Alkyds - Plastic resins

This plastic was developed in 1926 and was promptly put to work in liquid form as enamels, paints, lacquers, and similar coatings for automotibles, refrigerators, stoves and similar products--still the largest use for alkyds. In 1948, however, an alkyd compound was introduced as a molding material for compression molding electrical applications like circuit breaker insulation, coal forms, capacitor and resistor encapsulation, cases, housings, and switchgear components. Major properties of the alkyds are in the electrical area where alkyd molding materials offer excellent dielectric strength. Alkyds also have excellent heat resistance and are dimensionally stable under high temperatures. Alkyds are thermosetting unsaturated polyester resins produced by reacting an organic alcohol with an organic acid, dissolved in and reacted with unsaturated monomers such as styrene [C 6 H 5 CHCH 2 ], diallyl phthalate [C 6 H 4 (COOCH 2 CHCH 2 ) 2 ], diacetone acrylamide [CH 3 COCH 2 C(CH 3 ) 2 CHCHCONH 2 ] or vinyl toluene [CH 2 CHC 6 H 4 CH 2 ]. Typical applications for alkyds are electrical uses, automotive parts, and as coatings.

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