JP2016185670A - Heat-resistant film - Google Patents

Heat-resistant film Download PDF

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JP2016185670A
JP2016185670A JP2015066559A JP2015066559A JP2016185670A JP 2016185670 A JP2016185670 A JP 2016185670A JP 2015066559 A JP2015066559 A JP 2015066559A JP 2015066559 A JP2015066559 A JP 2015066559A JP 2016185670 A JP2016185670 A JP 2016185670A
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film
adhesive layer
heat
laminated
pet
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JP6883911B2 (en
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雄司 茶木原
Yuji Chakihara
雄司 茶木原
収一 岩永
Shuichi Iwanaga
収一 岩永
博 美濃
Hiroshi Mino
博 美濃
秀幸 山本
Hideyuki Yamamoto
秀幸 山本
義成 康井
Yoshinari Yasui
義成 康井
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Yasui Seiki Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a heat-resistant film comprising a PP film as the base material, in which wrinkles do not occur in the PP film at the time of heating.SOLUTION: The heat-resistant film is formed in such a laminate that an adhesive layer 3 is put on the surface of a PET film 2 and a PP film 4 is put on the surface of the adhesive layer 3, in which wrinkles do not occur in the PP film 4 at the time of heating.SELECTED DRAWING: Figure 1

Description

本発明は、耐熱性フィルムに係り、特にPPフィルム(ポリプロピレンフィルム)をベースとして用いるのに好適な耐熱性フィルムに関する。   The present invention relates to a heat resistant film, and more particularly to a heat resistant film suitable for using a PP film (polypropylene film) as a base.

近年においては、機械的特性、熱的特性、剥離特性等に優れているPPフィルムがその優れた特性から一般民生用、工業用、医療用、宇宙用等の全分野において利用されている。   In recent years, PP films that are excellent in mechanical properties, thermal properties, peeling properties, and the like have been used in all fields such as general consumer, industrial, medical, and space because of their excellent properties.

例えば、PPフィルムに種々の素材を積層した積層体として利用されている(特許文献1〜4参照)。   For example, it is used as a laminate in which various materials are laminated on a PP film (see Patent Documents 1 to 4).

特開2008−087421号公報JP 2008-087421 A 特開2010−234570号公報JP 2010-234570 A 特開2011−143586号公報JP 2011-143586 A 特開2014−100917号公報JP 2014-110197 A

しかしながら、PPフィルムは100℃以上に加熱されると軟化するために、例えばPPフィルムの搬送方向に張力を付与すると縦皺が発生するという不都合があった。例えば、PPフィルムに所望の素材を積層した複合体についても、当該素材およびPPフィルムが共に縦皺のある不良品となってしまうという不都合があった。   However, since the PP film softens when heated to 100 ° C. or higher, for example, when tension is applied in the PP film conveyance direction, there is a disadvantage that vertical wrinkles occur. For example, even for a composite in which a desired material is laminated on a PP film, there is a disadvantage that both the material and the PP film become defective products with vertical lines.

本発明はこれらの点に鑑みてなされたものであり、加熱時にPPフィルムにしわが発生しないPPフィルムを基礎材料とした耐熱性フィルムを提供することを目的とする。   This invention is made | formed in view of these points, and it aims at providing the heat resistant film which used PP film as a basic material in which a wrinkle does not generate | occur | produce in PP film at the time of a heating.

本発明者等は鋭意研究し、PPフィルムの一面側に、粘着層を介してPETフィルム(ポリエチレンテレフタレートフィルム)を積層した積層体とすることによって、加熱時にPPフィルムにしわが発生しないことを発見して本発明を完成させた。   The present inventors have intensively studied and discovered that a PP film (polyethylene terephthalate film) is laminated on one side of the PP film via an adhesive layer, so that the PP film does not wrinkle when heated. The present invention has been completed.

前述した目的を達成するため本発明の第1の態様の耐熱性フィルムは、PETフィルムの表面に粘着層を積層し、前記粘着層の表面にPPフィルムを積層して形成されており、加熱時に前記PPフィルムにしわが発生しない積層体とされていることを特徴とする。   In order to achieve the above-described object, the heat-resistant film of the first aspect of the present invention is formed by laminating an adhesive layer on the surface of a PET film and laminating a PP film on the surface of the adhesive layer. The PP film is a laminate in which wrinkles do not occur.

また、本発明の第2の態様の耐熱性フィルムは、前記PPフィルムが、ホモポリマーをインフレーション法によって2軸延伸して形成されていることを特徴とする。   The heat-resistant film according to the second aspect of the present invention is characterized in that the PP film is formed by biaxially stretching a homopolymer by an inflation method.

また、本発明の第3の態様の耐熱性フィルムは、前記PETフィルムに対する前記PPフィルムの積層は、ウエットラミネート法またはドライラミネート法によって行われたことを特徴とする。   The heat resistant film according to the third aspect of the present invention is characterized in that the PP film is laminated on the PET film by a wet laminating method or a dry laminating method.

本発明の耐熱性フィルムは、加熱時にPPフィルムにしわが発生しないPPフィルムを基礎材料とした耐熱性フィルムを得ることができるという優れた効果を奏する。   The heat resistant film of the present invention has an excellent effect that a heat resistant film based on a PP film that does not generate wrinkles in the PP film upon heating can be obtained.

本発明に係る耐熱性フィルムの一実施形態を示す断面図Sectional drawing which shows one Embodiment of the heat resistant film which concerns on this invention

以下、図1を用いて本発明の耐熱性フィルムの実施形態について説明する。   Hereinafter, an embodiment of the heat resistant film of the present invention will be described with reference to FIG.

図1は本発明の耐熱性フィルムの1実施形態を示す。   FIG. 1 shows one embodiment of the heat resistant film of the present invention.

本実施形態の耐熱性フィルム1は、薄膜状のPETフィルム2の表面に粘着層3を積層し、この粘着層3の表面に薄膜状のPPフィルム4を積層して形成されている。   The heat resistant film 1 of the present embodiment is formed by laminating an adhesive layer 3 on the surface of a thin film PET film 2 and laminating a thin film PP film 4 on the surface of the adhesive layer 3.

PETフィルム2としては、厚さが25〜100μm程度の公知の素材(市販の素材を含む)を用いると良い。   As the PET film 2, a known material (including a commercially available material) having a thickness of about 25 to 100 μm may be used.

粘着層3を形成する粘着素材としては、公知の粘着素材を用いることができる。例えば、ウレタン系粘着材、アクリル系粘着材、UV硬化樹脂系接着剤が挙げられる。また、非シリコーン系の粘着材を用いるとよい。粘着層3の塗布厚さはドライ状態で5〜20μm程度とするとよい。   A known adhesive material can be used as the adhesive material for forming the adhesive layer 3. For example, a urethane-based adhesive material, an acrylic-based adhesive material, and a UV curable resin adhesive can be used. A non-silicone-based adhesive material may be used. The coating thickness of the adhesive layer 3 is preferably about 5 to 20 μm in a dry state.

PPフィルム4としては、厚さが10〜60μm程度の公知の素材(市販の素材を含む)を用いるとよい。特に、ホモポリマーのPPをインフレーション法によって2軸延伸して形成されているものが均一厚さの平坦性を維持するために好適である。更に、PPフィルム4の粘着層3に積層される面に対して、必要に応じてコロナ処理、紫外線照射、EB照射等の公知の改質処理を施すと良い。更に、PPフィルム4の表面の粗さについては、つるつる状、マット状等をその積層体の特性に応じて選択するとよい。   As the PP film 4, a known material (including a commercially available material) having a thickness of about 10 to 60 μm may be used. In particular, a homopolymer PP formed by biaxial stretching by an inflation method is suitable for maintaining flatness with a uniform thickness. Further, the surface of the PP film 4 that is laminated on the adhesive layer 3 may be subjected to a known modification treatment such as corona treatment, ultraviolet irradiation, or EB irradiation as necessary. Furthermore, as for the roughness of the surface of the PP film 4, a slippery shape, a mat shape or the like may be selected according to the characteristics of the laminate.

PETフィルム2に対するPPフィルム4の積層は、ドライラミネート法またはウエットラミネート法によって行うとよい。   The PP film 4 may be laminated on the PET film 2 by a dry lamination method or a wet lamination method.

ドライラミネート法としては、公知の方法を用いることができる。   As the dry laminating method, a known method can be used.

具体的には、PETフィルム2に粘着材を薄く塗布し、その後乾燥させて予め粘着層3を積層したPETフィルム2の当該ドライ状の粘着層3の上にPPフィルム4をラミネートしてPETフィルム2とPPフィルム4とをドライラミネート法によって粘着層3を介して積層する。   Specifically, an adhesive material is thinly applied to the PET film 2 and then dried, and then the PP film 4 is laminated on the dry adhesive layer 3 of the PET film 2 in which the adhesive layer 3 is previously laminated. 2 and the PP film 4 are laminated through the adhesive layer 3 by a dry laminating method.

ウエットラミネート法としては、公知の方法を用いることができる。   As the wet lamination method, a known method can be used.

具体的には、PETフィルム2に粘着素材を薄く塗布し、その後ウエット状の粘着層3の上にPPフィルム4をラミネートし、その後粘着層3を乾燥させてPETフィルム2とPPフィルム4とをウエットラミネート法によって粘着層3を介して積層する。粘着素材の塗布の方法としては、マイクログラビアロールを用いたマイクログラビア方法、スロットダイを用いたスロットダイ方法、ナイフエッジを用いたナイフエッジ方法等によって薄膜状に塗布するとよい。また、この場合に粘着剤として、溶剤が全く含有されていないUVインクを用いると良い。UVインクを用いる場合には、乾燥工程においてUVを照射してUVインクを固化させて粘着層3とすると良い。粘着層3の乾燥工程においては、積層状態にあるPETフィルム2、粘着層3およびPPフィルム4を徐冷する処理を施すとPPフィルム4の均一厚さの平坦性を維持するために好適である。   Specifically, the adhesive material is thinly applied to the PET film 2, and then the PP film 4 is laminated on the wet adhesive layer 3, and then the adhesive layer 3 is dried to form the PET film 2 and the PP film 4. It laminates | stacks through the adhesion layer 3 by the wet lamination method. The adhesive material may be applied in a thin film by a micro gravure method using a micro gravure roll, a slot die method using a slot die, a knife edge method using a knife edge, or the like. In this case, UV ink containing no solvent is preferably used as the adhesive. In the case where UV ink is used, the adhesive layer 3 may be formed by irradiating UV in the drying process to solidify the UV ink. In the drying process of the pressure-sensitive adhesive layer 3, it is preferable to perform a process of gradually cooling the PET film 2, the pressure-sensitive adhesive layer 3, and the PP film 4 in a laminated state in order to maintain the flatness of the uniform thickness of the PP film 4. .

本実施形態においては、PETフィルム2とPPフィルム4とを粘着層3を介して積層して耐熱性フィルム1を形成しているので、この積層体を例えば、100〜130℃に加熱した場合に、PETフィルム2と粘着層3とがPPフィルム4の変形を押さえる役目を果たしてPPフィルム4が均一厚さおよび平坦性を維持することができ、加熱時にPPフィルム4にしわが発生しない積層体を得ることができる。   In this embodiment, since the heat resistant film 1 is formed by laminating the PET film 2 and the PP film 4 with the adhesive layer 3 interposed therebetween, when this laminate is heated to, for example, 100 to 130 ° C. The PET film 2 and the pressure-sensitive adhesive layer 3 serve to suppress deformation of the PP film 4 so that the PP film 4 can maintain a uniform thickness and flatness, and a laminated body that does not generate wrinkles in the PP film 4 when heated is obtained. be able to.

<PETフィルム、ウレタン系粘着層およびPPフィルムの積層体>
(製造方法)
PETフィルムとして、帝人デュポン社製、G2、厚さ:38μmを用いた。
PPフィルムとして、ミルウィック社(MIRWEC FILM INC. 米国)製、 BOPLON(登録商標)FILM、厚さ:25μmを用いた。
ウレタン系粘着層として、トーヨーケム社製の2種類のSP−205(粘着性は中グレード)、SH−101M(粘着性は弱グレード)を用いた。
PETフィルムおよびPPフィルムのラミネート法としてドライラミネート法を用いた。
更に説明すると、ドライラミネート法においては、スロットダイ法によって前記2種類のウレタン系粘着剤についてそれぞれ乾燥厚みが10μm、15μmとなるようにPETフィルム2に塗工し、その後100℃で2分間乾燥してPETフィルム2にウレタン系粘着剤からなる粘着層3を形成した。その後ウレタン系粘着剤層にPPフィルム4のマット面側を対面させてニップ圧力0.2MPaでドライラミネートして、4種類のサンプルを作成した。
<Laminated body of PET film, urethane adhesive layer and PP film>
(Production method)
As a PET film, Teijin DuPont G2, G: thickness: 38 μm was used.
As the PP film, BOPLON (registered trademark) FILM manufactured by MIRWEC FILM INC. (USA), thickness: 25 μm was used.
Two types of SP-205 (tackiness is medium grade) and SH-101M (tackiness is weak grade) manufactured by Toyochem Co., Ltd. were used as the urethane adhesive layer.
A dry laminating method was used as a laminating method for PET film and PP film.
More specifically, in the dry laminating method, the two types of urethane adhesives are applied to the PET film 2 by the slot die method so that the dry thicknesses are 10 μm and 15 μm, respectively, and then dried at 100 ° C. for 2 minutes. Then, an adhesive layer 3 made of a urethane-based adhesive was formed on the PET film 2. Thereafter, the mat surface side of the PP film 4 was faced to the urethane-based pressure-sensitive adhesive layer and dry-laminated at a nip pressure of 0.2 MPa to prepare four types of samples.

(評価)
(1)剥離強度
4種類のサンプルの剥離強度を測定し、結果を表1に示した。これによりPPフィルム4と粘着層3との密着性と耐熱性の関係を検討した。
(2)耐熱評価
a:オーブンテスト
表1に示す測定温度に設定した循環式オーブンに曝露し、時間経過に伴う変化を観察し、結果を表1に示した。
b:通紙テスト
乾燥炉内の温度を120〜130℃とし、表1に示す通紙条件(速度・滞留時間)としてサンプルを走行させてしわの発生程度を確認して、結果を表1に示した。
(Evaluation)
(1) Peel strength The peel strengths of four types of samples were measured, and the results are shown in Table 1. Thereby, the relationship between the adhesiveness between the PP film 4 and the adhesive layer 3 and the heat resistance was examined.
(2) Heat resistance evaluation a: Oven test Exposure to a circulation oven set to the measurement temperature shown in Table 1, the change with the passage of time was observed, and the results are shown in Table 1.
b: Paper passing test The temperature in the drying furnace was set to 120 to 130 ° C., the sample was run under the paper passing conditions (speed and residence time) shown in Table 1, the degree of wrinkles was confirmed, and the results are shown in Table 1. Indicated.

Figure 2016185670
Figure 2016185670

(まとめ)
表1の結果をまとめると下記の通りとなる
a:オーブンによる耐熱評価においては、サンプル1〜4において熱収縮による剥離はなかった。
b:しわの発生については、サンプル1、2については、120℃および130℃において共にしわの発生がなかった。サンプル3、4については、120℃おいて共にしわの発生がなかったが、130℃においてPPフィルム4のPETフィルム2が積層されていない部分のカールによる端部剥離が一部に見られた。PETフィルム2が積層されている部分のPPフィルム4にはしわの発生がなかった。これにより耐熱性の優れた耐熱性フィルム1が得られたことがわかる。粘着層3の厚みに基づくしわの発生における変化は認められなかった。
c:通紙テストにおいては、細かい熱収縮模様が発生したがPPフィルム単体で発生するような折れじわは発生しておらず、滞留時間を短くすると細かい熱収縮模様の発生も緩和された。
d:PETフィルム2を厚くするとPETフィルム2が積層されていない部分のカールの大きさより小さく抑えることができることがわかった。
e:オーブンテストおよび通紙テストにおいて、PETフィルム2が積層されていない部分のPPフィルム4が熱収縮することによって著しくカールして端部剥離が発生している。従って、PETフィルム2が積層されていない部分のPPフィルム4を切断除去することにより、PPフィルム4の剥離が起きない優れた耐熱性フィルム1とすることができた。
このように本実施例の耐熱性フィルム1によれば、加熱時にPPフィルム4にしわが発生しないPPフィルム4を基礎材料とした耐熱性フィルム1を得ることができるという優れた効果を奏する。
(Summary)
The results of Table 1 are summarized as follows: a: In the heat resistance evaluation by the oven, the samples 1 to 4 did not peel due to heat shrinkage.
b: Regarding the generation of wrinkles, Samples 1 and 2 showed no wrinkles at 120 ° C and 130 ° C. Samples 3 and 4 were not wrinkled at 120 ° C., but at 130 ° C., some peeling of the edge due to curling of the portion of the PP film 4 where the PET film 2 was not laminated was observed. Wrinkles were not generated in the PP film 4 where the PET film 2 was laminated. Thereby, it turns out that the heat resistant film 1 excellent in heat resistance was obtained. No change in the generation of wrinkles based on the thickness of the adhesive layer 3 was observed.
c: In the paper-passing test, a fine heat shrinkage pattern was generated, but no creases that occurred with the PP film alone were generated, and the occurrence of the fine heat shrinkage pattern was alleviated when the residence time was shortened.
d: It was found that when the PET film 2 is thickened, it can be suppressed to be smaller than the curl size of the portion where the PET film 2 is not laminated.
e: In the oven test and the paper passing test, the PP film 4 in the portion where the PET film 2 is not laminated is thermally shrunk so that it is remarkably curled and edge peeling occurs. Therefore, by cutting and removing the PP film 4 where the PET film 2 is not laminated, it was possible to obtain an excellent heat resistant film 1 in which the PP film 4 did not peel off.
Thus, according to the heat resistant film 1 of the present example, the heat resistant film 1 based on the PP film 4 that does not generate wrinkles in the PP film 4 during heating can be obtained.

なお、本発明は前記実施形態および実施例に限定されるものではなく、必要に応じて変更することができるものである。   In addition, this invention is not limited to the said embodiment and Example, It can change as needed.

1 耐熱性フィルム
2 PETフィルム
3 粘着層
4 PPフィルム
DESCRIPTION OF SYMBOLS 1 Heat resistant film 2 PET film 3 Adhesive layer 4 PP film

Claims (3)

PETフィルムの表面に粘着層を積層し、前記粘着層の表面にPPフィルムを積層して形成されており、加熱時に前記PPフィルムにしわが発生しない積層体とされていることを特徴とする耐熱性フィルム。   It is formed by laminating a pressure-sensitive adhesive layer on the surface of a PET film and laminating a PP film on the surface of the pressure-sensitive adhesive layer, and is a laminate that does not generate wrinkles in the PP film when heated. the film. 前記PPフィルムは、ホモポリマーをインフレーション法によって2軸延伸して形成されていることを特徴とする請求項1に記載の耐熱性フィルム。   The heat resistant film according to claim 1, wherein the PP film is formed by biaxially stretching a homopolymer by an inflation method. 前記PETフィルムに対する前記PPフィルムの積層は、ドライラミネート法またはウエットラミネート法によって行われたことを特徴とする請求項1または請求項2に記載の耐熱性フィルム。   The heat-resistant film according to claim 1 or 2, wherein the PP film is laminated on the PET film by a dry lamination method or a wet lamination method.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001187872A (en) * 1999-08-06 2001-07-10 Oji Paper Co Ltd Pressure-sensitive adhesive sheet
JP2012167255A (en) * 2011-01-28 2012-09-06 San Totsukusu Kk Mold releasing film-adhered double-sided pressure-sensitive adhesive sheet, and method for producing the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001187872A (en) * 1999-08-06 2001-07-10 Oji Paper Co Ltd Pressure-sensitive adhesive sheet
JP2012167255A (en) * 2011-01-28 2012-09-06 San Totsukusu Kk Mold releasing film-adhered double-sided pressure-sensitive adhesive sheet, and method for producing the same

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