JPH05229080A - Surface protective film - Google Patents
Surface protective filmInfo
- Publication number
- JPH05229080A JPH05229080A JP4073229A JP7322992A JPH05229080A JP H05229080 A JPH05229080 A JP H05229080A JP 4073229 A JP4073229 A JP 4073229A JP 7322992 A JP7322992 A JP 7322992A JP H05229080 A JPH05229080 A JP H05229080A
- Authority
- JP
- Japan
- Prior art keywords
- density polyethylene
- adhesive layer
- adhesiveness
- polyethylene
- self
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、樹脂板、金属板等の表
面に仮着させて使用する表面保護フイルムに関し、とく
に基材材質をポリエチレンとする表面保護フイルムに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface protective film which is used by temporarily adhering it to the surface of a resin plate, a metal plate or the like, and more particularly to a surface protective film whose base material is polyethylene.
【０００２】[0002]
【従来の技術】表面保護フイルムは、樹脂板、金属板等
（以下樹脂板等という。）の表面に、適度な接着力をも
って仮着され、通常、樹脂板等を印刷、乾燥、加熱加工
する間も、さらに断裁加工時にも粘着されたままで使用
され、樹脂板等を最終的に使用する段階で剥がされる。
したがって表面保護フイルムには、樹脂板等の傷付き防
止のための表面保護の他に、樹脂板等の表面との間に気
泡が入らないようにする良好な密着性、仮着のための適
度な粘着力、高温熱処理に対しても粘着力が高くなりす
ぎずかつ最終的に表面保護フイルムを剥がした場合にも
板表面に残存フイルム成分による汚れが生じないだけの
耐熱性、断裁加工しても切れ残り等が生じない良好な断
裁性、等の特性が要求される。2. Description of the Related Art A surface protective film is temporarily adhered to the surface of a resin plate, a metal plate or the like (hereinafter referred to as a resin plate or the like) with an appropriate adhesive force, and usually, the resin plate or the like is printed, dried and heated. It is used while being adhered during the cutting process and during the cutting process, and is peeled off when the resin plate or the like is finally used.
Therefore, in addition to surface protection to prevent scratches on the resin plate, the surface protection film has good adhesion to prevent air bubbles from entering the surface of the resin plate, etc. Adhesive strength, heat resistance that does not become too high even with high temperature heat treatment, and does not cause stains on the plate surface due to residual film components even when the surface protective film is finally peeled off. Good cuttability and other characteristics that do not cause uncut residue are required.
【０００３】従来から、ポリエチレンを基材とする表面
保護フイルムは、各種知られている。たとえば、特開昭
５９−１００１５１号公報には、低密度ポリエチレンと
直鎖状低密度ポリエチレンからなる単層のフイルムで、
直鎖状低密度ポリエチレンで粘着力を付与したものが、
特開昭６０−２４３１４２号公報には、２種の直鎖状低
密度ポリエチレンと低密度ポリエチレンからなる単層の
フイルムで、直鎖状低密度ポリエチレンにより強度およ
び粘着力の改善をねらったものが、特開昭６０−２４５
５４９号公報には、低密度ポリエチレンと直鎖状低密度
ポリエチレンからなり、これらを変成させることにより
被保護面への添加剤の残留防止等をねらった感熱タイプ
の表面保護フイルムが、それぞれ開示されている。ま
た、エチレン−酢酸ビニル共重合体を主成分とし、これ
に低分子量ポリエチレンを混和して粘着層を形成した表
面保護フイルムも知られている（実開平１−７４２４９
号公報）。Conventionally, various surface protective films based on polyethylene have been known. For example, JP-A-59-100151 discloses a single-layer film composed of low-density polyethylene and linear low-density polyethylene.
The linear low density polyethylene with adhesive strength
Japanese Unexamined Patent Publication (Kokai) No. 60-243142 discloses a single-layer film composed of two kinds of linear low-density polyethylene and low-density polyethylene, which is intended to improve strength and adhesive strength by the linear low-density polyethylene. JP-A-60-245
Japanese Patent No. 549 discloses heat-sensitive type surface protective films each composed of low-density polyethylene and linear low-density polyethylene, which are modified to prevent the additive from remaining on the surface to be protected. ing. There is also known a surface protective film comprising an ethylene-vinyl acetate copolymer as a main component and a low-molecular-weight polyethylene mixed therein to form an adhesive layer (Actual Kaihei 1-74249).
Publication).
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記の
ような従来の表面保護フイルムでは、前述した要求特性
の全てを満足させることは難しい。すなわち、直鎖状低
密度ポリエチレンを用いたものは、粘着性、密着性は良
好であるが、断裁性が不十分であり、断裁加工時にフイ
ルムの切れ残りが生じる。単に低密度ポリエチレンのみ
からなる表面保護フイルムの場合には、耐熱性、断裁性
は良好であるが、粘着性、密着性に劣り、十分な仮着性
能、表面保護が得られにくい。エチレン−酢酸ビニル共
重合体を主成分とするものは、耐熱性に劣り、高温処理
されると剥離困難になる。However, it is difficult for the above-mentioned conventional surface protection film to satisfy all the above-mentioned required characteristics. That is, the one using the linear low-density polyethylene has good adhesiveness and adhesiveness, but has insufficient cutting property, and the film is left uncut during the cutting process. In the case of a surface protective film made of only low density polyethylene, the heat resistance and the cutting property are good, but the adhesiveness and the adhesiveness are poor, and it is difficult to obtain sufficient temporary adhesion performance and surface protection. Those containing an ethylene-vinyl acetate copolymer as a main component are inferior in heat resistance and are difficult to peel off when subjected to a high temperature treatment.
【０００５】本発明は、ポリエチレンを基材層としその
上に粘着層を積層した積層タイプの表面保護フイルムに
関し、該粘着層に要求される前述の、適度な粘着力、良
好な密着性、耐熱性、断裁性等を全て満足する表面保護
フイルムを提供することを目的とする。The present invention relates to a laminate type surface protective film comprising polyethylene as a base material layer and an adhesive layer laminated thereon, and has the above-mentioned appropriate adhesive strength, good adhesion and heat resistance required for the adhesive layer. The purpose of the present invention is to provide a surface protection film which satisfies all the requirements of cutting property and cutting property.
【０００６】[0006]
【課題を解決するための手段】この目的に沿う本発明の
表面保護フイルムは、ポリエチレンからなる基材層の片
面に、密度０．９１ｇ／ｃｍ3 ないし０．９３ｇ／ｃｍ
3 の低密度ポリエチレンを５０重量％以上含み表面粗さ
が中心線平均粗さＲａにて０．０５μｍ以下である粘着
層を積層したものからなる。A surface protective film of the present invention for this purpose has a density of 0.91 g / cm 3 to 0.93 g / cm on one side of a base material layer made of polyethylene.
It is composed by laminating an adhesive layer containing 50% by weight or more of low-density polyethylene 3 and having a surface roughness of 0.05 μm or less in terms of centerline average roughness Ra.
【０００７】本発明の表面保護フイルムは、基材層と、
被保護体の表面に接着される粘着層との積層構成を有す
る。基材層は、ポリエチレンからなるが、このポリエチ
レンの種類は特に限定されない。しかし、表面保護フイ
ルムとして高い機械的特性をもたせるためには高密度ポ
リエチレンが好ましく、機械的特性とともに粘着層との
親和性をもたせておくには、高密度ポリエチレンと低密
度ポリエチレンとの混合体が特に好ましい。また、高密
度ポリエチレン、低密度ポリエチレンは、元々高い耐熱
性および良好な断裁性をもっているので、これらの材質
を選択することにより、表面保護フイルム全体としての
耐熱性、耐熱性が高く保たれる。The surface protective film of the present invention comprises a substrate layer and
It has a laminated structure with an adhesive layer adhered to the surface of the protected object. The base material layer is made of polyethylene, but the type of polyethylene is not particularly limited. However, high-density polyethylene is preferable in order to have high mechanical properties as the surface protection film, and in order to have mechanical properties and affinity with the adhesive layer, a mixture of high-density polyethylene and low-density polyethylene is preferable. Particularly preferred. Further, since high-density polyethylene and low-density polyethylene originally have high heat resistance and good cutting property, the heat resistance and heat resistance of the surface protection film as a whole can be kept high by selecting these materials.
【０００８】本発明の表面保護フイルムにおいては、粘
着層が、被保護体表面への粘着性、密着性に寄与する
が、本発明の目的を達成するために、この粘着層が、同
時に高い耐熱性、良好な断裁性を備える必要がある。そ
こで本発明においては、粘着層の主成分（５０ないし１
００重量％）を、元々耐熱性、断裁性の良好な低密度ポ
リエチレンとし、この低密度ポリエチレンからなるフイ
ルムの表面形状を特定することにより、粘着性、密着性
を大幅に改善し、目標とする特性を全て満足させるよう
にした。特定した表面粗さを達成するための要素は、ポ
リマー本来の構造やフイルムを成形する時の条件などで
ある。ポリマーの好ましい状態を示す一例としてスウェ
ル比がある。In the surface protective film of the present invention, the adhesive layer contributes to the adhesiveness and adhesiveness to the surface of the article to be protected, but in order to achieve the object of the present invention, this adhesive layer simultaneously has high heat resistance. It is necessary to have good cutting property and good cutting property. Therefore, in the present invention, the main component of the adhesive layer (50 to 1
(00% by weight) is originally low-density polyethylene having good heat resistance and cutting properties, and by specifying the surface shape of the film made of this low-density polyethylene, the adhesiveness and adhesion are significantly improved, and the target is set. I tried to satisfy all the characteristics. Factors for achieving the specified surface roughness include the original structure of the polymer and the conditions for forming the film. The swell ratio is an example of a preferable state of the polymer.
【０００９】スウェル比とは、正確な定義は後述する
が、溶融ポリマーがノズル（口金）から吐出される際の
ふくらみの程度のことで、溶融ポリマーの吐出の際の流
れ易さの指標となる。スウェル比が大きいと、溶融ポリ
マーは流れにくく、ノズルからの吐出時のふくらみの程
度が大きく、スウェル比が小さいと溶融ポリマーは流れ
易く吐出時のふくらみの程度は小さい。したがって、ス
ウェル比が大きいと、溶融ポリマー吐出時にノズル吐出
口の縁によって吐出シートの表面が粗れ易く、逆にスウ
ェル比が小さいと、吐出シートの表面粗れが小さく抑え
られ、製品フイルムにしても表面が平滑になる。本発明
者らは、密度０．９１ｇ／ｃｍ3 ないし０．９３ｇ／ｃ
ｍ3 の低密度ポリエチレンフイルムであっても、その表
面を平滑にすると、密着性が大幅に向上することを見出
した。本発明では、これを表面保護フイルムの粘着層に
適用し、低密度ポリエチレンを主成分とする粘着層のス
ウェル比を１．５以下とすることにより、粘着層の表面
を平滑にでき、その密着性を大幅に向上することができ
る。Although the precise definition of the swell ratio will be described later, it is the degree of swelling when the molten polymer is discharged from a nozzle (base), and is an index of the ease of flow of the molten polymer when it is discharged. .. When the swell ratio is large, the molten polymer does not flow easily, and the degree of bulging when discharged from the nozzle is large, and when the swell ratio is small, the molten polymer easily flows and the degree of bulging during discharging is small. Therefore, if the swell ratio is large, the surface of the discharge sheet tends to be rough due to the edge of the nozzle discharge port when the molten polymer is discharged, and conversely, if the swell ratio is small, the surface roughness of the discharge sheet is suppressed to a small level, and the product film is made. Also has a smooth surface. We have found that the density is 0.91 g / cm 3 to 0.93 g / c.
It has been found that even with a low-density polyethylene film of m 3 , if the surface is smoothed, the adhesiveness is significantly improved. In the present invention, by applying this to the pressure-sensitive adhesive layer of the surface protection film and setting the swell ratio of the pressure-sensitive adhesive layer containing low-density polyethylene as the main component to 1.5 or less, the surface of the pressure-sensitive adhesive layer can be made smooth and its adhesion can be improved. It is possible to significantly improve the sex.
【００１０】また、スウェル比を１．５以下に抑えるに
は、低密度ポリエチレンの溶融押出温度を、通常の温度
よりは高くする必要があるが、溶融押出温度を高くする
と、上述の流れ性改善に加え、ポリマーの熱分解が促進
される。そして、熱分解により、低分子量ポリマーが増
加する。この低分子量ポリマーは、粘着性向上に寄与
し、熱処理等により漸次表面層に移行する。したがっ
て、スウェル比を１．５以下に抑えることは、上述の表
面平滑化による密着性向上に加え、高温押出を伴うこと
により、低分子量ポリマー増加による粘着性向上に寄与
することになる。つまり、表面平滑化と低分子量ポリマ
ー増加が同時に行われることになるので、低密度ポリエ
チレンであっても、粘着層の密着性と粘着性の両方が大
幅に向上される。Further, in order to suppress the swell ratio to 1.5 or less, the melt extrusion temperature of the low density polyethylene needs to be higher than the normal temperature. However, if the melt extrusion temperature is increased, the above-mentioned flowability is improved. In addition, thermal decomposition of the polymer is accelerated. And the low molecular weight polymer is increased by the thermal decomposition. This low molecular weight polymer contributes to the improvement of tackiness and gradually shifts to the surface layer by heat treatment or the like. Therefore, suppressing the swell ratio to 1.5 or less contributes to the improvement of the adhesiveness due to the surface smoothing described above, and also contributes to the improvement of the tackiness due to the increase of the low-molecular weight polymer due to the high temperature extrusion. That is, since the surface smoothing and the increase of the low molecular weight polymer are performed at the same time, both the adhesiveness and the adhesiveness of the adhesive layer are significantly improved even with low density polyethylene.
【００１１】上記密着性に寄与する粘着層表面の平滑度
は、中心線平均表面粗さＲａで０．０５μｍ以下、最大
粗さＲｔで０．３μｍ以下とすることが好ましい。The smoothness of the surface of the pressure-sensitive adhesive layer, which contributes to the adhesion, is preferably 0.05 μm or less in the center line average surface roughness Ra and 0.3 μm or less in the maximum roughness Rt.
【００１２】また、低密度ポリエチレンは、熱分解で架
橋する性質があり、架橋が進みすぎると、粘着性、密着
性を悪化させる。上記低スウェル比を実現するためには
高温溶融押出が必要であるが、熱分解による架橋が過度
にならないよう、かつ熱分解による低分子量ポリマーの
増加を達成できるよう、低密度ポリエチレンの材料特性
に応じて適切な温度範囲を選択することが必要である。
より高温条件において架橋を抑えるには、高温押出用安
定剤を添加することが有効である。ただし、低分子量ポ
リマーを増加させるための熱分解を促進する必要もある
ので、添加量は適正量に制限する必要がある。またポリ
マーの冷却固化時に、粘着性、密着性を悪化させないよ
う、急冷する等して結晶化を抑える必要がある。Further, low density polyethylene has a property of being cross-linked by thermal decomposition, and if cross-linking proceeds too much, tackiness and adhesion are deteriorated. To achieve the above low swell ratio, high temperature melt extrusion is necessary, but in order to prevent excessive crosslinking due to thermal decomposition and to achieve an increase in low molecular weight polymer due to thermal decomposition, the material properties of low density polyethylene have to be improved. Therefore, it is necessary to select an appropriate temperature range.
In order to suppress crosslinking under higher temperature conditions, it is effective to add a stabilizer for high temperature extrusion. However, it is necessary to accelerate the thermal decomposition for increasing the amount of the low molecular weight polymer, so that the addition amount needs to be limited to an appropriate amount. Further, when the polymer is solidified by cooling, it is necessary to quench the crystallization so as not to deteriorate the adhesiveness and the adhesiveness, thereby suppressing the crystallization.
【００１３】本発明の表面保護フイルムにおいては、粘
着層の基材層への積層方法は特に限定しないが、上述の
スウェル比、高温溶融押出温度を達成するために、さら
には良好な製膜性を得るために共押出によることが望ま
しい。積層は、ノズル（口金）内で行っても、上流側の
ポリマー管やフィルター装置で行ってもよい。In the surface protective film of the present invention, the method for laminating the adhesive layer on the base material layer is not particularly limited, but in order to achieve the above-mentioned swell ratio and high temperature melt extrusion temperature, further excellent film forming property is obtained. Co-extrusion is preferred to obtain Lamination may be performed in the nozzle (base) or in the upstream polymer tube or filter device.
【００１４】粘着層は、元々耐熱性、断裁性の良好な低
密度ポリエチレンを主成分とし、低密度ポリエチレンを
５０重量％以上含むが、粘着性、密着性をさらに向上す
るために、直鎖状低密度ポリエチレンを５０重量％未満
含有させてもよい。直鎖状低密度ポリエチレン含有によ
り、上記スウェル比を実現すると共に、高温溶融押出に
よる低密度ポリエチレン自身の改善された粘着性、密着
性に、直鎖状低密度ポリエチレン自身が元々有する優れ
た粘着性、密着性を加えることができ、粘着層として、
粘着性、密着性、耐熱性、断裁性の全てを一層容易に満
足させることができる。直鎖状低密度ポリエチレンの密
度は、０．９３ｇ／ｃｍ3 より高くなると粘着性、密着
性が悪化するので、０．９３ｇ／ｃｍ3 以下が好まし
い。The pressure-sensitive adhesive layer is mainly composed of low-density polyethylene, which is originally excellent in heat resistance and cutting property, and contains 50% by weight or more of low-density polyethylene. However, in order to further improve the pressure-sensitive adhesiveness and the adhesiveness, the linear layer is used. The low density polyethylene may be contained in an amount of less than 50% by weight. Realization of the above swell ratio by the inclusion of linear low-density polyethylene, and improved adhesiveness and adhesion of low-density polyethylene itself by high temperature melt extrusion, and excellent adhesiveness that linear low-density polyethylene itself has originally Adhesiveness can be added, as an adhesive layer,
It is possible to more easily satisfy all of tackiness, adhesion, heat resistance, and cutting property. When the density of the linear low-density polyethylene is higher than 0.93 g / cm 3 , the tackiness and adhesion are deteriorated, so 0.93 g / cm 3 or less is preferable.
【００１５】粘着層を構成する低密度ポリエチレンと直
鎖状低密度ポリエチレンの粘度は、特に限定されない
が、メルトインデックスにて、共に１ないし１５の範囲
内にあることが好ましい。The viscosities of the low-density polyethylene and the linear low-density polyethylene which form the adhesive layer are not particularly limited, but it is preferable that both are in the range of 1 to 15 in terms of melt index.
【００１６】また、粘着層の粘着性をさらに向上させる
ために、粘着層に０．１ないし１０重量％の粘着性付与
剤を添加してもよい。粘着性付与剤としては、たとえ
ば、ロジン系樹脂、テルペン系樹脂、石油系樹脂、オレ
フィンゴム系樹脂、スチレン−イソプレン−スチレン共
重合樹脂、スチレン−ブタジエン−スチレン共重合樹脂
が挙げられる。Further, in order to further improve the adhesiveness of the adhesive layer, 0.1 to 10% by weight of a tackifier may be added to the adhesive layer. Examples of the tackifier include rosin resin, terpene resin, petroleum resin, olefin rubber resin, styrene-isoprene-styrene copolymer resin, and styrene-butadiene-styrene copolymer resin.
【００１７】〔特性の測定方法および効果の評価方法〕
本発明における特性の測定方法および効果の評価方法は
次の通りである。 （１）スウェル比 ノズルから溶融ポリマーを吐出させた時のノズル径に対
する吐出物の径（冷却後に測定）の比をスウェル比と定
義する。後述の実施例、比較例における表においては、
これをＳＲと略称する。スウェル比の測定は、メルトイ
ンデクサーでメルトインデックスを測定する方法で溶融
ポリマーをノズルから吐出させ、冷却固化後の吐出物の
径をノギスで測定し、予め判っているノズル径に対する
吐出物の径の比を算出する。[Method of measuring characteristics and method of evaluating effects]
The method of measuring characteristics and the method of evaluating effects in the present invention are as follows. (1) Swell ratio The ratio of the diameter of the discharged material (measured after cooling) to the diameter of the nozzle when the molten polymer is discharged from the nozzle is defined as the swell ratio. In the tables of Examples and Comparative Examples described later,
This is abbreviated as SR. The swell ratio is measured by discharging the molten polymer from the nozzle by the method of measuring the melt index with a melt indexer, measuring the diameter of the discharged material after cooling and solidifying with a caliper, and measuring the diameter of the discharged material with respect to the nozzle diameter known in advance. Calculate the ratio of
【００１８】（２）粘着力、密着性、表面粗さ、板汚
れ、耐熱性、断裁性 板厚０．５ｍｍの筒中プラスチック製ポリカーボネー
ト板（以下ＰＣ板と呼ぶ。ここでは幅５０ｍｍ、長さ１
５０ｍｍに裁断したもの）に、試料フイルムをゴムロー
ル（３ｋｇ荷重／５０ｍｍ幅）でごみ、皺の入らないよ
うに貼り付けた後、２３℃の恒温室に２４時間放置し、
以下の測定を行う。(2) Adhesiveness, Adhesion, Surface Roughness, Plate Staining, Heat Resistance, Cutting Property Polycarbonate plate made of plastic in a cylinder with a plate thickness of 0.5 mm (hereinafter referred to as PC plate, here width 50 mm, length 1)
After being cut into 50 mm), the sample film was dusted with a rubber roll (3 kg load / 50 mm width) and adhered without wrinkles, and then left in a thermostatic chamber at 23 ° C. for 24 hours,
Perform the following measurements.
【００１９】試料の熱処理；試料フイルムをＰＣ板に
貼り付け上記の要領で準備したサンプルを、７０℃、１
２０℃のそれぞれの温度条件で１時間熱処理し、粘着力
と板汚れの評価に使う。Heat treatment of sample: Sample film prepared by adhering the sample film to a PC plate at 70 ° C. and 1
Heat treatment is performed for 1 hour under each temperature condition of 20 ° C., and used for evaluation of adhesive strength and plate stain.
【００２０】粘着力の評価；ＰＣ板に貼り付け上記の
要領で準備したサンプルにおいて、ＰＣ板に対する試料
フイルムの粘着力を、テンシロン（引張り速度３００ｍ
ｍ／ｍｉｎ、１８０°剥離）を用いて測定する。（単位
はｇ／５０ｍｍ幅）Evaluation of Adhesiveness: The adhesiveness of the sample film to the PC plate in the sample prepared by adhering to the PC plate as described above was measured by Tensilon (pulling speed: 300 m).
m / min, 180 ° peeling). (Unit is g / 50mm width)
【００２１】密着性の評価；貼込み面間に入っている
微小気泡について、のサンプルを目視で外観検査す
る。（判定；◎・・・気泡無し、○・・・気泡少い、△
・・・気泡少し有るが実用可、×・・・気泡多くて実用
不可）Evaluation of adhesion: The sample is visually inspected with respect to the micro bubbles existing between the sticking surfaces. (Judgment: ◎ ... No bubbles, ○ ... Small bubbles, △
・ ・ ・ There are a few bubbles, but practical use is possible ×: Many bubbles are not practical
【００２２】表面粗さは、粘着面について（株）小坂
研究所製の三次元表面粗さ計で測定長さ１ｍｍを横方向
に１０ｍｍ間隔で１０本測定して平均し、中心線平均粗
さ（Ｒａ）を求めた（単位はμｍ）。The surface roughness of the adhesive surface was measured by a three-dimensional surface roughness meter manufactured by Kosaka Laboratory Ltd., and the average length was measured by averaging by measuring 10 lengthwise 1 mm at 10 mm intervals. (Ra) was calculated (unit: μm).
【００２３】板汚れの評価；上記の要領で準備し
たサンプルにおいて、試料フイルムを剥がしてＰＣ板表
面の汚れ状態を暗室内でスポット光を当てて観察する。
（判定；◎・・・汚れ皆無、○・・・汚れ殆ど無し、△
・・・汚れ少しあるが実用上問題なし、×・・・汚れ有
り）Evaluation of plate stain: In the sample prepared as described above, the sample film is peeled off and the stain condition of the PC plate surface is observed by shining spot light in a dark room.
(Judgment: ◎ ... no stain, ○ ... almost no stain, △
・ ・ ・ Slightly dirty, but practically no problem, × ・ ・ ・ Dirty)
【００２４】耐熱性の評価；上記に於ける熱処理温
度１２０℃と２３℃の粘着力の差で表す（単位はｇ）。
（判定；０〜１０ｇ・・・良好、１１〜５０ｇ・・・実
用上問題有り、５１ｇ以上・・・不可）Evaluation of heat resistance: Expressed by the difference in adhesive strength between the heat treatment temperatures of 120 ° C. and 23 ° C. (unit: g).
(Judgment: 0-10g ... Good, 11-50g ... Practical problems, 51g or more ... Improper)
【００２５】断裁性の評価；試料フイルム貼付面を下
にして上記のサンプルを共同精機工作所製ギロチン断
裁機でカットし、試料フイルムの切れ残り状態を評価す
る。（判定；◎・・・断裁性優秀、○・・・切れ残り無
し、△・・・切れ残り少し、×・・・切れ残り有り）Evaluation of cutting property: The above sample is cut with a guillotine cutting machine manufactured by Kyodo Seiki Kogyo Co., Ltd. with the sample film-attached surface facing down, and the uncut state of the sample film is evaluated. (Judgment: ◎ ... Excellent cutting performance, ○ ... No cuts left, △ ... Slight cuts left, × ...
【００２６】[0026]
実施例１〜９、比較例１０〜１７ 密度０．９１８ｇ／ｃｍ3 の低密度ポリエチレン樹脂
（メルトインデックス（ＭＩ）＝７．０）４０部と密度
０．９６１ｇ／ｃｍ3 の高密度ポリエチレン樹脂（ＭＩ
＝８．０）６０部をタンブラーにてブレンドし基材層の
原料とした。また、実施例２の場合、密度０．９２５ｇ
／ｃｍ3 の低密度ポリエチレン樹脂（ＭＩ＝５．０）８
０部と直鎖状低密度ポリエチレン樹脂（ＭＩ＝２．０、
密度０．９２０ｇ／ｃｍ3 ）２０部をブレンドし、接着
層の原料とした。なお、直鎖状低密度ポリエチレン樹脂
（ＬＬＤＰＥ）は、いずれの場合も上記と同じものを用
いた。Examples 1-9, Comparative Examples 10-17 40 parts of low-density polyethylene resin having a density of 0.918 g / cm 3 (melt index (MI) = 7.0) and high-density polyethylene resin having a density of 0.961 g / cm 3 ( MI
= 8.0) 60 parts were blended with a tumbler to prepare a raw material for the base material layer. In the case of Example 2, the density is 0.925 g
/ Cm 3 low density polyethylene resin (MI = 5.0) 8
0 parts and linear low density polyethylene resin (MI = 2.0,
20 parts of a density of 0.920 g / cm 3 ) was blended and used as a raw material for the adhesive layer. The linear low-density polyethylene resin (LLDPE) used in each case was the same as above.
【００２７】基材層、粘着層の原料をそれぞれ直径４０
ｍｍの押出機（設定温度１８０℃）、直径３５ｍｍの押
出機（設定温度２４０℃）で同一のＴダイ（設定温度２
００℃）から共押出して、厚さ６０μｍのフイルムを得
た。この時、厚み比率は、基材層６０％、粘着層４０％
とした。なお、キャスト条件としては、エアナイフで３
０℃の冷却ロールに押し付けて成形した。The raw materials for the base material layer and the adhesive layer are each 40 mm in diameter.
mm extruder (set temperature 180 ° C), diameter 35mm extruder (set temperature 240 ° C) with the same T-die (set temperature 2)
(00 ° C.) to obtain a film having a thickness of 60 μm. At this time, the thickness ratio is 60% for the base material layer and 40% for the adhesive layer.
And The casting conditions are 3 with an air knife.
It was pressed against a 0 ° C. cooling roll and molded.
【００２８】これら共押出により製造された表面保護フ
イルムにおいては、粘着層の組成、特性等が本発明で特
定した範囲内にあるものは、粘着性、密着性、耐熱性、
板汚れ、断裁性の全てが実用範囲にあり、特に断裁性に
極めて優れたものが得られた。いずれかの条件が本発明
の範囲から外れたもの（比較例１０〜１７）は、上記特
性のうち少なくとも一つは満足できなかった。結果を表
１〜表３に示す。表中において、略号の意味は次の通り
である。 ＬＤＰＥ：低密度ポリエチレン ＬＬＰＥ：直鎖状低密度ポリエチレン ＭＩ ：メルトインデックス ＳＲ ：スウェル比 ＥＶＡ ：エチレン−酢酸ビニル共重合体 なお、「付与剤」とは粘着性付与剤のことであり、ロジ
ン系樹脂を用いた。また、比較例１５においては、フェ
ノール系酸化防止剤を３０００ｐｐｍ添加、比較例１７
においては界面活性剤（三洋化成（株）製、ニューポー
ルＰＥ６２）を２５０ｐｐｍ添加した。Among the surface protective films produced by these coextrusions, those whose composition, characteristics, etc. of the adhesive layer are within the ranges specified in the present invention are those having adhesiveness, adhesiveness, heat resistance,
All of the plate stains and the cutting property were within the practical range, and particularly, the cutting property was extremely excellent. At least one of the above characteristics was not satisfied when any of the conditions deviated from the range of the present invention (Comparative Examples 10 to 17). The results are shown in Tables 1 to 3. In the table, the meanings of the abbreviations are as follows. LDPE: Low-density polyethylene LLPE: Linear low-density polyethylene MI: Melt index SR: Swell ratio EVA: Ethylene-vinyl acetate copolymer The "giving agent" is a tackifier and is a rosin resin. Was used. Further, in Comparative Example 15, 3000 ppm of a phenolic antioxidant was added, and Comparative Example 17
In the above, 250 ppm of a surfactant (New Pole PE62 manufactured by Sanyo Kasei Co., Ltd.) was added.
【００２９】[0029]
【表１】 [Table 1]
【００３０】[0030]
【表２】 [Table 2]
【００３１】[0031]
【表３】 [Table 3]
【００３２】[0032]
【発明の効果】以上説明したように、本発明の表面保護
フイルムによるときは、表面粗さを特定値以下とした、
低密度ポリエチレンを主成分とする粘着層を積層するこ
とによって、低密度ポリエチレンが元々有する優れた耐
熱性、断裁性を活かしつつ、表面平滑化、高温溶融押出
により密着性、粘着性を大幅に向上でき、これらの特性
全てに優れた表面保護フイルムを得ることができる。As described above, when the surface protective film of the present invention is used, the surface roughness is set to a specific value or less.
By laminating an adhesive layer consisting of low-density polyethylene as a main component, while utilizing the excellent heat resistance and cutting properties that low-density polyethylene originally has, surface smoothing and high-temperature melt extrusion significantly improve adhesion and adhesiveness. It is possible to obtain a surface protective film excellent in all of these characteristics.
Claims (2)
密度０．９１ｇ／ｃｍ3 ないし０．９３ｇ／ｃｍ3 の低
密度ポリエチレンを５０重量％以上含み表面粗さが中心
線平均粗さＲａにて０．０５μｍ以下である粘着層を積
層したことを特徴とする表面保護フイルム。1. On one surface of a base material layer made of polyethylene,
It is no density 0.91 g / cm 3, characterized in that the surface roughness comprises a low density polyethylene 0.93 g / cm 3 50% by weight or more are laminated to adhesive layer is 0.05μm or less in the center line average roughness Ra And a surface protection film.
ないし０．９３ｇ／ｃｍ3 の直鎖状低密度ポリエチレン
を５０重量％未満含んでいる請求項１の表面保護フイル
ム。2. The adhesive layer has a density of 0.91 g / cm 3
A surface protective film according to claim 1 which contains less than 50% by weight of linear low density polyethylene of 0.93 g / cm 3 to 0.93 g / cm 3 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04073229A JP3103190B2 (en) | 1992-02-25 | 1992-02-25 | Surface protection film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04073229A JP3103190B2 (en) | 1992-02-25 | 1992-02-25 | Surface protection film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05229080A true JPH05229080A (en) | 1993-09-07 |
| JP3103190B2 JP3103190B2 (en) | 2000-10-23 |
Family
ID=13512147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04073229A Expired - Lifetime JP3103190B2 (en) | 1992-02-25 | 1992-02-25 | Surface protection film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3103190B2 (en) |
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