June 1970	Established company as a joint enterprise of Mitsubishi Electric Corporation and Mitsubishi Gas Chemical Company, Inc. with capital of 100,000,000 yen, with the insulation plant of Mitsubishi Electric Corporation Itami Works (current Itami Works and Transmission & Distribution Systems Center)
April 1971	Increased the capital to 300,000,000 yen
June 1979	Entered the inorganic materials business
June 1980	10th anniversary Established the corporate slogan “Ryoden Kasei, developing the technology of tomorrow”
March 1982	Established Tokyo Sales Office
February 1983	Established Osaka Sales Office
April 1985	Entered the IC card business
March 1987	Entered the analysis business
October 1987	Acquired Tajima Electron Co., Ltd. as an affiliated company
April 1988	Established Nagoya Sales Office
October 1989	Established Ryosei Co., Ltd.
November 1989	Entered the electronic high-purity resin business
December 1989	Established a new corporate slogan: “Proven technology with vision for the future”
June 1990	20th anniversary
March 1997	Started production of electromagnetic noise prevention materials (PDP shield plate)
February 1998	Entered the laminate bus bar business
October 1998	Changed the name of “Nagoya Sales Office” to Nagoya Branch”
January 1999	Obtained certification from the environmental measurement certification office
December 1999	Obtained certification for ISO14001
June 2000	30th anniversary
December 2002	Obtained certification for ISO9001 (varnish, resin, powdered paint)
January 2003	Obtained approval as a research organization listed by the Ministry of the Environment for soil contamination investigation (E2003-1-392)
October 2003	Started JIT activities
June 2008	Moved Tokyo Sales Office Changed the name of “Nagoya Branch” to “Nagoya Sales Office”
June 2010	40th anniversary
December 2011	Added the certification range ISO9001 *Prepregs, laminate bus bars
October 2013	Established new Overseas Sales Department
March 2020	Moved Nagoya Sales Office
June 2020	50th anniversary
July 2020	Reorganized Sales Department
April 2022	Reorganized 　Engineering　Dept.　and Materials　Analysis　Evaluation　Center