Mitsubishi Rayon was founded in 1933 as Japan’s first rayon staple manufacturer. Mitsubishi Rayon started the acrylic resin business, its current core business, in the 1940s, and now has the world’s leading market share for acrylic resin materials. Further, applying its polymer technology gained from synthetic fiber and synthetic resin, Mitsubishi Rayon’s business, including its hollow fiber membranes, carbon fibers, and other products, helps to improve the aquatic environment, reduce CO2 emissions, and conserve energy.