Corporate History
| 1984 | Tonen General Sekiyu Group | Company begins research into micro-perforated film (microporous membranes) |
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| 1988 | Construction of battery separator film (BSF) pilot plant (Kawasaki, Kanagawa Prefecture) |
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| 1990 | Tonen Chemical Nasu Co., Ltd. established (Nasu-Shiobara, Tochigi Prefecture) |
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| 1991 | BSF used in the world's first commercialized lithium-ion secondary battery |
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| 1993 | Construction of plant for BSF semi-mass production (Kawasaki, Kanagawa Prefecture) |
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| 1997 | Operations start at BSF mass production plant (Nasu-Shiobara, Tochigi Prefecture) |
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| 2007 | Tonen Specialty Separator Godo Kaisha established (Nasu-Shiobara, Tochigi Prefecture) BSF business merged with the company through a corporate spin-off |
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| 2008 | Tonen Specialty Separator Korea Limited established (Gumi, Gyeongsangbuk-do) |
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| 2009 | Operations begin at new production facility in South Korea (Gumi, Gyeongangbuk-do) |
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| 2010 | With an investment from Toray Industries, Inc., BSF business begins operating as Toray Tonen Specialty Separator Godo Kaisha and Toray Tonen Specialty Separator Korea Limited |
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| 2011 | Company announces expansion of BSF manufacturing facility in South Korea (Gumi, Gyeongangbuk-do) |
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| 2012 | With the return (repayment) of TonenGeneral Sekiyu Group's 50% stake, the companies began operating as Toray Battery Separator Film Godo Kaisha (100% owned by Toray) and Toray Battery Separator Film Korea Limited (100% owned by Toray Battery Separator Film Godo Kaisha). |
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| Toray Battery Separator Film Godo Kaisha was reorganized as Toray Battery Separator Film Co., Ltd. | ||
| 2017 | Toray Industries, Inc. absorbed Toray Battery Separator Film Co., Ltd. effective April 1, 2017. Toray Battery Separator Film Korea Limited and Toray BSF Coating Korea Limited remain as wholly owned consolidated subsidiaries in Korea. |
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