JP2016180055A - シリル化剤薬液の調製方法及び表面処理方法 - Google Patents
シリル化剤薬液の調製方法及び表面処理方法 Download PDFInfo
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- JP2016180055A JP2016180055A JP2015060985A JP2015060985A JP2016180055A JP 2016180055 A JP2016180055 A JP 2016180055A JP 2015060985 A JP2015060985 A JP 2015060985A JP 2015060985 A JP2015060985 A JP 2015060985A JP 2016180055 A JP2016180055 A JP 2016180055A
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- silylating agent
- agent chemical
- preparing
- ion exchange
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- 239000000126 substance Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 57
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- 239000007788 liquid Substances 0.000 title abstract description 24
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 238000002444 silanisation Methods 0.000 title abstract 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 128
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- 239000003456 ion exchange resin Substances 0.000 claims abstract description 55
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- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 5
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
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- 230000000052 comparative effect Effects 0.000 description 3
- 238000005342 ion exchange Methods 0.000 description 3
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- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 description 3
- 125000003136 n-heptyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 3
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Abstract
【解決手段】予め有機溶剤に接触させたイオン交換樹脂膜を用いて処理前シリル化剤薬液中の金属不純物を低減する工程を含む、シリル化剤薬液の調製方法。前記金属不純物は、Fe、Cu、Al及びZnより選択される少なくとも1つを含み、前記有機溶剤がアルキレングリコールアルキルエーテルアセテートであり、具体的には、プロピレングリコールモノメチルエーテルアセテート(PEGMEA)である、シリル化剤薬液の調製方法。基板表面に、上記シリル化剤薬液を暴露させ、基板表面を疎水化する表面処理方法。
【選択図】なし
Description
本発明のシリル化剤薬液の調製方法は、予め有機溶剤に接触させたイオン交換樹脂膜を用いて処理前シリル化剤薬液中の金属不純物を低減する工程(以下、「金属不純物低減工程」ということがある。)を含む。金属不純物低減工程は、具体的には、予め有機溶剤に接触させたイオン交換樹脂膜に処理前シリル化剤薬液を透過させることを含み、より具体的には、(1)予めイオン交換樹脂膜を有機溶剤に接触させる工程及び(2)イオン交換樹脂膜に処理前シリル化剤薬液を透過させる工程を含む。
本発明において用いるイオン交換樹脂膜としては、特に限定されないが、適当なイオン交換基が樹脂膜に固定された、イオン交換樹脂を含むフィルターを用いることができ、例えば、高密度ポリエチレン膜にスルホン酸基等のカチオン交換基を化学的に修飾した強酸性陽イオン交換樹脂等のイオン交換樹脂膜等のほか、多孔質の高密度ポリエチレンメディアの細孔表面に強酸性陽イオン交換樹脂を化学的に導入し、除粒子膜とイオン交換樹脂膜が一体構造となった除粒子膜付イオン交換樹脂膜等が挙げられ、ポリアルキレン膜にイオン交換基が化学的に修飾されているものが好ましい。ポリアルキレンとしては、例えば、ポリエチレン、ポリプロピレン等が挙げられ、ポリプロピレンが好ましい。イオン交換基としては、カチオン交換基が好ましい。本発明において用いるイオン交換樹脂膜としては、金属イオン除去用フィルターとして市販されているものを用いることができる。
本発明において、イオン交換樹脂膜に予め接触させる有機溶剤としては、シリル化剤と反応する官能基を持たない有機溶剤が好ましい。有機溶剤は、1種を単独で用いてもよく、2種以上を混合して用いてもよい。
本発明における金属不純物低減工程において、具体的には、処理前シリル化剤薬液を透過させることに先立ち、予めイオン交換樹脂膜を有機溶剤に接触させる。
イオン交換樹脂膜を有機溶剤に接触させる方法としては特に限定されず、例えば、イオン交換樹脂膜に有機溶剤を透過させる方法、有機溶剤にイオン交換樹脂膜を浸漬する方法等が挙げられ、有機溶剤にイオン交換樹脂膜を浸漬しつつ該有機溶剤を少量ずつイオン交換樹脂膜に透過させる方法が好ましく、具体的には、イオン交換樹脂膜を設置したろ過装置に有機溶剤を通液させることにより行うことができ、その際にイオン交換樹脂膜が有機溶剤に浸漬する程度の量の有機溶剤をイオン交換樹脂膜上に投入することにより、有機溶剤にイオン交換樹脂膜を浸漬しつつ該有機溶剤を少量ずつイオン交換樹脂膜に透過させることができる。
シリル化剤は一般的に水分と反応して重合しやすいため、予め反応工程中の水分を低減しておくことが好ましい。そのためにイオン交換樹脂膜を有機溶剤に接触させる前に窒素パージを行い、窒素パージを行ったグローブボックス等の閉鎖環境下においてイオン交換樹脂膜に有機溶剤を接触させることも好ましい。
本発明において、上記のように予めイオン交換樹脂膜を有機溶剤に接触させた後、かかるイオン交換樹脂膜に処理前シリル化剤薬液を透過させるが、該透過の方法としては特に限定されず、例えば、該イオン交換樹脂膜を設置したろ過装置に処理前シリル化剤薬液を通液することにより行うことができ、製造効率の観点で、予めイオン交換樹脂膜を有機溶剤に接触させる工程を上述のようにろ過装置を用いて行った後、引き続き同じろ過装置を用いて行ってもよい。
本発明において用いる処理前シリル化剤薬液は、上述のように、少なくともシリル化剤及び金属不純物を含有する液体である。本明細書において、「処理前シリル化剤薬液」は、本発明における金属不純物低減工程において、上述のイオン交換樹脂膜に透過した後の、イオン交換樹脂膜から流出する処理後のシリル化剤薬液(本明細書において、「処理済シリル化剤薬液」ということがある。)と区別するために用いる用語である。当然のことながら、処理前シリル化剤薬液と処理済シリル化剤薬液とにおいて含有されるシリル化剤は同じあってよい。
シリル化剤の種類は、基板表面の性質を疎水化することができるものであれば、特に限定されず、従来から、種々の材料の撥水化ないし疎水化に使用されているシリル化剤から適宜選択して使用される。本明細書において、「疎水化」とは、撥水化を含む概念である。以下、本発明において用いることができるシリル化剤について説明する。
(R1)aSi(H)bX1 4−a−b (1)
(式中、R1は、それぞれ互いに独立して、一部又は全ての水素原子がフッ素原子に置換されていてもよい炭素数1〜18の1価の炭化水素基を含む1価の有機基を表し、X1は、それぞれ互いに独立して、ケイ素原子と結合する原子が窒素である1価の官能基を表し、aは1〜3の整数、bは0〜2の整数であり、aとbの合計は1〜3である。)
R19 qSi[N(CH3)2]4−q・・・(9)
R20 r[N(CH3)2]3−rSi−R22−SiR21 s[N(CH3)2]3−s・・・(10)
シリル化剤としては、環状シラザン化合物も好ましい。以下、環状シラザン化合物について説明する。
本発明において用いる処理前シリル化剤薬液に含有される金属不純物としては、特に限定されず、例えば、周期律表の第4族、第5族、第6族、第7族、第8族、第9族及び第10族からなる群より選択される少なくとも1つの金属元素を含むもの等が挙げられ、その中でも、Fe、Cu、Al、Zn、Co、Li、Na、K、Ca、Cr、Mn、Pb、Ni、Ru、Rh、Pd、Re、Os、Ir、Pt、W及びMoからなる群より選択される少なくとも1つの金属元素を含むものであり、その中でも特に、本発明のシリル化剤薬液の調製方法により処理前シリル化剤薬液から除去されやすい観点で、Fe、Cu、Al及びZnよりなる群から選択される少なくとも1つの金属元素を含む。これらは、金属元素からなる単体であってもよい。本明細書において、「金属元素を含むもの」とは、該金属元素からなる単体であってもよいし、該金属元素を有する金属化合物であってもよい。このことは、「金属元素」が例えば「Al元素」等の具体的な金属元素である場合についても同様である。
本発明において用いる処理前シリル化剤薬液は、本発明の目的を阻害しない範囲で、上述したシリル化剤及び金属不純物以外のその他の成分を含有するものであってもよい。
その他の成分としては特に限定されないが、例えば、有機溶剤等が挙げられ、シリル化剤が液体でない場合は有機溶剤を含有することが好ましいが、基板表面にシリル化剤を暴露することができるのであれば有機溶剤を含有しないものであってもよい。有機溶剤を含有する場合、当然のことながら、処理前シリル化剤薬液と処理済シリル化剤薬液とにおいて含有される有機溶剤は同じあってよい。
本発明において、上述の金属不純物低減工程により得られるシリル化剤薬液(処理済シリル化剤薬液)は、処理前シリル化剤薬液に含有されていた金属不純物の濃度が低減されたものである。
本発明の第一の態様であるシリル化剤薬液の調製方法により得られるシリル化剤薬液を基板表面に暴露させ、該基板表面を疎水化する表面処理方法もまた、本発明の一つである。この表面処理方法において、シリル化剤薬液は、上述の基板表面処理液として用いることができる。
上記の方法の中では、基板表面を均一に処理しやすいことから、シリル化剤を含む基板表面処理液を基板表面に接触させる方法が好ましい。
本発明の表面処理方法により、基板表面を疎水化することができるので、例えば、表面に微細なパターンが形成された基板について、その表面を疎水化することによりパターン倒れを抑制することができる。
シリル化剤としてトリメチルシリルジメチルアミン(TMSDMA)を用い、該TMSDMA100%の液体を処理前シリル化剤薬液として用いた。イオン交換樹脂膜(DFA1SRPESW44;ポール(PALL)社製)をろ過装置に設置し、窒素パージを行ったグローブボックス中(窒素中)においてプロピレングリコールモノメチルエーテルアセテート(PEGMEA)で浸漬した。その後、処理前シリル化剤薬液を約200ml/分の流速で前記イオン交換樹脂膜を透過し、1000ml濾過する毎に、100mlサンプリングすることを3回繰り返した。処理前シリル化剤薬液及び3回のサンプリング液に含有される金属不純物の量をICP−MSにより測定し、3回の測定の平均値を得た。この測定を2回行った。
イオン交換樹脂膜を予めPEGMEAに接触させないこと以外は実施例1と同様にして金属不純物の量を測定した。
実施例、比較例と同様に、処理前シリル化剤の金属不純物量を測定し、金属不純物低減工程により得られる処理済シリル化剤薬液に含有される金属不純物の量Bを、処理前シリル化剤薬液に含有されていた金属不純物の量Aで除した値B/Aの百分率で表される金属不純物残存率を測定した。その結果を表1に示す。
また、処理前シリル化剤薬液の使用量を約4倍にした実施例2においても、実施例1とほぼ同程度に金属不純物の濃度が低減されることがわかった。
Claims (9)
- 予め有機溶剤に接触させたイオン交換樹脂膜を用いて処理前シリル化剤薬液中の金属不純物を低減する工程を含む、シリル化剤薬液の調製方法。
- 前記金属不純物は、Fe、Cu、Al及びZnよりなる群から選択される少なくとも1つを含む、請求項1記載のシリル化剤薬液の調製方法。
- 前記イオン交換樹脂膜は、前記有機溶剤に接触させる前に窒素パージを行う、請求項1又は2記載のシリル化剤薬液の調製方法。
- 前記有機溶剤がアルキレングリコールアルキルエーテルアセテートである、請求項1〜3の何れか1項記載のシリル化剤薬液の調製方法。
- 前記アルキレングリコールアルキルエーテルアセテートは、プロピレングリコールモノメチルエーテルアセテート(PEGMEA)である、請求項4記載のシリル化剤薬液の調製方法。
- 前記シリル化剤薬液に含まれるシリル化剤は、下記一般式(1)で表されるケイ素化合物である、請求項1〜5の何れか1項記載のシリル化剤薬液の調製方法。
(R1)aSi(H)bX1 4−a−b (1)
(式中、R1は、それぞれ互いに独立して、一部又は全ての水素原子がフッ素原子に置換されていてもよい炭素数1〜18の1価の炭化水素基を含む1価の有機基を表し、X1は、それぞれ互いに独立して、ケイ素原子と結合する原子が窒素である1価の官能基を表し、aは1〜3の整数、bは0〜2の整数であり、aとbの合計は1〜3である。) - 前記処理前シリル化剤薬液は、シリル化剤及び金属不純物のみからなる、請求項1〜6の何れか1項記載のシリル化剤薬液の調製方法。
- 前記シリル化剤薬液は、基板表面処理液である、請求項1〜7の何れか1項記載のシリル化剤薬液の調製方法。
- 基板表面に、請求項1〜8の何れか1項記載のシリル化剤薬液の調製方法により得られるシリル化剤薬液を暴露させ、前記基板表面を疎水化する表面処理方法。
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JP7543741B2 (ja) | 2020-07-10 | 2024-09-03 | 日産化学株式会社 | リソグラフィー用塗布膜形成組成物の製造方法 |
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