JP3883764B2 - Laminated injection molded body and method for producing the same - Google Patents

Laminated injection molded body and method for producing the same Download PDF

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Publication number
JP3883764B2
JP3883764B2 JP33138699A JP33138699A JP3883764B2 JP 3883764 B2 JP3883764 B2 JP 3883764B2 JP 33138699 A JP33138699 A JP 33138699A JP 33138699 A JP33138699 A JP 33138699A JP 3883764 B2 JP3883764 B2 JP 3883764B2
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Prior art keywords
resin layer
synthetic resin
injection
laminated
soft synthetic
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JP2001150602A (en
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洋志 長江
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Mitsubishi Plastics Inc
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Mitsubishi Plastics Inc
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Priority to JP33138699A priority Critical patent/JP3883764B2/en
Priority to KR10-2002-7006506A priority patent/KR100480318B1/en
Priority to PCT/JP2000/008217 priority patent/WO2001039227A1/en
Priority to CNB008159769A priority patent/CN1168109C/en
Priority to TW089124735A priority patent/TW487632B/en
Publication of JP2001150602A publication Critical patent/JP2001150602A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/024—Packing between substrate and membrane
    • H01H2229/028—Adhesive
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/044—Injection moulding

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  • Push-Button Switches (AREA)
  • Laminated Bodies (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、軟質合成樹脂層が表面になるようにした積層射出成形体に関する。
【０００２】
【従来の技術】
近年、パーソナルコンピュータのキーボード、パームレスト、マウスなどの射出成形体の外表面を軟質合成樹脂層で覆うことにより、手触りを改良したり、滑り止め効果を改良することが要望されている。
【０００３】
また、電化製品のコントロールパネルやキーボードなどの射出成形体には、窓孔を形成し、その窓孔開口部をプラスチックフィルムで覆い、このプラスチックフィルムを指で押し込むことによりスイッチ操作を行うことができるようにしたものがあり、この場合も指で触る部分の手触りを柔らかく改良したり、滑り止め効果を改良することが要望されている。
【０００４】
これに対して、従来は予めプラスチックフィルムを成形用の金型内にセットし、この状態で樹脂を金型内に射出することにより、得られた射出成形体の表面にフィルムが積層された状態になるという、いわゆるフィルムインサート成形が提案され、表面側にポリエチレンテレフタレート樹脂やポリカーボネート樹脂などの基材層を配し、裏面側に接着剤層を配したフィルムを積層形成してなる積層射出成形体が提案されている。
【０００５】
【発明が解決しようとする課題】
しかしながら上記従来の積層射出成形体では、印刷処理を施したフィルムを用いることにより優れた表面概観を与えることができるという効果があるものの、表面側に現れる基材層はポリエチレンテレフタレート樹脂やポリカーボネート樹脂などの硬質樹脂を使用するものなので触感は硬めで比較的滑りやすいという嫌いがあり、表面の手触りをさらに柔らかく改良したり、滑り止め効果を付与することが望まれていた。
【０００６】
【課題を解決する手段】
本発明は、上記課題を解決せんとするもので、射出成形樹脂層の外表面に、軟質合成樹脂層と硬質合成樹脂層とを強固に接着してなる積層フィルムを、軟質合成樹脂層が表面になるように積層形成してなる積層射出成形体であり、このことにより、表面の手触りの柔らかい、しかも滑り止め効果に優れた射出成形樹脂層を得ることができる。
【０００７】
また本発明は、軟質合成樹脂層の一面に硬質合成樹脂を強固に接着し、前記軟質合成樹脂層の他面に保護層を剥離可能に積層してなる積層フィルムを、該積層フィルムの保護層面を型面に向けて射出成形型内にセットし、前記積層フィルムの硬質樹脂層側に射出成形して合成樹脂層を形成することを特徴とする積層射出成形体の製造方法に関するものであり、この事により、硬質合成樹脂層の剛性により積層フィルム全体の取扱がやりやすく、軟質合成樹脂層に傷をつけたりする恐れもなく、表面の手触りの柔らかい、しかも滑り止め効果に優れた射出成形樹脂層を得ることができる。
【０００８】
【発明の実施の態様】
以下、本発明を図面に基づいて詳細に説明する。
【０００９】
図１は本発明の積層射出成形体の一例を示す概略の正面断面図、図２は本発明の積層射出成形体の製造方法の一例を説明するための概略の正面断面図である。
【００１０】
本発明は、図１に示すように射出成形樹脂層１の外表面に、軟質合成樹脂層２１と硬質合成樹脂層２２とを強固に接着してなる積層フィルム２を、軟質合成樹脂層２１が表面になるように積層形成してなる積層射出成形体である。
【００１１】
本発明において射出成形樹脂層１としては、ハイインパクトポリスチレン樹脂、アクリロニトリル−ブタジエン−スチレン共重合体樹脂、アクリロニトリル−スチレン共重合体樹脂などの樹脂を、射出成形して得られるものである。
【００１２】
本発明において軟質合成樹脂層２１としては、ゴム弾性を有し、滑りにくい樹脂であればよいが、耐久性や外観の点から材料形態としてはシリコーンゴムが好適である。シリコーンゴムとしてはジメチルシロキサンを主なモノマー成分としたポリジメチルシロキサンを主成分とした組成物からなる電子線架橋型シリコーンゴム、ミラブル型シリコーンゴム、液状硬化型シリコーンゴム等のゴムが好ましい。
【００１３】
ジメチルシロキサンを主なモノマー成分としたポリジメチルシロキサンにおける他のモノマー成分としては、メチル基のひとつないしは二つ（末端についてはひとつないしは三つ）をビニル基、フェニル基、（長鎖）アルキル基、フルオロアルキル基、ヒドロキシル基（＝シラノール基）、アミノ基、グリシジル基、アルコキシ基、塩素、水素等で置換したモノマーが応用できる。
【００１４】
シリコーン単独では成しえない特性例えば加工性、耐熱性、機械物性、接着性、難燃性、信頼性等を補助する目的でポリジメチルシロキサン以外の充填材、加硫剤、特性向上剤などの成分を添加してもよい。
【００１５】
充填材としてはシリカ、けいそう土、石英粉、炭酸カルシウム、シリコーンレジン、カーボン等が用いられる。また加硫剤としては有機過酸化物、変性シラン、変性シロキサン、アルコキシシラン、白金化合物等が用いられ、硬化性の調整のため反応抑制剤としてアセチレンアルコール、環状メチルビニルシロキサン等が用いられる。また特性向上剤としては末端シラノール基あるいは末端アルコキシ基含有低粘度シリコーンオイル・シリコーンレジン、シラン化合物（以上加工助剤）、鉄、ニッケル等の金属酸化物、金属有機酸塩（以上耐熱向上剤）酸化カルシウム、酸化バリウム等の酸受容体（以上加硫戻り防止剤）白金化合物、酸化鉄、酸化チタン、カーボン（以上難燃性付与剤）シランカップリング剤（以上接着向上剤）等が用いられる。
【００１６】
この軟質合成樹脂層２１の厚さとしては、３０〜５００μｍが好ましく使用できる。３０μｍ未満では滑り止め効果はあるが幾分柔らかさが不十分であり、５００μｍを越えると、材料コストが上昇する嫌いがある。
【００１７】
本発明において、硬質合成樹脂層２２としては、ポリエチレンテレフタレート、ポリプロピレン、ポリスチレンなどの二軸延伸フィルムを使用することができ、中でもポリエチレンテレフタレートの二軸延伸フィルムが強度が大きいとともに、剛性が高くてスイッチに使用したときのクリック感や復元力に富むことから最も好ましい。
【００１８】
また本発明は図２に示すように、軟質合成樹脂層２１の一面に硬質合成樹脂層２２を強固に接着し、前記軟質合成樹脂層２１の他面に保護層２３を剥離可能に積層してなる積層フィルム２０を、該積層フィルム２０の保護層２３面を型面４０に向けて射出成形型内４にセットし、前記積層フィルム２０の硬質合成樹脂層２２側に射出成形して射出成形樹脂層１を形成することを特徴とする積層射出成形体の製造方法である。
【００１９】
軟質合成樹脂層２１の一面に硬質合成樹脂層２２を強固に接着し、他面に保護層２３を剥離可能に積層するためには、例えば、硬質合成樹脂層２２としては例えば厚さ１２μｍのポリエチレンテレフタレートの二軸延伸フィルムに、ポリウレタン系樹脂あるいは非晶性ポリエステル系樹脂を主成分とする接着性下塗り剤を塗布乾燥し、これに未架橋状態の電子線架橋型シリコーン樹脂を積層し、この未架橋状態のシリコーン樹脂の表面にさらにポリエチレンテレフタレートの二軸延伸フィルムなどからなる保護層２３を圧着し、その後電子線照射して前記シリコーン樹脂を架橋硬化させてシリコーンゴムからなる軟質合成樹脂層２１を有する積層フィルム２０を得ることができる。
【００２０】
保護層２３は剥離可能であればよいが、好ましい剥離強度としては、２０℃の温度下で軟質合成樹脂層２１を固定した状態で、保護層２３を軟質合成樹脂層２１と直角な方向に剥離速度３００ｍｍ／分で剥離する、いわゆるＴ型剥離試験を行ったとき、３０〜５００ｇｆ／５０ｍｍ幅が採用できる。
【００２１】
こうして得られた積層フィルム２０を射出成形型４内にセットするのであるが、このとき積層フィルム２０の保護層２３面を型面４０に向けてセットして、前記積層フィルム２０の硬質合成樹脂層２２側に射出成形して射出成形樹脂層１を形成する事により、成形と同時に前記射出成形樹脂層１が前記硬質合成樹脂層２２に強固に融着した積層射出成形体が得られる。
【００２２】
得られた積層射出成形体の最外面に位置する保護層２３を剥離すれば、表面に軟質合成樹脂層２１が露出し、表面の手触りの柔らかい、しかも滑り止め効果に優れた積層射出成形体を得ることができる。
【００２３】
また、保護層２３面を型面４０に向けてセットするので、軟質合成樹脂層２１が保護され傷つきにくいという利点がある。
【００２４】
この時、射出成形型４の射出側４１に開孔用突部４２を形成しておき、この部分において射出成形樹脂層１が硬質合成樹脂層２２に接触しないようにしておけば、得られる積層射出成形体は射出成形樹脂層１に開孔部１０が形成されるがその開口は積層フィルム２０により閉止された状態で成形されるため、表面から積層フィルム２０を押し込んでスイッチを操作したり、光電などによる表示をしたりでき、また開孔部は密閉されるので水や埃が浸入しないという利点があるので、コンピュータのキーボードや家電の操作板に効果的に使用できる。
【００２５】
なお、本発明において保護層２３としてはポリエチレンテレフタレート、ポリプロピレン、ポリスチレンなどの硬質合成樹脂からなる二軸延伸フィルムや、ポリエチレン、エチレン−酢酸ビニル共重合体などの半硬質質合成樹脂あるいは紙の表面をシリコーン系、フッ素系などの剥離材をコーティングしたもの等が用いられるが、軟質合成樹脂層に対する適当な剥離強度の点から、ポリエチレンテレフタレート、ポリプロピレン、ポリスチレンなどの硬質合成樹脂からなる二軸延伸フィルムが好ましく、中でもポリエチレンテレフタレート二軸延伸フィルムが好ましい。
【００２６】
【発明の効果】
本発明は、射出成形樹脂層の外表面に、軟質合成樹脂層と硬質合成樹脂層とを強固に接着してなる積層フィルムを、軟質合成樹脂層が表面になるように積層形成してなる積層射出成形体であるので、表面の手触りの柔らかい、しかも滑り止め効果に優れた射出成形樹脂層を得ることができる。
【００２７】
また、軟質合成樹脂層の一面に硬質合成樹脂を強固に接着し、前記軟質合成樹脂層の他面に保護層を剥離可能に積層してなる積層フィルムを、該積層フィルムの保護層面を型面に向けて射出成形型内にセットし、前記積層フィルムの硬質樹脂層側に射出成形して射出成形樹脂層を形成することを特徴とする積層射出成形体の製造方法であるので、軟質合成樹脂層に傷をつけたりする恐れもなく、表面の手触りの柔らかい、しかも滑り止め効果に優れた射出成形樹脂層を得ることができる。
【００２８】
【実施例】
以下実施例を挙げて詳細に説明する。
【００２９】
まず、硬質合成樹脂層２２としては、厚さ１２μｍのポリエチレンテレフタレートの二軸延伸フィルムに、ポリウレタン系樹脂を主成分とする接着性下塗り剤を塗布乾燥したものを準備し、さらに保護層２３としては、処理をしていない厚さ１２μｍのポリエチレンテレフタレートの二軸延伸フィルムを準備した。
【００３０】
準備した２枚のフィルムの間に、未架橋状態の電子線架橋型シリコーン樹脂を挟み込みながら、全体を１対の圧延ロールの間で挟みながら、シリコーン樹脂の厚さが２００μｍになるように圧延し、その後電子線照射して前記シリコーン樹脂を架橋硬化させてシリコーンゴムからなる軟質合成樹脂層２１を有する積層フィルム２０を得た。
【００３１】
次いで、得られた積層フィルム２０をプレス成形して、スイッチに相当する部分に小凸部２０１等を備えた所定形状に成形した。このときプレス成形型により圧縮されるにもかかわらず、軟質合成樹脂層２１は保護層２３に覆われているので、この軟質合成樹脂層２１に傷がついたりしないという利点があった。
【００３２】
さらに、プレス成形した積層フィルム２０を図２に示す射出成形型４内に、保護層２３面を型面４０に向けてセットして、射出側型４１を閉じ、図示しない押し出し機から溶融したアクリロニトリル−スチレン樹脂を、射出孔４１１を通して射出し、前記積層フィルム２０の硬質合成樹脂層２２側に射出成形し、冷却する。
【００３３】
そうするとアクリロニトリル−スチレン樹脂が前記硬質合成樹脂層２２に強固に融着するとともに、冷却固化して射出成形樹脂層１を形成する事により、積層射出成形体が得られる。
【００３４】
また、保護層２３面を型面４０に向けてセットするので、この射出成形工程においても、軟質合成樹脂層２１が保護され傷つきにくいという利点がある。
【００３５】
得られた積層射出成形体の最外面に位置する保護層２３を剥離すれば、表面に軟質合成樹脂層２１が露出し、図１に示すように射出成形樹脂層１の外表面に、軟質合成樹脂層２１と硬質合成樹脂層２２とを強固に接着してなる積層フィルム２を、軟質合成樹脂層２１が表面になるように積層形成してなる積層射出成形体が得られ、表面の手触りの柔らかい、しかも滑り止め効果に優れた射出成形樹脂層を得ることができる。
【００３６】
さらにこの時、射出成形型４の射出側４１に開孔用突部４２を形成しておき、この部分において射出成形樹脂層１が硬質合成樹脂層２２に接触しないようにしておけば、得られる積層射出成形体は射出成形樹脂層１に開孔部１０が形成されるがその開口は積層フィルム２０により閉止された状態で成形されるため、表面から積層フィルム２０を押し込んでスイッチを操作したり、光電などによる表示をしたりでき、また開孔部は密閉されるので水や埃が浸入しないという利点があるので、コンピュータのキーボードや家電の操作板に効果的に使用できる。
【図面の簡単な説明】
【図１】本発明の積層射出成形体の一例を示す概略の正面断面図。
【図２】本発明の積層射出成形体の製造方法の一例を説明するための概略の正面断面図。
【符号の説明】
１ 射出成形樹脂層
２ 積層フィルム
２０ 積層フィルム
２１ 軟質合成樹脂層
２２ 硬質合成樹脂層
２３ 保護層
４ 射出成形型
４０ 型面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a laminated injection molded article having a soft synthetic resin layer on the surface.
[0002]
[Prior art]
In recent years, it has been demanded to improve the touch and the anti-slip effect by covering the outer surface of an injection-molded body such as a keyboard, palm rest, and mouse of a personal computer with a soft synthetic resin layer.
[0003]
In addition, it is possible to perform a switch operation by forming a window hole in an injection molded body such as a control panel of an electric appliance or a keyboard, covering the opening of the window hole with a plastic film, and pressing the plastic film with a finger. In this case as well, there is a demand for softly improving the touch of the part touched by a finger and improving the anti-slip effect.
[0004]
In contrast, conventionally, a plastic film is set in a mold for molding in advance, and the resin is injected into the mold in this state, so that the film is laminated on the surface of the obtained injection molded body. A so-called film insert molding is proposed, and a laminated injection molded product in which a base material layer such as polyethylene terephthalate resin or polycarbonate resin is arranged on the front side and an adhesive layer is arranged on the back side is laminated. Has been proposed.
[0005]
[Problems to be solved by the invention]
However, the conventional laminated injection molded article has an effect that an excellent surface appearance can be given by using a film subjected to printing treatment, but the base material layer appearing on the surface side is polyethylene terephthalate resin, polycarbonate resin, etc. Therefore, there is a dislike that the feel is hard and relatively slippery, and it has been desired to improve the touch of the surface more softly and to provide an anti-slip effect.
[0006]
[Means for solving the problems]
The present invention is to solve the above-mentioned problems. A laminated film formed by firmly bonding a soft synthetic resin layer and a hard synthetic resin layer to the outer surface of an injection molded resin layer is provided on the surface of the soft synthetic resin layer. Thus, it is possible to obtain an injection-molded resin layer that is soft to the surface and has an excellent anti-slip effect.
[0007]
Further, the present invention provides a laminated film obtained by firmly bonding a hard synthetic resin to one surface of a soft synthetic resin layer and laminating a protective layer on the other surface of the soft synthetic resin layer in a peelable manner. Is set in an injection mold toward the mold surface, and relates to a method for producing a laminated injection-molded article, characterized in that a synthetic resin layer is formed by injection molding on the hard resin layer side of the laminated film, This makes it easy to handle the entire laminated film due to the rigidity of the hard synthetic resin layer, there is no risk of scratching the soft synthetic resin layer, the surface is soft, and the injection molded resin layer has an excellent anti-slip effect. Can be obtained.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings.
[0009]
FIG. 1 is a schematic front sectional view showing an example of the laminated injection-molded article of the present invention, and FIG. 2 is a schematic front sectional view for explaining an example of the method for producing the laminated injection-molded article of the present invention.
[0010]
In the present invention, as shown in FIG. 1, a laminated film 2 formed by firmly bonding a soft synthetic resin layer 21 and a hard synthetic resin layer 22 to the outer surface of an injection molded resin layer 1 It is a laminated injection molded body formed by laminating so as to be on the surface.
[0011]
In the present invention, the injection-molded resin layer 1 is obtained by injection molding a resin such as a high-impact polystyrene resin, acrylonitrile-butadiene-styrene copolymer resin, acrylonitrile-styrene copolymer resin.
[0012]
In the present invention, the soft synthetic resin layer 21 may be any resin that has rubber elasticity and is not slippery. Silicone rubber is preferable as a material form from the viewpoint of durability and appearance. The silicone rubber is preferably a rubber such as an electron beam cross-linking silicone rubber, a millable silicone rubber, or a liquid curable silicone rubber comprising a composition containing polydimethylsiloxane as a main component and containing dimethylsiloxane as a main monomer component.
[0013]
Other monomer components in polydimethylsiloxane containing dimethylsiloxane as the main monomer component include one or two methyl groups (one or three at the end) as vinyl groups, phenyl groups, (long chain) alkyl groups, A monomer substituted with a fluoroalkyl group, a hydroxyl group (= silanol group), an amino group, a glycidyl group, an alkoxy group, chlorine, hydrogen or the like can be applied.
[0014]
Properties that cannot be achieved with silicone alone, such as fillers, vulcanizing agents, and property improvers other than polydimethylsiloxane for the purpose of assisting processability, heat resistance, mechanical properties, adhesiveness, flame retardancy, reliability, etc. Ingredients may be added.
[0015]
Silica, diatomaceous earth, quartz powder, calcium carbonate, silicone resin, carbon, etc. are used as the filler. Further, organic peroxides, modified silanes, modified siloxanes, alkoxysilanes, platinum compounds and the like are used as vulcanizing agents, and acetylene alcohol, cyclic methylvinylsiloxane and the like are used as reaction inhibitors for adjusting curability. In addition, as a property improver, terminal silanol group or terminal alkoxy group-containing low viscosity silicone oil / silicone resin, silane compound (above processing aid), metal oxide such as iron and nickel, metal organic acid salt (above heat resistance improver) Acid acceptors such as calcium oxide and barium oxide (more anti-reversion agent) platinum compounds, iron oxide, titanium oxide, carbon (more flame retardant), silane coupling agents (more adhesion improvers), etc. are used. .
[0016]
As thickness of this soft synthetic resin layer 21, 30-500 micrometers can be used preferably. If it is less than 30 μm, there is an anti-slip effect, but the softness is somewhat insufficient, and if it exceeds 500 μm, there is a dislike that the material cost increases.
[0017]
In the present invention, a biaxially stretched film such as polyethylene terephthalate, polypropylene, or polystyrene can be used as the hard synthetic resin layer 22. Among them, the biaxially stretched film of polyethylene terephthalate has high strength and high rigidity, so that the switch It is most preferable because it has a good click feeling and a restoring force when used.
[0018]
In the present invention, as shown in FIG. 2, a hard synthetic resin layer 22 is firmly bonded to one surface of a soft synthetic resin layer 21, and a protective layer 23 is peelably laminated on the other surface of the soft synthetic resin layer 21. The laminated film 20 is set in the injection mold 4 with the surface of the protective layer 23 of the laminated film 20 facing the mold surface 40, and injection-molded on the hard synthetic resin layer 22 side of the laminated film 20. It is a method for producing a laminated injection-molded product, wherein the layer 1 is formed.
[0019]
In order to firmly bond the hard synthetic resin layer 22 to one surface of the soft synthetic resin layer 21 and to laminate the protective layer 23 to the other surface in a peelable manner, for example, the hard synthetic resin layer 22 has a thickness of 12 μm, for example. A biaxially stretched film of terephthalate is coated with an adhesive primer mainly composed of a polyurethane resin or an amorphous polyester resin and dried, and an uncrosslinked electron beam crosslinked silicone resin is laminated thereon. A protective layer 23 composed of a biaxially stretched film of polyethylene terephthalate or the like is further pressure-bonded to the surface of the crosslinked silicone resin, and then the silicone resin is crosslinked and cured by irradiation with an electron beam to form a soft synthetic resin layer 21 composed of silicone rubber. The laminated film 20 can be obtained.
[0020]
The protective layer 23 only needs to be peelable, but a preferable peel strength is that the protective layer 23 is peeled in a direction perpendicular to the soft synthetic resin layer 21 with the soft synthetic resin layer 21 fixed at a temperature of 20 ° C. When a so-called T-type peel test is performed to peel at a speed of 300 mm / min, a width of 30 to 500 gf / 50 mm can be employed.
[0021]
The laminated film 20 thus obtained is set in the injection mold 4. At this time, the protective film 23 side of the laminated film 20 is set facing the mold surface 40, and the hard synthetic resin layer of the laminated film 20 is set. By forming the injection-molded resin layer 1 by injection molding on the 22 side, a laminated injection-molded body in which the injection-molded resin layer 1 is firmly fused to the hard synthetic resin layer 22 simultaneously with molding is obtained.
[0022]
When the protective layer 23 located on the outermost surface of the obtained laminated injection molded article is peeled off, the laminated synthetic resin layer 21 is exposed on the surface, the surface is soft to the touch, and the laminated injection molded article excellent in the anti-slip effect is obtained. Obtainable.
[0023]
Further, since the surface of the protective layer 23 is set toward the mold surface 40, there is an advantage that the soft synthetic resin layer 21 is protected and hardly damaged.
[0024]
At this time, if an opening protrusion 42 is formed on the injection side 41 of the injection mold 4 and the injection molded resin layer 1 is not in contact with the hard synthetic resin layer 22 in this portion, the resulting laminate is obtained. The injection-molded body is formed with the opening 10 formed in the injection-molded resin layer 1 but the opening is closed by the laminated film 20, so that the laminated film 20 is pushed from the surface and the switch is operated, The display can be displayed by photoelectric and the like, and since the opening is sealed, there is an advantage that water and dust do not enter, so that it can be effectively used for a computer keyboard and an operation panel of home appliances.
[0025]
In the present invention, the protective layer 23 is a biaxially stretched film made of a hard synthetic resin such as polyethylene terephthalate, polypropylene or polystyrene, or a semi-rigid synthetic resin such as polyethylene or ethylene-vinyl acetate copolymer, or the surface of paper. A film coated with a release material such as silicone or fluorine is used. From the viewpoint of appropriate peel strength for a soft synthetic resin layer, a biaxially stretched film made of a hard synthetic resin such as polyethylene terephthalate, polypropylene, or polystyrene is used. Among them, a polyethylene terephthalate biaxially stretched film is preferable.
[0026]
【The invention's effect】
The present invention provides a laminate film formed by laminating a soft synthetic resin layer and a hard synthetic resin layer firmly on the outer surface of an injection molded resin layer so that the soft synthetic resin layer is on the surface. Since it is an injection-molded body, it is possible to obtain an injection-molded resin layer having a soft surface and excellent anti-slip effect.
[0027]
Also, a laminated film formed by firmly bonding a hard synthetic resin to one surface of the soft synthetic resin layer and laminating the protective layer on the other surface of the soft synthetic resin layer so that the protective layer can be peeled off is used. The method is a method for producing a laminated injection-molded body, characterized in that it is set in an injection mold toward the hard mold layer side of the laminated film to form an injection-molded resin layer. There is no fear of scratching the layer, and it is possible to obtain an injection-molded resin layer that is soft to the surface and has an excellent anti-slip effect.
[0028]
【Example】
Examples will be described in detail below.
[0029]
First, as the hard synthetic resin layer 22, a 12-μm thick polyethylene terephthalate biaxially stretched film prepared by applying and drying an adhesive primer mainly composed of a polyurethane resin, and the protective layer 23 is further prepared. An untreated biaxially stretched polyethylene terephthalate film having a thickness of 12 μm was prepared.
[0030]
While the uncrosslinked electron beam cross-linked silicone resin is sandwiched between the two prepared films, the whole is sandwiched between a pair of rolling rolls and rolled to a thickness of 200 μm. Then, the laminated film 20 having the soft synthetic resin layer 21 made of silicone rubber was obtained by crosslinking and curing the silicone resin by electron beam irradiation.
[0031]
Next, the obtained laminated film 20 was press-molded and formed into a predetermined shape including a small convex portion 201 and the like in a portion corresponding to the switch. At this time, although the soft synthetic resin layer 21 is covered with the protective layer 23 in spite of being compressed by the press mold, there is an advantage that the soft synthetic resin layer 21 is not damaged.
[0032]
Furthermore, the press-molded laminated film 20 is set in the injection mold 4 shown in FIG. 2 with the protective layer 23 surface facing the mold surface 40, the injection side mold 41 is closed, and acrylonitrile melted from an extruder (not shown). -Styrene resin is injected through the injection hole 411, injection-molded on the hard synthetic resin layer 22 side of the laminated film 20, and cooled.
[0033]
Then, the acrylonitrile-styrene resin is firmly fused to the hard synthetic resin layer 22 and is cooled and solidified to form the injection-molded resin layer 1, thereby obtaining a laminated injection-molded product.
[0034]
Further, since the surface of the protective layer 23 is set toward the mold surface 40, there is an advantage that the soft synthetic resin layer 21 is protected and hardly damaged in this injection molding process.
[0035]
If the protective layer 23 located on the outermost surface of the obtained laminated injection molded body is peeled off, the soft synthetic resin layer 21 is exposed on the surface, and the soft synthetic resin layer 1 is exposed on the outer surface of the injection molded resin layer 1 as shown in FIG. A laminated injection molded body is obtained by laminating the laminated film 2 formed by firmly bonding the resin layer 21 and the hard synthetic resin layer 22 so that the soft synthetic resin layer 21 is on the surface. An injection molded resin layer that is soft and has an excellent anti-slip effect can be obtained.
[0036]
Further, at this time, if an opening protrusion 42 is formed on the injection side 41 of the injection mold 4 and the injection molding resin layer 1 is not in contact with the hard synthetic resin layer 22 at this portion, the resin can be obtained. The laminated injection-molded body is formed with the opening 10 formed in the injection-molded resin layer 1 but the opening is closed by the laminated film 20, so that the laminated film 20 is pushed from the surface to operate the switch. In addition, since it is possible to display by photoelectric etc. and the opening is sealed, there is an advantage that water and dust do not enter, so that it can be effectively used for a computer keyboard and an operation panel of home appliances.
[Brief description of the drawings]
FIG. 1 is a schematic front sectional view showing an example of a laminated injection molded article of the present invention.
FIG. 2 is a schematic front cross-sectional view for explaining an example of a method for producing a laminated injection molded body of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Injection molding resin layer 2 Laminated film 20 Laminated film 21 Soft synthetic resin layer 22 Hard synthetic resin layer 23 Protective layer 4 Injection mold 40 Mold surface

Claims (2)

ハイインパクトポリスチレン樹脂、アクリロニトリル−ブタジエン−スチレン共重合体樹脂、アクリロニトリル−スチレン共重合体樹脂から選ばれた樹脂からなる射出成形樹脂層の外表面に、シリコーンゴムからなる軟質合成樹脂層と硬質合成樹脂層とを強固に接着してなる積層フィルムを、軟質合成樹脂層が表面になるように積層形成してなる積層射出成形体。 A soft synthetic resin layer made of silicone rubber and a hard synthetic resin on the outer surface of an injection molded resin layer made of a resin selected from high impact polystyrene resin, acrylonitrile-butadiene-styrene copolymer resin, and acrylonitrile-styrene copolymer resin A laminated injection-molded product obtained by laminating a laminated film formed by firmly adhering layers to each other so that a soft synthetic resin layer is on the surface. シリコーンゴムからなる軟質合成樹脂層の一面に硬質合成樹脂を強固に接着し、前記軟質合成樹脂層の他面に保護層を剥離可能に積層してなる積層フィルムを、該積層フィルムの保護層面を型面に向けて射出成形型内にセットし、前記積層フィルムの硬質樹脂層側にハイインパクトポリスチレン樹脂、アクリロニトリル−ブタジエン−スチレン共重合体樹脂、アクリロニトリル−スチレン共重合体樹脂から選ばれた樹脂を射出成形して合成樹脂層を形成することを特徴とする積層射出成形体の製造方法。A laminated film formed by firmly adhering a hard synthetic resin to one side of a soft synthetic resin layer made of silicone rubber and laminating a protective layer on the other side of the soft synthetic resin layer so that the protective layer can be peeled off. A resin selected from high impact polystyrene resin, acrylonitrile-butadiene-styrene copolymer resin, and acrylonitrile-styrene copolymer resin is placed on the hard resin layer side of the laminated film toward the mold surface. A method for producing a laminated injection-molded article, wherein a synthetic resin layer is formed by injection molding.
JP33138699A 1999-11-22 1999-11-22 Laminated injection molded body and method for producing the same Expired - Lifetime JP3883764B2 (en)

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JP33138699A JP3883764B2 (en) 1999-11-22 1999-11-22 Laminated injection molded body and method for producing the same
KR10-2002-7006506A KR100480318B1 (en) 1999-11-22 2000-11-21 Laminated Shaped Article and Method For Producing the Same
PCT/JP2000/008217 WO2001039227A1 (en) 1999-11-22 2000-11-21 Laminate and method for producing the same
CNB008159769A CN1168109C (en) 1999-11-22 2000-11-21 laminate and method for producing the same
TW089124735A TW487632B (en) 1999-11-22 2001-01-18 Laminated shaped article and method for producing the same

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JP5297101B2 (en) * 2008-06-24 2013-09-25 東洋紡株式会社 Resin composite
JP5226411B2 (en) * 2008-07-18 2013-07-03 東洋紡株式会社 Laminated polyester film for skin material and composite molded body with improved tactile sensation using the same
JP5297180B2 (en) * 2008-12-22 2013-09-25 東洋紡株式会社 Laminated polyester film for skin material and composite molded body with improved tactile sensation using the same
TWI643224B (en) * 2017-08-22 2018-12-01 達方電子股份有限公司 Keyswitch and keyboard including such keyswitch

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CN1168109C (en) 2004-09-22
KR20020065528A (en) 2002-08-13

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