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Polyester resin is synthetic resin made from polyhydric alcohol and a polybasic acid or anhydride and often dispersed in monomer. They are differentiated in two types.
01. Unsaturated Polyester Resin:
An unsaturated polyester made by condensation between polyhydric alcohol and a polybasic acid or anhydride which must include an unsaturated acid or anhydride and may also contain some monobasic acid. In practice, such polyester is dissolved in an unsaturated monomer such as a styrene and immediately before use an activator and an accelerator are added. The composition reacts to form a bard tough film, no loss of solvent by evaporation being necessary.
02. Saturated Polyester Resin:
A condensation product of saturated polybasic acids or anhydrides with polyols and may also contain monobasic acid.