JP2010132741A - Surface-protective film - Google Patents
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- JP2010132741A JP2010132741A JP2008308244A JP2008308244A JP2010132741A JP 2010132741 A JP2010132741 A JP 2010132741A JP 2008308244 A JP2008308244 A JP 2008308244A JP 2008308244 A JP2008308244 A JP 2008308244A JP 2010132741 A JP2010132741 A JP 2010132741A
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- protective film
- vinyl acetate
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- 239000010410 layer Substances 0.000 claims abstract description 39
- 239000012790 adhesive layer Substances 0.000 claims abstract description 35
- 239000002344 surface layer Substances 0.000 claims abstract description 28
- 239000000853 adhesive Substances 0.000 claims abstract description 21
- 230000001070 adhesive effect Effects 0.000 claims abstract description 21
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 21
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 20
- -1 polybutylene terephthalate Polymers 0.000 claims abstract description 15
- 229920001707 polybutylene terephthalate Polymers 0.000 claims abstract description 14
- 229920005672 polyolefin resin Polymers 0.000 claims abstract description 12
- 230000001681 protective effect Effects 0.000 claims description 39
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 8
- 239000005977 Ethylene Substances 0.000 claims description 8
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- 229920006026 co-polymeric resin Polymers 0.000 claims description 5
- 150000002148 esters Chemical class 0.000 claims description 3
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 3
- 229920003002 synthetic resin Polymers 0.000 abstract description 24
- 239000000057 synthetic resin Substances 0.000 abstract description 21
- 230000037303 wrinkles Effects 0.000 abstract description 9
- 229920005989 resin Polymers 0.000 description 19
- 239000011347 resin Substances 0.000 description 19
- 206010040954 Skin wrinkling Diseases 0.000 description 8
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 7
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000004417 polycarbonate Substances 0.000 description 3
- 229920000515 polycarbonate Polymers 0.000 description 3
- 239000002952 polymeric resin Substances 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 238000003851 corona treatment Methods 0.000 description 2
- 229940022424 everflex Drugs 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003856 thermoforming Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007666 vacuum forming Methods 0.000 description 1
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- Laminated Bodies (AREA)
- Adhesive Tapes (AREA)
Abstract
Description
本発明は、アクリル樹脂板、ポリカーボネート樹脂板等の合成樹脂板等の表面を保護するために貼着しておく表面保護フィルムに関し、更に詳しくは、表面保護フィルムが貼着されたまま真空成形加工など加熱、延伸を伴う熱成形加工を受ける合成樹脂板等に好適な表面保護フィルムに関する。 The present invention relates to a surface protective film that is adhered to protect the surface of a synthetic resin plate such as an acrylic resin plate or a polycarbonate resin plate, and more specifically, vacuum forming while the surface protective film is adhered. It is related with the surface protection film suitable for the synthetic resin board etc. which receive the thermoforming process accompanying heating, extending | stretching etc.
アクリル樹脂板、ポリカーボネート板、塩化ビニル樹脂板等、各種合成樹脂板の表面には、使用前に傷付いたり汚れたりするのを防ぐため表面保護フィルムが貼着される。このような表面保護フィルムとしては、一般にポリエチレン、ポリプロピレン等のポリオレフィン樹脂からなるフィルムを基材層とし、その片面にエチレン・酢酸ビニル共重合体、エチレン・エチルアクリレート共重合体、エチレン・メチルメタクリレート共重合体等のエチレン共重合体からなる接着剤層を設けたものが用いられている。 A surface protective film is attached to the surface of various synthetic resin plates such as an acrylic resin plate, a polycarbonate plate, and a vinyl chloride resin plate to prevent them from being damaged or soiled before use. As such a surface protective film, a film made of a polyolefin resin such as polyethylene or polypropylene is generally used as a base layer, and an ethylene / vinyl acetate copolymer, an ethylene / ethyl acrylate copolymer, an ethylene / methyl methacrylate copolymer is formed on one surface thereof. What provided the adhesive bond layer which consists of ethylene copolymers, such as a polymer, is used.
板材製造時に各種合成樹脂板の表面に貼着された表面保護フィルムは、その板材の運搬、加工等の取り扱いを受ける際には不用意には剥がれることがないように、確実に接着されていなければならないが、最終的に不要になって剥がし取る際には簡単に剥がれることが必要である。しかしながら、近年では、真空圧空形成等、表面保護フィルムを貼着したままで板材を加熱成形することも多く、この熱により表面保護フィルムを引き剥がすのに必要な力が増加し、その傾向は温度が高いと一層加速される。従って、最初に適当な接着力のものも、後で剥がす際には強すぎるほど接着していて簡単に剥がし取ることが出来ない場合が多い。 The surface protective film adhered to the surface of various synthetic resin plates at the time of board production must be securely bonded so that it will not be inadvertently peeled off when receiving handling such as transportation and processing of the board material. However, it must be easily peeled off when it becomes unnecessary and peels off. However, in recent years, the plate material is often heat-molded while the surface protective film is adhered, such as in the formation of vacuum and compressed air. If it is high, it is further accelerated. Therefore, it is often the case that those having an appropriate adhesive strength at the beginning are too strong to be peeled off later and cannot be easily removed.
また、この表面保護フィルムは、その板材の運搬、加工等の取り扱いの際に破れたり穴が開いたりしない程度の強度が必要とされる。これに加え、近年、三次元での立体形状が主流となっており、特に意匠性を要求される部品では、複雑な形状や多色化を要求されることが多いので、これらの過酷な加工を行っても破れや皺等が発生しない程度の柔軟性や追従性も必要である。 Further, the surface protection film is required to have such strength that it is not torn or perforated during handling such as transportation and processing of the plate material. In addition, in recent years, three-dimensional solid shapes have become mainstream, especially for parts that require design, complex shapes and multiple colors are often required. There is also a need for flexibility and followability that do not cause tears or wrinkles even when performing the above.
このような問題を解決するため、ポリ４−メチルペンテン−１からなるフィルムの片面に接着剤層を設けた表面保護フィルムが提案されている（特許文献１参照）。しかしながら、ポリ４−メチルペンテン−１系重合体樹脂組成物は表面張力が小さく離型性に優れており、成形時の追従性も良好で通気孔の痕も残らないという利点を有する反面、他の樹脂との接着強度が弱いため、保護フィルムを成形された樹脂シートから剥がすときに、ポリ４−メチルペンテン−１系重合体樹脂組成物と粘着剤層とが剥離していしまい、樹脂シート側に粘着剤層が残ってしまうという問題があった。ポリ４−メチルペンテン−１系重合体樹脂組成物からなる圧着層と粘着剤層の間に接着層を介在させることによりこの問題を解決使用とする方法も提案されているが（特許文献２参照）その効果も十分とは云い難い。
本発明者らは、上記従来の欠点を解消するため研究を行った結果、表面層の樹脂としてポリブチレンテレフタレートを採用し、粘着層の樹脂として酢酸ビニル含有量が少なめのエチレン−酢酸ビニル共重合体を採用し、表面層と粘着層の間に中間層を介在させ、この中間層の樹脂として酢酸ビニル含有量が多めのエチレン−酢酸ビニル共重合体、又は接着性ポリオレフィン樹脂を採用することにより、十分な強靭性を有し、且つ柔軟性や追従性にも優れ、複雑な形状に加工しても表面層に破れや皺等が発生せず、また、表面層と中間層との接着強度も十分で剥離することがなく、更に、加熱しても保護対象の合成樹脂板と粘着層の粘着強度も必要以上に高くならず、従って、中間層と粘着層の不用意な剥離も生じず、また、保護フィルムを合成樹脂板から剥し取る際にも、合成樹脂板の表面に粘着層が残留することがないことを見い出し、本発明を完成するに至った。 As a result of researches to eliminate the above-mentioned conventional drawbacks, the present inventors have adopted polybutylene terephthalate as the resin for the surface layer and ethylene-vinyl acetate copolymer having a low vinyl acetate content as the resin for the adhesive layer. By adopting coalescence, interposing an intermediate layer between the surface layer and the adhesive layer, and using an ethylene-vinyl acetate copolymer having a higher vinyl acetate content or an adhesive polyolefin resin as the resin of the intermediate layer It has sufficient toughness, excellent flexibility and followability, and even if it is processed into a complicated shape, the surface layer does not break or wrinkle, and the adhesive strength between the surface layer and the intermediate layer In addition, even if heated, the adhesive strength between the synthetic resin plate to be protected and the adhesive layer is not higher than necessary, and therefore the intermediate layer and the adhesive layer do not inadvertently peel off. Also, attach the protective film Even when taking peeled from the resin plate, the adhesive layer on the surface of the synthetic resin plate is found that is not to remain, and have completed the present invention.
本発明は上記目的を達成するためになされたもので、本発明の請求項１に係る発明は、表面層と、粘着層と、前記表面層と粘着層の中間層とからなる表面保護フィルムであって、
前記表面層はポリブチレンテレフタレートからなり、
前記粘着層は酢酸ビニル含有量が８〜１２重量％のエチレン−酢酸ビニル共重合体からなり、
前記中間層は酢酸ビニル含有量が３０〜３５重量％のエチレン−酢酸ビニル共重合体、又は接着性ポリオレフィン樹脂からなることを特徴とする表面保護フィルムを内容とする。
This invention was made | formed in order to achieve the said objective, The invention which concerns on Claim 1 of this invention is a surface protective film which consists of a surface layer, an adhesion layer, and the intermediate | middle layer of the said surface layer and an adhesion layer. There,
The surface layer is made of polybutylene terephthalate,
The adhesive layer is made of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 8 to 12% by weight,
The intermediate layer includes a surface protective film comprising an ethylene-vinyl acetate copolymer having a vinyl acetate content of 30 to 35% by weight or an adhesive polyolefin resin.
本発明の請求項２に係る発明は、表面層の厚さが１５〜５０μｍ、粘着層の厚さが１０〜２０μｍ、中間層の厚さが１０〜２０μｍであることを特徴とする請求項１記載の表面保護フィルムを内容とする。 The invention according to claim 2 of the present invention is characterized in that the thickness of the surface layer is 15 to 50 μm, the thickness of the adhesive layer is 10 to 20 μm, and the thickness of the intermediate layer is 10 to 20 μm. The content is the surface protective film described.
本発明の請求項３に係る発明は、接着性ポリオレフィン樹脂が、エチレンとアクリル酸もしくはアクリル酸のエステルとの共重合体樹脂、又はエチレンと無水マイン酸との共重合体樹脂であることを特徴とする請求項１又は２記載の表面保護フィルムを内容とする。 The invention according to claim 3 of the present invention is characterized in that the adhesive polyolefin resin is a copolymer resin of ethylene and acrylic acid or an ester of acrylic acid, or a copolymer resin of ethylene and maleic anhydride. The content of the surface protective film according to claim 1.
本発明の表面保護フィルムは、表面層がポリブチレンテレフタレートからなるため、耐熱性及び強靱性に優れているので合成樹脂板の表面を十分に保護でき、また、柔軟性や追従性に優れているので皺や破れも生じない。また、樹脂との接着性にも優れているため、本発明の表面保護フィルムを剥がす際にも、中間層は酢酸ビニル含有量が３０〜３５重量％のエチレン−酢酸ビニル共重合体、又は接着性ポリオレフィン樹脂からなるので、表面層及び粘着層の両方に強く接着しており、これらが剥離するのを防止し、保護フィルムを合成樹脂板から剥ぎ取る際においても、粘着層が合成樹脂板に残留するのを防止することができる。さらに、粘着層は酢酸ビニル含有量が８〜１２重量％のエチレン−酢酸ビニル共重合体からなるため、加熱成形した場合でも粘着強度は過度に強くならず、加熱成形後であっても、成形後の合成樹脂板から容易に剥がすことができる。 Since the surface layer of the present invention is made of polybutylene terephthalate, the surface protective film is excellent in heat resistance and toughness, so it can sufficiently protect the surface of the synthetic resin plate, and is excellent in flexibility and followability. So there are no traps or tears. Moreover, since it is excellent also in adhesiveness with resin, when peeling off the surface protection film of the present invention, the intermediate layer has an ethylene-vinyl acetate copolymer having a vinyl acetate content of 30 to 35% by weight or an adhesive. Because it is made of an adhesive polyolefin resin, it adheres strongly to both the surface layer and the adhesive layer, preventing them from peeling off, and even when the protective film is peeled off from the synthetic resin plate, the adhesive layer is attached to the synthetic resin plate. It can be prevented from remaining. Furthermore, since the adhesive layer is made of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 8 to 12% by weight, the adhesive strength does not become excessively strong even when heat-molded. It can be easily removed from the later synthetic resin plate.
本発明の表面保護フィルムは、表面層と、粘着層と、前記表面層と粘着層の中間層とからなる表面保護フィルムであって、
前記表面層はポリブチレンテレフタレートからなり、
前記粘着層は酢酸ビニル含有量が８〜１２重量％のエチレン−酢酸ビニル共重合体からなり、
前記中間層は酢酸ビニル含有量が３０〜３５重量％のエチレン−酢酸ビニル共重合体、又は接着性ポリオレフィン樹脂からなることを特徴とする。
The surface protective film of the present invention is a surface protective film comprising a surface layer, an adhesive layer, and an intermediate layer between the surface layer and the adhesive layer,
The surface layer is made of polybutylene terephthalate,
The adhesive layer is made of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 8 to 12% by weight,
The intermediate layer is made of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 30 to 35% by weight or an adhesive polyolefin resin.
本発明においては、耐熱性、強靱性、柔軟性、追従性、他の樹脂との接着性を考慮し、表面層としてポリブチレンテレフタレートが使用され、その厚さは１５〜５０μｍである。このようなポリブチレンテレフタレートの市販品としては、例えば、オージーフィルム株式会社製のホモＰＢＴ等が挙げられる。厚さが１５μｍ未満であると、強度が不十分となり合成樹脂板の表面を十分保護できない。また、５０μｍを超えると柔軟性、追従性が不十分となり加熱成形の際に合成樹脂板の変形に表面層が追従できなくなって、複雑な形状に加工をすると皺が生じたり、破断する恐れがある。 In the present invention, in consideration of heat resistance, toughness, flexibility, followability, and adhesion to other resins, polybutylene terephthalate is used as the surface layer, and the thickness thereof is 15 to 50 μm. Examples of such commercially available products of polybutylene terephthalate include Homo PBT manufactured by OG Film Co., Ltd. If the thickness is less than 15 μm, the strength is insufficient and the surface of the synthetic resin plate cannot be sufficiently protected. Also, if it exceeds 50 μm, the flexibility and followability become insufficient, and the surface layer cannot follow the deformation of the synthetic resin plate at the time of thermoforming, and if it is processed into a complicated shape, wrinkles may occur or it may break. is there.
本発明において、粘着層は合成樹脂板に粘着し、当該表面保護フィルムの剥落を防ぐためのものであり、酢酸ビニル含有量が８〜１２重量％のエチレン−酢酸ビニル共重合体からなり、その厚さは１０〜２０μｍである。このようなエチレン−酢酸ビニル共重合体の市販品としては、例えば、三井・デュポンポリケミカル株式会社製のエバフレックス（登録商標）Ｐ１００７等が挙げられる。
酢酸ビニルの含有量が８重量％より少ない場合は粘着強度が弱すぎて当該表面保護フィルムが合成樹脂板から剥落して保護の役割を果たさない恐れがあり、１２重量％よりも多い場合は加熱ＡＢＳ成形した際に粘着強度が強くなりすぎ、合成樹脂板から剥がしにくくなり、粘着層が中間層から分離して合成樹脂に残留する恐れがある。
粘着層の厚さが２０μｍを超えると、表面保護フィルム全体の柔軟性、追従性が低下し、皺が生じたり破断する恐れが増大する。また、厚さが１０μｍより薄くするのは困難でコストが高くなる一方、１０μｍより薄くしても当該表面保護フィルムの柔軟性、追従性はさほど改善されない。
In the present invention, the pressure-sensitive adhesive layer adheres to the synthetic resin plate to prevent the surface protective film from peeling off, and is made of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 8 to 12% by weight. The thickness is 10-20 μm. Examples of such commercially available ethylene-vinyl acetate copolymer include Everflex (registered trademark) P1007 manufactured by Mitsui DuPont Polychemical Co., Ltd.
If the vinyl acetate content is less than 8% by weight, the adhesive strength is too weak and the surface protective film may peel off from the synthetic resin plate and may not play a protective role. When the ABS molding is performed, the adhesive strength becomes too strong and it is difficult to peel off from the synthetic resin plate, and the adhesive layer may be separated from the intermediate layer and remain on the synthetic resin.
When the thickness of the pressure-sensitive adhesive layer exceeds 20 μm, the flexibility and followability of the entire surface protective film are lowered, and the risk of wrinkles or breakage increases. Further, it is difficult to make the thickness thinner than 10 μm and the cost is increased. On the other hand, even if the thickness is thinner than 10 μm, the flexibility and followability of the surface protective film are not improved so much.
本発明において、中間層は粘着層と表面層の両方に接着し、表面層と粘着層の剥離を防ぐためのものであり、特に、保護フィルムを合成樹脂板から剥がし取る際において、粘着層を合成樹脂板に残留させることのないように粘着層と十分に接着している必要がある。このような中間層は、酢酸ビニル含有量が３０〜３５重量％のエチレン−酢酸ビニル共重合体、又は、エチレンと、アクリル酸もしくはアクリル酸のエステルとの共重合体樹脂、エチレンと無水マレイン酸との共重合体樹脂等の接着性ポリオレフィン樹脂からなり、その厚さは１０〜２０μｍである。このようなエチレン−酢酸ビニル共重合体の市販品としては、例えば、三井・デュポンポリケミカル株式会社製のエバフレックス（登録商標）Ｖ５２３等が挙げられ、また、接着性ポリオレフィン樹脂の市販品としては、例えば、三井化学株式会社製のアドマー（登録商標）ＳＥ８００等が挙げられる。
エチレン−酢酸ビニル共重合体の酢酸ビニルの含有量が３０重量％より少ないと表面層との接着強度が弱すぎて剥離する恐れがあり、３５重量％よりも多いと中間層の強度が弱くなり、この部分で裂けて表面層と粘着層が剥離する恐れがある。
中間層の厚さが２０μｍを超えると、表面保護フィルム全体の柔軟性、追従性が低下し、皺が生じたり破断する恐れが増大する。また、厚さが１０μｍより薄くするのは困難でコストが高くなる一方、１０μｍより薄くしても当該表面保護フィルムの柔軟性、追従性はさほど改善されない。
In the present invention, the intermediate layer adheres to both the pressure-sensitive adhesive layer and the surface layer, and prevents peeling of the surface layer and the pressure-sensitive adhesive layer. In particular, when the protective film is peeled off from the synthetic resin plate, The adhesive layer needs to be sufficiently adhered so as not to remain on the synthetic resin plate. Such an intermediate layer is composed of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 30 to 35% by weight, or a copolymer resin of ethylene and acrylic acid or an ester of acrylic acid, ethylene and maleic anhydride. And a thickness of 10 to 20 μm. Examples of such commercially available ethylene-vinyl acetate copolymers include Everflex (registered trademark) V523 manufactured by Mitsui DuPont Polychemical Co., Ltd., and commercially available adhesive polyolefin resins. Examples include Admer (registered trademark) SE800 manufactured by Mitsui Chemicals, Inc.
If the vinyl acetate content of the ethylene-vinyl acetate copolymer is less than 30% by weight, the adhesive strength with the surface layer may be too weak and may peel off. If it exceeds 35% by weight, the strength of the intermediate layer becomes weak. The surface layer and the adhesive layer may be peeled off at this portion.
When the thickness of the intermediate layer exceeds 20 μm, the flexibility and followability of the entire surface protective film are lowered, and the risk of wrinkles or breakage increases. Further, it is difficult to make the thickness thinner than 10 μm and the cost is increased. On the other hand, even if the thickness is thinner than 10 μm, the flexibility and followability of the surface protective film are not improved so much.
本発明の表面保護フィルムは、例えば、中間層樹脂と粘着層樹脂とを共押出し、ポリブチレンテレフタレートフィルムにラミネートすることにより好適に製造される。ポリブチレンフィルムには予めコロナ処理等を施して、中間層との接着性を高めておくことが好ましい。 The surface protective film of the present invention is preferably produced by, for example, co-extrusion of an intermediate layer resin and an adhesive layer resin and laminating it on a polybutylene terephthalate film. The polybutylene film is preferably subjected to corona treatment or the like in advance to enhance the adhesion with the intermediate layer.
以下、本発明の実施例を挙げて具体的に説明するが、本発明はこれらの実施例のみに限定されるものではない。 EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples.
（表面保護フィルムの製造）
実施例１
表面層として、市販のポリブチレンテレフタレートフィルム（オージーフィルム（株）製、商品名；ホモＰＢＴ（厚さ２５μｍ））を用いた。
粘着層を構成する樹脂としてはエチレン−酢酸ビニル共重合体樹脂（三井・デュポンポリケミカル（株）製、商品名；エバフレックス（登録商標）Ｐ１００７、酢酸ビニル含有量；１０％、密度；９３０ｋｇ／ｍ2 ）を用いるとともに、中間層を構成する樹脂としてはエチレン−酢酸ビニル共重合体樹脂（三井・デュポンポリケミカル（株）製、商品名；エバフレックス（登録商標）Ｖ５２３、酢酸ビニル含有量；３３％、密度；９６０ｋｇ／ｍ2 ）を用いた。
共押出しラミネート機（Ｔダイ出口温度２２０℃）により粘着層樹脂及び中間層樹脂を共押出しして、この２層からなるフィルムを予めコロナ処理を施した上記ポリブチレンテレフタレートフィルムのコロナ処理面へラミネート接着させて、本発明の表面保護フィルムとした。
得られた表面保護フィルムの厚さは、表面層２５μｍ、中間層１５μｍ、粘着層１５μｍであり、総厚さが５５μｍであった。
(Manufacture of surface protection film)
Example 1
As the surface layer, a commercially available polybutylene terephthalate film (manufactured by OG Film Co., Ltd., trade name: Homo PBT (thickness 25 μm)) was used.
As the resin constituting the adhesive layer, an ethylene-vinyl acetate copolymer resin (Mitsui DuPont Polychemical Co., Ltd., trade name: Evaflex (registered trademark) P1007, vinyl acetate content: 10%, density: 930 kg / m 2 ), and as a resin constituting the intermediate layer, an ethylene-vinyl acetate copolymer resin (manufactured by Mitsui DuPont Polychemical Co., Ltd., trade name; Evaflex (registered trademark) V523, vinyl acetate content; 33%, density; 960 kg / m 2 ) was used.
The co-extrusion laminating machine (T-die outlet temperature 220 ° C.) is used to co-extrude the adhesive layer resin and the intermediate layer resin, and the two-layer film is laminated to the corona-treated surface of the polybutylene terephthalate film previously subjected to corona treatment. It was made to adhere and it was set as the surface protection film of this invention.
The surface protective film thus obtained had a surface layer of 25 μm, an intermediate layer of 15 μm, and an adhesive layer of 15 μm, and a total thickness of 55 μm.
実施例２
中間層樹脂として、市販の接着性ポリオレフィン樹脂（三井化学（株）製、商品名；アドマー（登録商標）ＳＥ８００、密度９００ｋｇ／ｍ2 ）を使用したほかは実施例１と同様にして本発明の表面保護フィルムを製造した。
得られた表面保護フィルムの厚さは、表面層２５μｍ、中間層１５μｍ、粘着層１５μｍであり、総厚さが５５μｍであった。
Example 2
As the intermediate layer resin, a commercially available adhesive polyolefin resin (manufactured by Mitsui Chemicals, Inc., trade name: Admer (registered trademark) SE800, density 900 kg / m 2 ) was used in the same manner as in Example 1 to obtain the present invention. A surface protective film was produced.
The surface protective film thus obtained had a surface layer of 25 μm, an intermediate layer of 15 μm, and an adhesive layer of 15 μm, and a total thickness of 55 μm.
評価
実施例１、実施例２で得られた表面保護フィルムの粘着層を厚さ５００μｍのポリカーボネートシートに、加熱ロール貼合せ装置（温度１５０℃）を用いて貼着した。これを、圧空成形機（加熱温度１８０℃）を用い、ポリカーボネートシート側を真空側にして加熱成形を行った。出来上がった成形品を観察し、表面保護フィルムの破れ、皺の有無を目視観察した。また、この成形品から表面保護フィルムを剥がし、成形品への粘着層の残留の有無を目視観察した。
観察の結果、実施例１、実施例２の双方とも表面保護フィルムに破れ、皺が見当たらず、また、このフィルムを成形品から剥がし取った際にも粘着層の成形品への残留は見られなかった。
Evaluation The adhesive layer of the surface protective film obtained in Example 1 and Example 2 was attached to a polycarbonate sheet having a thickness of 500 μm using a heating roll laminating apparatus (temperature 150 ° C.). This was subjected to heat molding using a pressure forming machine (heating temperature 180 ° C.) with the polycarbonate sheet side set to the vacuum side. The finished molded product was observed, and the surface protective film was torn and the presence or absence of wrinkles was visually observed. Further, the surface protective film was peeled off from the molded product, and the presence or absence of the adhesive layer remaining on the molded product was visually observed.
As a result of observation, both Example 1 and Example 2 were broken by the surface protective film, no wrinkles were found, and even when this film was peeled off from the molded product, the adhesive layer remained in the molded product. There wasn't.
叙上のとおり、本発明の表面保護フィルムは、表面層がポリブチレンテレフタレートからなり、粘着層が酢酸ビニル含有量が少なめのエチレン−酢酸ビニル共重合体からなり、中間層が酢酸ビニル含有量が多めのエチレン−酢酸ビニル共重合体、又は接着性ポリオレフィン樹脂からなることにより、この表面保護フィルムを貼着したまま合成樹脂板等を加熱成形しても破れや皺などがなく、また表面保護フィルムを剥がし取った場合でも粘着層が成形品に残らないので、加熱成形前の合成樹脂板等の表面を保護する表面保護フィルムとして有用である。 As described above, in the surface protective film of the present invention, the surface layer is made of polybutylene terephthalate, the adhesive layer is made of an ethylene-vinyl acetate copolymer with a small vinyl acetate content, and the intermediate layer has a vinyl acetate content. By comprising a large amount of ethylene-vinyl acetate copolymer or adhesive polyolefin resin, there is no tear or wrinkle even if the synthetic resin plate or the like is thermoformed while the surface protective film is adhered, and the surface protective film Even when the film is peeled off, the adhesive layer does not remain in the molded product, so that it is useful as a surface protective film for protecting the surface of a synthetic resin plate or the like before heat molding.
Claims (3)
前記表面層はポリブチレンテレフタレートからなり、
前記粘着層は酢酸ビニル含有量が８〜１２重量％のエチレン−酢酸ビニル共重合体からなり、
前記中間層は酢酸ビニル含有量が３０〜３５重量％のエチレン−酢酸ビニル共重合体、又は接着性ポリオレフィン樹脂からなることを特徴とする表面保護フィルム。 A surface protective film comprising a surface layer, an adhesive layer, and an intermediate layer of the surface layer and the adhesive layer,
The surface layer is made of polybutylene terephthalate,
The adhesive layer is made of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 8 to 12% by weight,
The intermediate layer is made of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 30 to 35% by weight or an adhesive polyolefin resin.
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| JP2015004003A (en) * | 2013-06-21 | 2015-01-08 | 日東電工株式会社 | Adhesive sheet |
| WO2019022208A1 (en) * | 2017-07-28 | 2019-01-31 | リンテック株式会社 | Protection film laminate and functional film |
| JP2020177090A (en) * | 2019-04-16 | 2020-10-29 | リンテック株式会社 | Protective film laminate for retardation film |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2013189486A (en) * | 2012-03-12 | 2013-09-26 | Nitto Denko Corp | Pressure-sensitive adhesive sheet |
| JP2015004003A (en) * | 2013-06-21 | 2015-01-08 | 日東電工株式会社 | Adhesive sheet |
| WO2019022208A1 (en) * | 2017-07-28 | 2019-01-31 | リンテック株式会社 | Protection film laminate and functional film |
| CN110891783A (en) * | 2017-07-28 | 2020-03-17 | 琳得科株式会社 | Protective film laminate and functional film |
| KR20200035912A (en) * | 2017-07-28 | 2020-04-06 | 린텍 가부시키가이샤 | Protective film laminate and functional film |
| JPWO2019022208A1 (en) * | 2017-07-28 | 2020-05-28 | リンテック株式会社 | Protect film laminate and functional film |
| TWI782064B (en) * | 2017-07-28 | 2022-11-01 | 日商琳得科股份有限公司 | Protective film laminate and functional film |
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| JP2020177090A (en) * | 2019-04-16 | 2020-10-29 | リンテック株式会社 | Protective film laminate for retardation film |
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