{
  "timeline": [
    {
      "date": "1935/2",
      "category": "会社設立",
      "region": "",
      "importance": 3,
      "event": "東洋曹達工業株式会社を設立",
      "detail": "山口県富田町(現周南市)で岩瀬徳三郎が理想的アンモニア法ソーダ工場の建設を目指して創立",
      "significance": "日本のソーダ工業勃興期に独立系メーカーとして誕生",
      "source": "有価証券報告書"
    },
    {
      "date": "1936/5",
      "category": "設備投資",
      "region": "",
      "importance": 2,
      "event": "南陽事業所でソーダ灰製造開始",
      "detail": "アンモニア法ソーダ工場完成",
      "significance": "創業翌年に主力製品の量産体制を確立",
      "source": "有価証券報告書"
    },
    {
      "date": "1942/2",
      "category": "研究開発",
      "region": "",
      "importance": 2,
      "event": "海水直接法による国産初の臭素製造を開始",
      "detail": "アンチノック剤原料としての臭素需要増に対応",
      "significance": "戦時統制下の国産化政策に呼応した技術自立",
      "source": "有価証券報告書"
    },
    {
      "date": "1943/2",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "南陽事業所で苛性ソーダ製造設備新設",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1949/5",
      "category": "株式上場",
      "region": "",
      "importance": 2,
      "event": "東京証券取引所に株式上場",
      "detail": "",
      "significance": "戦後復興期に資本市場との接続を確立",
      "source": "有価証券報告書"
    },
    {
      "date": "1951/7",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "東洋港運株式会社を設立",
      "detail": "現・東ソー物流株式会社",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1953/10",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "小野田セメントとの提携でセメント製造を開始",
      "detail": "事業多角化の第一歩",
      "significance": "「三白景気」の波に乗りソーダ専業から多角化へ転換",
      "source": "有価証券報告書"
    },
    {
      "date": "1954",
      "category": "社長交代",
      "region": "",
      "importance": 2,
      "event": "二宮善基が社長に就任",
      "detail": "3代目貞長敬の急逝を受けた登板",
      "significance": "合理化・設備投資・新規事業を推進する戦後成長期の体制を確立",
      "source": ""
    },
    {
      "date": "1955/6",
      "category": "企業買収",
      "region": "",
      "importance": 1,
      "event": "日本オルガノ商会に資本参加",
      "detail": "現・オルガノ株式会社",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1959/10",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "日本シリカ工業株式会社を設立",
      "detail": "現・東ソー・シリカ株式会社",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1962/3",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "南陽事業所で燐酸製造設備新設",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1964",
      "category": "組織再編",
      "region": "",
      "importance": 3,
      "event": "周南地区石油化学コンビナート発足を機に石油化学進出を決定",
      "detail": "徳山曹達と合弁で周南石油化学を設立しEDC工場新設",
      "significance": "ソーダ専業から石油化学への業態転換の起点",
      "source": ""
    },
    {
      "date": "1965/7",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "ストウファー・ケミカル社と合弁で東洋ストウファー・ケミカルを設立",
      "detail": "現・東ソー・ファインケム",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1966/5",
      "category": "研究開発",
      "region": "",
      "importance": 2,
      "event": "塩化ビニルモノマー製造設備新設(自社オキシクロネーション法)",
      "detail": "",
      "significance": "自社技術による塩ビモノマー生産で石油化学基盤を確立",
      "source": "有価証券報告書"
    },
    {
      "date": "1966/9",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "低密度ポリエチレン製造設備新設",
      "detail": "日本ポリケミカルを通じ高圧ポリエチレン工場稼働",
      "significance": "周南コンビナート主軸製品としてポリオレフィン事業に参入",
      "source": "有価証券報告書"
    },
    {
      "date": "1967/10",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "エチレンアミン製造設備新設",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1969/4",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "日ケミ商事株式会社を設立",
      "detail": "現・東ソー・ニッケミ",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1971/3",
      "category": "組織再編",
      "region": "",
      "importance": 3,
      "event": "四日市事業所建設に着手",
      "detail": "大協和石油化学コンビナートの中核企業として進出",
      "significance": "1社1工場体制を脱し総合化学への基盤を獲得",
      "source": ""
    },
    {
      "date": "1971/4",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "液体クロマトグラフィー用カラムを開発し科学計測事業に進出",
      "detail": "",
      "significance": "装置事業から計測・バイオ機器分野への多角化の起点",
      "source": "有価証券報告書"
    },
    {
      "date": "1971/5",
      "category": "企業買収",
      "region": "",
      "importance": 1,
      "event": "太平化学製品株式会社に資本参加",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1971/6",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "クロロプレンゴム製造設備新設",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1973/9",
      "category": "企業買収",
      "region": "",
      "importance": 1,
      "event": "プラス・テク株式会社に資本参加",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1973/11",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "三菱商事と共同出資でギリシャにテッコウシャ・ヘラスを設立",
      "detail": "電解二酸化マンガン製造",
      "significance": "海外生産拠点の第一号",
      "source": "有価証券報告書"
    },
    {
      "date": "1975/4",
      "category": "組織再編",
      "region": "",
      "importance": 4,
      "event": "株式会社鐵興社と合併し7工場体制となる",
      "detail": "南陽・四日市・酒田・山形・富山・日向・石巻",
      "significance": "フェロアロイメーカーを取り込み総合化学会社への規模拡大を達成",
      "source": "有価証券報告書"
    },
    {
      "date": "1975/4",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "東京研究センター完成(神奈川県綾瀬市)",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "1975/5",
      "category": "",
      "region": "東南アジア",
      "importance": 1,
      "event": "三井物産・現地資本と共同出資でインドネシアにPT.スタンダード・トーヨー・ポリマー設立",
      "detail": "塩ビポリマー製造",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1975/9",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "日本ハロン株式会社を設立",
      "detail": "現・東ソー・ファインケム",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1978",
      "category": "",
      "region": "欧州",
      "importance": 1,
      "event": "オランダでエチレンアミン製造開始",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "1979/6",
      "category": "",
      "region": "米州",
      "importance": 1,
      "event": "北米にトーソー・USA, Inc.を設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1981/7",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "東ソー有機化学株式会社を設立",
      "detail": "塩ビペースト製造",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1982/6",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "南陽事業所に石炭専焼ボイラー新設",
      "detail": "オイルショック後の燃料転換",
      "significance": "2度のオイルショック後の構造改善とエネルギー自立化",
      "source": ""
    },
    {
      "date": "1983/3",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "酒田・石巻両工場を分離し東北東ソー化学株式会社を設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1983/9",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "ジルコニア粉末製造設備新設",
      "detail": "スペシャリティ材料事業への布石",
      "significance": "後の高機能材料事業の基盤",
      "source": "有価証券報告書"
    },
    {
      "date": "1984",
      "category": "社長交代",
      "region": "",
      "importance": 2,
      "event": "山口敏明が社長に就任",
      "detail": "6代目森崎東三の急逝を受けた登板",
      "significance": "クロール・アルカリのトップ化と新規事業育成を主導",
      "source": ""
    },
    {
      "date": "1986/4",
      "category": "企業買収",
      "region": "",
      "importance": 1,
      "event": "日本石英硝子・山口日本石英に資本参加",
      "detail": "現・東ソー・クォーツ/エスジーエム",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1986/4",
      "category": "企業買収",
      "region": "欧州",
      "importance": 1,
      "event": "ベルギーのユーロ・ジェネティクスN.V.へ資本参加",
      "detail": "現・トーソー・ヨーロッパ",
      "significance": "診断システム事業の海外基盤",
      "source": "有価証券報告書"
    },
    {
      "date": "1987/5",
      "category": "",
      "region": "米州",
      "importance": 1,
      "event": "ローム・アンド・ハース社と合弁で北米にトーソー・ハースを設立",
      "detail": "現・トーソー・バイオサイエンスLLC",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1987/10",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "東洋曹達工業から東ソー株式会社へ商号変更",
      "detail": "CI導入と企業理念策定を伴う",
      "significance": "スペシャリティ事業強化と国際化対応への姿勢を社名で表明",
      "source": "有価証券報告書"
    },
    {
      "date": "1988/6",
      "category": "企業買収",
      "region": "米州",
      "importance": 2,
      "event": "北米VARIAN社よりターゲット部門を買収しトーソー・SMD, Inc.を設立",
      "detail": "スパッタリングターゲット事業",
      "significance": "半導体材料事業への本格参入",
      "source": "有価証券報告書"
    },
    {
      "date": "1989/4",
      "category": "",
      "region": "米州",
      "importance": 1,
      "event": "北米にトーソー・アメリカ, Inc.を設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1989/10",
      "category": "企業買収",
      "region": "米州",
      "importance": 1,
      "event": "北米ワイス・サイエンティフィック・グラスブローイングCoに資本参加",
      "detail": "現・トーソー・クォーツInc.",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1990/10",
      "category": "組織再編",
      "region": "",
      "importance": 4,
      "event": "新大協和石油化学および四日市ポリマーと合併",
      "detail": "オレフィンと誘導品の石油化学一貫体制を確立",
      "significance": "興銀系総合化学会社として日本を代表する規模を獲得",
      "source": "有価証券報告書",
      "amount": "売上高約3300億円規模へ拡大"
    },
    {
      "date": "1991/4",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "筑波研究所完成",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "1993/3",
      "category": "企業買収",
      "region": "",
      "importance": 1,
      "event": "北越化成株式会社に資本参加",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1994/5",
      "category": "",
      "region": "東南アジア",
      "importance": 1,
      "event": "フィリピンにフィリピン・レジンズ・インダストリーズを設立",
      "detail": "三菱商事と合弁",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1994/11",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "東ソー塩ビ加工開発株式会社を設立",
      "detail": "現・大洋塩ビ",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1994/12",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "スパッタリングターゲット部門を分離し東ソー・スペシャリティマテリアル設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1995/7",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "日向工場を分離し東ソー日向株式会社を設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1998/7",
      "category": "",
      "region": "東南アジア",
      "importance": 1,
      "event": "フィリピンにトーソー・ポリビンCoを設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1999/5",
      "category": "",
      "region": "中国",
      "importance": 1,
      "event": "台湾にトーソー・クォーツ・タイワンを設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1999/6",
      "category": "設備投資",
      "region": "",
      "importance": 3,
      "event": "ビニル・チェーン関連大型投資により苛性ソーダ・塩ビモノマー年産100万t体制を確立",
      "detail": "南陽・四日市事業所",
      "significance": "塩ビ・ソーダ事業の国内最大級プレイヤーとしての地位を確立",
      "source": "有価証券報告書",
      "amount": "年産100万t"
    },
    {
      "date": "2000/8",
      "category": "企業買収",
      "region": "東南アジア",
      "importance": 1,
      "event": "フィリピンのマブハイ・ビニルCoに資本参加",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2004/3",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "プラス・テクおよびフィリピン・レジンズを連結子会社化",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2004/12",
      "category": "",
      "region": "中国",
      "importance": 1,
      "event": "中国に東曹（広州）化工有限公司を設立",
      "detail": "三菱商事・丸紅・三井物産と共同出資",
      "significance": "中国市場への本格進出",
      "source": "有価証券報告書"
    },
    {
      "date": "2005/11",
      "category": "",
      "region": "中国",
      "importance": 1,
      "event": "中国に日本ポリウレタン（瑞安）有限公司を設立",
      "detail": "現・東曹（瑞安）ポリウレタン",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2008/4",
      "category": "設備投資",
      "region": "",
      "importance": 3,
      "event": "ビニル・イソシアネート・チェーン大型投資完了",
      "detail": "自家発電100万kw・MDI年産40万t体制",
      "significance": "塩ビ・ウレタン一貫体制で国内最大級の生産能力を確立",
      "source": "有価証券報告書",
      "amount": "自家発電100万kw/MDI40万t"
    },
    {
      "date": "2008/6",
      "category": "社長交代",
      "region": "",
      "importance": 2,
      "event": "宇田川憲一が代表取締役社長に就任",
      "detail": "土屋隆からの交代",
      "significance": "リーマンショック直前の社長交代",
      "source": "有価証券報告書"
    },
    {
      "date": "2009/3",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "初の連結営業赤字・純損失に転落",
      "detail": "リーマンショックによる需要急減",
      "significance": "21世紀以降最大の業績悪化で構造改革の起点となった",
      "source": "有価証券報告書",
      "amount": "営業赤字▲203億円・純損失▲253億円"
    },
    {
      "date": "2012/9",
      "category": "",
      "region": "中国",
      "importance": 1,
      "event": "中国に日本ポリウレタン科技（上海）有限公司を設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2014/10",
      "category": "組織再編",
      "region": "",
      "importance": 3,
      "event": "日本ポリウレタン工業株式会社と合併",
      "detail": "ビニル・イソシアネート・チェーンの一貫体制を確立",
      "significance": "MDI事業の完全内製化でウレタン事業の競争力を強化",
      "source": "有価証券報告書"
    },
    {
      "date": "2015/2",
      "category": "",
      "region": "東南アジア",
      "importance": 1,
      "event": "マレーシアにトーソー・アドバンスド・マテリアルズSdn.Bhdを設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2016/6",
      "category": "社長交代",
      "region": "",
      "importance": 2,
      "event": "山本寿宣が代表取締役社長に就任",
      "detail": "宇田川憲一からの交代",
      "significance": "スペシャリティ強化路線を本格化させた経営者交代",
      "source": "有価証券報告書"
    },
    {
      "date": "2018/3",
      "category": "",
      "region": "中国",
      "importance": 1,
      "event": "中国に東曹（中国）投資有限公司を設立",
      "detail": "中国事業統括会社",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/6",
      "category": "社長交代",
      "region": "",
      "importance": 2,
      "event": "桒田守が代表取締役社長に就任",
      "detail": "山本寿宣からの交代",
      "significance": "Vision2030「成長と脱炭素の両立」を掲げる体制へ移行",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/4",
      "category": "",
      "region": "東南アジア",
      "importance": 1,
      "event": "ベトナムにトーソー・ベトナム・ポリウレタンCo.Ltdを設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2025/4",
      "category": "経営計画",
      "region": "",
      "importance": 3,
      "event": "新中期経営計画(2025-2027年度)始動",
      "detail": "事業区分を「チェーン事業/先端事業」の2区分に再編",
      "significance": "コモディティ/スペシャリティ区分から脱却し2030年営業利益1700億円目標を掲げる",
      "source": "IR",
      "amount": "3ヵ年設備投資2200-2500億円・自社株500億円取得"
    },
    {
      "date": "2025/11",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "FY2025通期業績予想を下方修正",
      "detail": "SMD減損191億円計上等",
      "significance": "需要低調と海外市況下振れで中計初年度から下方修正",
      "source": "IR",
      "amount": "純利益620→380億円(△38.7%)"
    }
  ]
}