JP2010280162A - Multilayered sheet and method for manufacturing the same - Google Patents
Multilayered sheet and method for manufacturing the same Download PDFInfo
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- JP2010280162A JP2010280162A JP2009136232A JP2009136232A JP2010280162A JP 2010280162 A JP2010280162 A JP 2010280162A JP 2009136232 A JP2009136232 A JP 2009136232A JP 2009136232 A JP2009136232 A JP 2009136232A JP 2010280162 A JP2010280162 A JP 2010280162A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 31
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 23
- 238000001816 cooling Methods 0.000 claims abstract description 13
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 7
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 11
- 229920000728 polyester Polymers 0.000 description 8
- -1 polyethylene terephthalate Polymers 0.000 description 7
- 239000000155 melt Substances 0.000 description 6
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 5
- 210000003205 muscle Anatomy 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 4
- 125000003118 aryl group Chemical group 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 239000000049 pigment Substances 0.000 description 3
- 229920006267 polyester film Polymers 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 238000006068 polycondensation reaction Methods 0.000 description 2
- 239000012463 white pigment Substances 0.000 description 2
- ISPYQTSUDJAMAB-UHFFFAOYSA-N 2-chlorophenol Chemical compound OC1=CC=CC=C1Cl ISPYQTSUDJAMAB-UHFFFAOYSA-N 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- RXOHFPCZGPKIRD-UHFFFAOYSA-N naphthalene-2,6-dicarboxylic acid Chemical compound C1=C(C(O)=O)C=CC2=CC(C(=O)O)=CC=C21 RXOHFPCZGPKIRD-UHFFFAOYSA-N 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000005809 transesterification reaction Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000004034 viscosity adjusting agent Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Laminated Bodies (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
本発明は、熱可塑性樹脂フィルムなどからなる多層シートとこの多層シートの製造方法に関する。 The present invention relates to a multilayer sheet made of a thermoplastic resin film and the like and a method for producing the multilayer sheet.
液晶テレビには、画面の輝度を向上させるために、バックライトを反射するシートとして反射率が高く隠蔽性の高い白色フィルムが用いられている。このような白色フィルムでは熱可塑性樹脂フィルム中に例えば無機顔料を大量に含有させることで反射率と輝度の向上が認められる場合がある。 In a liquid crystal television, a white film having high reflectivity and high concealment is used as a sheet for reflecting a backlight in order to improve screen brightness. In such a white film, an increase in reflectance and brightness may be recognized by containing, for example, a large amount of an inorganic pigment in the thermoplastic resin film.
前述のような熱可塑性樹脂フィルム等からなるシートを製造するための代表的な方法として、熱可塑性樹脂の溶融物をダイリップから押出し、冷却ドラムで急冷固化させる方法が挙げられる。ただし、この製造方法ではダイリップから熱可塑性樹脂を溶融押出しする際に溶融物中の含有物や酸化物がダイに付着するが、このような付着物が成長すると筋状の欠点となり良好な製品フィルムが得られ難くなる等の問題が生じる。 As a typical method for producing a sheet made of the thermoplastic resin film as described above, there is a method of extruding a thermoplastic resin melt from a die lip and rapidly cooling and solidifying it with a cooling drum. However, in this manufacturing method, when the thermoplastic resin is melt-extruded from the die lip, the contents and oxides in the melt adhere to the die. The problem that it becomes difficult to obtain is caused.
そこで、このような問題を解消するために特許文献１において、熱可塑性樹脂を溶融押出するダイに対してセラミック被覆を施し、熱可塑性樹脂との離れ性を向上させることが提案されている。しかしながら、セラミックスは一般に硬度は高いが靱性に乏しく衝撃を受けると欠け易い材料である。このため、付着物を取り除くためにセラミックスで被覆されたシャープエッジを有するダイリップの先端を金属ヘラで掻く際に欠けが生じるという問題がある。 Therefore, in order to solve such a problem, Patent Document 1 proposes that a die for melting and extruding a thermoplastic resin is coated with a ceramic to improve the separation property from the thermoplastic resin. However, ceramics are generally materials that have high hardness but poor toughness and are easily chipped upon impact. For this reason, there is a problem that chipping occurs when the tip of a die lip having a sharp edge coated with ceramics is scraped with a metal spatula to remove deposits.
また、特許文献２には、ダイ筋の発生を抑制する方法として、熱可塑性樹脂チップの水分率を４０〜６０ｐｐｍの範囲に制御する方法が開示されている。しかしながら、この方法を適用したチップを使用して得られたフィルムでは、その固有粘度が下がり過ぎ延伸工程でフィルムが切断するという問題がある。
本発明の目的は、上記従来技術では解決できなかったダイ筋を抑制するという課題に対し、熱可塑性樹脂フィルムなどからなるシートに大量の不活性粒子が含まれていてもダイ筋の発生を抑制でき、長時間にわたって連続生産できる多層シートとその製造方法を提供することにある。 The object of the present invention is to suppress the generation of die streak even when a large amount of inactive particles are contained in a sheet made of a thermoplastic resin film, etc., against the problem of suppressing die streak that could not be solved by the above-mentioned conventional technology. It is possible to provide a multilayer sheet that can be produced continuously over a long period of time and a method for producing the same.
ここに、前記課題を解決するための発明として、「不活性粒子２０〜６０重量％を含有する熱可塑性樹脂からなるＡ層と不活性粒子２０〜６０重量％を含有する熱可塑性樹脂からなるＢ層を２層以上交互に重ねてダイよりシート状に押し出しキャストする方法において、少なくとも前記Ｂ層が片面に露出しておりそのＢ層側を冷却ドラムに接触させて着地させることを特徴とする多層シートの製造方法」が提供される。
このとき、本発明においては、前記不活性粒子が硫酸バリウムおよび／または酸化チタンであることが好ましい。
Here, as an invention for solving the above-mentioned problem, “A layer made of a thermoplastic resin containing 20 to 60% by weight of inert particles and B made of a thermoplastic resin containing 20 to 60% by weight of inert particles”. In the method in which two or more layers are alternately stacked and extruded and cast in a sheet form from a die, at least the B layer is exposed on one side, and the B layer side is brought into contact with a cooling drum for landing. A sheet manufacturing method "is provided.
At this time, in the present invention, the inert particles are preferably barium sulfate and / or titanium oxide.
本発明によればシートに大量の不活性粒子が含まれていてもダイ筋の発生を抑制できる。 According to the present invention, even when a large amount of inert particles are contained in the sheet, the generation of die streaks can be suppressed.
以下、本発明の実施形態について図面を参照しながら説明する。図１及び図２は、本発明の多層シートの製造方法に係る一実施形態を例示した側面図であり、符号１はダイ、符号２は冷却ドラム、符号３はメルト、符号４はシートをそれぞれ示す。
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 are side views illustrating an embodiment of the method for producing a multilayer sheet according to the present invention. Reference numeral 1 is a die,
本発明に係る多層シートの製造方法では、乾燥後の熱可塑性樹脂チップを図示省略した２台の押出機に供給して溶融し、ダイ１より押し出してメルト３としてシート状に成形する。その後、回転冷却ドラム２上で急冷固化して多層シート４を得る。
In the method for producing a multilayer sheet according to the present invention, the dried thermoplastic resin chips are supplied to two extruders (not shown), melted, extruded from the die 1 and formed into a sheet form as a melt 3. Thereafter, the multilayer sheet 4 is obtained by rapid solidification on the
本発明でいう「ダイ筋」とは、シート押出し成形方向の断面で観察すると凸状、または凹状形状を示すものである。例えば、ポリエステルシートの表面に押出し方向と同一方向に凸状の筋、または凹み状の筋となる欠陥をいう。 The “die bar” as used in the present invention indicates a convex shape or a concave shape when observed in a cross section in the sheet extrusion molding direction. For example, it refers to a defect that becomes a convex streak or a concave streak in the same direction as the extrusion direction on the surface of a polyester sheet.
なお、このダイ筋は、厚さ１００μｍのシートに対して、０．２〜２μｍ程度の高さ、または深さの筋を有する場合が多く、大きいものは肉眼でも観察し得る。このようなダイ筋が発生すると、すぐに生産を中断して、銅等の金属へらでダイリップへ付着した付着物を除去清掃しなければならない。 The die streaks often have streaks having a height or depth of about 0.2 to 2 μm with respect to a sheet having a thickness of 100 μm, and large ones can be observed with the naked eye. When such die streaks occur, production must be interrupted immediately, and the deposits adhering to the die lip must be removed and cleaned with a metal spatula such as copper.
このダイ筋の発生を抑制を評価する尺度としては、ダイ筋が管理限界を超えた高さになりリップ清掃をするまでの連続生産日数を採用することができ、このような評価試験から、不活性粒子を多く含む樹脂ほどダイ筋が発生しやすく、清掃までの連続生産日数が短い傾向と判ってきた。 As a measure for evaluating the suppression of the occurrence of die muscle, the continuous production days until the die muscle exceeds the control limit and the lip is cleaned can be adopted. It has been found that a resin containing more active particles is more likely to have die streak and has a shorter number of continuous production days until cleaning.
また、リップ清掃した銅へらから採取した樹脂を分析すると不活性粒子が多めに検出されるもとがわかってきた。そこで、ダイ筋の発生原因が、不活性粒子がダイ吐出口のシャープエッジ付近に付着し、これが核となってシート表面にダイ筋を形成するものと考えられる。 In addition, it has been found that when the resin collected from the lip-cleaned copper spatula is analyzed, a large amount of inert particles are detected. Therefore, it is considered that the cause of the die streak is that the inert particles adhere to the vicinity of the sharp edge of the die discharge port, and this serves as a nucleus to form the die streak on the sheet surface.
本発明では図２のように不活性粒子を大量に含有する熱可塑性樹脂からなるＢ層が最表層に露出し、このＢ層を冷却ドラム２に着地させて冷却固化し、ダイ筋を抑制することを特徴とする。本発明の方法によると、熱可塑性樹脂が溶融状態から固化する途中のメルト３は柔らかいので、ダイリップから出て冷却ドラムに着地させて密着させることでＢ層のメルト表面が平坦化されダイ筋を平坦化することができる。
In the present invention, as shown in FIG. 2, a B layer made of a thermoplastic resin containing a large amount of inert particles is exposed on the outermost layer, and this B layer is landed on the
本発明において、反射面を構成する層をＢ層、他方の層をＡ層とすると、白色積層ポリエステルフィルムを構成するポリエステルＡ層は粒子を、好ましくは１〜３０重量％、さらに好ましくは１〜１５重量％含有する。１重量％未満であると滑性が低下して巻取りが難しくなり好ましくなく、３０重量％を超えると破れやすいフィルムとなり、製膜性が低下して好ましくない。 In this invention, when the layer which comprises a reflective surface is made into B layer and the other layer is made into A layer, the polyester A layer which comprises a white laminated polyester film is a particle | grain, Preferably it is 1 to 30 weight%, More preferably, it is 1 to 1 weight%. Contains 15% by weight. If it is less than 1% by weight, the slipping property is lowered and winding becomes difficult, and if it exceeds 30% by weight, the film is easily broken and the film forming property is lowered, which is not preferable.
他方でＢ層の組成物は不活性粒子を２０〜６０重量％含有する。このとき、２０重量％未満であっても良いがフィルムとしての機能が低下したりする、６０重量％を超えると延伸する際に切断しすくなる。Ｂ層の不活性粒子は、その平均粒径が０．３〜３．０μｍが好ましく、平均粒径が０．３μｍ未満であると分散性が極端に悪くなり、粒子の凝集が起こるため生産工程上のトラブルが発生しやすい。 On the other hand, the composition of layer B contains 20 to 60% by weight of inert particles. At this time, it may be less than 20% by weight, but the function as a film is deteriorated, and when it exceeds 60% by weight, the film becomes easily cut when stretched. The inert particles of layer B preferably have an average particle size of 0.3 to 3.0 μm, and if the average particle size is less than 0.3 μm, the dispersibility becomes extremely poor and the particles are aggregated. The above trouble is likely to occur.
なお、粒子の平均粒径は、島津製作所製ＣＰ―５０型セントリフュグル パーティクル サイズ アナライザー（Ｃｅｎｔｒｉｆｕｇａｌ Ｐａｒｔｉｃｌｅ Ｓｉｚｅ Ａｎａｌｙｚｅｒ）を用いて測定した。得られる遠心沈降曲線を基に算出した各粒径の粒子とその存在量との積算曲線から、５０マスパーセントに相当する粒径を読み取り、この値を上記平均粒径とした（「粒度測定技術」日刊工業新聞社発行、１９７５年、頁２４２〜２４７参照）。 The average particle size of the particles was measured using a CP-50 type Centrifuggle Particle Size Analyzer manufactured by Shimadzu Corporation. A particle size corresponding to 50 mass percent is read from an integrated curve of particles of each particle size calculated based on the obtained centrifugal sedimentation curve and the abundance thereof, and this value is used as the average particle size (see “Particle Size Measurement Technology”). "See Nikkan Kogyo Shimbun, 1975, pages 242-247).
不活性粒子としては、フィルムの可視光透過率を下げ反射性能を向上させる観点では好ましくは白色顔料を用いる。白色顔料としては、例えば、酸化チタン、硫酸バリウム、炭酸カルシウム、二酸化珪素、好ましくは、硫酸バリウムおよび／または酸化チタンを用いる。硫酸バリウムは板状、球状いずれの粒子形状でもよい。硫酸バリウムを用いることで一層良好な反射率を得ることができる。酸化チタンを用いる場合、ルチル型酸化チタンを例示できる。 As the inert particles, a white pigment is preferably used from the viewpoint of reducing the visible light transmittance of the film and improving the reflection performance. As the white pigment, for example, titanium oxide, barium sulfate, calcium carbonate, silicon dioxide, preferably barium sulfate and / or titanium oxide are used. Barium sulfate may have a plate-like or spherical particle shape. By using barium sulfate, better reflectance can be obtained. When titanium oxide is used, a rutile type titanium oxide can be exemplified.
本発明において、多層シートは熱可塑性樹脂を従来から知られる方法で２層以上に積層してダイより押出して得られる。このようなダイとしては、例えばダイ内で２層以上の溶融樹脂が層状に合流可能な多層押出用ダイを挙げることができる。なお、フィードブロックにより２層以上の溶融樹脂が層状に合流できるダイであってもよい。 In the present invention, the multilayer sheet is obtained by laminating a thermoplastic resin into two or more layers by a conventionally known method and extruding from a die. Examples of such a die include a multilayer extrusion die in which two or more layers of molten resin can be combined in a layer form within the die. In addition, the die | dye which can join two or more layers of molten resin into a layer form by a feed block may be sufficient.
多層シート４は、次いでロール、ステンター等により逐次に、あるいは同時に縦、横の二軸方向に延伸してフィルムに成形して良く、従来公知の方法が適用できる。例えば、ロール周速差などにより縦方向に２〜６倍、ステンター法等により横方向に２〜６倍、逐次延伸し、１６０〜２５０℃程度の熱固定を行う方法を挙げることができる。 The multilayer sheet 4 may then be formed into a film by stretching it in the longitudinal and lateral biaxial directions sequentially or simultaneously with a roll, a stenter or the like, and conventionally known methods can be applied. For example, a method in which the film is stretched by 2 to 6 times in the longitudinal direction due to a difference in roll peripheral speed or the like and 2 to 6 times in the lateral direction by a stenter method or the like, and heat fixed at about 160 to 250 ° C. can be exemplified.
本発明における熱可塑性樹脂は、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレン−２，６−ナフタレート等のポリエステル類、ポリエチレン、ポリプロピレン等のポリオレフィン類、ナイロン６、ナイロン６６等のポリアミド類、ポリイミド類、ポリスチレン類、ポリカーボネート類、ポリビニル類等の溶融押出し成形に用いられる樹脂である。 The thermoplastic resin in the present invention includes polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene-2,6-naphthalate, polyolefins such as polyethylene and polypropylene, polyamides such as nylon 6 and nylon 66, polyimides, and polystyrenes. It is a resin used for melt extrusion molding such as polycarbonates and polyvinyls.
本発明は、これらのうち、二軸延伸した際にダイ筋が有ると重要な品質欠陥となるポリエステル類に特に好適である。ポリエステル類とは、ジカルボン酸成分とグリコール成分からなるポリエステルである。このジカルボン酸成分としては、例えばテレフタル酸、イソフタル酸、ナフタレン−２，６−ジカルボン酸の如き芳香族ジカルボン酸が好ましく、またグリコール成分としては、エチレングリコール、ジエチレングリコール、テトラメチレングリコール、ネオペンチルグリコールの如きグリコールが好ましい。 Among these, the present invention is particularly suitable for polyesters that have an important quality defect when there is a die line when biaxially stretched. Polyesters are polyesters composed of a dicarboxylic acid component and a glycol component. The dicarboxylic acid component is preferably an aromatic dicarboxylic acid such as terephthalic acid, isophthalic acid or naphthalene-2,6-dicarboxylic acid. The glycol component is preferably ethylene glycol, diethylene glycol, tetramethylene glycol or neopentyl glycol. Such glycols are preferred.
本発明におけるポリエステルは、例えば芳香族ジカルボン酸とグリコールとを直接重縮合させて得ることができるが、芳香族ジカルボン酸のジアルキルエステルとグリコールとをエステル交換反応させた後重縮合させる方法によっても得ることができる。 The polyester in the present invention can be obtained, for example, by direct polycondensation of aromatic dicarboxylic acid and glycol, but can also be obtained by a method of polycondensation after diesterification of aromatic dicarboxylic acid with glycol and transesterification. be able to.
このようなポリマーの代表例としては、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレン−２，６−ナフタレートを挙げることができる。また、ポリエステルは、これらの共重合体であってもよく、あるいは、これら以外の第３成分を共重合させたものであってもよい。 Representative examples of such polymers include polyethylene terephthalate, polybutylene terephthalate, and polyethylene-2,6-naphthalate. The polyester may be a copolymer of these, or may be a copolymer of a third component other than these.
上記熱可塑性樹脂には、安定剤、滑剤、ピンニング剤、粘度調整剤、酸化防止剤、顔料、着色染料、蛍光増白剤、紫外線吸収剤、帯電防止剤等を含有させてもよい。 The thermoplastic resin may contain stabilizers, lubricants, pinning agents, viscosity modifiers, antioxidants, pigments, coloring dyes, fluorescent brighteners, ultraviolet absorbers, antistatic agents, and the like.
以下、実施例によって本発明を更に説明する。なお、表中のダイ筋発生時間は下記の要領で評価した。
（１）ダイ筋発生時間の評価
ダイ筋の限度見本として２軸延伸後のポリエステルフィルムでダイ筋の高さ１ｕｍのものを用意した。この見本と製膜中の２軸延伸フィルムの両面を目視で観察比較し、見本より筋が目立つ時までの経過時間をダイ筋発生時間とし、その後リップ清掃を行った。
Hereinafter, the present invention will be further described by way of examples. The die muscle generation time in the table was evaluated in the following manner.
(1) Evaluation of die line generation time As a limit sample of die line, a polyester film after biaxial stretching having a die line height of 1 μm was prepared. The sample and both sides of the biaxially stretched film during film formation were visually observed and compared, and the elapsed time from the sample until when the streak was conspicuous was defined as the die streak generation time, and then lip cleaning was performed.
［実施例１］
まず図１に示す構成の装置を用い、Ｂ層が冷却ドラム２に着地するようにして２層シートを作成した。
熱可塑性樹脂として固有粘度（オルトクロロフェノール、３５℃）０．６４ｄｌ／ｇのイソフタル酸ポリエチレンテレフタレートで共重合成分が１２ｍｏｌ％に、平均粒径０．８μｍの硫酸バリウムをＡ層に４重量％含有させ、Ｂ層に５０重量％含有させたものを準備した。
ついで、２台の押出機に投入し、吐出重量比をＡ層：Ｂ層＝１：３に設定しフィードブロックでＡ層とＢ層を２層に重ね合わせ２７０℃に加熱されたダイ１から押し出してメルト３とし、表面温度２０℃、周速１５ｍ／分の冷却ドラム２に接触させて急冷固化させ２層シート４とした。ついで、９０℃、３．２倍で縦延伸した後、１２０℃、３．４倍で横延伸し、１８８ｕｍの２軸延伸ポリエステルフィルムを連続して巻き取った。
ダイ筋発生までの時間は約４０時間であった。
[Example 1]
First, using the apparatus having the configuration shown in FIG. 1, a two-layer sheet was prepared such that the B layer landed on the
Polyethylene terephthalate with an intrinsic viscosity (orthochlorophenol, 35 ° C.) of 0.64 dl / g as a thermoplastic resin contains 12 mol% of copolymer components and 4 wt% of barium sulfate with an average particle size of 0.8 μm in the A layer. And a layer containing 50% by weight in layer B was prepared.
Next, the die 1 was put into two extruders, the discharge weight ratio was set to A layer: B layer = 1: 3, and the A layer and the B layer were superposed on the two layers by a feed block and heated to 270 ° C. Extruded to form a melt 3 and brought into contact with a
Time to die muscle generation was about 40 hours.
[実施例２、３]
Ｂ層の顔料濃度を変更した以外は実施例１と同様の条件で製膜した。
[Examples 2 and 3]
A film was formed under the same conditions as in Example 1 except that the pigment concentration of the B layer was changed.
[実施例４]
Ａ層とＢ層の顔料を変更した以外は実施例１と同様の条件で製膜した。
[Example 4]
A film was formed under the same conditions as in Example 1 except that the pigments of the A layer and the B layer were changed.
[比較例１〜４]
冷却ドラムへの着地をＡ層にする以外は、実施例と同様の条件で製膜した。ダイ筋発生時間は極めて短い結果となった。
[Comparative Examples 1-4]
A film was formed under the same conditions as in the example except that the landing on the cooling drum was A layer. The die muscle generation time was extremely short.
１ ダイ
２ 冷却ドラム
３ メルト
４ シート
1
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50146685A (en) * | 1974-05-17 | 1975-11-25 | ||
| JPH09234832A (en) * | 1995-12-28 | 1997-09-09 | Mitsubishi Gas Chem Co Inc | Oxygen absorbing multi-layer film and its manufacture |
| JP2000202972A (en) * | 1999-01-12 | 2000-07-25 | Toyobo Co Ltd | Void-containing polyester film |
| JP2001171062A (en) * | 1999-12-21 | 2001-06-26 | Toyobo Co Ltd | White polyester film laminate |
| JP2007320238A (en) * | 2006-06-02 | 2007-12-13 | Teijin Dupont Films Japan Ltd | Laminated film |
| JP2007328150A (en) * | 2006-06-08 | 2007-12-20 | Teijin Dupont Films Japan Ltd | White reflection film |
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- 2009-06-05 JP JP2009136232A patent/JP5632138B2/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50146685A (en) * | 1974-05-17 | 1975-11-25 | ||
| JPH09234832A (en) * | 1995-12-28 | 1997-09-09 | Mitsubishi Gas Chem Co Inc | Oxygen absorbing multi-layer film and its manufacture |
| JP2000202972A (en) * | 1999-01-12 | 2000-07-25 | Toyobo Co Ltd | Void-containing polyester film |
| JP2001171062A (en) * | 1999-12-21 | 2001-06-26 | Toyobo Co Ltd | White polyester film laminate |
| JP2007320238A (en) * | 2006-06-02 | 2007-12-13 | Teijin Dupont Films Japan Ltd | Laminated film |
| JP2007328150A (en) * | 2006-06-08 | 2007-12-20 | Teijin Dupont Films Japan Ltd | White reflection film |
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