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Polyester is a type of man made material. It is not a raw material. It is also a great insulator. It is a synthetic polymer made of purified terephthalic acid (PTA) or its dimethyl ester dimethyl terephthalate (DMT) and monoethylene glycol (MEG). With 18% market share of all plastic materials produced, it ranges third after polyethylene (33.5%)  and polypropylene (19.5%
Polyester can be made into thread or yarn. Polyester fabrics are often used to make clothes and home furnishings. These include shirts, pants, jackets, hats, bed sheets, blankets, and upholstered furniture. Polyester fiber is used as cushioning and insulating material in pillows, comforters and upholstery padding. It can be used in curtains to insulate windows and keep heat indoors. Polyester is used to make insulating carpet.
Industrial polyester fibers, yarns and ropes are used in tires, fabrics for their use, and safety belts.
Polyester is a type of polymer that contain the ester functional group in the main chain. There are many different polyesters. The term "polyester" as a specific material most often refers to polyethylene terephthalate (PET). Polyesters include chemicals found in nature, such as in the cutin of plant cuticles, as well as synthetics through step-growth polymerization such as polycarbonate and polybutyrate. Natural polyesters and a few synthetic ones are biodegradable. But most synthetic polyesters are not biodegradeable.
Most polyesters are made with a polycondensation reaction. See "condensation reactions in polymer chemistry". The general equation for the reaction of a diol with a diacid is :
- (n+1) R(OH)2 + n R´(COOH)2 → HO[ROOCR´COO]nROH + 2n H2O
- Rosato, Dominick V.; Rosato, Donald V.; Rosato, Matthew V. (2004), Plastic product material and process selection handbook, Elsevier, p. 85, , http://books.google.com/?id=Lqk5QgGoWFkC