Neopentyl Glycol Diglycidyl Ether (Aliphatic Difunctional Epoxy)

Neopentyl Glycol Diglycidyl Ether (NPGDGE, CAS 17557-23-2) is a difunctional aliphatic reactive diluent and flexibilizing co-resin for epoxy systems. With EEW of 105-115 g/eq and viscosity of 15-30 mPa·s at 25°C, NPGDGE provides more viscosity reduction than mono-functional glycidyl ethers while contributing two reactive epoxy groups per molecule, resulting in less Tg depression per unit of viscosity reduction compared to mono-functional diluents.

The neopentyl backbone imparts flexibility and reduces the crosslink density in a controlled manner, making NPGDGE particularly useful for toughening and flexibilizing epoxy systems in industrial floor coatings, flexible adhesives, and potting compounds where some elastomeric character is beneficial. Unlike rubber-toughening agents, NPGDGE modifies the base network rather than creating a separate phase.

In UV-curable systems, NPGDGE is used as a reactive diluent for both cationic and free-radical hybrid cure systems. The aliphatic ether structure provides better UV resistance than glycidyl ethers based on aromatic alcohols. Primary applications include flexible protective coatings for pipes and concrete, flexibilized construction adhesive systems, flexible electrical potting compounds, and as a diluent-flexibilizer in casting resins for art and craft applications where flexibility after cure is desired.