|1911||Kawahara Corporation (Osaka headquarters) opens a branch in Makassar on Celebes Island in the East Indies, controlled by the Holland.|
|1926||Kawahara Corporation separates overseas operations, Hirokata Ueda forms Kohyei Trading company.|
|1949||February||Kohyei was founded in Shosen building in Kobe's Motomachi district to take advantage of renewed opportunities in civilian trade.
Capital was 2 million yen.
Hidehiko Tsuchihashi named President.
|August||Signed sole agent agreement with Sakai Chemical Industrial Co. (Agency No.1)|
|October||Tokyo Branch founded.|
|1951||January||Osaka branch founded.|
|December||Increased capital to 5 million yen.|
|1952||Signed special agreement with DuPont to import synthetic rubber "neoprene" and began development of rubber chemical products import from the company.|
|1953||March||Otaru branch founded.
|August||Increased capital to 8 million yen.|
|1954||May||Increased capital to 10 million yen.
Signed agent agreement with Nitto Kasei Co.
|1957||Ended handling of natural rubber, agricultural chemicals. Withdrew from commodity products focusing on synthetic rubber and resin, industrial chemicals, steelmaking materials.|
|1959||Celebrated 10-year anniversary as earnings grew amid economic expansion.
Relocated Otaru branch to Sapporo.
|1960||Showa Neoprene Co.,Ltd. founded for domestic production of DuPont's product, Kohyei becomes a distribution agent.|
|May||Increased capital to 20 million yen.|
|1961||Signed specialty and agency agreements with domestic makers to create a foothold as a trading company specializing in rubber and industrial chemicals.|
|1963||December||Atsuhide Tsuchihashi named President.|
|1967||January||Increased capital to 50 million yen.|
|1969||February||Celebrated 20-year anniversary.|
|November||Establishment of Nisshoku Schenectady Kagaku Inc., a joint venture between Nippon Shokubai Co., Ltd. and Schenectady Chemicals Inc.(USA)|
|December||Schenectady Chemicals Inc.(USA) and Harima Kagaku form a Harima Schenectady Chemical joint venture.
Founded Harima Schenectady Kagaku, Inc.
Increased capital to 60 million yen.
|1971||February||Increased capital to 90 million yen.|
|1972||October||Founded ZipperTubing (Japan) Ltd.|
|1974||November||Sapporo branch is formed into a new company,Sapporo Kohyei Co.,Ltd.|
|December||Increased capital to 100 million yen.|
|1976||Posted record sales on demand automotive and consumer AV electronics goods.|
|1978||Products of ZipperTubing (Japan) Ltd. used by automotive clients.|
|1979||Celebrated 30-year anniversary.|
|1981||February||Formed a fully-owned subsidiary Kurinsuton Manufacturing Co.,Ltd.for domestic manufacturing of CleanStone outer wall detergent.|
|October||Annual revenue reached 20 billion yen.
Split investment in Vernay Japan (currently Kohyei Kosan Co.,Ltd.) with Vernay Laboratories Inc.
|1986||November||Changed Vernay Japan name to Kohyei Kosan Co.,Ltd.|
|1987||November||Moved headquarter sales department to Osaka, merged with Hanshin sales department.|
|1988||September||Founded Kohyei Kohan Inc.,to handle manufacturing and processing of industrial rubber and resin products.|
|1989||February||Celebrated 40-year anniversary.|
|December||President Atsuhide Tsuchihashi named Chairman.
Mr. Hideo Kawano as President.
|1991||October||Annual revenue reached 32.8 billion yen. Beat previous record.|
|1995||April||The headquarters building is destroyed in Hanshin Awaji earthquake, moved to its current location.|
|1996||December||Mr. Hideo Kawano as Vice Chairmanbr> Mr. Noriyuki Shirai as President.|
|1998||December||Founded HAN-YEI Inc. in Columbus, Ohio with Sakai Chemical Industrial Co.|
|1999||February||Held a ceremony for 50-year anniversary.|
|2002||July||Founded Kohyei-Zipper Hong Kong Ltd. in Hong Kong.|
|December||Yoshihiko Tsuchihashi named President.|
|2003||November||Bought chemical products operations of Yanase & Co., founded Function material division.|
|December||Introduced operating officer system.
Founded Kohyei Trading Hong Kong Ltd. a fully-owned subsidiary.
|2004||February||Founded Kohyei Trading (Shanghai) Co.,Ltd. with Sakai Chemical Industrial Co. in Shanghai, China.|
|2005||November||Restructured the company organization to include autonomous divisions.|
|December||Youichi Miyake as Representative Director./td>|
|2006||July||Restructured Kohyei Kohan Inc., as Kohyei Kohan Co.,Ltd.|
|November||Implemented midterm business plan.
|2007||October||Annual revenue reached 33 billion yen.|
|2009<||February||Celebrated 60th anniversary of foundation.
Issued 60th anniversary commemoration magazine.
Start of second medium-term management plan
|2012||June||Founded THAI KYC CO.,LTD. in Bangkok,Thailand.
|July||Founded PT.KOHYEI INDONESIA in Jakarta,Indonesia.
|November||Started of Third medium-Term Management plan
|December||Founded KOHYEI TRADING(INDIA)PVT.LTD. in Chennai,India by joint investment with POLYHOSE INDIA PVT. LTD.|
|2013||January||Through joint investment with BUENO Technology Co., Ltd., established BUENO KOHYEI CO., LTD. in Taiwan.|
|2014||September||September: Changed trade name of KOHYEI TRADING (INDIA) PVT. LTD. to KOHYEI POLYMERS (INDIA) PVT. LTD.|
|December||Equity participation in Ital Plastic Compounds Private Limited of India|
|2015||November||Start of fourth medium-term management plan|
|2017||February||Began operating Koharakagaku Toryo Co.LTD. as a group company.|