1974 success in developing hollow-fiber membranes.
A researcher investigated a phenomenon occurred in a factory under a microscope, wherein a prepared polypropylene material was opaque, and where numerous pores were found on the wall surface of straw-like hollow fibers. The researcher was curious on the potential application of this porous hollow fibers in membrane filters; thus, the researcher conducted research on the fibers. In 1974, the researcher succeeded in developing a hollow-fiber membrane filter, which became the foundation of our products.
Development of the world’s first hollow-fiber membrane-based artificial lung device (1978).
From the discovery of opaque hollow fibers and development of hollow-fiber membrane filters, Mitsubishi Rayon proposed the application of these filters to various industries. These included wastewater treatment and medical care, where the highest levels of functionality and safety are required. In collaboration with a medical equipment manufacturer, Mitsubishi Rayon developed the first hollow-fiber membrane-based artificial lung device, in 1978. Thereafter, the production of polyethylene hollow-fiber membranes without using organic solvents was developed. Eventually, we branched out to the business of medical water treatment, including full scale dialyzers and hand wash stations.