History
| September 1964 | Takaroku Shoji Co. Ltd. Established in Higashi Nippori 3-chome, Arakawa-ku, Tokyo. Rokuzo Takahashi assumes the position of the first president. In the same year, the Kawaguchi Factory was set up in Ankou, Kawaguchi City, as a dedicated factory for coloring. |
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| June 1971 | Established Kandatsu Factory within Heisei Polymer Co., Ltd. |
| June 1971 | Established Osaka branch in Tennoji Ward. |
| July 1977 | Established Jonan Sales Office in Shinagawa-ku, Tokyo. |
| August 1985 | Mr. Gensaku Takahashi appointed as president. |
| October 1986 | Relocated the Head Office to the newly-built Takaroku Shoji Building in Arakawa-ku, Tokyo. |
| August 1987 | Seven companies invested in Takaroku Shoji Co. Ltd.: Japan Polyolefins Corporation, Nippon A&L Inc., DIC Corporation, Denka Company Limited, Maruzen Petrochemical Co., Ltd., Plas-tech Corporation, Mitsubishi Gas Chemical Company Inc. |
| December 1988 | Established West Kanto Sales Office in Kokubunji, Tokyo. |
| January 1990 | Opened Kyoto Sales Office in Fushimi-ku, Kyoto. |
| July 1990 | Established North Kanto Factory in Otone Toyodai Techno Town, Saitama Prefecture. |
| March 1992 | Opened the North Kanto Sales Office in the North Kanto Factory. |
| July 1996 | Opened Indian Office in Mumbai. |
| December 1999 | Osaka Branch relocated to purchased premises at the Takaroku Osaka Building in Nishi-ku, Osaka Prefecture. |
| March 2000 | Established East Kanto Sales Office in Chiba City. |
| May 2001 | Opened Hong Kong Sales Office. |
| July 2002 | Opened Tianjin Sales Office. |
| May 2003 | The Kyoto Sales Office was closed and integrated into the Osaka Branch. |
| August 2003 | Tianjin Factory completed. |
| April 2004 | Opened Shanghai Sales Office. |
| October 2005 | West Kanto Sales Office and Jonan Sales Office were merged, and South Kanto Sales Office was opened in the Takaroku Dai-san Building in Machida City, Tokyo. |
| July 2007 | Head Office relocated to purchased premises at 6F Station Port Tower Building in Arakawa-ku. The East Kanto Sales Office was also integrated as the Head Office Sales Department. Established Takapura Recycle Corporation in Nasu-gun, Tochigi Prefecture. |
| October 2008 | Opened Kyushu Sales Office in Chikushino City, Fukuoka Prefecture. |
| April 2011 | Invested in Hinomaru Synthetic Plastic Industry Co., Ltd. and transferred it to the Takaroku Shoji Group. |
| August 2011 | Established Takaroku Plastics Co., Ltd. in Taiwan. |
| July 2012 | The coloring business of the Kawaguchi Factory was consolidated at the Kita Kanto Factory, and the Kawaguchi Factory was converted to the Koroku Shoji Logistics Center. |
| September 2013 | Opened Nagoya Sales Office |
| April 2014 | Opened Detroit Branch in the United States. |
| November 2016 | Shunsaku Takahashi became president. |
| August 2019 | Shunsaku Takahashi became CEO. |
| July 2023 | Head Office relocated to Bunkyo Green Court in Honkomagome, Bunkyo-ku. |
| January 2024 | Satoshi Murata became CEO. |