JP4121759B2 - Decorative molding sheet and decorative molded product - Google Patents

Decorative molding sheet and decorative molded product Download PDF

Info

Publication number
JP4121759B2
JP4121759B2 JP2002077871A JP2002077871A JP4121759B2 JP 4121759 B2 JP4121759 B2 JP 4121759B2 JP 2002077871 A JP2002077871 A JP 2002077871A JP 2002077871 A JP2002077871 A JP 2002077871A JP 4121759 B2 JP4121759 B2 JP 4121759B2
Authority
JP
Japan
Prior art keywords
layer
resin
sheet
decorative
decorative molding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2002077871A
Other languages
Japanese (ja)
Other versions
JP2003266615A (en
Inventor
浩之 阿竹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dai Nippon Printing Co Ltd
Original Assignee
Dai Nippon Printing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dai Nippon Printing Co Ltd filed Critical Dai Nippon Printing Co Ltd
Priority to JP2002077871A priority Critical patent/JP4121759B2/en
Publication of JP2003266615A publication Critical patent/JP2003266615A/en
Application granted granted Critical
Publication of JP4121759B2 publication Critical patent/JP4121759B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Injection Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、各種物品の表面加飾に使用する加飾成形用シートと、それを用いた加飾成形品に関する。
【0002】
【従来の技術】
従来から、樹脂成形物の表面を加飾した加飾成形品が各種用途で使用されている。例えば、特公昭50−19132号公報、特公昭43−27488号公報等に開示の射出成形同時加飾方法等では、加飾成形用シートを射出成形の雌雄両型間に配置した後、溶融樹脂をキャビティ内に射出充填し固化させることで、樹脂成形物の成形と同時にその表面に加飾成形用シートを接着積層して一体化した加飾成形品を得る方法を開示している。
【0003】
また、樹脂成形物に使用する樹脂材料としては、一般的には、アクリロニトリル−ブタジエン−スチレン共重合体樹脂(以下、ABS樹脂とも呼ぶ)、アクリル樹脂、ポリカーボネート樹脂等が多かった。この為、加飾成形用シートは、樹脂成形物側となる裏面側の基材シート(裏面シート)には、これら樹脂との密着性や成形性等を考慮して、ABS樹脂シートを用いることが多い。
一方、加飾成形品の意匠として塗装感が要求される場合には、透明性に優れ、また成形性や耐候性、耐擦傷性等も良好であるアクリル樹脂を用いた透明な樹脂シートを表面側の基材シート(表面シート)に使用することが多い。そして更に、高意匠な表現を可能とする為に、通常は、表面シート(第一層)と裏面シート(第二層)との間には絵柄層を印刷形成し、表面シートと裏面シートとを接着剤でラミネートしてきた。
【0004】
例えば、特開2001−232660号公報では、表面側から順に、アクリル樹脂からなる透明な表面シート(第一層)、バインダーの樹脂がアクリル樹脂と塩化ビニル−酢酸ビニル共重合体との混合物からなる絵柄層、バインダーの樹脂がアクリル樹脂と塩化ビニル−酢酸ビニル共重合体との混合物からなる接着剤層、ABS樹脂から成る着色隠蔽性の裏面シート(第二層)を積層した構成の加飾成形用シートが開示されている。
【0005】
【発明が解決しようとする課題】
しかしながら、上記の様に、アクリル樹脂の表面シートからなる第一層と、ABS樹脂の裏面シートからなる第二層とを積層した構成の加飾成形用シートでは、ABS樹脂が吸湿しやすく経時的に水を含み、加飾成形用シートが真空成形時に加熱された際に、水分が気化して第一層と第二層との間で気泡が発生し膨れることがあった。
上記シート成形時の膨れの問題は、第二層とする裏面シートの樹脂を、ABS樹脂に代えて、吸湿しにいく樹脂であるポリプロピレン樹脂を使用すれば、解消するが、今度はポリプロピレン樹脂では、加飾成形用シートとABS樹脂からなる樹脂成形物との密着性が低下するという問題が新たに発生する。
【0006】
すなわち、本発明の課題は、ABS樹脂成形物に加飾成形用シートを積層して加飾する際に、シート成形時の膨れを防ぐことであり、それを実現する加飾形成用シートを提供することである。また、この様な加飾成形用シートが密着性良く積層した如きの加飾成形品を提供することである。
【0007】
【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、本発明の加飾成形用シートでは、表側から順に、透明な熱可塑性樹脂からなる第一層と、ポリオレフィン系樹脂からなる第二層と、アクリロニトリル−ブタジエン−スチレン共重合体樹脂とポリオレフィン系樹脂と相溶化剤としてエポキシ化SBS(スチレン−ブタジエン−スチレンブロック共重合体のブタジエン部分の不飽和二重結合の一部をエポキシ化した化合物)との混合樹脂からなる第三層が、積層されてなり、且つ第二層と第三層とは接して積層されてなる構成とした。
【0008】
この様な構成として、第二層にはポリオレフィン系樹脂を使用する為に、ABS樹脂の吸湿性に起因するシート成形時の膨れを解消できる。しかも第二層の裏側には、アクリロニトリル−ブタジエン−スチレン共重合体樹脂(ABS樹脂)をポリオレフィン系樹脂と相溶化剤との混合樹脂として使用した第三層を設けてある為に、ABS樹脂使用時の上記膨れの問題を回避しつつ、ABS樹脂からなる樹脂成形物に対する密着性も確保できる。従って、ABS樹脂に対する加飾成形用シートの密着性と、膨れ解消とを両立できる。また、第三層はポリオレフィン系樹脂との混合樹脂の層として第二層と接した構成とする為に、ポリオレフィン系樹脂の第二層との層間の密着性も確保できる。そして、表面側の第一層は、透明である為に塗装感も得られる。
また、本発明の加飾成形用シートは、ポリオレフィン系樹脂がポリプロピレン樹脂であり、アクリロニトリル−ブタジエン−スチレン共重合体樹脂/ポリオレフィン系樹脂/相溶化剤の割合が質量比で、100/30〜80/5〜20である構成とできる。
【0009】
また、本発明の加飾成形用シートは、上記構成の加飾成形用シートに於いて更に、第二層と第三層とが2層共押出法で積層されてなる構成とした。
【0010】
この様な構成とすることで、第三層は第二層の成膜と同時に形成できるので、既に成膜済みの第二層に押出法等で第三層をラミネートする追加的な工程が不要で、容易且つ低コストで製造できる加飾成形用シートとなる。また、第三層と第二層との層間密着性もより確実に得やすい。
また、本発明の加飾成形用シートは、第二層を表層と裏層の2層構成とできる。
また、本発明の加飾成形用シートは、第二層の表層と第二層の裏層と第三層とが、3層共押出法で積層されてなる構成とできる。
【0011】
また、本発明の加飾成形用シートは、上記いずれかの構成の加飾成形用シートに於いて更に、第一層の裏面に、絵柄層及び接着剤層がこの順に積層されてなる構成とした。
【0012】
この様な構成とすることで、絵柄層によって高意匠にでき、また、接着剤層によって、絵柄層形成済みの第一層を、第二層と、或いは第二層及び第三層と、密着性良く積層できる。
【0013】
また、本発明の加飾成形品は、アクリロニトリル−ブタジエン−スチレン共重合体樹脂から成る樹脂成形物の表面に、上記いずれかの構成の加飾成形用シートが、その第三層側を該樹脂成形物側に向けて積層されてなる構成とした。
【0014】
この様に、アクリロニトリル−ブタジエン−スチレン共重合体樹脂(ABS樹脂)の樹脂成形物上に、上記の如き特定構成の加飾成形用シートを、積層した構成とすることで、ABS樹脂成形物と加飾成形用シートの密着性が良く、加飾成形用シート部分でのシート成形時の膨れも無い等の、上記加飾成形用シートで得られるそれぞれの効果を享受できる。
【0015】
【発明の実施の形態】
以下、本発明の実施の形態を説明する。
【0016】
概要
先ず、本発明の加飾成形用シートの構成例の幾つかを、図1の断面図で例示する。図1(A)に示す加飾成形用シートSは、表側から順に、透明な熱可塑性樹脂からなる第一層1、絵柄層4、接着剤層5、ポリオレフィン系樹脂からなる第二層2、更にこの第二層2に接する様に、アクリロニトリル−ブタジエン−スチレン共重合体樹脂とポリオレフィン系樹脂との混合樹脂からなる第三層3が積層された構成である。なお、第二層2と第三層3とは、工程増を避ける点及び層間密着性の点等で、好ましくは2層共押出法で積層する。なお、絵柄層4、接着剤層5は省略された構成でも良いが、意匠性、層間密着性等の点では設けるのが好ましく、通常はこれらを設けた構成とする。
【0017】
次に、図1(B)に示す加飾成形用シートSは、図1(A)の構成に対して更に、その第二層2を表層2Aと裏層2Bとの2層構成とした例である。2層構成の具体例としては、例えば、第二層2には、通常、タルク等の充填剤を成形性等の調整の為に添加するが、充填剤は表層2Aには加せず裏層2Bに添加した構成である。
【0018】
次に、本発明の加飾成形品の構成を、図2の断面図で例示する。図2で示す加飾成形品Pは、ABS樹脂からなる樹脂成形物6の表面に、図1の断面図で例示の如き構成の加飾成形用シートSが、その第三層3側が樹脂成形物側となる向きで積層された如き構成の加飾成形品である。同図では、この加飾成形用シートSの部分の層構成の図示は省略してあるが、その部分は、図1の断面図で例示の加飾成形用シートSと同様である。
【0019】
加飾成形用シート
先ず、加飾成形用シートについて、表面側の第一層から順に説明する。
【0020】
〔第一層〕
第一層1は、透明な熱可塑性樹脂から構成する。第一層を透明とすることで、塗装感、或いは表面艶等の意匠性を付与出来る。また、熱可塑性樹脂とすることにより成形性(真空成形性)が得られる。なお、第一層の透明とは、通常は無着色透明とするが、必要に応じ適宜、着色剤を添加して、着色透明としても良い。また、半透明としても良い。なお、着色剤としては、後述絵柄層で列記する如き公知のものが使用できる。
【0021】
透明な熱可塑性樹脂としては、基本的には透明性を有する熱可塑性樹脂であれば特に制限は無い。また、この第一層とする樹脂シートに絵柄層を印刷する場合は、更に印刷適性を有するものを用いれば良い。この様な熱可塑性樹脂は、例えば、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、メチル(メタ)アクリレート−スチレン共重合体等〔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。以下同様。〕のアクリル樹脂、ポリエチレン、ポリプロピレン、ポリメチルペンテン、ポリブテン、アイオノマー、エチレン−プロピレン共重合体、エチレン−プロピレン−ブテン共重合体、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系樹脂、ポリブチレンテレフタレート、ポリエステル系熱可塑性エラストマー、完全非晶質ポリエステル等のポリエステル樹脂、ポリカーボネート樹脂、ポリスチレン樹脂、塩化ビニル樹脂等である。
【0022】
なかでも、アクリル樹脂は透明な熱可塑性樹脂として好ましい樹脂の一つである。それは、アクリル樹脂が備えた優れた透明性によって、塗装感、或いは表面艶等の高級感溢れる意匠性を付与出来るからである。また、アクリル樹脂では、ポリオレフィン系樹脂等を使用する場合に比べて、耐候性及び耐擦傷性等の表面物性も良好にできる利点もある。
【0023】
第一層は、樹脂シート(表面シート)として用意し、通常は、この樹脂シートの裏側面に絵柄層を印刷した後、接着剤を使用して、第二層、第三層と積層して所望の加飾成形用シートとする。なお、第一層とする樹脂シート(フィルム)の厚さは、コスト、成形性、印刷適性、意匠性(塗装感)等の観点から適宜厚さとすれば良いが、通常は30〜200μm程度が良い。なかでも100μm前後が一般的である。
【0024】
また、第一層中には、加飾成形用シートの表側面となる関係上、必要に応じて、適宜、ポリエチレンワックス、パラフィンワックス等の滑剤、シリカ、球状α−アルミナ、鱗片状α−アルミナ等の粒子からなる減摩剤、炭酸カルシウム、硫酸バリウム、酸化アルミニウム等の粒子からなる充填剤、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やヒンダードアミン系ラジカル捕捉剤等の光安定剤等の各種添加剤を、物性調整の為に添加しても良い。但し、第一層が不透明とならない範囲内で添加する。
【0025】
〔第二層〕
第二層2は、ポリオレフィン系樹脂から構成する。第二層に吸湿性の少ないポリオレフィン系樹脂を使用することで、従来この第二層に吸湿性を有するABS樹脂を使用した為に生じたシート成形時の膨れ発生を防げる。
ポリオレフィン系樹脂としては、用途に応じた樹脂を適宜選択すれば良い。例えば、ポリオレフィン系樹脂としては、ポリエチレン、ポリプロピレン、ポリメチルペンテン、ポリブテン、アイオノマー、エチレン−プロピレン共重合体、エチレン−プロピレン−ブテン共重合体、オレフィン系熱可塑性エラストマー等を使用する。
【0026】
また、第二層は、加飾成形用シートとして必要な機械的強度や成形適性等に総厚を、通常は主体的に担う層となる。従って、第二層の厚みは通常0.1〜0.5mm程度とする。
【0027】
また、この様に総厚を主体的(通常総厚の5割以上とするが5割未満の場合もあり得る)に担う事が多い第二層中には、充填剤を添加することで、加飾成形用シートとしての成形性を調整することができる。充填剤添加は、シート成形時の適正温度範囲を広げ安定的なシート成形を容易にする。
充填剤としては、公知の充填剤(フィラー)を適宜使用すれば良い。該充填剤としては、例えば、酸化アルミニウム、炭酸カルシウム、硫酸カルシウム、硫酸バリウム、タルク、シリカ、ケイ酸リチウムアルミニウム、シリコーンカーバイト等が使用できる。
【0028】
なお、充填剤を添加すると、シート成形後に加飾成形用シートの(第一層の)表面にまでそれが影響して、表面の鏡面性を低下させることがある。この様な場合には、第二層を多層構成として、その第一層側は充填剤を添加しない層とすると鏡面性低下を防げる。具体的には例えば、図1(B)で例示した加飾成形用シートSの如く、第二層2を2層構成として、表層2Aは充填剤無添加として、裏層2Bに充填剤を添加した構成とする。
【0029】
また、第二層中には、加飾成形用シートに、その被着体に対する隠蔽性付与、着色による装飾、絵柄層の背景色演出等の為に、着色剤等を添加しても良い。着色剤としては、後述絵柄層で列記する如き公知の着色剤が使用できる。例えば、隠蔽性の点では、チタン白、亜鉛華、三酸化二アンチモン等の白色顔料の他、絵柄層の発色に支障の無い範囲でカーボンブラック、鉄黒等の黒色顔料を用いる。
【0030】
〔第三層〕
第三層3は、ABS樹脂とポリオレフィン系樹脂との混合樹脂から構成する。また、第三層は第二層との間に接着剤層を介さず、第二層と接する様に積層する。これによって、ポリオレフィン系樹脂の第二層との層間密着性と共に、ABS樹脂の被着体(樹脂成形物)に対する加飾成形用シートの密着性も確保できる。なお、ポリオレフィン系樹脂としては、前述第2層で列記した如き樹脂を適宜使用する。また、ABS樹脂とポリオレフィン系樹脂とは単純に混ぜただげでは、層状に剥離が起きたりするので、相溶化剤を添加するのが好ましい。相溶化剤としてはABS樹脂とポリオレフィン系樹脂との相溶性を改善できるものであれば特に制限は無く、例えば、エポキシ化SBS(スチレン−ブタジエン−スチレンブロック共重合体のブタジエン部分の不飽和二重結合の一部をエポキシ化した化合物)、無水マレイン酸等を用いることができる。ABS樹脂とポリオレフィン系樹脂と、更に相溶化剤との配合は、樹脂の組み合わせ及び割合によって大きく異なるが、ポリオレフィン系樹脂がポリプロピレン樹脂の場合では、質量比で、ABS樹脂/ポリオレフィン系樹脂/相溶化剤を、100/30〜80/5〜20程度の配合比率範囲で良好な結果が得られた。
【0031】
第三層を第二層と接する様に積層するには、第一層とする樹脂シートに第二層をラミネートした後の第二層の裏面側に、或いは第二層とする樹脂シートの裏面側に、押出法で成膜と同時に積層しても良いが、前述第二層と共に2層共押出法でこれら二層を成膜と同時に積層する方が、第三層とポリオレフィン系樹脂の第二層との層間の密着性を良好にできる。また、追加的ラミネート工程も不要となる点で好ましい。
【0032】
なお、第三層には、第二層同様に、必要に応じ適宜、充填剤、着色剤等の各種添加剤を添加しても良い。
また、加飾成形用シートは、この第三層で直接に被着体である樹脂成形物に接着積層させる他、密着強化が必要な場合には、塩化ビニル−酢酸ビニル共重合体等の熱可塑性樹脂、或いはウレタン樹脂、エポキシ樹脂等の硬化性樹脂等による公知の接着剤を適宜塗工する等して、裏面接着剤層を設けても良い。
【0033】
〔絵柄層〕
絵柄層4は絵柄を表現する為の層であり、絵柄層が無くても相応の意匠性(着色樹脂シート自体による無地柄等)は付与できるが、より意匠性を向上させる為に通常は設ける。絵柄層は、通常、第一層とする樹脂シートの裏面側に印刷法によって形成する。印刷は、グラビア印刷、活版印刷、シルクスクリーン印刷、オフセット印刷、インクジェット印刷等の公知の方法で良い。また、全面ベタ柄の場合は、ロールコート等の公知の塗工法でも良い。なお、使用するインキ(或いは塗液)も、第一層の樹脂に応じたものを適宜選択すれば良い。
【0034】
例えば、第一層の樹脂がアクリル樹脂であれば、バインダーの樹脂がアクリル樹脂系のインキ(或いは塗液)は望ましいインキの一つである。なお、バインダーの樹脂としては、この他、塩素化ポリエチレン、塩素化ポリプロピレン等の塩素化ポリオレフィン樹脂、ポリエステル樹脂、ウレタン樹脂、酢酸ビニル樹脂、塩化ビニル−酢酸ビニル共重合体、セルロース系樹脂等の熱可塑性樹脂、或いは、ウレタン樹脂、エポキシ樹脂等の熱硬化性樹脂等が、これら樹脂の単体又は混合物として使用される。また、インキの着色剤としては特に限定は無く、例えば、チタン白、カーボンブラック、弁柄、コバルトブルー、黄鉛等の無機顔料、フタロシアニンブルー、イソインドリノン、キナクリドン等の有機顔料、アルミニウム粉末等の金属顔料、二酸化チタン被覆雲母粉末等の真珠光沢(パール)顔料、或いは染料等の公知の着色剤を用いることができる。
なお、絵柄層の絵柄は、用途に応じて、例えば、木目模様、石目模様、砂目模様、タイル貼調模様、煉瓦積調模様、布目模様、皮絞模様、文字、記号、図形、幾何学模様、全面ベタ等が単独又は組み合わせで使われる。
【0035】
なお、上記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、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、或いは、メチル(メタ)アクリレート、エチル(メタ)アクリレート、ブチル(メタ)アクリレート、オクチル(メタ)アクリレート、シクロヘキシル(メタ)アクリレート等と、2−ヒドロキシエチル(メタ)アクリレート、2−ヒドロキシ−3−フェノキシプロピル(メタ)アクリレート等の分子中にヒドロキシル基を有する(メタ)アクリル酸エステルとを共重合させて得られるアクリルポリオール等のアクリル樹脂を、単体又は2種以上混合して使用する。アクリルポリオールを用いた場合には、必要に応じて、2,4−トリレンジイソシアネート、1,6−ヘキサメチレンジイソシアネート等のイソシアネートを添加して架橋しても良い。なお、(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である。
【0036】
また、アクリル樹脂は、塩化ビニル−酢酸ビニル共重合体との混合樹脂として使用するのも密着性の点で好ましい。塩化ビニル−酢酸ビニル共重合体としては、通常、酢酸ビニル含有量が5〜20質量%程度、平均重合度350〜900程度のものが用いられる。また、塩化ビニル−酢酸ビニル共重合体は、必要に応じ、更にマレイン酸、フマル酸、(メタ)アクリル酸等のカルボン酸を共重合させたものでも良い。
また、アクリル樹脂と塩化ビニル−酢酸ビニル共重合体との混合割合は、アクリル樹脂/塩化ビニル−酢酸ビニル共重合体=1/9〜9/1(質量比)程度で使用する。
【0037】
なお、絵柄層としては、木目柄等の絵柄による装飾目的の層の他に、導電体層、磁性体層等の機能性層でも良い。例えば、導電体層では、上記特定樹脂のバインダー中に含有させる材料として、着色剤の代わりに銀粉等の導電性粉末を分散させる。また、磁性体層の場合には、着色剤の代わりに、酸化鉄(γ−Fe23)等から成る磁性体粉末を分散させる。
すなわち、本発明に於ける加飾とは、絵柄層によって、機能性層、或いは目視不可能な模様等を付与することも包含する。なお、目視不可能な模様の例としては、可視光に対しては透明で紫外線照射で蛍光を発する蛍光インキで印刷した絵柄、赤外線吸収性インキで印刷したバーコード等である。
【0038】
〔接着剤層〕
接着剤層5は、該層が接する第一層や第二層、或いは絵柄層への密着性を考慮して、これらの層に用いられる樹脂等に応じて、公知の接着剤のなかから適宜選択使用すれば良い。例えば、第一層の樹脂が熱可塑性樹脂がアクリル樹脂であり、第二層のポリオレフィン系樹脂がポリプロピレン樹脂である場合には、ポリエステル系ウレタン樹脂等の硬化性ウレタン樹脂が好ましい結果を与える。この他、接着剤層の樹脂としては、例えば、酢酸ビニル樹脂、塩化ビニル−酢酸ビニル共重合体、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、熱可塑ウレタン樹脂等の熱可塑性樹脂、或いは、フェノール樹脂、エポキシ樹脂等の硬化性樹脂、或いは、ゴム系樹脂等が、単独又は2種以上の混合物として用いられる。
【0039】
なお、硬化性ウレタン樹脂としては、2液硬化型ウレタン樹脂、1液硬化型(湿気硬化型)ウレタン樹脂等を使用すれば良い。2液硬化型ウレタン樹脂の場合は、ポリオールを主剤とし、多価イソシアネートを架橋剤とする。ポリオールとしては、アクリルポリオール、ポリエステルポリオール、ポリカーボネートポリオール、ポリエーテルポリオール、ポリウレタンポリオール等が、また、多価イソシアネートとしては、2,4−トリレンジイソシアネート、キシレンジイソシアネート、ジフェニルメタン−4,4′−ジイソシアネート等の芳香族イソシアネート、1,6−ヘキサメチレンジイソシアネート、イソホロンジイソシアネート、水素添加トリレンジイソシアネート等の脂肪族(乃至は脂環式)イソシアネートが用いられる。或いは、イソシアネートとしては、これらイソシアネートの多量体、又は付加体を用いても良い。
【0040】
また、1液硬化型(湿気硬化型)ウレタン樹脂は、分子末端にイソシアネート基を有するプレポリマーを必須成分とする組成物である。該プレポリマーは、上記ポリオールやイソシアネートの反応によって、通常は分子両末端に各々イソシアネート基を1個以上設けたポリイソシアネートプレポリマーである。そのイソシアネート基同士が、空気中の水分により反応して鎖延長反応を起こして、その結果、分子鎖中に尿素結合を有する反応物を生じて、この尿素結合に更に分子末端のイソシアネート基が反応して、ビウレット結合を起こして分岐し、架橋反応を起こす。
【0041】
接着剤層は、上記の如き樹脂を含むインキ(或いは塗液)を用いて、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ことができる。接着剤層の厚みは特に制限はないが、例えば5〜20μm程度である。
なお、接着剤層は、第二層(或いは第三層との積層体として等)を、絵柄層が形成された第一層の該絵柄層側の面に、押出法で成膜と同時に積層する場合には、第二層の熱融着で接着させることにより省略することもできる。しかし、絵柄層を形成した第一層の樹脂シートと、第二層及び第三層を2層共押出法で積層した積層体(積層シート)とを、それぞれ別々に用意しておき、これらをドライラミネーション法で積層する場合には、この接着剤層により接着積層する。この場合、接着剤層は、第一層(絵柄層)側、或いは第二層側、或いは両方である。
また、接着剤層で接着する面は、必要に応じ適宜、密着性を強化するために、コロナ放電処理、プラズマ処理、プライマー塗工等の易接着処理を施しておいても良い。
【0042】
被着体への加飾成形用シートの積層法
本発明の加飾成形用シートを被着体へ積層する場合のその積層方法としては、該シートが加熱軟化され成形される積層方法が、本発明の効果が発揮され享受できる点で好適である。また、被着体は、該シートの密着性の点で好適にはABS樹脂からなる樹脂成形物である。加飾成形用シートを被着体へ積層する事によって、被着体と加飾成形用シートとの積層体として加飾成形品が得られる。加飾成形用シートを成形して積層する具体的方法としては、例えば、(1)射出成形同時加飾方法、(2)真空成形積層方法等が挙げられる。以下、これらについて更に説明しておく。
【0043】
(1)射出成形同時加飾方法:特公昭50−19132号公報、特公昭43−27488号公報等に記載されるように、加飾成形用シートを射出成形の雌雄両型間に配置した後、流動状態の樹脂を型内に射出充填し、樹脂成型物の成形と同時にその表面に加飾成形用シートを積層する方法である。加飾成形用シートの成形は、射出成形型自体或いは外部の成形型で成形する。
(2)真空成形積層方法:特公昭56−45768号公報(オーバーレイ法)、特公昭60−58014号公報(真空プレス法)等に記載されるように、成形品等の立体形状の被着体の表面に加飾成形用シートを間に接着剤を介して対向又は載置し、被着体側からの少なくとも真空吸引による圧力差により加飾成形用シートを成形して被着体に積層する方法である。
【0044】
次に、上記の中でも、特に射出成形同時加飾方法について更に詳述する。
【0045】
先ず、射出成形同時積層方法では、加飾成形用シートの予熱無しの場合でも、射出樹脂による熱圧を加飾成形用シートが受ける。従って、射出成形同時加飾方法は、加飾成形用シートの予備成形は行う形態でも行わない形態でも、いずれでも好適である。また、加飾成形用シートの予熱を行っても良く、行わなくても良い。なお、予備成形時には通常は加飾成形用シートは予熱する。
【0046】
なお、もちろんの事だが、加飾成形用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、加飾成形用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加飾成形用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加飾成形用シートを成形しても良い。また、樹脂圧と樹脂熱で加飾成形用シートを成形する場合でも、加飾成形用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、加飾成形用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、型間に加飾成形用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加飾成形用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加飾成形用シートを積層できる点で好ましい。しかし、予備成形済みの加飾成形用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。
【0047】
図3の概念図によって、射出成形同時加飾方法を、その或る一形態で説明する。同図に示す形態では、射出成形型とは別の型である真空成形型で、加飾成形用シートを加熱し軟化させて予備成形した後に、成形された加飾成形用シートを射出成形型に挿入後、型締めして樹脂を射出する、オフライン予備成形による形態である。次に、この図3を用いて、この形態での射出成形同時加飾方法を更に説明する。
また、この形態は、上記した加飾成形用シートの予備成形、予熱の各種組合わせ形態の中で、加飾成形用シートの絞りが深い場合に、より好ましい形態である。
【0048】
先ず、図3(A)の如く、型面に吸引孔31等の吸引手段を有する真空成形型Mvを用いて、ヒータ32で加熱軟化させた加飾成形用シートを真空成形により予備成形する。なお、真空成形型Mvは、鉄やアルミニウム等の金属、或いはセラミックス等からなる。また、加飾成形用シートSは適宜枠状のシートクランプ33で固定する。この際、加飾成形用シートの第三層側は、射出樹脂側(図面上方)となる向きとする。また、ヒータ32による加熱軟化は、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、予備成形は、吸引孔から吸引して真空成形して、加飾成形用シートを真空成形型Mvの型面に沿わせ真空成形する。なお、真空成形は圧空も併用する真空圧空成形でも良く、これも包含する。
【0049】
次いで、予備成形された加飾成形用シートSを、図3(B)の如く、一対の射出成形型MaとMbとの間に供給する。ここでは射出成形型Maの方は射出ノズルと連通する湯道(ランナー)及び湯口(ゲート)を有し、射出成形型Mbはそのキャビティ面が前記予備成形型Mvの型面と同一又は略同一形状を成し、予備成形済の加飾成形用シートを固定する型となる。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間に加飾成形用シートSを供給し、型Mbに加飾成形用シートSを枠状のシートクランプ34で押圧する等して固定する。この際、加飾成形用シートの第三層側は、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、図3(C)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す。また、加飾成形用シートの不要部分がある場合は、それを適宜トリミングすれば、図2の断面図で示した如き、樹脂成形物6の表面に加飾成形用シートSが積層した構成の加飾成形品Pが得られるという、加飾方法である。
【0050】
なお、上記工程において、予備成形時(或いは更に樹脂射出時も)に加飾成形用シートに熱及び圧が加わり、このとき、加飾成形用シートが吸湿しているとその水分が気化して、膨れが発生し不具合となる。特に、予備成形工程では、加飾成形用シートを成形し得る程度のまで加熱軟化させる必要が膨れが発生し易い。
【0051】
加飾成形品
次に、本発明による加飾成形品は、図2の断面図でその一形態を例示する加飾成形品Pの如く、前述した如き構成の加飾成形用シートSが、ABS樹脂からなる樹脂成形物6の表面に積層された如き層構成の成形品である。なお、同図では、加飾成形用シートSのシート内層構成の図示は省略してあるが、この部分は例えば図1の断面図で例示の如き構成であり、その第一層1に対して第三層3側を樹脂成形物6側を向く様にして加飾成形用シートSが樹脂成形物6上に積層された構成である。
なお、樹脂成形物6上への加飾成形用シートSの積層は、真空成形積層方法等によっても良いが、樹脂成形物の成形と同時に行えて生産性が優れる点等で、射出成形同時加飾方法によって行うのが好ましい。
【0052】
なお、樹脂成形物を構成するABS樹脂中には、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、前述絵柄層で述べた如き公知の着色剤を使用すれば良い。また、樹脂中には、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、エラストマー等の公知の各種添加剤を含有させる。
また、樹脂成形物の樹脂はABS樹脂が主体であるが、副成分の範囲内でその他の樹脂が混合されていても良い。
【0053】
なお、加飾成形品の形状は、通常、加飾成形用シートの積層面が凹凸面等と非平面の立体物である。しかし、本発明の加飾成形品としては、加飾成形用シートの積層面は平面だが他の面が非平面の立体物、積層面が平面となる板状物を排除するものではない。平面への積層の過程で、加飾成形用シートが成形され伸ばされる場合もある。また、加飾成形品の全体形状は、板状(平板、曲面板)、柱状、三次元立体物等と任意である。
【0054】
加飾成形用シート及び加飾成形品の用途
なお、上述した加飾成形用シートで表面加飾した加飾成形品等の加飾物品の用途は、任意であるが、例えば、自動車等の車両の内装材又は外装材、幅木、回縁等の造作部材、窓枠、扉枠等の建具、壁、床、天井等の建築物の内装材、テレビ受像機、空調機等の家電製品の筐体、容器等である。
【0055】
【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。
【0056】
〔実施例1〕
図1(B)の断面図で示す如き構成の加飾成形用シートSを次の様にして作製した。
先ず、第一層1とする無着色で透明な樹脂シートとして、ポリメチルメタクリレート(PMMA)を主成分とする厚さ125μmの樹脂シートを用意した。そして、この樹脂シートの裏側とする面に、バインダーの樹脂にブチルメタクリレートを含むアクリル樹脂と塩化ビニル−酢酸ビニル共重合体との混合樹脂を用い、着色剤にキナクリドンレッド、イソインドリノン、フタロシアニンブルー、及びカーボンブラックを用いた着色インキで、木目の絵柄を表現した絵柄層4をグラビア印刷法で形成して印刷シートを得た。
【0057】
一方、第二層2と第三層3とを2層共押出法で成膜と同時に積層した積層シートを別途用意した。この際、第二層2の方は、図1(B)の如く、表層2A及び裏層2Bとの2層構成で形成した。なお、上記2層共押出法は、第二層と第三層との2層を共に押出すと言う意味において2共押出しであるが、第二層中の層構成も含めて言えば厳密には3層共押出法ということになる。そして、第二層2の表層2Aには、ポリプロピレン60質量部にエラストマー40質量部を配合してなるポリプロピレン系のオレフィン系熱可塑性エラストマー(着色顔料及び充填剤は無添加)を用いた。第二層2の裏層2Bには、ポリプロピレン樹脂40質量部にエラストマー30質量部を配合してなるポリプロピレン系のオレフィン系熱可塑性エラストマー70質量部に、更に着色顔料10質量部、充填剤としてタルク20質量部を添加した着色隠蔽性の樹脂を用いた。また、第三層3には、ABS樹脂100質量部、ポリプロピレン樹脂50質量部、及び相溶化剤としてエポキシ化SBS10質量部が配合された樹脂(着色顔料及び充填剤は無添加)を用いた。なお、これら3層の厚みは、表層2A/裏層2B/第三層3=30μm/290μm/30μmで、積層シートとしての厚みは350μmである。
【0058】
そして、前記印刷シートの絵柄層側の面に、ポリエステル系の硬化性ウレタン樹脂からなる接着剤を固形分で10g/m2塗布して、ドライラミネーション法によって、上記積層シートの第二層2側の面と貼り合わせた。この後、40℃3日間養生して、所望の加飾成形用シートSを得た。
【0059】
〔比較例1〕
実施例1において、印刷シートと貼り合わせる積層シートの代わりに、厚さ350μmで着色顔料及び充填剤で着色隠蔽性とした単なるABS樹脂シートを用いた他は、実施例1と同様にして加飾成形用シートを作製した。
【0060】
〔性能評価〕
実施例及び比較例で得られた加飾成形用シートについて、吸湿促進試験として、40℃90%RHの環境下に1日放置した後、該シートを予備成形で加熱軟化し成形する形態での射出成形同時加飾方法によって加飾成形品を作製して、そのときの膨れ発生の有無で評価した。
【0061】
すなわち、射出成形同時加飾は、上記加飾成形用シートを、図3の概念的な説明図で示した如きオフライン予備成形の態様を採用した射出成形同時加飾方法によって、射出樹脂としてABS樹脂を使用して、樹脂成形物の表面にその成形と同時に積層一体化して、図2の断面図の如き、加飾成形用シートSが樹脂成形物6に積層された加飾成形品Pを得た。
【0062】
射出成形同時加飾は、具体的には、先ず、図3(A)の如く、射出成形の雌型Mbと同じキャビティ面を有するが、該雌型Mbとは別体の真空成形型Mv上に、赤外線輻射式熱盤からなるヒータ32にて、非接触状態で加飾成形用シートSを表面温度170℃にまで加熱し軟化させた状態とした後、真空成形型Mvに穿設した吸引孔31から真空吸引して、真空成形型Mvのキャビティ面上に予備成形し、冷却させて、予備成形済みの加飾成形用シートを脱型した。そして、図3(B)の様に、この予備成形済みの加飾成形用シートSを、その第三層側が射出成形用の雄型Ma側を向く様にして、シートクランプ34で射出成形用の雌型Mbに装着した後、図3(C)の様に、雌雄両型を型締めし、雌雄両型で形成されるキャビティ内に加熱熔融したABS樹脂を射出充填し冷却固化させると共に、該加飾成形用シートと一体化させた加飾成形品とした後、雌雄両型を型開きし、該加飾成形品を取り出した。
【0063】
以上の結果、実施例1の加飾成形用シートを用いた場合では、膨れが発生せず、加飾成形品の表面、つまり成形後の加飾成形シートの表面は、鏡面性が良好であった。これに対して、比較例1の加飾成形用シートを用いた場合では、第一層と第二層間での発泡による膨れが全面に発生してしまった。その結果、上記表面の鏡面性は十分とは言えなかった。
また、実施例1の加飾成形用シートは、その第三層を2層構成としてその第二層側を充填剤更には着色顔料も無添加の層としてある為に、この点でも成形後の加飾成形用シートの表面はユズ肌にならずに鏡面性は良好であった。
【0064】
【発明の効果】
(1)本発明の加飾成形用シートによれば、ABS樹脂の吸湿性に起因するシート成形時の膨れを、ABS樹脂の樹脂成形物に対する密着性を確保しつつ、解消できる。また、塗装感も得られる。
(2)更に、第二層と第三層とが2層共押出法で積層された構成とすれば、既に成膜済みの第二層に押出法等で第三層をラミネートする追加的な工程が不要で、容易且つ低コストで製造できる加飾成形用シートとなる。また、第三層と第二層との層間密着性もより確実に得やすい。
(3)また、第一層の裏面に絵柄層及び接着剤層を積層しておけば、絵柄層によって高意匠にでき、接着剤層によって絵柄層形成済みの第一層と第二層とを、或いは第二層及び第三層とを、密着性良く積層できる。
(4)本発明の加飾成形品によれば、ABS樹脂成形物と加飾成形用シートの密着性が良く、加飾成形用シート部分でのシート成形時の膨れ発生も無い等の、上記加飾成形用シートで得られるそれぞれの効果を享受できる。
【図面の簡単な説明】
【図1】本発明による加飾成形用シートの形態例を例示する断面図。
【図2】本発明による加飾成形品の一形態を例示する断面図。
【図3】本発明の加飾成形用シートの一適用例として、射出成形同時加飾方法をその一形態で説明する概念図。
【符号の説明】
1 第一層
2 第二層
2A 表層
2B 裏層
2C 中心層
3 第三層
4 絵柄層
5 接着剤層
6 樹脂成形物
31 吸引孔
32 ヒータ
33 シートクランプ
34 シートクランプ
Ma 射出成形型(雄型)
Mb 射出成形型(雌型)
Mv 真空成形型
P 加飾成形品
S 加飾成形用シート
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a decorative molding sheet used for surface decoration of various articles and a decorative molded product using the same.
[0002]
[Prior art]
Conventionally, a decorative molded product in which the surface of a resin molded product is decorated has been used for various purposes. For example, in the injection molding simultaneous decorating method disclosed in Japanese Patent Publication No. 50-19132, Japanese Patent Publication No. 43-27488, etc., after a decorative molding sheet is disposed between both male and female molds, the molten resin A method of obtaining a decorative molded product in which a decorative molding sheet is bonded and laminated on the surface thereof simultaneously with molding of a resin molded product by injection filling into a cavity and solidifying is disclosed.
[0003]
Further, as a resin material used for a resin molded product, there are generally many acrylonitrile-butadiene-styrene copolymer resins (hereinafter also referred to as ABS resins), acrylic resins, polycarbonate resins, and the like. For this reason, for the decorative molding sheet, an ABS resin sheet should be used for the base material sheet (back sheet) on the back side, which is the resin molding side, in consideration of adhesion to these resins and moldability. There are many.
On the other hand, when a feeling of painting is required as a design of a decorative molded product, a transparent resin sheet using an acrylic resin having excellent transparency and excellent moldability, weather resistance, scratch resistance, etc. It is often used for the base material sheet (surface sheet) on the side. Further, in order to enable high-design expression, usually, a pattern layer is printed between the top sheet (first layer) and the back sheet (second layer), and the top sheet and back sheet Has been laminated with an adhesive.
[0004]
For example, in Japanese Patent Laid-Open No. 2001-232660, a transparent surface sheet (first layer) made of an acrylic resin and a binder resin are made of a mixture of an acrylic resin and a vinyl chloride-vinyl acetate copolymer in order from the surface side. Decorative molding with a structure in which an image layer, an adhesive layer made of a mixture of an acrylic resin and a vinyl chloride-vinyl acetate copolymer, and a colored concealing back sheet (second layer) made of an ABS resin are laminated. A sheet is disclosed.
[0005]
[Problems to be solved by the invention]
However, as described above, in the decorative molding sheet in which the first layer made of the top sheet of the acrylic resin and the second layer made of the back sheet of the ABS resin are laminated, the ABS resin is likely to absorb moisture over time. When the decorative molding sheet is heated at the time of vacuum forming, water may be vaporized to generate bubbles between the first layer and the second layer, thereby causing swelling.
The problem of swelling at the time of forming the sheet can be solved by using a polypropylene resin, which is a resin that absorbs moisture instead of the ABS resin, instead of the resin of the back layer sheet as the second layer. A new problem arises in that the adhesion between the decorative molding sheet and the resin molding made of ABS resin is lowered.
[0006]
That is, the subject of this invention is preventing the swelling at the time of sheet | seat shaping | molding when laminating and decorating a decorative molding sheet | seat on an ABS resin molding, and provides the decoration forming sheet | seat which implement | achieves it It is to be. Another object of the present invention is to provide such a decorative molded product in which such decorative molding sheets are laminated with good adhesion.
[0007]
[Means for Solving the Problems]
  Therefore, in order to solve the above problems, in the decorative molding sheet of the present invention, in order from the front side, a first layer made of a transparent thermoplastic resin, a second layer made of a polyolefin resin, and acrylonitrile-butadiene-styrene. Copolymer resin and polyolefin resinAs a compatibilizer, epoxidized SBS (a compound obtained by epoxidizing a part of the unsaturated double bond of the butadiene portion of the styrene-butadiene-styrene block copolymer) andThe third layer made of the mixed resin was laminated, and the second layer and the third layer were laminated in contact with each other.
[0008]
  In such a configuration, since the polyolefin resin is used for the second layer, it is possible to eliminate the swelling at the time of forming the sheet due to the hygroscopic property of the ABS resin. In addition, on the back side of the second layer, acrylonitrile-butadiene-styrene copolymer resin (ABS resin) and polyolefin resin are used.With compatibilizerSince the third layer used as the mixed resin is provided, the adhesion to the resin molded product made of the ABS resin can be secured while avoiding the above-mentioned problem of swelling when the ABS resin is used. Therefore, it is possible to achieve both adhesion of the decorative molding sheet to the ABS resin and elimination of swelling. In addition, since the third layer is configured to be in contact with the second layer as a mixed resin layer with the polyolefin resin, it is possible to ensure adhesion between the second layer of the polyolefin resin. And since the 1st layer of the surface side is transparent, a coating feeling is also obtained.
In the decorative molding sheet of the present invention, the polyolefin resin is a polypropylene resin, and the ratio of acrylonitrile-butadiene-styrene copolymer resin / polyolefin resin / compatibilizer is 100/30 to 80 in mass ratio. It can be set as / 5-20.
[0009]
Moreover, the decorative molding sheet of the present invention has a configuration in which the second layer and the third layer are further laminated by a two-layer coextrusion method in the decorative molding sheet having the above configuration.
[0010]
  By adopting such a configuration, the third layer can be formed simultaneously with the formation of the second layer, so an additional step of laminating the third layer to the already formed second layer by an extrusion method or the like is unnecessary. Thus, the decorative molding sheet can be manufactured easily and at low cost. In addition, the interlayer adhesion between the third layer and the second layer can be more easily obtained.
Moreover, the sheet | seat for decorative shaping | molding of this invention can make a 2nd layer into 2 layer structure of a surface layer and a back layer.
In addition, the decorative molding sheet of the present invention can be configured such that the surface layer of the second layer, the back layer of the second layer, and the third layer are laminated by a three-layer coextrusion method.
[0011]
Further, the decorative molding sheet of the present invention is a decorative molding sheet having any one of the above-described configurations, and a configuration in which a pattern layer and an adhesive layer are laminated in this order on the back surface of the first layer. did.
[0012]
By adopting such a configuration, the design layer can be made into a high design, and the adhesive layer can be used to adhere the first layer on which the pattern layer has been formed to the second layer or the second layer and the third layer. Can be laminated with good performance.
[0013]
Moreover, the decorative molded product of the present invention has a decorative molding sheet having any one of the above-described structures on the surface of a resin molded product made of acrylonitrile-butadiene-styrene copolymer resin, and the third layer side of the resin molded product. It was set as the structure laminated | stacked toward the molded object side.
[0014]
In this way, the decorative molding sheet having the specific configuration as described above is laminated on the resin molding of acrylonitrile-butadiene-styrene copolymer resin (ABS resin) to obtain an ABS resin molding and Each of the effects obtained with the above decorative molding sheet can be enjoyed such that the adhesion of the decorative molding sheet is good and there is no swelling during the molding of the sheet at the decorative molding sheet.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0016]
Overview:
First, some of the structural examples of the decorative molding sheet of the present invention are illustrated in the cross-sectional view of FIG. The decorative molding sheet S shown in FIG. 1A is, in order from the front side, a first layer 1 made of a transparent thermoplastic resin, a pattern layer 4, an adhesive layer 5, a second layer 2 made of a polyolefin resin, Further, a third layer 3 made of a mixed resin of acrylonitrile-butadiene-styrene copolymer resin and polyolefin resin is laminated so as to be in contact with the second layer 2. The second layer 2 and the third layer 3 are preferably laminated by a two-layer coextrusion method from the viewpoint of avoiding an increase in the number of steps and interlayer adhesion. The picture layer 4 and the adhesive layer 5 may be omitted, but are preferably provided in terms of design properties, interlayer adhesion, and the like. Usually, these are provided.
[0017]
Next, the decorative molding sheet S shown in FIG. 1 (B) is an example in which the second layer 2 has a two-layer structure of a surface layer 2A and a back layer 2B in addition to the structure of FIG. 1 (A). It is. As a specific example of the two-layer structure, for example, a filler such as talc is usually added to the second layer 2 for adjustment of moldability, but the filler is not added to the surface layer 2A, but the back layer. It is the structure added to 2B.
[0018]
Next, the structure of the decorative molded product of the present invention is illustrated in the cross-sectional view of FIG. The decorative molded product P shown in FIG. 2 has a decorative molding sheet S having a configuration as illustrated in the cross-sectional view of FIG. 1 on the surface of a resin molded product 6 made of ABS resin, and the third layer 3 side is resin molded. It is a decorative molded product having such a structure that it is laminated in the direction of the object side. In the drawing, illustration of the layer structure of the decorative molding sheet S is omitted, but the portion is the same as the decorative molding sheet S illustrated in the cross-sectional view of FIG.
[0019]
Decorative molding sheet:
First, the decorative molding sheet will be described in order from the first layer on the surface side.
[0020]
[First layer]
The first layer 1 is made of a transparent thermoplastic resin. By making the first layer transparent, it is possible to impart a design feeling such as a feeling of painting or surface gloss. Moreover, moldability (vacuum moldability) is obtained by using a thermoplastic resin. The transparency of the first layer is usually non-colored and transparent, but may be colored and transparent by adding a colorant as necessary. Further, it may be translucent. In addition, as a coloring agent, the well-known thing as listed by the pattern layer mentioned later can be used.
[0021]
The transparent thermoplastic resin is basically not particularly limited as long as it is a thermoplastic resin having transparency. Moreover, what is necessary is just to use what has printability, when printing a pattern layer on the resin sheet used as this 1st layer. Such thermoplastic resins include, for example, polymethyl (meth) acrylate, polybutyl (meth) acrylate, methyl (meth) acrylate-butyl (meth) acrylate copolymer, methyl (meth) acrylate-styrene copolymer, etc. , (Meth) acrylate means acrylate or methacrylate. The same applies below. Acrylic resin, polyethylene, polypropylene, polymethylpentene, polybutene, ionomer, ethylene-propylene copolymer, ethylene-propylene-butene copolymer, polyolefin resin such as olefin thermoplastic elastomer, polybutylene terephthalate, polyester Examples thereof include thermoplastic elastomers, polyester resins such as completely amorphous polyester, polycarbonate resins, polystyrene resins, vinyl chloride resins, and the like.
[0022]
Especially, an acrylic resin is one of the preferable resin as a transparent thermoplastic resin. This is because the excellent transparency provided by the acrylic resin can impart a high-quality design such as a feeling of painting or surface gloss. In addition, the acrylic resin has an advantage that the surface properties such as weather resistance and scratch resistance can be improved as compared with the case of using the polyolefin-based resin or the like.
[0023]
The first layer is prepared as a resin sheet (surface sheet). Usually, after the pattern layer is printed on the back side of the resin sheet, it is laminated with the second and third layers using an adhesive. A desired decorative molding sheet is obtained. In addition, the thickness of the resin sheet (film) as the first layer may be appropriately selected from the viewpoints of cost, moldability, printability, designability (coating feeling), etc., but usually about 30 to 200 μm. good. In particular, a thickness of around 100 μm is common.
[0024]
In addition, in the first layer, a lubricant such as polyethylene wax and paraffin wax, silica, spherical α-alumina, scaly α-alumina, as necessary, on the relation to be the front side surface of the decorative molding sheet Lubricants made of particles such as particles, fillers made of particles of calcium carbonate, barium sulfate, aluminum oxide, etc., UV absorbers such as benzotriazole, benzophenone, and fine particle cerium oxides, and light such as hindered amine radical scavengers Various additives such as a stabilizer may be added to adjust the physical properties. However, it is added within a range where the first layer does not become opaque.
[0025]
[Second layer]
The second layer 2 is made of a polyolefin resin. By using a polyolefin-based resin having a low hygroscopic property for the second layer, it is possible to prevent the occurrence of blistering at the time of sheet forming, which is caused by using an ABS resin having a hygroscopic property for the second layer.
What is necessary is just to select resin according to a use suitably as polyolefin resin. For example, as the polyolefin resin, polyethylene, polypropylene, polymethylpentene, polybutene, ionomer, ethylene-propylene copolymer, ethylene-propylene-butene copolymer, olefin thermoplastic elastomer, or the like is used.
[0026]
In addition, the second layer is usually a layer that mainly bears the total thickness in terms of mechanical strength, moldability, and the like necessary as a decorative molding sheet. Therefore, the thickness of the second layer is usually about 0.1 to 0.5 mm.
[0027]
In addition, in the second layer, which often bears the total thickness mainly (usually 50% or more of the total thickness, but may be less than 50%), by adding a filler, Formability as a decorative molding sheet can be adjusted. Addition of a filler widens an appropriate temperature range at the time of sheet forming and facilitates stable sheet forming.
As the filler, a known filler (filler) may be appropriately used. Examples of the filler that can be used include aluminum oxide, calcium carbonate, calcium sulfate, barium sulfate, talc, silica, lithium aluminum silicate, and silicone carbide.
[0028]
In addition, when a filler is added, it may affect the surface (of the first layer) of the decorative molding sheet after the sheet is formed, and the surface specularity may be lowered. In such a case, if the second layer has a multi-layer structure and the first layer side is a layer to which no filler is added, it is possible to prevent a decrease in specularity. Specifically, for example, like the decorative molding sheet S illustrated in FIG. 1 (B), the second layer 2 has a two-layer structure, the surface layer 2A has no filler added, and the filler is added to the back layer 2B. The configuration is as follows.
[0029]
Further, in the second layer, a colorant or the like may be added to the decorative molding sheet in order to impart concealability to the adherend, decoration by coloring, background color production of the pattern layer, and the like. As the colorant, known colorants listed in the picture layer to be described later can be used. For example, in terms of concealment, black pigments such as carbon black and iron black are used in addition to white pigments such as titanium white, zinc white, and antimony trioxide, as long as there is no hindrance to color development of the pattern layer.
[0030]
[Third layer]
The third layer 3 is composed of a mixed resin of ABS resin and polyolefin resin. Further, the third layer is laminated so as to be in contact with the second layer without interposing the adhesive layer between the third layer and the second layer. Thereby, the adhesion of the decorative molding sheet to the adherend (resin molding) of the ABS resin can be secured together with the interlayer adhesion with the second layer of the polyolefin resin. As the polyolefin resin, resins as listed in the second layer are appropriately used. In addition, when the ABS resin and the polyolefin resin are simply mixed, peeling occurs in a layered manner, so it is preferable to add a compatibilizing agent. The compatibilizer is not particularly limited as long as it can improve the compatibility between the ABS resin and the polyolefin resin. For example, epoxidized SBS (unsaturated double of butadiene portion of styrene-butadiene-styrene block copolymer) A compound in which a part of the bond is epoxidized), maleic anhydride, or the like can be used. The composition of the ABS resin, the polyolefin resin, and the compatibilizer varies greatly depending on the combination and ratio of the resins. However, when the polyolefin resin is a polypropylene resin, the ABS resin / polyolefin resin / compatibility is in mass ratio. Good results were obtained with a blending ratio of about 100/30 to 80/5 to 20 for the agent.
[0031]
In order to laminate the third layer in contact with the second layer, the back side of the second layer after laminating the second layer to the resin sheet as the first layer, or the back side of the resin sheet as the second layer The two layers may be laminated at the same time as the film formation by the extrusion method, but the two layers together with the second layer may be laminated at the same time as the film formation by the two-layer coextrusion method. The adhesion between the two layers can be improved. Moreover, it is preferable in that an additional laminating step is not required.
[0032]
In addition, you may add various additives, such as a filler and a coloring agent, to a 3rd layer suitably as needed similarly to a 2nd layer.
In addition, the decorative molding sheet is directly adhered and laminated to the resin molding as the adherend in this third layer, and if adhesion reinforcement is required, a heat treatment such as a vinyl chloride-vinyl acetate copolymer is performed. The back adhesive layer may be provided by appropriately applying a known adhesive such as a plastic resin or a curable resin such as a urethane resin or an epoxy resin.
[0033]
[Pattern layer]
The pattern layer 4 is a layer for expressing the pattern, and even if there is no pattern layer, a suitable design property (a plain pattern by the colored resin sheet itself) can be imparted, but it is usually provided to improve the design property. . The pattern layer is usually formed on the back side of the resin sheet as the first layer by a printing method. The printing may be a known method such as gravure printing, letterpress printing, silk screen printing, offset printing, inkjet printing or the like. In the case of a solid pattern, a known coating method such as roll coating may be used. In addition, what is necessary is just to select suitably the ink (or coating liquid) to be used according to resin of the 1st layer.
[0034]
For example, if the resin of the first layer is an acrylic resin, an ink (or coating liquid) in which the resin of the binder is an acrylic resin is one of desirable inks. Other binder resins include chlorinated polyolefin resins such as chlorinated polyethylene and chlorinated polypropylene, polyester resins, urethane resins, vinyl acetate resins, vinyl chloride-vinyl acetate copolymers, and cellulose resins. A thermoplastic resin, a thermosetting resin such as a urethane resin, an epoxy resin, or the like is used as a single substance or a mixture of these resins. The colorant of the ink is not particularly limited, and examples thereof include inorganic pigments such as titanium white, carbon black, petal, cobalt blue, and yellow lead, organic pigments such as phthalocyanine blue, isoindolinone, and quinacridone, and aluminum powder. Known colorants such as metallic pigments, pearlescent pigments such as titanium dioxide-coated mica powder, or dyes can be used.
Depending on the application, the pattern of the pattern layer may be, for example, a wood grain pattern, a stone pattern, a grain pattern, a tile pattern, a brick pattern, a fabric pattern, a leather pattern, a character, a symbol, a figure, a geometry A study pattern, a solid surface, etc. are used alone or in combination.
[0035]
Examples of the acrylic resin include acrylics such as polymethyl (meth) acrylate, polybutyl (meth) acrylate, methyl (meth) acrylate-butyl (meth) acrylate copolymer, and methyl (meth) acrylate-styrene copolymer. Resin, or methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, octyl (meth) acrylate, cyclohexyl (meth) acrylate, etc., 2-hydroxyethyl (meth) acrylate, 2-hydroxy-3 An acrylic resin such as an acrylic polyol obtained by copolymerizing a (meth) acrylic acid ester having a hydroxyl group in a molecule such as phenoxypropyl (meth) acrylate is used alone or in combination of two or more. When an acrylic polyol is used, it may be cross-linked by adding an isocyanate such as 2,4-tolylene diisocyanate or 1,6-hexamethylene diisocyanate as necessary. (Meth) acrylate means acrylate or methacrylate.
[0036]
Moreover, it is also preferable from the point of adhesiveness to use an acrylic resin as a mixed resin with a vinyl chloride-vinyl acetate copolymer. As the vinyl chloride-vinyl acetate copolymer, those having a vinyl acetate content of about 5 to 20% by mass and an average degree of polymerization of about 350 to 900 are usually used. The vinyl chloride-vinyl acetate copolymer may be further copolymerized with a carboxylic acid such as maleic acid, fumaric acid or (meth) acrylic acid, if necessary.
The mixing ratio of the acrylic resin and the vinyl chloride-vinyl acetate copolymer is about acrylic resin / vinyl chloride-vinyl acetate copolymer = 1/9 to 9/1 (mass ratio).
[0037]
The pattern layer may be a functional layer such as a conductor layer or a magnetic layer in addition to a layer for decorative purposes such as a grain pattern. For example, in the conductor layer, conductive powder such as silver powder is dispersed instead of the colorant as a material to be contained in the binder of the specific resin. In the case of a magnetic layer, iron oxide (γ-Fe is used instead of the colorant.2OThree) Etc. are dispersed.
In other words, the decoration in the present invention includes adding a functional layer or an invisible pattern by a pattern layer. Examples of invisible patterns include a pattern printed with fluorescent ink that is transparent to visible light and emits fluorescence when irradiated with ultraviolet light, and a barcode printed with infrared absorbing ink.
[0038]
[Adhesive layer]
The adhesive layer 5 is appropriately selected from known adhesives depending on the resin used for these layers in consideration of adhesion to the first layer, the second layer, or the pattern layer with which the layer is in contact. Select and use. For example, when the thermoplastic resin of the first layer is an acrylic resin and the polyolefin resin of the second layer is a polypropylene resin, a curable urethane resin such as a polyester urethane resin gives preferable results. In addition, examples of the resin for the adhesive layer include thermoplastic resins such as vinyl acetate resin, vinyl chloride-vinyl acetate copolymer, thermoplastic polyester resin, polyamide resin, ionomer, chlorinated polyolefin resin, and thermoplastic urethane resin. Alternatively, a curable resin such as a phenol resin or an epoxy resin, or a rubber-based resin is used alone or as a mixture of two or more.
[0039]
As the curable urethane resin, a two-component curable urethane resin, a one-component curable (moisture curable) urethane resin, or the like may be used. In the case of a two-component curable urethane resin, a polyol is a main component and a polyvalent isocyanate is a cross-linking agent. Examples of the polyol include acrylic polyol, polyester polyol, polycarbonate polyol, polyether polyol, and polyurethane polyol. Examples of the polyvalent isocyanate include 2,4-tolylene diisocyanate, xylene diisocyanate, diphenylmethane-4,4′-diisocyanate, and the like. An aliphatic (or alicyclic) isocyanate such as aromatic isocyanate, 1,6-hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, or the like is used. Alternatively, as the isocyanate, a multimer or adduct of these isocyanates may be used.
[0040]
One-component curable (moisture curable) urethane resin is a composition containing a prepolymer having an isocyanate group at the molecular end as an essential component. The prepolymer is usually a polyisocyanate prepolymer in which one or more isocyanate groups are provided at both ends of the molecule by the reaction of the polyol or isocyanate. The isocyanate groups react with each other with moisture in the air to cause a chain extension reaction. As a result, a reaction product having a urea bond in the molecular chain is generated, and the isocyanate group at the molecular end further reacts with the urea bond. Then, the biuret bond is caused to branch to cause a crosslinking reaction.
[0041]
The adhesive layer can be formed by a known printing or coating method such as gravure printing or roll coating using an ink (or coating liquid) containing the resin as described above. Although there is no restriction | limiting in particular in the thickness of an adhesive bond layer, For example, it is about 5-20 micrometers.
As for the adhesive layer, the second layer (or as a laminate with the third layer, etc.) is laminated at the same time as the film is formed by extrusion on the surface of the first layer on which the pattern layer is formed. In this case, the second layer can be omitted by bonding by heat fusion. However, a first layer resin sheet on which a pattern layer is formed, and a laminate (laminated sheet) obtained by laminating a second layer and a third layer by a two-layer coextrusion method are prepared separately. When laminating by the dry lamination method, the adhesive layer is used for adhesion lamination. In this case, the adhesive layer is on the first layer (picture layer) side, the second layer side, or both.
In addition, the surface to be bonded with the adhesive layer may be subjected to easy adhesion treatment such as corona discharge treatment, plasma treatment, and primer coating in order to enhance the adhesion as necessary.
[0042]
Lamination method of decorative molding sheet on adherend:
As a method of laminating the decorative molding sheet of the present invention on an adherend, a laminating method in which the sheet is heat-softened and molded is preferable in that the effects of the present invention can be exhibited and enjoyed. . The adherend is preferably a resin molded product made of an ABS resin in terms of adhesion of the sheet. By stacking the decorative molding sheet on the adherend, a decorative molded product is obtained as a laminate of the adherend and the decorative molding sheet. Specific methods for forming and laminating a decorative molding sheet include, for example, (1) injection molding simultaneous decorating method, (2) vacuum molding laminating method and the like. These will be further described below.
[0043]
(1) Injection molding simultaneous decorating method: After arranging a decorative molding sheet between both male and female molds for injection molding as described in Japanese Patent Publication No. 50-19132, Japanese Patent Publication No. 43-27488, etc. This is a method in which a resin in a fluid state is injected and filled into a mold, and a decorative molding sheet is laminated on the surface simultaneously with the molding of a resin molding. The decorative molding sheet is molded by the injection mold itself or an external mold.
(2) Vacuum forming lamination method: as described in Japanese Patent Publication No. 56-45768 (overlay method), Japanese Patent Publication No. 60-58014 (vacuum press method), etc. A method in which a decorative molding sheet is opposed or placed on the surface of the substrate with an adhesive in between, and the decorative molding sheet is molded by a pressure difference due to vacuum suction from the adherend side and laminated on the adherend. It is.
[0044]
Next, among the above, particularly the injection molding simultaneous decorating method will be described in more detail.
[0045]
First, in the injection molding simultaneous lamination method, the decorative molding sheet receives the thermal pressure from the injection resin even when the decorative molding sheet is not preheated. Therefore, the injection molding simultaneous decorating method is suitable for both the form in which the preforming of the decorative molding sheet is performed and the form in which it is not performed. Further, the decorative molding sheet may or may not be preheated. In addition, at the time of preliminary molding, the decorative molding sheet is usually preheated.
[0046]
Of course, when the decorative molding sheet has a large aperture, it is preferable to perform preliminary molding. On the other hand, in the case where the decorative molding sheet has a small aperture, the decorative molding sheet may be molded with the resin pressure and resin heat of the injected resin in a fluid state. At this time, if the squeezing is shallow, the decorative molding sheet may be molded only by the resin pressure and resin heat of the resin in a fluid state filled in the mold at the same time as the resin injection without preforming. In addition, even when a decorative molding sheet is molded with resin pressure and resin heat, the decorative molding sheet may be heated only using the resin heat of the injection resin and not preheated. In addition, the preforming of the decorative molding sheet is usually performed by using the injection mold as a vacuum mold, but before supplying the decorative molding sheet between the molds, another molding is performed outside the injection mold. Preliminary molding (offline preliminary molding) in which a decorative molding sheet is vacuum molded with a vacuum mold may be used. However, the pre-molding is preferably performed by using both the injection mold and the vacuum mold in that the decorative molding sheets can be laminated efficiently and accurately. However, when preliminarily molded decorative molding sheets are produced 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.
[0047]
With reference to the conceptual diagram of FIG. 3, the injection molding simultaneous decorating method will be described in one form. In the form shown in the figure, a vacuum forming die that is a different mold from the injection molding die, and after the decorative molding sheet is heated and softened and preformed, the molded decorative molding sheet is injected into the injection molding die. After being inserted into the mold, the mold is clamped and the resin is injected. Next, the injection molding simultaneous decorating method in this embodiment will be further described with reference to FIG.
Moreover, this form is a more preferable form when the drawing of the decorative molding sheet is deep among the various combinations of pre-molding and preheating of the decorative molding sheet.
[0048]
First, as shown in FIG. 3A, a decorative molding sheet softened by heating with a heater 32 is preformed by vacuum molding using a vacuum molding die Mv having suction means such as suction holes 31 on the mold surface. The vacuum forming die Mv is made of a metal such as iron or aluminum, or ceramics. Further, the decorative molding sheet S is appropriately fixed by a frame-shaped sheet clamp 33. At this time, the third layer side of the decorative molding sheet is oriented to the injection resin side (upward in the drawing). The heat softening by the heater 32 is, for example, non-contact radiation heating, but may be conductive heating by contact. In the pre-molding, vacuum molding is performed by suction from the suction holes, and the decorative molding sheet is vacuum-molded along the mold surface of the vacuum molding die Mv. Note that the vacuum forming may be vacuum / pressure forming using pressure air together, and includes this.
[0049]
Next, the preformed decorative molding sheet S is supplied between a pair of injection molds Ma and Mb as shown in FIG. Here, the injection mold Ma has a runner and a gate that communicate with the injection nozzle, and the injection mold Mb has the same or substantially the same cavity surface as that of the preforming mold Mv. It forms a shape and becomes a mold for fixing a preformed decorative molding sheet. These molds are made of metal such as iron or ceramics. In the mold open state, the decorative molding sheet S is supplied between both molds Ma and Mb, and the decorative molding sheet S is fixed to the mold Mb by pressing it with a frame-shaped sheet clamp 34. In this case, it is a matter of course that the third layer side of the decorative molding sheet is the injection resin side on the right side of the drawing. Next, both molds are clamped as shown in FIG. 3C, and a cavity formed by both molds is filled with a resin in a fluid state such as a heat-melted state. And after resin solidifies by cooling etc., a mold is opened and a molding is taken out. In addition, if there is an unnecessary portion of the decorative molding sheet, if it is appropriately trimmed, the decorative molding sheet S is laminated on the surface of the resin molded product 6 as shown in the cross-sectional view of FIG. This is a decoration method in which a decorative molded product P is obtained.
[0050]
In the above process, heat and pressure are applied to the decorative molding sheet during pre-molding (or even during resin injection). At this time, if the decorative molding sheet absorbs moisture, its moisture vaporizes. Swells and causes problems. In particular, in the preforming step, it is necessary to heat and soften to such an extent that a decorative molding sheet can be formed, and swelling tends to occur.
[0051]
Decorative molded products:
Next, the decorative molded product according to the present invention is a resin in which the decorative molding sheet S having the above-described configuration is made of an ABS resin, such as a decorative molded product P whose one form is illustrated in the cross-sectional view of FIG. This is a molded product having a layer structure as laminated on the surface of the molded product 6. In addition, in the same figure, although illustration of the sheet | seat inner layer structure of the sheet | seat S for decorative molding is abbreviate | omitted, this part is a structure as illustrated in sectional drawing of FIG. The decorative molding sheet S is laminated on the resin molded product 6 with the third layer 3 side facing the resin molded product 6 side.
The decorative molding sheet S may be laminated on the resin molded product 6 by a vacuum molding lamination method or the like, but it can be performed simultaneously with the molding of the resin molded product and the productivity can be improved. It is preferable to carry out by a decoration method.
[0052]
In addition, in the ABS resin which comprises a resin molding, you may use resin colored by adding a coloring agent suitably according to a use. As the colorant, a known colorant as described in the above pattern layer may be used. Further, in the resin, various known additives such as silica, alumina, talc, calcium carbonate, aluminum hydroxide and other inorganic powders, fillers such as glass fibers, stabilizers, lubricants, elastomers and the like are appropriately added as necessary. Contain.
Further, the resin of the resin molded product is mainly ABS resin, but other resins may be mixed within the range of subcomponents.
[0053]
In addition, the shape of the decorative molded product is usually a three-dimensional object in which the lamination surface of the decorative molding sheet is a non-planar surface such as an uneven surface. However, the decorative molded product of the present invention does not exclude a three-dimensional object in which the laminated surface of the decorative molding sheet is flat but the other surface is non-planar, and a plate-like object in which the laminated surface is flat. In the process of lamination on a flat surface, a decorative molding sheet may be formed and stretched. Further, the overall shape of the decorative molded product is arbitrary such as a plate shape (flat plate, curved plate), a column shape, a three-dimensional solid object, and the like.
[0054]
Applications for decorative molding sheets and decorative molded products:
In addition, although the use of decorative articles, such as a decorative molded product surface-decorated with the above-mentioned decorative molding sheet, is arbitrary, for example, interior materials or exterior materials for vehicles such as automobiles, baseboards, and rims Such as construction materials such as window frames and door frames, interior materials for buildings such as walls, floors, and ceilings, housings and containers for home appliances such as television receivers and air conditioners.
[0055]
【Example】
Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
[0056]
[Example 1]
A decorative molding sheet S having the structure shown in the cross-sectional view of FIG. 1B was produced as follows.
First, as a non-colored and transparent resin sheet for the first layer 1, a resin sheet having a thickness of 125 μm containing polymethyl methacrylate (PMMA) as a main component was prepared. Then, on the back side of the resin sheet, a mixed resin of an acrylic resin containing butyl methacrylate as a binder resin and a vinyl chloride-vinyl acetate copolymer is used, and quinacridone red, isoindolinone, phthalocyanine blue are used as colorants. And the pattern layer 4 which expressed the pattern of the grain of wood with the coloring ink using carbon black was formed by the gravure printing method, and the printing sheet was obtained.
[0057]
  On the other hand, a laminated sheet was prepared by laminating the second layer 2 and the third layer 3 simultaneously with film formation by the two-layer coextrusion method. At this time, the second layer 2 was formed in a two-layer structure of a surface layer 2A and a back layer 2B as shown in FIG. The two-layer coextrusion method is two-coextrusion in the sense that the two layers of the second layer and the third layer are extruded together.In the stratumStrictly speaking, this includes the three-layer coextrusion method. For the surface layer 2A of the second layer 2, a polypropylene-based olefinic thermoplastic elastomer (with no coloring pigment and filler added) obtained by blending 60 parts by mass of polypropylene with 40 parts by mass of elastomer was used. In the back layer 2B of the second layer 2, 70 parts by mass of a polypropylene-based olefin-based thermoplastic elastomer obtained by blending 30 parts by mass of an elastomer with 40 parts by mass of a polypropylene resin, 10 parts by mass of a color pigment, and talc as a filler. A colored concealing resin added with 20 parts by mass was used. Further, for the third layer 3, a resin in which 100 parts by mass of ABS resin, 50 parts by mass of polypropylene resin, and 10 parts by mass of epoxidized SBS as a compatibilizing agent were added (color pigments and fillers were not added) was used. In addition, the thickness of these three layers is surface layer 2A / back layer 2B / third layer 3 = 30 μm / 290 μm / 30 μm, and the thickness as a laminated sheet is 350 μm.
[0058]
And the adhesive which consists of a polyester-type curable urethane resin is 10 g / m in solid content on the surface at the pattern layer side of the said printing sheet.2It apply | coated and bonded together with the surface by the side of the 2nd layer 2 side of the said lamination sheet by the dry lamination method. Thereafter, curing was performed at 40 ° C. for 3 days to obtain a desired decorative molding sheet S.
[0059]
[Comparative Example 1]
In Example 1, a simple ABS resin sheet having a thickness of 350 μm and colored and concealed with a color pigment and a filler was used in the same manner as in Example 1 instead of the laminated sheet to be bonded to the printing sheet. A molding sheet was prepared.
[0060]
[Performance evaluation]
The decorative molding sheets obtained in the examples and comparative examples were subjected to a moisture absorption acceleration test in a form in which the sheets were left to stand in an environment of 40 ° C. and 90% RH for one day, and then the sheets were heated and softened and molded by preforming. A decorative molded product was produced by the simultaneous injection molding decoration method, and the presence or absence of blistering at that time was evaluated.
[0061]
That is, the simultaneous injection molding decoration is performed by using ABS resin as the injection resin by the injection molding simultaneous decoration method adopting the off-line preforming mode as shown in the conceptual explanatory diagram of FIG. Is used to obtain a decorative molded product P in which the decorative molding sheet S is laminated on the resin molded product 6 as shown in the cross-sectional view of FIG. It was.
[0062]
Specifically, the simultaneous injection molding decoration has the same cavity surface as the injection-molded female mold Mb as shown in FIG. 3A, but on the vacuum mold Mv separate from the female mold Mb. Further, after the decorative molding sheet S is heated and softened to a surface temperature of 170 ° C. in a non-contact state by a heater 32 composed of an infrared radiation type hot platen, the suction formed in the vacuum forming die Mv. Vacuum suction was performed from the hole 31, preformed on the cavity surface of the vacuum mold Mv, and cooled, and the preformed decorative molding sheet was demolded. Then, as shown in FIG. 3 (B), this preformed decorative molding sheet S is used for injection molding by the sheet clamp 34 with the third layer side facing the male mold Ma side for injection molding. 3C, the male and female molds are clamped as shown in FIG. 3 (C), and the ABS resin melted by heating in the cavity formed by the male and female molds is injected and filled and cooled and solidified. After the decorative molded product integrated with the decorative molding sheet, both the male and female molds were opened, and the decorative molded product was taken out.
[0063]
As a result of the above, in the case where the decorative molding sheet of Example 1 was used, swelling did not occur, and the surface of the decorative molded product, that is, the surface of the decorative molded sheet after molding had good specularity. It was. On the other hand, when the decorative molding sheet of Comparative Example 1 was used, swelling due to foaming between the first layer and the second layer occurred over the entire surface. As a result, the specularity of the surface was not sufficient.
In addition, the decorative molding sheet of Example 1 has the third layer as a two-layer structure, and the second layer side is a layer to which no filler or coloring pigment is added. The surface of the decorative molding sheet did not have a crushed skin and had good specularity.
[0064]
【The invention's effect】
(1) According to the decorative molding sheet of the present invention, swelling during sheet molding due to the hygroscopicity of the ABS resin can be eliminated while securing the adhesion of the ABS resin to the resin molded product. A feeling of painting is also obtained.
(2) Furthermore, if the second layer and the third layer are laminated by the two-layer coextrusion method, the third layer is laminated on the already formed second layer by the extrusion method or the like. It becomes a decorative molding sheet that does not require a process and can be manufactured easily and at low cost. In addition, the interlayer adhesion between the third layer and the second layer can be more easily obtained.
(3) Moreover, if a picture layer and an adhesive layer are laminated on the back surface of the first layer, the design layer can make a high design, and the first layer and the second layer on which the picture layer has been formed by the adhesive layer. Alternatively, the second layer and the third layer can be laminated with good adhesion.
(4) According to the decorative molded product of the present invention, the adhesion between the ABS resin molded product and the decorative molding sheet is good, and there is no occurrence of swelling during sheet molding at the decorative molding sheet portion. Each effect obtained with the decorative molding sheet can be enjoyed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a form example of a decorative molding sheet according to the present invention.
FIG. 2 is a cross-sectional view illustrating one embodiment of a decorative molded product according to the present invention.
FIG. 3 is a conceptual diagram illustrating an injection molding simultaneous decorating method as one application example of the decorative molding sheet of the present invention.
[Explanation of symbols]
1st layer
2 Second layer
2A surface layer
2B Back layer
2C center layer
3 Third layer
4 pattern layers
5 Adhesive layer
6 Resin molding
31 Suction hole
32 Heater
33 Sheet clamp
34 Sheet clamp
Ma injection mold (male mold)
Mb injection mold (female)
Mv vacuum mold
P decorative molded product
S sheet for decorative molding

Claims (7)

表側から順に、透明な熱可塑性樹脂からなる第一層と、ポリオレフィン系樹脂からなる第二層と、アクリロニトリル−ブタジエン−スチレン共重合体樹脂とポリオレフィン系樹脂と相溶化剤としてエポキシ化SBS(スチレン−ブタジエン−スチレンブロック共重合体のブタジエン部分の不飽和二重結合の一部をエポキシ化した化合物)との混合樹脂からなる第三層が、積層されてなり、且つ第二層と第三層とは接して積層されてなる、加飾成形用シート。In order from the front side, a first layer made of a transparent thermoplastic resin, a second layer made of a polyolefin resin, an acrylonitrile-butadiene-styrene copolymer resin, a polyolefin resin, and an epoxidized SBS (styrene- A third layer made of a mixed resin with a compound obtained by epoxidizing a portion of the unsaturated double bond of the butadiene portion of the butadiene-styrene block copolymer) , and the second layer and the third layer. Is a decorative molding sheet that is laminated in contact. ポリオレフィン系樹脂がポリプロピレン樹脂であり、アクリロニトリル−ブタジエン−スチレン共重合体樹脂/ポリオレフィン系樹脂/相溶化剤の割合が質量比で、100/30〜80/5〜20である、請求項1記載の加飾成形用シート。The polyolefin resin is a polypropylene resin, and the ratio of acrylonitrile-butadiene-styrene copolymer resin / polyolefin resin / compatibilizer is 100/30 to 80/5 to 20 in mass ratio. Decorative molding sheet. 第二層と第三層とが2層共押出法で積層されてなる、請求項1又は2記載の加飾成形用シート。The decorative molding sheet according to claim 1 or 2 , wherein the second layer and the third layer are laminated by a two-layer coextrusion method. 第二層が、表層と裏層の2層構成である、請求項1〜3のいずれか記載の加飾成形用シート。The decorative molding sheet according to any one of claims 1 to 3, wherein the second layer has a two-layer structure of a surface layer and a back layer. 第二層の表層と第二層の裏層と第三層とが、3層共押出法で積層されてなる、請求項4記載の加飾成形用シート。The decorative molding sheet according to claim 4, wherein the surface layer of the second layer, the back layer of the second layer, and the third layer are laminated by a three-layer coextrusion method. 第一層の裏面に、絵柄層及び接着剤層がこの順に積層されてなる、請求項1〜5のいずれか記載の加飾成形用シート。The rear surface of the first layer, picture layer and an adhesive layer are laminated in this order, decorative molding sheet according to any one of claims 1-5. アクリロニトリル−ブタジエン−スチレン共重合体樹脂からなる樹脂成形物の表面に、請求項1〜のいずれか1項に記載の加飾成形用シートが、その第三層側を該樹脂成形物側に向けて積層されてなる、加飾成形品。The decorative molding sheet according to any one of claims 1 to 6 , on the surface of a resin molded product made of acrylonitrile-butadiene-styrene copolymer resin, the third layer side of the resin molded product side. A decorative molded product that is laminated to the front.
JP2002077871A 2002-03-20 2002-03-20 Decorative molding sheet and decorative molded product Expired - Fee Related JP4121759B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002077871A JP4121759B2 (en) 2002-03-20 2002-03-20 Decorative molding sheet and decorative molded product

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002077871A JP4121759B2 (en) 2002-03-20 2002-03-20 Decorative molding sheet and decorative molded product

Publications (2)

Publication Number Publication Date
JP2003266615A JP2003266615A (en) 2003-09-24
JP4121759B2 true JP4121759B2 (en) 2008-07-23

Family

ID=29205859

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002077871A Expired - Fee Related JP4121759B2 (en) 2002-03-20 2002-03-20 Decorative molding sheet and decorative molded product

Country Status (1)

Country Link
JP (1) JP4121759B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI802588B (en) * 2018-09-04 2023-05-21 鉅鋼機械股份有限公司 Molded Bonding Method

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4815622B2 (en) * 2007-01-18 2011-11-16 株式会社サカイヤ Method for producing synthetic resin molded article with improved decoration
JP2008183848A (en) * 2007-01-31 2008-08-14 Sanwa Screen Meiban:Kk Manufacturing method of operation panel
WO2018225780A1 (en) * 2017-06-06 2018-12-13 株式会社クラレ Multilayer film and method for producing same
WO2019054397A1 (en) 2017-09-12 2019-03-21 出光ユニテック株式会社 Laminate, molded article, and method for producing molded article

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI802588B (en) * 2018-09-04 2023-05-21 鉅鋼機械股份有限公司 Molded Bonding Method

Also Published As

Publication number Publication date
JP2003266615A (en) 2003-09-24

Similar Documents

Publication Publication Date Title
US6416866B1 (en) Molded article and surface covering sheet therefor
JP3998957B2 (en) Injection molding simultaneous decoration sheet and decorative molded product
JP4121759B2 (en) Decorative molding sheet and decorative molded product
JP4287014B2 (en) Injection molding simultaneous painting sheet and injection molding simultaneous painting method
JP4249318B2 (en) Injection molding simultaneous painting sheet and painting molding
JP4202490B2 (en) Decorative molded products
JP4662399B2 (en) Decorative sheet, decorative molded product, and injection molding simultaneous decoration method
JP4962612B2 (en) Decorative sheet manufacturing method, decorative molded product, and injection molding simultaneous decoration method
JP2946573B2 (en) Method for producing synthetic resin molded article having surface protective film and surface protective layer
JP2002283506A (en) Decorative sheet
JP4268378B2 (en) Injection molding simultaneous decoration method
JP2002264169A (en) Decorative sheet and in-mold decorating injection molding method
JP4743360B2 (en) Cosmetic sheet for simultaneous injection-molding with injection molding and method for simultaneous injection-molding with injection molding using the same
JP2002011754A (en) Injection molding in-mold decorating sheet
JP4157291B2 (en) Decorative sheet and decorative molded product
JP2003311898A (en) Sheet for decorative molding and decorative molded product
JP4659967B2 (en) Method for producing sheet for simultaneous injection molding and resin molded product
JP4601847B2 (en) Decorative sheet and manufacturing method thereof
JP4383460B2 (en) Manufacturing method of decorative molded products
JP4273209B2 (en) Decorative sheet and laminate
JP4629749B2 (en) Sheet for simultaneous injection-molding, painting molded product, and method for manufacturing sheet for simultaneous injection-molding
JP3979819B2 (en) Manufacturing method of decorative molded products
JP4601783B2 (en) Decorative sheet and method for producing the same
JPH11277695A (en) Molded product
JP2001260169A (en) Injection molding in-mold decorating sheet

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20050316

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20070507

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20070807

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20071004

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20080403

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20080430

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110509

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Ref document number: 4121759

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120509

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120509

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130509

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140509

Year of fee payment: 6

LAPS Cancellation because of no payment of annual fees