JPH08333557A - Surface protecting film - Google Patents
Surface protecting filmInfo
- Publication number
- JPH08333557A JPH08333557A JP14072395A JP14072395A JPH08333557A JP H08333557 A JPH08333557 A JP H08333557A JP 14072395 A JP14072395 A JP 14072395A JP 14072395 A JP14072395 A JP 14072395A JP H08333557 A JPH08333557 A JP H08333557A
- Authority
- JP
- Japan
- Prior art keywords
- film
- weight
- ethylene
- protective film
- surface protective
- 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.)
- Pending
Links
Landscapes
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、表面保護フィルムに関
する。FIELD OF THE INVENTION The present invention relates to a surface protective film.
【0002】[0002]
【従来の技術】表面保護フィルムは、熱可塑性樹脂等の
基材の一面に粘着層が形成された構造を有し、適度の粘
着力(仮着性)を有すると共に、使用後に、合成樹脂
板、化粧合板、金属板、塗装鋼板等の各種被着体の表面
に上記表面保護フィルムの粘着層の一部が剥離して残っ
たり、又は、粘着層に含有する物質が移行してその表面
を汚損することなく容易に剥離できるものでなければな
らない。2. Description of the Related Art A surface protective film has a structure in which an adhesive layer is formed on one surface of a base material such as a thermoplastic resin, has an appropriate adhesive force (temporary adhesion), and after use, a synthetic resin plate. , A part of the adhesive layer of the surface protective film is peeled off and left on the surface of various adherends such as a decorative plywood, a metal plate, and a coated steel plate, or a substance contained in the adhesive layer migrates to the surface. It must be easy to peel off without fouling.
【0003】更に、上記表面保護フィルムを被着体に仮
着したままで機械加工を施す場合があるが、こうした場
合には、本来、表面保護フィルムに要求される上記仮着
性と再剥離性に加えて、機械加工性を具えていることが
要求される。既存の表面保護フィルム用基材フィルムの
中では、軟質塩化ビニル樹脂製フィルムが最も適してい
るので、カレンダー成形法や押出成形法等によって成形
された軟質塩化ビニル樹脂製フィルムを基材とし、その
一面に粘着剤層を設けた表面保護フィルムが汎用されて
いる。Further, the surface protection film may be machined while it is temporarily attached to the adherend. In such a case, the temporary adhesion and removability which are originally required for the surface protection film are required. In addition, it is required to have machinability. Among the existing base film for surface protection film, since the soft vinyl chloride resin film is most suitable, the soft vinyl chloride resin film formed by the calendar molding method or the extrusion molding method is used as the base material, A surface protective film having an adhesive layer on one surface is widely used.
【0004】しかしながら、軟質塩化ビニル樹脂製フィ
ルムは、用済み後の廃棄焼却の際に発生する塩素系ガス
の環境上の問題等から、これに替わる表面保護フィルム
として用済み後の廃棄処理の比較的容易なオレフィン系
樹脂製フィルムの採用が検討されてきた。However, a soft vinyl chloride resin film is used as an alternative surface protection film because of the environmental problems of chlorine-based gas generated during waste incineration after use. The adoption of an olefin resin film, which is easy to use, has been considered.
【0005】上記表面保護フィルムの機械加工性として
は、機械加工時に被着体の変形に追従して変形はする
が、それ以上に変形して被着体表面から浮いたり剥離し
たりせず、さりとて、上記負荷応力がそのまま局部的に
残存せずに直ちに緩和する性質、換言すれば、変形時に
塑性変形が小さく、応力緩和性、伸長回復性に優れてい
ることが求められる。As for the machinability of the surface protective film, it deforms following the deformation of the adherend during machining, but it does not deform further and does not float or peel off from the surface of the adherend. In the meantime, it is required that the above-mentioned load stress does not locally remain as it is and is immediately relaxed, in other words, plastic deformation is small at the time of deformation, and stress relaxation and elongation recovery are excellent.
【0006】上記表面保護フィルムの機械加工性は、主
として基材層の性能の寄与するところが大きいが、粘着
剤層の被着体界面における接着力とも関連し、機械加工
時に被着体表面から表面保護フィルムが剥離することを
防止するために粘着剤層の接着力を大きくすると、用済
み後、被着体表面から表面保護フィルムが剥離し難くな
る、所謂接着昂進性が問題となる。The machinability of the surface protective film largely contributes to the performance of the base material layer, but is also related to the adhesive force at the interface of the adherend of the pressure-sensitive adhesive layer. If the adhesive force of the pressure-sensitive adhesive layer is increased in order to prevent the protective film from peeling off, there is a problem of so-called adhesion progressing property, which makes it difficult to peel off the surface protective film from the surface of the adherend after use.
【0007】上記の諸問題を改善する試みとして、例え
ば、特開昭52−62347号公報には、粘着剤組成物
100重量部に対して、燐酸エステルもしくは/または
その誘導体を0.001重量部以上0.5重量部未満添
加してなる表面保護シート用粘着剤組成物を、片面にコ
ロナ処理を施してなるポリエチレンフィルムに乾燥後の
厚みが10μとなるように塗布、乾燥して作製された表
面保護シートが開示されている。As an attempt to improve the above problems, for example, in JP-A-52-62347, 0.001 part by weight of a phosphoric acid ester or / or its derivative is added to 100 parts by weight of an adhesive composition. A pressure-sensitive adhesive composition for a surface protection sheet, which was added in an amount of less than 0.5 parts by weight, was applied to a polyethylene film having one surface subjected to corona treatment so that the thickness after drying was 10 μm, and dried. A surface protection sheet is disclosed.
【0008】しかし、上記特開昭52−62347号公
報に開示された表面保護シートは、用いられる燐酸エス
テルもしくは/またはその誘導体の種類や配合量に応じ
た接着昂進性は改善されるかも知れないが、ポリエチレ
ンフィルムに関する詳細な記載がないので、一般的な低
密度ポリエチレンフィルムと解すれば、上記機械加工性
に適合するものではない。However, in the surface protective sheet disclosed in the above-mentioned Japanese Patent Laid-Open No. 52-62347, the adhesion promoting property may be improved depending on the type and blending amount of the phosphoric acid ester or / or its derivative used. However, since there is no detailed description about the polyethylene film, it is not suitable for the above machinability if it is understood as a general low density polyethylene film.
【0009】又、特開昭54−133577号公報に
は、ポリエチレン系樹脂層と接着性樹脂層とからなる積
層フィルムにおいて、前記ポリエチレン系樹脂層が低密
度ポリエチレン100重量部に対し酢酸ビニル含量20
重量%以上のエチレン−酢酸ビニル共重合体3〜60重
量部及び可塑剤1〜35重量部を配合してなる組成物よ
り成り、かつ、前記接着性樹脂層がエチレン−不飽和エ
ステル共重合体層より成る積層フィルムが開示されてい
る。Further, in JP-A-54-133577, in a laminated film comprising a polyethylene resin layer and an adhesive resin layer, the polyethylene resin layer has a vinyl acetate content of 20 parts by weight per 100 parts by weight of low density polyethylene.
A composition comprising 3 to 60 parts by weight of an ethylene-vinyl acetate copolymer and 1 to 35 parts by weight of a plasticizer, wherein the adhesive resin layer is an ethylene-unsaturated ester copolymer. Laminated films of layers are disclosed.
【0010】しかし、上記特開昭54−133577号
公報に開示された積層フィルムは、ポリエチレン系樹脂
層に使用される低密度ポリエチレンには特に限定がな
く、一般の市販の任意の低密度ポリエチレンが使用さ
れ、これに酢酸ビニル含量20重量%以上のエチレン−
酢酸ビニル共重合体が配合されるものであるので、ポリ
エチレン系樹脂層と接着性樹脂層との界面における接着
力が向上し、被着体に対する接着力も向上するが、経時
的に接着昂進し、用済み後、被着体表面から表面保護フ
ィルムが剥離しに難くなり、且つ又、機械加工時におけ
る変形時に塑性変形が小さく、応力緩和性、伸長回復性
が大きいという要求品質には応えられるものではない。However, in the laminated film disclosed in JP-A-54-133577, the low density polyethylene used for the polyethylene resin layer is not particularly limited, and any general commercially available low density polyethylene can be used. It is used with ethylene containing more than 20% by weight of vinyl acetate.
Since the vinyl acetate copolymer is blended, the adhesive strength at the interface between the polyethylene resin layer and the adhesive resin layer is improved, and the adhesive strength to the adherend is also improved, but the adhesion progresses over time, It is possible to meet the required quality that the surface protective film is difficult to peel off from the surface of the adherend after use, and the plastic deformation is small at the time of deformation during machining, stress relaxation and elongation recovery are large. is not.
【0011】[0011]
【発明が解決しようとする課題】本発明は、叙上の事実
に鑑みなされたものであって、その目的とするところ
は、変形時に塑性変形が小さく、応力緩和性、伸長回復
性に優れ、且つ、経時接着昂進の少ない表面保護フィル
ムを提供するにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above facts, and an object of the present invention is to reduce plastic deformation during deformation, to provide excellent stress relaxation and elongation recovery. In addition, the object is to provide a surface protective film with little progress of adhesion over time.
【0012】[0012]
【課題を解決するための手段】本発明は、エチレン−プ
ロピレン共重合体及び/又はエチレン−プロピレン以外
のα−オレフィン共重合体からなる結晶化度が45%以
下のポリオレフィンに分子量が300〜1000である
可塑剤を3〜30重量%添加してなる基材の一面に粘着
層が設けられていることを特徴とする表面保護フィルム
をその要旨とするものである。The present invention relates to a polyolefin having a crystallinity of 45% or less, which comprises an ethylene-propylene copolymer and / or an α-olefin copolymer other than ethylene-propylene and has a molecular weight of 300 to 1,000. The surface protection film is characterized in that an adhesive layer is provided on one surface of a substrate formed by adding 3 to 30% by weight of the plasticizer.
【0013】本発明において、基材に用いられる結晶化
度が45%以下のポリオレフィンは、エチレン−プロピ
レン共重合体及び/又はエチレン−プロピレン以外のα
−オレフィン共重合体からなるものであるが、上記α−
オレフィンとしては、例えば、1−ブテン、1−ヘキセ
ン、1−オクテン等が挙げられる。上記ポリオレフィン
の結晶化度が45%を超える場合、変形時に塑性変形が
小さく、応力緩和性、伸長回復性に優れた基材フィルム
を与えない。In the present invention, the polyolefin having a crystallinity of 45% or less, which is used as the base material, is an ethylene-propylene copolymer and / or an α-other than ethylene-propylene.
-Although it is composed of an olefin copolymer, the above α-
Examples of the olefin include 1-butene, 1-hexene, 1-octene and the like. When the degree of crystallinity of the polyolefin exceeds 45%, plastic deformation is small at the time of deformation, and a base film having excellent stress relaxation property and elongation recovery property is not provided.
【0014】上記エチレン−プロピレン共重合体及び/
又はエチレン−プロピレン以外のα−オレフィン共重合
体からなる結晶化度が45%以下のポリオレフィンは、
結晶化度が45%以下に制御される重合法であれば、如
何なる重合法が採られてもよいが、リアクターブレンド
法により共重合することにより容易に得ることができ
る。ここで、リアクターブレンド法とは、重合が1回で
終了するのではなく、2段階以上の多段重合を行うこと
により、複数の種類のポリマーを連続して製造すること
ができる重合法であり、機械的な手法を用いて異種のポ
リマーからなる混合樹脂を得るところの、所謂、通常の
ポリマーブレンド法とは全く異なる手法であって、分子
レベルでのブレンドタイプの共重合樹脂を生産する方法
である。こうして得られる結晶化度が45%以下のポリ
オレフィンは、各共重合体成分が微細に分散することに
より、混合される共重合体成分が具有するところの、性
質の異なる各種の性質を漏れなく忠実に具現したものが
得られる。具体的な製造方法としては、例えば、特開平
3−205439号公報に記載された方法がある。The above ethylene-propylene copolymer and /
Alternatively, a polyolefin having a crystallinity of 45% or less, which is composed of an α-olefin copolymer other than ethylene-propylene,
Any polymerization method may be adopted as long as the crystallinity is controlled to 45% or less, but it can be easily obtained by copolymerization by a reactor blending method. Here, the reactor blending method is a polymerization method in which a plurality of types of polymers can be continuously produced by performing multi-stage polymerization of two or more steps, instead of completing the polymerization once. It is a completely different method from the so-called ordinary polymer blending method in which a mixed resin composed of different polymers is obtained using a mechanical method, and it is a method of producing a blend type copolymer resin at the molecular level. is there. The polyolefin having a crystallinity of 45% or less obtained in this manner faithfully retains various properties of the mixed copolymer components, which are different from each other, by finely dispersing the copolymer components. You can get what you embody. As a specific manufacturing method, for example, there is a method described in JP-A-3-205439.
【0015】上記分子量が300〜1000である可塑
剤としては、特に限定されるものではないが、例えば、
ジ−(2−エチルヘキシル)フタレート、ジデシルフタ
レート等のフタル酸エステル系可塑剤、ジ−(2−エチ
ルヘキシル)アジペート、ジデシルアジペート等のアジ
ピン酸エステル系可塑剤、ジ−(2−エチルヘキシル)
アゼラエート、ジデシルアゼラエート等のアゼライン酸
エステル系可塑剤、ジ−(2−エチルヘキシル)セバケ
ート、ジデシルセバケート等のセバシン酸エステル系可
塑剤、2−エチルヘキシルオレエート等のオレイン酸エ
ステル系可塑剤、トリオクチルトリメリテート、テトラ
オクチルピロメリテートの如きトリメリット酸エステル
系可塑剤、ピロメリット酸エステル系可塑剤、アジピン
酸系、アゼライン酸系、セバシン酸系等のポリエステル
系可塑剤、塩素化ポリオレフィン系可塑剤等が挙げられ
る。The plasticizer having a molecular weight of 300 to 1000 is not particularly limited, but for example,
Di- (2-ethylhexyl) phthalate, didecyl phthalate and other phthalate ester plasticizers, di- (2-ethylhexyl) adipate, didecyl adipate and other adipate ester plasticizers, di- (2-ethylhexyl)
Azelaic acid ester plasticizers such as azelaate and didecyl azelaate, sebacate ester plasticizers such as di- (2-ethylhexyl) sebacate and didecyl sebacate, oleic acid ester plasticizers such as 2-ethylhexyl oleate Agents, trimellitic acid ester-based plasticizers such as trioctyl trimellitate, tetraoctyl pyromellitate, pyromellitic acid ester-based plasticizers, adipic acid-based, azelaic acid-based, sebacic acid-based polyester plasticizers, chlorine Included are polyolefinized plasticizers and the like.
【0016】上記可塑剤の分子量が300未満の場合、
基材層に存する該可塑剤が粘着剤層に著しく移行し、粘
着性能を低下せしめると同時に被着体に対する汚染の度
合いが大きくなり、逆に、分子量が1000を超える
と、上記ポリオレフィンとの相溶性が低下し、十分な基
材性能が得られない他、粘着剤層への拡散が阻害され接
着昂進抑制効果が十分にえられない等、いずれも好まし
くない。When the plasticizer has a molecular weight of less than 300,
When the plasticizer present in the base material layer remarkably migrates to the pressure-sensitive adhesive layer, the adhesive performance is deteriorated, and at the same time, the degree of contamination of the adherend is increased. On the contrary, when the molecular weight exceeds 1,000, the phase with the polyolefin is The solubility is lowered, sufficient base material performance cannot be obtained, diffusion to the pressure-sensitive adhesive layer is inhibited, and the effect of suppressing adhesion promotion cannot be sufficiently obtained.
【0017】上記分子量が300〜1000である可塑
剤の添加量は、上記結晶化度が45%以下のポリオレフ
ィンに対し3〜30重量%であるが、上記添加割合が3
重量%未満では、添加の効果が十分に発現せず、又、添
加割合が30重量%を超える場合には、可塑剤の粘着剤
層への移行量が増加し、粘着剤層のアンカーが低下する
等、粘着性能を低下せしめると同時に被着体に対する汚
染の度合いが大きくなる。The plasticizer having a molecular weight of 300 to 1000 is added in an amount of 3 to 30% by weight based on the polyolefin having a crystallinity of 45% or less.
If it is less than 10% by weight, the effect of the addition is not sufficiently exhibited, and if the addition ratio exceeds 30% by weight, the amount of the plasticizer transferred to the pressure-sensitive adhesive layer increases and the anchor of the pressure-sensitive adhesive layer decreases. As a result, the adhesion performance is deteriorated and at the same time, the degree of contamination of the adherend is increased.
【0018】猶、表面保護フィルムの実用性を高めるた
めに、剥離剤を基材の背面に使用したり、柔軟な基材で
ある関係上、表面が滑り難くなるので、表層部に別の樹
脂層を積層したり、基材を構成する原材料中に、本発明
の狙いとする効果を損なわない範囲内で、他の配合物、
例えば、充填剤や着色剤等を使用することができる。In order to improve the practicality of the surface protective film, a release agent is used on the back surface of the base material, or the flexible base material prevents the surface from slipping. Within the range of not impairing the effect aimed at by the present invention, in the raw materials for laminating layers or constituting the base material, other compounds,
For example, a filler or a coloring agent can be used.
【0019】前述の原料を用いて、本発明の表面保護フ
ィルムの基材を得る場合、その基材層の厚さとしては、
適用される被着体の板厚によっても異なるが、通常30
〜100μmである。上記表面保護フィルムの基材を得
る方法としては、特に限定されるものではないが、例え
ば、Tダイやサーキュラーダイを用いた押出成形法、カ
レンダー成形法、キャスティング法等が挙げられる。When the substrate of the surface protective film of the present invention is obtained using the above-mentioned raw materials, the thickness of the substrate layer is
Although it depends on the thickness of the adherend to be applied, it is usually 30
˜100 μm. The method for obtaining the base material of the surface protective film is not particularly limited, and examples thereof include an extrusion molding method using a T die and a circular die, a calender molding method, and a casting method.
【0020】又、本発明の表面保護フィルムに使用する
粘着剤としては、表面保護フィルムとしての機能を満足
し得るものであれば、特に限定されるものではなく、例
えば、ゴム系、アクリル系等の粘着剤が挙げられる。上
記粘着剤層の形成手段としては、特に限定されるもので
はなく、例えば、塗工法、共押出法等が挙げられる。The pressure-sensitive adhesive used in the surface protective film of the present invention is not particularly limited as long as it can fulfill the function of the surface protective film, and examples thereof include rubber-based and acrylic-based adhesives. Adhesive of. The means for forming the pressure-sensitive adhesive layer is not particularly limited, and examples thereof include a coating method and a coextrusion method.
【0021】[0021]
【作用】本発明の表面保護フィルムは、エチレン−プロ
ピレン共重合体及び/又はエチレン−プロピレン以外の
α−オレフィン共重合体からなる結晶化度が45%以下
のポリオレフィンに分子量が300〜1000である可
塑剤を3〜30重量%添加してなる基材の一面に粘着剤
層が設けられているものであるので、金属板等の被着体
に表面保護フィルムを仮着したまま、曲げ加工や絞り加
工等の機械加工を施す場合の変形時に塑性変形が小さ
く、応力緩和性、伸長回復性に優れており、且つ、経時
接着昂進が少ない。In the surface protective film of the present invention, a polyolefin having a crystallinity of 45% or less and comprising an ethylene-propylene copolymer and / or an α-olefin copolymer other than ethylene-propylene has a molecular weight of 300 to 1,000. Since the pressure-sensitive adhesive layer is provided on one surface of the base material formed by adding the plasticizer in an amount of 3 to 30% by weight, it is possible to perform bending or bending while the surface protection film is temporarily attached to the adherend such as a metal plate. Plastic deformation is small at the time of deformation during mechanical processing such as drawing, stress relaxation and elongation recovery are excellent, and adhesion progress over time is small.
【0022】上記の如き本発明の表面保護フィルムの効
果は、エチレン−プロピレン共重合体及び/又はエチレ
ン−プロピレン以外のα−オレフィン共重合体からなる
結晶化度が45%以下のポリオレフィンを使用すること
により、降伏点強度を低い値に抑制し、適度の弾性率を
保持せしめることによって、上記被着体の機械加工時
に、被着体の変形に追従して変形はするが、それ以上に
変形して被着体表面から浮いたり剥離したりせず、さり
とて、上記負荷応力がそのまま局部的に残存せずに直ち
に緩和する性質、換言すれば、変形時に塑性変形が小さ
く、応力緩和性、伸長回復性が具現されるものといえ
る。The effect of the surface protective film of the present invention as described above is to use a polyolefin comprising an ethylene-propylene copolymer and / or an α-olefin copolymer other than ethylene-propylene and having a crystallinity of 45% or less. By suppressing the yield point strength to a low value and maintaining an appropriate elastic modulus, it deforms following the deformation of the adherend during machining of the adherend, but further deforms By the way, it does not float or peel off from the surface of the adherend, but rather, the above-mentioned load stress does not locally remain as it is and is immediately relaxed, in other words, plastic deformation is small during deformation, stress relaxation, elongation It can be said that recoverability is realized.
【0023】又、上記基材層のポリオレフィン分子の非
結晶部分に前記する範囲の割合で添加された可塑剤分子
が比較的安定して分散保持されており、前記する基材の
好ましい物性を具現し、加えて、上記機械加工における
変形時に僅かにしかし継続してブリードしてきた上記可
塑剤が、被着体との界面における適度の滑り性をも与え
ることが相俟って前記する優れた機械加工特性を具有す
るものと推定される。Further, the plasticizer molecules added to the amorphous portion of the polyolefin molecules of the above base material layer in a ratio within the above range are relatively stably dispersed and held, and the preferable physical properties of the above base material are realized. In addition, the plasticizer, which bleeds slightly but continuously during deformation in the machining, also provides appropriate slipperiness at the interface with the adherend, and in combination with the excellent machine described above. It is presumed to have processing characteristics.
【0024】[0024]
【実施例】以下、本発明の実施例について説明する。 (実施例1)エチレン−α−オレフィン共重合体(三井
石油化学社製、商品名:ウルトゼックス1520)10
0重量部にジオクチルフタレート5重量部を添加し、T
ダイ法にて厚さ100μmの基材を作製し、該基材の一
面にコロナ放電処理を施し、該処理面にアクリル系粘着
剤(綜研化学社製、商品名:AG105)を乾燥後の厚
さが7μmとなるように塗工して表面保護フィルムを作
製した。Embodiments of the present invention will be described below. (Example 1) Ethylene-α-olefin copolymer (manufactured by Mitsui Petrochemical Co., Ltd., trade name: ULTOZEX 1520) 10
5 parts by weight of dioctyl phthalate was added to 0 parts by weight,
A substrate having a thickness of 100 μm is prepared by a die method, one surface of the substrate is subjected to corona discharge treatment, and an acrylic adhesive (manufactured by Soken Chemical Co., Ltd., trade name: AG105) is dried on the treated surface. To give a surface protection film.
【0025】(実施例2)実施例1のエチレン−α−オ
レフィン共重合体に替えて、エチレン−プロピレン共重
合体(ハイモント社製、商品名:ハイファックスNKS
021P)を使用したこと以外、実施例1と同様にして
表面保護フィルムを作製した。Example 2 Instead of the ethylene-α-olefin copolymer of Example 1, an ethylene-propylene copolymer (manufactured by Highmont, trade name: HYFAX NKS) was used.
A surface protective film was produced in the same manner as in Example 1 except that 021P) was used.
【0026】(実施例3)実施例2の可塑剤ジオクチル
フタレート5重量部に替えて、トリメリット酸オクチル
10重量部を使用したこと以外、実施例2と同様にして
表面保護フィルムを作製した。Example 3 A surface protective film was prepared in the same manner as in Example 2 except that 10 parts by weight of octyl trimellitate was used instead of 5 parts by weight of the plasticizer dioctyl phthalate of Example 2.
【0027】(実施例4)実施例2の可塑剤ジオクチル
フタレート5重量部に替えて、塩素化パラフィン5重量
部を使用したこと以外、実施例2と同様にして表面保護
フィルムを作製した。Example 4 A surface protective film was produced in the same manner as in Example 2 except that 5 parts by weight of chlorinated paraffin was used instead of 5 parts by weight of the plasticizer dioctyl phthalate of Example 2.
【0028】(比較例1)エチレン−α−オレフィン共
重合体(三井石油化学社製、商品名:ウルトゼックス3
520)100重量部にジオクチルフタレート10重量
部を添加し、Tダイ法にて厚さ100μmの基材を作製
し、以下実施例1と同様にして表面保護フィルムを作製
した。Comparative Example 1 Ethylene-α-olefin copolymer (manufactured by Mitsui Petrochemical Co., Ltd., trade name: ULTOZEX 3
520) 10 parts by weight of dioctyl phthalate was added to 100 parts by weight, and a substrate having a thickness of 100 μm was prepared by the T-die method, and then a surface protective film was prepared in the same manner as in Example 1.
【0029】(比較例2)実施例1の可塑剤ジオクチル
フタレートの添加量を50重量部に変更したこと以外、
実施例1と同様にして表面保護フィルムを作製した。(Comparative Example 2) Except that the addition amount of the plasticizer dioctyl phthalate in Example 1 was changed to 50 parts by weight,
A surface protective film was produced in the same manner as in Example 1.
【0030】(比較例3)実施例1の可塑剤ジオクチル
フタレートの添加量を1重量部に変更したこと以外、実
施例1と同様にして表面保護フィルムを作製した。Comparative Example 3 A surface protective film was prepared in the same manner as in Example 1 except that the amount of the plasticizer dioctyl phthalate added in Example 1 was changed to 1 part by weight.
【0031】(比較例4)実施例1の可塑剤ジオクチル
フタレートに替えてジブチルフタレート10重量部を使
用したこと以外、実施例1と同様にして表面保護フィル
ムを作製した。Comparative Example 4 A surface protective film was produced in the same manner as in Example 1 except that 10 parts by weight of dibutyl phthalate was used instead of the plasticizer dioctyl phthalate of Example 1.
【0032】(比較例5)実施例1の可塑剤ジオクチル
フタレートに替えて、分子量1000以上のアジピン酸
系ポリエステル可塑剤10重量部を使用したこと以外、
実施例1と同様にして表面保護フィルムを作製した。(Comparative Example 5) The plasticizer dioctyl phthalate of Example 1 was replaced with 10 parts by weight of an adipic acid polyester plasticizer having a molecular weight of 1000 or more.
A surface protective film was produced in the same manner as in Example 1.
【0033】上記実施例及び比較例で得られた表面保護
フィルムの結晶化度、初期粘着力、経時後剥離力、変形
時の降伏点の有無、伸長回復率、応力残存率並びに曲げ
加工性及び被着体汚染性について以下に示す方法で試験
し、評価した。結果は表1に示す。The surface protection films obtained in the above Examples and Comparative Examples had crystallinity, initial adhesion, peeling strength after aging, yield point during deformation, elongation recovery rate, stress residual rate and bending workability. The stain resistance of the adherend was tested and evaluated by the following method. The results are shown in Table 1.
【0034】1.フィルムの結晶化度:Tダイ法で得ら
れたフィルムをコロナ放電処理前にサンプリングし、示
差熱分析法(Differenntial Scanning Calorimetry)に
よって結晶化度を測定した。1. Film crystallinity: The film obtained by the T-die method was sampled before the corona discharge treatment, and the crystallinity was measured by a differential thermal analysis method (Differenntial Scanning Calorimetry).
【0035】2.初期粘着力:得られた表面保護フィル
ムから幅25mmの試験片を切り出し、これをステンレ
ス鋼板(日新製鋼社製、商品名:SUS#304HL)
表面に、23℃×65%RHの環境下において、2kg
ローラーにて貼り合わせて20分間放置後、剥離速度3
00mm/minにおける180度剥離粘着力を測定し
た。2. Initial adhesive strength: A test piece having a width of 25 mm was cut out from the obtained surface protection film, and a stainless steel plate (manufactured by Nisshin Steel Co., Ltd., trade name: SUS # 304HL)
2kg on the surface under the environment of 23 ℃ × 65% RH
After sticking with a roller and leaving for 20 minutes, peeling speed 3
The 180-degree peel adhesive strength at 00 mm / min was measured.
【0036】3.経時後剥離力:前項の初期粘着力試験
で使用したと同様に幅25mmの試験片をステンレス鋼
板に貼り合わせ、屋外に1ケ月間暴露後、23℃×65
%RHの環境下において180度剥離力を測定した。
猶、接着不良にて測定前に表面保護フィルムが剥離して
しまったものについて「剥離」の表示をした。3. Peeling force after aging: A test piece having a width of 25 mm was attached to a stainless steel plate in the same manner as that used in the initial adhesive strength test in the previous section, and exposed outdoors for 1 month, and then at 23 ° C. × 65.
The 180-degree peel force was measured under the environment of% RH.
When the surface protection film was peeled off before the measurement due to poor adhesion, "peeling" was displayed.
【0037】4.変形時の降伏点の有無:Tダイ法で得
られたフィルムから長さ40mm×幅10mmの試験片
を切り出し、引張速度200mm/minで伸長し、変
形時の降伏点の有無を確認した。表示は、降伏点が現れ
ないもの:無、僅かに降伏点が認められるもの:微有、
明確に降伏点を示すもの:有、の3段階で評価した。4. Presence or absence of yield point during deformation: A test piece having a length of 40 mm and a width of 10 mm was cut out from the film obtained by the T-die method and stretched at a tensile speed of 200 mm / min to confirm the presence or absence of a yield point during deformation. The display shows no yield point: none, a slight yield point is recognized: slight
Those with a clear yield point: Yes
【0038】5.伸長回復率:Tダイ法で得られたフィ
ルムから幅10mmの試験片を切り出し、チャック間隔
を40mmとして引張試験機にて引張速度200mm/
minで伸長し、長さが倍の80mmになった直後に、
引張力を開放し、5分経過後の長さを測定し、80mm
から測定長さを減じ、元の長さ40mmで割った値の百
分率を伸長回復率として表示した。5. Elongation recovery rate: A test piece with a width of 10 mm was cut out from the film obtained by the T-die method, and the chuck interval was 40 mm, and the tensile speed was 200 mm / in a tensile tester.
Immediately after stretching at min and doubling the length to 80 mm,
Release the tensile force and measure the length after 5 minutes, 80 mm
The measured length was subtracted from the above, and the percentage of the value obtained by dividing the original length by 40 mm was expressed as the elongation recovery rate.
【0039】6.応力残存率:前項の伸長回復率と同様
に幅10mmの試験片をチャック間隔を40mmとして
引張試験機にて引張速度200mm/minで伸長し、
長さが倍の80mmになった時の引張強度で、同長さに
伸長した状態に5分間放置し、5分後の引張強度を割っ
た値の百分率を応力残存率として表示した。6. Residual stress rate: Similar to the elongation recovery rate in the previous section, a test piece with a width of 10 mm was stretched at a tensile speed of 200 mm / min using a tensile tester with a chuck interval of 40 mm.
The tensile strength when the length was doubled to 80 mm was left for 5 minutes in the stretched state to the same length, and the percentage of the value obtained by dividing the tensile strength after 5 minutes was expressed as the stress residual rate.
【0040】7.曲げ加工性:得られた表面保護フィル
ムを厚さ1.5mmの上記ステンレス鋼板に貼り合わ
せ、ベンダーにて90度曲げ加工を行い、フィルムの切
れの有無、表面保護フィルムの浮きや剥離の有無等曲げ
加工性を観察した。観察結果は、円滑に曲げ加工され、
加工後もタイトに表面保護フィルムが貼着しているも
の:○、表面保護フィルムが浮いたり剥離したりしたも
の:×、加工中フィルムが切断したもの:「切れ」の表
示をおこなった。7. Bending processability: The obtained surface protection film was attached to the above-mentioned stainless steel plate having a thickness of 1.5 mm, and bent by a bender at 90 degrees, and the film was broken, and the surface protection film was lifted or peeled. The bending workability was observed. The observation result is smoothly bent,
The surface protection film adhered tightly after processing: ○, the surface protection film floated or peeled off: ×, the film cut during processing: “cut” was displayed.
【0041】8.被着体汚染性:前項の曲げ加工性試験
後、表面保護フィルムを剥離し、被着体の上記ステンレ
ス鋼板表面の糊残りの状況を観察した。観察結果を、糊
残りなし:無、糊残りが極僅かあるもの:微有、糊残り
が目立つもの:有、の3段階で評価した。8. Contamination property of adherend: After the bending workability test of the previous section, the surface protective film was peeled off, and the state of adhesive residue on the surface of the stainless steel plate of the adherend was observed. The observation results were evaluated in three grades: no adhesive residue: none, very little adhesive residue: slight, and significant adhesive residue: yes.
【0042】[0042]
【表1】 [Table 1]
【0043】[0043]
【発明の効果】本発明の表面保護フィルムは、叙上の如
く構成されているので、金属板等の被着体に表面保護フ
ィルムを仮着したまま、曲げ加工や絞り加工等の機械加
工を施す場合の変形時に塑性変形が小さく、応力緩和
性、伸長回復性に優れており、且つ、経時接着昂進が少
ない。Since the surface protective film of the present invention is constructed as described above, mechanical processing such as bending and drawing can be performed while the surface protective film is temporarily attached to an adherend such as a metal plate. The plastic deformation is small at the time of deformation when applied, the stress relaxation property and the elongation recovery property are excellent, and the adhesion progress with time is small.
Claims (1)
はエチレン−プロピレン以外のα−オレフィン共重合体
からなる結晶化度が45%以下のポリオレフィンに分子
量が300〜1000である可塑剤を3〜30重量%添
加してなる基材の一面に粘着剤層が設けられていること
を特徴とする表面保護フィルム。1. A polyolefin comprising an ethylene-propylene copolymer and / or an α-olefin copolymer other than ethylene-propylene having a crystallinity of 45% or less and a plasticizer having a molecular weight of 300 to 1000 of 3 to 30. A surface protective film, wherein a pressure-sensitive adhesive layer is provided on one surface of a base material added by weight%.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14072395A JPH08333557A (en) | 1995-06-07 | 1995-06-07 | Surface protecting film |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14072395A JPH08333557A (en) | 1995-06-07 | 1995-06-07 | Surface protecting film |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08333557A true JPH08333557A (en) | 1996-12-17 |
Family
ID=15275215
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14072395A Pending JPH08333557A (en) | 1995-06-07 | 1995-06-07 | Surface protecting film |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08333557A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6436531B1 (en) | 1998-07-20 | 2002-08-20 | 3M Innovative Properties Company | Polymer blends and tapes therefrom |
US6869666B2 (en) | 2001-05-02 | 2005-03-22 | 3M Innovative Properties Company | Controlled-puncture films |
KR101503978B1 (en) * | 2012-08-30 | 2015-03-18 | (주)엘지하우시스 | Olefin resin composition for protective film and protection film comprising the same |
-
1995
- 1995-06-07 JP JP14072395A patent/JPH08333557A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6436531B1 (en) | 1998-07-20 | 2002-08-20 | 3M Innovative Properties Company | Polymer blends and tapes therefrom |
US6869666B2 (en) | 2001-05-02 | 2005-03-22 | 3M Innovative Properties Company | Controlled-puncture films |
KR101503978B1 (en) * | 2012-08-30 | 2015-03-18 | (주)엘지하우시스 | Olefin resin composition for protective film and protection film comprising the same |
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