Company history

Toyobo begins with a financing problem solved unusually well. Japan’s government-run spinning mills of the 1870s were small because nobody could assemble the capital for anything larger. In May 1882 Shibusawa Eiichi did exactly that, gathering the idle wealth of the dissolved feudal aristocracy — the Maeda, Mori, Tokugawa and Date houses among them, some 38% of the subscribers — into a joint-stock company. The Osaka Spinning Mill opened its Sangenya works in July 1883 with 15,000 spindles, more than seven times the scale of a state mill.

Scale was only half the design. Steam power let the mill run around the clock, and the combination of size and continuous operation gave it a cost position no rival could match. The workforce went from 293 in 1883 to 1,073 in the fourth year and 10,950 by 1909. The demonstration mattered more than the profit: private capital, not the state, could make spinning a commercial industry.

On Shibusawa’s advice a second company, Mie Spinning, was founded at Yokkaichi in 1886 on the same template, and the two grew in parallel, bound by shared investors and a shared idea of management. In June 1914 they merged as equals to form Toyo Spinning Co., Ltd. (Toyobo) — 440,000 spindles, 28,000 bales of yarn, capital of ¥14.25 million, and first place in the industry ahead of Kanegafuchi Spinning. Cotton yarn was prewar Japan’s export economy, and Toyobo now sat at the top of it.

From 1919 Toyobo stopped being a cotton-yarn specialist. It moved — directly or through affiliates — into silk, rayon, staple fibre, tyre cord, knits, lace, thread, wool, rubber, heavy cloth and pulp, and it grew by absorbing rivals: Ise Spinning in 1923, Nagoya Silk Spinning in 1926, Osaka Godo Spinning in 1931, Showa Rayon in 1934, and a rush of eleven more through 1941–42, fifteen companies in all. At its prewar peak it ran 66 plants and 1.95 million cotton spindles, with some 100 affiliated companies outside Japan — the largest textile group in the world.

Cotton spinning was also the first industry to recover from the war, and Toyobo recovered fastest. It absorbed Toyo Dyeing in 1949 and listed its shares the same year, opened Toyobo New York in 1951, built a new mill at Hamamatsu in 1952 and set up Toyobo do Brasil in 1955. Riding the Korean War boom, the year to April 1951 produced sales of $95.8M (¥35bn) and profit of $16.9M (¥6bn) on capital of about $3.9M (¥1bn), and a 48% dividend — the best result of any company in Japan.

That summit was also the moment the ground shifted. In 1954 Britain’s Imperial Chemical Industries formally offered Toyobo a polyester licence, and Toyobo declined. Terephthalic acid meant building a chemical plant, and the board could not convince itself that polyester had a clothing market worth that irreversible outlay. In 1956 it took an acrylic licence from American Cyanamid instead and concentrated there. Teijin and Toyo Rayon took the ICI deal.

The consequence of 1954 arrived as a structural handicap, not a delay. Toyobo did not start polyester until 1964, eight years behind, and by then the leaders held the advantage in yield, in customers and in feedstock contracts. Polyester went on to become the largest synthetic fibre in the world. A 1961 trade appraisal put it bluntly: the company that had taken the industry’s top rank from Kanebo before the war had sunk, against the rise of Toyo Rayon, to “about the rank of a komusubi” in sumo terms.

The 1966 merger with Kureha Spinning was the attempt to buy back the lost years — what Toyobo actually wanted was Kureha’s nylon plant. President Taniguchi Toyosaburo argued that holding “nylon, polyester, acrylic and polypropylene, all of them” was the way to meet the coming age of blended fibres, and pointed to Manchester, where British textiles had consolidated into ICI and Courtaulds, as the shape Japan would inevitably take. What followed was not consolidation but four decades of contraction. A 1974 report from the Mie plant caught the mood — workers clocking in at five in the morning to find the machines still and spending the day weeding: “Anxious if I go, anxious if I stay; but if I’m going to cut my losses, it had better be now.” Hamamatsu and Suzuka closed in 1984, Ako and Tadaoka in 1994, Ise and Omachi in 1999, Komatsushima, Fuchizaki and Miyagi in 2003 — roughly one round every five years. A single decision to leave textiles was never taken; it was deferred, plant by plant.

What did work was a different move entirely. In March 1968, with the Inuyama pulp mill running at 45 to 80 tonnes a day against a break-even of 300, Toyobo chose not to close it but to convert it — same site, same people, new product. Biaxially oriented polyester film followed in 1971, nylon film in 1976, and the stretching technology accumulated there became the company’s most valuable asset. Around it grew plastics, reverse-osmosis membranes, enzymes and pharmaceuticals; when founder-centenary president Uno Osamu pushed non-textile diversification hard in 1982, this was the ground he built on. By 2002 the trade press was calling Toyobo a non-textile company in all but name, and in October 2012 the name went too: Toyo Spinning became Toyobo Co., Ltd., dropping the character for “spinning” after 130 years.

The film technology begun at Inuyama in 1968 paid off half a century later. In 2013 Toyobo commercialised Cosmoshine SRF, a super-birefringent film for polariser protection that resists the warping which plagued triacetyl-cellulose film as LCD panels grew past 40 inches. Panel makers in Japan and abroad adopted it, and by 2024 it held roughly 60% of the world market for polariser protection film in LCD televisions — the profit engine of the whole company.

Concentration that sharp is also a fragility. Packaging film, a commodity business sitting in the same segment, could not pass through the energy, freight and labour cost surge that began in 2022, and film segment operating profit collapsed from $180.4M (¥20bn) to $12.2M (¥2bn) in the year to March 2023. The company’s answer in 2025 was to lean further into the strong side — expanding SRF capacity at Tsuruga and converting existing lines to industrial film.

Two reckonings shadowed the transition. From 2005 the U.S. Department of Justice sued over Zylon, the high-strength fibre used in body armour, alleging that Toyobo had not disclosed how far its protective performance degraded with age; the litigation ran more than ten years before a settlement charged as an extraordinary loss of about $62.4M (¥7bn) in March 2018. Then in 2021 came the disclosure that a UL certification irregularity had been concealed four separate times over a decade. In April 2022, with a quality assurance division newly created above the business units, Toyobo split its textile operations out of the parent into a subsidiary — ending roughly 140 years in which textiles had been the core of the company itself, and completing in corporate form a shift that the business had already made.