JP5302683B2 - レーザー溶着用樹脂組成物及び成形品 - Google Patents
レーザー溶着用樹脂組成物及び成形品 Download PDFInfo
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- JP5302683B2 JP5302683B2 JP2008534310A JP2008534310A JP5302683B2 JP 5302683 B2 JP5302683 B2 JP 5302683B2 JP 2008534310 A JP2008534310 A JP 2008534310A JP 2008534310 A JP2008534310 A JP 2008534310A JP 5302683 B2 JP5302683 B2 JP 5302683B2
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
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- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
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Description
2…レーザー光
3…試験片A
4…試験片B
(A)ポリブチレンテレフタレート系樹脂
ベース樹脂としてのポリブチレンテレフタレート系樹脂(PBT系樹脂)としては、ブチレンテレフタレートを主成分(例えば、50〜100重量%、好ましくは60〜100重量%、さらに好ましくは75〜100重量%程度)とするホモポリエステル(ポリブチレンテレフタレート)又はコポリエステル(ブチレンテレフタレート系共重合体又はポリブチレンテレフタレートコポリエステル)などが挙げられる。
PBT系樹脂は、テレフタル酸又はその反応性誘導体と1,4−ブタンジオールと必要により共重合可能なモノマーとを、慣用の方法、例えば、エステル交換、直接エステル化法などにより共重合することにより製造できる。
コアシェル型ポリマー(コアシェル型エラストマー)は、コア層(コア部)と、このコア層(コア層の表面)の一部又は全部を被覆するシェル層とで構成された多層構造を有するポリマーである。コアシェル型ポリマーにおいて、コア層およびシェル層のうち、いずれか一方がゴム成分(軟質成分)で構成され、他方の成分が硬質成分で構成される。
本発明の樹脂組成物は、強度を必要とする場合、充填剤(又は補強材)(C)を含んでいてもよい。このような充填剤(C)には、繊維状補強材[例えば、無機質繊維(例えば、ガラス繊維、アスベスト繊維、カーボン繊維、シリカ繊維、アルミナ繊維、シリカ・アルミナ繊維、アルミニウムシリケート繊維、ジルコニア繊維、チタン酸カリウム繊維、炭化ケイ素繊維、ウィスカー(炭化ケイ素、アルミナ、窒化珪素などのウイスカー)など)、有機質繊維(例えば、脂肪族又は芳香族ポリアミド、芳香族ポリエステル、フッ素樹脂、ポリアクリロニトリルなどのアクリル樹脂、レーヨンなどで形成された繊維)など]、板状補強材[例えば、タルク、マイカ、ガラスフレーク、グラファイトなど]、粉粒状補強材[例えば、ガラスビーズ、ガラス粉、ミルドファイバー(例えば、ミルドガラスファイバーなど)など]、ウォラストナイト(珪灰石)などが含まれる。ウォラストナイトは、板状、柱状、繊維状などの形態であってもよい。繊維状補強材の平均径は、例えば、1〜50μm(好ましくは3〜30μm)程度、平均長は、例えば、100μm〜3mm(好ましくは300μm〜1mm、さらに好ましくは500μm〜1mm)程度であってもよい。また、板状又は粉粒状補強材の平均粒径は、例えば、0.1〜100μm、好ましくは0.1〜50μm(例えば、0.1〜10μm)程度であってもよい。これらの充填剤又は補強材は単独で又は二種以上組み合わせて使用できる。
ポリブチレンテレフタレート系樹脂組成物は、光透過性(又はレーザー溶着性)を改善するため、さらに、熱可塑性樹脂(第2の樹脂)を含んでいてもよい。この第2の樹脂としては、非晶質樹脂、例えば、ポリカーボネート(PC)系樹脂などが挙げられる。これらの第2の樹脂(D)は単独で又は二種以上組み合わせて使用できる。なお、樹脂組成物において、ポリブチレンテレフタレート系樹脂(A)と樹脂(D)とのモルホロジーは特に制限されず、均一樹脂系を形成してもよく分散系を形成してもよい。
本発明の成形体は、前記樹脂組成物から形成されており、優れたレーザー光透過性を示す。このような成形体は、ポリブチレンテレフタレート系樹脂(A)と、前記コアシェル型ポリマー(B)と、必要により補強材(C)及び/又は樹脂(D)などとで構成された樹脂組成物を慣用の方法、例えば、(1)各成分を混合して、一軸又は二軸の押出機により混練し押出してペレットを調製した後、成形する方法、(2)一旦、組成の異なるペレット(マスターバッチ)を調製し、そのペレットを所定量混合(希釈)して成形に供し、所定の組成の成形品を得る方法、(3)成形機に各成分の1又は2以上を直接仕込む方法などで製造できる。なお、ペレットは、例えば、脆性成分(ガラス系補強材など)を除く成分を溶融混合した後に、脆性成分(ガラス系補強材など)を混合することにより調製してもよい。
実施例及び比較例では、以下のPBT系樹脂(A)、エラストマー(B)、充填剤(C)、樹脂(D)及び添加剤を用いた。
(A−1)PBT樹脂:ポリブチレンテレフタレート(ウィンテックポリマー(株)製、DX2000)
(A−2)変性PBT樹脂:ジメチルイソフタル酸(DMI)変性PBT樹脂
テレフタル酸と1,4−ブタンジオールとの反応において、テレフタル酸の一部(12.5モル%)に代えて、共重合成分としてのジメチルイソフタル酸(DMI)12.5モル%を用い、変性ポリブチレンテレフタレートを調製した。
(B−1)アクリル系コアシェル型ポリマー(ロームアンドハースジャパン(株)製、パラロイドEXL5136)
(B−2)アクリル系コアシェル型ポリマー(ロームアンドハースジャパン(株)製、パラロイドEXL2311)
(B−3)アクリル系コアシェル型エラストマー(アルケマ(株)製、Durastrength D400R)。
(C−1)ガラス繊維(日東紡績(株)製「CS3J−948S」平均繊維径φ11μmチョップドストランド、平均繊維長400μm)
熱可塑性樹脂(D)
(D−1)PC:ポリカーボネート樹脂(帝人化成(株)製,「パンライトL−1225」)
表1に示す割合で、2軸押出機(日本製鋼所(株)製,30mmφ)により250℃にて混練し、ペレットを作製した。得られたペレットを用いて射出成形機((株)東芝製)により、シリンダー温度260℃及び金型温度80℃の条件で、縦8cm×横8cm×厚み1.5mmのシート状成形体を成形し、このシート状成形体を10mmの短冊状に切り出し、試験片A(すなわち、縦8cm×横1cm×厚み1.5mm)を作成した。
引張試験機(オリエンテック製,RTC−1325PL)を用いて、レーザー溶着した試験片Aと試験片Bとを10mm/分で引張り、溶着強度を測定した。
分光光度計(日本分光(株)製,V570)を用いて、波長940nmでの試験片Aの光線透過率を測定した。
前記試験片Aの中央部を切削し、この切削部を115℃のキシレン中に2.5時間浸漬してエッチング処理した。そして、切削部厚み方向の中央部分を電子顕微鏡で3箇所破面観察し、各観察点についてコアシェル型エラストマーが脱離して形成された孔の径を粒子径(分散径)とし、任意の10個について分散径の測定を行い、これらの分散径から平均分散径を測定した。
ペレットを用い、樹脂温度270℃、金型温度65℃、射出時間25秒、冷却時間10秒で、試験片成形用金型(縦22mm×横22mm×高さ51mmの角柱内部に、縦18mm×横18mm×高さ30mmの鉄芯をインサートする金型)に、一部の樹脂成形部の最小肉厚が1mmとなるようにインサート射出成形し、インサート成形品を製造した。得られたインサート成形品について、冷熱衝撃試験機を用いて140℃にて1時間30分加熱後、−40℃に降温して1時間30分冷却後、さらに140℃に昇温する過程を1サイクルとする高低温衝撃試験を行い、成形品にクラックが入るまでのサイクル数を測定し、高低温衝撃性を評価した。
Claims (8)
- ポリブチレンテレフタレート系樹脂(A)と、コアシェル型ポリマー(B)とで構成されているレーザー溶着用ポリブチレンテレフタレート系樹脂組成物であって、
コアシェル型ポリマー(B)のコア層が、アクリル系ゴムで構成され、
コアシェル型ポリマー(B)が樹脂組成物中に分散し、
コアシェル型ポリマー(B)の平均分散径が2〜10μmであり、
コアシェル型ポリマー(B)の割合が、樹脂(A)100重量部に対して、1〜50重量部である樹脂組成物。 - ポリブチレンテレフタレート系樹脂(A)が、ホモポリエステル、45モル%以下の共重合性モノマーで変性されたコポリエステル、又はこれらの混合物である請求項1記載の樹脂組成物。
- コアシェル型ポリマー(B)の平均分散径が3〜10μmであり、コアシェル型ポリマー(B)の割合が樹脂(A)100重量部に対して5〜30重量部である請求項1または2記載の樹脂組成物。
- さらに、補強剤(C)を含む請求項1〜3のいずれか一項に記載の樹脂組成物。
- 補強剤(C)の割合が、樹脂(A)100重量部に対して10〜120重量部である請求項4記載の樹脂組成物。
- さらに、ポリカーボネート系樹脂を含む請求項1〜5のいずれか一項に記載の樹脂組成物。
- ポリカーボネート系樹脂の割合が、樹脂(A)100重量部に対して、3〜20重量部である請求項6記載の樹脂組成物。
- 請求項1〜7のいずれか一項に記載の樹脂組成物で形成されたレーザー透過性樹脂成形品と、レーザー光を吸収可能なレーザー吸収性樹脂で形成された成形品とがレーザー溶着により接合されている複合成形品。
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2007
- 2007-09-06 US US12/440,528 patent/US8142900B2/en not_active Expired - Fee Related
- 2007-09-06 CN CN2007800288534A patent/CN101501134B/zh not_active Expired - Fee Related
- 2007-09-06 WO PCT/JP2007/067412 patent/WO2008032636A1/ja active Application Filing
- 2007-09-06 JP JP2008534310A patent/JP5302683B2/ja active Active
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WO2003085046A1 (fr) * | 2002-04-08 | 2003-10-16 | Win Tech Polymer Ltd. | Composition de resine a base de polyterephtalate de butylene pour assemblage par fusion au laser et article moule |
JP2004315805A (ja) * | 2003-03-28 | 2004-11-11 | Wintech Polymer Ltd | レーザー溶着用樹脂組成物及び成形品 |
WO2005035657A1 (ja) * | 2003-10-07 | 2005-04-21 | Wintech Polymer Ltd. | レーザ溶着用樹脂組成物及び成形品 |
JP2006176691A (ja) * | 2004-12-24 | 2006-07-06 | Wintech Polymer Ltd | 振動溶着用ポリブチレンテレフタレート樹脂組成物 |
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WO2008032636A1 (fr) | 2008-03-20 |
CN101501134B (zh) | 2012-02-22 |
US8142900B2 (en) | 2012-03-27 |
JPWO2008032636A1 (ja) | 2010-01-21 |
US20090324977A1 (en) | 2009-12-31 |
CN101501134A (zh) | 2009-08-05 |
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