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An alkyd is a polyester modified by the addition of fatty acids and other components. They are derived from polyols and a dicarboxylic acid or carboxylic acid anhydride. Alkyd coatings have typically three classes based on the oil length in the resin: long, medium and short. Alkyds are used in paints and varnishes. They are the dominant resin or "b..

Unsaturated polyesters are condensation polymers formed by the reaction of polyols with saturated and unsaturated dibasic acids. Polyester resins are used in GRP Pipes, Tanks, Ducts, Sheet Moulding Compound (SMC), Cultured Marble, Marine, Wind Energy, Transport, Building and Construction industries...