JP2002098808A - White laminated polyester film for reflecting member of planar light source - Google Patents
White laminated polyester film for reflecting member of planar light sourceInfo
- Publication number
- JP2002098808A JP2002098808A JP2000289940A JP2000289940A JP2002098808A JP 2002098808 A JP2002098808 A JP 2002098808A JP 2000289940 A JP2000289940 A JP 2000289940A JP 2000289940 A JP2000289940 A JP 2000289940A JP 2002098808 A JP2002098808 A JP 2002098808A
- Authority
- JP
- Japan
- Prior art keywords
- white
- film
- light source
- polyester
- polyester layer
- 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.)
- Pending
Links
- 229920006267 polyester film Polymers 0.000 title claims abstract description 46
- 229920000728 polyester Polymers 0.000 claims abstract description 99
- 239000010410 layer Substances 0.000 claims description 77
- 239000010419 fine particle Substances 0.000 claims description 22
- 239000004611 light stabiliser Substances 0.000 claims description 14
- 239000006081 fluorescent whitening agent Substances 0.000 claims description 5
- 239000002344 surface layer Substances 0.000 claims description 5
- 229920005992 thermoplastic resin Polymers 0.000 claims description 5
- 229920005672 polyolefin resin Polymers 0.000 claims description 3
- 239000012792 core layer Substances 0.000 claims 1
- 229920005989 resin Polymers 0.000 description 28
- 239000011347 resin Substances 0.000 description 28
- 238000000034 method Methods 0.000 description 25
- 239000004973 liquid crystal related substance Substances 0.000 description 19
- 239000003795 chemical substances by application Substances 0.000 description 15
- 239000002245 particle Substances 0.000 description 13
- 230000015572 biosynthetic process Effects 0.000 description 11
- 238000005286 illumination Methods 0.000 description 11
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- 238000005259 measurement Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000002994 raw material Substances 0.000 description 9
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- 229920000306 polymethylpentene Polymers 0.000 description 8
- 239000011116 polymethylpentene Substances 0.000 description 8
- 239000002131 composite material Substances 0.000 description 7
- 229920000139 polyethylene terephthalate Polymers 0.000 description 7
- 239000005020 polyethylene terephthalate Substances 0.000 description 7
- 239000002270 dispersing agent Substances 0.000 description 6
- 229920001223 polyethylene glycol Polymers 0.000 description 6
- 238000007639 printing Methods 0.000 description 6
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- 238000004040 coloring Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
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- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 4
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- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 4
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- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 4
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 3
- 239000012965 benzophenone Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 150000002009 diols Chemical class 0.000 description 3
- 239000000975 dye Substances 0.000 description 3
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- 150000001412 amines Chemical class 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 2
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- 229910000420 cerium oxide Inorganic materials 0.000 description 2
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- 238000005187 foaming Methods 0.000 description 2
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- 230000006872 improvement Effects 0.000 description 2
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 2
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000010445 mica Substances 0.000 description 2
- 229910052618 mica group Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 2
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 2
- 229920001515 polyalkylene glycol Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- YPFDHNVEDLHUCE-UHFFFAOYSA-N propane-1,3-diol Chemical compound OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 description 2
- 229960004889 salicylic acid Drugs 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000012321 sodium triacetoxyborohydride Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000012463 white pigment Substances 0.000 description 2
- 230000002087 whitening effect Effects 0.000 description 2
- 229910052984 zinc sulfide Inorganic materials 0.000 description 2
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 2
- FCKXGFANXSHGAW-DTXPUJKBSA-N (2s)-n,n'-bis[(2s)-1-(2-chloro-4-nitroanilino)-1-oxo-3-phenylpropan-2-yl]-2-hydroxybutanediamide Chemical compound C([C@H](NC(=O)C[C@H](O)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)NC=1C(=CC(=CC=1)[N+]([O-])=O)Cl)C(=O)NC=1C(=CC(=CC=1)[N+]([O-])=O)Cl)C1=CC=CC=C1 FCKXGFANXSHGAW-DTXPUJKBSA-N 0.000 description 1
- MEZZCSHVIGVWFI-UHFFFAOYSA-N 2,2'-Dihydroxy-4-methoxybenzophenone Chemical compound OC1=CC(OC)=CC=C1C(=O)C1=CC=CC=C1O MEZZCSHVIGVWFI-UHFFFAOYSA-N 0.000 description 1
- ZXDDPOHVAMWLBH-UHFFFAOYSA-N 2,4-Dihydroxybenzophenone Chemical compound OC1=CC(O)=CC=C1C(=O)C1=CC=CC=C1 ZXDDPOHVAMWLBH-UHFFFAOYSA-N 0.000 description 1
- LEVFXWNQQSSNAC-UHFFFAOYSA-N 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexoxyphenol Chemical compound OC1=CC(OCCCCCC)=CC=C1C1=NC(C=2C=CC=CC=2)=NC(C=2C=CC=CC=2)=N1 LEVFXWNQQSSNAC-UHFFFAOYSA-N 0.000 description 1
- ZMWRRFHBXARRRT-UHFFFAOYSA-N 2-(benzotriazol-2-yl)-4,6-bis(2-methylbutan-2-yl)phenol Chemical compound CCC(C)(C)C1=CC(C(C)(C)CC)=CC(N2N=C3C=CC=CC3=N2)=C1O ZMWRRFHBXARRRT-UHFFFAOYSA-N 0.000 description 1
- LHPPDQUVECZQSW-UHFFFAOYSA-N 2-(benzotriazol-2-yl)-4,6-ditert-butylphenol Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC(N2N=C3C=CC=CC3=N2)=C1O LHPPDQUVECZQSW-UHFFFAOYSA-N 0.000 description 1
- WXHVQMGINBSVAY-UHFFFAOYSA-N 2-(benzotriazol-2-yl)-4-tert-butylphenol Chemical compound CC(C)(C)C1=CC=C(O)C(N2N=C3C=CC=CC3=N2)=C1 WXHVQMGINBSVAY-UHFFFAOYSA-N 0.000 description 1
- VWDLBFIHDKGPLR-UHFFFAOYSA-N 2h-benzotriazole;[5-[(5-benzoyl-4-hydroxy-2-methoxyphenyl)methyl]-2-hydroxy-4-methoxyphenyl]-phenylmethanone Chemical compound C1=CC=CC2=NNN=C21.COC1=CC(O)=C(C(=O)C=2C=CC=CC=2)C=C1CC(C(=CC=1O)OC)=CC=1C(=O)C1=CC=CC=C1 VWDLBFIHDKGPLR-UHFFFAOYSA-N 0.000 description 1
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- UWSMKYBKUPAEJQ-UHFFFAOYSA-N 5-Chloro-2-(3,5-di-tert-butyl-2-hydroxyphenyl)-2H-benzotriazole Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC(N2N=C3C=C(Cl)C=CC3=N2)=C1O UWSMKYBKUPAEJQ-UHFFFAOYSA-N 0.000 description 1
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- 230000003595 spectral effect Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- CXVGEDCSTKKODG-UHFFFAOYSA-N sulisobenzone Chemical compound C1=C(S(O)(=O)=O)C(OC)=CC(O)=C1C(=O)C1=CC=CC=C1 CXVGEDCSTKKODG-UHFFFAOYSA-N 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- 239000000326 ultraviolet stabilizing agent Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- BOXSVZNGTQTENJ-UHFFFAOYSA-L zinc dibutyldithiocarbamate Chemical compound [Zn+2].CCCCN(C([S-])=S)CCCC.CCCCN(C([S-])=S)CCCC BOXSVZNGTQTENJ-UHFFFAOYSA-L 0.000 description 1
- PCHQDTOLHOFHHK-UHFFFAOYSA-L zinc;hydrogen carbonate Chemical compound [Zn+2].OC([O-])=O.OC([O-])=O PCHQDTOLHOFHHK-UHFFFAOYSA-L 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Optical Elements Other Than Lenses (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、白色積層ポリエス
テルフィルムに関するものである。更に詳しくは、液晶
画面用の光源としてサイドライト（エッジライトとも言
う）方式の面光源を用いた場合、該面光源用の反射板や
リフレクターとして最適な白色積層ポリエステルフィル
ムであって、より明るく、かつ耐久性にも優れた液晶画
面を得ることの出来る、面光源反射部材用白色積層ポリ
エステルフィルムに関するものである。TECHNICAL FIELD The present invention relates to a white laminated polyester film. More specifically, when a side light (also referred to as an edge light) type surface light source is used as a light source for a liquid crystal screen, it is a white laminated polyester film that is optimal as a reflector or reflector for the surface light source. The present invention relates to a white laminated polyester film for a surface light source reflecting member which can obtain a liquid crystal screen excellent in durability.
【０００２】[0002]
【従来の技術】液晶画面などの照明用器材として平板状
の面光源が一般に用いられるが、この面光源として、従
来はバックライト方式が採用されていた。しかし近年で
は、特開昭６３−６２１０４号公報に示されるようなサ
イドライト方式の面光源が、薄型で均一に照明できると
いうメリットを有することから、広く用いられるように
なっている。サイドライト方式とは、片面に網点印刷の
施されたアクリル板などの透明性基材の端部（エッジ）
より冷陰極線管などの照明光源からの光を当てる方式で
あり、別名エッジライト方式とも呼ばれている。この方
式では照明光源からの光が面光源の周囲へ逃げるのを防
止し、より効率的に液晶画面を照明する目的で、面光源
の背面側に反射板、さらに照明光源の周囲にリフレクタ
ーが設けられている。この反射板、リフレクターは共に
光反射機能を有するものであり、以降では両者を「面光
源反射部材」と総称する。2. Description of the Related Art A flat surface light source is generally used as a lighting device for a liquid crystal screen or the like, and a backlight system has conventionally been employed as the surface light source. However, in recent years, a side light type surface light source as disclosed in JP-A-63-62104 has been widely used because it has a merit of being thin and uniform. The sidelight method refers to the edge of a transparent substrate such as an acrylic plate with halftone printing on one side.
This is a method of applying light from an illumination light source such as a cold cathode ray tube, and is also called an edge light method. In this system, a reflector is provided on the back side of the surface light source, and a reflector is provided around the illumination light source to prevent light from the illumination light source from escaping around the surface light source and more efficiently illuminate the LCD screen. Have been. Both the reflection plate and the reflector have a light reflection function, and hereinafter both are collectively referred to as a "surface light source reflection member".
【０００３】サイドライト方式の面光源を用いた装置構
造の一例を図１を示す。図１において、片面に網点印刷
１６が施された透明性基材からなる透明導光板１５の片
面（網点印刷側）に反射板１１、他方の側に拡散板１
４、液晶画面１３が設けられ、さらに透明導光板１５の
端部に照明光源として冷陰極線管１７が配置される。ま
た、冷陰極線管１７の周囲にはリフレクター１２が設け
られる。以上がサイドライト方式の装置構造の概略であ
り、次にこの方式の基本原理を説明する。冷陰極線管１
７からの光は、直接に、またはリフレクター１２により
反射されて透明導光板１５の端部に入射光として導入さ
れる。該入射光は、網点印刷１６により均一に分散さ
れ、反射板１１により反射される。そして、この反射光
は再度、透明導光板１５を通り、さらに拡散板１４によ
り拡散されることによって液晶画面１３を明るく均一に
照らすのである。FIG. 1 shows an example of a device structure using a side light type surface light source. In FIG. 1, a transparent light guide plate 15 made of a transparent substrate having halftone printing 16 on one side has a reflecting plate 11 on one side (halftone printing side) and a diffusion plate 1 on the other side.
4. A liquid crystal screen 13 is provided, and a cold cathode ray tube 17 is arranged at an end of the transparent light guide plate 15 as an illumination light source. The reflector 12 is provided around the cold cathode ray tube 17. The above is the outline of the device structure of the sidelight system. Next, the basic principle of this system will be described. Cold cathode ray tube 1
The light from 7 is directly or reflected by the reflector 12 and introduced into the end of the transparent light guide plate 15 as incident light. The incident light is uniformly dispersed by the halftone printing 16 and is reflected by the reflection plate 11. Then, the reflected light passes through the transparent light guide plate 15 again and is further diffused by the diffusion plate 14, thereby illuminating the liquid crystal screen 13 brightly and uniformly.
【０００４】サイドライト方式では、照明光源が面光源
のエッジ側に設置されるため、背面側に該照明光源が設
置されるバックライト方式よりも薄型にできるという大
きな特長がある。[0004] In the sidelight system, since the illumination light source is installed on the edge side of the surface light source, there is a great feature that it can be made thinner than the backlight system in which the illumination light source is installed on the back side.
【０００５】上記の面光源反射部材には、第一に薄さと
光の高反射特性が要求されることから、従来より、白色
染料や白色顔料を添加したり、あるいは微細な気泡を含
有せしめる等の方法で光の反射特性を高めた白色フィル
ムが用いられてきた。特に、気泡による光の反射は基本
的に光の吸収がなく、また反射特性が乱反射（拡散反
射）であることから液晶画面をより明るく、かつ広く均
一に照らすことができる点で優れている。このような点
で、微細な気泡を含有する白色フィルムは面光源反射部
材として特に好ましいものである。上述の微細な気泡を
含有する白色フィルムとしては、例えば特開平６−３２
２１５３号公報、特開平７−１１８４３３号公報などに
開示されているものが挙げられる。[0005] The above-mentioned surface light source reflecting member is first required to have thinness and high light reflection characteristics. Therefore, conventionally, a white dye or a white pigment is added, or fine bubbles are contained. A white film having improved light reflection characteristics by the method described above has been used. In particular, the reflection of light by bubbles is excellent in that the liquid crystal screen can be illuminated more brightly and uniformly evenly because the light is basically not absorbed and the reflection characteristic is irregular reflection (diffuse reflection). From such a point, a white film containing fine bubbles is particularly preferable as a surface light source reflecting member. Examples of the white film containing fine bubbles described above include, for example, JP-A-6-32
No. 2,153, JP-A-7-118433, and the like.
【０００６】[0006]
【発明が解決しようとする課題】ところで、液晶画面の
用途は、従来からのノート型パソコンに加えて、近年で
は据置型のパソコンやテレビ、携帯電話のディスプレイ
など、様々な機器に採用されており、需要は急速に増大
している。一方、液晶画面の画像もより高精細なものが
求められるのに伴い、液晶画面の明るさを増して画像を
より鮮明に、より見やすくする改良が進められており、
照明光源（例えば、冷陰極線管）もより高輝度、高出力
のものとなってきている。しかしながら、面光源反射部
材である反射板やリフレクターとして上記フィルムを用
いた場合には、長期間使用していると照明光源の光によ
りフィルムが次第に劣化して黄味がかった色になり、つ
いには光の反射特性が低下して液晶画面の明るさが不十
分となる問題が指摘されており、白色フィルムの耐光性
向上が強く求められている。By the way, liquid crystal screens have been used in various devices such as stationary personal computers, televisions and displays of mobile phones in recent years, in addition to conventional notebook personal computers. , Demand is growing rapidly. On the other hand, with the demand for higher-definition images on the LCD screen, improvements have been made to increase the brightness of the LCD screen to make the images clearer and easier to see,
Illumination light sources (for example, cold-cathode ray tubes) have become higher in brightness and higher in output. However, when the above film is used as a reflector or a reflector that is a surface light source reflecting member, the film gradually deteriorates to yellowish color due to the light of the illumination light source when used for a long time, and finally, It has been pointed out that a problem arises in that the brightness of the liquid crystal screen becomes insufficient due to a decrease in the light reflection characteristics, and an improvement in the light resistance of a white film is strongly demanded.
【０００７】耐光性を改良しようとして、例えば、耐光
剤を単膜のフィルム中、あるいは複合フィルムの表層中
に添加した場合、照明光源からの光および／または熱を
直接、長期間受けた後では耐光剤が表面にブリードアウ
トすることによって反射特性が低下し、面光源反射部材
に用いても十分な面光源反射輝度が得難いという問題が
ある。あるいはまた、用いる耐光剤によっては、製膜時
にその耐光剤成分が、ドラム、ロール、電極（ドラム上
に押出成形してフィルム化する際、密着冷却固化させる
ための静電気印加素線）等を汚染することがあるという
問題もある。In order to improve the light fastness, for example, when a light fastening agent is added to a single film or a surface layer of a composite film, the light and / or heat from the illumination light source is not directly applied for a long period of time. Bleed-out of the light stabilizer on the surface lowers the reflection characteristics, and it is difficult to obtain sufficient surface light source reflection luminance even when used as a surface light source reflection member. Alternatively, depending on the light-resistant agent used, the light-resistant agent component contaminates drums, rolls, electrodes (electrostatic wires for tightly cooling and solidifying when extruded onto a drum to form a film) during film formation. There is also a problem that it may be done.
【０００８】本発明は、以上のような問題点を全て解決
すること、すなわち、高度の耐光性を保持し、しかも優
れた反射特性を有する面光源反射部材用白色積層ポリエ
ステルフィルムを提供することを目的とする。The present invention is to solve all of the above problems, that is, to provide a white laminated polyester film for a surface light source reflecting member having high light resistance and excellent reflection characteristics. Aim.
【０００９】[0009]
【課題を解決するための手段】この目的を達成するため
の、本発明の面光源反射部材用白色積層ポリエステルフ
ィルムは、微細な気泡を含有する白色ポリエステル層
（Ｂ）の少なくとも片面に白色ポリエステル層（Ａ）を
有する２層以上の白色積層ポリエステルフィルムであっ
て、該白色ポリエステル層（Ｂ）が耐光剤を含有して成
ることを特徴とする。In order to achieve this object, a white laminated polyester film for a surface light source reflecting member according to the present invention comprises a white polyester layer (B) containing fine bubbles on at least one side of the white polyester layer (B). (A) Two or more white laminated polyester films having (A), wherein the white polyester layer (B) contains a light stabilizer.
【００１０】[0010]
【発明の実施の形態】本発明において、ポリエステルと
は、ジオールとジカルボン酸とから縮重合によって得ら
れるポリマーであり、ジカルボン酸は、テレフタル酸、
イソフタル酸、フタル酸、ナフタレンジカルボン酸、ア
ジピン酸、セバシン酸等で代表されるものであり、また
ジオールは、エチレングリコール、トリメチレングリコ
ール、テトラメチレングリコール、シクロヘキサンジメ
タノール等で代表されるものである。具体的には例え
ば、ポリエチレンテレフタレート、ポリエチレン−ｐ−
オキシベンゾエート、ポリ−１，４−シクロヘキシレン
ジメチレンテレフタレート、ポリエチレン−２，６−ナ
フタレンジカルボキシレート（ポリエチレンナフタレー
ト）等を使用することができる。DETAILED DESCRIPTION OF THE INVENTION In the present invention, a polyester is a polymer obtained by condensation polymerization of a diol and a dicarboxylic acid, and the dicarboxylic acid is terephthalic acid,
Isophthalic acid, phthalic acid, naphthalenedicarboxylic acid, adipic acid, sebacic acid and the like, and diols are represented by ethylene glycol, trimethylene glycol, tetramethylene glycol, cyclohexane dimethanol, and the like. . Specifically, for example, polyethylene terephthalate, polyethylene-p-
Oxybenzoate, poly-1,4-cyclohexylene dimethylene terephthalate, polyethylene-2,6-naphthalenedicarboxylate (polyethylene naphthalate) and the like can be used.
【００１１】もちろん、これらのポリエステルは、ホモ
ポリエステルであっても、コポリエステルであってもよ
く、共重合成分として、例えば、ジエチレングリコー
ル、ネオペンチルグリコール、ポリアルキレングリコー
ル等のジオール成分、アジピン酸、セバシン酸、フタル
酸、イソフタル酸、２，６−ナフタレンジカルボン酸、
５−ナトリウムスルホイソフタル酸等のジカルボン酸成
分を用いることもできる。また、このポリエステルの中
には、必要に応じて、本発明の効果が損なわれない量で
適宜な添加剤、例えば耐熱安定剤、耐酸化安定剤、有機
の易滑剤、有機系微粒子、充填剤、帯電防止剤、核剤、
染料、分散剤、カップリング剤等が配合されていてもよ
い。Of course, these polyesters may be homopolyesters or copolyesters. Examples of copolymerization components include diol components such as diethylene glycol, neopentyl glycol and polyalkylene glycol, adipic acid, sebacine and the like. Acid, phthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid,
A dicarboxylic acid component such as 5-sodium sulfoisophthalic acid can also be used. Also, in this polyester, if necessary, suitable additives in an amount that does not impair the effects of the present invention, such as heat stabilizers, oxidation stabilizers, organic lubricants, organic fine particles, fillers , Antistatic agent, nucleating agent,
Dyes, dispersants, coupling agents and the like may be blended.
【００１２】本発明に用いられるポリエステルとして
は、ポリエチレンテレフタレート、ポリエチレンナフタ
レートが耐水性、耐久性、耐薬品性等に優れているた
め、特に好ましいものである。As the polyester used in the present invention, polyethylene terephthalate and polyethylene naphthalate are particularly preferable because of their excellent water resistance, durability and chemical resistance.
【００１３】本発明の白色積層ポリエステルフィルム
は、微細な気泡を含有する白色ポリエステル層（Ｂ）の
少なくとも片面に白色ポリエステル層（Ａ）を有する２
層以上の積層構成としたものであって、特に白色ポリエ
ステル層（Ｂ）が耐光剤を含有して成ることが必要であ
る。耐光剤を含有することにより、本発明の白色積層ポ
リエステルフィルムの耐光性が著しく向上し、面光源反
射部材である反射板やリフレクターとして長期間使用さ
れた場合でも液晶画面の明るさは初期の状態を保ち、画
像がより鮮明で見やすい優れた液晶画面を得ることがで
きるのである。The white laminated polyester film of the present invention comprises a white polyester layer (B) containing fine bubbles and a white polyester layer (A) on at least one surface.
The white polyester layer (B) needs to contain a light-proofing agent in particular. By containing a light stabilizer, the light resistance of the white laminated polyester film of the present invention is significantly improved, and the brightness of the liquid crystal screen is in the initial state even when used for a long time as a reflector or reflector as a surface light source reflection member. , And an excellent liquid crystal screen with clearer images and easier to see can be obtained.
【００１４】本発明における耐光剤の含有量は、０．０
５〜１０重量％であることが好ましく、より好ましくは
０．１〜５重量％、更には０．１５〜３重量％であるこ
とが最も好ましい。耐光剤の含有量が０．０５重量％未
満の場合には、耐光性が不十分となり、長期間使用して
いる間にフィルムが劣化して、その反射特性が低下しや
すくなる問題がある。一方、１０重量％を超える場合に
は、耐光剤による着色によって反射特性が低下すること
があり、好ましくない。In the present invention, the content of the light stabilizer is 0.0
It is preferably from 5 to 10% by weight, more preferably from 0.1 to 5% by weight, and most preferably from 0.15 to 3% by weight. When the content of the light stabilizer is less than 0.05% by weight, the light resistance becomes insufficient, and there is a problem that the film deteriorates during long-term use, and the reflection characteristics thereof are apt to deteriorate. On the other hand, if it exceeds 10% by weight, the reflection characteristics may be deteriorated due to coloring by the light-proofing agent, which is not preferable.
【００１５】本発明で使用する耐光剤は、耐熱性に優
れ、前述のポリエステルとの相溶性がよく均一分散でき
ると共に、着色が少なく樹脂およびフィルムの反射特性
に悪影響を及ぼさないものの選択が望ましい。先の条件
を満たす耐光剤であれば特に限定されないが、例えば、
サリチル酸系、ベンゾフェノン系、ベンゾトリアゾール
系、シアノアクリレート系等の紫外線吸収剤、ヒンダー
ドアミン系等の紫外線安定剤の各種のものが適用可能で
ある。より具体的な適用例は以下のとおりである。 （紫外線吸収剤） サリチル酸系：ｐ−ｔ−ブチルフェニルサリシレート、
ｐ−オクチルフェニルサリシレート ベンゾフェノン系：２，４−ジヒドロキシベンゾフェノ
ン、２−ヒドロキシ−４−メトキシベンゾフェノン、２
−ヒドロキシ−４−メトキシ−５−スルホベンゾフェノ
ン、２，２’−４，４’−テトラヒドロキシベンゾフェ
ノン、２，２’−ジヒドロキシ−４−メトキシベンゾフ
ェノン、２，２’−ジヒドロキシ−４，４’−ジメトキ
シベンゾフェノン、ビス（２−メトキシ−４−ヒドロキ
シ−５−ベンゾイルフェニル）メタン ベンゾトリアゾール系：２−（２’−ヒドロキシ−５’
−メチルフェニル）ベンゾトリアゾール、２−（２’−
ヒドロキシ−５’−ｔ−ブチルフェニル）ベンゾトリア
ゾール、２−（２’−ヒドロキシ−３’，５’−ジ−ｔ
−ブチルフェニル）ベンゾトリアゾール、２−（２’−
ヒドロキシ−３’−ｔ−ブチル−５’−メチルフェニ
ル）−５−クロロベンゾトリアゾール、２−（２’−ヒ
ドロキシ−３’，５’−ジ・ｔ−ブチルフェニル）−５
−クロロベンゾトリアゾール、２−（２’−ヒドロキシ
−５’−ｔ−オクチルフェノール）ベンゾトリアゾー
ル、２−（２’−ヒドロキシ−３’，５’−ジ・ｔ−ア
ミルフェニル）ベンゾトリアゾール、２，２’−メチレ
ンビス［４−（１，１，３，３−テトラメチルブチル）
−６−（２Ｈ−ベンゾトリアゾール−２−イル）フェノ
ール］、２（２’ヒドロキシ−５’−メタアクリロキシ
フェニル）−２Ｈ−ベンゾトリアゾール、２−［２’−
ヒドロキシ−３’−（３″，４″，５″，６″−テトラ
ヒドロフタルイミドメチル）−５’−メチルフェニル］
ベンゾトリアゾール シアノアクリレート系：エチル−２−シアノ−３，３’
−ジフェニルアクリレート 上記以外：２−エトキシ−２’−エチルオキザックアシ
ッドビスアニリド、２−（４，６−ジフェニル−１，
３，５−トリアジン−２−イル）−５−［（ヘキシル）
オキシ］−フェノール （紫外線安定剤） ヒンダードアミン系：ビス（２，２，６，６−テトラメ
チル−４−ピペリジル）セバケート、コハク酸ジメチル
・１−（２−ヒドロキシエチル）−４−ヒドロキシ−
２，２，６，６−テトラメチルピペリジン重縮合物 上記以外：ニッケルビス（オクチルフェニル）サルファ
イド、［２−チオビス（４−ｔーオクチルフェノラー
ト）］−ｎ−ブチルアミンニッケル、ニッケルコンプレ
ックス−３，５−ジ・ｔ−ブチル−４−ヒドロキシベン
ジル・リン酸モノエチレート、ニッケル・ジブチルジチ
オカーバメート、２，４−ジ−ｔ−ブチルフェニル−
３’，５’−ジ・ｔ−ブチル−４’−ヒドロキシベンゾ
エート、２，４−ジ・ｔ−ブチルフェニル−３’，５’
−ジ・ｔ−ブチル−４’−ハイドロキシベンゾエート これらの耐光剤の中でも、ポリエステルとの相溶性に優
れる２，２’，４，４’−テトラヒドロキシ−ベンゾフ
ェノン、ビス（２−メトキシ−４−ヒドロキシ−５−ベ
ンゾイルフェニル）メタン、２，２’−メチレンビス
［４−（１，１，３，３−テトラメチルブチル）−６−
（２Ｈ−ベンゾトリアゾール−２−イル）フェノー
ル］、２−（４，６−ジフェニル−１，３，５−トリア
ジン−２−イル）−５−［（ヘキシル）オキシ］−フェ
ノールの適用が好ましい。上記の耐光剤は、単独でも２
種以上の併用であってもよい。The light stabilizer used in the present invention is preferably selected from those which have excellent heat resistance, have good compatibility with the above-mentioned polyester, can be uniformly dispersed, and have little coloring and do not adversely affect the reflection characteristics of the resin and the film. There is no particular limitation as long as it is a light stabilizer that satisfies the above conditions, for example,
Various types of ultraviolet absorbers such as salicylic acid, benzophenone, benzotriazole and cyanoacrylate, and ultraviolet stabilizers such as hindered amine are applicable. More specific application examples are as follows. (Ultraviolet absorber) Salicylic acid: pt-butylphenyl salicylate,
p-octylphenyl salicylate benzophenone: 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2
-Hydroxy-4-methoxy-5-sulfobenzophenone, 2,2'-4,4'-tetrahydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'- Dimethoxybenzophenone, bis (2-methoxy-4-hydroxy-5-benzoylphenyl) methane benzotriazole: 2- (2′-hydroxy-5 ′)
-Methylphenyl) benzotriazole, 2- (2'-
Hydroxy-5'-t-butylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'-di-t
-Butylphenyl) benzotriazole, 2- (2'-
(Hydroxy-3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3 ', 5'-di-t-butylphenyl) -5
-Chlorobenzotriazole, 2- (2'-hydroxy-5'-t-octylphenol) benzotriazole, 2- (2'-hydroxy-3 ', 5'-di-t-amylphenyl) benzotriazole, 2,2 '-Methylenebis [4- (1,1,3,3-tetramethylbutyl)
-6- (2H-benzotriazol-2-yl) phenol], 2 (2'hydroxy-5'-methacryloxyphenyl) -2H-benzotriazole, 2- [2'-
Hydroxy-3 '-(3 ", 4", 5 ", 6" -tetrahydrophthalimidomethyl) -5'-methylphenyl]
Benzotriazole cyanoacrylate: ethyl-2-cyano-3,3 '
-Diphenyl acrylate Other than the above: 2-ethoxy-2'-ethyloxazac acid bisanilide, 2- (4,6-diphenyl-1,2
3,5-triazin-2-yl) -5-[(hexyl)
Oxy] -phenol (UV stabilizer) Hindered amine: bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, dimethyl succinate-1- (2-hydroxyethyl) -4-hydroxy-
2,2,6,6-tetramethylpiperidine polycondensate Other than above: nickel bis (octylphenyl) sulfide, [2-thiobis (4-t-octylphenolate)]-n-butylamine nickel, nickel complex-3, 5-di-t-butyl-4-hydroxybenzyl phosphate monoethylate, nickel dibutyl dithiocarbamate, 2,4-di-t-butylphenyl-
3 ', 5'-di-t-butyl-4'-hydroxybenzoate, 2,4-di-t-butylphenyl-3', 5 '
-Di-t-butyl-4'-hydroxybenzoate Among these light stabilizers, 2,2 ', 4,4'-tetrahydroxy-benzophenone and bis (2-methoxy-4-hydroxy), which are excellent in compatibility with polyester. -5-benzoylphenyl) methane, 2,2'-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6
(2H-benzotriazol-2-yl) phenol] and 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol are preferred. The above light stabilizers are used alone or
More than one kind may be used in combination.
【００１６】本発明の白色ポリエステル層（Ｂ）は、ポ
リエステルからなる層中に微細な気泡を含有せしめて白
色化した層である。微細な気泡を含有せしめる方法とし
ては、発泡剤を含有せしめ、押出や製膜時の加熱によ
り発泡、あるいは化学的分解により発泡させて気泡を形
成する方法、押出時にガスまたは気化可能物質を添加
する方法、ポリエステルに対し非相溶性の熱可塑性樹
脂（非相溶樹脂）を添加し、それを一軸または二軸延伸
することにより微細な気泡を発生させる方法、前記の
非相溶樹脂の代わりに気泡形成性の無機系微粒子を多量
添加する方法等が一般に用いられる。本発明の目的の範
囲内であれば、いずれの方法を用いてもよいが、これら
の方法の中でも製膜性、内部に含有せしめる気泡の量の
調整しやすさ、より微細で均一な大きさの気泡の形成し
やすさ、さらに軽量性などの総合的な点から非相溶樹
脂の使用が特に好ましい。The white polyester layer (B) of the present invention is a whitened layer in which fine bubbles are contained in a layer made of polyester. As a method of containing fine bubbles, a method of containing a foaming agent, foaming by heating during extrusion or film formation, or foaming by chemical decomposition to form bubbles, adding a gas or a vaporizable substance at the time of extrusion Method, a method of adding a thermoplastic resin (incompatible resin) which is incompatible with polyester and uniaxially or biaxially stretching the same to generate fine air bubbles, instead of the above incompatible resin, air bubbles A method of adding a large amount of inorganic fine particles having formability is generally used. Any method may be used as long as it is within the range of the object of the present invention, but among these methods, the film forming property, the ease of adjusting the amount of bubbles contained therein, the finer and uniform size It is particularly preferable to use an immiscible resin from the viewpoints of easy formation of air bubbles and lightness.
【００１７】本発明における気泡とは、上述したように
フィルムへの反射特性（乱反射）付与に寄与することの
できるものを言うのであって、具体的には、ポリエステ
ル中に含有せしめた該非相溶樹脂を核として生成された
ものであることが好ましい。さらに具体的には、白色ポ
リエステル層（Ｂ）の断面（厚み方向）を走査型電子顕
微鏡（ＳＥＭ）または透過型電子顕微鏡（ＴＥＭ）など
によって観察したとき、気泡部分の断面積の平均値が
０．５〜２５μｍ2にあるものが好ましく、更には１〜
２０μｍ2の範囲内にあるものがより好ましい。The bubbles in the present invention refer to those which can contribute to imparting reflection characteristics (irregular reflection) to a film as described above. Specifically, the incompatible fibers contained in polyester are used. It is preferable that the resin is generated using a resin as a core. More specifically, when the cross section (the thickness direction) of the white polyester layer (B) is observed by a scanning electron microscope (SEM) or a transmission electron microscope (TEM), the average value of the cross-sectional area of the bubble portion is 0. It is preferably from 0.5 to 25 μm 2, and more preferably from 1 to 25 μm 2 .
Those having a range of 20 μm 2 are more preferable.
【００１８】本発明でいう非相溶樹脂とは、ポリエステ
ル以外の熱可塑性樹脂であって、かつ該ポリエステルに
対して非相溶性を示す熱可塑性樹脂であり、ポリエステ
ル中では粒子状に分散し、延伸によりフィルム中に気泡
を形成せしめる効果が大きい。より具体的に述べれば、
示差走査熱量計（ＤＳＣ）等を用いた公知の方法での測
定において、ポリエステルと上記非相溶樹脂とを溶融し
た系において、ポリエステルに相当するガラス転移温度
（以降、Ｔｇと省略する）以外に該非相溶樹脂に相当す
るＴｇが観察される樹脂である。The immiscible resin referred to in the present invention is a thermoplastic resin other than polyester and a thermoplastic resin having incompatibility with the polyester. The effect of forming bubbles in the film by stretching is great. More specifically,
In a measurement by a known method using a differential scanning calorimeter (DSC) or the like, in a system in which a polyester and the above incompatible resin are melted, in addition to a glass transition temperature (hereinafter abbreviated as Tg) corresponding to the polyester. This is a resin in which Tg corresponding to the incompatible resin is observed.
【００１９】このような非相溶樹脂の融点は、ポリエス
テルの融点よりも低温であって、かつ製膜時にフィルム
を熱固定して配向させる際の温度（熱処理温度）よりも
高温であることが好ましい。かかる点から該非相溶樹脂
の中でも、ポリエチレン、ポリプロピレン、ポリブテ
ン、ポリメチルペンテンのようなポリオレフィン樹脂、
ポリスチレン樹脂、ポリアクリレート樹脂、ポリカーボ
ネート樹脂、ポリアクリロニトリル樹脂、ポリフェニレ
ンスルフィド樹脂、フッ素系樹脂などが好ましく用いら
れる。これらは単独重合体であっても共重合体であって
もよく、さらには２種以上の非相溶樹脂を併用してもよ
い。これらの中でも、臨界表面張力の小さなポリプロピ
レン、ポリメチルペンテンのようなポリオレフィン樹脂
が好ましく、さらにはポリメチルペンテンが最も好まし
い。該ポリメチルペンテンは相対的にポリエステルとの
表面張力差が大きく、かつ融点が高いため、含有量当た
りの気泡形成の効果が大きいという特徴があり、非相溶
樹脂として特に好ましいものである。The melting point of such an incompatible resin may be lower than the melting point of the polyester and higher than the temperature at which the film is heat-fixed and oriented during the film formation (heat treatment temperature). preferable. From this point, among the incompatible resins, polyethylene, polypropylene, polybutene, polyolefin resins such as polymethylpentene,
Polystyrene resins, polyacrylate resins, polycarbonate resins, polyacrylonitrile resins, polyphenylene sulfide resins, fluorine-based resins, and the like are preferably used. These may be a homopolymer or a copolymer, and two or more incompatible resins may be used in combination. Among these, polyolefin resins such as polypropylene and polymethylpentene having a small critical surface tension are preferable, and polymethylpentene is most preferable. Since polymethylpentene has a relatively large difference in surface tension from polyester and a high melting point, it has a feature that the effect of forming bubbles per content is large, and is particularly preferable as an incompatible resin.
【００２０】白色ポリエステル層（Ｂ）中の非相溶樹脂
の含有量は特に限定されないが１〜３５重量％が好まし
く、より好ましくは２〜３０重量％、さらには３〜２５
重量％の範囲内であることが最も好ましい。含有量が上
記範囲より少ない場合にはフィルムの反射特性や隠蔽性
などを向上させることが難しく、逆に上記範囲より多い
場合には延伸時にフィルム破れ等が生じやすくなって、
生産性が低下する場合がある。The content of the incompatible resin in the white polyester layer (B) is not particularly limited, but is preferably 1 to 35% by weight, more preferably 2 to 30% by weight, and further preferably 3 to 25% by weight.
Most preferably, it is in the range of weight percent. If the content is less than the above range, it is difficult to improve the reflection characteristics and concealing properties of the film, and if the content is more than the above range, the film tends to be broken at the time of stretching,
Productivity may decrease.
【００２１】本発明においては、上述のポリエステルと
非相溶樹脂に、さらに分散剤を含有せしめることは、非
相溶樹脂の分散径が小さくなり、ひいては延伸により発
生する気泡をより微細化でき、結果的にフィルムの反射
特性を向上させることができるので、より好ましいもの
である。上記の効果を示す分散剤としては、カルボキシ
ル基やエポキシ基等の極性基やポリエステルと反応性の
ある官能基をもったオレフィン系の重合体または共重合
体、ポリアルキレングリコール、界面活性剤、熱接着性
樹脂等を用いることができる。もちろん、これらは単独
でも２種以上を併用してもよい。分散剤を添加する方法
としては、ポリエステルとの混合であるブレンド化や、
ランダム共重合、ブロック共重合などの共重合化が採用
できる。また両者の中間状態である部分共重合化であっ
てもよい。In the present invention, by further adding a dispersant to the above-mentioned polyester and the incompatible resin, the dispersion diameter of the incompatible resin can be reduced, and the bubbles generated by stretching can be further reduced. As a result, the reflection characteristics of the film can be improved, which is more preferable. Examples of the dispersant exhibiting the above effects include olefin polymers or copolymers having a polar group such as a carboxyl group or an epoxy group or a functional group reactive with polyester, polyalkylene glycol, a surfactant, An adhesive resin or the like can be used. Of course, these may be used alone or in combination of two or more. As a method of adding a dispersant, blending that is a mixture with a polyester,
Copolymerization such as random copolymerization and block copolymerization can be employed. Further, partial copolymerization, which is an intermediate state between the two, may be used.
【００２２】本発明における分散剤の含有量は、０．０
５〜１０重量％が好ましく、より好ましくは０．１〜７
重量％、最も好ましくは０．２〜５重量％である。含有
量が０．０５重量％より少ない場合、気泡を微細化する
効果が小さい。また、１０重量％より多い場合には、逆
に非相溶樹脂を添加する効果が小さくなり、反射特性の
低下やコスト上昇などの問題が発生しやすい。In the present invention, the content of the dispersant is 0.0
It is preferably 5 to 10% by weight, more preferably 0.1 to 7% by weight.
%, Most preferably 0.2-5% by weight. When the content is less than 0.05% by weight, the effect of making air bubbles fine is small. On the other hand, when the content is more than 10% by weight, the effect of adding the incompatible resin becomes small, and problems such as a decrease in reflection characteristics and an increase in cost are likely to occur.
【００２３】本発明においては、白色ポリエステル層
（Ａ）を白色化する方法として、白色染料、白色顔料、
無機系微粒子などを添加する方法が用いられるが、表面
の光沢度、経時での安定性、製膜性などの点で無機系微
粒子を含有せしめることが好ましい。該無機系微粒子
は、気泡形成性を有していても、有していなくてもよ
く、その一例としては、炭酸カルシウム、炭酸マグネシ
ウム、炭酸バリウム、炭酸亜鉛、塩基性炭酸鉛（鉛
白）、酸化チタン、酸化亜鉛（亜鉛華）、酸化アンチモ
ン、酸化セリウム、酸化ジルコニウム、酸化錫、酸化ラ
ンタン、酸化マグネシウム、硫酸バリウム、硫酸カルシ
ウム、硫酸鉛、硫化亜鉛、リン酸カルシウム、シリカ、
アルミナ、マイカ、雲母チタン、タルク、クレー、カオ
リン、フッ化リチウム、フッ化カルシウム等を用いるこ
とができる。無機系微粒子の気泡形成性は、ポリエステ
ルとの表面張力差以外にも、平均粒子径や凝集性などに
も依存するが、気泡形成性を有する無機系微粒子の代表
的なものとしては、炭酸カルシウム、硫酸バリウム、炭
酸マグネシウムなどである。一方、気泡形成性を有しな
い無機系微粒子とは、主にポリエステルとの屈折率差に
よってフィルムを白色化せしめるものであって、その代
表例は、酸化チタン、硫化亜鉛、酸化亜鉛、酸化セリウ
ムなどである。これらの無機系微粒子は単独でも２種以
上を併用してもよい。また、該無機系微粒子は多孔質や
中空多孔質等の形態であってもよく、さらには本発明の
効果を阻害しない範囲内において、樹脂に対する分散性
を向上させるために、さらに表面処理が施されていても
よい。In the present invention, as a method for whitening the white polyester layer (A), a white dye, a white pigment,
Although a method of adding inorganic fine particles is used, it is preferable to add inorganic fine particles in terms of surface glossiness, stability over time, film forming property, and the like. The inorganic fine particles may or may not have bubble-forming properties, and examples thereof include calcium carbonate, magnesium carbonate, barium carbonate, zinc carbonate, basic lead carbonate (lead white), Titanium oxide, zinc oxide (zinc white), antimony oxide, cerium oxide, zirconium oxide, tin oxide, lanthanum oxide, magnesium oxide, barium sulfate, calcium sulfate, lead sulfate, zinc sulfide, calcium phosphate, silica,
Alumina, mica, titanium mica, talc, clay, kaolin, lithium fluoride, calcium fluoride and the like can be used. The bubble-forming property of the inorganic fine particles depends not only on the difference in surface tension from the polyester but also on the average particle size and the cohesiveness. Typical examples of the inorganic fine particles having a bubble-forming property include calcium carbonate. , Barium sulfate, magnesium carbonate and the like. On the other hand, inorganic fine particles that do not have bubble-forming properties are those that whiten a film mainly due to the difference in refractive index from polyester, and typical examples thereof include titanium oxide, zinc sulfide, zinc oxide, and cerium oxide. It is. These inorganic fine particles may be used alone or in combination of two or more. The inorganic fine particles may be in the form of a porous or hollow porous material. Further, as long as the effects of the present invention are not impaired, the inorganic fine particles may be further subjected to a surface treatment in order to improve dispersibility in the resin. It may be.
【００２４】また、本発明における無機系微粒子は、ポ
リエステル中での平均粒子径が０．０５〜３μｍである
ことが好ましく、より好ましくは０．０７〜１μｍであ
る。該平均粒子径が上記範囲外である場合、凝集などに
よる無機系微粒子の均一分散性不良によって反射特性が
低下したり、あるいは表面での乱反射（拡散反射）特性
が低下して、観る角度によって液晶画面の明るさにムラ
が発生する場合があるので好ましくない。また、無機系
微粒子の含有量は、特に限定されないが、１〜４０重量
％が好ましく、より好ましくは３〜３５重量％、さらに
は５〜３０重量％の範囲にあるものが最も好ましい。含
有量が上記範囲より少ない場合にはフィルムの反射率な
どの特性を向上させることが難しく、逆に上記範囲より
多い場合には延伸時にフィルム破れや、後加工の際に粉
発生等の不都合を生じる場合がある。The inorganic fine particles of the present invention preferably have an average particle size in the polyester of 0.05 to 3 μm, more preferably 0.07 to 1 μm. When the average particle size is outside the above range, the reflection characteristics are deteriorated due to poor uniform dispersibility of the inorganic fine particles due to aggregation or the like, or the irregular reflection (diffuse reflection) characteristics on the surface are reduced. This is not preferable because unevenness may occur in the brightness of the screen. The content of the inorganic fine particles is not particularly limited, but is preferably 1 to 40% by weight, more preferably 3 to 35% by weight, and most preferably 5 to 30% by weight. If the content is less than the above range, it is difficult to improve the properties such as the reflectance of the film.If the content is more than the above range, the film breaks during stretching, and disadvantages such as powder generation during post-processing are caused. May occur.
【００２５】本発明では、面光源反射部材用白色積層ポ
リエステルフィルムに、より高度な反射特性を与えるた
めに白色ポリエステル層（Ａ）および／または白色ポリ
エステル層（Ｂ）に蛍光増白剤を含有せしめることが望
ましい。In the present invention, a fluorescent whitening agent is added to the white polyester layer (A) and / or the white polyester layer (B) in order to give the white laminated polyester film for the surface light source reflecting member higher reflective properties. It is desirable.
【００２６】本発明において、蛍光増白剤とは、太陽光
中や人工光中の紫外線を吸収し、これを紫〜青色の可視
光線に変え輻射する機能を保持し、その蛍光作用により
高分子物質の明度を低下させることなく白度を助長させ
る化合物である。蛍光増白剤としては、商品名“ユビテ
ック”（チバガイギー社）、“ＯＢ−１”（イーストマ
ン社）、“ＴＢＯ”（住友精化（株））、“ケイコー
ル”（日本曹達（株））、“カヤライト”（日本化薬
（株））、“リューコプア”ＥＧＭ（クライアントジャ
パン（株））等を用いることができる。蛍光増白剤は、
特に限定されるものではなく、単独、場合によっては２
種以上の併用であってもよいが、本発明では、特に耐熱
性に優れ、前述ポリエステルとの相溶性がよく均一分散
できると共に、着色が少なく、樹脂に悪影響を及ぼさな
いものの選択が望ましい。In the present invention, a fluorescent whitening agent is a polymer that absorbs ultraviolet light in sunlight or artificial light, converts the ultraviolet light into visible light of violet to blue, and radiates it. A compound that promotes whiteness without reducing the lightness of the substance. Examples of the fluorescent whitening agent include trade names "Ubitek" (Ciba-Geigy), "OB-1" (Eastman), "TBO" (Sumitomo Seika Co., Ltd.) and "Kay Coal" (Nippon Soda Co., Ltd.). , "Kayalite" (Nippon Kayaku Co., Ltd.), "Ryukopua" EGM (Client Japan Co., Ltd.) and the like can be used. The optical brightener is
There is no particular limitation.
More than one kind may be used in combination, but in the present invention, it is desirable to select one which is particularly excellent in heat resistance, has good compatibility with the polyester described above, can be uniformly dispersed, has little coloring, and does not adversely affect the resin.
【００２７】白色ポリエステル層（Ａ）あるいは白色ポ
リエステル層（Ｂ）中における蛍光増白剤の含有量は、
０．００５〜１重量％が好ましく、０．０５〜０．５重
量％の範囲にあるものがより好ましい。含有量が上記範
囲より少ないと充分な増白効果が得にくく、上記範囲を
越えるものは均一分散性の低下や着色により、かえって
反射特性、耐光性が低下しやすくなる等の問題がある。The content of the fluorescent whitening agent in the white polyester layer (A) or the white polyester layer (B) is as follows:
It is preferably 0.005 to 1% by weight, more preferably 0.05 to 0.5% by weight. When the content is less than the above range, it is difficult to obtain a sufficient whitening effect, and when the content exceeds the above range, there is a problem that the reflection property and the light resistance are liable to be lowered due to a decrease in uniform dispersibility and coloring.
【００２８】本発明の白色積層ポリエステルフィルム
は、白色ポリエステル層（Ｂ）の少なくとも片面に白色
ポリエステル層（Ａ）を有する２層以上の積層構成とす
る必要がある。例えば、１層の単膜フィルムにより、本
発明の効果を得ようとする場合、フィルム破れが発生し
やすく、製膜が不安定なため、結果的にコストが高くな
ることがある。また、微細な気泡を含有せしめるため非
相溶樹脂を添加した場合、その種類によっては分散して
いる粒子状の非相溶樹脂が脱落し、長時間製膜している
間に製膜装置と接触する部分（ドラム、ロールなど）を
汚染することがある。また、この汚染がフィルム特性に
好ましくない影響を与えたり、対策として定期的に洗浄
を行うことで生産性の低下やコスト上昇を招くことにな
るなどの問題が発生したりすることがある。さらには、
耐光剤による着色などの問題も発生しやすくなる。そこ
で、２層以上の積層構成とし、白色ポリエステル層
（Ｂ）に耐光性と微細な気泡による反射特性を発現さ
せ、さらに白色ポリエステル層（Ａ）を反射特性や製膜
性などに優れた層とすることで、フィルム全体として、
必要な特性の全てを満足させることが可能となるのであ
る。The white laminated polyester film of the present invention needs to have a laminated structure of two or more layers having a white polyester layer (A) on at least one side of a white polyester layer (B). For example, when the effect of the present invention is intended to be obtained with a single-layer single film, the film is likely to be broken, and the film formation is unstable, so that the cost may be increased as a result. In addition, when an incompatible resin is added to contain fine bubbles, depending on the type, the dispersed incompatible resin in the form of particles is dropped off, and a film forming apparatus is used during a long-time film formation. Contacting parts (drums, rolls, etc.) may be contaminated. In addition, the contamination may undesirably affect the film characteristics, or may cause problems such as a reduction in productivity and an increase in cost due to periodic cleaning as a countermeasure. Moreover,
Problems such as coloring due to a light stabilizer also tend to occur. Therefore, the white polyester layer (B) is made to be a layer having excellent reflection characteristics and film forming properties by making the white polyester layer (B) exhibit light resistance and reflection characteristics by fine bubbles. By doing, as a whole film,
It is possible to satisfy all the necessary characteristics.
【００２９】ここで、本発明の白色積層ポリエステルフ
ィルムが、白色ポリエステル層（Ｂ）の片面に白色ポリ
エステル層（Ａ）を有する２層積層構成である場合、反
射板に用いる際には白色ポリエステル層（Ａ）が透明性
基材（例えば、図１では透明導光板１５）の側に、リフ
レクターとして用いる際には白色ポリエステル層（Ａ）
が照明光源（同じく、図１での冷陰極線管１７）の側に
配置される必要がある。これは、２層以上の複合フィル
ムであっても表層側に耐光剤が含有せしめられている場
合には、単膜フィルムと同様に、照明光源からの光およ
び／または熱を直接、長期間受けた後では耐光剤が表面
にブリードアウトすることによって反射特性が低下する
ことがあるためである。反射特性が低下すると、当然な
がら面光源としての能力が低下し、液晶画面の明るさも
低下してしまうことになる。Here, when the white laminated polyester film of the present invention has a two-layer laminated structure having the white polyester layer (A) on one side of the white polyester layer (B), when the white polyester layer is used for a reflector, the white polyester layer is used. When (A) is used as a reflector on the side of a transparent substrate (eg, the transparent light guide plate 15 in FIG. 1), a white polyester layer (A)
Needs to be arranged on the side of the illumination light source (also the cold cathode ray tube 17 in FIG. 1). This is because even if the light-resistant agent is contained on the surface side even in the case of a composite film having two or more layers, the light and / or heat from the illumination light source is directly received for a long period of time as in the case of the single film film. This is because the light-resistant agent bleeds out to the surface after the light-emitting, and the reflection characteristics may be deteriorated. When the reflection characteristic is reduced, the ability as a surface light source is naturally reduced, and the brightness of the liquid crystal screen is also reduced.
【００３０】従って、本発明の白色積層ポリエステルフ
ィルムを、白色ポリエステル層（Ｂ）の両面に白色ポリ
エステル層（Ａ）を積層し、３層積層構成としたもの
は、製膜性がより向上し、取扱性などの実用性も向上さ
せることができる点から、より望ましいものである。す
なわち、用いる耐光剤によっては、製膜時にその耐光剤
成分が、ドラム、ロール、電極（ドラム上に押出成形し
てフィルム化する際、密着冷却固化させるための静電気
印加素線）等を汚染するという問題も全く発生しないか
らである。Therefore, when the white laminated polyester film of the present invention is formed by laminating the white polyester layer (A) on both sides of the white polyester layer (B) to form a three-layer laminated structure, the film-forming properties are further improved. This is more desirable because practicality such as handleability can be improved. That is, depending on the light-resistant agent used, the light-resistant agent component contaminates a drum, a roll, an electrode (an element for applying an electrostatic charge for solidifying, cooling, and solidifying when extruded on the drum to form a film) during film formation. This is because the problem does not occur at all.
【００３１】また本発明においては、白色ポリエステル
層（Ａ）と白色ポリエステル層（Ｂ）の各層に用いるポ
リエステルの種類は同一であっても、異なっていてもよ
い。特に異なったポリエステルの組合せ、例えば、白色
ポリエステル層（Ａ）に用いられるポリエステルがポリ
エチレンナフタレートで、白色ポリエステル層（Ｂ）に
用いられるポリエステルがポリエチレンテレフタレート
の場合、耐光性、剛性などの向上効果が得られるのでよ
り好ましい。In the present invention, the type of polyester used for each of the white polyester layer (A) and the white polyester layer (B) may be the same or different. In particular, when different polyester combinations are used, for example, when the polyester used for the white polyester layer (A) is polyethylene naphthalate and the polyester used for the white polyester layer (B) is polyethylene terephthalate, the effect of improving light resistance, rigidity and the like is improved. It is more preferable because it can be obtained.
【００３２】なお本発明においては、白色ポリエステル
層（Ａ）と白色ポリエステル層（Ｂ）を積層する方法と
しては溶融製膜中の共押出により複合化する方法、ある
いはそれぞれ別々に製膜した後、ラミネートする方法の
いずれでもよいが、コストなどの点で前者の方法がより
好ましい。In the present invention, as a method of laminating the white polyester layer (A) and the white polyester layer (B), a method of co-extrusion during melt film formation, or a method of separately forming each film, Any of laminating methods may be used, but the former method is more preferable in terms of cost and the like.
【００３３】本発明の白色積層ポリエステルフィルムの
反射特性としては、白色ポリエステル層（Ａ）側から測
定した４００〜７００ｎｍの平均反射率が８５％以上で
あることが好ましく、より好ましくは８７％以上、さら
には９０％以上が最も好ましい。上記平均反射率が８５
％未満の場合、反射特性が不十分となって、液晶画面の
明るさも不十分となりやすくなるため好ましくない。As the reflection characteristics of the white laminated polyester film of the present invention, the average reflectance at 400 to 700 nm measured from the white polyester layer (A) side is preferably 85% or more, more preferably 87% or more. Further, 90% or more is most preferable. The average reflectance is 85
%, The reflection characteristics are insufficient, and the brightness of the liquid crystal screen tends to be insufficient.
【００３４】本発明においては、フィルムの比重が０．
４以上１．３未満であることが好ましく、より好ましく
は０．４５以上１．２以下、更には０．５以上１．１以
下が最も好ましい。比重が０．４より小さい場合、低比
重化のために気泡を大量に含有せしめねばならず、その
ためにフィルム強度が低下したり、製膜時にフィルム破
れ等が発生しやすくなって生産性が低下することがあり
好ましくない。また、比重が１．３以上の場合には、フ
ィルムの反射特性が不十分となるため好ましくない。In the present invention, the specific gravity of the film is 0.1.
It is preferably from 4 to less than 1.3, more preferably from 0.45 to 1.2, even more preferably from 0.5 to 1.1. When the specific gravity is smaller than 0.4, a large amount of bubbles must be contained for lowering the specific gravity, and therefore, the film strength is reduced, and the film is easily broken at the time of film formation, and the productivity is reduced. May be undesirable. Further, when the specific gravity is 1.3 or more, the reflection characteristics of the film become insufficient, which is not preferable.
【００３５】また、本発明の白色積層ポリエステルフィ
ルムは、白色ポリエステル層（Ａ）側から測定した光沢
度が５〜７０％であることが好ましく、より好ましくは
１０〜６０％、最も好ましくは１０〜５０％である。光
沢度が７０％より大きい場合、フィルム表面の反射のう
ち、鏡面反射の割合が多くなり、乱反射（拡散反射）特
性が低下し、観る角度によって液晶画面の明るさにムラ
が発生することがあるので好ましくない。一方、光沢度
が５％未満の場合には、フィルム表面が粗くなりすぎ
て、例えば、反射板として面光源の背面に用いたとき導
光板との重なりが不均一になって、結果的には液晶画面
の明るさにムラが発生することがあるので好ましくな
い。The white laminated polyester film of the present invention preferably has a glossiness measured from the white polyester layer (A) side of 5 to 70%, more preferably 10 to 60%, most preferably 10 to 60%. 50%. When the glossiness is greater than 70%, the ratio of specular reflection among the reflections on the film surface is increased, the irregular reflection (diffuse reflection) characteristics are reduced, and the brightness of the liquid crystal screen may become uneven depending on the viewing angle. It is not preferable. On the other hand, if the glossiness is less than 5%, the film surface becomes too rough, for example, when used as a reflector on the back of a surface light source, the overlap with the light guide plate becomes uneven, and as a result, This is not preferable because unevenness may occur in the brightness of the liquid crystal screen.
【００３６】本発明の白色積層ポリエステルフィルムの
厚みは、特に限定されないが、通常１０〜５００μｍ、
好ましくは２０〜３００μｍ程度の範囲にあるものが、
面光源反射板の反射特性や実用面での取扱性に優れるの
で好ましい。また、全厚みに対する白色ポリエステル層
（Ｂ）の比率（白色ポリエステル層（Ｂ）の厚み／全厚
み）が、０．５５〜０．９９であることが好ましく、よ
り好ましくは０．６〜０．９７、最も好ましくは０．６
５〜０．９５である。上記比率が０．５５より小さい場
合、十分な耐光性あるいは反射特性が得にくい。一方、
０．９９より大きい場合には、製膜性に劣ることがあ
る。The thickness of the white laminated polyester film of the present invention is not particularly limited, but is usually 10 to 500 μm,
What is preferably in the range of about 20 to 300 μm,
It is preferable because the reflection characteristics of the surface light source reflector and the handling property in practical use are excellent. Further, the ratio of the white polyester layer (B) to the total thickness (thickness of the white polyester layer (B) / total thickness) is preferably from 0.55 to 0.99, more preferably from 0.6 to 0.99. 97, most preferably 0.6
5 to 0.95. If the above ratio is less than 0.55, it is difficult to obtain sufficient light resistance or reflection characteristics. on the other hand,
When it is larger than 0.99, the film-forming property may be poor.
【００３７】次に、本発明の白色積層ポリエステルフィ
ルムの製造方法について、その一例を説明するが、かか
る例のみに限定されるものではない。Next, an example of the method for producing a white laminated polyester film of the present invention will be described, but the present invention is not limited to only such an example.
【００３８】押出機（Ａ）と押出機（Ｂ）を有する複合
製膜装置において、白色ポリエステル層（Ｂ）を形成す
るため、真空乾燥したポリエステルのチップおよび耐光
剤のマスターチップと、必要に応じて真空乾燥した非相
溶樹脂のチップとを、非相溶樹脂が１〜３５重量％、耐
光剤が０．０５〜１０重量％となるよう混合したものを
押出機（Ｂ）に供給する。非相溶樹脂の添加は予めマス
ターチップとしたものを真空乾燥して使用してもよい。
また、白色ポリエステル層（Ａ）を積層するため、ポリ
エステルのチップおよび無機系微粒子のマスターチップ
を、無機系微粒子が１〜４０重量％となるよう混合し、
充分に真空乾燥した後に２７０〜３００℃に加熱された
押出機（Ａ）に供給し、Ｔダイ複合口金内で押出機
（Ａ）のポリマーを押出機（Ｂ）のポリマーの表層（片
面）或いは両表層（両面）に積層してシート状に共押出
成形し、溶融積層シートを得る。In a composite film forming apparatus having an extruder (A) and an extruder (B), in order to form a white polyester layer (B), vacuum-dried polyester chips and light-proofing agent master chips are used, if necessary. A mixture of the chips of the incompatible resin dried under vacuum and the incompatible resin in an amount of 1 to 35% by weight and the light stabilizer in an amount of 0.05 to 10% by weight is supplied to the extruder (B). The immiscible resin may be added by vacuum-drying a master chip previously used.
Further, in order to laminate the white polyester layer (A), a polyester chip and a master chip of inorganic fine particles are mixed so that the inorganic fine particles become 1 to 40% by weight,
After sufficient vacuum drying, the extruder (A) is supplied to the extruder (A) heated to 270 to 300 ° C., and the extruder (A) polymer is extruded into the extruder (B) polymer surface layer (one side) or in the T-die composite die. It is laminated on both surface layers (both sides) and co-extruded into a sheet to obtain a molten laminated sheet.
【００３９】この溶融積層シートを、表面温度１０〜６
０℃に冷却されたドラム上で静電気により密着冷却固化
し、未延伸積層フィルムを作製する。該未延伸積層フィ
ルムを７０〜１２０℃に加熱したロール群に導き、長手
方向（縦方向、すなわちフィルムの進行方向）に２〜５
倍延伸し、２０〜３０℃のロール群で冷却する。This molten laminated sheet was subjected to a surface temperature of 10 to 6
It is tightly cooled and solidified by static electricity on a drum cooled to 0 ° C. to produce an unstretched laminated film. The unstretched laminated film is guided to a group of rolls heated to 70 to 120 ° C., and has a length of 2 to 5 in a longitudinal direction (longitudinal direction, that is, a traveling direction of the film).
The film is double-stretched and cooled with a group of rolls at 20 to 30 ° C.
【００４０】続いて長手方向に延伸したフィルムの両端
をクリップで把持しながらテンターに導き９０〜１４０
℃に加熱した雰囲気中で長手方向に垂直な方向（横方
向）に２〜５倍延伸する。Subsequently, the film stretched in the longitudinal direction was guided to a tenter while gripping both ends of the film with clips, and 90-140.
The film is stretched 2 to 5 times in a direction (lateral direction) perpendicular to the longitudinal direction in an atmosphere heated to ° C.
【００４１】延伸倍率は、縦、横それぞれ２〜５倍に延
伸するが、その面積倍率（縦延伸倍率×横延伸倍率）は
６〜２０倍であることが好ましい。面積倍率が６倍未満
であると得られるフィルムの反射特性が不十分となり、
逆に２０倍を越えると延伸時に破れを生じやすくなる傾
向がある。The stretching ratio is 2 to 5 times each in the longitudinal and transverse directions, and the area ratio (longitudinal stretching ratio × lateral stretching ratio) is preferably 6 to 20 times. When the area magnification is less than 6 times, the reflection characteristics of the obtained film become insufficient,
Conversely, if it exceeds 20 times, there is a tendency that tearing occurs easily during stretching.
【００４２】こうして得られた二軸延伸積層フィルムの
平面性、寸法安定性を付与するために、引き続いてテン
ター内で１５０〜２３０℃の熱固定を行い、均一に徐冷
後、室温まで冷やして巻き取り、本発明の白色積層ポリ
エステルフィルムを得ることができる。In order to impart the planarity and dimensional stability of the biaxially stretched laminated film thus obtained, the film is successively heat-set at 150 to 230 ° C. in a tenter, uniformly cooled slowly, and then cooled to room temperature. After winding, the white laminated polyester film of the present invention can be obtained.
【００４３】このようにして得られた本発明の白色積層
ポリエステルフィルムは、耐光性、反射特性に優れるた
め、該フィルムを面光源反射部材である反射板やリフレ
クターに用いた面光源は長期間使用した場合でも液晶画
面を明るく均一に照らすことができ、さらに、画面上の
画像も高度に鮮明で非常に見やすいものとすることがで
きる。従って、本発明の白色ポリエステルフィルムは面
光源反射部材として最適の特性を有するフィルムであ
る。Since the white laminated polyester film of the present invention thus obtained is excellent in light resistance and reflection characteristics, a surface light source using the film for a reflector or reflector as a surface light source reflection member can be used for a long time. In this case, the liquid crystal screen can be brightly and uniformly illuminated, and the image on the screen can be highly clear and very easy to see. Therefore, the white polyester film of the present invention is a film having optimal characteristics as a surface light source reflecting member.
【００４４】［特性の測定方法および評価方法］本発明
の特性値は、次の評価方法、評価基準による。 （１）無機系微粒子の平均粒子径 無機系微粒子の平均粒子径は、その粒子を含有させて得
られた白色積層ポリエステルフィルムを断面観察して求
めた。すなわち、透過型電子顕微鏡ＨＵ−１２型
（（株）日立製作所製）を用い、白色ポリエステル層
（Ａ）の断面部分を３，０００〜２００，０００倍に拡
大観察した断面写真から求めた。すなわち、断面写真の
粒子部分をマーキングして、その粒子部分をハイビジョ
ン画像解析処理装置ＰＩＡＳ−IV（（株）ピアス製）を
用いて画像処理を行い、測定視野内の計１００個の粒子
を真円に換算した時の平均径を算出し、粒子の平均粒子
径とした。[Method of Measuring and Evaluating Characteristics] The characteristic values of the present invention are based on the following evaluation methods and evaluation criteria. (1) Average particle diameter of inorganic fine particles The average particle diameter of inorganic fine particles was determined by observing a cross section of a white laminated polyester film obtained by incorporating the particles. That is, using a transmission electron microscope HU-12 type (manufactured by Hitachi, Ltd.), the cross-sectional portion of the white polyester layer (A) was obtained from a cross-sectional photograph magnified 3,000 to 200,000 times. That is, the particle portion of the cross-sectional photograph is marked, and the particle portion is subjected to image processing using a high-definition image analysis processing device PIAS-IV (manufactured by Pierce Co., Ltd.). The average diameter when converted to a circle was calculated and defined as the average particle diameter of the particles.
【００４５】（２）フィルム内部の微細な気泡および白
色ポリエステル層の厚み 得られた白色積層ポリエステルフィルムの断面を、走査
型電子顕微鏡Ｓ−２１００Ａ形（（株）日立製作所製）
を用いて５００〜５，０００倍に拡大観察した断面写真
より微細な気泡の含有の有無を調べた。また、断面写真
より各白色ポリエステル層の厚み方向の長さを計測し、
拡大倍率から逆算して各層の厚みを求めた。なお、各層
の厚みを求めるに当たっては、互いに異なる測定視野か
ら任意に選んだ計５箇所の断面写真を使用し、その平均
値を白色ポリエステル層の厚みとした。(2) Fine air bubbles inside the film and thickness of white polyester layer A cross section of the obtained white laminated polyester film was subjected to scanning electron microscope S-2100A type (manufactured by Hitachi, Ltd.).
Was used to examine the presence or absence of fine bubbles from a cross-sectional photograph magnified 500 to 5,000 times. Also, measure the length in the thickness direction of each white polyester layer from the cross-sectional photograph,
The thickness of each layer was determined by calculating backward from the magnification. In determining the thickness of each layer, a total of five cross-sectional photographs arbitrarily selected from different measurement visual fields were used, and the average value was defined as the thickness of the white polyester layer.
【００４６】（３）製膜性 製膜時における、フィルム破れなどのトラブル発生や製
膜装置の汚染について、以下の３段階評価を行った。○
以上が良好であった。 ○：製膜が安定しており、良好。 △：時々フィルム破れが発生するか、または製膜装置の
ドラム、ロール部分が汚れてくるため、製膜性に劣る。 ×：フィルム破れが多発し、製膜性が全く不良。(3) Film-forming properties The following three-stage evaluation was carried out with respect to occurrence of troubles such as film breakage and contamination of the film-forming apparatus during film-forming. ○
The above was good. ：: The film formation is stable and good. Δ: Film tearing occurs occasionally or the drum and roll portions of the film forming apparatus become dirty, resulting in poor film forming properties. X: The film is frequently torn and the film-forming properties are completely poor.
【００４７】（４）平均反射率 白色積層ポリエステルフィルムについて、白色ポリエス
テル層（Ａ）側より分光式色差計ＳＥ−２０００型（日
本電色工業（株）製）を用い、ＪＩＳ Ｚ−８７２２に
準じて４００〜７００ｎｍの範囲の分光反射率を１０ｎ
ｍ間隔で測定し、各値を平均して求めた。 （５）耐光性 紫外線劣化促進試験機アイスーパーＵＶテスターＳＵＶ
−Ｗ１３１（岩崎電気（株）製）を用いて、下記の条件
で紫外線照射５時間の強制耐光試験を行った。 「紫外線照射条件」 照度：１００ｍＷ／ｃｍ2、温度：６０℃、相対湿度：
５０％ＲＨ なお、該試験は白色ポリエステル層（Ａ）側より紫外線
照射して行った。次に、紫外線照射前後の平均反射率を
上記（４）項の測定方法に従って測定し、その差（照射
前の平均反射率−照射後の平均反射率）について以下の
４段階評価を行った。○以上を良好とした。 ◎：１．５％未満 ○：１．５％以上３％未満 △：３％以上５％未満 ×：５％以上(4) Average reflectance The white laminated polyester film was measured from the white polyester layer (A) side using a spectroscopic colorimeter SE-2000 (manufactured by Nippon Denshoku Industries Co., Ltd.) according to JIS Z-8722. The spectral reflectance in the range of 400 to 700 nm to 10 n
The measurement was performed at m intervals, and each value was averaged. (5) Light fastness UV deterioration accelerating tester iSuper UV tester SUV
Using -W131 (manufactured by Iwasaki Electric Co., Ltd.), a forced light resistance test was performed for 5 hours under ultraviolet irradiation under the following conditions. “Ultraviolet irradiation conditions” Illuminance: 100 mW / cm 2 , temperature: 60 ° C., relative humidity:
50% RH The test was conducted by irradiating ultraviolet rays from the white polyester layer (A) side. Next, the average reflectance before and after ultraviolet irradiation was measured according to the measurement method described in the above section (4), and the difference (average reflectance before irradiation-average reflectance after irradiation) was evaluated in the following four steps. ○ The above was regarded as good. ◎: less than 1.5% ○: 1.5% or more and less than 3% △: 3% or more and less than 5% ×: 5% or more
【００４８】（６）光沢度 デジタル変角光沢度計ＵＧＶ−５Ｂ（スガ試験機（株）
製）を用いて、白色ポリエステル層（Ａ）側よりＪＩＳ
Ｚ−８７４１に準じて測定した。なお、測定条件は入
射角＝６０゜、受光角＝６０゜とした。 （７）比重 フィルムを５０ｍｍ×６０ｍｍの大きさにカットして得
た試料サンプルを、高精度電子比重計ＳＤ−１２０Ｌ
（ミラージュ貿易（株）製）を用い、ＪＩＳ Ｋ−７１
１２のＡ法（水中置換法）に準じて測定した。なお、測
定条件は温度２３℃、相対湿度６５％にて行った。 （８）面光源輝度 図１の装置構成と同様にして、厚み２ｍｍのアクリル板
に網点印刷を施したものを用意し、該アクリル板の網点
印刷側に白色積層ポリエステルフィルムを、反対側に拡
散板として半透明シートを重ね合わせてセットした。次
に、端面の片側より６Ｗの蛍光管にて照明し、拡散板側
よりデジタル光度計Ｊ１６と輝度測定用プローブＪ６５
０３（いずれも、テクトロニクス社製）を用いて輝度
（ｃｄ／ｍ 2）を測定し、画面の輝度を得た。なお、該
測定は光度計に取付た輝度測定用プローブの受光子部分
を拡散板に垂直に押し当てて測定した。また、平均の取
り方としては、９カ所の定点上を３回測定し、該３回の
測定値の平均を取った後、各９カ所での測定値の平均を
取って面光源輝度とした。面光源輝度の値が高いほど、
白色積層ポリエステルフィルムが反射板として優れてい
ることを表す。(6) Gloss Digital goniogloss meter UGV-5B (Suga Test Instruments Co., Ltd.)
JIS) from the white polyester layer (A) side
It measured according to Z-8741. The measurement conditions are not
The firing angle was 60 ° and the light receiving angle was 60 °. (7) Specific gravity Obtained by cutting the film to a size of 50 mm x 60 mm
The sample is placed on a high-precision electronic hydrometer SD-120L.
(Made by Mirage Trading Co., Ltd.) using JIS K-71
The measurement was carried out according to Method A (Substitution method in water) of No. 12. Note that
The fixed conditions were a temperature of 23 ° C. and a relative humidity of 65%. (8) Surface light source luminance Acrylic plate with a thickness of 2 mm in the same manner as the device configuration in FIG.
A halftone dot printed on the acrylic plate is prepared.
Expand the white laminated polyester film on the printing side and
A translucent sheet was set as a scattering plate on top of one another. Next
Then, illuminate from one side of the end face with a 6 W fluorescent tube, and
More digital photometer J16 and brightness measurement probe J65
03 (all manufactured by Tektronix)
(Cd / m Two) Was measured to obtain the screen brightness. In addition,
The measurement is the photodetector part of the luminance measurement probe attached to the photometer
Was pressed vertically against the diffusion plate and measured. Also, the average
As a method of measurement, three measurements were made on nine fixed points, and the three
After averaging the measured values, the average of the measured values at each of the nine locations is calculated.
The surface light source luminance was taken. The higher the value of the surface light source luminance,
White laminated polyester film is excellent as a reflector
It represents that.
【００４９】[0049]
【実施例】本発明を以下の実施例、比較例を用いて説明
するが、本発明はこれらに限定されるものではない。The present invention will be described with reference to the following examples and comparative examples, but the present invention is not limited to these examples.
【００５０】実施例１ 押出機（Ａ）と押出機（Ｂ）を有する複合製膜装置にお
いて、白色ポリエステル層（Ａ）を形成するため、ポリ
エチレンテレフタレート（以降、ＰＥＴと省略する）チ
ップに平均粒子径１μｍの炭酸カルシウム微粒子を１４
重量％含有せしめた原料を１８０℃で３時間真空乾燥し
た後、押出機（Ａ）側に供給し、常法により２８５℃で
溶融してＴダイ複合口金に導入した。Example 1 In a composite film-forming apparatus having an extruder (A) and an extruder (B), a polyethylene terephthalate (hereinafter abbreviated as PET) chip was used to form a white polyester layer (A). 1 μm diameter calcium carbonate fine particles
The raw material containing the weight% was vacuum-dried at 180 ° C. for 3 hours, then supplied to the extruder (A) side, melted at 285 ° C. by a conventional method, and introduced into a T-die composite die.
【００５１】一方、白色ポリエステル層（Ｂ）を形成す
るため、上記ＰＥＴチップにポリメチルペンテン（以
降、ＰＭＰと省略する）を１０重量％、耐光剤としてベ
ンゾフェノン系紫外線吸収剤“アデカスタブ”ＬＡ−５
１（旭電化工業（株）製）を１重量％、さらに分散剤と
して分子量４０００のポリエチレングリコール（以降、
ＰＥＧと省略する）を１重量％含有せしめた原料を１８
０℃で３時間真空乾燥した後に、押出機（Ｂ）側に供給
し、常法により２８５℃で溶融して同様にＴダイ複合口
金に導入した。次いで、該口金内で白色ポリエステル層
（Ａ）が白色ポリエステル層（Ｂ）の両表層に積層され
るよう合流せしめた後、シート状に押出して溶融積層シ
ートとした。該溶融積層シートを表面温度２５℃に保た
れた冷却ドラム上に静電荷法で密着冷却固化させ未延伸
積層フィルムを得た。続いて、該未延伸積層フィルムを
常法に従い９８℃に加熱されたロール群を用いて長手方
向に３．２倍延伸し、２５℃のロール群で冷却した。さ
らに該延伸フィルムをテンターに導き１２５℃に加熱さ
れた雰囲気中で長手方向に垂直な方向に３．４倍延伸し
た。その後テンター内で２２０℃の熱固定を行い均一に
徐冷後巻き取り、白色ポリエステル層（Ａ）が片側５μ
ｍ、白色ポリエステル層（Ｂ）が９０μｍの構成とし
た、厚み１００μｍの白色積層ポリエステルフィルムを
得た。また、該白色積層ポリエステルフィルムの断面を
ＳＥＭにて拡大観察することにより、白色ポリエステル
層（Ｂ）の内部に微細な気泡を含有していることを確認
した。この微細な気泡は、粒子状に分散せしめられたＰ
ＭＰを核として、その周囲に形成されていた。On the other hand, in order to form the white polyester layer (B), 10% by weight of polymethylpentene (hereinafter abbreviated as “PMP”) was added to the PET chip, and a benzophenone-based ultraviolet absorber “ADK STAB” LA-5 was used as a light-resistant agent.
1 (manufactured by Asahi Denka Kogyo KK) in an amount of 1% by weight, and polyethylene glycol having a molecular weight of 4000 as a dispersant (hereinafter referred to as “polyethylene glycol”).
Raw material containing 1% by weight of PEG).
After vacuum drying at 0 ° C. for 3 hours, it was supplied to the extruder (B) side, melted at 285 ° C. by a conventional method, and similarly introduced into a T-die composite die. Next, the white polyester layer (A) was merged so as to be laminated on both surface layers of the white polyester layer (B) in the die, and extruded into a sheet to obtain a molten laminated sheet. The molten laminated sheet was tightly cooled and solidified by an electrostatic method on a cooling drum maintained at a surface temperature of 25 ° C. to obtain an unstretched laminated film. Subsequently, the unstretched laminated film was stretched 3.2 times in the longitudinal direction using a group of rolls heated to 98 ° C. in a conventional manner, and cooled by a group of rolls at 25 ° C. Further, the stretched film was guided to a tenter and stretched 3.4 times in a direction perpendicular to the longitudinal direction in an atmosphere heated to 125 ° C. After that, the film was heat-set at 220 ° C. in a tenter, uniformly cooled, and then wound up, and the white polyester layer (A) was 5 μm on one side.
m, a white laminated polyester film having a thickness of 100 μm and a white polyester layer (B) of 90 μm was obtained. In addition, the cross section of the white laminated polyester film was enlarged and observed with a SEM to confirm that the white polyester layer (B) contained fine air bubbles. These fine bubbles are dispersed in P
MP was formed around the nucleus.
【００５２】かくして得られた積層フィルムの特性は、
表１のとおりであり、平均反射率が９０％と反射特性に
優れ、かつ耐光性にも優れていることが分かる。また、
面光源輝度も高いレベルであって、反射板として非常に
優れていることが分かる。The properties of the laminated film thus obtained are as follows:
Table 1 shows that the average reflectance is 90%, which is excellent in reflection characteristics, and also excellent in light resistance. Also,
It can be seen that the surface light source luminance is also at a high level and is very excellent as a reflector.
【００５３】実施例２ 実施例１の押出機（Ａ）に供給する原料に、さらに蛍光
増白剤“ＯＢ−１”（イ−ストマン社製）を０．０５重
量％含有せしめたこと以外は、実施例１と同一手法で白
色積層ポリエステルフィルムを得た。このフィルムの特
性は、表１に示したとおり各特性に優れており、特に反
射特性や面光源輝度に優れるものであった。Example 2 Except that the raw material supplied to the extruder (A) of Example 1 further contained 0.05% by weight of an optical brightener "OB-1" (manufactured by Eastman Co.). A white laminated polyester film was obtained in the same manner as in Example 1. As shown in Table 1, the characteristics of this film were excellent in each characteristic, and particularly excellent in reflection characteristics and surface light source luminance.
【００５４】実施例３、４ 実施例２の押出機（Ｂ）に供給する原料のうち、耐光剤
の含有量を各々０．３重量％、２．５重量％としたこと
以外は、実施例２と同一手法で白色積層ポリエステルフ
ィルムを得た。このフィルムの特性は、表１に示したと
おり各特性に優れ、特に実施例３は反射特性や面光源輝
度に、実施例４は耐光性に優れるものであった。Examples 3 and 4 The procedure of Example 2 was repeated except that the content of the light stabilizer was 0.3% by weight and 2.5% by weight, respectively, of the raw materials supplied to the extruder (B) of Example 2. In the same manner as in Example 2, a white laminated polyester film was obtained. The characteristics of this film were excellent as shown in Table 1, and particularly, Example 3 was excellent in reflection characteristics and surface light source luminance, and Example 4 was excellent in light resistance.
【００５５】実施例５ 実施例２の押出機（Ｂ）に供給する原料のうち、耐光剤
の種類を紫外線吸収剤“チヌビン”１５７７ ＦＦ（チ
バ・スペシャリティ・ケミカルズ（株）製）に変えたこ
と以外は、実施例２と同一手法で白色積層ポリエステル
フィルムを得た。このフィルムの特性は、表１に示した
とおり各特性に優れ、特に反射特性や面光源輝度に優れ
るものであった。Example 5 Among the raw materials supplied to the extruder (B) of Example 2, the type of the light-proofing agent was changed to the ultraviolet absorber "Tinuvin" 1577 FF (manufactured by Ciba Specialty Chemicals Co., Ltd.). Except for the above, a white laminated polyester film was obtained in the same manner as in Example 2. The properties of this film were excellent as shown in Table 1, and particularly excellent in reflection properties and surface light source luminance.
【００５６】比較例１ 実施例１の押出機（Ｂ）に供給する原料のうち、耐光剤
を除いたこと以外は実施例１と同一手法で白色積層ポリ
エステルフィルムを得た。このフィルムの特性は、表１
に示したとおり、平均反射率は９２％と高い値を示すも
のの、耐光性に劣るものであった。Comparative Example 1 A white laminated polyester film was obtained in the same manner as in Example 1 except that the light-proofing agent was omitted from the raw materials supplied to the extruder (B) of Example 1. Table 1 shows the properties of this film.
As shown in Table 2, the average reflectance was as high as 92%, but the light resistance was poor.
【００５７】比較例２ 実施例１の押出機（Ｂ）に供給する原料のうち、ＰＭＰ
およびＰＥＧを除き、代わりに平均粒子径０．２μｍの
アナターゼ型酸化チタン微粒子を１４重量％となるよう
含有せしめたこと以外は、実施例１と同一手法で白色積
層ポリエステルフィルムを得た。ＳＥＭ断面観察より、
この白色積層ポリエステルフィルム内部には微細な気泡
は含有されていないことを確認した。このフィルムの特
性は、表１に示したとおり、耐光性は良好であるもの
の、平均反射率が７８％と低レベルであり反射特性や面
光源輝度に劣るものであった。Comparative Example 2 Of the raw materials supplied to the extruder (B) of Example 1, PMP
A white laminated polyester film was obtained in the same manner as in Example 1 except that fine particles of anatase type titanium oxide having an average particle diameter of 0.2 μm were contained instead of 14% by weight except for PEG and PEG. From SEM cross-section observation,
It was confirmed that no fine bubbles were contained inside the white laminated polyester film. As shown in Table 1, the film had good light fastness, but had a low level of average reflectance of 78% and was inferior in reflection characteristics and surface light source luminance.
【００５８】比較例３ 実施例１の押出機（Ａ）、（Ｂ）に供給する原料を、い
ずれもＰＥＴチップにＰＭＰを１０重量％、ＰＥＧを１
重量％、平均粒子径１μｍの炭酸カルシウム微粒子を５
重量％、さらに耐光剤としてベンゾフェノン系紫外線吸
収剤“アデカスタブ”ＬＡ−５１（旭電化工業（株）
製）を１重量％含有せしめたものに変えたこと以外は、
実施例１と同一手法で白色ポリエステルフィルムを得
た。ＳＥＭ断面観察より、このフィルム内部には微細な
気泡が含有せしめられているものの、実質的に１層の単
膜フィルムであることを確認した。また、その特性は、
表１に示したとおり、耐光性や反射特性は良好であるも
のの、製膜中にフィルム破れが発生しやすく、さらに製
膜装置のドラムやロール部分が次第に汚れてくるなど、
製膜性に劣るものであった。COMPARATIVE EXAMPLE 3 The raw materials supplied to the extruders (A) and (B) of Example 1 were all prepared by adding 10% by weight of PMP and 1% of PEG to a PET chip.
5% by weight of calcium carbonate fine particles having an average particle size of 1 μm.
Weight percent, and a benzophenone-based UV absorber "ADK STAB" LA-51 (Asahi Denka Kogyo KK)
) Was changed to one containing 1% by weight.
A white polyester film was obtained in the same manner as in Example 1. From the SEM cross-section observation, it was confirmed that although this film contained fine air bubbles, it was substantially a single-layer film. Also, its characteristics are
As shown in Table 1, although light resistance and reflection characteristics are good, the film is easily broken during film formation, and furthermore, the drum and roll part of the film forming apparatus gradually become dirty.
It was inferior in film forming property.
【００５９】比較例５ 実施例２の押出機（Ｂ）に供給する原料のうち耐光剤を
除き、その代わりに押出機（Ａ）に、さらに紫外線吸収
剤“チヌビン”１５７７ ＦＦ（チバ・スペシャリティ
・ケミカルズ（株）製）を２重量％含有せしめたこと以
外は、実施例２と同一手法で白色積層ポリエステルフィ
ルムを得た。このフィルムの特性は、表１に示したとお
り各特性に優れるものの、製膜製に劣るものであった。COMPARATIVE EXAMPLE 5 The raw material supplied to the extruder (B) of Example 2 was removed except for the light-proofing agent. Instead, the extruder (A) was further supplied with an ultraviolet absorber “Tinuvin” 1577 FF (Ciba Specialty Co., Ltd.). Chemicals Co., Ltd.) (2% by weight) was obtained in the same manner as in Example 2 except that a white laminated polyester film was obtained. As shown in Table 1, the characteristics of this film were excellent in each of the characteristics, but were inferior to those of the film production.
【００６０】[0060]
【表１】 [Table 1]
【００６１】[0061]
【発明の効果】本発明の面光源反射部材用白色積層ポリ
エステルフィルムは、微細な気泡を含有する白色ポリエ
ステル層（Ｂ）の少なくとも片面に白色ポリエステル層
（Ａ）を有する２層以上の積層構成を有し、該白色ポリ
エステル層（Ｂ）が耐光剤を含有して成ることから、反
射特性、耐光性などに優れており、液晶画面を照明する
面光源内の反射板やリフレクターとして用いられた時、
液晶画面を明るく照らして液晶画像をより鮮明にかつ見
やすくできると共に、長期間使用後にも優れた反射特性
を示すので、面光源としての耐久性も著しく向上でき
る。The white laminated polyester film for a surface light source reflecting member of the present invention has a laminated structure of two or more layers having a white polyester layer (A) on at least one side of a white polyester layer (B) containing fine bubbles. Since the white polyester layer (B) contains a light-resistant agent, the white polyester layer (B) has excellent reflection properties and light resistance, and is used as a reflector or a reflector in a surface light source for illuminating a liquid crystal screen. ,
The liquid crystal screen can be brightly illuminated to make the liquid crystal image clearer and easier to see, and since it exhibits excellent reflection characteristics even after long-term use, the durability as a surface light source can be significantly improved.
【図１】反射板を組み込んだサイドライト方式面光源の
装置構造の一例を示す概略断面図である。FIG. 1 is a schematic sectional view showing an example of a device structure of a side light type surface light source incorporating a reflector.
１１ 反射板 １２ リフレクター １３ 液晶画面 １４ 拡散板 １５ 透明導光板（透明性基材） １６ 網点印刷 １７ 冷陰極線管 DESCRIPTION OF SYMBOLS 11 Reflecting plate 12 Reflector 13 Liquid crystal screen 14 Diffusion plate 15 Transparent light guide plate (transparent base material) 16 Halftone printing 17 Cold cathode ray tube
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｇ０９Ｆ 9/00 ３２４ Ｇ０９Ｆ 9/00 ３２４ // Ｂ３２Ｂ 27/36 Ｂ３２Ｂ 27/36 Ｆターム(参考） 2H042 BA01 BA02 BA12 BA15 BA20 2H091 FA16Z FA23Z FA32Z FB02 FB11 FC09 LA03 4F100 AA01B AA01C AA08 AH02 AK01A AK03A AK08 AK41A AK41B AK41C AK42 AK54 AL05A BA02 BA03 BA06 BA07 BA10B BA15 CA07 CA07A DE01B DE01C DJ00A EH20 EJ38 GB41 JL09 JL10A JL10B JL10C JN06 JN06B JN06C JN13A JN13B JN13C YY00A YY00B YY00C 5G435 AA08 BB12 BB15 EE27 FF03 FF08 GG24 HH20 KK07 Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat II (reference) G09F 9/00 324 G09F 9/00 324 // B32B 27/36 B32B 27/36 F term (reference) 2H042 BA01 BA02 BA12 BA15 BA20 2H091 FA16Z FA23Z FA32Z FB02 FB11 FC09 LA03 4F100 AA01B AA01C AA08 AH02 AK01A AK03A AK08 AK41A AK41B AK41C AK42 AK54 AL05A BA02 BA03 BA06 BA07 BA10B BA15 CA07 CA07A DE01B DE01C DJ00A EH20 EJ38 GB41 JL09 JL10A JL10B JL10C JN06 JN06B JN06C JN13A JN13B JN13C YY00A YY00B YY00C 5G435 AA08 BB12 BB15 EE27 FF03 FF08 GG24 HH20 KK07
Claims (8)
層（Ｂ）の少なくとも片面に白色ポリエステル層（Ａ）
を有する２層以上の白色積層ポリエステルフィルムであ
って、該白色ポリエステル層（Ｂ）が耐光剤を含有して
成ることを特徴とする面光源反射部材用白色積層ポリエ
ステルフィルム。1. A white polyester layer (A) on at least one side of a white polyester layer (B) containing fine bubbles.
A white laminated polyester film for a surface light source reflecting member, characterized in that the white polyester layer (B) contains a light stabilizer.
含有量が０．０５〜１０重量％であることを特徴とする
請求項１に記載の面光源反射部材用白色積層ポリエステ
ルフィルム。2. The white laminated polyester film for a surface light source reflecting member according to claim 1, wherein the content of the light stabilizer in the white polyester layer (B) is 0.05 to 10% by weight.
た、４００〜７００ｎｍの平均反射率が８５％以上であ
ることを特徴とする請求項１または請求項２に記載の面
光源反射部材用白色積層ポリエステルフィルム。3. The white light for a surface light source reflecting member according to claim 1, wherein the average reflectance at 400 to 700 nm measured from the white polyester layer (A) side is 85% or more. Laminated polyester film.
子を１〜４０重量％含有することを特徴とする請求項１
〜請求項３のいずれかに記載の面光源反射部材用白色積
層ポリエステルフィルム。4. The white polyester layer (A) contains 1 to 40% by weight of inorganic fine particles.
The white laminated polyester film for a surface light source reflecting member according to any one of claims 1 to 3.
は白色ポリエステル層（Ｂ）に蛍光増白剤を含有せしめ
たことを特徴とする請求項１〜請求項４のいずれかに記
載の面光源反射部材用白色積層ポリエステルフィルム。5. The surface light source reflection according to claim 1, wherein a fluorescent whitening agent is contained in the white polyester layer (A) and / or the white polyester layer (B). White laminated polyester film for members.
テルに対し非相溶性の熱可塑性樹脂を含有して成ること
を特徴とする請求項１〜請求項５のいずれかに記載の面
光源反射部材用白色積層ポリエステルフィルム。6. The surface light source reflecting member according to claim 1, wherein the white polyester layer (B) contains a thermoplastic resin incompatible with the polyester. White laminated polyester film.
樹脂がポリオレフィン樹脂であることを特徴とする請求
項６に記載の面光源反射部材用白色積層ポリエステルフ
ィルム。7. The white laminated polyester film for a surface light source reflecting member according to claim 6, wherein the thermoplastic resin incompatible with the polyester is a polyolefin resin.
リエステル層（Ｂ）、両表層部が白色ポリエステル層
（Ａ）であることを特徴とする請求項１〜請求項７のい
ずれかに記載の面光源反射部材用白色積層ポリエステル
フィルム。8. A three-layer laminated structure, wherein the core layer is a white polyester layer (B), and both surface layers are white polyester layers (A). A white laminated polyester film for a surface light source reflecting member according to the above-described item.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000289940A JP2002098808A (en) | 2000-09-25 | 2000-09-25 | White laminated polyester film for reflecting member of planar light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000289940A JP2002098808A (en) | 2000-09-25 | 2000-09-25 | White laminated polyester film for reflecting member of planar light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002098808A true JP2002098808A (en) | 2002-04-05 |
Family
ID=18773243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000289940A Pending JP2002098808A (en) | 2000-09-25 | 2000-09-25 | White laminated polyester film for reflecting member of planar light source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002098808A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004339403A (en) * | 2003-05-16 | 2004-12-02 | Toray Ind Inc | Light-reflecting film |
| WO2005026241A1 (en) * | 2003-09-11 | 2005-03-24 | Teijin Dupont Films Japan Limited | Polyester film |
| JP2006021373A (en) * | 2004-07-07 | 2006-01-26 | Toray Ind Inc | White polyester film |
| JP2007015315A (en) * | 2005-07-11 | 2007-01-25 | Teijin Dupont Films Japan Ltd | Laminated film |
| JP2007178998A (en) * | 2005-12-01 | 2007-07-12 | Sekisui Film Kk | Reflective film, reflective laminated film and reflective laminated board |
| JP2008030459A (en) * | 2006-07-07 | 2008-02-14 | Toray Ind Inc | White laminated polyester film for reflective sheet |
| WO2008053740A1 (en) * | 2006-10-27 | 2008-05-08 | Toray Industries, Inc. | White polyester film for liquid crystal display reflector |
| WO2008093623A1 (en) | 2007-01-31 | 2008-08-07 | Toray Industries, Inc. | White polyester film and reflective sheet |
| JP2009051175A (en) * | 2007-08-29 | 2009-03-12 | Teijin Dupont Films Japan Ltd | Biaxially stretched laminated film for reflectors |
| JP2009244749A (en) * | 2008-03-31 | 2009-10-22 | Furukawa Electric Co Ltd:The | Light reflective plate |
| WO2010074312A1 (en) * | 2008-12-25 | 2010-07-01 | 住友化学株式会社 | Light diffusion plate |
| JP5173417B2 (en) * | 2005-07-11 | 2013-04-03 | 帝人デュポンフィルム株式会社 | Laminated film |
| EP3592555B1 (en) | 2017-12-29 | 2021-05-05 | Penn Color, Inc. | Polyester packaging material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004339403A (en) * | 2003-05-16 | 2004-12-02 | Toray Ind Inc | Light-reflecting film |
| WO2005026241A1 (en) * | 2003-09-11 | 2005-03-24 | Teijin Dupont Films Japan Limited | Polyester film |
| US7261934B2 (en) | 2003-09-11 | 2007-08-28 | Teijin Dupont Films Japan Limited | Polyester film |
| JP2006021373A (en) * | 2004-07-07 | 2006-01-26 | Toray Ind Inc | White polyester film |
| JP2007015315A (en) * | 2005-07-11 | 2007-01-25 | Teijin Dupont Films Japan Ltd | Laminated film |
| JP5173417B2 (en) * | 2005-07-11 | 2013-04-03 | 帝人デュポンフィルム株式会社 | Laminated film |
| JP2007178998A (en) * | 2005-12-01 | 2007-07-12 | Sekisui Film Kk | Reflective film, reflective laminated film and reflective laminated board |
| JP2008030459A (en) * | 2006-07-07 | 2008-02-14 | Toray Ind Inc | White laminated polyester film for reflective sheet |
| KR101186833B1 (en) | 2006-10-27 | 2012-09-28 | 도레이 카부시키가이샤 | White polyester film for liquid crystal display reflector |
| WO2008053740A1 (en) * | 2006-10-27 | 2008-05-08 | Toray Industries, Inc. | White polyester film for liquid crystal display reflector |
| JP5526477B2 (en) * | 2006-10-27 | 2014-06-18 | 東レ株式会社 | White polyester film for LCD reflector |
| WO2008093623A1 (en) | 2007-01-31 | 2008-08-07 | Toray Industries, Inc. | White polyester film and reflective sheet |
| US8197931B2 (en) | 2007-01-31 | 2012-06-12 | Toray Industries, Inc. | White polyester film and reflection sheet |
| JP2009051175A (en) * | 2007-08-29 | 2009-03-12 | Teijin Dupont Films Japan Ltd | Biaxially stretched laminated film for reflectors |
| JP2009244749A (en) * | 2008-03-31 | 2009-10-22 | Furukawa Electric Co Ltd:The | Light reflective plate |
| WO2010074312A1 (en) * | 2008-12-25 | 2010-07-01 | 住友化学株式会社 | Light diffusion plate |
| EP3592555B1 (en) | 2017-12-29 | 2021-05-05 | Penn Color, Inc. | Polyester packaging material |
| US11760873B2 (en) | 2017-12-29 | 2023-09-19 | Penn Color, Inc. | Polyester packaging material |
| US12098274B2 (en) | 2017-12-29 | 2024-09-24 | Penn Color, Inc. | Polyester packaging material |
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