|1947||Kokuka Sangyo Kaiun Co., Ltd. is established, with marine transport operation, non-life insurance agent operation and commercial business operation. Begins shipping operations for coals, Carbon sulfide and Sodium hydroxide.
Headquarters is established in Ikuta-ku in Kobe City with JPY195,000 in capital.
|1952||Headquarters is relocated to Kita-ku, Osaka City.|
|1954||The company name is changed to KOKUKA SANGYO CO., LTD.|
|1956||First Sodium hydroxide carrier is completed.|
Mihara Branch opens.
|1960||First chemicals tanker gKOKURYU MARUh is completed, begins domestic operation.|
|1961||Capital increases to JPY 5 million by capital participation of Japan Gas Chemical Co., Inc. (current MITSUBISHI GAS CHEMICAL COMPANY, INC.).|
|1964||A chemicals tanker gKOKUHO MARUh is completed, enters oceangoing business.|
The worldfs first tanker for high temperature molten materials gOUKA MARUh is completed for shipping Molten phthalic anhydride.
The Japanfs first medium temperature, medium pressure ammonia tanker gKOKUSHU MARUh is completed.
|1967||The worldfs first molten Caprolactam carrier gEIKA MARUh is completed.|
Japanfs first molten Sulphur carrier gKOKA MARUh is completed.
|1968||Tokyo branch opens in Nishi-shinbashi, Minato-ku, Tokyo.|
|Stainless tanker gYUKA MARUh is completed.|
|1975||Capital increases to JPY 250 million, Matsuyama Branch opens.|
|1980||IWAI KAIUN LTD. is established.|
|1989||Container ship gNISHO MARUh is completed.|
|2001||Stock is transferred from TEIJIN LIMITED to MITSUBISHI GAS CHEMICAL COMPANY, INC.|
|2002||Enters business of shipping Methanol from Saudi Arabia.|
|2003||Enters business of shipping Methanol from Venezuela.|
|2005||Headquarters is relocated to Toranomon, Minato-ku, Tokyo.|
A Hydrogen peroxide carrier gRYOJITSU MARUh is completed.
|2008||Super eco ship gKOKUHO MARUh is completed.|
|2009||Our largest chemicals tanker gJOSE PROGRESSh is completed.|
|2010||Headquarters is relocated to Uchisaiwaicho, Chiyoda-ku,Tokyo.|
|2011||Capital reduction to JPY 100 million.|
|2013||Receives TATSUMI SHOKAI CO., LTD.'s capital participation.|
|2015||An LAG carrier "KOKUSHU MARU" is completed.|
|2020||Headguarters is rebcated to Shimbashi,Minato-ku,Tokyo.|