JP6058281B2 - ポリエステル系エラストマー発泡体及び発泡部材 - Google Patents
ポリエステル系エラストマー発泡体及び発泡部材 Download PDFInfo
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- JP6058281B2 JP6058281B2 JP2012107289A JP2012107289A JP6058281B2 JP 6058281 B2 JP6058281 B2 JP 6058281B2 JP 2012107289 A JP2012107289 A JP 2012107289A JP 2012107289 A JP2012107289 A JP 2012107289A JP 6058281 B2 JP6058281 B2 JP 6058281B2
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- Prior art keywords
- polyester elastomer
- polyester
- foam
- weight
- epoxy
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Description
本発明の他の目的は、ポリエステル系エラストマー発泡体が用いられている電気又は電子機器用の発泡部材を提供することにある。
本発明のポリエステル系エラストマー発泡体は、ポリエステル系エラストマー組成物を発泡させることにより形成される。該ポリエステル系エラストマー組成物は、融点が180〜240℃であるポリエステル系エラストマーとエポキシ変性ポリマーとを少なくとも含む。なお、本願では、融点が180〜240℃であるポリエステル系エラストマーを、「本発明のポリエステル系エラストマー」と称する場合がある。
見掛け密度(g/cm3)=(試験片の質量重量)/(試験片の体積)
圧縮永久歪(%)={(a−c)/(a−b)}×100
a:発泡体のもとの厚さ
b:50%圧縮状態の発泡体の厚さ
c:所定の温度の条件下で、24時間、50%圧縮状態を維持してから圧縮状態を解放した後の発泡体の厚さ
本発明の発泡部材は、上記ポリエステル系エラストマー発泡体を含む部材である。上記発泡部材の形状は、特に限定されないが、シート状(フィルム状を含む)、テープ状が好ましい。また、上記発泡部材は、例えば、上記ポリエステル系エラストマー発泡体のみからなる構成であってもよいし、上記ポリエステル系エラストマー発泡体に他の層(特に粘着剤層(粘着層)、基材層など)が積層されている構成であってもよい。
ハードセグメントとしてのポリブチレンテレフタレートとソフトセグメントとしてのポリエーテルとのブロック共重合体(商品名「ハイトレル5577」、東レ・デュポン株式会社製、230℃のメルトフローレート:1.8g/10min、融点:208℃):100重量部、アクリル系滑剤(商品名「メタブレンL−1000」、三菱レイヨン株式会社製):5重量部、シランカップリング剤で表面処理されたハードクレイ(商品名「ST−301」、白石カルシウム株式会社製):1重量部、カーボンブラック(商品名「旭♯35」、旭カーボン株式会社製):5重量部及びエポキシ系改質剤(エポキシ変性アクリル系ポリマー、重量平均分子量(Mw):50000、エポキシ当量:1200g/eq、粘度:2850mPa・s):2重量部を二軸混練機により、220℃の温度で混練した後、ストランド状に押出し、水冷後ペレット状に切断して成形した。このペレットを単軸押出機に投入し、240℃の雰囲気中、17(注入後13)MPの圧力で二酸化炭素ガスを注入した。二酸化炭素ガスを十分飽和させた後、発泡に適した温度まで冷却後、ダイから押出して、厚さが2.0mmのシート状のポリエステル系エラストマー発泡体を得た。
なお、二酸化炭素ガスの混合量は、ペレット全量(100重量%)に対して3.2重量%であった。
ハードセグメントとしてのポリブチレンテレフタレートとソフトセグメントとしてのポリエーテルとのブロック共重合体(商品名「ハイトレル5577」、東レ・デュポン株式会社製、230℃のメルトフローレート:1.8g/10min、融点:208℃):100重量部、アクリル系滑剤(商品名「メタブレンL−1000」、三菱レイヨン株式会社製):5重量部、シランカップリング剤で表面処理されたハードクレイ(商品名「ST−301」、白石カルシウム株式会社製):5重量部、カーボンブラック(商品名「旭♯35」、旭カーボン株式会社製):5重量部及びエポキシ系改質剤(エポキシ変性アクリル系ポリマー、重量平均分子量(Mw):50000、エポキシ当量:1200g/eq、粘度:2850mPa・s):3重量部を、二軸混練機により、220℃の温度で混練した後、ストランド状に押出し、水冷後ペレット状に切断して成形した。このペレットを単軸押出機に投入し、240℃の雰囲気中、17(注入後13)MPaの圧力で二酸化炭素ガスを注入した。二酸化炭素ガスを十分飽和させた後、発泡に適した温度まで冷却後、ダイから押出して、厚さが1.7mmのシート状のポリエステル系エラストマー発泡体を得た。
なお、二酸化炭素ガスの混合量は、ペレット全量(100重量%)に対して3.1重量%であった。
実施例1と同様にして、ペレットを作製した。次に、実施例1と同様にして、厚さ1.7mmのシート状のポリエステル系エラストマー発泡体を得た。
なお、二酸化炭素ガスの混合量は、ペレット全量(100重量%)に対して3.5重量%であった。
実施例1と同様にして、ペレットを作製した。次に、実施例1と同様にして、厚さ2.1mmのシート状のポリエステル系エラストマー発泡体を得た。
なお、二酸化炭素ガスの混合量は、ペレット全量(100重量%)に対して3.0重量%であった。
ポリプロピレン(メルトフローレート(MFR):0.35g/10min):45重量部、ポリオレフィン系エラストマー(メルトフローレート(MFR):6g/10min、JIS A硬度:79°):55重量部、水酸化マグネシウム:10重量部、カーボン(商品名「旭♯35」、旭カーボン株式会社製):10重量部及びステアリン酸モノグリセリド:1重量部を、単軸押出機に投入した。220℃の雰囲気下、13(注入後は12)MPaの圧力で、二酸化炭素ガスを注入した。二酸化炭素ガスを十分飽和させた後、発泡に適した温度まで冷却後、ダイから押出して、厚さが2.2mmのシート状のポリオレフィン系エラストマー発泡体を得た。
なお、二酸化炭素ガスの混合量は、ペレット全量(100重量%)に対して5.0重量%であった。
ハードセグメントとしてのポリブチレンテレフタレートとソフトセグメントとしてのポリエーテルとのブロック共重合体(商品名「ハイトレル5577」、東レ・デュポン株式会社製、230℃のメルトフローレート:1.8g/10min、融点:208℃):100重量部、アクリル系滑剤(商品名「メタブレンL−1000」、三菱レイヨン株式会社製):5重量部、ポリプロピレン(230℃のメルトフローレート:0.35g/10min):1重量部、カーボンブラック(商品名「旭♯35」、旭カーボン株式会社製):5重量部及びエポキシ系架橋剤(3官能エポキシ化合物、商品名「TEPIC−G」、日産化学工業株式会社製、融点:90〜125℃、エポキシ当量:110g/eq、粘度:100cp以下、分子量297):0.5重量部を、二軸混練機により、220℃の温度で混練した後、ストランド状に押出し、水冷後ペレット状に切断して成形した。このペレットを単軸押出機に投入し、240℃の雰囲気中、17(注入後13)MPaの圧力で二酸化炭素ガスを注入した。二酸化炭素ガスを十分飽和させた後、発泡に適した温度まで冷却後、ダイから押出して、厚さが2.2mmのシート状のポリエステル系エラストマー発泡体を得た。
なお、二酸化炭素ガスの混合量は、ペレット全量(100重量%)に対して3.0重量%であった。
ハードセグメントとしてのポリブチレンテレフタレートとソフトセグメントとしてのポリエーテルとのブロック共重合体(商品名「ハイトレル5577」、東レ・デュポン株式会社製、230℃のメルトフローレート:1.8g/10min、融点:208℃):100重量部、アクリル系滑剤(商品名「メタブレンL−1000」、三菱レイヨン株式会社製):5重量部、シランカップリング剤で表面処理されたハードクレイ(商品名「ST−301」、白石カルシウム株式会社製):1重量部、カーボンブラック(商品名「旭♯35」、旭カーボン株式会社製):5重量部及びカルボジイミド系架橋剤(商品名「LA−1」、日清紡ケミカル株式会社製):4重量部を、二軸混練機により、220℃の温度で混練した後、ストランド状に押出し、水冷後ペレット状に切断して成形した。このペレットを単軸押出機に投入し、240℃の雰囲気中、17(注入後13)MPaの圧力で二酸化炭素ガスを注入した。二酸化炭素ガスを十分飽和させた後、発泡に適した温度まで冷却後、ダイから押出して、厚さが0.6mmのシート状のポリエステル系エラストマー発泡体を得た。このポリエステル系エラストマー発泡体は、発泡が不十分であった。
なお、二酸化炭素ガスの混合量は、ペレット全量(100重量%)に対して3.0重量%であった。
実施例及び比較例について、下記の測定又は評価を行った。そして、その結果を、表1に示した。なお、比較例3は、発泡が不十分であり、厚さが薄いため、下記の50%圧縮時の反発力、圧縮永久歪等を求めなかった。
発泡体を、50mm×50mmサイズの打ち抜き刃型にて打ち抜き、シート状の試験片とした。該試験片の寸法をノギスにより測定した。これらの値から試験片の体積を算出した。次に、試験片の重量を電子天秤にて測定した。試験片の体積と試験片の重量から、次式より、発泡体の見掛け密度(g/cm3)を算出した。
発泡体の見掛け密度(g/cm3)=(試験片の重量)/(試験片の体積)
JIS K 6767に記載されている圧縮硬さ測定法に準じて測定した。
発泡体を幅:30mm×長さ:30mmに切り出し、シート状の試験片とした。次に該試験片を、圧縮速度:10mm/minで、厚さ方向に、圧縮率が50%になるまで圧縮したときの応力(N)を単位面積(1cm 2 )当たりに換算して反発力(N/cm 2 )とした。
デジタルマイクロスコープ(商品名「VHX−500」、キーエンス株式会社製)により、発泡体気泡部の拡大画像を取り込み、同計測機器の解析ソフトを用いて、画像解析することにより、平均セル径(μm)を求めた。なお、取り込んだ拡大画像の気泡数は100個程度である。なお、セル径は、セルの面積を求め、円相当径換算したものである。
圧縮永久歪は、湿度:50%、所定の温度の条件下で、24時間、50%圧縮状態を維持してから圧縮状態を解放することにより求めた。
室温(23±2℃)の温度条件で求めた圧縮永久歪を表1の「室温での圧縮永久歪」の欄に示し、50℃の温度条件で求めた圧縮永久歪を表1の「50℃での圧縮永久歪」の欄に示し、80℃の温度条件で求めた圧縮永久歪を表1の「80℃での圧縮永久歪」の欄に示した。
次に、この試験片を治具により、2枚の圧縮板(アルミ板)で、試験片の両面から厚さ方向に、初期の厚さに対して50%の厚さとなるように圧縮し、この圧縮状態を維持して、湿度50%、所定の温度(室温、50℃、80℃)の条件下で、24時間保管した。この圧縮した状態での試験片の厚さを厚さbとした。
24時間経過後、試験片の圧縮状態を解き、24時間放置した。放置後、試験片の厚さを正確に測定し、厚さcとした。
厚さa、厚さb、厚さcから、下記式より、それぞれの温度での圧縮永久歪(%)を算出した。
なお、厚さa、厚さb、厚さcは、いずれも、温度が23±2℃、相対湿度が50±5%の環境下で測定した。
圧縮永久歪(%)={(a−c)/(a−b)}×100
溶融張力の測定には、ROSAND社製のCapilary Extrusion Rheometerを使用し、引取速度3.0m/minの時の張力を溶融張力とした。なお、測定には、発泡成形前のペレットを用いた。また、測定時の温度は、220℃であった。
測定には、発泡成形前のペレットを用いた。該ペレットを、加熱した熱板プレスを用いて、厚さ1mmのシート状に成形し、シートを得た。該シートからサンプル(縦:10mm、横:20mm、厚さ:1mm)を切り出した。
上記サンプルより、一軸伸長粘度計(ティー・エイ・インスツルメント社製)を用いて、温度:218℃、歪速度0.1[1/s]での一軸伸長粘度を測定した。
そして、下記式より、歪硬化度を求めた。
歪硬化度 = logηmax/logη0.2
(ηmaxは一軸伸長粘度測定において最も高くなったときの伸長粘度を示し、η0.2は歪εが0.2の時の伸長粘度を示す。)
Claims (12)
- 融点が180〜240℃であるポリエステル系エラストマーと、エポキシ変性ポリマーとを含むポリエステル系エラストマー組成物を発泡させることにより形成されるポリエステル系エラストマー発泡体であって、前記エポキシ変性ポリマーの重量平均分子量は25,000を超え100,000以下であり、前記エポキシ変性ポリマーのエポキシ当量は800〜3000g/eqであり、前記エポキシ変性ポリマーの含有量は前記ポリエステル系エラストマー100重量部に対して1.5〜4.0重量部であり、見掛け密度が0.03〜0.15g/cm 3 であり、シート形状をとり、80℃での圧縮永久歪(50%圧縮状態を24時間維持)が60%以下である、ポリエステル系エラストマー発泡体。
- 前記エポキシ変性ポリマーが、エポキシ変性アクリル系ポリマー及びエポキシ変性ポリエチレンから選ばれる少なくとも1のポリマーである請求項1記載のポリエステル系エラストマー発泡体。
- 平均セル径が10〜200μmのセル構造を有する請求項1又は2記載のポリエステル系エラストマー発泡体。
- 50%圧縮時の反発力が0.1〜4.0N/cm2である、請求項1〜3の何れか1項に記載のポリエステル系エラストマー発泡体。
- 請求項1〜4の何れか1項に記載のポリエステル系エラストマー発泡体を含むことを特徴とする発泡部材。
- 前記ポリエステル系エラストマー発泡体上に粘着剤層を有する請求項5記載の発泡部材。
- 前記粘着剤層がアクリル系粘着剤層である請求項6記載の発泡部材。
- 見掛け密度が0.03〜0.15g/cm 3 であり、シート形状をとり、且つ80℃での圧縮永久歪(50%圧縮状態を24時間維持)が60%以下であるポリエステル系エラストマー発泡体を製造するための方法であって、融点が180℃〜240℃であるポリエステル系エラストマーと、重量平均分子量が25,000を超え100,000以下であってエポキシ当量が800〜3000g/eqであるエポキシ変性ポリマーとを含み、当該エポキシ変性ポリマーの含有量が前記ポリエステル系エラストマー100重量部に対して1.5〜4.0重量部であるポリエステル系エラストマー組成物を発泡させることを経ることを特徴とする、ポリエステル系エラストマー発泡体の製造方法。
- 前記ポリエステル系エラストマー組成物に高圧のガスを含浸させた後、減圧する工程を経て前記発泡を行う、請求項8記載のポリエステル系エラストマー発泡体の製造方法。
- 前記ガスは不活性ガスである、請求項9記載のポリエステル系エラストマー発泡体の製造方法。
- 前記ガスは二酸化炭素ガスである、請求項10記載のポリエステル系エラストマー発泡体の製造方法。
- 前記ガスは、超臨界状態にあるガスである、請求項9〜11の何れか1項に記載のポリエステル系エラストマー発泡体の製造方法。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012107289A JP6058281B2 (ja) | 2011-07-05 | 2012-05-09 | ポリエステル系エラストマー発泡体及び発泡部材 |
US13/541,303 US9156959B2 (en) | 2011-07-05 | 2012-07-03 | Polyester elastomer foam and foam material |
KR1020120072726A KR101921758B1 (ko) | 2011-07-05 | 2012-07-04 | 폴리에스터계 엘라스토머 발포체 및 발포 부재 |
TW101124307A TW201305259A (zh) | 2011-07-05 | 2012-07-05 | 聚酯系彈性體發泡體及發泡構件 |
CN201210232762.5A CN102863748B (zh) | 2011-07-05 | 2012-07-05 | 聚酯系弹性体发泡体及发泡部件 |
EP20120175030 EP2543698B1 (en) | 2011-07-05 | 2012-07-05 | Polyester elastomer foam and foam material |
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EP (1) | EP2543698B1 (ja) |
JP (1) | JP6058281B2 (ja) |
KR (1) | KR101921758B1 (ja) |
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-
2012
- 2012-05-09 JP JP2012107289A patent/JP6058281B2/ja active Active
- 2012-07-03 US US13/541,303 patent/US9156959B2/en active Active
- 2012-07-04 KR KR1020120072726A patent/KR101921758B1/ko active IP Right Grant
- 2012-07-05 EP EP20120175030 patent/EP2543698B1/en not_active Not-in-force
- 2012-07-05 CN CN201210232762.5A patent/CN102863748B/zh active Active
- 2012-07-05 TW TW101124307A patent/TW201305259A/zh unknown
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TW201305259A (zh) | 2013-02-01 |
CN102863748A (zh) | 2013-01-09 |
KR20130005240A (ko) | 2013-01-15 |
US20130011657A1 (en) | 2013-01-10 |
EP2543698B1 (en) | 2014-10-08 |
US9156959B2 (en) | 2015-10-13 |
EP2543698A1 (en) | 2013-01-09 |
CN102863748B (zh) | 2016-09-14 |
JP2013032492A (ja) | 2013-02-14 |
KR101921758B1 (ko) | 2018-11-23 |
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