Teijin Launches High-performance Microporous Membrane

Tokyo, Japan, July 2, 2015 ---Teijin Limited announced today that it has launched a new business based on the company’s high-performance microporous membrane production technology, MIRAIM.

Miraim's logo

MIRAIM offers high permeability, substance support and preferential segregation properties. It combines coating and multi-stratification technologies in a high-precision thin-film uniform-pore-diameter membrane made of polyethylene or/and aramid. It enables once-unattainable customer needs to be unmet flexibly through small-lot design and production.

The pore diameter can be adjusted from 20nm (polyethylene version) to 3μm. At 3μm, moisture-permeable waterproofing is superior to that of nonwoven filters. Porosity of between 40% and 90% can be adjusted. Membrane thicknesses from 4μm to 200μm are possible, ensuring high-volume solution at equivalent thickness by high-strength polyethylene membrane. MIRAIM’s particle filling ratio is up to 90% of its polyethylene weight ratio. Specialized functions, including flexible heat-resistance, adhesive and hydrophilic properties, are unprecedented for polyethylene membranes.


MIRAIM is suitable for applications including liquid filters for particulate removal and polishing cushion sheets for electronics, and electronics parts except separator substrates taking advantage of its waterproof moisture-permeability. Teijin has developed applicable multiple substrates, coating resins and dispersed particle technologies, and is developing composite technologies to further meet customers’ demands.

Teijin is integrating group businesses and materials to develop new applications by overlapping high-performance materials and health care, for example, technologies and knowhow for foreign-body filters and cell culture medium sheets. Combined sales of JPY 20 billion are targeted for LIELSORT separators and MIRAIM membranes by 2020.

Since launching its polyethylene membrane business in 2002, Teijin has been developing production technologies for microporous membranes and dispersion techniques for inorganic particles to membrane for electronics applications. In 2007, Teijin developed its meta-aramid Teijinconex porous membrane coated highly heat-resistant separator. It also established a production and distribution base in South Korea. The company has been expanding its separator business since launching the LIELSORT brand in October 2011.

About the Teijin Group
Teijin (TSE: 3401) is a technology-driven global group offering advanced solutions in the areas of sustainable transportation, information and electronics, safety and protection, environment and energy, and healthcare. Its main fields of operation are high-performance fibers such as aramid, carbon fibers & composites, healthcare, films, resin & plastic processing, polyester fibers, products converting and IT. The group has some 150 companies and around 16,000 employees spread out over 20 countries worldwide. It posted consolidated sales of JPY786.2 billion (USD 6.6 billion) and total assets of JPY 823.7 billion (USD 6.9 billion) in the fiscal year ending March 31, 2015.
Press Contact
Corporate Communications
Teijin Limited
+81 3 3506 4055

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It is subject to change without prior notice.