Mitsui Chemicals Inc (Mitsui Chemicals) manufactures chemicals including basic chemicals, petrochemicals, functional polymeric materials, polyurethane, fabricated products, and functional chemicals. The company serves various industries including healthcare, mobility, ICT, and basic and green materials. Mitsui Chemicals offers a diverse portfolio of products and services including vision care materials, nonwoven fabrics, oral care materials, personal care materials, agricultural chemicals, elastomers, functional compounds, polypropylene compounds, semiconductor and electronic component process materials, optical materials, lithium-ion battery materials, next-generation battery materials, high-performance food packaging materials, ethylene, propylene, polyethylene, polypropylene, catalysts, phenols, purified terephthalic acid, PET resins, polyurethane materials, and industrial chemicals.

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Mitsui Chemicals’ R&D policy and strategy are focused on addressing diverse social challenges, including those related to the global environment, resources, energy, and food. The company's R&D strategy is based on four foundations: Functions, Organizations, Technologies, and Human Resources. The company conducts research aimed at resolving social challenges based on its technological strengths. It also conducts research from a long-term perspective, envisioning the future and identifying challenges by back-casting from the envisioned future. The company's R&D Center conducts activities aimed at creating business opportunities, new functions, profit generation, and sustainability. The company also continually refines its core technologies and makes efforts to acquire and incubate new technologies. The R&D units of Mitsui Chemicals include the Synthetic Chemicals Laboratory, Polymers and Composite Materials Laboratory, Process Technology Laboratory, R&D Planning and Coordination Division, Mobility Development Center, Mitsui Chemicals Singapore R&D Center, Innovative Solutions Center for Information and Communication Technology, and Frontier Technology Center. These units are responsible for various aspects of the company's R&D activities, including research on synthetic technologies, polymer and composite materials, production technologies, R&D planning and coordination, mobility solutions, ICT solutions, and future technologies. In FY2025, the company spent JPY45,781 million towards its R&D activities, which accounted for 2.5% of total revenue, and grew 2.4% YoY. As of March 2025, the company had three laboratories, four centers, and one planning and coordination division for its R&D activities.