Epoxy resins are thermosetting polymers widely used owing to the excellent mechanical properties, superior chemical and heat resistance, and strong adhesive qualities they provide. They find use in a variety of applications ranging from construction to automotive to electronics. In applications such as electronics, epoxy resins are used as potting, encapsulation, coating, and adhesive materials. In these applications, specialty grades of epoxy resins are necessary to achieve the level of purity, reliability, clarity, and flexibility required. Mitsubishi Chemical Group offers jER™ epoxy resins to help manufacturers and formulators for electronics achieve the degree of quality necessary for success. 

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jER™ Specialty Epoxy Resins 

Listed below are five categories of jER™ specialty epoxy resins, designed to cover a breadth of end-use applications pertaining to electronics.
 

• Low melt viscosity, crystalline epoxy resins 
• High-purity liquid epoxy resins 
• Transparent, light-resistant epoxy resins 
• Soft and flexible epoxy resins 
• High–molecular weight epoxy resins 

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Low Melt Viscosity, Crystalline Epoxy Resins 

This class of jER™ resin provides higher reliability in applications such as epoxy molding compounds, copper clad laminates, solder masks, powder coatings, and FRP. Here, the low melt viscosity allows for better flow properties that help with mold and shape filling, filler and fiber wetting, and film formation and coverage. jER™ YX4000 is recommended for these benefits. 

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High-Purity Liquid Epoxy Resins 

In applications such as potting and encapsulation, electronic assembly adhesives, and liquid mold compounds, the halogen content of raw materials is critical to manage to prevent corrosion, dendritic growth, and electrochemical migration, all of which can reduce the lifespan of the electronic component. Grades such as jER™ YL980, jER™ 1750, and jER™ YL983U are recommended here, with some containing total chlorine in concentrations as low as 300 ppm. 

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Transparent, Light-Resistant Epoxy Resins 

These epoxy resins provide excellent transparency after full cure, facilitate easier photo curing, and offer better heat and UV resistance. These properties are important for applications such as LED/OLED encapsulation, adhesives used in optical device manufacturing, and photocured compounds. jER™ YX8000D and jER™ YX8040 resins provide these characteristics. 

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Soft, Flexible Epoxy Resins 

In recent times, flexible electronics have increased in demand, necessitating materials such as adhesives to provide good durability and bond strength during flexure. jER™ YX7105, jER™ YX7110, and jER™ 7400N are epoxy resins designed to provide a high degree of elastic modulus, tensile strength, and elongation to provide resilience in adhesive formulations used in flexible electronics. 

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High–Molecular Weight Epoxy Resins 

For applications using epoxy resins that require higher toughness while improving durability for flexible applications, jER™ 1256 and jER™ 4250 can be used as additives. They improve film formation, toughness, and flexibility and reduce embrittlement in applications such as paints and coatings, composites, thermoplastics, and resin-coated copper. These additives may also be used as viscosity modifiers in various formulations containing epoxies. 

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Summary of jER™ Epoxy Resins for Specialty Applications 

ChemPoint is the authorized distributor of jER™ epoxy resins. Do you have an application similar to any of the above? Click below to speak to one of our formulating experts to discuss your formulation and receive samples.