Bisphenol A diglycidyl ether (DGEBA) is a pale yellow liquid epoxy compound synthesized through the polycondensation of epichlorohydrin (ECH) and bisphenol A (BPA). It serves as a monomer for the synthesis of epoxy resins via bulk polymerization and can also be used as an epoxy resin in its own right. It offers advantages such as excellent color, low epoxy equivalent weight, low organic chlorine content, and low cost. When formulated with various curing agents and fillers, the resulting curable resins have a wide range of applications, including use in various profiles, insulating paints and coatings, adhesives, and encapsulation materials for electronic components such as semiconductors and integrated circuits.

In the industrial synthesis of DGEBA, two main methods are typically employed: the traditional one-step process, where the ring-opening and ring-closing reactions between BPA and ECH occur simultaneously under the influence of an alkali; and the two-step process, which utilizes a catalyst to first form a chlorohydrin ether intermediate from BPA and ECH, followed by the addition of an alkali to remove HCl and yield the glycidyl ether. It is estimated that DGEBA accounts for over 75% of industrial epoxy resins, making it the most widely used base resin. The synthesis of DGEBA (Bisphenol A diglycidyl ether) is described below.

Properties of 2,2-bis(4-glycidyloxyphenyl)propane

Molecular formula: C21H24O4;

Molecular weight: 340.41;

EINECS number: 216-823-5

Melting point 40–44 °C;

boiling point 210 °C / 1

mmHg; density 1.17 g/cm³;

vapor pressure 0 Pa at 25 °C;

refractive index 1.5735;

flash point 264–268 °C.

Form: Viscous liquid;

Color: White.

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