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JPH1135573A - 新規ビススルホニルジアゾメタン - Google Patents

新規ビススルホニルジアゾメタン

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Publication number
JPH1135573A
JPH1135573A JP9198954A JP19895497A JPH1135573A JP H1135573 A JPH1135573 A JP H1135573A JP 9198954 A JP9198954 A JP 9198954A JP 19895497 A JP19895497 A JP 19895497A JP H1135573 A JPH1135573 A JP H1135573A
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Prior art keywords
compound
group
formula
bis
acid
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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.)
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JP9198954A
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English (en)
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JPH1135573A5 (ja
JP3980124B2 (ja
Inventor
Kazufumi Sato
和史 佐藤
Kazuyuki Nitta
和行 新田
Toshiji Shimamaki
利治 島巻
Shinya Kuramoto
伸哉 庫本
Norio Hayakawa
訓男 早川
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.)
Daito Kemitsukusu Kk
Tokyo Ohka Kogyo Co Ltd
Original Assignee
Daito Kemitsukusu Kk
Tokyo Ohka Kogyo Co Ltd
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Priority to JP19895497A priority Critical patent/JP3980124B2/ja
Priority to US09/119,640 priority patent/US5945517A/en
Publication of JPH1135573A publication Critical patent/JPH1135573A/ja
Publication of JPH1135573A5 publication Critical patent/JPH1135573A5/ja
Application granted granted Critical
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Abstract

(57)【要約】 【課題】 化学増幅型レジストの酸発生剤として用いた
場合、露光部と未露光部のコントラストに優れ、高残膜
率を示す新規なビススルホニルジアゾメタンを提供す
る。 【解決手段】 一般式 【化1】 (Rは水素原子、又は同一環内の2個のRでジメチルメ
チレン基を形成する基、nは0又は1)で表わされるビ
ススルホニルジアゾメタンとする。

Description

【発明の詳細な説明】
【0001】
【発明の属する技術分野】本発明は化学増幅型レジスト
の酸発生剤として好適な新規スルホニルジアゾメタン化
合物に関するものである。
【0002】
【従来の技術】近年、半導体素子や液晶素子などの製造
においては、化学増幅型レジスト組成物が使用されるよ
うになってきた。この化学増幅型レジスト組成物は、放
射線の照射により生成した酸の触媒作用を利用したレジ
ストであって、高い感度と解像性を有し、放射線の照射
により酸を発生する化合物すなわち酸発生剤の使用量が
少なくてよいという利点を有している。
【0003】この化学増幅型レジストにはポジ型とネガ
型の2つのタイプがあり、これらは、一般に、酸発生剤
と、発生する酸の作用によりアルカリ水溶液に対する溶
解性が変化する被膜形成成分とを基本成分としている。
【0004】前記ポジ型レジストにおいては、被膜形成
成分として、通常tert‐ブトキシカルボニル基、テ
トラヒドロピラニル基などの溶解抑制基で水酸基の一部
を保護したポリヒドロキシスチレンなどが用いられてお
り、一方、ネガ型レジストにおいては、被膜形成成分と
して、通常上記溶解抑制基で水酸基の一部を保護したポ
リヒドロキシスチレン、あるいはポリヒドロキシスチレ
ンやノボラック樹脂などの樹脂成分に、メラミン樹脂や
尿素樹脂などの酸架橋性物質を組み合わせたものが用い
られている。
【0005】ところで、このような酸発生剤として、あ
る種のジアゾメタン化合物が用いられているが(特開平
3−103854号公報、特開平4−210960号公
報、特開平4−217249号公報)、これらを用いた
レジスト組成物は、露光部と未露光部のコントラストに
劣るため、残膜率が低くなるという欠点がある。
【0006】
【発明が解決しようとする課題】本発明は、従来のジア
ゾメタン化合物がもつ欠点を克服し、化学増幅型レジス
トの酸発生剤として用いた場合、露光部と未露光部のコ
ントラストに優れ、高残膜率を示す新規なビススルホニ
ルジアゾメタンを提供することを目的としてなされたも
のである。
【0007】
【課題を解決するための手段】本発明者らは、化学増幅
型レジストの酸発生剤として用いたときに、露光部と未
露光部のコントラストに優れ、高残膜率を示す新規なビ
ススルホニルジアゾメタン化合物を開発するために鋭意
研究を重ねた結果、2個のテトラヒドロピラニルオキシ
基置換脂環式基をもつ化合物が、その目的を達成しうる
ことを見出し、この知見に基づいて本発明をなすに至っ
た。
【0008】すなわち、本発明は、一般式
【化2】 (式中のRはそれぞれ水素原子であるか、又は同一環内
の2個のRでジメチルメチレン基を形成する基であり、
nは0又は1である)で表わされるビススルホニルジア
ゾメタンを提供するものである。
【0009】この一般式(I)中の脂環式基は、2個の
Rが水素原子の場合はシクロヘキシル基であり、2個の
Rが一緒になってジメチルメチレン基を形成している場
合は、7,7‐ジメチルビシクロ[2.2.1]ヘプチ
ル基である。この脂環式基に結合しているテトラヒドロ
ピラニルオキシ基は、2‐位置、3‐位置、4‐位置の
いずれの位置に結合していてもよい。
【0010】
【発明の実施の形態】本発明の化合物の中で前記一般式
(I)中のRが水素原子であるもの、すなわち脂環式基
がシクロヘキシル基である場合は、例えば次に示す反応
式に従い、ビス(ヒドロキシシクロヘキシル)スルホニ
ルジアゾメタン又はビス(ヒドロキシシクロヘキシルメ
チル)スルホニルジアゾメタン(II)に、3,4‐ジ
ヒドロ‐2H‐ピラン(III)を反応させることによ
り製造することができる。
【0011】
【化3】 (式中のnは前記と同じ意味をもつ)
【0012】この反応は、不活性溶媒例えばテトラヒド
ロフラン、ジオキサンのような環状エーテル中、p‐ト
ルエンスルホン酸ピリジニウムの存在下で行われる。ま
た、前記一般式(I)の同一環中の2個のRがジメチル
メチレン基を形成しているもの、すなわち7,7‐ジメ
チルビシクロ[2.2.1]ヘプチル基である場合は、
次の反応式に従い、対応するヒドロキシ置換脂環式メル
カプタン(IV)とメチレンハライド(V)とを縮合さ
せて対応するビス(ヒドロキシ置換脂環式チオ)メタン
(VI)を形成させ、これを酸化して対応するビススル
ホニルメタン(VII)に変換したのち、ジアゾ化し
て、ビス(ヒドロキシ置換脂環式スルホニル)ジアゾメ
タン(VIII)を製造し、これに3,4‐ジヒドロ‐
2H‐ピラン(III)を反応させることによって得る
ことができる。
【0013】
【化4】 (ただし、Xはハロゲン原子、nは前記と同じ意味をも
つ)
【0014】この反応において用いるメチレンハライド
(V)の例としては、メチレンクロリド、メチレンブロ
ミド、メチレンヨージドを挙げることができる。前記反
応式においてヒドロキシ置換脂環式メルカプタン(I
V)とメチレンハライドとの縮合は、不活性溶媒例えば
エタノール中において、水酸化カリウムのような塩基の
存在下で行われる。
【0015】次に、このようにして得たビス(ヒドロキ
シ置換脂環式チオ)メタン(VI)を酸化して対応する
ビススルホニルメタン(VII)に変換する反応は、例
えばエタノールのような不活性溶媒中、タングステン酸
アルカリを触媒として過酸化水素によって行うことがで
きる。
【0016】さらに、このようにして変換したビススル
ホニルメタン(VII)のジアゾ化は、例えば、エタノ
ールのような不活性溶媒中、水酸化カリウムや水酸化ナ
トリウムのような塩基の存在下でトシルアジドを反応さ
せることによって行われる。そして、最後のビス(ヒド
ロキシ置換脂環式スルホニル)ジアゾメタン(VII
I)と3,4‐ジヒドロ‐2H‐ピラン(III)との
反応は、シクロヘキシル基の場合と同様に、p‐トルエ
ンスルホン酸ピリジニウムの存在下で行われる。このよ
うにして得た生成物は、常法に従い再結晶などの手段に
より精製することができる。
【0017】このようにして得られる前記一般式(I)
のスルホニルジアゾメタン化合物は、文献未載の新規化
合物であって、光の照射により酸を発生すると同時に、
テトラヒドロピラニルオキシ基が発生した酸により解離
する性質を有している。
【0018】
【実施例】次に実施例により本発明をさらに詳細に説明
する。
【0019】実施例1 ビス(2‐ヒドロキシシクロヘキシルスルホニル)ジア
ゾメタン5g(0.014モル)と3,4‐ジヒドロ‐
2H‐ピラン3.5g(0.042モル)をジオキサン
50gに溶かし、p‐トルエンスルホン酸ピリジニウム
0.1gを加え、室温で40時間かきまぜた。次いで、
水50gを加え、酢酸エチル30gで抽出後、溶媒を留
去し、さらにシリカゲルカラムクロマトグラフィにより
分解、精製することにより、式
【化5】 で表わされるビス[2‐(2‐テトラヒドロピラニル)
オキシシクロヘキシルスルホニル]ジアゾメタン2.0
gを得た。このものの赤外吸収スペクトル及びプロトン
核磁気共鳴スペクトルを図1及び図2に示す。
【0020】実施例2 水酸化カリウム30g(0.53モル)をエタノール3
00gに溶かし、これにメルカプトイソボルネオール6
0g(0.32モル)を加えた。次いで、メチレンブロ
ミド28g(0.16モル)を室温にて30分にわたっ
て滴下した。この反応混合物をさらに50℃で3時間か
き混ぜたのち、析出した臭化カリウムをろ別し、次い
で、希塩酸で中和し、さらにメチレンクロリド500g
で抽出、溶媒を留去し、ビス〔2‐ヒドロキシ‐7,7
‐ジメチルビシクロ[2.2.1]ヘプタニルメチルチ
オ〕メタン67gを黄色油状物として得た。次いで、こ
のビス〔2‐ヒドロキシ‐7,7‐ジメチルビシクロ
[2.2.1]ヘプタニルメチルチオ〕メタン67g
(0.17モル)をエタノール300gに溶かし、タン
グステン酸ナトリウム0.6gを加えた。これに、35
%過酸化水素水200g(2.06モル)を45℃にお
いて30分にわたって滴下した。この反応混合物をさら
に50℃で20時間かきまぜた。次いで、水1000g
を加え、析出したビス〔2‐ヒドロキシ‐7,7‐ジメ
チルビシクロ[2.2.1]ヘプタニルメチルスルホニ
ル〕メタン51gを白色結晶として得た。次に、このビ
ス〔2‐ヒドロキシ‐7,7‐ジメチルビシクロ[2.
2.1]ヘプタニルメチルスルホニル〕メタン20g
(0.045モル)とトシルアジド10g(0.051
モル)をエタノール80gに溶かし、これに10%水酸
化カリウム水溶液300g(0.53モル)を室温で3
0分にわたって滴下した。この反応混合物をさらに室温
で2時間かきまぜた。次いで、析出した結晶をろ取し、
ビス〔2‐ヒドロキシ‐7,7‐ジメチルビシクロ
[2.2.1]ヘプタニルメチルスルホニル〕ジアゾメ
タン6.5gを得た。
【0021】このようにして得たビス〔2‐ヒドロキシ
‐7,7‐ジメチルビシクロ[2.2.1]ヘプタニル
メチルスルホニル〕ジアゾメタン5.0g(0.011
モル)と3,4‐ジヒドロ‐2H‐ピラン2.9g
(0.033モル)をジオキサン50gに溶かし、p‐
トルエンスルホン酸ピリジニウム0.1gを加え、室温
で40時間かきまぜた。次いで水50gを加え、酢酸エ
チル30gで抽出後、溶媒を留去し、さらにシリカゲル
カラムクロマトグラフィにより分離精製することによ
り、式
【化6】 で表わされるビス〔2‐[2‐テトラヒドロピラニル]
オキシ‐7,7‐ジメチルビシクロ[2.2.1]ヘプ
タニルメチルスルホニル〕ジアゾメタン1.5gを得
た。
【0022】参考例 水酸基の水素原子の39モル%がtert‐ブチルオキ
シカルボニル基で置換された重量平均分子量10,00
0のポリヒドロキシスチレンと水酸基の水素原子の39
モル%がエトキシエチル基で置換された重量平均分子量
10,000のポリヒドロキシスチレンとを重量比3:
7の割合で含む樹脂混合物100重量部に、酸発生剤と
して実施例1で得たビス[2‐(2‐テトラヒドロピラ
ニル)オキシシクロヘキシルスルホニル]ジアゾメタン
7重量部又は実施例2で得たビス〔2‐[2‐テトラヒ
ドロピラニル]オキシ‐7,7‐ジメチルビシクロ
[2.2.1]ヘプタニルメチルスルホニル〕ジアゾメ
タン7重量部とトリエチルアミン0.3重量部とサリチ
ル酸0.2重量部を配合し、プロピレングリコールモノ
メチルエーテルアセテート490重量部に溶解し、この
溶液を孔径0.2μmのメンブランフィルターを通して
ろ過し、ポジ型レジスト組成物を調製した。次に、この
ポジ型レジスト組成物について以下に示す方法で物性を
求め、その結果を表1に示す。なお、比較のために、公
知の酸発生剤であるビス(シクロヘキシルスルホニル)
ジアゾメタン5重量部を用いたポジ型レジスト組成物に
ついての物性を求め、その結果を表1に併記した。
【0023】(1)感度:試料をスピンナーを用いてシ
リコンウエーハ上に塗布し、これをホットプレート上で
90℃、90秒間乾燥して膜厚0.7μmのレジスト膜
を得た。この膜に縮小投影露光装置NSR−2005E
X8A(ニコン社製)を用いて、1mJ/cm2ずつド
ーズ量を加え露光したのち、110℃、90秒間のPE
B(POST EXPOSURE BAKE)を行い、
2.38重量%テトラメチルアンモニウムヒドロキシド
水溶液で23℃にて60秒間現像し、30秒間水洗して
乾燥したとき、現像後の露光部の膜厚が0となる最小露
光時間を感度としてmJ/cm2(エネルギー量)単位
で測定した。
【0024】(2)解像性:上記(1)と同様な操作を
行い、0.25μmのマスクパターンを再現する露光量
における限界解像度で示した。
【0025】(3)レジストパターン形状:上記(1)
と同様な操作を行い、0.25μmの矩形のレジストパ
ターンが得られた場合を○、レジストパターントップが
やや細いパターンとなったり、波打ったレジストパター
ンとなった場合を×として評価した。
【0026】(4)引き置き経時安定性:上記(1)に
おいて、露光までの操作を行ったのち、60分間放置し
たあと、同様にPEB処理、現像を行い、0.25μm
のレジストパターンの断面形状をSEM(走査型電子顕
微鏡)写真により観察し、0.25μmのラインアンド
スペースが1:1に形成されたものを5、ライン幅(レ
ジストパターン幅)が0.25μmより広くなり、スペ
ース幅が0.25μmより狭くなったものを3、解像し
ないものを1とし、それぞれの中間を4,2として評価
した。
【0027】(5)残膜率:上記(1)と同様な操作を
行い、未露光部の残膜率を現像前膜厚に対する現像後膜
厚の割合として求めた。
【0028】
【表1】
【0029】
【発明の効果】本発明化合物は新規化合物であって、こ
れを化学増幅型レジストの酸発生剤として用いると、露
光部と未露光部のコントラストに優れるため、残膜率が
高くプロファイル形状の優れたパターンを与える。
【図面の簡単な説明】
【図1】 実施例1で得た化合物の赤外吸収スペクトル
図。
【図2】 実施例1で得た化合物のプロトン核磁気共鳴
スペクトル図。
───────────────────────────────────────────────────── フロントページの続き (72)発明者 島巻 利治 大阪府大阪市福島区福島7丁目15−26 ダ イトーケミックス株式会社内 (72)発明者 庫本 伸哉 大阪府大阪市福島区福島7丁目15−26 ダ イトーケミックス株式会社内 (72)発明者 早川 訓男 大阪府大阪市福島区福島7丁目15−26 ダ イトーケミックス株式会社内

Claims (3)

    【特許請求の範囲】
  1. 【請求項1】 一般式 【化1】 (式中のRはそれぞれ水素原子であるか、又は同一環内
    の2個のRでジメチルメチレン基を形成する基であり、
    nは0又は1である)で表わされるビススルホニルジア
    ゾメタン。
  2. 【請求項2】 一般式中のRが水素原子である請求項1
    記載のビススルホニルジアゾメタン。
  3. 【請求項3】 一般式中の同一環内にある2個のRがそ
    れぞれジメチルメチレン基を形成する基である請求項1
    記載のビススルホニルジアゾメタン。
JP19895497A 1996-07-24 1997-07-24 新規ビススルホニルジアゾメタン Expired - Fee Related JP3980124B2 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP19895497A JP3980124B2 (ja) 1997-07-24 1997-07-24 新規ビススルホニルジアゾメタン
US09/119,640 US5945517A (en) 1996-07-24 1998-07-21 Chemical-sensitization photoresist composition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19895497A JP3980124B2 (ja) 1997-07-24 1997-07-24 新規ビススルホニルジアゾメタン

Publications (3)

Publication Number Publication Date
JPH1135573A true JPH1135573A (ja) 1999-02-09
JPH1135573A5 JPH1135573A5 (ja) 2004-10-21
JP3980124B2 JP3980124B2 (ja) 2007-09-26

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Cited By (159)

* Cited by examiner, † Cited by third party
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WO2007055272A1 (ja) 2005-11-11 2007-05-18 Tokyo Ohka Kogyo Co., Ltd. ポジ型レジスト組成物およびレジストパターン形成方法
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