JP4357795B2 - Transfer sheet for simultaneous painting with injection molding and molded product with painting - Google Patents

Transfer sheet for simultaneous painting with injection molding and molded product with painting Download PDF

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Publication number
JP4357795B2
JP4357795B2 JP2002121968A JP2002121968A JP4357795B2 JP 4357795 B2 JP4357795 B2 JP 4357795B2 JP 2002121968 A JP2002121968 A JP 2002121968A JP 2002121968 A JP2002121968 A JP 2002121968A JP 4357795 B2 JP4357795 B2 JP 4357795B2
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layer
resin
sheet
transfer
pattern
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JP2002121968A
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JP2003311779A (en
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玄 竹内
治雄 宮下
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Dai Nippon Printing Co Ltd
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Dai Nippon Printing Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、射出成形同時絵付に使用する転写シートと、該転写シートを用いて得られる絵付成形品に関する。特に、表面凹凸と塗装感と共に耐スクラッチ性も良好となる転写シートと、それを用いて得られる絵付成形品に関する。
【0002】
【従来の技術】
樹脂成形物の表面を絵付シートによって絵付した絵付成形品は各種用途で使用されている。この様な絵付成形品を得る代表的な方法として、射出成形同時絵付方法(特公昭50−19132号公報、特公昭43−27488号公報、特開平6−315950号公報、特公平2−42080号公報、等参照)がある。この射出成形同時絵付には、大別して、ラミネート形態と転写形態とがある。ラミネート形態では、絵付シートの全層を樹脂成形物の表面に積層する。また、転写形態では、絵付シートとして、支持体シート上に転写層を積層した構成の転写シートを用いて、転写シート全層を一旦樹脂成形物表面に積層した後、支持体シートを剥離して、最終的に転写層のみを樹脂成形物表面に積層する。
【0003】
また、絵付成形品の表面に例えば木目導管溝模様等の凹凸模様を設ける場合には、ラミネート形態の場合では、例えば、射出成形型のキャビティ面に賦形用の凹凸模様を設けておいて、射出成形時に絵付シート表面に凹凸模様を賦形することで対応できる。一方、転写形態の場合では、上記ラミネート形態の場合と同様に、射出成形型のキャビティ面に金属加工等によって賦形用の凹凸模様を設けておき、転写シートの支持体シートを通して転写層表面に凹凸模様を賦形する場合と、転写シートの支持体シートの転写層側の面を凹凸模様賦形層等で凹凸面として、支持体シートから転写層に凹凸模様を賦形する場合とがある。
一方、塗装感を得る為には、転写形態では厚い透明樹脂層を形成し難い為に、ラミネート形態として、その絵付シートの基材シートには成形性等と共に透明性に優れたアクリル樹脂による透明樹脂シートを使用して、その裏面側に設けた絵柄層に対する塗装感を得る場合が多い。
また、印刷等で形成した絵柄層に対する耐摩耗性を得る場合には、転写形態では厚みを厚くできない為に、ラミネート形態として、透明樹脂シートの裏面側に絵柄層を形成して透明樹脂シートで絵柄層を保護するのが、性能的に優れたものとなる。
【0004】
【発明が解決しようとする課題】
しかしながら、凹凸模様と共に塗装感も得る場合、上記の如きラミネート形態では塗装感の方は良いが凹凸模様の点で難があり、転写形態では凹凸模様の方は良いが塗装感の点で難がある。しかも、ラミネート形態では、成形性、透明性等を考慮した場合、アクリル樹脂シートが主となるが、アクリル樹脂シートは耐擦傷性に関しては、あまり芳しくない。この耐擦傷性に関しては、ポリカーボネート樹脂シート等、耐擦傷性に優れたシートは有るが、成形性(加工安定性)、コスト等に難があった。
【0005】
すなわち、本発明の課題は、凹凸模様、塗装感、及び耐摩耗性の全てを満たせる射出成形同時絵付技術を提供することである。そして、その為の射出成形同時絵付用転写シート、及びそれによって得られる絵付成形品を提供することである。
【0006】
【課題を解決するための手段】
そこで、上記課題を解決すべく、本発明では次の如き転写形態で使用する転写シートと、それを用いて得られる絵付成形品を提供する。すなわち、本発明の射出成形同時絵付用転写シートは、転写層側に凹凸模様賦形層を有する支持体シートに、転写層として順次、剥離層、補強層、接着層、透明アクリル樹脂シート、絵柄層、接着剤層が積層されてなる射出成形同時絵付用転写シートであって、上記補強層に無機又は有機の粉末充填剤が添加されており、該補強層がアクリル樹脂をシランカップリング剤で硬化させる2液硬化型アクリル樹脂の硬化物からなり、かつ、透明な層で形成され、前記絵柄層を透視可能であり、かつ、前記接着層が熱融着性を有する、酢酸ビニル樹脂、塩化ビニル−酢酸ビニル共重合体、アクリル樹脂、熱可塑性ポリエステル樹脂、ポリアミド樹脂、アイオノマー、塩素化ポリオレフィンの熱可塑性樹脂であることを特徴とする構成とした。
【0007】
この様な構成とすることで、凹凸模様を付与できる上、透明アクリル樹脂シートによって塗装感も得られ、しかも転写後は該透明アクリル樹脂シートの表面側に位置する事になる特定材料からなる補強層によって、耐摩耗性も得られる。従って、凹凸模様付与、塗装感、及び耐擦傷性の全てを満足させることができる。
【0008】
また、本発明の絵付成形品は、上記の射出成形同時絵付用転写シートの転写により、該転写シートの転写層が樹脂成形物の表面に積層されてなる構成の成形品とした。
【0009】
この様な構成とすることで、前記した射出成形同時絵付用転写シートによる効果が得られる。従って、その結果、凹凸模様付与、塗装感、及び耐擦傷性の全てを絵付成形品に付与できる様になる。
【0010】
【発明の実施の形態】
以下、図面を参照しながら本発明の実施の形態を説明する。
【0011】
概要
図1の断面図で、本発明の射出成形同時絵付用転写シートの形態例として2形態を例示する。図1(A)の射出成形同時絵付用転写シートSは、素材シート1Aの転写層側に凹凸模様賦形層1Bを有する構成からなる支持体シート1に、転写層2として、剥離層3、補強層4、接着層5、透明アクリル樹脂シート6、絵柄層7、接着剤層8が、この順に積層されてなる構成の転写シートである。しかも、上記補強層4は、アクリル樹脂をシランカップリング剤で硬化させる2液硬化型アクリル樹脂の硬化物から構成され、更に、無機或いは有機の粉末充填剤が添加された構成としてある。
【0012】
一方、図1(B)に示す射出成形同時絵付用転写シートSの方は、図1(A)で例示した射出成形同時絵付用転写シートSに対して、絵柄層に関する構成が異なる形態である。すなわち、図1(B)の該転写シートSでは、透明アクリル樹脂シート6の裏側(図面下側)の絵柄層7は、全面ベタ柄の光輝性ベタ層として設けてあり、更に透明アクリル樹脂シート6の表側(図面上側)にも絵柄層7Aを設け、絵柄層7Aによってパターン状の絵柄を表現した形態である。
【0013】
そして、上記の如き射出成形同時絵付用転写シートSを用いて、転写形態による射出成形同時絵付けを行う事で、樹脂成形物9の表面に上記転写シートの転写層2を転写させれば、図2(A)の断面図で概念的に示す如く、表面に凹凸模様eが付与された絵付成形品Pが得られる。なお、図2中、転写層2の部分は、図1(A)や図1(B)の断面図で例示した如き転写層2部分と同様であり、図2(B)の拡大断面図は、図1(A)の射出成形同時絵付用転写シートSによる転写によって得られる構成例を示す。図2(B)では、樹脂成形物9に図1(A)に於ける転写層2部分が積層し、該転写層2表面には、凹凸模様eが付与されている。
なお、これら図面にて、凹凸模様eの深さは剥離層3内に留まる深さであるが、これら図面は概念図でもあり、凹凸模様eの深さはこれに限定されず、更に深い場合もある。
【0014】
射出成形同時絵付用転写シート:
先ず、射出成形同時絵付用転写シートから説明する。
【0015】
〔支持体シート〕
支持体シート1は、その転写層側に凹凸模様賦形層1Bを有する構成のシートであり、具体的には、素材シート1Bと、その転写層側とする面に設けた凹凸模様賦形層1Bとから構成される。
【0016】
素材シート1Aとしては、いわゆる転写シートに於ける公知のシートを使用する事ができる。なお、射出成形同時絵付用の転写シートでは有るが、射出成形同時絵付の形態によっては成形性は無くても良い。従って、素材シートとしては、例えば、ポリエチレンテレフタレート、ポリブチレンテレフタレート、エチレンテレフタレート−イソフタレート共重合体、ポリアリレート、ポリエステル系熱可塑性エラストマー等のポリエステル樹脂、ポリエチレン、ポリプロピレン、ポリメチルペンテン、オレフィン系熱可塑性エラストマー等のポリオレフィン樹脂、ナイロン6、ナイロン66等のポリアミド、塩化ビニル樹脂、エチレン−ビニルアルコール共重合体、ビニロン等のビニル重合体等からなる樹脂シート(フィルム)、或いは上質紙、薄葉紙等にポリオレフィン系樹脂やシリコーン樹脂による離型層を積層した塗工紙、グラシン紙、硫酸紙等の紙である。
なかでも、ポリエステル樹脂シート、それも2軸延伸ポリエチレンテレフタレートシートは代表的な樹脂シートである。なお、素材シートの厚さは、通常10〜100μm程度である。
【0017】
また、素材シートにポリエステル樹脂シートを用いる事によって、後述する凹凸模様賦形層に、ポリエステル樹脂を使用した硬化性樹脂を用いる場合に、素材シートと凹凸模様賦形層との密着を良好にでき、転写の際に支持体シートを剥離する時、素材シートと凹凸模様賦形層間で剥離する様な事を生じ難くできる。また、素材シートの樹脂として、ポリエステル樹脂は、耐熱性、力学的強度ともに優れており、転写時の熱や応力による破断や変形、及び支持体シート剥離時の支持体シート破断を生じ難く、転写層の剥離層として用いられる多くの樹脂との剥離性が良好であり、且つ入手の容易性、価格の点からも素材シートの材料として好適である。
【0018】
次に、凹凸模様賦形層1Bは、転写層に対しては剥離可能に素材シートと密着し、表面に凹凸模様を賦形する為の凹凸形状を有する層であれば、その材料及び形成方法等は基本的には特に限定は無い。従って、凹凸模様賦形層には、例えば、剥離性を調整する為に適宜シリコーン樹脂等を添加した、2液硬化型ウレタン樹脂やエポキシ樹脂等を使用できる。また、凹凸模様賦形層の樹脂としては、ポリエステル樹脂、アミノアルキド樹脂、及びメラミン樹脂を混合した混合樹脂で熱硬化させる熱硬化性ポリエステル樹脂は、転写層との剥離性、素材シートとの密着性等の点で好ましい樹脂の一つである。
【0019】
上記、熱硬化性ポリエステル樹脂を構成する、ポリエステル樹脂、アミノアルキド樹脂、及び、メラミン樹脂の各々の樹脂には公知の樹脂を使用すれば良い。
すなわち、上記ポリエステル樹脂には、不飽和二重結合を分子内に有する所謂不飽和ポリエステル樹脂を使う必要は無く、飽和ポリエステル樹脂を使用すれば良い。飽和ポリエステル樹脂は水酸基やカルボキシル基が反応基となる。飽和ポリエステル樹脂は、例えば、無水フタル酸やアジピン酸等の二塩基酸とプロピレングリコールやエチレングリコール等の二価アルコールとから得られる様な縮重合物等がある。
そして、上記アミノアルキド樹脂はアミノ樹脂とアルキド樹脂とを配合した樹脂である。また、アミノ樹脂は尿素、メラミン、グラアナミン、アニリン、スルホアミド、或いはアミノ基含有アクリル樹脂等のアミノ基含有化合物のアミノ基にホルムアルデヒドを反応させて得られる樹脂であり、尿素の場合は尿素樹脂、メラミンの場合はメラミン樹脂、グラアナミンの場合はグアナミン樹脂、アニリンの場合はアニリン樹脂等とも呼ばれる。また、アルキド樹脂は、例えば、無水フタル酸等の二塩基酸とグリセリン、ペンタエリスリトール等の多価アルコールとのエステルを、更にヒマシ油等の各種の油脂又は脂肪酸で変性したものが代表的であるが、更にロジンやフェノールで変性したロジン変性アルキド樹脂、フェノール変性アルキド樹脂等の変性アルキド樹脂等もある。
また、メラミン樹脂はメラミンとホルムアルデヒドから得られる樹脂で、前記アミノ樹脂の一種であるが、メラミンにホルムアルデヒドを反応させたものを有機溶剤可溶性とする為に、更にアルコールを反応させたアルキル化メラミン樹脂、代表的にはブチルアルコールで変性したブチル化メラミン樹脂が一般的である。
【0020】
また、上記熱硬化性ポリエステル樹脂は、硬化触媒(架橋促進剤)として、パラトルエンスルホン酸等の強酸を通常は添加して硬化させる。触媒の添加量は、樹脂分全量に対して1〜10質量%程度である。硬化触媒によって、加熱硬化時間を短くでき、凹凸模様賦形層を生産性良く形成できる。
【0021】
なお、ポリエステル樹脂、アミノアルキド樹脂、メラミン樹脂の各々の配合割合は物性等に応じて適宜量とすれば良い。例えば、アミノアルキド樹脂は樹脂分全量に対して10〜90質量%程度の範囲とする。また、ポリエステル樹脂とメラミン樹脂との割合は、〔ポリエステル樹脂〕/〔メラミン樹脂〕=10/90〜90/10(質量比)程度の範囲とする。
【0022】
また、凹凸模様賦形層は、その樹脂中に例えば後述絵柄層で列記する様な公知の着色剤を添加して、着色しても良い。転写シートの製造段階での凹凸模様賦形層の形成状況を目視確認でき、凹凸模様賦形層の印刷品質等の品質管理が容易となる。
【0023】
なお、凹凸模様賦形層の形成法は特に限定は無いが印刷法が代表的である。例えば、凹凸模様の凹凸高さに応じて、グラビア印刷、スクリーン印刷等の公知の印刷法を採用すれば良い。凹凸模様の凹凸高さが大きい場合には、特にスクリーン印刷が好ましい。
【0024】
また、凹凸模様賦形層が表現する凹凸模様としては、基本的には特に限定は無く、例えば、木目導管溝、木目年輪、花崗岩の劈開面、砂目、梨地、ヘアライン、万線状溝、タイル貼りや煉瓦積の目地、布目の表面テクスチュア、皮絞、文字、幾何学模様等である。但し、砂目、布目、皮絞等よりは、木目導管溝や目地等の様に平坦的な表面部分を比較的広く与える凹凸模様の方が、その部分で表面の擦り傷が目立ち易く、本発明による耐擦傷性向上効果がより効果的である。
【0025】
なお、この様な場合の凹凸模様賦形層1Bは、図1(A)及び(B)で例示の様に、素材シート1Aの全面にわたって連続していない分離独立した不連続層として形成されることが多い。但し、凹凸模様賦形層は、凹凸模様によっては、素材シートの全面にわたって連続し且つ転写層側の面が凹凸を成す連続層として形成しても良い。
【0026】
〔剥離層〕
剥離層3は、転写シートに於いて、支持体シートと転写層との剥離力を適正にする為の機能を基本機能として有する。また、剥離層は、転写後は最表面層となる関係上、表面保護層としての機能も相応に有するが、本発明では耐擦傷性に対する表面保護は、後述する補強層がより主体的に受け持つ。
また、剥離層は、支持体シートの凹凸模様賦形層の上に積層される事になる為、凹凸模様賦形層の凹凸を吸収して(埋めて)剥離層内に転写後の凹凸なる凹凸模様を受容する機能も有する。但し、剥離層は凹凸模様賦形層の凹凸高さを完全に埋め尽くせる厚さとする事は必ずしも必要無い。剥離層の次に形成する補強層、或いは更に接着層で、凹凸高さを吸収しても良い。
【0027】
上記の様な剥離層としては、支持体シートとの剥離性を有すれば、特に制限は無く、従来公知の材料及び方法で形成すれば良い。例えば、剥離層の樹脂としては、ポリメチル(メタ)アクリレート、ポリブチル(メタ)アクリレート、メチル(メタ)アクリレート−ブチル(メタ)アクリレート共重合体等のアクリル樹脂、塩化ビニル−酢酸ビニル共重合体、セルロース系樹脂等の樹脂の単独又は混合物が挙げられる。
【0028】
なお、剥離層は、上記樹脂を用いたインキ或いは塗液で、グラビア印刷、スクリーン印刷等の印刷法、或いは、グラビアコート、ロールコート等の塗工法等の公知の形成法で形成すれば良い。また、剥離層の厚みは、凹凸模様の深さ(或いは高さ)、用途、要求物性等に応じて適宜厚さとすれば良く、通常は1〜10μm程度とする。
【0029】
〔補強層〕
補強層4は、剥離層3と透明アクリル樹脂シート5との間に位置して、転写後の転写層に対して、表面擦り傷に対する耐擦傷性を強化する層である。この補強層4は、アクリル樹脂をシランカップリング剤で硬化させる2液硬化型アクリル樹脂の硬化物の層として形成し、しかも無機又は有機の粉末充填剤を添加した層として形成する。なお、この補強層4は絵柄層が透視可能な様に透明な層とする。この補強層によって、凹凸模様が賦形された表面に更に耐擦傷性も付与できる。なお、この補強層は硬化物層としてあるので、転写後は下側となる透明アクリル樹脂シートを有機溶剤から保護する耐溶剤性を付与することができる。
【0030】
上記2液硬化型アクリル樹脂の主剤としては、ヒドロキシル基やカルボキシル基等のシランカップリング剤と反応性を有する1種又は2種以上の官能基を、分子中に通常は2以上の複数導入したアクリル樹脂を使用できる。
例えば、上記官能基が2以上のヒドロキシル基の場合、該アクリル樹脂はアクリルポリオールと呼ぶ事もできる。この様なヒドロキシル基含有アクリル樹脂としては、例えば、(メタ)アクリル酸メチル、(メタ)アクリル酸エチル、(メタ)アクリル酸−n−プロピル、(メタ)アクリル酸イソプロピル、(メタ)アクリル酸−n−ブチル、(メタ)アクリル酸イソブチル、(メタ)アクリル酸オクチル、(メタ)アクリル酸エチルヘキシル等の(メタ)アクリル酸アルキルエステル単量体等の1種又は2種以上と、(メタ)アクリル酸−2−ヒドロキシエチル、(メタ)アクリル酸−2−ヒドロキシプロピル、(メタ)アクリル酸−2−ヒドロキシ−3−フェノキシプロピル等の分子中に水酸基を有する(メタ)アクリル酸エステル単量体の1種又は2種以上と、更に必要に応じ、スチレン単量体等の他のビニルモノマーとを共重合させて得られた共重合体が挙げられる。なお、(メタ)アクリル酸とは、アクリル酸又はメタクリル酸の意味である。
また、カルボキシル基を導入する場合には、アクリル酸、メタクリル酸等のカルボキシル基含有ビニルモノマーを共重合した共重合体等が使用される。
【0031】
また、硬化剤となるシランカップリング剤としては、アルコキシ基の他に更に、アミノ基、ビニル基、エポキシ基、メルカプト基、クロル基等を有する公知のシランカップリング剤を用途に応じて使用すれば良い。
例えば、γ−アミノプロピルトリエトキシシラン、γ−メタクリロキシプロピルトリメトキシシラン、γ−メタクリロキシプロピルメチルジメトキシシラン、γ−メタクリロキシプロピルジメチルメトキシシラン、γ−メタクリロキシプロピルトリエトキシシラン、γ−メタクリロキシプロピルジメチルエトキシシラン、γ−アクリロキシプロピルトリメトキシシラン、γ−アクリロキシプロピルメチルジメトキシシラン、γ−アクリロキシプロピルジメチルメトキシシラン、γ−アクリロキシプロピルトリエトキシシラン、γ−アクリロキシプロピルメチルジエトキシシラン、γ−アクリロキシプロピルジメチルエトキシシラン、ビニルトリエトキシシラン、γ−グリシドキシプロピルトリメトキシシラン、γ−メルカプトプロピルトリメトキシシランなどである。
なお、硬化剤としてのシランカップリング剤の添加量は、主剤とするアクリル樹脂に対して、5〜15質量%程度である。
【0032】
補強層中に添加する、無機又は有機の粉末充填剤は、耐擦傷性をより向上させる為のものである。該粉末充填剤としては、補強層の樹脂よりも硬質でその硬さにより耐擦傷性を付与するには、樹脂ビーズ等の有機物でも良いが、より好ましくは無機物の方が付与し易い。無機物の粉末充填剤として、例えば、アルミニウム、チタニウム、珪素、ジルコニウム、マグネシウム等の金属の酸化物、硝子、炭酸カルシウム、ダイヤモンド等が挙げられる。具体的には、例えばα−アルミナ等のアルミナ等である。この様な、粉末充填剤は、例えば、平均粒径2〜3μmで、粒径分布が最小値0.01μm、最大値6μmの範囲のもの等(具体例としては球状のα−アルミナ等)が、良好な耐擦傷性が得られる点で好ましい。また、粉末充填剤の粒子形状は、球形、鱗片状、多面体等の形状のものが使用される。
なお、粉末充填剤の添加量は、要求物性によるが、通常は、樹脂分100質量部に対して1〜50質量部程度、より好ましくは5〜30質量部程度である。
なお、2液硬化型アクリル樹脂は硬化剤にシランカップリング剤を使用している関係上、粉末充填剤として上記金属酸化物等を使用した場合には、シランカップリング剤を粉末充填剤とも反応させて、該充填剤がバインダー樹脂中に強固に結合分散した補強層とする事もできる。
【0033】
なお、補強層中には、上記粉末充填剤以外に、シリコーン樹脂、ワックス等の滑剤、ベンゾトリアゾール系、ベンゾフェノン系、微粒子酸化セリウム系等の紫外線吸収剤、ヒンダードアミン系ラジカル捕捉剤等の光安定剤、体質顔料、着色剤等の公知の添加剤を適宜使用することができる。また、これらは、前述剥離層中にも適宜使用することができる。
【0034】
なお、補強層の形成は、上記シランカップリング剤及びアクリル樹脂からなる2液硬化型アクリル樹脂を含む塗液(或いはインキ)を用いて、ロールコート等の公知の塗工法、或いはグラビア印刷等の公知の印刷法により形成すれば良い。また、補強層の厚さは、用途に応じた厚さとすれば良く、通常、2〜20μm程度とする。
【0035】
〔接着層〕
接着層5は、補強層4と透明アクリル樹脂シート6とを接着積層する為の層であるが、より具体的には、上述した支持体シート、剥離層、及び補強層のこれら各層が積層された構成の積層シートを工程シートとして、絵柄層を形成済みの透明アクリル樹脂シートに対してラミネートして接着積層させる為に用いる層である。
【0036】
従って、接着層5としては、例えば、熱融着性を有する従来公知の熱可塑性樹脂等を用いることができる。この様な熱可塑性樹脂は、例えば、酢酸ビニル樹脂、塩化ビニル−酢酸ビニル共重合体、アクリル樹脂、熱可塑性ポリエステル樹脂、ポリアミド樹脂、アイオノマー、塩素化ポリオレフィン等の熱可塑性樹脂等である。接着層は、この様な樹脂を含む塗液(或いはインキ)を用いて、ロールコート等の公知の塗工法、或いはグラビア印刷等の公知の印刷法により形成すれば良い。接着層の厚さは特に制限は無いが、通常は1〜10μm程度である。
【0037】
〔透明アクリル樹脂シート〕
透明アクリル樹脂シート6は、透明な熱可塑性アクリル樹脂からなる樹脂シートである。該熱可塑性アクリル樹脂としては、例えば、ポリメチル(メタ)アクリレート、ポリエチル(メタ)アクリレート、ポリブチル(メタ)アクリレート、メチル(メタ)アクリレート−ブチル(メタ)アクリレート共重合体、エチル(メタ)アクリレート−ブチル(メタ)アクリレート共重合体、メチル(メタ)アクリレート−スチレン共重合体等のアクリル樹脂〔但し、(メタ)アクリレートとは、アクリレート又はメタクリレートの意味〕を単体又は2種以上の混合物で用いる。透明アクリル樹脂シートはこれらアクリル樹脂からなる単層のシート、又は2層以上の積層体シートを用いることができる。
なお、透明アクリル樹脂シートの厚みは、特に限定されず用途によるが、30〜500μm程度、一般的には50〜250μm程度である。
【0038】
また、透明アクリル樹脂シートの透明とは、無着色透明、着色透明、半透明等である。なお、透明アクリル樹脂シートを着色するには、後述する絵柄層で述べる様な公知の着色剤等を樹脂中に練り込めば良い。
また、透明アクリル樹脂シートの表側面や裏側面には、必要に応じ適宜、他層との密着性向上のために、コロナ放電処理、プラズマ処理等の表面易接着処理を施しても良い。
【0039】
〔絵柄層〕絵柄層7は、少なくとも透明アクリル樹脂シート6の裏側面に形成する。また、絵柄層はこの他に、図1(B)で例示した射出成形同時絵付用転写シートSの絵柄層7Aの如く、補強層4と接着層5の間に追加形成しても良い。絵柄層7は、通常、接着層5を積層前の状態の透明アクリル樹脂シート6に対して印刷等で形成する。一方、追加的な絵柄層7Aは、通常、支持体シート1上に、順次、剥離層、補強層を形成した次に印刷等で形成し、それに続いて、接着層5を形成する。
【0040】
絵柄層7(或いは7A)としては、代表的には模様や文字等の絵柄を表現する層である。絵柄は任意であるが、例えば、木目模様、石目模様、砂目模様、布目模様、皮絞模様、タイル貼模様、煉瓦積模様、幾何学図形、文字、記号、或いは全面ベタ等を1種又は2種以上を組合わせた模様等が用いられる。なお、透明アクリル樹脂シートよりも支持体シート側に設ける絵柄層7Aの場合には、通常は、全面ベタでは無く、パターン状に形成する。
【0041】
絵柄層7は、公知の印刷法で形成することができる。印刷は、例えば、グラビア印刷、シルクスクリーン印刷、オフセット印刷等による。また、全面ベタの場合には、グラビアコート、ロールコート等の公知の塗工法で形成してもよい。
【0042】
印刷(或いは塗工)に用いるインキ(或いは塗液)としては、接着性等を考慮して公知のものの中から適宜選択使用すれば良い。例えば、インキ(或いは塗液)のバインダーの樹脂としては、アクリル樹脂、塩化ビニル−酢酸ビニル共重合体、ポリエステル樹脂、ポリウレタン樹脂等を1種単独で、或いは2種以上混合して用いる。また、インキ(或いは塗液)に含有させる着色剤としては、例えば、チタン白、亜鉛華、カーボンブラック、鉄黒、弁柄、カドミウムレッド、群青、コバルトブルー、黄鉛、チタンイエロー等の無機顔料、フタロシアニンブルー、インダスレンブルー、イソインドリノンイエロー、キナクリドンレッド、ペリレンレッド等の有機顔料、アルミニウム、真鍮等の金属の粉末又は鱗片等の金属顔料、二酸化チタン被覆雲母の粉末又は鱗片等の真珠光沢(パール)顔料、或いは染料等が用いられる。金属顔料や真珠光沢(パール)顔料を用いれば光輝性の絵柄層を形成できる。
【0043】
なお、絵柄層としては、例えばアルミニウム、クロム等を蒸着して全面或いは部分的に形成した金属薄膜層等でも良い。
また、絵柄層としては、木目等の柄意匠の表現以外に、磁性体層、導電性層等の機能性層等でも良い。
【0044】
〔接着剤層〕
接着剤層8としては、樹脂成形物材料に応じて、例えば感熱型の接着剤として熱可塑性樹脂、熱硬化性樹脂等の公知の樹脂を用いることができる。熱可塑性樹脂では、例えば、酢酸ビニル樹脂、塩化ビニル−酢酸ビニル共重合体、アクリル樹脂、熱可塑性ポリエステル樹脂、ポリアミド樹脂、アイオノマー、塩素化ポリオレフィン樹脂、熱可塑性ウレタン樹脂、ゴム系樹脂等の1種又は2種以上の混合物が用いられる。また、熱硬化性樹脂では、フェノール樹脂、ブロックイソシアネート硬化型等のウレタン樹脂、エポキシ樹脂等が用いられる。
接着剤層は、これら樹脂による接着剤を、グラビア印刷、ロールコート等の公知の印刷又は塗工法により形成する。また、接着剤層の厚さは特に制限は無いが、通常は1〜100μm程度である。
【0045】
絵付成形品:
本発明による絵付成形品は、図2(A)の断面図でその一形態を例示する如く、上述した射出成形同時絵付用転写シートの転写によって、樹脂成形物9の表面が絵付されて成り、表面に凹凸模様eが付与された構成の成形品である。絵付成形品Pは、樹脂成形物9上に、前述転写シートにおける転写層2部分が、その接着剤層8側を樹脂成形物9側を向けて積層された構成である。そして、図2(B)の絵付成形品Pは、その転写層部分の一形態を更に詳述した部分拡大断面図である。図2(B)に示す絵付成形品Pの構成は、樹脂成形物9上に、転写層2として、樹脂成形物9側から順に、接着剤層8、絵柄層7、透明アクリル樹脂シート6、接着層5、補強層4、剥離層3、そして、これらから成る転写層2の表面に凹凸模様eが賦形されている構成である。この図2(B)に例示する転写層2は、前述図1(A)で例示した構成の射出成形同時絵付用転写シートSの転写によって形成され得る。
なお、射出成形同時絵付用転写シートの転写は、好適には、転写形態での射出成形同時絵付方法によって行える。
【0046】
〔射出樹脂〕
なお、樹脂成形物となる射出樹脂としては、基本的には特に制限はなく公知の樹脂で良い。製品の要求物性やコスト等に応じて選定すれば良い。熱可塑性樹脂であれば、ABS(アクリロニトリル−ブタジエン−スチレン共重合体)樹脂、スチレン樹脂、アクリル樹脂、塩化ビニル樹脂、ポリカーボネート樹脂、ポリオレフィン系樹脂等である。また、硬化性樹脂であれば、2液硬化型の樹脂、例えば、ウレタン樹脂、不飽和ポリエステル樹脂、エポキシ樹脂等の未硬化樹脂液等である。熱可塑性樹脂は加熱熔融して流動状態で射出し、また硬化性樹脂は(その未硬化物を)室温又は適宜加熱して流動状態で射出する。
なお、射出樹脂は、用途に応じて適宜、着色剤を添加して着色した樹脂を使用しても良い。着色剤には、前述基材シートで述べた如き公知の着色剤を使用すれば良い。また、射出樹脂には、必要に応じ適宜、シリカ、アルミナ、タルク、炭酸カルシウム、水酸化アルミニウム等の無機物粉末、ガラス繊維等の充填剤、安定剤、滑剤等の公知の各種添加剤を含有させる。
【0047】
〔成形品形状〕
なお、絵付成形品の形状は、転写面は凹凸面等の非平面、或いは平面の立体物である。また、絵付成形品の形状は、板状(平板、曲面板等)、柱状、三次元立体物等と任意である。
【0048】
射出成形同時絵付方法:
ここで、前述した射出成形同時絵付用転写シートの用途として、或いは上述した絵付成形品の製造方法として好適な絵付方法である、射出成形同時絵付方法について説明しておく。なお、射出成形同時絵付方法にはラミネート形態と転写形態とに大別されるが、ここでの形態は転写形態である。転写形態の射出成形同時絵付方法は、特公平2−42080号公報、特開平6−315950号公報等に記載されるように、射出成形同時絵付用転写シートを雌雄両型間に挿入した後、両型を型締めし、両型で形成されるキャビティ内に流動状態の樹脂を射出し固化させて、樹脂成形物の成形と同時にその表面に射出成形同時絵付用転写シートを一旦積層した後、該転写シートの支持体シートのみを剥離し、転写層を樹脂成形物表面に転写させることで絵付して、絵付成形品を得る方法である。
【0049】
射出成形同時絵付方法では、射出成形同時絵付用転写シートの予熱無しの場合でも、射出樹脂による熱圧を射出成形同時絵付用転写シートが受ける。従って、射出成形同時絵付用転写シートの予備成形は行う形態でも行わない形態でも、いずれでも良い。また、射出成形同時絵付用転写シートの予熱は、行っても良く、行わなくても良い。なお、予備成形時には通常は射出成形同時絵付用転写シートは予熱する。
【0050】
なお、もちろんの事だが、射出成形同時絵付用転写シートの絞りが大きい場合は、予備成形を行うのが好ましい。一方、射出成形同時絵付用転写シートの絞りが少ない場合は、射出される流動状態の樹脂の樹脂圧と樹脂熱で射出成形同時絵付用転写シートを成形しても良い。この際、絞りが浅ければ、予備成形無しで樹脂射出と同時に型内に充填される流動状態の樹脂の樹脂圧と樹脂熱のみで射出成形同時絵付用転写シートを成形しても良い。また、樹脂圧と樹脂熱で射出成形同時絵付用転写シートを成形する場合でも、射出成形同時絵付用転写シートの加熱は射出樹脂の樹脂熱のみを利用し予熱はしない事もある。また、射出成形同時絵付用転写シートの予備成形は、通常は、射出成形型を真空成形型と兼用して行うが、型間に射出成形同時絵付用転写シートを供給する前に、射出成形型外部で別の真空成形型で射出成形同時絵付用転写シートを真空成形する様な予備成形(オフライン予備成形)でも良い。但し、予備成形は、射出成形型と真空成形型とを兼用して行う形態が効率的且つ精度良く射出成形同時絵付用転写シートを積層できる点で好ましい。しかし、予備成形済みの射出成形同時絵付用転写シートを予め別の場所で纏めて製造しておく場合等では、予備成形はオフライン予備成形の形態が好ましい。なお、本発明の説明に於いて真空成形とは真空圧空成形も包含する。
【0051】
図3の概念図によって、射出成形同時絵付方法を、その或る一形態で説明する。なお、ここで説明する形態は、型締めする前に、射出成形同時絵付用転写シートを型間で加熱し軟化させて射出成形型で真空成形により予備成形した後に、型締めして樹脂を射出する形態である。
また、この形態は、上記した射出成形同時絵付用転写シートの予備成形、予熱の各種組合わせ形態の中で、射出成形同時絵付用転写シートの絞りが深い場合に、より好ましい形態である。
【0052】
先ず、図3(A)の如く、射出成形型としては、射出ノズルと連通する湯道(ランナー)及び湯口(ゲート)を有する型(雄型)Maと、キャビティ面に吸引孔41を有しシートの予備成形型を兼用する型(雌型)Mbの一対の成形型を用いる。これらの型は鉄等の金属、或いはセラミックスからなる。型開き状態に於いて両型Ma、Mb間に射出成形同時絵付用転写シートSを供給し、型Mbに射出成形同時絵付用転写シートSを平面視枠状のシートクランプ42で押圧する等して固定する。この際、射出成形同時絵付用転写シートの接着剤層側は、図面右側の射出樹脂側となる様にする事はもちろんである。次いで、適宜、両型間に挿入したヒータ(図示略)で射出成形同時絵付用転写シートを加熱軟化させる。加熱は例えば非接触の輻射加熱とするが、接触による伝導加熱でも良い。そして、吸引孔から吸引して真空成形して、射出成形同時絵付用転写シートを型Mbのキャビティ面に沿わせ予備成形する。次いで、ヒータを両型間から退避させ、図3(B)の如く両型を型締めし、両型で形成されるキャビティに加熱熔融状態等の流動状態の樹脂を充填する。そして、樹脂が冷却等によって固化した後、型開きして成形物を取り出せば、絵付成形品が得られるという絵付方法である。
なお、ここでは転写形態であるので、支持体シートを型Mb側に残した状態で絵付成形品を取り出すか、或いは、射出成形同時絵付用転写シート全層が積層された状態で成形物を取り出し後、支持体シートを剥離して、転写層のみが積層されて絵付けされた絵付成形品を得る。
【0053】
ここで、射出成形同時絵付方法を、例えば、射出成形型を真空成形型と兼用して射出成形同時絵付用転写シートを予備成形する形態に於ける或る一例として、工程毎に分けて述べれば、次の様な工程からなる射出成形同時絵付方法がある。すなわち、雌雄一対からなる型が型開き状態の時に雌型のパーティング面上に射出成形同時絵付用転写シートを供給するシート供給工程と、前記射出成形同時絵付用転写シートを雌型のパーティング面上に固定保持するクランプ工程と、前記射出成形同時絵付用転写シートを延伸させて雌型のキャビティ面に沿わせる延伸工程(予備成形工程)と、雌型と雄型とを型締めする型締め工程と、雌型と雄型とで形成されるキャビティ内に流動状態の樹脂を注入充填し固化させて、樹脂成形物と前記射出成形同時絵付用転写シートとを積層一体化させる射出工程と、雌型と雄型とを離間させる型開き工程と、樹脂成形物が射出成形同時絵付用転写シートで絵付された絵付成形品を取り出す取出し工程、をこの順に行う射出成形同時絵付方法がある。
なお、取出し工程では、上述した如く、その支持体シートを雌型側に残した状態で絵付成形品を取り出すか、或いは、射出成形同時絵付用転写シート全層が積層された状態で成形物を取り出し後、支持体シートを剥離して、転写層のみが積層されて絵付された絵付成形品を得る。
【0054】
【実施例】
以下、実施例及び比較例により本発明を更に詳述する。
【0055】
〔実施例1〕
図1(A)の如き構成の射出成形同時絵付用転写シートSを次の様にして作製した。
【0056】
先ず、支持体シート1の素材シート1Aとして、厚さ26μmの2軸延伸ポリエチレンテレフタレートフィルムを用意し、その片面に木目導管溝模様の凹凸模様を賦形する為の凹凸模様賦形層1Bを、ポリエステル樹脂、アミノアルキド樹脂、及びメラミン樹脂の混合樹脂からなる熱硬化性ポリエステル樹脂を用いたインキをグラビア印刷して素材シート面が露出する様にパターン状に形成して、素材シート1A及び凹凸模様賦形層1Bとからなる支持体シート1を作製した。
【0057】
次に、上記支持体シート1の凹凸模様賦形層1B側の面に、転写層2の一部として、先ず、剥離層3、補強層4、接着層5をこの順にグラビア印刷で全面に形成して工程シートを得た。
なお、上記剥離層3は、ポリメチルメタクリレートを主成分とするアクリル樹脂を用いて厚さ2μmに形成した。また、補強層4は、アクリル樹脂の主剤100質量部に対してシランカップリング剤を硬化剤として12質量部添加した2液硬化型アクリル樹脂100質量部に対して、更に平均粒径2.5μmで球状のα−アルミナ粉末を30質量部添加し、これに適量の有機溶剤を添加したインキを用いて厚さ4μmに形成した。また、接着層5は、アクリル樹脂と塩化ビニル−酢酸ビニル共重合体との1対1質量比の混合樹脂を用いて厚さ4μmに形成した。
【0058】
一方、厚さ125μmの透明アクリル樹脂シート6に対して、その裏側とする面に、アクリル樹脂と塩化ビニル−酢酸ビニル共重合体との1対1質量比混合樹脂を用いた着色インキによって木目柄の絵柄層7と、同じく、アクリル樹脂と塩化ビニル−酢酸ビニル共重合体との1対1質量比混合樹脂を用いて厚さ3μmの接着剤層8を、この順にグラビア印刷で形成した。
【0059】
そして、上記絵柄層及び接着剤層が形成された透明アクリル樹脂シートの表側とする面に対して、前記工程シートをその接着層によって、ラミネートローラを用いて加熱ラミネートして、図1(A)の如き、所望の射出成形同時絵付用転写シートSを得た。
【0060】
次に、上記射出成形同時絵付用シートを、射出成形樹脂としてABS樹脂を用いて図3の如き射出成形同時絵付法によって、図2(A)及び(B)の様な樹脂成形物9の表面に転写層2が転写積層し、成形品表面に凹凸模様eが付与された構成の絵付成形品Pを作製した。
【0061】
〔実施例2〕
図1(B)の如き構成の射出成形同時絵付用転写シートSを次の様にして作製した。
【0062】
先ず、支持体シート1の素材シート1Aとして、厚さ26μmの2軸延伸ポリエチレンテレフタレートフィルムを用意し、その片面に抽象柄の凹凸模様を賦形する為の凹凸模様賦形層1Bを、ポリエステル樹脂、アミノアルキド樹脂、及びメラミン樹脂の混合樹脂からなる熱硬化性ポリエステル樹脂を用いたインキをグラビア印刷して素材シート面が露出する様にパターン状に形成して、素材シート1A及び凹凸模様賦形層1Bとからなる支持体シート1を作製した。
【0063】
次に、上記支持体シート1の凹凸模様賦形層1B側の面に、転写層2の一部として、先ず、剥離層3、補強層4、抽象柄の絵柄層7A、接着層5をこの順にグラビア印刷で形成して工程シートを得た。
なお、上記剥離層3は、ポリメチルメタクリレートを主成分とするアクリル樹脂を用いて全面に厚さ2μmで形成した。また、補強層4は、アクリル樹脂の主剤100質量部に対してシランカップリング剤を硬化剤として12質量部添加した2液硬化型アクリル樹脂100質量部に対して、更に平均粒径2.5μmで球状のα−アルミナ粉末を30質量部添加し、これに適量の有機溶剤を添加したインキを用いて全面に厚さ4μmで形成した。また、絵柄層7Aには、アクリル樹脂と塩化ビニル−酢酸ビニル共重合体との1対1質量比の混合樹脂による着色インキを用いてパターン状に部分的に形成した。また、接着層5は、アクリル樹脂と塩化ビニル−酢酸ビニル共重合体との1対1質量比の混合樹脂を用いて全面に厚さ4μmで形成した。
【0064】
一方、厚さ125μmの透明アクリル樹脂シート6に対して、その裏側とする面に、アクリル樹脂と塩化ビニル−酢酸ビニル共重合体との1対1質量比混合樹脂と光輝性顔料を含む光輝性インキによって全面ベタ柄の絵柄層7と、アクリル樹脂と塩化ビニル−酢酸ビニル共重合体との1対1質量比の混合樹脂を用いて厚さ3μmの接着剤層8を、この順にグラビア印刷で形成した。
【0065】
そして、上記絵柄層7及び接着剤層8が形成された透明アクリル樹脂シートの表側とする面に対して、前記工程シートをその接着層によって、ラミネートローラを用いて加熱ラミネートして、図1(B)の如き、所望の射出成形同時絵付用転写シートSを得た。
そして、この射出成形同時絵付用シートを、実施例1と同様にして射出成形同時絵付法に適用して、樹脂成形物の表面に転写層が転写され積層され、成形品表面に凹凸模様が付与された構成の絵付成形品を作製した。また、絵付成形品は、透明アクリル樹脂シート下の光輝性の絵柄層によって、深みの有る意匠感が得られた。
【0066】
〔比較例1〕
実施例1に於いて、その射出成形同時絵付用転写シートを作製時に、補強層の形成を省略した他は、実施例1と同様にして射出成形同時絵付用転写シートを作製した。そして、この射出成形同時絵付用転写シートを用いて、実施例1と同様にして絵付成形品を作製した。
【0067】
〔性能評価〕
実施例及び比較例で得られた絵付成形品について、耐擦傷性を評価した。
耐擦傷性は、絵付成形品の表面をスチールウール(日本スチールウール株式会社製、商品名「ボンスター」、品番0000)にて、9.8N(1kgf)の荷重にて複数回擦った後、表面の異常の有無を目視観察して評価した。その結果、比較例1では、3往復で表面に擦り傷が認められたが、実施例1及び2では、50回往復にて始めて表面に擦り傷が認められる程度であり、耐擦傷性は良好であった。
【0068】
【発明の効果】
本発明によれば、凹凸模様の付与、及び塗装感の付与と共に、更に耐擦傷性も付与できる。
【図面の簡単な説明】
【図1】本発明の射出成形同時絵付用転写シートの形態例を例示する断面図。
【図2】本発明で利用する射出成形同時絵付方法をその一形態で説明する概念図。
【図3】本発明の絵付成形品の一形態を例示する断面図。
【符号の説明】
1 支持体シート
1A 素材シート
1B 凹凸模様賦形層
2 転写層
3 剥離層
4 補強層
5 接着層
6 透明アクリル樹脂シート
7 絵柄層
7A 絵柄層
8 接着剤層
9 樹脂成形物
41 吸引孔
42 シートクランプ
e 凹凸模様
Ma 射出成形型(雄型)
Mb 射出成形型(雌型)
P 絵付成形品
S 射出成形同時絵付用転写シート
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transfer sheet used for simultaneous injection molding and a molded article obtained by using the transfer sheet. In particular, the present invention relates to a transfer sheet that has excellent surface roughness and a feeling of painting as well as good scratch resistance and a molded article with a picture obtained using the transfer sheet.
[0002]
[Prior art]
Pictured molded products obtained by painting the surface of a resin molded product with a picture sheet are used for various purposes. As a typical method for obtaining such a molded article with a picture, a method for simultaneous painting with injection molding (Japanese Patent Publication No. 50-19132, Japanese Patent Publication No. 43-27488, Japanese Patent Laid-Open No. 6-315950, Japanese Patent Publication No. 2-4080). Gazette, etc.). This simultaneous injection molding is roughly divided into a laminate form and a transfer form. In the laminate form, the entire layer of the picture sheet is laminated on the surface of the resin molded product. Moreover, in the transfer form, a transfer sheet having a structure in which a transfer layer is laminated on a support sheet is used as a picture sheet. After the entire transfer sheet is once laminated on the surface of the resin molded product, the support sheet is peeled off. Finally, only the transfer layer is laminated on the surface of the resin molding.
[0003]
In addition, when providing a concavo-convex pattern such as a wood grain conduit groove pattern on the surface of a molded article with a picture, in the case of a laminated form, for example, by providing a concavo-convex pattern for shaping on the cavity surface of an injection mold, This can be dealt with by forming a concavo-convex pattern on the surface of the picture sheet during injection molding. On the other hand, in the case of the transfer form, as in the case of the laminate form, an uneven pattern for shaping is provided on the cavity surface of the injection mold by metal processing or the like, and the transfer layer surface is passed through the transfer sheet support sheet. There is a case where a concavo-convex pattern is formed, and a case where a transfer sheet side surface of a transfer sheet is formed as a concavo-convex surface with a concavo-convex pattern shaping layer, etc. .
On the other hand, in order to obtain a feeling of painting, it is difficult to form a thick transparent resin layer in the transfer form. Therefore, as a laminate form, the base sheet of the picture sheet is transparent with an acrylic resin excellent in moldability and the like. In many cases, a resin sheet is used to obtain a feeling of painting on the pattern layer provided on the back side.
In addition, when obtaining abrasion resistance for a pattern layer formed by printing or the like, since the thickness cannot be increased in the transfer form, a pattern layer is formed on the back side of the transparent resin sheet as a laminate form. Protecting the pattern layer is excellent in terms of performance.
[0004]
[Problems to be solved by the invention]
However, when a feeling of painting is obtained together with the concavo-convex pattern, the feeling of painting is better in the laminate form as described above, but it is difficult in terms of the concavo-convex pattern. is there. Moreover, in the laminate form, an acrylic resin sheet is mainly used in consideration of moldability, transparency, etc., but the acrylic resin sheet is not very good with respect to scratch resistance. Regarding the scratch resistance, there are sheets having excellent scratch resistance such as a polycarbonate resin sheet, but there are difficulties in formability (processing stability), cost, and the like.
[0005]
That is, the subject of this invention is providing the injection molding simultaneous painting technique which can satisfy | fill all of a concavo-convex pattern, a feeling of painting, and abrasion resistance. And it is providing the transfer sheet | seat for injection molding simultaneous painting for that purpose, and the molded article with a picture obtained by it.
[0006]
[Means for Solving the Problems]
  Therefore, in order to solve the above problems, the present invention provides a transfer sheet used in the following transfer form, and a molded article with a picture obtained using the transfer sheet. That is, the transfer sheet for simultaneous injection-molding of the present invention comprises a support sheet having a concavo-convex pattern shaping layer on the transfer layer side, a transfer layer, a release layer, a reinforcing layer, an adhesive layer, a transparent acrylic resin sheet, a pattern A transfer sheet for simultaneous injection molding with a layer and an adhesive layer, wherein an inorganic or organic powder filler is added to the reinforcing layer, and the reinforcing layer is made of acrylic resin with a silane coupling agent. It consists of a cured product of a two-part curable acrylic resin to be cured, and is formed of a transparent layer so that the picture layer can be seen through.And a thermoplastic resin of vinyl acetate resin, vinyl chloride-vinyl acetate copolymer, acrylic resin, thermoplastic polyester resin, polyamide resin, ionomer, and chlorinated polyolefin, wherein the adhesive layer has heat-fusibility.It was set as the characteristic characterized by being.
[0007]
By adopting such a configuration, a concavo-convex pattern can be imparted and a coating feeling can also be obtained with a transparent acrylic resin sheet, and after transfer, a reinforcement made of a specific material that will be located on the surface side of the transparent acrylic resin sheet The layer also provides wear resistance. Accordingly, it is possible to satisfy all of the provision of the uneven pattern, the feeling of painting, and the scratch resistance.
[0008]
In addition, the picture-molded article of the present invention is a molded article having a structure in which the transfer layer of the transfer sheet is laminated on the surface of the resin molding by transferring the above-mentioned injection-molded simultaneous picture-transfer sheet.
[0009]
With such a configuration, the effect of the above-described transfer sheet for simultaneous painting with injection molding can be obtained. Accordingly, as a result, it is possible to impart all of the uneven pattern imparting, the feeling of painting, and the scratch resistance to the molded article with a picture.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0011]
Overview:
In the cross-sectional view of FIG. 1, two forms are illustrated as examples of the transfer sheet for simultaneous injection-molding with the present invention. A transfer sheet S for simultaneous injection molding with pictures in FIG. 1 (A) has a support layer 1 having a structure having a concavo-convex pattern shaping layer 1B on the transfer layer side of the material sheet 1A, a transfer layer 2, a release layer 3, The transfer sheet has a configuration in which the reinforcing layer 4, the adhesive layer 5, the transparent acrylic resin sheet 6, the pattern layer 7, and the adhesive layer 8 are laminated in this order. Moreover, the reinforcing layer 4 is composed of a cured product of a two-component curable acrylic resin that cures the acrylic resin with a silane coupling agent, and further has an inorganic or organic powder filler added thereto.
[0012]
On the other hand, the transfer sheet S for injection-molded simultaneous painting shown in FIG. 1 (B) is different from the injection-sheet transfer sheet for simultaneous painting with injection illustrated in FIG. . That is, in the transfer sheet S of FIG. 1B, the pattern layer 7 on the back side (lower side of the drawing) of the transparent acrylic resin sheet 6 is provided as a glossy solid layer with a solid pattern on the entire surface, and the transparent acrylic resin sheet. The pattern layer 7A is also provided on the front side (upper side of the drawing) of FIG. 6, and a pattern-like pattern is expressed by the pattern layer 7A.
[0013]
Then, using the injection molding simultaneous painting transfer sheet S as described above, by performing the injection molding simultaneous painting in the transfer form, if the transfer layer 2 of the transfer sheet is transferred to the surface of the resin molding 9, As conceptually shown in the cross-sectional view of FIG. 2A, a molded article P with a concavo-convex pattern e on the surface is obtained. In FIG. 2, the transfer layer 2 is the same as the transfer layer 2 illustrated in the cross-sectional views of FIGS. 1A and 1B, and the enlarged cross-sectional view of FIG. The structural example obtained by transcription | transfer by the transfer sheet S for injection molding simultaneous painting of FIG. 1 (A) is shown. In FIG. 2 (B), the transfer layer 2 portion in FIG. 1 (A) is laminated on the resin molded product 9, and a concavo-convex pattern e is provided on the surface of the transfer layer 2.
In these drawings, the depth of the concavo-convex pattern e is the depth that remains in the release layer 3, but these drawings are also conceptual diagrams, and the depth of the concavo-convex pattern e is not limited to this, and the depth is deeper. There is also.
[0014]
Transfer sheet for simultaneous injection molding:
First, the transfer sheet for simultaneous painting with injection molding will be described.
[0015]
[Support sheet]
The support sheet 1 is a sheet having a concavo-convex pattern shaping layer 1B on the transfer layer side. Specifically, the base sheet 1B and the concavo-convex pattern shaping layer provided on the surface on the transfer layer side are provided. 1B.
[0016]
As the material sheet 1A, a known sheet in a so-called transfer sheet can be used. Although it is a transfer sheet for simultaneous injection-molding painting, there is no need for formability depending on the form of simultaneous injection-molding painting. Therefore, as the material sheet, for example, polyethylene terephthalate, polybutylene terephthalate, ethylene terephthalate-isophthalate copolymer, polyarylate, polyester resin such as polyester thermoplastic elastomer, polyethylene, polypropylene, polymethylpentene, olefin thermoplastic Polyolefin resin such as elastomer, polyamide such as nylon 6 and nylon 66, vinyl chloride resin, ethylene-vinyl alcohol copolymer, resin sheet (film) made of vinyl polymer such as vinylon, etc. or polyolefin on fine paper, thin paper, etc. Paper such as coated paper, glassine paper, sulfuric acid paper, etc., on which a release layer made of a base resin or silicone resin is laminated.
Among them, a polyester resin sheet, that is, a biaxially stretched polyethylene terephthalate sheet is a typical resin sheet. In addition, the thickness of a raw material sheet is about 10-100 micrometers normally.
[0017]
In addition, by using a polyester resin sheet for the material sheet, when a curable resin using a polyester resin is used for the concavo-convex pattern shaping layer described later, the adhesion between the material sheet and the concavo-convex pattern shaping layer can be improved. When the support sheet is peeled off at the time of transfer, it can be made difficult to cause peeling between the material sheet and the concavo-convex pattern forming layer. In addition, as a resin for the material sheet, polyester resin is excellent in both heat resistance and mechanical strength, and it is difficult to cause breakage and deformation due to heat and stress during transfer, and breakage of the support sheet when the support sheet is peeled off. Peelability with many resins used as the release layer of the layer is good, and it is also suitable as a material for the material sheet from the viewpoint of availability and cost.
[0018]
Next, the concavo-convex pattern shaping layer 1B is a transfer layer.2If it is a layer which has the uneven | corrugated shape for closely_contact | adhering to a raw material sheet | seat and shape | molds an uneven | corrugated pattern on the surface, there will be no limitation in particular in the material, formation method, etc. Therefore, for example, a two-component curable urethane resin or an epoxy resin to which a silicone resin or the like is appropriately added in order to adjust the peelability can be used for the concavo-convex pattern shaping layer. In addition, as the resin for the concavo-convex pattern shaping layer, a thermosetting polyester resin that is thermoset with a mixed resin in which a polyester resin, an amino alkyd resin, and a melamine resin are mixed is peelable from the transfer layer and adhered to the material sheet. It is one of preferred resins in terms of properties.
[0019]
A known resin may be used for each of the polyester resin, amino alkyd resin, and melamine resin that constitute the thermosetting polyester resin.
That is, for the polyester resin, it is not necessary to use a so-called unsaturated polyester resin having an unsaturated double bond in the molecule, and a saturated polyester resin may be used. In the saturated polyester resin, a hydroxyl group or a carboxyl group becomes a reactive group. Examples of the saturated polyester resin include a polycondensate obtained from a dibasic acid such as phthalic anhydride or adipic acid and a dihydric alcohol such as propylene glycol or ethylene glycol.
The amino alkyd resin is a resin in which an amino resin and an alkyd resin are blended. The amino resin is a resin obtained by reacting formaldehyde with the amino group of an amino group-containing compound such as urea, melamine, graanamin, aniline, sulfoamide, or an amino group-containing acrylic resin. In the case of urea, urea resin, melamine Is called melamine resin, guanamine is called guanamine resin, and aniline is called aniline resin. The alkyd resin is typically, for example, an ester of a dibasic acid such as phthalic anhydride and a polyhydric alcohol such as glycerin or pentaerythritol, which is further modified with various oils or fatty acids such as castor oil. However, there are also rosin-modified alkyd resins modified with rosin or phenol, modified alkyd resins such as phenol-modified alkyd resins, and the like.
Melamine resin is a resin obtained from melamine and formaldehyde, which is a kind of amino resin. Alkylated melamine resin that is further reacted with alcohol to make soluble melamine formaldehyde react with organic solvent. Typically, butylated melamine resins modified with butyl alcohol are common.
[0020]
The thermosetting polyester resin is usually cured by adding a strong acid such as paratoluenesulfonic acid as a curing catalyst (crosslinking accelerator). The addition amount of the catalyst is about 1 to 10% by mass with respect to the total resin content. With the curing catalyst, the heat curing time can be shortened, and the concavo-convex pattern shaped layer can be formed with good productivity.
[0021]
The blending ratio of each of the polyester resin, amino alkyd resin, and melamine resin may be appropriately determined according to physical properties and the like. For example, the amino alkyd resin is in the range of about 10 to 90% by mass with respect to the total amount of the resin. Moreover, the ratio of a polyester resin and a melamine resin shall be the range of about [polyester resin] / [melamine resin] = 10 / 90-90 / 10 (mass ratio).
[0022]
In addition, the concavo-convex pattern shaping layer may be colored by adding a known colorant such as listed in the pattern layer described later to the resin. The state of formation of the concavo-convex pattern shaping layer at the production stage of the transfer sheet can be visually confirmed, and quality control such as printing quality of the concavo-convex pattern shaping layer becomes easy.
[0023]
In addition, although the formation method of an uneven | corrugated pattern shaping layer does not have limitation in particular, a printing method is typical. For example, a known printing method such as gravure printing or screen printing may be employed according to the uneven height of the uneven pattern. Screen printing is particularly preferred when the uneven height of the uneven pattern is large.
[0024]
In addition, as the concavo-convex pattern expressed by the concavo-convex pattern shaping layer, there is basically no particular limitation, for example, wood grain conduit groove, wood grain annual ring, cleaved surface of granite, sand grain, satin, hairline, line-like groove, These include tiled and brick joints, fabric surface textures, leather squeezing, letters, and geometric patterns. However, an uneven pattern that gives a relatively flat surface portion, such as a wood grain conduit groove or joint, is more prominent in surface scratches at that portion than the grain, fabric, leather, etc. The effect of improving the scratch resistance due to is more effective.
[0025]
In addition, the concavo-convex pattern shaping layer 1B in such a case is formed as a separate and independent discontinuous layer that is not continuous over the entire surface of the material sheet 1A as illustrated in FIGS. 1 (A) and 1 (B). There are many cases. However, depending on the concavo-convex pattern, the concavo-convex pattern shaping layer may be formed as a continuous layer which is continuous over the entire surface of the material sheet and the transfer layer side surface is concavo-convex.
[0026]
[Peeling layer]
The release layer 3 has a function for making the release force between the support sheet and the transfer layer appropriate in the transfer sheet as a basic function. In addition, the release layer has a function as a surface protective layer in view of being the outermost surface layer after transfer, but in the present invention, the reinforcing layer described later is more mainly responsible for surface protection against scratch resistance. .
In addition, since the release layer is laminated on the uneven pattern shaping layer of the support sheet, the unevenness of the uneven pattern shaping layer is absorbed (filled) to become uneven after transfer in the release layer. It also has the function of accepting uneven patterns. However, the release layer is not necessarily required to have a thickness that can completely fill the uneven height of the uneven pattern shaping layer. The unevenness height may be absorbed by a reinforcing layer formed next to the release layer, or further by an adhesive layer.
[0027]
The release layer as described above is not particularly limited as long as it has releasability from the support sheet, and may be formed by a conventionally known material and method. For example, as the resin for the release layer, acrylic resins such as polymethyl (meth) acrylate, polybutyl (meth) acrylate, methyl (meth) acrylate-butyl (meth) acrylate copolymer, vinyl chloride-vinyl acetate copolymer, cellulose A single resin or a mixture of resins such as a resin may be used.
[0028]
The release layer may be formed by a known forming method such as gravure printing or screen printing, or a coating method such as gravure coating or roll coating, using an ink or a coating liquid using the above resin. In addition, the thickness of the release layer may be appropriately determined according to the depth (or height) of the concavo-convex pattern, application, required physical properties, and the like, and is usually about 1 to 10 μm.
[0029]
(Reinforcement layer)
The reinforcing layer 4 is a layer that is positioned between the release layer 3 and the transparent acrylic resin sheet 5 and enhances the scratch resistance against surface scratches with respect to the transferred layer after transfer. The reinforcing layer 4 is formed as a layer of a cured product of a two-component curable acrylic resin in which an acrylic resin is cured with a silane coupling agent, and is formed as a layer to which an inorganic or organic powder filler is added. The reinforcing layer 4 is a transparent layer so that the pattern layer can be seen through. By this reinforcing layer, scratch resistance can be further imparted to the surface on which the uneven pattern is shaped. In addition, since this reinforcement layer is a hardened | cured material layer, the solvent resistance which protects the transparent acrylic resin sheet used as a lower side from an organic solvent after transfer can be provided.
[0030]
As the main component of the two-component curable acrylic resin, one or more functional groups having reactivity with a silane coupling agent such as a hydroxyl group or a carboxyl group are introduced into the molecule, usually two or more. Acrylic resin can be used.
For example, when the functional group is two or more hydroxyl groups, the acrylic resin can also be called an acrylic polyol. As such a hydroxyl group-containing acrylic resin, for example, methyl (meth) acrylate, ethyl (meth) acrylate, (n-propyl) (meth) acrylate, isopropyl (meth) acrylate, (meth) acrylic acid- One or more of (meth) acrylic acid alkyl ester monomers such as n-butyl, isobutyl (meth) acrylate, octyl (meth) acrylate, ethylhexyl (meth) acrylate, and (meth) acrylic Of (meth) acrylic acid ester monomers having a hydroxyl group in the molecule such as acid-2-hydroxyethyl, (meth) acrylic acid-2-hydroxypropyl, (meth) acrylic acid-2-hydroxy-3-phenoxypropyl, etc. Copolymers obtained by copolymerizing one or more and, if necessary, other vinyl monomers such as styrene monomers. Coalescence, and the like. In addition, (meth) acrylic acid means acrylic acid or methacrylic acid.
Moreover, when introduce | transducing a carboxyl group, the copolymer etc. which copolymerized carboxyl group-containing vinyl monomers, such as acrylic acid and methacrylic acid, are used.
[0031]
In addition to the alkoxy group, a known silane coupling agent having an amino group, a vinyl group, an epoxy group, a mercapto group, a chloro group, or the like may be used depending on the application as the silane coupling agent serving as a curing agent. It ’s fine.
For example, γ-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropyldimethylmethoxysilane, γ-methacryloxypropyltriethoxysilane, γ-methacryloxy Propyldimethylethoxysilane, γ-acryloxypropyltrimethoxysilane, γ-acryloxypropylmethyldimethoxysilane, γ-acryloxypropyldimethylmethoxysilane, γ-acryloxypropyltriethoxysilane, γ-acryloxypropylmethyldiethoxysilane , Γ-acryloxypropyldimethylethoxysilane, vinyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysila Etc.
In addition, the addition amount of the silane coupling agent as a hardening | curing agent is about 5-15 mass% with respect to the acrylic resin used as a main ingredient.
[0032]
The inorganic or organic powder filler added to the reinforcing layer is for further improving the scratch resistance. The powder filler is harder than the resin of the reinforcing layer and may be an organic substance such as resin beads in order to impart scratch resistance due to its hardness, but more preferably an inorganic substance. Examples of inorganic powder fillers include oxides of metals such as aluminum, titanium, silicon, zirconium, and magnesium, glass, calcium carbonate, and diamond. Specifically, for example, alumina such as α-alumina. Examples of such powder fillers include those having an average particle size of 2 to 3 μm and a particle size distribution having a minimum value of 0.01 μm and a maximum value of 6 μm (specific examples include spherical α-alumina). From the viewpoint of obtaining good scratch resistance. In addition, the particle shape of the powder filler may be a spherical shape, a scale shape, a polyhedron shape, or the like.
In addition, although the addition amount of a powder filler is based on a required physical property, it is about 1-50 mass parts normally with respect to 100 mass parts of resin parts, More preferably, it is about 5-30 mass parts.
In addition, since the two-component curable acrylic resin uses a silane coupling agent as a curing agent, when the above metal oxide is used as a powder filler, the silane coupling agent also reacts with the powder filler. Thus, a reinforcing layer in which the filler is firmly bonded and dispersed in the binder resin can be obtained.
[0033]
In the reinforcing layer, in addition to the powder filler, lubricants such as silicone resin and wax, UV stabilizers such as benzotriazole, benzophenone, and fine cerium oxide, and light stabilizers such as hindered amine radical scavengers Well-known additives such as extender pigments and colorants can be used as appropriate. These can also be used as appropriate in the release layer.
[0034]
In addition, formation of a reinforcement layer uses well-known coating methods, such as roll coating, or gravure printing, etc. using the coating liquid (or ink) containing the two-component curable acrylic resin which consists of the said silane coupling agent and an acrylic resin. What is necessary is just to form by a well-known printing method. Moreover, the thickness of a reinforcement layer should just be a thickness according to a use, and usually shall be about 2-20 micrometers.
[0035]
(Adhesive layer)
The adhesive layer 5 is a layer for adhering and laminating the reinforcing layer 4 and the transparent acrylic resin sheet 6. More specifically, the above-described support sheet, release layer, and reinforcing layer are laminated. This is a layer used for laminating and bonding and laminating a pattern layer on a transparent acrylic resin sheet on which a laminated sheet having the above structure is a process sheet.
[0036]
Therefore, as the adhesive layer 5, for example, a conventionally known thermoplastic resin having heat-fusibility can be used. Such thermoplastic resins are, for example, thermoplastic resins such as vinyl acetate resin, vinyl chloride-vinyl acetate copolymer, acrylic resin, thermoplastic polyester resin, polyamide resin, ionomer, and chlorinated polyolefin. The adhesive layer may be formed using a coating liquid (or ink) containing such a resin by a known coating method such as roll coating or a known printing method such as gravure printing. The thickness of the adhesive layer is not particularly limited, but is usually about 1 to 10 μm.
[0037]
[Transparent acrylic resin sheet]
The transparent acrylic resin sheet 6 is a resin sheet made of a transparent thermoplastic acrylic resin. Examples of the thermoplastic acrylic resin include polymethyl (meth) acrylate, polyethyl (meth) acrylate, polybutyl (meth) acrylate, methyl (meth) acrylate-butyl (meth) acrylate copolymer, and ethyl (meth) acrylate-butyl. Acrylic resins such as a (meth) acrylate copolymer and a methyl (meth) acrylate-styrene copolymer (where (meth) acrylate means acrylate or methacrylate) are used alone or in a mixture of two or more. As the transparent acrylic resin sheet, a single layer sheet made of these acrylic resins or a laminate sheet having two or more layers can be used.
In addition, although the thickness of a transparent acrylic resin sheet is not specifically limited, Although it depends on a use, it is about 30-500 micrometers, and generally is about 50-250 micrometers.
[0038]
Moreover, the transparency of a transparent acrylic resin sheet is non-colored transparent, colored transparent, translucent, etc. In addition, in order to color a transparent acrylic resin sheet, what is necessary is just to knead well-known coloring agents etc. which are described by the pattern layer mentioned later in resin.
Further, the front side surface and the back side surface of the transparent acrylic resin sheet may be subjected to surface easy-adhesion treatment such as corona discharge treatment, plasma treatment, etc., as necessary, in order to improve adhesion with other layers.
[0039]
[Picture Layer] The picture layer 7 is formed on at least the back side surface of the transparent acrylic resin sheet 6. In addition to this, a pattern layer may be additionally formed between the reinforcing layer 4 and the adhesive layer 5 as in the pattern layer 7A of the transfer sheet S with simultaneous injection molding illustrated in FIG. The pattern layer 7 is usually formed by printing or the like on the transparent acrylic resin sheet 6 in a state before the adhesive layer 5 is laminated. On the other hand, the additional pattern layer 7A is usually formed on the support sheet 1 in order with a release layer.3, Reinforcement layer4Is formed by printing or the like, and subsequently, the adhesive layer 5 is formed.
[0040]
The pattern layer 7 (or 7A) is typically a layer that represents a pattern such as a pattern or a character. The pattern is arbitrary, but for example, one kind of wood grain pattern, stone pattern, sand grain pattern, cloth pattern, leather pattern, tiled pattern, brickwork pattern, geometric figure, character, symbol, or solid solid Or the pattern etc. which combined 2 or more types are used. In the case of the pattern layer 7A provided on the support sheet side with respect to the transparent acrylic resin sheet, the pattern layer is usually formed in a pattern rather than a solid surface.
[0041]
The pattern layer 7 can be formed by a known printing method. The printing is, for example, gravure printing, silk screen printing, offset printing, or the like. Further, in the case of a solid surface, it may be formed by a known coating method such as gravure coating or roll coating.
[0042]
The ink (or coating liquid) used for printing (or coating) may be appropriately selected from known ones in consideration of adhesiveness and the like. For example, as the binder resin of the ink (or coating liquid), an acrylic resin, a vinyl chloride-vinyl acetate copolymer, a polyester resin, a polyurethane resin, or the like is used alone or in combination of two or more. Examples of the colorant contained in the ink (or coating liquid) include inorganic pigments such as titanium white, zinc white, carbon black, iron black, petal, cadmium red, ultramarine, cobalt blue, yellow lead, and titanium yellow. , Organic pigments such as phthalocyanine blue, indanthrene blue, isoindolinone yellow, quinacridone red and perylene red, metal powders such as aluminum and brass, metal pigments such as scales, pearl luster such as titanium dioxide-coated mica powders and scales (Pearl) pigments or dyes are used. If a metallic pigment or a pearlescent (pearl) pigment is used, a glittering picture layer can be formed.
[0043]
In addition, as a pattern layer, the metal thin film layer etc. which vapor-deposited aluminum, chromium, etc., for example, formed in the whole surface or partially may be sufficient.
Moreover, as a pattern layer, functional layers, such as a magnetic body layer and a conductive layer, may be used in addition to the expression of a pattern design such as grain.
[0044]
[Adhesive layer]
As the adhesive layer 8, a known resin such as a thermoplastic resin or a thermosetting resin can be used as a heat-sensitive adhesive, for example, depending on the resin molding material. In the thermoplastic resin, for example, vinyl acetate resin, vinyl chloride-vinyl acetate copolymer, acrylic resin, thermoplastic polyester resin, polyamide resin, ionomer, chlorinated polyolefin resin, thermoplastic urethane resin, rubber resin, etc. Alternatively, a mixture of two or more kinds is used. As the thermosetting resin, phenol resin, urethane resin such as blocked isocyanate curing type, epoxy resin, or the like is used.
The adhesive layer is formed by known printing or coating methods such as gravure printing, roll coating, and the like using an adhesive made of these resins. The thickness of the adhesive layer is not particularly limited, but is usually about 1 to 100 μm.
[0045]
Molded product with picture:
The illustrated molded article according to the present invention is formed by painting the surface of the resin molded article 9 by the transfer of the above-mentioned injection molding simultaneous painting transfer sheet, as exemplified by one form in the sectional view of FIG. It is a molded product having a configuration in which a concavo-convex pattern e is provided on the surface. The picture-formed molded product P has a configuration in which the transfer layer 2 portion of the transfer sheet is laminated on the resin molded product 9 with the adhesive layer 8 side facing the resin molded product 9 side. And the molded article P with a picture of FIG. 2 (B) is the elements on larger scale which further detailed one form of the transfer layer part. The structure of the molded article P with a picture shown in FIG. 2 (B) is, as the transfer layer 2 on the resin molding 9, in order from the resin molding 9 side, an adhesive layer 8, a picture layer 7, a transparent acrylic resin sheet 6, An uneven pattern e is formed on the surface of the adhesive layer 5, the reinforcing layer 4, the release layer 3, and the transfer layer 2 made of these. The transfer layer 2 illustrated in FIG. 2B can be formed by transferring the transfer sheet S for simultaneous injection molding with the structure illustrated in FIG.
The transfer sheet for injection-molded simultaneous painting can be preferably transferred by the injection-molded simultaneous painting method in a transfer form.
[0046]
[Injection resin]
In addition, as injection resin used as a resin molding, there is no restriction | limiting in particular fundamentally and well-known resin may be sufficient. It may be selected according to the required physical properties and cost of the product. Examples of the thermoplastic resin include ABS (acrylonitrile-butadiene-styrene copolymer) resin, styrene resin, acrylic resin, vinyl chloride resin, polycarbonate resin, and polyolefin resin. Further, in the case of a curable resin, it is a two-component curable resin, for example, an uncured resin solution such as a urethane resin, an unsaturated polyester resin, or an epoxy resin. The thermoplastic resin is melted by heating and injected in a fluid state, and the curable resin (its uncured product) is injected at room temperature or appropriately heated and injected in a fluid state.
Note that as the injection resin, a resin colored by adding a colorant may be used as appropriate according to the application. As the colorant, a known colorant as described in the base material sheet may be used. In addition, the injection resin contains various known additives such as silica, alumina, talc, calcium carbonate, aluminum hydroxide and other inorganic powders, fillers such as glass fibers, stabilizers, lubricants, and the like as necessary. .
[0047]
[Molded product shape]
The shape of the molded article with a picture is a non-planar surface such as an uneven surface, or a planar solid object. The shape of the molded article with a picture is arbitrary such as a plate shape (a flat plate, a curved plate, etc.), a columnar shape, a three-dimensional solid object and the like.
[0048]
Injection molding simultaneous painting method:
Here, an injection molding simultaneous painting method, which is a suitable painting method as the application of the above-described injection molding simultaneous painting transfer sheet or as a manufacturing method of the above-mentioned painting molded product, will be described. In addition, although the injection molding simultaneous painting method is roughly classified into a laminate form and a transfer form, the form here is a transfer form. As described in Japanese Patent Publication No. 2-4080, Japanese Patent Application Laid-Open No. 6-315950, and the like, the injection molding simultaneous painting method in the transfer form is inserted between the male and female molds, as described in JP-B-6-315950 and the like. Both molds are clamped, a resin in a fluid state is injected and solidified in a cavity formed by both molds, and a transfer sheet for simultaneous injection molding is once laminated on the surface simultaneously with the molding of the resin molding, In this method, only the support sheet of the transfer sheet is peeled off, and the transfer layer is transferred onto the surface of the resin molded product, whereby a picture is attached to obtain a picture-formed product.
[0049]
In the injection molding simultaneous painting method, even when there is no preheating of the injection molding simultaneous painting transfer sheet, the injection molding simultaneous painting transfer sheet receives heat pressure from the injection resin. Accordingly, the injection molding simultaneous painting transfer sheet may be preformed or not. Moreover, the pre-heating of the transfer sheet for simultaneous injection-molding may or may not be performed. Note that, at the time of preliminary molding, the transfer sheet for simultaneous painting with injection molding is usually preheated.
[0050]
Needless to say, it is preferable to perform preliminary molding when the transfer sheet for injection-molded simultaneous painting has a large aperture. On the other hand, when the injection-molded simultaneous painting transfer sheet has a small aperture, the injection-molded simultaneous painting transfer sheet may be molded by the resin pressure and resin heat of the injected resin in a fluid state. At this time, if the aperture is shallow, the transfer sheet for simultaneous injection molding painting may be formed only by resin pressure and resin heat of the resin in a fluid state filled in the mold at the same time as resin injection without pre-molding. Further, even when a transfer sheet for injection molding simultaneous painting is molded by resin pressure and resin heat, the injection molding simultaneous painting transfer sheet may be heated only using the resin heat of the injection resin and not preheated. In addition, the preforming of the transfer sheet for injection molding simultaneous painting is usually performed by using the injection mold as a vacuum mold. Before the transfer sheet for simultaneous injection molding painting is supplied between the molds, the injection molding mold is used. Preliminary molding (offline preliminary molding) may be used in which a transfer sheet for simultaneous injection molding is vacuum-molded with another vacuum molding die. However, the pre-molding is preferably performed by using both the injection mold and the vacuum mold in that the transfer sheet for simultaneous injection molding can be laminated efficiently and accurately. However, when the preformed injection-molded simultaneous painting transfer sheet is manufactured in advance at another location, the preforming is preferably in the form of off-line preforming. In the description of the present invention, vacuum forming includes vacuum / pressure forming.
[0051]
With reference to the conceptual diagram of FIG. 3, the injection molding simultaneous painting method will be described in one form. In the embodiment described here, before the mold is clamped, the transfer sheet for simultaneous painting with injection molding is softened by heating between the molds and pre-molded by vacuum molding with an injection mold, and then the mold is clamped and the resin is injected. It is a form to do.
Moreover, this form is a more preferable form when the drawing of the injection molding simultaneous painting transfer sheet is deep in the various combinations of pre-molding and preheating of the injection molding simultaneous painting transfer sheet.
[0052]
First, as shown in FIG. 3A, the injection mold includes a mold (male mold) Ma having a runner and a gate (gate) communicating with the injection nozzle, and a suction hole 41 on the cavity surface. A pair of molds (female molds) Mb that also serves as a sheet preforming mold is used. These molds are made of metal such as iron or ceramics. In the mold open state, a transfer sheet S for injection molding simultaneous painting is supplied between the molds Ma and Mb, and the transfer sheet S for simultaneous injection molding painting is pressed to the mold Mb by a sheet clamp 42 having a frame shape in plan view. And fix. At this time, it is a matter of course that the adhesive layer side of the simultaneous injection molding transfer sheet is the injection resin side on the right side of the drawing. Next, the transfer sheet for simultaneous painting with injection molding is softened by heating with a heater (not shown) inserted between both molds as appropriate. The heating is, for example, non-contact radiation heating, but may be conduction heating by contact. Then, it is sucked from the suction holes and vacuum-formed, and the transfer sheet for simultaneous injection-molding painting is preformed along the cavity surface of the mold Mb. Next, the heater is retracted from both molds, both molds are clamped as shown in FIG. 3B, and a resin formed in a fluid state such as a heat-melted state is filled in a cavity formed by both molds. Then, after the resin is solidified by cooling or the like, it is a painting method in which a molded product is obtained by opening the mold and taking out the molded product.
In this case, since it is a transfer form, the molded product is taken out with the support sheet left on the mold Mb side, or the molded product is taken out with all layers of the transfer sheet for simultaneous injection molding painted. Thereafter, the support sheet is peeled off to obtain a picture-molded article in which only the transfer layer is laminated and pictured.
[0053]
Here, the injection molding simultaneous painting method, for example, as an example in the form of pre-molding the injection molding simultaneous painting transfer sheet by using the injection mold as a vacuum mold, is described separately for each process. There is a method of simultaneous injection molding with the following steps. That is, a sheet supply step of supplying a transfer sheet for simultaneous injection-molding painting onto a parting surface of a female mold when a pair of males and females is in an open state; A clamping step for fixing and holding on the surface, a stretching step (preliminary molding step) for stretching the transfer sheet for simultaneous painting with the injection molding along the cavity surface of the female mold, and a mold for clamping the female mold and the male mold A fastening step, and an injection step of injecting, filling, and solidifying a fluid resin in a cavity formed by a female die and a male die, and laminating and integrating the resin molding and the transfer sheet for simultaneous injection molding with pictures There is an injection molding simultaneous painting method in which a mold opening process for separating a female mold and a male mold and a take-out process for taking out a molded product with a resin molded product painted with a transfer sheet for simultaneous painting with injection molding are performed in this order.
In the take-out step, as described above, the picture-formed molded product is taken out with the support sheet left on the female mold side, or the molded product is put in a state where all layers of the simultaneous injection-molded transfer sheet are laminated. After taking out, a support body sheet | seat is peeled and only the transfer layer is laminated | stacked and the molded article with a picture is obtained.
[0054]
【Example】
Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
[0055]
[Example 1]
A transfer sheet S for injection-molded simultaneous painting having the structure as shown in FIG. 1A was produced as follows.
[0056]
First, as a raw material sheet 1A of the support sheet 1, a 26 μm thick biaxially stretched polyethylene terephthalate film is prepared, and a concavo-convex pattern shaping layer 1B for shaping a concavo-convex pattern of a wood grain conduit groove pattern on one side thereof, Gravure printing ink using thermosetting polyester resin consisting of polyester resin, amino alkyd resin, and melamine resin mixed resin to form pattern so that material sheet surface is exposed, material sheet 1A and uneven pattern A support sheet 1 comprising the shaping layer 1B was produced.
[0057]
Next, as a part of the transfer layer 2, first, the release layer 3, the reinforcing layer 4, and the adhesive layer 5 are formed on the entire surface by gravure printing in this order on the surface of the support sheet 1 on the uneven pattern shaping layer 1 B side. Thus, a process sheet was obtained.
In addition, the said peeling layer 3 was formed in thickness of 2 micrometers using the acrylic resin which has a polymethylmethacrylate as a main component. Further, the reinforcing layer 4 has an average particle diameter of 2.5 μm with respect to 100 parts by mass of a two-part curable acrylic resin in which 12 parts by mass of a silane coupling agent as a curing agent is added to 100 parts by mass of the main component of the acrylic resin. In addition, 30 parts by mass of spherical α-alumina powder was added, and the ink was added with an appropriate amount of an organic solvent to form a thickness of 4 μm. Further, the adhesive layer 5 was formed to a thickness of 4 μm using a mixed resin of 1: 1 mass ratio of acrylic resin and vinyl chloride-vinyl acetate copolymer.
[0058]
On the other hand, with respect to the transparent acrylic resin sheet 6 having a thickness of 125 μm, a wood grain pattern is formed by coloring ink using a one-to-one mass ratio mixed resin of acrylic resin and vinyl chloride-vinyl acetate copolymer on the back side. Similarly, the adhesive layer 8 having a thickness of 3 μm was formed by gravure printing in this order using the pattern layer 7 and a 1: 1 mass ratio mixed resin of acrylic resin and vinyl chloride-vinyl acetate copolymer.
[0059]
And the process sheet | seat is heat-laminated using the laminating roller with the adhesive layer with respect to the surface used as the front side of the transparent acrylic resin sheet in which the said pattern layer and the adhesive bond layer were formed, FIG. 1 (A) Thus, a desired transfer sheet S for simultaneous injection-molding was obtained.
[0060]
Next, the surface of the resin molded product 9 as shown in FIGS. 2 (A) and 2 (B) is obtained by subjecting the sheet for simultaneous injection molding to the injection molding simultaneous painting method as shown in FIG. 3 using ABS resin as the injection molding resin. Then, the transfer layer 2 was transferred and laminated, and a picture-formed molded product P having a configuration in which the uneven surface e was provided on the surface of the molded product was produced.
[0061]
[Example 2]
A transfer sheet S for simultaneous injection molding with a structure as shown in FIG. 1B was prepared as follows.
[0062]
First, a biaxially stretched polyethylene terephthalate film having a thickness of 26 μm is prepared as a material sheet 1A of the support sheet 1, and a concavo-convex pattern forming layer 1B for forming an concavo-convex pattern of an abstract pattern on one side thereof is formed using a polyester resin. The material sheet 1A and the concavo-convex pattern are formed by gravure printing an ink using a thermosetting polyester resin composed of a mixed resin of amino alkyd resin and melamine resin so that the material sheet surface is exposed. A support sheet 1 composed of the layer 1B was produced.
[0063]
Next, on the surface of the support sheet 1 on the side of the concavo-convex pattern shaping layer 1B, as a part of the transfer layer 2, first, the release layer 3, the reinforcing layer 4, the abstract pattern layer 7A, and the adhesive layer 5 are provided. The process sheet | seat was obtained in order by gravure printing.
The release layer 3 was formed to a thickness of 2 μm on the entire surface using an acrylic resin mainly composed of polymethyl methacrylate. Further, the reinforcing layer 4 has an average particle diameter of 2.5 μm with respect to 100 parts by mass of a two-part curable acrylic resin in which 12 parts by mass of a silane coupling agent as a curing agent is added to 100 parts by mass of the main component of the acrylic resin. In addition, 30 parts by mass of spherical α-alumina powder was added, and an ink having an appropriate amount of organic solvent added thereto was used to form a 4 μm thick film on the entire surface. Further, the pattern layer 7A was partially formed in a pattern using a colored ink made of a mixed resin of acrylic resin and vinyl chloride-vinyl acetate copolymer in a 1: 1 mass ratio. The adhesive layer 5 was formed to a thickness of 4 μm on the entire surface by using a mixed resin having a 1: 1 mass ratio of acrylic resin and vinyl chloride-vinyl acetate copolymer.
[0064]
On the other hand, with respect to the transparent acrylic resin sheet 6 having a thickness of 125 μm, the surface on the back side thereof has a glittering property including a one-to-one mass ratio mixed resin of acrylic resin and vinyl chloride-vinyl acetate copolymer and a luster pigment. The adhesive layer 8 having a thickness of 3 μm is gravure-printed in this order using a solid pattern pattern layer 7 and a mixed resin of 1: 1 mass ratio of acrylic resin and vinyl chloride-vinyl acetate copolymer. Formed.
[0065]
And the process sheet | seat is heat-laminated using the laminating roller with the adhesive layer with respect to the surface used as the front side of the transparent acrylic resin sheet in which the said pattern layer 7 and the adhesive bond layer 8 were formed, FIG. As shown in B), a desired transfer sheet S for simultaneous injection-molding was obtained.
Then, this injection molding simultaneous painting sheet is applied to the injection molding simultaneous painting method in the same manner as in Example 1, and the transfer layer is transferred and laminated on the surface of the resin molded product, thereby providing a concavo-convex pattern on the surface of the molded product. A picture-molded article having the structure described above was produced. In addition, the molded article with a picture had a deep design feeling due to the glittering pattern layer under the transparent acrylic resin sheet.
[0066]
[Comparative Example 1]
In Example 1, a transfer sheet for simultaneous injection molding was prepared in the same manner as in Example 1 except that the formation of the reinforcing layer was omitted when the transfer sheet for simultaneous injection molding was prepared. A molded article with a picture was produced in the same manner as in Example 1 by using this transfer sheet for simultaneous painting with an injection molding.
[0067]
[Performance evaluation]
The scratch resistance was evaluated for the molded articles with pictures obtained in Examples and Comparative Examples.
Scratch resistance is determined by rubbing the surface of a molded article with a steel wool (made by Nippon Steel Wool Co., Ltd., trade name “Bonstar”, product number 0000) several times with a load of 9.8 N (1 kgf). The presence or absence of abnormalities was visually observed and evaluated. As a result, in Comparative Example 1, scratches were observed on the surface after 3 reciprocations, but in Examples 1 and 2, scratches were observed on the surface only after 50 reciprocations, and the scratch resistance was good. It was.
[0068]
【The invention's effect】
According to the present invention, it is possible to impart scratch resistance as well as impart an uneven pattern and a feeling of painting.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating an example of a transfer sheet for simultaneous injection-molding with an image according to the present invention.
FIG. 2 is a conceptual diagram illustrating an injection molding simultaneous painting method used in the present invention in one form thereof.
FIG. 3 is a cross-sectional view illustrating one embodiment of a molded article with a picture according to the present invention.
[Explanation of symbols]
1 Support sheet
1A material sheet
1B Irregular pattern shaping layer
2 Transfer layer
3 Release layer
4 Reinforcing layer
5 Adhesive layer
6 Transparent acrylic resin sheet
7 Pattern layer
7A pattern layer
8 Adhesive layer
9 Resin molding
41 Suction hole
42 Sheet clamp
e Uneven pattern
Ma injection mold (male mold)
Mb injection mold (female)
P Molded product with picture
S Transfer sheet for simultaneous injection molding

Claims (2)

転写層側に凹凸模様賦形層を有する支持体シートに、転写層として順次、剥離層、補強層、接着層、透明アクリル樹脂シート、絵柄層、接着剤層が積層されてなる射出成形同時絵付用転写シートであって、上記補強層に無機又は有機の粉末充填剤が添加されており、該補強層がアクリル樹脂をシランカップリング剤で硬化させる2液硬化型アクリル樹脂の硬化物からなり、かつ、透明な層で形成され、前記絵柄層を透視可能であり、かつ、前記接着層が熱融着性を有する、酢酸ビニル樹脂、塩化ビニル−酢酸ビニル共重合体、アクリル樹脂、熱可塑性ポリエステル樹脂、ポリアミド樹脂、アイオノマー、塩素化ポリオレフィンの熱可塑性樹脂であることを特徴とする射出成形同時絵付用転写シート。Simultaneous injection-molding with a support sheet having a concavo-convex pattern shaping layer on the transfer layer side, in which a release layer, a reinforcing layer, an adhesive layer, a transparent acrylic resin sheet, a pattern layer, and an adhesive layer are sequentially laminated as a transfer layer An inorganic or organic powder filler is added to the reinforcing layer, and the reinforcing layer comprises a cured product of a two-component curable acrylic resin that cures the acrylic resin with a silane coupling agent, and is formed of a transparent layer, the Ri pattern layer capable perspective der, and the having the adhesive layer is heat-fusible, vinyl acetate resins, vinyl chloride - vinyl acetate copolymer, acrylic resins, thermoplastic A transfer sheet for simultaneous painting with injection molding, which is a thermoplastic resin of polyester resin, polyamide resin, ionomer, or chlorinated polyolefin . 請求項1記載の射出成形同時絵付用転写シートの転写により、該転写シートの転写層が樹脂成形物の表面に積層されてなることを特徴とする絵付成形品。  A molded article with a picture, wherein a transfer layer of the transfer sheet is laminated on the surface of a resin molded product by transferring the transfer sheet for simultaneous injection-molding with a picture according to claim 1.
JP2002121968A 2002-04-24 2002-04-24 Transfer sheet for simultaneous painting with injection molding and molded product with painting Expired - Fee Related JP4357795B2 (en)

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JP5088860B2 (en) * 2006-11-30 2012-12-05 日本写真印刷株式会社 Sheet for simultaneous decorative decoration and method for producing decorative molded product using the same
JP5301782B2 (en) * 2007-03-14 2013-09-25 日本写真印刷株式会社 Decorative sheet for injection molding and resin molded product
JP5100608B2 (en) * 2008-10-27 2012-12-19 レノボ・シンガポール・プライベート・リミテッド Injection resin transfer substrate and method for producing resin molded product
KR101218265B1 (en) * 2008-10-30 2013-01-03 (주)엘지하우시스 Transfer film for inmold injection
WO2011074602A1 (en) * 2009-12-18 2011-06-23 株式会社麗光 Decorated molded article, process for producing same, and laminate used therefor
JP5309108B2 (en) * 2010-10-06 2013-10-09 日本写真印刷株式会社 Transfer sheet for forming fingerprint-resistant hard coat transfer surface
JP5667526B2 (en) * 2011-06-22 2015-02-12 東洋機械金属株式会社 Method of performing in-mold molding of complex shape, transfer sheet used for in-mold molding, and resin molded product formed by the method
JP6011925B2 (en) * 2012-10-02 2016-10-25 大日本印刷株式会社 Thermal transfer foil and decorative molded body using the same

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