JP4993343B2 - Fluororesin adhesive film - Google Patents

Fluororesin adhesive film Download PDF

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JP4993343B2
JP4993343B2 JP2006190003A JP2006190003A JP4993343B2 JP 4993343 B2 JP4993343 B2 JP 4993343B2 JP 2006190003 A JP2006190003 A JP 2006190003A JP 2006190003 A JP2006190003 A JP 2006190003A JP 4993343 B2 JP4993343 B2 JP 4993343B2
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fluororesin
adhesive film
hydroxyl group
thermoplastic
film
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JP2008019297A (en
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慶悟 五色
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Junkosha Co Ltd
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本発明は、種々の無機材料や有機材料からなる基材に対して接着可能なフッ素樹脂製接着性フィルムに関し、特に加熱によって部材を接着することができるホットメルト接着剤としての作用を有するフッ素樹脂製接着性フィルムに関する。   TECHNICAL FIELD The present invention relates to a fluororesin adhesive film that can be bonded to a substrate made of various inorganic materials and organic materials, and in particular, a fluororesin having an action as a hot melt adhesive capable of bonding a member by heating. The present invention relates to an adhesive film.

ポリテトラフルオロエチレン、パーフルオロアルコキシアルカンポリマー、テトラフルオロエチレン−ヘキサフルオロプロピレン共重合体、エチレン−テトラフルオロエチレン共重合体等のフッ素樹脂は、電気特性、耐熱性、耐薬品性、耐候性、離型性、撥水性等の特性に優れており、電気・電子分野、半導体分野、自動車分野等、多くの分野で利用されている。   Fluorine resins such as polytetrafluoroethylene, perfluoroalkoxyalkane polymer, tetrafluoroethylene-hexafluoropropylene copolymer, and ethylene-tetrafluoroethylene copolymer have electrical properties, heat resistance, chemical resistance, weather resistance, release It has excellent properties such as moldability and water repellency, and is used in many fields such as the electric / electronic field, the semiconductor field, and the automobile field.

一方、フッ素樹脂は他材料との接着性に欠け、他材料と接着させるには、フッ素樹脂表面をナトリウムの液体アンモニア溶液、あるいはプラズマ等によって処理する必要がある。 また、フッ素樹脂と金属とを接着させるためには、金属表面をサンドブラスト等で粗面化したり、プライマーを塗布した後、フッ素樹脂の融点以上で融着させることが行われている。   On the other hand, fluororesins lack adhesion with other materials, and in order to adhere to other materials, it is necessary to treat the fluororesin surface with a liquid ammonia solution of sodium or plasma. Further, in order to bond the fluororesin and the metal, the metal surface is roughened by sandblasting or the like, or a primer is applied and then fused at a melting point of the fluororesin or higher.

そこで、こうした接着性の問題点を解決するために、水酸基等の官能基を有するフッ素樹脂を用いて他の部材との接着性を有する部材が提案されている(例えば、特許文献1参照)。
水酸基を含有する熱可塑性フッ素樹脂製のフィルムは、熱可塑性樹脂を押し出し成形等の方法によって所定の大きさ、および厚さに成形することにより製造することができる。
ところが、熱可塑性フッ素樹脂を押し出し成形等によって製造すると、均質なフィルム中に、ゲル状物質等の周囲とは異質な部分が生じることがあった。特に、厚みの薄いフィルムの場合には、フィルム上に突起状の変形が形成されることもあった。突起状の変形が形成されたフィルムでは、接着機能に悪影響を及ぼしたり外観上も問題が生じた。
特許第3674044号公報
Therefore, in order to solve such problems of adhesiveness, a member having adhesiveness to other members using a fluororesin having a functional group such as a hydroxyl group has been proposed (for example, see Patent Document 1).
A film made of a thermoplastic fluororesin containing a hydroxyl group can be produced by molding a thermoplastic resin into a predetermined size and thickness by a method such as extrusion molding.
However, when a thermoplastic fluororesin is produced by extrusion molding or the like, a portion different from the surroundings such as a gel-like substance may occur in a homogeneous film. In particular, in the case of a thin film, a protrusion-like deformation may be formed on the film. In the film in which the protrusion-like deformation is formed, the adhesion function is adversely affected and the appearance is problematic.
Japanese Patent No. 3674044

本発明は、熱可塑性フッ素樹脂からなる接着性フィルムにおいて、水酸基を含有する熱可塑性フッ素樹脂を押し出し成形してフィルムを作製した際に、ゲル状物質等が形成されて、フィルム上に突起が形成されたりすることがない熱可塑性フッ素樹脂からなる接着性フィルムを提供することを課題とするものである。   In the present invention, when an adhesive film made of a thermoplastic fluororesin is extruded to produce a film by extruding a thermoplastic fluororesin containing a hydroxyl group, a gel substance or the like is formed and protrusions are formed on the film. It is an object of the present invention to provide an adhesive film made of a thermoplastic fluororesin that is never used.

本発明の課題は、フッ素樹脂からなる接着性フィルムにおいて、フッ素樹脂が水酸基を有する熱可塑性フッ素樹脂100質量部に対して平均粒子径は5μm以下のペリレンレツド系有機顔料、焼成カオリン、酸化アルミニウムのいずれかをフィラーとして熱可塑性フッ素樹脂100重量部に対して0.001〜10質量部を配合して、融点以上の温度において溶融混練した後に成形した接着性フィルムによって解決することができる。 An object of the present invention is to provide an adhesive film made of a fluororesin, and any one of perylene red organic pigment, calcined kaolin, and aluminum oxide having an average particle diameter of 5 μm or less with respect to 100 parts by mass of the thermoplastic fluororesin having a hydroxyl group as the fluororesin. This can be solved by an adhesive film formed by blending 0.001 to 10 parts by mass with 100 parts by weight of the thermoplastic fluororesin as a filler and melt-kneading at a temperature equal to or higher than the melting point .

また、熱可塑性フッ素樹脂が、水酸基を有する含フッ素エチレン性単量体と、テトラフルオロエチレンおよびパーフルオロアルキルビニルエーテルとの共重合体である前記のフッ素樹脂からなる前記の接着性フィルムである。
以上のようなフッ素樹脂からなるフィルムとすることによって、フィルムの厚さが薄い場合であっても、異物の形成や突起がない加熱によって接合することが可能な接着性フィルムを得ることができる。
The thermoplastic fluororesin, a fluorine-containing ethylenic monomer having a hydroxyl group, an adhesive film prior Symbol made of the fluororesin is a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether.
By using a film made of a fluororesin as described above, an adhesive film that can be bonded by heating without formation of foreign matter or protrusions even when the film is thin can be obtained.

本発明のフッ素樹脂製の接着性フィルムは、熱可塑性樹脂として水酸基含有熱可塑性フッ素樹脂を用いたので、熱接着性が良好であると共に、該フィルムにはゲル状物や突起が形成されていないのでフィルムの厚さが薄い場合でも平滑性が良好な接着面を提供することができる。   Since the fluororesin adhesive film of the present invention uses a hydroxyl group-containing thermoplastic fluororesin as a thermoplastic resin, the thermal adhesiveness is good, and no gel-like object or protrusion is formed on the film. Therefore, even when the film is thin, an adhesive surface with good smoothness can be provided.

本発明は、水酸基を含有する熱可塑性フッ素樹脂の押出成形等によってフィルムを製造した際に発生するゲル状物あるいは突起は、微細なフィラーを配合することによって抑制することが可能であることを見いだしたものである。
水酸基を有する熱可塑性フッ素樹脂中に微細なフィラーを配合することによってゲル状物あるいは突起の生成が抑制される理由は定かではないが、ゲル状物あるいは突起は、押出成形時に、融点以上の温度に加熱混練される結果、熱可塑性フッ素樹脂の水酸基同士の会合、あるいは脱水反応によって発生するものと考えられる。
そして、熱可塑性フッ素樹脂中に配合した微細なフィラーがこのような反応を抑制する作用を果たし、異物となるゲル状物や突起の発生を防止しているものと考えられる。
The present invention has found that gel-like substances or protrusions generated when a film is produced by extrusion molding of a thermoplastic fluororesin containing a hydroxyl group can be suppressed by adding a fine filler. It is a thing.
The reason why the formation of a gel or protrusion is suppressed by blending a fine filler in a thermoplastic fluororesin having a hydroxyl group is not certain, but the gel or protrusion has a temperature higher than the melting point during extrusion. As a result of heating and kneading, it is considered to be generated by association of hydroxyl groups of the thermoplastic fluororesin or by a dehydration reaction.
And it is thought that the fine filler mix | blended in the thermoplastic fluororesin fulfill | performs the effect | action which suppresses such a reaction, and has prevented generation | occurrence | production of the gel-like thing and protrusion which become a foreign material.

本発明で使用することができるフィラーとしては、鉄、銀等の金属粉、シリカ、アルミナ、酸化チタン等の酸化物、水酸化アルミニウム、水酸化マグネシウム等の水酸化物、タルク、クレー、マイカ等のケイ酸塩、炭酸カルシウム等の炭酸塩、硫酸バリウム等の硫酸塩、カーボンブラック、グラファイトのような炭素粉末、ペリレンレツドのような有機顔料、炭化ケイ素、二硫化モリブデン、チタン酸カリウム等を挙げることができる。   Examples of fillers that can be used in the present invention include metal powders such as iron and silver, oxides such as silica, alumina, and titanium oxide, hydroxides such as aluminum hydroxide and magnesium hydroxide, talc, clay, and mica. Silicates, carbonates such as calcium carbonate, sulfates such as barium sulfate, carbon powders such as carbon black and graphite, organic pigments such as perylene red, silicon carbide, molybdenum disulfide, potassium titanate, etc. Can do.

また、使用するフィラーの平均粒子径は5μm以下である。好ましくは3μm以下であり、1μm以下がより好ましい。5μmよりも大きい場合には、フィルムを押出成形した場合に、1mm2 以上の大きさのゲル状物の発生を防ぐことができない。なお、本発明において、平均粒径は、重量平均粒径を意味する。
また、フィラーの配合割合は、水酸基を有する熱可塑性フッ素樹脂100重量部に対し、0.001〜10重量部であることが好ましく、0.001〜5重量部とすることが更に好ましい。
0.001重量部以下であると添加の効果が得られず、1mm2 以上のゲル状物の発生を防ぐことが困難となる。一方、10重量部よりも多くなると、熱可塑性フッ素樹脂フィルムの接着性や機械的強度等の特性に悪影響を及ぼす。
Moreover, the average particle diameter of the filler to be used is 5 micrometers or less. Preferably it is 3 micrometers or less, and 1 micrometer or less is more preferable. When it is larger than 5 μm, it is impossible to prevent the formation of a gel-like material having a size of 1 mm 2 or more when the film is extruded. In the present invention, the average particle diameter means a weight average particle diameter.
Further, the blending ratio of the filler is preferably 0.001 to 10 parts by weight, and more preferably 0.001 to 5 parts by weight with respect to 100 parts by weight of the thermoplastic fluororesin having a hydroxyl group.
If the amount is 0.001 part by weight or less, the effect of addition cannot be obtained, and it becomes difficult to prevent the generation of a gel-like material having a size of 1 mm 2 or more. On the other hand, if it exceeds 10 parts by weight, it adversely affects properties such as adhesiveness and mechanical strength of the thermoplastic fluororesin film.

本発明で使用する水酸基を有する熱可塑性フッ素樹脂は、水酸基を有する含フッ素エチレン性単量体と水酸基を有さないエチレン性単量体とを用いて共重合することによって製造することができる。
水酸基を有する含フッ素エチレン性単量体としては、CX2=CX1−Rf−CH2OHを挙げることができる。式中X、X1は同一または異なり、いずれも水素原子またはフッ素原子、Rfは炭素数1〜40の2価の含フッ素アルキレン基、炭素数1〜40の含フッ素オキシアルキレン基、炭素数1〜40のエーテル結合を含む含フッ素アルキレン基または炭素数1〜40のエーテル結合を含む含フッ素オキシアルキレン基を表す。
The thermoplastic fluororesin having a hydroxyl group used in the present invention can be produced by copolymerization using a fluorine-containing ethylenic monomer having a hydroxyl group and an ethylenic monomer having no hydroxyl group.
Examples of the fluorine-containing ethylenic monomer having a hydroxyl group include CX 2 = CX 1 —R f —CH 2 OH. In the formula, X and X 1 are the same or different, both are hydrogen atoms or fluorine atoms, R f is a divalent fluorine-containing alkylene group having 1 to 40 carbon atoms, fluorine-containing oxyalkylene group having 1 to 40 carbon atoms, carbon number The fluorine-containing alkylene group containing a 1-40 ether bond or the fluorine-containing oxyalkylene group containing a C1-C40 ether bond is represented.

水酸基を有する含フッ素エチレン性単量体としては、より具体的には
CF2=CF−Rf 1−CH2OH
を挙げることができる。式中、Rf 1は炭素数1〜40の2価の含フッ素アルキレン基または−ORf 2、ただし、Rf 2は炭素数1〜40の2価の含フッ素アルキレン基または炭素数1〜40のエーテル結合を含む2価の含フッ素アルキレン基である。
また、CF2=CFCF2−ORf 3−CH2OH
を挙げることができる。式中、−Rf 3は炭素数1〜39の2価の含フッ素アルキレン基または炭素数1〜39のエーテル結合を含む2価の含フッ素アルキレン基を表わす。
また、CH2=CFCF2−Rf 4−CH2OH
を挙げることができる。式中、−Rf 4は炭素数1〜39の2価の含フッ素アルキレン基、または−ORf 5(Rf 5は炭素数1〜39の2価の含フッ素アルキレン基または炭素数1〜39のエーテル結合を含む2価の含フッ素アルキレン基)を表わす。
また、CH2=CH−Rf 6−CH2OH
を挙げることができる。式中、Rf 6は炭素数1〜40の2価の含フッ素アルキレン基である。
As the fluorine-containing ethylenic monomer having a hydroxyl group, more specifically,
CF 2 = CF-R f 1 -CH 2 OH
Can be mentioned. In the formula, R f 1 is a divalent fluorine-containing alkylene group having 1 to 40 carbon atoms or —OR f 2 , where R f 2 is a divalent fluorine-containing alkylene group having 1 to 40 carbon atoms or 1 to 1 carbon atoms. It is a divalent fluorine-containing alkylene group containing 40 ether bonds.
Also, CF 2 = CFCF 2 —OR f 3 —CH 2 OH
Can be mentioned. Wherein, -R f 3 represents a divalent fluorine-containing alkylene group containing an ether bond of the divalent fluorine-containing alkylene group or 1 to 39 carbon atoms to 39 carbon atoms.
In addition, CH 2 = CFCF 2 -R f 4 -CH 2 OH
Can be mentioned. Wherein, -R f 4 is a divalent fluorine-containing alkylene group or -OR f 5 (R f 5 is a divalent fluorine-containing alkylene group or from 1 to the number of carbon atoms of 1 to 39 carbon atoms, of 1 to 39 carbon atoms A divalent fluorine-containing alkylene group containing 39 ether bonds).
Further, CH 2 = CH-R f 6 -CH 2 OH
Can be mentioned. Wherein, R f 6 is a divalent fluorine-containing alkylene group having 1 to 40 carbon atoms.

一方、水酸基を含まない単量体としては、含フッ素エチレン性単量体、たとえばテトラフルオロエチレン、クロロトリフルオロエチレン、フッ化ビニル、ビニリデンフルオライド、ヘキサフルオロプロピレン、ヘキサフルオロイソブテン、パーフルオロ(アルキルビニルエーテル)類、CH2=CF−(CF2n−X、CH2=CH−(CF2n−X、(ただし、Xはいずれも水素原子、塩素原子またはフッ素原子、nは、いずれも1〜5の整数)が挙げられる。
水酸基を有する熱可塑性フッ素樹脂としては、テトラフルオロエチレンとパーフルオロアルキルビニルエーテルとの共重合体が好ましい。
On the other hand, the monomer containing no hydroxyl group includes fluorine-containing ethylenic monomers such as tetrafluoroethylene, chlorotrifluoroethylene, vinyl fluoride, vinylidene fluoride, hexafluoropropylene, hexafluoroisobutene, perfluoro (alkyl vinyl ethers), CH 2 = CF- (CF 2 ) n -X, CH 2 = CH- (CF 2) n -X, ( provided that both X represents a hydrogen atom, a chlorine atom or a fluorine atom, n is one And an integer of 1 to 5).
As the thermoplastic fluororesin having a hydroxyl group, a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether is preferable.

また、フィラーの熱可塑性フッ素樹脂への配合は、熱可塑性フッ素樹脂を溶融してフィラーを混合することができ、熱可塑性フッ素樹脂のペレットや粉末に所定量のフィラーを混合して、2軸あるいは単軸の押出機を用いて混合する方法や、高濃度のフィラーマスターバッチを予め作り、成形時に混合させる方法を用いることができる。
フィラーマスターバッチの調製に用いる熱可塑性フッ素樹脂には水酸基を含有しない熱可塑性フッ素樹脂を用いてもよい。
Also, the filler can be blended into the thermoplastic fluororesin by melting the thermoplastic fluororesin and mixing the filler, mixing a predetermined amount of filler into the thermoplastic fluororesin pellets or powder, A method of mixing using a single screw extruder or a method of preparing a high-concentration filler master batch in advance and mixing at the time of molding can be used.
A thermoplastic fluororesin that does not contain a hydroxyl group may be used as the thermoplastic fluororesin used for preparing the filler masterbatch.

本発明の熱可塑性フッ素樹脂からなる接着性フィルムは、合成樹脂フィルムの製造に利用されているフィルム成形方法が利用できる。例えば、Tダイ成形法、インフレーション成形法、インサイドマンドレル法、真空フオーマー成形法等によって成形することができる。   As the adhesive film made of the thermoplastic fluororesin of the present invention, a film forming method used for producing a synthetic resin film can be used. For example, it can be molded by a T-die molding method, an inflation molding method, an inside mandrel method, a vacuum foamer molding method, or the like.

以下に、実施例を示し、本発明を説明する。
実施例1
ペリレンレツド系有機顔料(BASF社製Paliogen Red K391 平均粒径0.3μm)1重量部、水酸基を有する熱可塑性フッ素樹脂(ダイキン工業製ネオフロンPFA RAP)99重量部を配合し、2軸押出成形機(テクノベル社製KZW20−25G)を使用して溶融混練した。
得られた混練原料を、直径40mm押出機の先端に600mm幅のTダイを取り付けたフィルム成形機で、厚さ30μmのフィルムを成形した。
得られた接着性フィルムの特性を以下の評価方法によって評価した。
The following examples illustrate the invention.
Example 1
1 part by weight of perylene red organic pigment (BASF Palogen Red K391 average particle size 0.3 μm) and 99 parts by weight of a thermoplastic fluororesin having a hydroxyl group (Neoflon PFA RAP manufactured by Daikin Industries) Melt-kneaded using KZW20-25G (Technobel).
The obtained kneaded raw material was formed into a film having a thickness of 30 μm with a film forming machine in which a T die having a width of 600 mm was attached to the tip of an extruder having a diameter of 40 mm.
The characteristics of the obtained adhesive film were evaluated by the following evaluation methods.

ゲル状物の評価方法
得られたフィルムを目視観察して、フィルム1m2 当たり1mm2以上の大きさのゲル状物の数を計測し、その結果を表1に示す。
接着強度および平面性の評価方法
E−ガラスからなる坪量24g/m2 ガラスクロスに、濃度60質量%のポリテトラフルオロエチレン(PTFE)ディスバージョンを含浸させて305℃において熱処理する操作を繰り返し行って、ポリテトラフルオロエチレン樹脂含浸率91%、厚さ120μmのプリプレグを作製し、得られたプリプリグの両面に、接着性フィルムを介して、厚さ18μmの圧延銅箔を、345℃、面圧2MPaで15分間加圧して接着させて銅張積層板を作製した。
次いで、JIS−C6481に規定する方法によって接着強度を測定し、その結果を表1に示す。
また、銅箔表面の平滑性を実体顕微鏡によって観察し、その結果を表1に示す。
Evaluation Method of Gel-like Material The obtained film was visually observed, the number of gel-like materials having a size of 1 mm 2 or more per 1 m 2 of the film was measured, and the results are shown in Table 1.
Evaluation Method of Adhesive Strength and Planarity E-Glass 24g / m 2 glass cloth made of glass is impregnated with polytetrafluoroethylene (PTFE) dispersion at a concentration of 60% by mass and heat treated at 305 ° C repeatedly. Then, a prepreg having a polytetrafluoroethylene resin impregnation rate of 91% and a thickness of 120 μm was produced, and a rolled copper foil having a thickness of 18 μm was applied to both sides of the obtained prepreg through an adhesive film at 345 ° C., a surface pressure. A copper-clad laminate was prepared by applying pressure at 2 MPa for 15 minutes and bonding.
Subsequently, adhesive strength was measured by the method prescribed | regulated to JIS-C6481, and the result is shown in Table 1.
Moreover, the smoothness of the copper foil surface was observed with a stereomicroscope, and the results are shown in Table 1.

実施例2
フィラーとして、焼成カオリン(イメリス ミネラルズ・ジャパン社製 PoleStar400 平均粒径0.5μm)2重量部、実施例1の熱可塑性フッ素樹脂98重量部に変えた点を除き実施例1と同様に接着性フィルムを作製し、実施例1と同様の方法で評価し、その結果を表1に示す。
Example 2
Adhesiveness as in Example 1 except that the filler was changed to 2 parts by weight of calcined kaolin (PoleStar400 average particle size 0.5 μm, manufactured by Imerizu Minerals Japan) and 98 parts by weight of the thermoplastic fluororesin of Example 1. Films were prepared and evaluated in the same manner as in Example 1, and the results are shown in Table 1.

実施例3
フィラーとして、酸化アルミニウム(シーアイ化成製 NanoTek 平均粒子径0.031μm)の0.5重量部、実施例1の熱可塑性フッ素樹脂99.5重量部とを配合した点を除き、実施例1と同様に接着性フィルムを作製し、実施例1と同様の方法で評価し、その結果を表1に示す。
Example 3
The same as Example 1 except that 0.5 part by weight of aluminum oxide (Chiai Kasei NanoTek average particle size 0.031 μm) and 99.5 parts by weight of the thermoplastic fluororesin of Example 1 were blended as fillers. An adhesive film was prepared and evaluated in the same manner as in Example 1, and the results are shown in Table 1.

実施例4
フィラーとして、酸化アルミニウム(日本アエロジル社製 AEROXIDE AluC 平均粒子径 0.013μm)2.5重量部、水酸基を有しない熱可塑性フッ素樹脂(旭硝子製 フルオンPFA 62XB)97.5重量部を2軸押出成形機(テクノベル社製KZW20−25G)を使用して溶融混練してフィラー含有マスターバッチを作製した。
Example 4
As the filler, biaxial extrusion molding of 2.5 parts by weight of aluminum oxide (AEROXIDE AluC average particle diameter 0.013 μm by Nippon Aerosil Co., Ltd.) and 97.5 parts by weight of a thermoplastic fluororesin having no hydroxyl group (Fullon PFA 62XB by Asahi Glass) A filler-containing masterbatch was prepared by melt-kneading using a machine (KZW20-25G manufactured by Technobel).

得られたマスターバッチと水酸基を有するフッ素樹脂(ダイキン工業社製ネオフロンRAP)とを、質量比で1:10の割合で混合し、先端にチューブダイとインサイドマンドレルを取り付けた直径30mmの押出機ホッパーに投入し、直径45mm、厚さ40μmのチューブを押出成形した。得られたチューブの一端を切り裂いて接着性フィルムを作製し、実施例1と同様の方法で評価し、その結果を表1に示す。   The obtained master batch and a fluororesin having a hydroxyl group (neoflon RAP manufactured by Daikin Industries, Ltd.) were mixed at a mass ratio of 1:10, and an extruder hopper having a diameter of 30 mm, having a tube die and an inside mandrel attached to the tip. And a tube having a diameter of 45 mm and a thickness of 40 μm was extruded. One end of the obtained tube was cut to produce an adhesive film, which was evaluated in the same manner as in Example 1. The results are shown in Table 1.

実施例5
実施例4で作製したフィラーマスターバッチと、水酸基を有する熱可塑性フッ素樹脂との配合比を1:50(質量比)に変更した点を除き、実施例1と同様に接着性フィルムを作製し、実施例1と同様の方法で評価し、その結果を表1に示す。
Example 5
An adhesive film was prepared in the same manner as in Example 1 except that the blending ratio of the filler masterbatch prepared in Example 4 and the thermoplastic fluororesin having a hydroxyl group was changed to 1:50 (mass ratio). Evaluation was performed in the same manner as in Example 1, and the results are shown in Table 1.

比較例1
フィラーを配合しない点を除き実施例1と同様に接着性フィルムを作製し、実施例1と同様の方法で評価し、その結果を表1に示す。
Comparative Example 1
An adhesive film was prepared in the same manner as in Example 1 except that the filler was not blended, and evaluated by the same method as in Example 1. The results are shown in Table 1.

(フッ素樹脂の分析)
実施例、比較例で用いたフッ素樹脂であるダイキン工業製ネオフロンPFA RAPについて厚さ100μmのフィルム状の試料1を作製して、赤外分光分析計(日本分光製FT/IR−4100)で吸収スペクトルを測定した。また、比較のために、水酸基を有さない熱可塑性フッ素樹脂である三井デュポンフロロケミカル製テフロン(登録商標)451HPJについても同様の試料2を作製して吸収スペクトルを測定した。その結果を図1に示す。試料1、試料2はいずれも、PFAからなるものであるが、試料1は、3640cm-1に水酸基を示す吸収が測定されたが、試料2には、そのような水酸基を示す吸収はなかった。
(Analysis of fluororesin)
A film-like sample 1 having a thickness of 100 μm was prepared for Neoflon PFA RAP made by Daikin Industries, which is a fluororesin used in Examples and Comparative Examples, and absorbed by an infrared spectrometer (FT / IR-4100 manufactured by JASCO Corporation). The spectrum was measured. For comparison, a similar sample 2 was prepared for Teflon (registered trademark) 451HPJ manufactured by Mitsui DuPont Fluorochemical, which is a thermoplastic fluororesin having no hydroxyl group, and the absorption spectrum was measured. The result is shown in FIG. Sample 1 and sample 2 are both made of PFA, but sample 1 was measured for absorption showing a hydroxyl group at 3640 cm −1 , but sample 2 did not have such absorption showing a hydroxyl group. .

表1
1mm 2 のゲル状物 銅箔剥離強度(N/cm) 銅箔表面状態
実施例1 なし 13N/cm 平滑
実施例2 なし 10N/cm 平滑
実施例3 なし 19N/cm 平滑
実施例4 なし 18N/cm 平滑
実施例5 なし 15N/cm 平滑
比較例 45個 15N/cm 突起状起伏
Table 1
1 mm 2 gelled material Copper foil peel strength (N / cm) Copper foil surface condition Example 1 None 13 N / cm Smooth Example 2 None 10 N / cm Smooth Example 3 None 19 N / cm Smooth Example 4 None 18N / cm Smooth Example 5 None 15N / cm Smooth Comparative Example 45 15N / cm Protruding undulation

本発明の接着性フィルムは、熱可塑性フッ素樹脂として水酸基含有フッ素樹脂を用いると共に所定の粒径のフィラーを配合したので、融点以上の温度において溶融混練した後に成形したフィルムには、粒径が大きなゲル状物の生成や、突起の生成を抑制することができるので、接着性が良好なホットメルト型の接着性フィルムを提供することができる。   Since the adhesive film of the present invention uses a hydroxyl group-containing fluororesin as a thermoplastic fluororesin and contains a filler having a predetermined particle diameter, the film formed after melt-kneading at a temperature equal to or higher than the melting point has a large particle diameter. Since the formation of gel-like materials and the formation of protrusions can be suppressed, a hot-melt adhesive film with good adhesion can be provided.

図1は、本発明の実施例に用いた水酸基を有する熱可塑性フッ素樹脂の赤外吸収スペクトルを説明する図である。FIG. 1 is a diagram illustrating an infrared absorption spectrum of a thermoplastic fluororesin having a hydroxyl group used in an example of the present invention.

Claims (2)

フッ素樹脂からなる接着性フィルムにおいて、フッ素樹脂が水酸基を有する熱可塑性フッ素樹脂100質量部に対して平均粒子径は5μm以下のペリレンレツド系有機顔料、焼成カオリン、酸化アルミニウムのいずれかをフィラーとして熱可塑性フッ素樹脂100重量部に対して0.001〜10質量部を配合して、融点以上の温度において溶融混練した後に成形したことを特徴とする接着性フィルム。 In an adhesive film made of a fluororesin, the thermoplastic resin is thermoplastic using any one of perylene red organic pigment, calcined kaolin, and aluminum oxide having an average particle size of 5 μm or less with respect to 100 parts by mass of the thermoplastic fluororesin having a hydroxyl group as the fluororesin . An adhesive film characterized by blending 0.001 to 10 parts by mass with respect to 100 parts by weight of a fluororesin, and molding after melt-kneading at a temperature equal to or higher than the melting point . 熱可塑性フッ素樹脂が水酸基を有するフッ素含有エチレン性単量体と、テトラフルオロエチレンおよびパーフルオロアルキルビニルエーテルとの共重合体であることを特徴とする請求項1記載のフッ素樹脂からなる接着性フィルム。 2. The adhesive film made of a fluororesin according to claim 1, wherein the thermoplastic fluororesin is a copolymer of a fluorine-containing ethylenic monomer having a hydroxyl group, tetrafluoroethylene and perfluoroalkyl vinyl ether.
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