrylates that use more, necessity of type has also appearred will big picture thin type changing into, and adopt injection moulding in the past to be difficult to tackle.And then methyl methacrylate is that resin has easily cracked characteristic, if attenuation then also cause difficulty in operating aspect.
In order to tackle such problem, the technology (for example, with reference to Patent Document 1) that the technology of having considered to use as LGP by the film that polycarbonate-based resin of extrusion molding or acrylic resin obtain, the film that rubber particles will be dispersed in obtain in the methacrylic resin use as LGP.
Therefore yet in the time of will being used for LGP by the film that the polycarbonate-based resin of extrusion molding obtains, polycarbonate-based resin is because transmitance is poor, when the light that sends from light source is by long light path, has the briliancy that the obtains inadequate trend that becomes.This trend becomes remarkable when the area of LGP is big.In addition, in the time of will being used for LGP by the film that the extrusion molding acrylic resin obtains, when adopting punch process to wait the shape of adjusting the LGP that obtains, the trend that exists LGP to crack, the operating characteristic of the LGP that obtains is insufficient.
On the other hand, will rubber particles is dispersed in the methacrylic resin and the film that obtains when being used for LGP, though adopt processability, the operating characteristic of punch process etc. good, transmitance be insufficient.
Patent documentation 1: TOHKEMY 2008-218207 communique
Summary of the invention
Problem of the present invention is, transmitance, processability and operating characteristic guide plate with excellent light are provided.
(1) a kind of LGP is made of acrylate resin layer and the polycarbonate resin that is laminated in this acrylate resin layer two sides.
(2) above-mentioned (1) described LGP, aforesaid propylene acid resin layer is formed by acrylic acid resin composition, described acrylic acid resin composition is with respect to acrylic resin 100 weight portions, and the malonate that is selected from that contains 0.001～1 weight portion is that ultra-violet absorber, oxanilide are that ultra-violet absorber and acetic acid esters are at least a kind of reagent in the ultra-violet absorber.
(3) above-mentioned (1) or (2) described LGP, above-mentioned polycarbonate resin is formed by poly carbonate resin composition, and described poly carbonate resin composition contains 0.01～1 parts by weight of acrylic resin with respect to polycarbonate resin 100 weight portions.
The LGP of above-mentioned (1), the transmitance of long light path is outstanding, and not easily broken, so processability and operating characteristic are outstanding, therefore, above-mentioned (1) though LGP under the situation of thin thickness, also can be well as the LGP of the backlight of liquid crystal etc.
The LGP of above-mentioned (2), because acrylate resin layer contains specific ultra-violet absorber with special ratios, so the light resistance height.
The LGP of above-mentioned (3), because polycarbonate resin contains acrylic resin with special ratios, so polycarbonate resin is to the adaptation height of acrylate resin layer.
Description of drawings
Fig. 1 is the diagrammatic illustration figure that the manufacturing method of light conducting board of one embodiment of the present invention is shown.
Fig. 2 is the summary cross sectional illustration figure that the metallic roll and the resilient roller of an embodiment of the present invention are shown.
Fig. 3 is the summary cross sectional illustration figure that the resilient roller of other embodiment of the present invention is shown.
Symbol description:
1,2 extruders
3 mouthfuls of moulds
4 molten resins
5 chill rolls
6 metallic roll
7,15 metallic elastic rollers
8,16 beaming rollers
9,17 metal made membranes
10 fluids
11 LGPs
The specific embodiment
LGP of the present invention is made of acrylate resin layer and the polycarbonate resin that is laminated in its two sides.
So-called aforesaid propylene acid resin layer is to contain the resin bed of acrylic resin as principal component.
Aforesaid propylene acid resin layer can be the layer that is only formed by the aforesaid propylene acid resin, but the layer that preferably forms by the acrylic acid resin composition that contains the aforesaid propylene acid resin.
Acrylic resin as constituting aforesaid propylene acid resin layer generally uses methacrylic resin.Described acrylic resin can be that methyl methacrylate units is the imperplex of 100 weight %, also can be methyl methacrylate and can with the copolymer of other monomers more than a kind of this methyl methacrylate copolymer.Wherein, it preferably is the resin of principal component with the methyl methacrylate, specifically, preferably contain the polymethyl methacrylate resin of the above methyl methacrylate units of 50 weight %, more preferably contain the polymethyl methacrylate resin of the above methyl methacrylate units of 70 weight %.
As above-mentioned can with the example of other monomers of methyl methacrylate copolymer, for example can enumerate the methyl acrylic ester beyond the methyl methacrylates such as EMA, butyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate, methacrylic acid 2-Octyl Nitrite, methacrylic acid 2-hydroxyl ethyl ester; Esters of acrylic acids such as methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, benzyl acrylate, 2-EHA, acrylic acid 2-hydroxyl ethyl ester etc.In addition, can also enumerate for example halogenated styrenes such as chlorostyrene, bromstyrol class of styrene, substituted phenylethylene class; Ring-alkylated styrenes such as vinyltoluene, AMS class etc.And then, can also enumerate unsaturated acids such as methacrylic acid, acrylic acid, acrylonitrile, methacrylonitrile, maleic anhydride, phenyl maleimide, cyclohexyl maleimide etc.
In order to improve the light resistance of LGP, acrylic acid resin composition preferably contains the ultra-violet absorber more than a kind.Content about this ultra-violet absorber, be preferably 0.001～1 weight portion with respect to acrylic resin 100 weight portions, more preferably 0.005～0.5 weight portion, further more preferably 0.005～0.1 weight portion, when the content of this ultra-violet absorber is very few, sometimes the LGP that obtains becomes insufficient to the ultraviolet light resistance of being sent by light source, and when the content of ultra-violet absorber was too much, the expense of cost increased.
As ultra-violet absorber, preferably ultra-violet absorber, the especially maximum absorption wavelength of 250～800nm scope that 250～320nm significantly has very big absorbing wavelength in the scope (below, be sometimes referred to as " λ Max") be the ultra-violet absorber of this very big absorbing wavelength, can improve the light resistance of LGP, and suppress to absorb the painted of LGP that visible light causes and the light that penetrates from LGP painted by ultra-violet absorber.In addition, as ultra-violet absorber, the molar absorption coefficient of maximum absorption wave strong point (below, be sometimes referred to as " ε Max") be 10000mol -1Cm -1Below especially be 15000mol -1Cm -1Above ultra-violet absorber, molecular weight (below, be sometimes referred to as " Mw ") be the ultra-violet absorber below 400, be preferred from the viewpoint that reduces operating weight.
In addition, as ultra-violet absorber, for example can use the benzophenone series ultra-violet absorber, cyanoacrylate is a ultra-violet absorber, salicylate is a ultra-violet absorber, the nickel complex salt is a ultra-violet absorber, benzoic ether is a ultra-violet absorber, BTA is a ultra-violet absorber, malonate is a ultra-violet absorber, oxanilide is a ultra-violet absorber, acetic acid esters is a ultra-violet absorber etc., wherein, preferred benzophenone series ultra-violet absorber, BTA is a ultra-violet absorber, malonate is a ultra-violet absorber, oxanilide is a ultra-violet absorber, acetic acid esters is a ultra-violet absorber, especially malonate is a ultra-violet absorber, oxanilide is a ultra-violet absorber, acetic acid esters is a ultra-violet absorber, can improve the light resistance of LGP, and suppress to absorb visible photogenic LGP and penetrate the painted of light by ultra-violet absorber.
As the benzophenone series ultra-violet absorber, for example can enumerate 2,4-dihydroxy benaophenonel (Mw:214, λ Max: 288nm, ε Max: 14100mol -1Cm -1), 2-hydroxyl-4-methoxy benzophenone (Mw:228, λ Max: 289nm, ε Max: 14700mol -1Cm -1), 2-hydroxyl-4-methoxy benzophenone-5-sulfonic acid (Mw:308, λ Max: 292nm, ε Max: 12500mol -1Cm -1), 2-hydroxyl-4-octyloxy benzophenone (Mw:326, λ Max: 291nm, ε Max: 15300mol -1Cm -1), 4-dodecyloxy-2-dihydroxy benaophenonel (Mw:383, λ Max: 290nm, ε Max: 16200mol -1Cm -1), 4-benzyloxy-2-dihydroxy benaophenonel (Mw:304, λ Max: 289nm, ε Max: 15900mol -1Cm -1), 2,2 '-dihydroxy-4,4 '-dimethoxy-benzophenone (Mw:274, λ Max: 289nm, ε Max: 11800mol -1Cm -1), 1, two (4-benzoyl-3-hydroxyphenoxy)-hexane (Mw:511, the λ of 6- Max: 290nm, ε Max: 30100mol -1Cm -1), 1, two (4-benzoyl-3-hydroxyphenoxy)-butane (Mw:483, the λ of 4- Max: 290nm, ε Max: 28500mol -1Cm -1) etc.
As cyanoacrylate is ultra-violet absorber, for example can enumerate 2-cyano group-3,3-diphenyl-ethyl acrylate (Mw:277, λ Max: 305nm, ε Max: 15600mol -1Cm -1), 2-cyano group-3,3-diphenylacrylate 2-Octyl Nitrite (Mw:362, λ Max: 307nm, ε Max: 14400mol -1Cm -1) etc.
As salicylate is ultra-violet absorber, for example can enumerate phenyl salicytate (Mw:214, λ Max: 312nm, ε Max: 5000mol -1Cm -1), salicylic acid 4-tert-butyl group phenyl ester (Mw:270, λ Max: 312nm, ε Max: 5400mol -1Cm -1) etc.
As the nickel complex salt is ultra-violet absorber, for example can enumerate (2,2 '-thiobis (4-tert-octyl phenol salt))-2-DEHA and close nickel (II) (Mw:629, λ Max: 298nm, ε Max: 6600mol -1Cm -1) etc.
As benzoic ether is ultra-violet absorber, for example can enumerate 2 ', 4 '-di-tert-butyl-phenyl-3,5-di-tert-butyl-4-hydroxybenzoic acid ester (Mw:436, λ Max: 267nm, ε Max: 20200mol -1Cm -1) etc.
As BTA is ultra-violet absorber, for example can enumerate 2-(2-hydroxy-5-methyl base phenyl)-2H-BTA (Mw:225, λ Max: 300nm, ε Max: 13800mol -1Cm -1), 5-chloro-2-(3,5-di-t-butyl-2-hydroxy phenyl)-2H-BTA (Mw:358, λ Max: 312nm, ε Max: 14600mol -1Cm -1), 2-(the 3-tert-butyl group-2-hydroxy-5-methyl base phenyl)-5-chloro-2H-BTA (Mw:316, λ Max: 354nm, ε Max: 14300mol -1Cm -1), 2-(3,5-two tertiary pentyls-2-hydroxy phenyl)-2H-BTA (Mw:352, λ Max: 305nm, ε Max: 15200mol -1Cm -1), 2-(3,5-di-t-butyl-2-hydroxy phenyl)-2H-BTA (Mw:323, λ Max: 303nm, ε Max: 15600mol -1Cm -1), 2-(2H-BTA-2-yl)-4-methyl-6-(3,4,5,6-tetrahydric phthalimide ylmethyl) phenol (Mw:388, λ Max: 304nm, ε Max: 14100mol -1Cm -1), 2-(2-hydroxyl-uncle's 5-octyl phenyl)-2H-BTA (Mw:323, λ Max: 301nm, ε Max: 14700mol -1Cm -1) etc.
As malonate is ultra-violet absorber, can enumerate 2-(1-aryl alkylene) malonate class, wherein, preferably uses the compound shown in the following general formula (1).
(in the formula, X 1Expression hydrogen atom, the alkyl of carbon number 1～6 or the alkoxyl of carbon number 1～6, R 1And R 2Be identical or different separately group, represent the alkyl of carbon number 1～6 respectively.)
In the above-mentioned general formula (1), X 1Represented alkyl and X 1Alkyl in the represented alkoxyl can be respectively that the straight chain shape also can be a chain, for example can enumerate methyl, ethyl, n-pro-pyl, isopropyl, normal-butyl, isobutyl group, sec-butyl, the tert-butyl group etc.X 1Be preferably the alkyl of hydrogen atom, carbon number 1～4 or the alkoxyl of carbon number 1～4, X 1The position of substitution be preferably contraposition.
In addition, in the above-mentioned general formula (1), R 1And R 2Represented alkyl can be respectively that the straight chain shape also can be a chain, for example can enumerate methyl, ethyl, n-pro-pyl, isopropyl, normal-butyl, isobutyl group, sec-butyl, the tert-butyl group etc.R 1And R 2Be preferably the alkyl of carbon number 1～4 respectively.
As the compound shown in the above-mentioned general formula (1), preferred especially 2-(to the methoxyl group benzal) dimethyl malenate (Mw:250, λ Max: 308nm, ε Max: 24200mol -1Cm -1).
As oxanilide is ultra-violet absorber, can enumerate alkoxyl oxanilide class, wherein, preferably uses the compound shown in the following general formula (2).
Figure GSA00000009393500071
(in the formula, R 3And R 4Be identical or different separately group, represent the alkyl of carbon number 1～6 respectively.)
In the above-mentioned general formula (2), R 3And R 4Represented alkyl can be respectively that the straight chain shape also can be a chain, for example can enumerate methyl, ethyl, n-pro-pyl, isopropyl, normal-butyl, isobutyl group, sec-butyl, the tert-butyl group etc.R 3And R 4Be preferably the alkyl of carbon number 1～4 respectively.In addition, R 3And R 4The position of substitution be preferably the ortho position.
As the compound shown in the above-mentioned general formula (2), preferred especially 2-ethyoxyl-2 '-ethyl oxanilide (Mw:312, λ Max: 298nm, ε Max: 16700mol -1Cm -1).
As acetic acid esters is ultra-violet absorber, can enumerate 2-(1-aryl alkylene) acetate esters, wherein, preferably uses the compound shown in the following general formula (3).
Figure GSA00000009393500072
(in the formula, X 2Expression hydrogen atom, alkyl or alkoxyl, R 5The expression alkyl.)
As substituent X 2Alkoxyl, can be that the straight chain shape also can be a chain, for example can enumerate the alkoxyl of carbon numbers about 1～6 such as methoxyl group, ethyoxyl, positive propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy, tert-butoxy, n-pentyloxy, the alkoxyl of preferred carbon number about 1～4.Alkyl can be that the straight chain shape also can be a chain, for example can enumerate the alkyl of carbon numbers about 1～6 such as methyl, ethyl, n-pro-pyl, isopropyl, normal-butyl, isobutyl group, sec-butyl, the tert-butyl group, n-pentyl, n-hexyl, the alkyl of preferred carbon number about 1～4, further preferred methoxyl group.Substituent X 2Be preferably alkoxyl.
As substituent R 5Alkyl, usually can enumerate the alkyl of carbon number about 1～10, for example can enumerate the alkyl of carbon numbers about 1～10 such as methyl, ethyl, n-pro-pyl, isopropyl, normal-butyl, isobutyl group, sec-butyl, the tert-butyl group, n-pentyl, n-hexyl, n-heptyl, n-octyl, n-nonyl, positive decyl, 1-methyl amyl, 1-ethyl pentyl group, 1-methyl hexyl, 2-ethylhexyl etc., preferable methyl, 2-ethylhexyl etc.
In order further to improve light resistance, acrylic acid resin composition contains hindered amine (Hindered Amine) class more than a kind, especially preferably contains to have 2,2,6, the compound of 6-tetraalkyl piperidines skeleton.The content of hindered amines is below common 2 times of weight of the ultra-violet absorber that contains in the acrylate resin layer, preferred 0.01～1 times of weight.
As hindered amines, for example can enumerate dimethyl succinate/1-(2-hydroxyethyl)-4-hydroxyl-2,2,6,6-tetramethyl piperidine condensation polymer, it is poly-that ((6-(1,1,3, the 3-tetramethyl butyl) imino group-1,3,5-triazine-2,4-two bases) ((2,2,6,6-tetramethyl-4-piperidyl) imino group) hexa-methylene ((2,2,6,6-tetramethyl-4-piperidyl) imino group)), 2-(2, the 3-di-tert-butyl-4-hydroxyl benzyl)-2-n-butylmalonic acid two (1,2,2,6,6-pentamethyl-4-piperidyl), 2-(3, the 5-di-tert-butyl-4-hydroxyl benzyl)-2-n-butylmalonic acid two (1,2,2,6,6-pentamethyl-4-piperidyl), N, N '-two (3-aminopropyl) ethylenediamine/2, the two (N-butyl-N-(1,2 of 4-, 2,6,6-pentamethyl-4-piperidyl) amino)-6-chloro-1,3,5-triazine condensation product, two (2,2,6,6-tetramethyl-4-piperidyl) sebacate, butanedioic acid two (2,2,6,6-tetramethyl-4-piperidyl), compound shown in the following general formula (4) etc.
Figure GSA00000009393500081
(in the formula, Y represents the alkyl of hydrogen atom, carbon number 1～20, the carboxyalkyl of carbon number 2～20, the alkoxyalkyl of carbon number 2～25 or the alkoxycarbonyl alkyl of carbon number 3～25.)
In the above-mentioned general formula (4), 2 alkyl in the represented alkyl of Y, carboxyalkyl, the alkoxyalkyl (alkyl that the alkyl of alkoxyl and alkoxy replace), and 2 alkyl in the alkoxycarbonyl alkyl (alkyl of alkoxyl and the alkyl that is replaced by alkoxy carbonyl group), can be respectively that the straight chain shape also can be a chain, Y is preferably the alkoxycarbonyl alkyl of hydrogen atom or carbon number 5～24, further preferred hydrogen atom or alkoxy carbonyl group ethyl.As this alkoxy carbonyl group ethyl, for example can enumerate dodecane oxygen carbonyl ethyl, tetradecane oxygen carbonyl ethyl, hexadecane oxygen carbonyl, octadecane oxygen carbonyl ethyl etc.
Above-mentioned polycarbonate resin is to contain the resin bed of polycarbonate resin as principal component.
Above-mentioned polycarbonate resin can be the layer that is only formed by above-mentioned polycarbonate resin, but the layer that preferably forms by the poly carbonate resin composition that contains above-mentioned polycarbonate resin.
The so-called polycarbonate resin that constitutes above-mentioned polycarbonate resin is that whole monomeric units joint portion each other is by the carbonate group (polymer that O-(C=O)-O-) constitutes.
As above-mentioned polycarbonate resin, for example can enumerate by interface polycondensation, melt transesterification process etc. make dihydric phenol more than a kind and the reaction of the carbonylation agent more than a kind and resin; The resin that the polymerization of carbonic ester prepolymer is got by solid phase ester-interchange method etc.; Make resin that the cyclic carbonate compound polymerization gets etc. by the ring-opening polymerisation method.
As above-mentioned dihydric phenol, for example can enumerate hydroquinones, resorcinol, 4,4 '-dihydroxybiphenyl, two (4-hydroxy phenyl) methane, two { (4-hydroxyls-3, the 5-dimethyl) phenyl } methane, 1, two (4-hydroxy phenyl) ethane of 1-, 1, two (4-the hydroxy phenyl)-1-diphenylphosphino ethanes of 1-, 2, two (4-hydroxy phenyl) propane (common name bisphenol-A) of 2-, 2, two { (4-hydroxy-3-methyl) phenyl } propane of 2-, 2, two { (the 4-hydroxyls-3 of 2-, the 5-dimethyl) phenyl } propane, 2, two { (the 4-hydroxyls-3 of 2-, the 5-dibromo) phenyl } propane, 2, two { (3-isopropyl-4-hydroxyl) phenyl } propane of 2-, 2, two { (4-hydroxyl-3-phenyl) phenyl } propane of 2-, 2, two (4-hydroxy phenyl) butane of 2-, 2, two (4-the hydroxy phenyl)-3-methybutanes of 2-, 2, two (the 4-hydroxy phenyls)-3 of 2-, the 3-dimethylbutane, 2, two (4-the hydroxy phenyl)-2-methybutanes of 4-, 2, two (4-hydroxy phenyl) pentanes of 2-, 2, two (4-the hydroxy phenyl)-4-methylpentanes of 2-, 1, the 1-bis(4-hydroxyphenyl)cyclohexane, 1, two (4-the hydroxy phenyl)-4-isopropyl cyclohexanes of 1-, 1, two (the 4-hydroxy phenyls)-3 of 1-, 3, the 5-trimethyl-cyclohexane, 9, two (4-hydroxy phenyl) fluorenes of 9-, 9, two { (4-hydroxy-3-methyl) phenyl } fluorenes of 9-, α, the adjacent diisopropyl benzene of α '-two (4-hydroxy phenyl), α, diisopropyl benzene between α '-two (4-hydroxy phenyl), α, α '-two (4-hydroxy phenyl) is to diisopropyl benzene, 1, two (the 4-hydroxy phenyls)-5 of 3-, the 7-dimethyladamantane, 4,4 '-dihydroxydiphenylsulisomer, 4,4 '-dihydroxy diphenyl sulfoxide, 4,4 '-dihydroxy diphenylsulfide, 4,4 '-dihydroxy diphenylketone, 4,4 '-dihydroxydiphenyl ether, 4,4 '-dihydroxy diphenyl etc.
Wherein, the preferred use is selected from bisphenol-A, 2, two { (4-hydroxy-3-methyl) phenyl } propane of 2-, 2, two (4-hydroxy phenyl) butane of 2-, 2, two (4-the hydroxy phenyl)-3-methybutanes of 2-, 2, two (the 4-hydroxy phenyls)-3 of 2-, 3-dimethylbutane, 2, two (4-the hydroxy phenyl)-4-methylpentanes of 2-, 1, two (the 4-hydroxy phenyls)-3,3 of 1-, 5-trimethyl-cyclohexane and α, dihydric phenol more than a kind between α '-two (4-hydroxy phenyl) in the diisopropyl benzene more preferably uses bisphenol-A separately, perhaps bisphenol-A and 1, two (the 4-hydroxy phenyls)-3 of 1-, 3, also using of 5-trimethyl-cyclohexane, bisphenol-A be selected from 2, two { (4-hydroxy-3-methyl) phenyl } propane and the α of 2-, between α '-two (4-hydroxy phenyl) in the diisopropyl benzene more than a kind dihydric phenol and use.
As above-mentioned carbonylation agent, for example can enumerate haloformate such as bishaloformate of carbonic esters such as carbonyl halide, diphenyl carbonate such as phosgene, dihydric phenol etc.
In order to improve the adaptation with acrylate resin layer, poly carbonate resin composition preferably contains acrylic resin.Specifically, constitute the poly carbonate resin composition of above-mentioned polycarbonate resin, preferably contain 0.01～1 parts by weight of acrylic resin with respect to polycarbonate resin 100 weight portions.As described acrylic resin, can use with aforesaid propylene acid resin layer in the identical acrylic resin that uses.The molecular weight ranges that acrylic resin had that poly carbonate resin composition contains is preferably 1000～100000.This molecular weight is crossed when hanging down, and acrylic resin volatilizees sometimes during extrusion molding, and when molecular weight was too high, acrylic resin and polycarbonate resin were separated sometimes, and the light transmission of the LGP that obtains reduces.
In addition, be laminated in the layer of polycarbonate on acrylate resin layer two sides, the composition of a polycarbonate resin and the composition of another polycarbonate resin can be the same or different.In addition, acrylic acid resin composition and poly carbonate resin composition can contain the additives more than a kind such as light stabilizer, antioxidant, releasing agent in the scope of the performance degradation that does not make the LGP that obtains.
LGP of the present invention preferably forms by the stacked polycarbonate resin of co-extrusion modling on the two sides of acrylate resin layer.
LGP of the present invention is by adopting co-extrusion modling with acrylate resin layer and stacked integrated manufacturing of polycarbonate resin.This co-extrusion modling can followingly be carried out, promptly, use 2 or 3 single shafts or biaxial extruder, with the material of the material of above-mentioned acrylate resin layer and polycarbonate resin respectively behind the melting mixing, Jie is undertaken stacked by feed piece mould (Off イ one De Block ロ Star Network ダ イ), branch manifold mould etc., carry out co-extrusion modling thus.Then, use stacked incorporate sheet molten resin for example that roller unit etc. carries out cooling curing, obtain LGP of the present invention.Below, with reference to accompanying drawing, an embodiment of manufacturing method of light conducting board of the present invention is described in detail.
Fig. 1 is the diagrammatic illustration figure that the manufacturing method of light conducting board of present embodiment is shown.Fig. 2 is the summary cross sectional illustration figure that the metallic roll and the resilient roller of present embodiment are shown.As shown in Figure 1, at first, with different extruder 1,2 acrylic resin and polycarbonate resin limit are heated and melting mixing respectively, the mould 3 that the limit is used from co-extrusion modling is extruded, and carries out stacked integrated.
Then, will be clamped in from the sheet molten resin 4 of mould 3 coextrusion along general horizontal direction and relatively cool off 2 chill rolls 5 of configuration, thereby obtain LGP 11.
Chill roll 5 is that metallic elastic roller 7 constitutes by the metallic roll 6 of high rigidity with in the resilient roller that peripheral part has a metal made membrane 9 as shown in Figure 2.Metallic roll 6 and metallic elastic roller 7 constitute as follows, and promptly at least one links to each other with rotary drive mechanisms such as engines, and two rollers are rotated with predetermined circumference speed.
The metallic roll 6 of high rigidity is the take up roll that is wound on the sheet LGP 11 after being held between metallic roll 6 and the metallic elastic roller 7.Metallic roll 6 is not particularly limited, can adopt in the past since in extrusion molding employed common metallic roll.As concrete example, can enumerate slotter (drilled roll), propellers etc.The surface state of metallic roll 6 for example can be a minute surface, and decorative pattern, concavo-convex etc. also can be arranged.
Metallic elastic roller 7 has: be roughly beaming roller 8 and columnar metal made membrane 9 cylindric and that be set to rotate freely, this metal made membrane 9 disposes in the mode of the outer peripheral face of this beaming roller 8 that is covered, and contact with molten resin 4, enclose fluid 10 between these beaming rollers 8 and metal made membrane 9, metallic elastic roller 7 can demonstrate elasticity thus.Above-mentioned beaming roller 8 is not particularly limited, for example forms by stainless steel etc.
Metal made membrane 9 is for example formed by stainless steel etc., as its thickness, is preferably about 2～5mm.This metal made membrane 9 preferably has bendability, flexible etc., does not preferably have the jointless structure of weld part.Metallic elastic roller 7 excellent in te pins of durability with such metal made membrane 9, and become if metal made membrane 9 mirror-polishings then can similarly be used with common mirror roller, if give decorative pattern, concavo-convex roller that then can its shape of transfer printing to metal made membrane 9, so ease of use is good.
This metal made membrane 9 is fixed by the both ends of beaming roller 8, and enclosing between beaming roller 8 and metal made membrane 9 has fluid 10.As fluid 10, for example can enumerate water, wet goods.By controlling the temperature of this fluid 10, can carry out temperature control to metallic elastic roller 7.Said temperature control can be adopted known control methods such as for example PID control, ON-OFF control.In addition, can also use gases such as air to replace fluid 10.
Between such metallic roll 6 and metallic elastic roller 7 during clamping molten resin 4, metallic elastic roller 7 is situated between by molten resin 4, outer peripheral face strain along metallic roll 6 is a concavity, and metallic elastic roller 7 and metallic roll 6 are situated between and are contacted by the contact length L of molten resin 4 with regulation.
As above-mentioned contact length L, be 1～20mm, preferred 1～10mm, more preferably 1～7mm is for well.Making above-mentioned contact length L is setting, and thickness that for example can be by adjusting metal made membrane 9, the enclosed volume of fluid 10 wait arbitrarily and carry out.Need to prove that so-called above-mentioned contact length L is meant to connect the be situated between length of straight line of the point that the point that begun to contact by molten resin 4 contacts with end of metallic elastic roller 7 and metallic roll 6.
When metallic roll 6 and metallic elastic roller 7 Jie are contacted with contact length L by molten resin 4, metallic roll 6 contacts with face with metallic elastic roller 7 carries out pressing to molten resin 4, and evenly being pressurised into planar one side is made film on one side to be held in molten resin 4 between these rollers.When making film like this, can suppress residual deformation in the LGP 11, the trend that the heat shrink characteristic of the LGP 11 that existence obtains reduces.Therefore, for this LGP 11, when using, has the inhibition warpage, the effect of the distortion of fluctuating etc. in the harsh place of temperature environment.
Specifically, when LGP 11 was placed 30 minutes under 160 ℃ thermal environment, LGP 11 had 0～5% the trend that is at the shrinkage factor S2 (%) that extrudes shrinkage factor S1 of direction (%) and width.If promptly less than 0%, when then using as LGP, because the heat of light source, LGP expands and contacts with the housing of backlight for negative for shrinkage factor S1, S2, not only LGP itself is out of shape, and the backlight unit with this LGP also deforms easily.In addition, when internal temperature rose if shrinkage factor S1, S2 above 5%, then put bright light source, it is big that the contraction of LGP becomes, but also with distortion, therefore may cause the briliancy reduction from the Lights section generation light leak.For the computational methods of above-mentioned shrinkage factor S1, S2, after narrate.
In order to reduce the heat shrink characteristic of LGP 11, during moulding, before cooling curing and even in the cooling curing process molten resin 4 is retained as by two rollers molten resin 4 being held on metallic roll 6 and metallic elastic roller 7.Specifically, heat distortion temperature (Th) with respect to acrylic resin or polycarbonate resin, comparatively ideal is to make the surface temperature (Tr) of metallic roll 6 and metallic elastic roller 7 be (Th-20 ℃)≤Tr≤(Th+20 ℃), preferably (Th-15 ℃)≤Tr≤(Th+10 ℃), the more preferably scope of (Th-10 ℃)≤Tr≤(Th+5 ℃).
On the other hand, surface temperature (Tr) is during than (Th-20 ℃) low temperature, and shrinkage factor S2 has the trend that diminishes.In addition, surface temperature (Tr) is during than (Th+20) high temperature, and shrinkage factor S1 has the trend of increase.And the residual vestige of peeling off from roller on LGP is arranged and diminish the trend of outward appearance.
For surface temperature (Tr), be benchmark with the resin that heat distortion temperature (Th) is high in acrylic resin or the polycarbonate resin.(Th) is not particularly limited as heat distortion temperature, is generally about 60～200 ℃.Heat distortion temperature (Th) is the temperature of measuring according to ASTM D-648.
The LGP 11 of the sheet after being held between metallic roll 6 and the metallic elastic roller 7 after being wound in metallic roll 6, while cool off and access to conveying roller by the not shown roller that accesses, obtains LGP 11 thus.
Below, other embodiment of manufacturing method of light conducting board of the present invention is described.Fig. 3 is the summary cross sectional illustration figure that the resilient roller of present embodiment is shown.In addition, in Fig. 3, to above-mentioned Fig. 1, the identical symbol of the component part mark that Fig. 2 is identical also omits explanation.
As shown in Figure 3, the metallic elastic roller 15 of present embodiment is to be roughly cylindric and to be made as the metallic elastic roller that the outer peripheral face of the beaming roller 16 that rotates freely forms with 17 linings of columnar metal made membrane.
Beaming roller 16 is the rubber rollers that formed by rubber such as for example silicon rubber, and metallic elastic roller 15 can show elasticity thus.By adjusting the hardness of above-mentioned rubber, can make above-mentioned contact length L is setting.
Metal made membrane 17 is for example formed by stainless steel etc., as its thickness, about preferred 0.2～1mm.
As carrying out temperature controlled formation to metallic elastic roller 15, for example the mounting support chill roll gets final product on metallic elastic roller 15.Other formation is identical with an above-mentioned embodiment, thereby omits explanation.
LGP of the present invention is a sheet, and its thickness is generally 0.05～1mm, preferred 0.1～0.8mm, more preferably 0.2～0.7mm.In the LGP of the present invention, the thickness of acrylate resin layer is preferably more than 50% of general thickness, more preferably more than 70%, further more preferably more than 80%.Thus, optical transmission characteristics becomes good.In addition, the thickness of acrylate resin layer is generally below 95% with respect to overall thickness, and is preferred below 90%.
When paying attention to the processability of LGP, the thickness of polycarbonate resin is preferably more than the 10 μ m, more preferably 10～50 μ m.The thickness of a polycarbonate resin can be identical thickness with the thickness of another polycarbonate resin, also can be respectively different thickness.The thickness of LGP can be adjusted by the thickness of the molten resin 4 extruded from above-mentioned mouthful mould 3, the interval of 2 chill rolls 5 etc.
The LGP of the present invention that obtains like this, transmitance is outstanding, even and also not easily broken under the situation of thin thickness, so processability and operating characteristic are outstanding.Therefore, for example use with LGP as the backlight of the guidance panel of auto-navigation system, portable information terminal, industrial machine, portable game, notebook personal computer, LCD monitor, LCD TV etc.Because maximize can development for the thin-walled of backlight from now on, so can think and particularly be applicable to LGP more than 5 inches.
LGP of the present invention can implement to adopt processing such as sawing is disconnected, Thomson cutter (ト system ソ Application sword) waits the bending of cutting out, apply heat, vacuum, the moulding of pressure sky, end surface grinding.In addition, can also adopt for example point type printing, extrusion forming, curable resin coating etc., LGP of the present invention be carried out shape give.
Below, embodiments of the invention are shown, but the present invention is not limited to this.Shown in being constructed as follows of the extrusion device that uses in following embodiment and the comparative example.
Extruder 1: screw diameter 65mm, single shaft, band air vent (Toshiba Machine Co. Ltd's system).
Extruder 2: screw diameter 45mm, single shaft, band air vent (Ship-building Company of Hitachi system).
Feed piece: two kinds three layers distribution (Ship-building Company of Hitachi system).
Mouth mould 3:T type mouth mould, the wide 1400mm of die lip, die lip is 1mm (Ship-building Company of Hitachi system) at interval.
Roller: horizontal, face length 1400mm, 2 of the chill rolls of diameter 300 φ.
Extruder 1,2, a mouthful mould 3 are configured as shown in Figure 1, and the feed piece are configured in assigned position.Then, with being made as roller No. 1 from extruder 1,2 nearest rollers in above-mentioned 2 chill rolls, take up roll is made as roller No. 2, the following formation of each roller.
＜roller constitutes 1 〉
Formation shown in Figure 2 is constituted 1 as roller.Specifically, make No. 1 roller and No. 2 following formations of roller.
(No. 1 roller)
The metallic elastic roller 7 that will dispose metal made membrane 9 in the mode of outer peripheral face of lining beaming roller 8 and enclosed fluid 10 between beaming roller 8 and metal made membrane 9 is as No. 1 roller.Beaming roller 8, metal made membrane 9 and fluid 10 are as follows.
Beaming roller 8: stainless steel
Metal made membrane 9: the mirror metal sleeve of the stainless steel of thick 2mm
Fluid 10: be oil,, can carry out temperature control to metallic elastic roller 7 by controlling this oily temperature.More particularly, the ON-OFF by the adjustment machine controls and heats, cools off above-mentioned oil, thereby can carry out temperature control, and it is circulated between beaming roller 8 and metal made membrane 9.
(No. 2 rollers)
Adopt the propellers of stainless steel that surface state is made as minute surface as the metallic roll 6 of high rigidity, with it as No. 2 rollers.
In addition, metallic elastic roller 7 is 4mm with the contact length L that metallic roll 6 Jie are contacted by molten resin 4.
＜roller constitutes 2 〉
No. 1 roller and No. 2 rollers all adopt the metallic roll (surface state is made as the propellers of the stainless steel of minute surface) of high rigidity.
The resin that uses in following embodiment and the comparative example is as follows.
Resin 1: the methyl methacrylate that has added molecular weight 30000 in aromatic copolycarbonate (" Calibre200-13 " of SUMITOMO DOW corporate system) 100 weight portions is the poly carbonate resin composition that resin (" the DIANAL BR83 " of the beautiful positive corporate system of Mitsubishi) 0.1 weight portion forms.Heat distortion temperature (Th) is 140 ℃.
Resin 2: having added malonate in copolymer 1 00 weight portion of methyl methacrylate/methyl acrylate=94/6 (weight ratio) is the acrylic acid resin composition that ultra-violet absorber 0.01 weight portion forms.Heat distortion temperature (Th) is 100 ℃.Above-mentioned malonate is that ultra-violet absorber uses X in the above-mentioned general formula (1) 1For methoxyl group and its position of substitution are contraposition, R 1And R 2For the compound of methyl is 2-(to the methoxyl group benzal) dimethyl malenate (trade name of Clariant corporate system " Sanduvor PR-25 ").
[embodiment 1～8 and comparative example 3]
The making of＜LGP 〉
As resin bed A, the resin of the kind shown in the table 1 is carried out melting mixing with extruder 1, be supplied to the feed piece.On the other hand,, the resin of the kind shown in the table 1 is carried out melting mixing with extruder 2, be supplied to the feed piece as resin bed B.With the resin bed A that is supplied to the feed piece from extruder 1 be the intermediate layer, the resin bed B that is supplied to the feed piece from extruder 2 is the mode on two top layers, carries out co-extrusion modling.
Then, while No. 1 roller and No. 2 roller clamping system films that will use roller shown in the table 1 to constitute from the molten resin 4 that mouth mould 3 is extruded obtain the LGP that is made of 3-tier architecture of thickness shown in the table 1.In addition, the surface temperature of No. 1 roller is 130 ℃, and the surface temperature of No. 2 rollers is 140 ℃.These temperature are measured values of each roll surface temperature.In addition, " thickness " expression resin bed A in the extruder 1,2 in the table 1, each thickness of B, the gross thickness of the LGP that " gross thickness " expression obtains.
[comparative example 1,2]
The resin of kind shown in the table 1 is carried out melting mixing with extruder 1, press the sequentially feeding of feed piece and mouthful mould 3.Then, while No. 1 roller and No. 2 roller clamping system films that will use roller shown in the table 1 to constitute from the molten resin 4 that mouth mould 3 is extruded obtain the LGP that is made of single layer structure of thickness shown in the table 1.In addition, in the comparative example 1, the surface temperature of No. 1 roller is 130 ℃, and the surface temperature of No. 2 rollers is 140 ℃.In addition, in the comparative example 2, the surface temperature of No. 1 roller is 100 ℃, and the surface temperature of No. 2 rollers is 95 ℃.
＜estimate
For each LGP that obtains (embodiment 1～8 and comparative example 1～3), carry out the evaluation of shrinkage factor, long light path transmissivity and cutting machine.Each evaluation method is as follows, and its result is shown in table 1 in the lump.
(shrinkage factor)
At first, the size square with about 10cm cuts out test film by the LGP that obtains, and measures the size of extruding direction (MD0) of this test film and the size (TD0) of width respectively.Then, in metal tubbing, be coated with baby powder (with " the Siccarol Hi " of light hall corporate system), place above-mentioned test film thereon, dropped in 160 ℃ the baking oven 30 minutes.
Then, measure the size of extruding direction (MD) of the cooled test film of nature and the size (TD) of width respectively, with each size substitution formula: the shrinkage factor S1={1-(MD/MD0) that obtains } * 100, formula: shrinkage factor S2={1-(TD/TD0) * 100 in, calculate shrinkage factor S1, S2.In addition, calculate than (S1/S2) by the shrinkage factor S1 that calculates, S2.Among shrinkage factor S1 in the table 1, the S2 ,+the result represent to shrink ,-the result represent to expand.
(long light path transmissivity)
At first, cut out test film by the LGP that obtains, 4 limits of this test film are ground with edge grinding machine (" PB-500 " of MEGAROTECHNICA corporate system) with the size of 10cm * 4cm.Then, use spectrophotometer (" U4000 type " band integrating sphere of (strain) Hitachi system), measure the light transmission of this test film for light path 10cm, wavelength 300～800nm with the 5nm scale, obtain the average transmittance of the light of wavelength 380～780nm, with it as long light path transmissivity.
(cutting machine evaluation)
The LGP that obtains is cut off with cutting machine, and visualization has flawless generation.In addition, determinating reference uses following benchmark.
Zero: do not crack
*: produced crackle
Table 1
Figure GSA00000009393500181
As shown in Table 1, the LGP of embodiment 1～8, long light path optical transmission characteristics is outstanding, and not easily broken.Especially adopt the embodiment 1,3～6 of roller formation 1 and 8 LGP, shrinkage factor is little.
On the other hand, the LGP of the LGP of the comparative example 1 that is made of the single layer structure of polycarbonate resin and the comparative example 3 that forms at the stacked acrylate resin layer in the two sides of polycarbonate resin all demonstrates the result of long light path optical transmission characteristics difference.In addition, the LGP of the comparative example 2 that is made of the single layer structure of acrylate resin layer demonstrates easily cracked result.

Claims (3)

1. a LGP is made of acrylate resin layer and the polycarbonate resin that is laminated in this acrylate resin layer two sides.
2. LGP according to claim 1, described acrylate resin layer is formed by acrylic acid resin composition, described acrylic acid resin composition is with respect to acrylic resin 100 weight portions, and the malonate that is selected from that contains 0.001～1 weight portion is that ultra-violet absorber, oxanilide are that ultra-violet absorber and acetic acid esters are at least a kind of reagent in the ultra-violet absorber.
3. LGP according to claim 1 and 2, described polycarbonate resin is formed by poly carbonate resin composition, and described poly carbonate resin composition contains 0.01～1 parts by weight of acrylic resin with respect to polycarbonate resin 100 weight portions.
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