History
1947
Yasuhara Yushi Kogyo
(Kōnu Town, Kōnu District,
Hiroshima Prefecture – now Miyoshi City)
Began production of terpenes, rosin, and pine tar
1949
Established the Mesaki Plant
(Closed in 2008)
1959
Incorporated as Yasuhara Yushi Kogyo
(Head office: Mesaki-cho, Fuchu City, Hiroshima)
1960
Established the Sendai Plant
(Closed in 2018)
1961
Established the Takagi Plant
(Closed in 2020)
1962
Opened Tokyo Branch Office
(now Tokyo Office)
Opened Tokyo Branch Office (now Tokyo Office)
1966
Began production of “Hirodine”
hot-melt adhesives at Mesaki Plant
Established Hirodine Kogyo Co., Ltd. as an
affiliated company
Transferred hot-melt adhesive business
from Yasuhara Yushi Kogyo
1967
Relocated head office to Takagi-cho,
Fuchu City, Hiroshima
1969
Opened Osaka Sales Office
(Integrated into Tokyo Office in 2023)
1972
Established Research Laboratory at Takagi Plant
1977
Established YS Co., Ltd. as an affiliated company
(Commercial division of Yasuhara Yushi Kogyo
and Hirodine Kogyo)
1980
Renamed YS Co., Ltd. to Hirodine Co., Ltd.
1981
Established Soryo Plant (Hirodine Kogyo)
(Integrated into Ukai Plant in 2023)
1984
Established Niihama Plant
1989
Renamed to Yasuhara Chemical Co., Ltd.
1995
Listed on the Hiroshima Stock Exchange
(Merged with Tokyo Stock Exchange in 2000)
1996
Listed on the Second Section of the Osaka Stock Exchange
(Delisted in 2003)
1997
Merged with Hirodine Kogyo Co., Ltd.
1999
Established Ukai Plant
2000
Listed on the Second Section of the Tokyo Stock Exchange
2005
Merged with Hirodine Co., Ltd.
2007
Established Fukuyama Plant
2010
Established Research Laboratory at Fukuyama Plant
2017
Integrated Takagi Plant into Fukuyama Plant and renamed it
Fukuyama Plant Takagi Site
2022
Transitioned to the Tokyo Stock Exchange Standard Market