JP7104174B2 - 研磨層用ポリウレタン、研磨層、研磨パッド及び研磨層の改質方法 - Google Patents
研磨層用ポリウレタン、研磨層、研磨パッド及び研磨層の改質方法 Download PDFInfo
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Description
数平均分子量850のポリテトラメチレングリコール(PTMG850)、酒石酸ジエチル(DET)、1,4-ブタンジオール(1,4-BD)、および4,4’-ジフェニルメタンジイソシアネート(MDI)を、質量比で、PTMG850:DET:1,4-BD:MDI=17.9:8.70:15.2:58.1となる割合で混合した原料配合物を調整した。このとき、DET/1,4-BD=20/80(モル比)であった。そして、同軸で回転する2軸押出機に原料配合物を定量ポンプで連続的に供給し、連続溶融重合を行い、2軸押出機のダイスから溶融物を水中に連続的に押出して冷却することによりストランドを形成させ、ストランドをペレタイザーでペレット状に細断し、80℃で20時間除湿乾燥することにより、カルボン酸エステル基を側鎖に有する熱可塑性ポリウレタン(PU1)のペレットを製造した。
5~14gのPU1のペレットをテフロン(登録商標)のシートに挟み、熱プレス機を用いて200~230℃で熱プレスして成形した。このようにして厚さ0.3~0.5mmのPU1の非発泡成形体を得た。そして、PU1の非発泡成形体のカルボン酸エステル基を加水分解させるための改質処理をすることにより、カルボン酸エステル基をカルボン酸基に変換させた。改質処理の条件は、(i)50℃の水酸化カリウム(KOH)水溶液(0.1M)に24時間浸漬、(ii)50℃の塩酸(HCl)水溶液(0.1M)に24時間浸漬、(iii)50℃の純水に24時間浸漬、の3条件でそれぞれ行った。このようにして、表面にカルボン酸基を有する熱可塑性ポリウレタンの非発泡成形体を得た。
そして、改質処理前後の熱可塑性ポリウレタンの非発泡成形体をそれぞれ30mm×60mmに切り出し、それらの表面を洗浄して試験片を作成した。そして、各試験片のpH3.0、pH4.0、及びpH7.0におけるゼータ電位を電気泳動光散乱装置(ELS-Z、大塚電子(株)製)を用いて測定した。具体的には、電気泳動光散乱装置の平板測定用セルにサンプルを取り付け、塩酸水溶液でpH3.0、及びpH4.0に調整された10mM 塩化ナトリウム水溶液に分散させたモニターラテックス(大塚電子(株)製)を用いて測定した。同様に、水酸化ナトリウム水溶液でpH7.0に調整した10mM 塩化ナトリウム水溶液に分散させたモニターラテックスを用いて測定した。
熱プレス機を用いて厚さ300μmのPU1のフィルムを作製した。そして、上述した改質処理と同様の条件で、PU1のフィルムを改質処理した。そして、改質処理前後のフィルムをそれぞれ、20℃、65%RHの条件下に3日間放置した。そして改質処理前後の各フィルムの水に対する接触角を、協和界面科学(株)製DropMaster500を用いて測定した。
原料配合物を、PTMG850:DET:1,4-BD:MDI=12.1:18.0:11.8:58.1となる割合で配合した原料配合物に変更した以外は実施例1と同様にして、カルボン酸エステル基を側鎖に有する熱可塑性ポリウレタン(PU2)のペレットを製造した。このとき、DET/1,4-BD=40/60(モル比)であった。そして、PU1のペレットの代わりにPU2のペレットを用いた以外は実施例1と同様にして、熱可塑性ポリウレタンの特性を評価した。結果を表1に示す。
原料配合物を、PTMG850:DET:1,4-BD:MDI=13.4:9.4:16.4:60.8となる割合で配合した原料配合物に変更した以外は実施例1と同様にして、カルボン酸エステル基を側鎖に有する熱可塑性ポリウレタン(PU3)のペレットを製造した。このとき、DET/1,4-BD=20/80(モル比)であった。そして、PU1のペレットの代わりにPU3のペレットを用いた以外は実施例1と同様にして、熱可塑性ポリウレタンの特性を評価した。結果を表1に示す。
PTMG850、1-(tert-ブトキシカルボニル)-3-ピロリジノール(BCP)、1,4-BD、及びMDIを、PTMG850:BCP:1,4-BD:MDI=19.0:7.90:15.1:58.1、となる割合で配合した原料配合物に変更した以外は実施例1と同様にして、カルボン酸エステル基を末端に有する熱可塑性ポリウレタン(PU4)のペレットを製造した。このとき、BCP/1,4-BD=20/80(モル比)であった。そして、PU1のペレットの代わりにPU4のペレットを用いた以外は実施例1と同様にして、熱可塑性ポリウレタンの特性を評価した。結果を表1に示す。
PTMG850、2,4-ジヒドロキシ安息香酸メチル(MDB)、1,4-BD、及びMDIを、PTMG850:MDB:1,4-BD:MDI=19.7:7.0:15.1:58.1、となる割合で配合した原料配合物に変更した以外は実施例1と同様にして、カルボン酸エステル基を側鎖に有する熱可塑性ポリウレタン(PU5)のペレットを製造した。このとき、MDB/1,4-BD=20/80(モル比)であった。そして、PU1のペレットの代わりにPU5のペレットを用いた以外は実施例1と同様にして、熱可塑性ポリウレタンの特性を評価した。結果を表1に示す。
PTMG850:1,4-BD:MDI=23.5:18.4:58.1となる割合で配合した原料配合物に変更した以外は実施例1と同様にして、熱可塑性ポリウレタン(PU6)のペレットを製造した。なお、PU6は、カルボン酸エステル基を側鎖に有しない。そして、PU1のペレットの代わりにPU6のペレットを用いた以外は実施例1と同様にして、熱可塑性ポリウレタンの特性を評価した。結果を表1に示す。
Claims (12)
- カルボン酸エステル基を、側鎖又は主鎖末端の少なくとも一方に有する研磨層用ポリウレタン。
- 単量体単位として、(a)鎖伸長剤単位、(b)高分子ポリオール単位、及び(c)有機ジイソシアネート単位を少なくとも含み、前記(a)鎖伸長剤単位及び前記(b)高分子ポリオール単位の少なくとも一方が前記カルボン酸エステル基を有する請求項1に記載の研磨層用ポリウレタン。
- 前記(a)鎖伸長剤単位が、酒石酸ジエステル,1-(tert-ブトキシカルボニル)-3-ピロリジノール,及び2,4-ジヒドロキシ安息香酸メチルからなる群から選ばれる少なくとも1種の化合物に由来する単量体単位を含む請求項2に記載の研磨層用ポリウレタン。
- 熱可塑性ポリウレタンである請求項1~3の何れか1項に記載の研磨層用ポリウレタン。
- 研磨面の、研磨される基材に接触する領域全体に、請求項1~4の何れか1項に記載の研磨層用ポリウレタンが、その機能を充分に発揮するための量、含まれる研磨層。
- 前記研磨面の、研磨される基材に接触する領域全体における、前記研磨層用ポリウレタンの含有割合が50質量%以上である請求項5に記載の研磨層。
- 前記研磨層用ポリウレタンの非発泡成形体である請求項5または6に記載の研磨層。
- 研磨面の、研磨される基材に接触する領域全体に、カルボン酸エステル基を、側鎖又は主鎖末端の少なくとも一方に有するポリウレタンが、その機能を充分に発揮するための量、含まれる、研磨層を準備する工程と、
前記ポリウレタンの前記カルボン酸エステル基を加水分解させてカルボン酸基を生成させる工程と、を備えることを特徴とする研磨層の改質方法。 - 前記研磨面の、研磨される基材に接触する領域全体における、前記ポリウレタンの含有割合が50質量%以上である請求項8に記載の研磨層の改質方法。
- カルボン酸基を有する熱可塑性ポリウレタンの成形体を含む研磨層であって、
研磨面の、研磨される基材に接触する領域全体の、pH3.0~pH8.0におけるゼータ電位が-1.0mV以下であることを特徴とする研磨層。 - 研磨面の、研磨される基材に接触する領域全体の、水との接触角が80度以下である請求項10に記載の研磨層。
- 請求項5~7,10及び11の何れか1項に記載の研磨層を含む研磨パッド。
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