JP2008063474A - Base material film for surface protection film - Google Patents
Base material film for surface protection film Download PDFInfo
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- JP2008063474A JP2008063474A JP2006243787A JP2006243787A JP2008063474A JP 2008063474 A JP2008063474 A JP 2008063474A JP 2006243787 A JP2006243787 A JP 2006243787A JP 2006243787 A JP2006243787 A JP 2006243787A JP 2008063474 A JP2008063474 A JP 2008063474A
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- surface protective
- base material
- surface protection
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- 239000000463 material Substances 0.000 title abstract description 11
- 230000003746 surface roughness Effects 0.000 claims abstract description 11
- 230000001681 protective effect Effects 0.000 claims description 45
- 239000000758 substrate Substances 0.000 claims description 14
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 13
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 13
- 229920005989 resin Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 229920001684 low density polyethylene Polymers 0.000 claims description 8
- 239000004702 low-density polyethylene Substances 0.000 claims description 8
- 229920013716 polyethylene resin Polymers 0.000 claims description 8
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 abstract description 10
- 230000001070 adhesive effect Effects 0.000 abstract description 10
- 230000000903 blocking effect Effects 0.000 abstract description 9
- 238000004804 winding Methods 0.000 abstract description 9
- 239000010410 layer Substances 0.000 description 11
- 229920005992 thermoplastic resin Polymers 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 206010052428 Wound Diseases 0.000 description 5
- 208000027418 Wounds and injury Diseases 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 206010002329 Aneurysm Diseases 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012792 core layer Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 229920005680 ethylene-methyl methacrylate copolymer Polymers 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920005606 polypropylene copolymer Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Landscapes
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Laminated Bodies (AREA)
- Adhesive Tapes (AREA)
Abstract
Description
本発明は、各種基材の表面に仮着し、塵の付着や傷付き等がないように、その表面を保護するために使用する表面保護フィルム用の基材フィルムに関する。 The present invention relates to a base film for a surface protective film that is temporarily attached to the surface of various base materials and used to protect the surface so that there is no dust adhesion or scratches.
ステンレス板、アルミ板、その他金属板、樹脂塗装板、樹脂板、化粧板の表面や、最近ではパソコン、ワープロ、電卓等の液晶ディスプレイ等の製品およびその部材、例えば偏光板、導光板、前面板等の表面に表面保護フィルムを貼着し、製造、搬送、保管等の際に表面の損傷やゴミやほこり等が付着して汚染されるのを防止することが行われている。そして、この表面保護フィルムは使用後に剥離され、廃棄される。 Surfaces of stainless steel plates, aluminum plates, other metal plates, resin-coated plates, resin plates, decorative plates, and recently products such as liquid crystal displays such as personal computers, word processors, calculators, etc., such as polarizing plates, light guide plates, front plates A surface protective film is stuck on the surface of the material to prevent the surface from being damaged or contaminated with dirt, dust or the like during manufacture, transportation, storage or the like. And this surface protection film peels after use and is discarded.
この表面保護フィルムには、表面保護の機能の他に、寸法安定性、ロール状に巻かれている表面保護フィルムを巻き戻して使用する際にブロッキングを生じない巻き戻し性等が要求されており、例えば、特許文献１には、低密度ポリエチレンを主成分とし、表面粗さ（Ｒａ）が０．０８〜２．００μｍである基材層と粘着層からなる巻き戻し性に優れた表面保護フィルムが、特許文献２には、Ｔダイから溶融押出されたポリエチレン溶融膜を、表面の粗さが十点平均粗さ（Ｒｚ）で０．５μｍ以下である鏡面冷却ロールと表面がゴムである押し付けロールとで挟むことで片面が平滑面、もう一方の面を磨りガラス状とすることにより巻き取り、積み重ねの際のブロッキングが防止された表面保護フィルムが得られることが提案されている。 In addition to the function of surface protection, the surface protection film is required to have dimensional stability, rewinding property that does not cause blocking when the surface protection film wound in a roll shape is used after being rewound. For example, Patent Document 1 discloses a surface protective film excellent in unwinding properties comprising a base material layer having a low-density polyethylene as a main component and a surface roughness (Ra) of 0.08 to 2.00 μm and an adhesive layer. However, in Patent Document 2, a polyethylene molten film melt-extruded from a T-die is pressed against a mirror surface cooling roll having a 10-point average roughness (Rz) of 0.5 μm or less and a rubber surface. It has been proposed that a surface protective film can be obtained by sandwiching between rolls so that one side is smooth and the other side is polished and made glassy to prevent blocking during stacking.
一方、表面保護フィルムに用いる基材フィルムにおいても、製膜したフィルムをロール状に巻き取る際にフィルム間に入った空気によって、いわゆる巻き瘤の発生や、フィルム同士がブロッキングするのを防止する目的でフィルムの表面を粗面化することが行われている。 On the other hand, also in the base film used for the surface protection film, the purpose of preventing the so-called entanglement and blocking between the films due to the air that enters between the films when the formed film is wound up in a roll shape The surface of the film is roughened.
ところが、表面が粗面化されたフィルムは透明性が悪く、特許文献１、２に記載の表面保護フィルムを貼着したままでは製品の欠陥や、異物の存在が検出できないという問題があり、透明性の優れた表面保護フィルムの提供が求められていた。 However, the film whose surface is roughened has poor transparency, and there is a problem that defects in the product and the presence of foreign matter cannot be detected while the surface protective film described in Patent Documents 1 and 2 is stuck. There has been a demand for providing a surface protective film having excellent properties.
本発明は、巻き取り時に巻き瘤の発生やフィルム同士のブロッキングが起こらない、表面保護フィルム用の基材フィルムであって、しかも透明性の優れた表面保護フィルムを得ることができる基材フィルムを提供することを目的とする。 The present invention is a substrate film for a surface protection film that does not cause winding or blocking between films during winding, and is a substrate film that can obtain a surface protection film having excellent transparency. The purpose is to provide.
即ち、本発明によれば、
（１）表面保護フィルム用基材フィルムであって、該基材フィルムの一方の表面は平滑面であり、他方の粘着剤が塗布される表面（反対面）はＪＩＳ-Ｂ０６０１による表面粗さ（Ｒａ）が０．２〜２．０μｍであることを特徴とする表面保護フィルム用基材フィルム。
（２）表面保護フィルム用基材フィルムがポリエチレン系樹脂フィルムであることを特徴とする（１）記載の表面保護フィルム用基材フィルム。
（３）表面保護フィルム用基材フィルムがポリエチレン系樹脂からなる３層フィルムであることを特徴とする（２）記載の表面保護フィルム用基材フィルム。
（４）ポリエチレン系樹脂が直鎖状低密度ポリエチレン又は低密度ポリエチレン系樹脂であることを特徴とする（２）又は（３）記載の表面保護フィルム用基材フィルム、が提供される。
That is, according to the present invention,
(1) A substrate film for a surface protective film, wherein one surface of the substrate film is a smooth surface, and the surface to which the other adhesive is applied (opposite surface) is a surface roughness according to JIS-B0601 ( Ra) is 0.2-2.0 micrometers, The base film for surface protection films characterized by the above-mentioned.
(2) The substrate film for a surface protective film according to (1), wherein the substrate film for a surface protective film is a polyethylene resin film.
(3) The substrate film for a surface protective film according to (2), wherein the substrate film for a surface protective film is a three-layer film made of a polyethylene resin.
(4) The base film for a surface protective film according to (2) or (3), wherein the polyethylene resin is a linear low density polyethylene or a low density polyethylene resin.
本発明の表面保護フィルムは一方の表面が平滑面であり、他方の表面が粗面化されているのでロール状に巻き取る際にフィルム間に入った空気をスムーズに排出することができ巻き瘤（巻き瘤ができるとフィルムのその部分が伸ばされ、その部分が垂れ、厚みムラの原因になるという問題が生じる。）ができるのが防止されると同時にフィルム同士がブロッキングするのも防止される。しかも、本発明においては、粗面化された面に接着剤（粘着剤）を塗布するので、粗面部分が接着剤（粘着剤）に覆われることで粗面化による光の散乱が防止され、透明な表面保護フィルムとすることができるのという利点を有している。 Since the surface protective film of the present invention has one surface that is smooth and the other surface is roughened, the air that has entered between the films can be discharged smoothly when wound into a roll shape. (When a bulge is formed, the part of the film is stretched and the part sags, causing a problem of uneven thickness.) At the same time, the film is prevented from blocking. . Moreover, in the present invention, since the adhesive (pressure-sensitive adhesive) is applied to the roughened surface, the rough surface portion is covered with the adhesive (pressure-sensitive adhesive), thereby preventing light scattering due to the roughening. It has the advantage that it can be set as a transparent surface protection film.
以下、本発明の表面保護フィルム用基材フィルムを具体的に説明する。
まず、本発明の表面保護フィルム用基材フィルムは、両面が平滑な通常の透明フィルムや、両面を粗面化した、いわゆる両面エンボスフィルムとは異なり、一方の表面が平滑面であり、その反対面のＪＩＳ−Ｂ０６０１による表面粗さ（Ｒａ）が０．２〜２．０μｍ、好ましくは０．２〜１．０μｍである。
この、前記反対面のＪＩＳ−Ｂ０６０１による表面粗さ（Ｒａ）が０．２μｍ未満ではロール状に巻き取る際にスムーズに空気を排出することができないので本発明の目的である巻き瘤の防止ができないのみならず、巻き戻し時のブロッキング防止効果も期待できないので好ましくなく、Ｒａが２．０μｍを超えると巻き瘤やブロッキングの防止には効果的であるが粘着剤の均一な塗布が困難となるので好ましくない。
なお、本発明において平滑面というのは、通常の透明フィルムの表面状態と同等の状態であり、例えば、ＪＩＳ−Ｂ０６０１による表面粗さ（Ｒａ）で示した場合、Ｒａが０．２μｍ未満、通常は、Ｒａが０．１μｍ前後かそれ以下のものを意味している。
Hereinafter, the base film for a surface protective film of the present invention will be specifically described.
First, the base film for a surface protective film of the present invention is different from a normal transparent film having smooth both surfaces and a so-called double-sided embossed film having both surfaces roughened, and one surface is a smooth surface, and vice versa. The surface roughness (Ra) according to JIS-B0601 of the surface is 0.2 to 2.0 μm, preferably 0.2 to 1.0 μm.
If the surface roughness (Ra) according to JIS-B0601 of the opposite surface is less than 0.2 μm, air cannot be smoothly discharged when wound up in a roll shape, so that the prevention of curling which is the object of the present invention is prevented. This is not preferable because it cannot be expected to prevent blocking at the time of rewinding. Ra exceeding 2.0 μm is effective in preventing winding and blocking, but it is difficult to uniformly apply an adhesive. Therefore, it is not preferable.
In addition, in this invention, a smooth surface is a state equivalent to the surface state of a normal transparent film, for example, when shown by the surface roughness (Ra) by JIS-B0601, Ra is less than 0.2 micrometer and is normal. Means that Ra is about 0.1 μm or less.
上述した特性を有する表面保護フィルム用基材フィルムの製造方法としては、例えば、（イ）熱可塑性樹脂を押出成形後に鏡面冷却ロールと表面がゴムである押し付けロールで挟む特許文献２に記載の方法が挙げられるが、その他に、密度の異なる２種の原料樹脂を使用した場合に、密度差により溶融押出後冷却固化時の結晶化速度が異なるので、冷却固化時に自然に凹凸が形成されるという粗面化の技術（特許文献１に記載の方法）や、広い分子量分布を有する熱可塑性樹脂を用いた場合にダイリップにおける抵抗の差異が生じ表面が粗面化するという技術を応用して、一方の面に相当する層には通常の熱可塑性樹脂を使用し、（ロ）反対面に相当する層には密度の異なる２種の原料樹脂や、（ハ）広い分子量分布を有する熱可塑性樹脂を使用して共押出する方法でも製造することができる。 As a method for producing a base film for a surface protective film having the above-described characteristics, for example, (a) a method described in Patent Document 2 in which a thermoplastic resin is sandwiched between a mirror cooling roll and a pressing roll whose surface is rubber after extrusion molding In addition, when two types of raw material resins having different densities are used, the crystallization speed at the time of cooling and solidification after melt extrusion differs depending on the density difference, so that irregularities are naturally formed at the time of cooling and solidification. Applying a roughening technique (the method described in Patent Document 1) or a technique in which when a thermoplastic resin having a wide molecular weight distribution is used, a difference in resistance occurs in the die lip and the surface is roughened. A normal thermoplastic resin is used for the layer corresponding to this surface, and (b) two raw material resins having different densities and (c) a thermoplastic resin having a wide molecular weight distribution are used for the layer corresponding to the opposite surface. It can also be produced by a method of co-extrusion with use.
本発明の基材フィルムに使用する熱可塑性樹脂としては、例えば、低密度ポリエチレン、直鎖状低密度ポリエチレン、高密度ポリエチレン、エチレン−酢酸ビニル共重合体、エチレン−メタクリル酸メチル共重合体等のポリエチレン系樹脂、ポリプレンの単独重合体やプロピレンと他のα−オレフィンとの共重合体等のポリプロピレン系樹脂、或いはナイロン、ポリエステル、ポリスチレンなどを単独で、或いは２種以上を混合して使用することができるが、柔軟性、追随性などの点からポリエチレン系樹脂が好ましく、特に透明性（この場合フィルム内部における光の散乱が少ない樹脂、いわゆる内部ヘイズの小さい樹脂を意味している。）の点で低密度ポリエチレン、直鎖状低密度ポリエチレン、更には、低密度ポリエチレンに比べて耐熱性に優れている直鎖状低密度ポリエチレンを主に使用するのが好ましい。
なお、粗面の形成を（イ）の機械的方法によらず、（ロ）、（ハ）に記載の原料樹脂を選択することで達成する場合は、上記熱可塑性樹脂を適宜混合したり、或いは粗面を形成しやすいグレードを選択使用すればよい。更に、本発明においては、必要に応じて滑剤、アンチブロッキング剤、熱安定剤、酸化防止剤、その他の添加剤を配合することができる。しかしながら、これらの添加剤は、基材フィルム自身の透明性を損なわない範囲にするのが好ましい。
Examples of the thermoplastic resin used for the base film of the present invention include low-density polyethylene, linear low-density polyethylene, high-density polyethylene, ethylene-vinyl acetate copolymer, and ethylene-methyl methacrylate copolymer. Use polypropylene resin such as polyethylene resin, polyprene homopolymer, copolymer of propylene and other α-olefin, or nylon, polyester, polystyrene, etc. alone or in admixture of two or more. However, a polyethylene resin is preferable from the viewpoint of flexibility, followability, and the like, and in particular, transparency (in this case, a resin with less light scattering inside the film, meaning a resin with a small internal haze) is meant. Low-density polyethylene, linear low-density polyethylene, and resistance to low-density polyethylene. Preferably predominantly use linear low density polyethylene has excellent sex.
In addition, when the formation of the rough surface is achieved by selecting the raw material resin described in (b) and (c) regardless of the mechanical method of (a), the thermoplastic resin is appropriately mixed, Alternatively, a grade that easily forms a rough surface may be selected and used. Furthermore, in the present invention, a lubricant, an antiblocking agent, a heat stabilizer, an antioxidant, and other additives can be blended as necessary. However, these additives are preferably in a range that does not impair the transparency of the base film itself.
本発明の表面保護フィルム用基材フィルムのフィルム構成としては、上述したように単層或いは二層若しくは三層の多層構造とすることが可能であるが、製造の簡便さや、各種機能の付与を考慮した場合、多層構造にするのが好ましく、特に、カールの発生を防止する上で三層構造とするのが好ましい。好ましい構成としては直鎖状的密度ポリエチレン［ＬＬＤＰＥ（粗面）］／ＬＬＤＰＥ／ＬＬＤＰＥ（平滑面）、ＬＬＤＰＥ／ＬＬＤＰＥ／低密度ポリエチレン［ＬＤＰＥ（平滑面）］が挙げられる。
また、本発明の表面保護フィルム用基材フィルムの厚みは２０〜１００μｍ、好ましくは３０〜６０μｍである。本発明においては、省資源化、低コスト化の観点からできるだけ厚みが薄いことが望ましく、その場合はＬＬＤＰＥを使用するのが好ましい。
As described above, the film structure of the base film for a surface protective film of the present invention can be a single layer or a multilayer structure of two layers or three layers. However, it is easy to manufacture and impart various functions. In consideration of this, a multilayer structure is preferable, and a three-layer structure is particularly preferable for preventing the occurrence of curling. Preferred configurations include linear density polyethylene [LLDPE (rough surface)] / LLDPE / LLDPE (smooth surface) and LLDPE / LLDPE / low density polyethylene [LDPE (smooth surface)].
Moreover, the thickness of the base film for a surface protective film of the present invention is 20 to 100 μm, preferably 30 to 60 μm. In the present invention, it is desirable that the thickness is as thin as possible from the viewpoint of resource saving and cost reduction. In that case, it is preferable to use LLDPE.
そして、本発明の表面保護フィルム用基材フィルムは、ロール状に巻き取られて保管され、その後、粗面側に粘着剤を塗布することによって表面保護フィルムとすることができる。 And the base film for surface protection films of this invention is wound up and stored in roll shape, and can be made into a surface protection film by apply | coating an adhesive to the rough surface side after that.
本発明で使用した熱可塑性樹脂は
・ＬＬＤＰＥ−１
マット調の表面が得られるグレードの直鎖状低密度ポリエチレン（密度９２７ｋｇ／ｍ３、ＭＩ＝２．０ｇ／１０分、製造者：プライムポリマー（株）、商品名：ＥＶＯＬＵＥ ＳＰ２７２０）
・ＬＬＤＰＥ−２
直鎖状低密度ポリエチレン（密度９２７ｋｇ／ｍ３、ＭＩ＝２．０ｇ／１０分）である。
また、得られた表面保護フィルム用基材フィルムの性質は以下の方法で評価した。
＜ヘイズ＞
ＪＩＳ Ｋ７１３６に準拠して測定した。
＜表面粗度＞
ＪＩＳ Ｂ０６０１に準拠して測定した。
＜巻き瘤の発生＞
実際に製品４０００ｍをロール状に巻き取って巻き瘤の発生の有無を目視で評価した。
○：発生なし、×：発生
＜透明性＞
得られた表面保護フィルム用基材フィルムの粗面側、両面が粗面の場合はどちらか一方、両面が平滑面の場合は、いずれかの平滑面に粘着剤を塗布して表面保護フィルムを得、該表面保護フィルムの粘着剤塗布面側を試験片（アクリル板）の表面に貼着して、表面保護フィルム側から試験片表面がクリアーに見えた場合は○、良く見えない場合は×とした。
The thermoplastic resin used in the present invention is LLDPE-1.
Grade linear low density polyethylene (density 927kg / m3, MI = 2.0g / 10min, manufacturer: Prime Polymer Co., Ltd., trade name: EVOLUE SP2720) that provides a matte surface
・ LLDPE-2
It is a linear low density polyethylene (density 927 kg / m3, MI = 2.0 g / 10 min).
Moreover, the property of the obtained base film for surface protection films was evaluated with the following method.
<Haze>
The measurement was made according to JIS K7136.
<Surface roughness>
It measured based on JIS B0601.
<Generation of aneurysm>
Actually, 4000 m of the product was wound up in a roll shape, and the presence or absence of the occurrence of an aneurysm was visually evaluated.
○: Not generated, ×: Generated <Transparency>
If the rough surface side of the obtained base film for a surface protective film, both surfaces are rough surfaces, if both surfaces are smooth surfaces, apply a pressure-sensitive adhesive to any smooth surface to apply the surface protective film. The surface of the surface protective film is coated with the adhesive-coated surface side on the surface of the test piece (acrylic plate), and when the surface of the test piece is clearly visible from the surface protective film side, it is X. It was.
実施例１
外層にＬＬＤＰＥ−１、芯層及びもう一方の外層にＬＬＤＰＥ−２を供給して三台の押出機からなる多層インフレーション成形機を用いてＬＬＤＰＥ−１／ＬＬＤＰＥ−２／ＬＬＤＰＥ−２からなる三層構成で、厚み構成比が１０／２０／１０（μｍ）、全体厚みが４０μｍであって、ＬＬＤＰＥ−２を配した面が平滑面、ＬＬＤＰＥ−１を配した面が粗面である本発明にかかる表面保護フィルム用基材フィルムを得た。得られたフィルムのヘイズ、表面粗度、巻き瘤の発生、及び粘着剤を塗布して表面保護フィルムとして使用した際の透明性を表１に示す。
Example 1
Three layers consisting of LLDPE-1 / LLDPE-2 / LLDPE-2 using a multi-layer inflation molding machine consisting of three extruders by supplying LLDPE-1 to the outer layer, core layer and LLDPE-2 to the other outer layer In the present invention, the thickness ratio is 10/20/10 (μm), the overall thickness is 40 μm, the surface on which LLDPE-2 is arranged is a smooth surface, and the surface on which LLDPE-1 is arranged is a rough surface. Such a base film for a surface protective film was obtained. Table 1 shows the haze, surface roughness, the occurrence of wrapping, and the transparency of the obtained film when applied as a surface protective film by applying an adhesive.
比較例１
ＬＬＤＰＥ−１からなる両面が粗面である単層で全体厚さが４０μｍの表面保護フィルム用基材フィルムを得た。得られたフィルムのヘイズ、表面粗度、巻き瘤の発生、及び粘着剤を塗布して表面保護フィルムとして使用した際の透明性を同じく表１に示す。
Comparative Example 1
A base film for a surface protective film having a total thickness of 40 [mu] m was obtained with a single layer made of LLDPE-1 having both rough surfaces. Table 1 also shows the haze, surface roughness, generation of wrappings, and transparency when applied as a surface protective film by applying an adhesive.
比較例２
ＬＬＤＰＥ−２からなる両面が平滑面である単層で全体厚さが４０μｍの表面保護フィルム用基材フィルムを得た。得られたフィルムのヘイズ、表面粗度、巻き瘤の発生、及び粘着剤を塗布して表面保護フィルムとして使用した際の透明性を同じく表１に示す。
Comparative Example 2
A base film for a surface protective film having a total thickness of 40 μm was obtained as a single layer made of LLDPE-2 and having smooth surfaces on both sides. Table 1 also shows the haze, surface roughness, generation of wrappings, and transparency when applied as a surface protective film by applying an adhesive.
表１から明らかなように本発明にかかる表面保護フィルム用基材フィルムは巻き取り時に巻き瘤が発生することなく巻き取り可能であるばかりでなく、巻き戻し時にもブロッキングすることなく巻き戻しができ、また表面保護フィルムとして使用した場合に、試験片の表面状態がクリアーに見えるので光学用途など欠点検査の必要がある材料の表面保護フィルムとしても好適なものであった。一方、両面が粗面の比較例１の表面保護フィルム用基材フィルムは巻き取り、巻き戻しは容易であったが、表面保護フィルムとして使用した場合に、試験片の表面状態を見ることができず光学用途など欠点検査の必要がある材料の表面保護フィルムとしては使用できないものであった。更に、両面が平滑面である比較例２の表面保護フィルム用基材フィルムは巻き取り時に巻き瘤が発生したため、精巧な材料の表面保護フィルムとしては使用できないものであった。 As is clear from Table 1, the substrate film for a surface protective film according to the present invention can be rewound without generating a winding knob at the time of winding, and can be rewound without blocking at the time of rewinding. In addition, when used as a surface protective film, the surface state of the test piece appears to be clear, so that it was also suitable as a surface protective film for materials that require defect inspection such as optical applications. On the other hand, the base film for a surface protective film of Comparative Example 1 having both rough surfaces was easy to wind and unwind, but when used as a surface protective film, the surface state of the test piece can be seen. Therefore, it could not be used as a surface protective film for materials that require defect inspection such as optical applications. Furthermore, the base film for a surface protective film of Comparative Example 2 whose both surfaces were smooth surfaces could not be used as a surface protective film made of an elaborate material because of the occurrence of winding wounds during winding.
本発明の表面保護フィルム用基材フィルムは、ステンレス板、アルミ板、その他金属板、樹脂塗装板、樹脂板、化粧板の表面や、パソコン、ワープロ、電卓等の液晶ディスプレイ等の製品およびその部材、例えば偏光板、導光板、前面板等の表面に貼着し、製造、搬送、保管等の際に表面の損傷やゴミやほこり等が付着して汚染されるのを防止するための表面保護フィルムに好適に使用することができる。特に、表面保護フィルムを貼着したままで製品の欠陥や、異物の存在を検出する必要がある用途に適している。 The base film for a surface protective film of the present invention is a stainless plate, aluminum plate, other metal plate, resin-coated plate, resin plate, decorative plate surface, products such as personal computers, word processors, calculators and other liquid crystal displays, and members thereof. For example, it is attached to the surface of a polarizing plate, a light guide plate, a front plate, etc., and surface protection to prevent the surface from being damaged or contaminated with dirt or dust during manufacture, transportation, storage, etc. It can be suitably used for a film. In particular, it is suitable for applications in which it is necessary to detect product defects and the presence of foreign substances with the surface protective film adhered.
Claims (4)
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| JP2006243787A JP4745927B2 (en) | 2006-09-08 | 2006-09-08 | Base film for surface protection film |
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| JP2006243787A JP4745927B2 (en) | 2006-09-08 | 2006-09-08 | Base film for surface protection film |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010042665A (en) * | 2008-07-15 | 2010-02-25 | San Totsukusu Kk | Base film |
| JP2011116809A (en) * | 2009-12-01 | 2011-06-16 | Nitto Denko Corp | Surface protection sheet |
| JP2011190370A (en) * | 2010-03-15 | 2011-09-29 | Sekisui Chem Co Ltd | Surface protective film |
| CN102879853A (en) * | 2011-07-11 | 2013-01-16 | 住友化学株式会社 | Light guide plate raw sheet with mask membranes |
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| JPS62201985A (en) * | 1985-11-13 | 1987-09-05 | Nitto Electric Ind Co Ltd | Adhesive film or sheet for surface protection |
| JPH05229082A (en) * | 1992-02-25 | 1993-09-07 | Toray Gosei Film Kk | Surface protective film |
| JPH071681A (en) * | 1993-06-15 | 1995-01-06 | Mitsui Toatsu Chem Inc | Surface protective adhesive film |
| JPH08259914A (en) * | 1995-03-22 | 1996-10-08 | Sekisui Chem Co Ltd | Surface protective film |
| JP2002338911A (en) * | 2001-05-21 | 2002-11-27 | Nitto Denko Corp | Protective sheet for processing semiconductor wafer |
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| JPS57190064A (en) * | 1981-05-19 | 1982-11-22 | Toray Ind Inc | Adhesive tape |
| JPS62201985A (en) * | 1985-11-13 | 1987-09-05 | Nitto Electric Ind Co Ltd | Adhesive film or sheet for surface protection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2010042665A (en) * | 2008-07-15 | 2010-02-25 | San Totsukusu Kk | Base film |
| JP2011116809A (en) * | 2009-12-01 | 2011-06-16 | Nitto Denko Corp | Surface protection sheet |
| JP2011190370A (en) * | 2010-03-15 | 2011-09-29 | Sekisui Chem Co Ltd | Surface protective film |
| CN102879853A (en) * | 2011-07-11 | 2013-01-16 | 住友化学株式会社 | Light guide plate raw sheet with mask membranes |
| JP2013020810A (en) * | 2011-07-11 | 2013-01-31 | Sumitomo Chemical Co Ltd | Masking film laminating original plate for light guide plate |
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| JP4745927B2 (en) | 2011-08-10 |
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