Any group of synthetic resins, which are polycondensation products of dicarboxylic acid with dihydroxy alcohols. They are thus a special type alkyd resin but, unlike other types, are not usually modified with fatty acids or drying oils. The outstanding characteristics of these resin is their ability, where catalyzed to cure or harden at room temperature under little or no pressure most polyester now produced contain ethylenic instauration, generally introduced by unsaturated acid. It is used as reinforced plastic, automobile parts, boat hulls, foams, encapsulation of electrical equipment, magnetic tape, piping bottles etc. The demand for unsaturated polyester resin is ever increasing, because of scarcity the material has to be imported. Polyester resin has very good scope.
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