a polymer formed by the reaction between a dibasic acid and a dihydroxy alcohol, both organic, or by the polymerization of a hydroxy carboxylic acid

Thermosetting resins, produced by dissolving unsaturated, generally linear, alkyd resins in a vinyl-type active monomer such as styrene, methyl styrene, and diallyl phthalate. Cure is effected through vinyl polymerization using peroxide catalysts and promoters, or heat, to accelerate the reaction. The resins are usually furnished in solution form, but powdered solids are also available.

Thermosetting plastics of the type used in fiberglass boat hull and automobile body construction.

(textiles) Polyester is a petroleum/oil by-product. It is very strong and easy to wash. It dries quickly and has good shape retention. It is shrink and crease resistant. It is resistant to sunlight, perspiration and moths and has a low absorbency. A light fibre resembling wool or silk, polyester is often blended with natural fibres. It is an ideal fibre for sheeting when mixed with cotton. Dacron is used as a substitute for down in cushions and upholstery.