JPH1135551A - 新規なスルホニルジアゾメタン化合物 - Google Patents

新規なスルホニルジアゾメタン化合物

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Publication number
JPH1135551A
JPH1135551A JP9198953A JP19895397A JPH1135551A JP H1135551 A JPH1135551 A JP H1135551A JP 9198953 A JP9198953 A JP 9198953A JP 19895397 A JP19895397 A JP 19895397A JP H1135551 A JPH1135551 A JP H1135551A
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Prior art keywords
bis
methane
compound
group
acid
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JP3854689B2 (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
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Daito Kemitsukusu Kk
Tokyo Ohka Kogyo Co Ltd
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Daito Kemitsukusu Kk
Tokyo Ohka Kogyo Co Ltd
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Priority to US09/119,640 priority patent/US5945517A/en
Publication of JPH1135551A publication Critical patent/JPH1135551A/ja
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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、十分な
感度を示す新規なスルホニルジアゾメタン化合物を提供
する。 【解決手段】 一般式 【化1】 (R1は低級アルキレン基、R2は第三アルキル基)で表
わされるスルホニルジアゾメタン化合物とする。

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
劣り、また満足すべき感度が得られにくいという欠点が
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、十分な感度を示す新規なスルホニル
ジアゾメタン化合物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、十分な感度を示す新規な
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、ビスフェニルスルホニルジアゾメタンの2個のフ
ェニル基に、酸解離性基として第三アルコキシカルボニ
ルアルコキシ基を導入した化合物とすることにより、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R1は低級アルキレン基、R2は第三アルキル基
である)で表わされる新規なスルホニルジアゾメタン化
合物を提供するものである。
【0009】この一般式(I)におけるR1の低級アル
キレン基は、炭素数1〜4のアルキレン基であり、これ
は直鎖状又は枝分れ状のいずれでもよい。このような低
級アルキレン基の例としては、メチレン基、エチレン
基、トリメチレン基、テトラメチレン基、イソプロピレ
ン基、イソブチレン基などを挙げることができる。ま
た、一般式(I)におけるR2の第三アルキル基の例と
しては、炭素数4〜8の第三アルキル基、例えば第三ブ
チル基、第三ペンチル基、1,1‐ジメチルブチル基な
どを挙げることができる。
【0010】
【発明の実施の形態】本発明の化合物は、例えば次に示
す反応式に従い、チオフェノール(II)に、メチレン
ハライド(III)を縮合させてビス(ヒドロキシフェ
ニルチオ)メタン(IV)を生成させ、次いでこれを酸
化してビス(ヒドロキシフェニルスルホニル)メタン
(V)を生成させ、これにω‐ハロゲノアルカン酸第三
アルキル(VI)を反応させたのち、ジアゾ化するか、
あるいはビス(ヒドロキシフェニルスルホニル)メタン
をジアゾ化したのち、ω‐ハロゲノアルカン酸第三アル
キルを反応させることにより製造することができる。
【0011】
【化3】 (ただし、X、X′はハロゲン原子)
【0012】この反応において用いるメチレンハライド
(III)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。ま
た、ω‐ハロゲノアルカン酸第三アルキル(VI)の例
としては、クロロ酢酸、ブロモ酢酸、3‐クロロプロピ
オン酸、3‐ブロモプロピオン酸、4‐クロロ酪酸又は
4‐ブロモ酪酸の第三ブチルエステル、第三ペンチルエ
ステル又は1,1‐ジメチルブチルエステルなどを挙げ
ることができる。
【0013】前記反応式におけるチオフェノール(I
I)とメチレンハライド(III)との縮合は、不活性
溶媒例えばアセトン中において、第四アンモニウム塩例
えばテトラブチルアンモニウムハライドと炭酸アルカリ
との組み合せのような脱ハロゲン化水素剤を用いて行わ
れる。
【0014】次に、このようにして得たビス(ヒドロキ
シフェニルチオ)メタン(IV)を酸化して対応するビ
ス(ヒドロキシフェニルスルホニル)メタン(V)を生
成する反応は、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。
【0015】また、ビス(ヒドロキシフェニルスルホニ
ル)メタン(V)又はそのジアゾ化物(VIII)に第
三アルコキシカルボニルアルコキシ基を導入する反応
は、ジメチルホルムアミドのような不活性溶媒中で炭酸
アルカリのようなアルカリの存在下、ω‐ハロゲノアル
カン酸第三アルキル(VI)を反応させることにより行
うことができる。
【0016】さらに、ビス(ヒドロキシフェニルスルホ
ニル)メタン(V)又はその第三アルコキシカルボニル
アルコキシ化物(VII)のジアゾ化は、エタノールの
ような不活性溶媒中、第三アミン例えばトリエチルアミ
ン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。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 4‐ヒドロキシベンゼンチオール50g(0.40モ
ル)とテトラブチルアンモニウムブロミド1.5g
(0.006モル)をアセトン250g中に溶かし、こ
れに炭酸カリウム43g(0.31モル)を加えた。次
いでメチレンブロミド40g(0.23モル)を45℃
において30分間にわたって滴下した。この混合物をさ
らに45℃で8時間かき混ぜたのち、析出した臭化カリ
ウムをろ別し、溶媒を真空下40℃で留去し、次いで得
られた生成物に水500gを加え、酢酸エチル600g
で抽出後、溶媒を留去しビス(4‐ヒドロキシフェニル
チオ)メタンを黄色油状物として得た。
【0020】次に、このビス(4‐ヒドロキシフェニル
チオ)メタン50g(0.19モル)をエタノール27
5gに溶かし、タングステン酸ナトリウム5g(0.0
2g)を加えた。これに35%過酸化水素水162g
(1.67モル)を50℃において、1時間にわたって
滴下した。この反応混合物をさらに50℃で5時間かき
混ぜた。次いで、30%水酸化ナトリウム水溶液で中和
し、析出した結晶をろ取した。このようにしてビス(4
‐ヒドロキシフェニルスルホニル)メタンを白色結晶と
して得た。
【0021】次に、このビス(4‐ヒドロキシフェニル
スルホニル)メタン30g(0.09モル)をジメチル
ホルムアミド160gに溶かし、炭酸カリウム28g
(0.20モル)を加えた。これにクロロ酢酸tert
‐ブチル30g(0.20モル)を室温において30分
にわたって滴下した。この混合物をさらに80℃で3時
間かき混ぜたのち、室温まで冷却し、炭酸カリウムをろ
別し、次いで希塩酸1200gで洗浄し、ビス(4‐t
ert‐ブトキシカルボニルメチルオキシフェニルスル
ホニル)メタン42.0gを黄色油状物として得た。
【0022】最後に、このビス(4‐tert‐ブトキ
シカルボニルメチルオキシフェニルスルホニル)メタン
30g(0.054モル)とトシルアジド15g(0.
076モル)をエタノール300gに溶かし、これにト
リエチルアミン12.5g(0.12モル)を室温で3
0分間にわたって滴下した。この混合物をさらに室温で
1.5時間かき混ぜたのち、析出した結晶をろ取し、得
られた最終生成物をアセトニトリルから繰り返し再結晶
し、目的物であるビス(4‐tert‐ブトキシカルボ
ニルメチルオキシフェニルスルホニル)ジアゾメタン1
3.0gを得た。その化合物の融点は98℃、分解点は
114℃であった。図1及び図2にこの化合物の赤外吸
収スペクトル及びプロトン核磁気共鳴スペクトルを示
す。
【0023】実施例2 実施例1と同様にしてビス(4‐ヒドロキシフェニルス
ルホニル)メタンを製造し、これにクロロ酢酸tert
‐ブチル30gの代りに3‐クロロプロピオン酸ter
t‐ブチル33gを用い、同様に操作することによりビ
ス(4‐tert‐ブトキシカルボニルエチルオキシフ
ェニルスルホニル)ジアゾメタン13.5gを得た。
【0024】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(4‐tert‐ブトキシカル
ボニルメチルオキシフェニルスルホニル)ジアゾメタン
5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。
【0025】(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。
【0026】(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。
【0027】(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。
【0028】(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。
【0029】(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
厚の割合として示した。
【0030】
【表1】
【0031】
【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がよいため、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。ま
た、本発明化合物は、第三アルキル基が酸により切断さ
れ、残基からはカルボン酸が生成するので高感度を示す
という利点もある。
【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+H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

Claims (3)

    【特許請求の範囲】
  1. 【請求項1】 一般式 【化1】 (式中のR1は低級アルキレン基、R2は第三アルキル基
    である)で表わされるスルホニルジアゾメタン化合物。
  2. 【請求項2】 R1がメチレン基である請求項1記載の
    スルホニルジアゾメタン化合物。
  3. 【請求項3】 R2が第三ブチル基である請求項1又は
    2記載のスルホニルジアゾメタン化合物。
JP19895397A 1996-07-24 1997-07-24 新規な光酸発生剤 Expired - Fee Related JP3854689B2 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP19895397A JP3854689B2 (ja) 1997-07-24 1997-07-24 新規な光酸発生剤
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
JP19895397A JP3854689B2 (ja) 1997-07-24 1997-07-24 新規な光酸発生剤

Publications (2)

Publication Number Publication Date
JPH1135551A true JPH1135551A (ja) 1999-02-09
JP3854689B2 JP3854689B2 (ja) 2006-12-06

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KR20010095756A (ko) * 2000-04-11 2001-11-07 우재영 신규한 비스(메틸-할로-페닐술포닐)다이아조메탄류 화합물및 그의 제조방법
JP2003527355A (ja) * 2000-02-27 2003-09-16 シップレーカンパニー エル エル シー 光反応性酸発生剤およびそれを含有してなるフォトレジスト
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
JP2007197389A (ja) * 2006-01-27 2007-08-09 Idemitsu Kosan Co Ltd 環状化合物、並びにそれからなるフォトレジスト基材及び組成物
KR100752497B1 (ko) 2003-02-13 2007-08-28 신에쓰 가가꾸 고교 가부시끼가이샤 신규 술포닐디아조메탄 화합물, 광산 발생제 및 이것을사용한 레지스트 재료 및 패턴 형성 방법
WO2008012999A1 (en) 2006-07-24 2008-01-31 Tokyo Ohka Kogyo Co., Ltd. Positive resist composition and method of forming resist pattern
US7491485B2 (en) 2007-05-23 2009-02-17 Tokyo Ohka Kogyo Co., Ltd. Resist composition and method of forming resist pattern
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