What is the key reason Mitsui Chemicals is expanding its MR resin production capacity again, and when is the new equipment expected to start operating?

Mitsui Chemicals is expanding its MR resin production capacity again due to strong demand from the Chinese and U.S. markets; the new equipment at its Ōmuta plant in Fukuoka Prefecture, Japan, is expected to begin operation in the first half of 2029.

What are the defining properties and applications of Mitsui Chemicals' MR resin, and why is it strategically important to the company?

MR resin is a liquid-state material that cures into eyeglass lenses and is distinguished by its high refractive index, enabling thinner and lighter lenses; it is a core product of Mitsui Chemicals’ healthcare business—a designated key growth area—and the company holds the world’s top global market share for this material, with operations extending into lens coating and processing equipment.

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Mitsui Chemicals Expands Eyeglass Lens Material Production Capacity

Jun 10, 2026

Mitsui Chemicals plans to expand MR resin eyeglass lens production at its Omuta plant, with new equipment running by mid-2029. The move targets strong demand in China and the US, maintaining its global market leadership.

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