Mitsubishi Electric Develops Insulating Epoxy Resin with 40% Biomass Content

Mitsubishi Electric Corporation has developed a new insulating epoxy resin containing over 40% biomass components, achieving high heat resistance and flowability. Conventional biomass epoxy resins were limited to 20-30% biomass content because increasing the ratio typically compromised these properties. The new resin achieves 40%+ biomass content by using a 100% biomass epoxy compound for part of the main agent and a ~70% biomass monomer additive. Controlling the curing process forms a semi-interpenetrating polymer network (Semi-IPN) structure, suppressing molecular motion at high temperatures to achieve a glass transition temperature (Tg) of 180°C or higher. Additionally, using a liquid main agent and low-viscosity additive ensures the flowability required for casting and sealing. This resin remains processable when combined with general fillers, making it viable for industrial use. Mitsubishi Electric plans to apply this eco-friendly material to its products, such as motors, to support decarbonization across power and electronic equipment supply chains.