JPH11262990A - White polyester film - Google Patents

White polyester film

Info

Publication number
JPH11262990A
JPH11262990A JP10068172A JP6817298A JPH11262990A JP H11262990 A JPH11262990 A JP H11262990A JP 10068172 A JP10068172 A JP 10068172A JP 6817298 A JP6817298 A JP 6817298A JP H11262990 A JPH11262990 A JP H11262990A
Authority
JP
Japan
Prior art keywords
film
whiteness
main component
white polyester
polyester film
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
Application number
JP10068172A
Other languages
Japanese (ja)
Inventor
Takashi Mimura
尚 三村
Shigemi Seki
重己 関
Hisashi Owatari
寿士 大渡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toray Industries Inc
Original Assignee
Toray Industries Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toray Industries Inc filed Critical Toray Industries Inc
Priority to JP10068172A priority Critical patent/JPH11262990A/en
Publication of JPH11262990A publication Critical patent/JPH11262990A/en
Pending legal-status Critical Current

Links

Landscapes

  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent a decrease in whiteness when used outdoor by providing a laminate film containing a polyethylene-2,6-naphthalate as a main component at least on one side surface of a base material film containing a polyethylene terephthalate as a main component. SOLUTION: A base material film contains a polyethylene terephthalate as a main component. A laminate film containing a polyethylene-2,6-naphthalate as a main component is provided at least on one side surface of the material film. Here, the main component means, for example, 80 wt.% or more of a resin component in the film and the laminate film. As other component, various copolymers of polyester except the main component. Further, to give whiteness, a white inorganic pigment is contained in the material film and/or the laminate film. Thus, durability of excellent whiteness can be performed.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、白色ポリエステル
フィルムに関し、更に詳しくは白色度の耐久性に優れた
白色ポリエステルフィルムに関する。
The present invention relates to a white polyester film, and more particularly to a white polyester film having excellent whiteness durability.

【0002】[0002]

【従来の技術】従来、白色ポリエステルフィルムとして
は、ポリエチレンテレフタレート中に白色無機粒子を充
填し、必要に応じて蛍光増白剤が併用されたものが多く
使用されていた。
2. Description of the Related Art Conventionally, as a white polyester film, a film in which white inorganic particles are filled in polyethylene terephthalate and a fluorescent whitening agent is used in combination as needed has been widely used.

【0003】[0003]

【発明が解決しようとする課題】しかし、従来の白色ポ
リエステルフィルムは紫外線による劣化により、その特
徴である白度が低下するという、実質的に白色フィルム
にとって致命的な欠点を有していたため、特に屋外での
用途では使用に限界があった。
However, the conventional white polyester film has a fatal disadvantage that the whiteness, which is a characteristic of the conventional white polyester film, is deteriorated due to deterioration by ultraviolet rays. There is a limit to use in outdoor applications.

【0004】本発明は、このような欠点を改良し、屋外
での使用においても白色度の低下が少ない白色ポリエス
テルフィルムを提供するものである。
The present invention has been made to solve the above-mentioned drawbacks and to provide a white polyester film having a small decrease in whiteness even when used outdoors.

【0005】[0005]

【課題を解決するための手段】本発明は、ポリエチレン
テレフタレートを主たる構成成分とする基材フィルムの
少なくとも片面に、ポリエチレン−2、6−ナフタレー
トを主たる構成成分とする積層膜が設けられてなること
を特徴とする白色ポリエステルフィルムをその骨子とす
るものであり、更に好ましくは該積層膜中に紫外線吸収
剤を含有することを特徴とする。
According to the present invention, a laminated film mainly composed of polyethylene-2,6-naphthalate is provided on at least one surface of a base film mainly composed of polyethylene terephthalate. The main feature thereof is a white polyester film characterized by the following, and more preferably, an ultraviolet absorber is contained in the laminated film.

【0006】[0006]

【発明の実施の形態】本発明は、少なくとも2層、好ま
しくは3層から構成される白色ポリエステルフィルムで
あって、その基材フィルムはポリエチレンテレフタレー
トを主たる構成成分とする。ここで、ポリエチレンテレ
フタレートを主たる構成成分とするとは、基材フィルム
を構成する樹脂成分の80重量%以上、好ましくは85
重量%以上、更に好ましくは90重量%以上がポリエチ
レンテレフタレートから成ることを意味するものであ
る。また、この基材フィルムの片面、好ましくは両面に
はポリエチレン−2、6−ナフタレートを主たる構成成
分とする積層膜が設けられる。ここで、ポリエチレン−
2、6−ナフタレートを主たる構成成分とするとは、積
層膜中における樹脂成分の80重量%以上、好ましくは
85重量%以上、更に好ましくは90重量%以上がポリ
エチレン−2、6−ナフタレートからなることを意味す
る。上記、基材フィルムおよび積層膜中に混合し得る他
の成分としては、上記主成分以外のポリエステル樹脂で
あって、具体的にはポリエステルの各種共重合体が好ま
しい。また本発明の白色ポリエステルフィルムの白色性
付与のために、基材フィルムおよび/または積層膜中に
は白色無機顔料を含有させる必要がある。
BEST MODE FOR CARRYING OUT THE INVENTION The present invention is a white polyester film composed of at least two layers, preferably three layers, and its base film is mainly composed of polyethylene terephthalate. Here, the term “polyethylene terephthalate as a main component” means that the resin component constituting the base film is 80% by weight or more, preferably 85% by weight.
By weight means at least 90% by weight, more preferably at least 90% by weight, of polyethylene terephthalate. In addition, a laminated film containing polyethylene-2,6-naphthalate as a main component is provided on one side, preferably both sides, of the base film. Where polyethylene-
2,6-Naphthalate as a main component means that 80% by weight or more, preferably 85% by weight or more, more preferably 90% by weight or more of polyethylene-2,6-naphthalate of the resin component in the laminated film. Means The other components that can be mixed in the base film and the laminated film are polyester resins other than the above main components, and specifically, various copolymers of polyester are preferable. In order to impart whiteness to the white polyester film of the present invention, it is necessary to include a white inorganic pigment in the base film and / or the laminated film.

【0007】白色無機顔料としては、従来から用いられ
ているものが使用され、例えばアナターゼ型、ルチル型
の二酸化チタン、硫酸バリウム、酸化亜鉛、炭酸カルシ
ウムなどが好ましく使用することができる。白色無機顔
料は基材フィルムのみでもよく、積層膜のみでもよい
が、好ましくは両方に含有させるのが望ましい。
As the white inorganic pigment, those conventionally used are used. For example, anatase-type or rutile-type titanium dioxide, barium sulfate, zinc oxide, calcium carbonate and the like can be preferably used. The white inorganic pigment may be contained only in the base film or only in the laminated film, but is preferably contained in both.

【0008】白色無機顔料の添加量は、目的とする白色
度を得るために顔料種によって調整することができる。
例えば、白色度80%以上を得る場合には、基材フィル
ム側に7〜15重量%の二酸化チタン、積層膜中に2〜
10重量%の二酸化チタンを含有させること、もしくは
基材フィルムに10〜20重量%の硫酸バリウムあるい
は炭酸カルシウム、積層膜に2〜10重量%の二酸化チ
タンを含有させることによって達成しうる。ここで、積
層膜中に添加する白色無機顔料は、粒子サイズが小さい
ものが良く、かつ添加量は基材フィルムより少ない方が
白色ポリエステルフィルムの表面光沢が優れたものとす
ることができるのでより好ましい。白色無機顔料の粒子
径は、1μm以下、好ましくは0.5μm以下、更に好
ましくは0.3μm以下であることが白色度の点で好ま
しい。
[0008] The amount of the white inorganic pigment to be added can be adjusted according to the kind of the pigment in order to obtain the desired whiteness.
For example, when whiteness of 80% or more is to be obtained, 7 to 15% by weight of titanium dioxide is provided on the substrate film side,
It can be achieved by containing 10% by weight of titanium dioxide, or 10 to 20% by weight of barium sulfate or calcium carbonate in the base film and 2 to 10% by weight of titanium dioxide in the laminated film. Here, the white inorganic pigment to be added to the laminated film, the smaller the particle size is better, and the amount of addition is smaller than that of the base film because the surface gloss of the white polyester film can be excellent, so that preferable. The particle diameter of the white inorganic pigment is preferably 1 μm or less, preferably 0.5 μm or less, and more preferably 0.3 μm or less, in terms of whiteness.

【0009】本発明の白色ポリエステルフィルムの厚み
は、用途に応じて自在に設定すればよいが、通常25μ
mから500μmの範囲が最も使用範囲が広いので、一
般的である。また、積層膜の厚みは、白色度の耐久性の
点から2μm以上50μm以下、好ましくは3μm以上
20μm以下であることが望ましい。
The thickness of the white polyester film of the present invention may be freely set according to the intended use.
The range from m to 500 μm is the most widely used and is therefore common. Further, the thickness of the laminated film is desirably 2 μm or more and 50 μm or less, preferably 3 μm or more and 20 μm or less from the viewpoint of durability of whiteness.

【0010】本発明の白色ポリエステルフィルムは、二
軸延伸されていることが、白色度、機械的強度、平面性
などの点で好ましい。また積層膜は、共押し出しによっ
て積層させたものが、界面の密着性の点で好ましい。
The white polyester film of the present invention is preferably biaxially stretched in terms of whiteness, mechanical strength, flatness and the like. Further, the laminated film is preferably laminated by co-extrusion in terms of interface adhesion.

【0011】本発明の白色ポリエステルフィルムは上記
構成でも目的を達成しうるが、より好ましくは、積層膜
中に紫外線吸収剤を含有させることにより、より白色度
の耐久性に優れたものとすることができる。好ましい紫
外線吸収剤としては、ベンゾフェノン系、ベンゾトリア
ゾール系、トリアジン系、シアノアクリレート系、サリ
チル酸エステル系、ベンゾエート系、蓚酸アニリド系お
よび無機系の紫外線遮蔽剤なども用いることができる。
もちろん、基材フィル中にも紫外線吸収剤を含有させて
も良いが、コスト面や、白色度の耐久性の点から積層膜
中に含有させた方が有利である。
[0011] The white polyester film of the present invention can achieve the object even with the above-mentioned constitution, but more preferably, it should be more excellent in durability of whiteness by including an ultraviolet absorber in the laminated film. Can be. As preferred UV absorbers, benzophenone-based, benzotriazole-based, triazine-based, cyanoacrylate-based, salicylate-based, benzoate-based, oxalic anilide-based and inorganic UV-screening agents can be used.
Of course, an ultraviolet absorber may be contained in the base film, but it is more advantageous to contain it in the laminated film from the viewpoint of cost and durability of whiteness.

【0012】本発明の白色ポリエステルフィルムは、各
種受像フィルム基材、例えばインクジェット、感熱転写
などの受像フィルム基材、写真用基材、オフセット印刷
などの印刷用基材、液晶反射板基材、磁気カードやIC
カード用などとして有効に使用でき、特に屋外用のポス
ターや電飾看板などの基材として有用である。
The white polyester film of the present invention may be any of various image-receiving film substrates, for example, an image-receiving film substrate for ink jet or thermal transfer, a photographic substrate, a printing substrate for offset printing or the like, a liquid crystal reflecting plate substrate, a magnetic substrate. Cards and ICs
It can be used effectively for cards and the like, and is particularly useful as a base material for outdoor posters and illuminated signs.

【0013】また、本発明の白色ポリエステルフィルム
は、紙等と積層されて使用することもできる。
Further, the white polyester film of the present invention can be used by being laminated on paper or the like.

【0014】[0014]

【効果の評価方法】A.白色度 日立分光光度計EPE−2を用いてタングステン光源で
測定した450nmおよび550nmにおけるフィルム
の各反射率R450(%)、R550(%)から次式によって
算出した。 白色度(%)=4R450−3R550 B.白色度の耐久性 紫外線劣化促進試験機アイスーパーUVテスターSUV
ーW131(岩崎電気(株)製)を用いて下記の条件で
5サイクルの照射サイクルテストを行った後、その照射
面の白色度を上記Aの方法で測定した。
[Evaluation method of effect] A. The degree of whiteness was calculated from the respective reflectances R450 (%) and R550 (%) of the film at 450 nm and 550 nm measured with a tungsten light source using a Hitachi spectrophotometer EPE-2 according to the following equation. Whiteness (%) = 4R450-3R550 Durability of Whiteness UV Deterioration Acceleration Testing Machine Eye Super UV Tester SUV
After performing an irradiation cycle test of 5 cycles under the following conditions using -W131 (manufactured by Iwasaki Electric Co., Ltd.), the whiteness of the irradiated surface was measured by the method A described above.

【0015】ライト8時間(照度100mW/cm2
温湿度60℃×50%RH)+デュー8時間(温湿度3
5℃×100%RH(結露))+レスト8時間(温湿度
35℃×70%RH)を1サイクルとした。
Light 8 hours (illuminance 100 mW / cm 2 ,
Temperature / humidity 60 ° C x 50% RH) + Dew 8 hours (temperature / humidity 3)
One cycle was 5 ° C. × 100% RH (condensation)) + rest for 8 hours (temperature and humidity 35 ° C. × 70% RH).

【0016】[0016]

【実施例】以下、実施例を用いて本発明を説明するが、
本発明は必ずしもこれに限定されるものではない。
Hereinafter, the present invention will be described with reference to Examples.
The present invention is not necessarily limited to this.

【0017】実施例1 1台の主押し出し機と1台の副押し出し機が合流して積
層フィルムを作成できる複合製膜装置を用い、1台の主
押し出し機に平均粒子径0.35μmの硫酸バリウムを
10重量%含有したポリエチレンテレフタレート樹脂
を、1台の副押し出し機に平均粒子径0.18μmのア
ナターゼ型二酸化チタンを5重量%含有したポリエチレ
ン−2、6−ナフタレート樹脂をそれぞれ供給した。な
お、それぞれの供給原料は、あらかじめ180℃で4時
間、真空乾燥した後、供給した。
Example 1 A single extruder and one sub-extruder were combined and a composite film forming apparatus capable of forming a laminated film was used, and sulfuric acid having an average particle diameter of 0.35 μm was added to one main extruder. Polyethylene terephthalate resin containing 10% by weight of barium was supplied to one sub-extruder, and polyethylene-2,6-naphthalate resin containing 5% by weight of anatase type titanium dioxide having an average particle diameter of 0.18 μm was supplied to each of the extruders. In addition, each feed material was supplied after being vacuum-dried at 180 ° C. for 4 hours in advance.

【0018】2台の押し出し機とも約285℃に加熱
し、所定の方法によって溶融押し出しし、静電印加法に
より鏡面のキャストドラム上で冷却して主/副厚み比9
5/5の積層シートを作成した。このシートを85℃で
長手方向に3.5倍延伸し、連続的に端部をクリップで
把持しつつ、テンター内に導き、85℃の予熱ゾーンを
通して92℃で幅方向に3.6倍延伸し、更に225℃
で5秒間熱処理を行い、積層厚み比95/5、厚み10
0μmの複合フィルムを作成した。
Both extruders are heated to about 285 ° C., melt-extruded by a predetermined method, and cooled on a mirror-finished cast drum by an electrostatic application method to obtain a main / sub thickness ratio of 9
A 5/5 laminated sheet was prepared. This sheet is stretched 3.5 times in the longitudinal direction at 85 ° C., guided into a tenter while continuously gripping the ends with clips, and stretched 3.6 times in the width direction at 92 ° C. through a preheating zone of 85 ° C. And then 225 ° C
Heat treatment for 5 seconds at a laminate thickness ratio of 95/5 and a thickness of 10
A 0 μm composite film was made.

【0019】このフィルムの白色度は98%、紫外線照
射後で88%であった。
The whiteness of this film was 98% and 88% after irradiation with ultraviolet rays.

【0020】実施例2 上述の副押し出し機に供給する原料中に紫外線吸収剤と
してTinuvin−320(Geigy社製)を2重
量%添加した以外は実施例1と同様にして積層フィルム
を作成した。このフィルムの白色度は96%、紫外線照
射後で92%であった。
Example 2 A laminated film was prepared in the same manner as in Example 1, except that 2% by weight of Tinuvin-320 (manufactured by Geigy Corporation) was added as an ultraviolet absorber to the raw materials supplied to the above-mentioned sub-extruder. The whiteness of this film was 96%, and 92% after UV irradiation.

【0021】比較例1 実施例1の副押し出し機を用いず、主押し出し機のみを
用い、主押し出し機に供給する原料のみを用いた以外
は、実施例1と同様にして単層フィルムを作成した。こ
のフィルムの白色度は95%、紫外線照射後は58%で
あった。
Comparative Example 1 A single-layer film was prepared in the same manner as in Example 1, except that only the main extruder was used, and only the raw material supplied to the main extruder was used without using the sub-extruder of Example 1. did. The whiteness of this film was 95% and that after irradiation with ultraviolet rays was 58%.

【0022】[0022]

【発明の効果】本発明は 特定の樹脂を用いた複合構成
とすることにより、白色度の耐久性に優れた白色ポリエ
ステルフィルムとすることができる。
According to the present invention, by forming a composite structure using a specific resin, a white polyester film having excellent whiteness durability can be obtained.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 FI // B29K 67:00 B29L 7:00 9:00 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI // B29K 67:00 B29L 7:00 9:00

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】ポリエチレンテレフタレートを主たる構成
成分とする基材フィルムの少なくとも片面に、ポリエチ
レン−2、6−ナフタレートを主たる構成成分とする積
層膜が設けられてなることを特徴とする白色ポリエステ
ルフィルム。
1. A white polyester film comprising a base film mainly composed of polyethylene terephthalate and a laminated film mainly composed of polyethylene-2,6-naphthalate provided on at least one surface of the substrate film.
【請求項2】少なくとも積層膜中に紫外線吸収剤を含有
することを特徴とする請求項1記載の白色ポリエステル
フィルム。
2. The white polyester film according to claim 1, wherein at least the laminated film contains an ultraviolet absorber.
JP10068172A 1998-03-18 1998-03-18 White polyester film Pending JPH11262990A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10068172A JPH11262990A (en) 1998-03-18 1998-03-18 White polyester film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10068172A JPH11262990A (en) 1998-03-18 1998-03-18 White polyester film

Publications (1)

Publication Number Publication Date
JPH11262990A true JPH11262990A (en) 1999-09-28

Family

ID=13366099

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10068172A Pending JPH11262990A (en) 1998-03-18 1998-03-18 White polyester film

Country Status (1)

Country Link
JP (1) JPH11262990A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002098808A (en) * 2000-09-25 2002-04-05 Toray Ind Inc White laminated polyester film for reflecting member of planar light source
JP2008200861A (en) * 2007-02-16 2008-09-04 Toray Ind Inc Laminated film and molded decorative film for cellular phone

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002098808A (en) * 2000-09-25 2002-04-05 Toray Ind Inc White laminated polyester film for reflecting member of planar light source
JP2008200861A (en) * 2007-02-16 2008-09-04 Toray Ind Inc Laminated film and molded decorative film for cellular phone

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