{
  "spec_version": "3",
  "endpoint": "timeline",
  "stock_code": "4628",
  "company_name": "エスケー化研",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/4628/",
  "api_url": "/api/4628/timeline.json",
  "updated": "2026-09-06",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/4628/",
  "source": {
    "primary": [
      "有価証券報告書",
      "公式サイト"
    ],
    "extraction": "有価証券報告書の沿革を基礎に、社史・報道で補完",
    "row_field": "source"
  },
  "timeline": [
    {
      "date": "1955/7",
      "importance": 2,
      "event": "藤井實氏が四国化学研究所を創業",
      "source": "有価証券報告書"
    },
    {
      "date": "1958/4",
      "importance": 2,
      "event": "個人経営から株式会社に改組",
      "source": "有価証券報告書"
    },
    {
      "date": "1961/8",
      "importance": 1,
      "event": "本社を移転",
      "source": "有価証券報告書"
    },
    {
      "date": "1961/8",
      "importance": 2,
      "event": "大阪工場を建設",
      "source": "有価証券報告書"
    },
    {
      "date": "1963/6",
      "importance": 2,
      "event": "四国化研工業に商号変更",
      "source": "有価証券報告書"
    },
    {
      "date": "1967/12",
      "importance": 1,
      "event": "東京工場を建設",
      "source": "有価証券報告書"
    },
    {
      "date": "1972",
      "importance": 3,
      "event": "外装用吹付タイルを開発",
      "source": "公式サイト"
    },
    {
      "date": "1979/12",
      "importance": 1,
      "event": "福岡工場を建設",
      "source": "有価証券報告書"
    },
    {
      "date": "1981/8",
      "importance": 2,
      "event": "SKK(S)PTE.LTD.を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1983/6",
      "importance": 1,
      "event": "大利根工場を建設",
      "source": "有価証券報告書"
    },
    {
      "date": "1984/10",
      "importance": 3,
      "event": "セラミック系耐火被覆材の製造販売を開始",
      "source": "有価証券報告書"
    },
    {
      "date": "1987/5",
      "importance": 1,
      "event": "名古屋工場を建設",
      "source": "有価証券報告書"
    },
    {
      "date": "1991/1",
      "importance": 1,
      "event": "兵庫工場を建設",
      "source": "有価証券報告書"
    },
    {
      "date": "1991/4",
      "importance": 2,
      "event": "エスケー化研に商号変更",
      "source": "有価証券報告書"
    },
    {
      "date": "1992/3",
      "importance": 1,
      "event": "SKK CHEMICAL(M)SDN.BHD.を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1992/7",
      "importance": 2,
      "event": "研究所を建設",
      "source": "有価証券報告書"
    },
    {
      "date": "1993/3",
      "importance": 1,
      "event": "九州工場を建設し福岡工場を移転",
      "source": "有価証券報告書"
    },
    {
      "date": "1994/10",
      "importance": 1,
      "event": "日本証券業協会に株式を店頭登録",
      "source": "有価証券報告書"
    },
    {
      "date": "1996/1",
      "importance": 2,
      "event": "無機質の不燃耐火断熱材の製造販売を開始",
      "source": "有価証券報告書"
    },
    {
      "date": "2001/9",
      "importance": 2,
      "event": "SIKOKUKAKEN(SHANGHAI)CO.,LTD.を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2001/9",
      "importance": 1,
      "event": "埼玉工場を取得",
      "source": "有価証券報告書"
    },
    {
      "date": "2003/11",
      "importance": 1,
      "event": "上海工場を建設",
      "source": "有価証券報告書"
    },
    {
      "date": "2004/12",
      "importance": 1,
      "event": "ジャスダック証券取引所に株式を上場",
      "source": "有価証券報告書"
    },
    {
      "date": "2010/2",
      "importance": 1,
      "event": "SKK CHEMICAL(THAILAND)CO.,LTD.を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2010/4",
      "importance": 1,
      "event": "大阪証券取引所JASDAQに上場",
      "source": "有価証券報告書"
    },
    {
      "date": "2013/7",
      "importance": 1,
      "event": "東京証券取引所JASDAQに上場",
      "source": "有価証券報告書"
    },
    {
      "date": "2014/5",
      "importance": 1,
      "event": "PT SKK KAKEN INDONESIAを設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2017/4",
      "importance": 3,
      "event": "藤井実広氏が社長に就任",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/4",
      "importance": 1,
      "event": "スタンダード市場に移行",
      "source": "有価証券報告書"
    }
  ]
}