{
  "timeline": [
    {
      "date": "1951/4",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "天然ガス化学工業を営むことを目的として、日本瓦斯化学工業株式会社を設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1952/9",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "榎工場メタノール製造設備操業開始（1974年12月生産停止）",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1954/2",
      "category": "株式上場",
      "region": "",
      "importance": 3,
      "event": "東京証券取引所に株式上場",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1957/4",
      "category": "組織再編|設備投資",
      "region": "",
      "importance": 3,
      "event": "日本尿素工業株式会社を吸収合併し、当社松浜工場（現当社新潟工場）として操業開始",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1960/5",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "日本樹脂化学工業株式会社水島工場（現当社水島工場）操業開始",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1962/1",
      "category": "会社設立",
      "region": "",
      "importance": 3,
      "event": "日本スチレンペーパー株式会社（現株式会社ＪＳＰ　現持分法適用会社）設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1968/1",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "水島工場にて当社の技術開発によるキシレン分離異性化装置の操業を開始",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1971/10",
      "category": "組織再編",
      "region": "",
      "importance": 3,
      "event": "三菱江戸川化学株式会社と合併し、三菱瓦斯化学株式会社と改称",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1978/10",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "鹿島工場操業開始　過酸化水素の製造を開始",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1979/11",
      "category": "会社設立",
      "region": "",
      "importance": 3,
      "event": "日本・サウジアラビアメタノール株式会社（現持分法適用関連会社）設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1982/10",
      "category": "企業買収",
      "region": "",
      "importance": 2,
      "event": "MITSUBISHI GAS CHEMICAL SINGAPORE PTE. LTD. （現連結子会社）設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1983/6",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "当社を中心に進めた「サウジメタノール計画」の現地法人 SAUDI METHANOL COMPAMY 操業開始",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1984/10",
      "category": "企業買収",
      "region": "",
      "importance": 2,
      "event": "MITSUBISHI GAS CHEMICAL AMERICA, INC. （現連結子会社）設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1991/3",
      "category": "会社設立|企業買収",
      "region": "",
      "importance": 3,
      "event": "エレクトロテクノ株式会社（現MGCエレクトロテクノ株式会社　現連結子会社）設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1992/3",
      "category": "会社設立|合弁設立",
      "region": "",
      "importance": 3,
      "event": "現地資本及び三菱商事株式会社と合弁でMETANOL DE ORIENTE, METOR, S.A. （現持分法適用関連会社）を設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1994/3",
      "category": "会社設立|企業買収|合弁設立",
      "region": "",
      "importance": 3,
      "event": "三菱化成株式会社（現三菱ケミカル株式会社）と合弁で三菱エンジニアリングプラスチックス株式会社（現連結子会社）を設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1995/1",
      "category": "企業買収",
      "region": "",
      "importance": 2,
      "event": "MGC PURE CHEMICALS AMERICA, INC. （現連結子会社）設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1995/7",
      "category": "企業買収|合弁設立",
      "region": "",
      "importance": 3,
      "event": "現地資本と合弁でTHAI POLYACETAL CO., LTD. （現連結子会社）を設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2000/7",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "社内カンパニー制発足",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2003/6",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "執行役員制導入",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2005/10",
      "category": "企業買収|組織再編|設備投資",
      "region": "",
      "importance": 3,
      "event": "大阪工場と富士化成株式会社を統合し、ＭＧＣフィルシート株式会社（現連結子会社）として発足",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2006/3",
      "category": "会社設立|合弁設立",
      "region": "",
      "importance": 3,
      "event": "現地資本及び伊藤忠商事株式会社と合弁でBRUNEI METHANOL CO., SDN. BHD. （現持分法適用会社）を設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2009/8",
      "category": "企業買収|海外進出",
      "region": "中国",
      "importance": 2,
      "event": "菱優工程塑料（上海）有限公司（現三菱瓦斯化学工程塑料（上海）有限公司　現連結子会社）設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2012/1",
      "category": "企業買収",
      "region": "",
      "importance": 2,
      "event": "MGC ELECTROTECHNO (THAILAND) CO., LTD. （現連結子会社）設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2013/3",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "CARIBBEAN GAS CHEMICAL LIMITED設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2018/7",
      "category": "会社設立|企業買収",
      "region": "",
      "importance": 3,
      "event": "三菱ガス化学トレーディング株式会社（現連結子会社）設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2018/12",
      "category": "会社設立|企業買収",
      "region": "",
      "importance": 3,
      "event": "泰興菱蘇機能新材料有限公司（現連結子会社）設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2020/4",
      "category": "組織再編",
      "region": "",
      "importance": 3,
      "event": "コーポレート部門、カンパニー部門を６つの部門に整理・統合",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/4",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "東京証券取引所の市場区分の見直しにより、東京証券取引所の市場第一部からプライム市場に移行",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    }
  ]
}