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Patrick BELLIARD: Doctor of Chemistry - Former Director, Synthesis and Applications Laboratories, Structural Resins Department: Cray Valley (Total Group) - Update of [J 5 860] written by Alain ZALMANSKI (PCUK) in 1982 then by Patrick ARLAUD (Cray Valley) in 1994
INTRODUCTION
Unsaturated polyesters are obtained by polycondensation of one or more diacids with one or more diols (or glycols), with at least one of the diacids containing an ethylenic double bond that can subsequently react with a vinyl, acrylic or allylic compound. In practice, most unsaturated polyesters are obtained by polycondensation of mixtures of anhydrides and diol(s).
Although many variations are possible, 80% of unsaturated polyesters on the market are propylene glycol maleophthalates dissolved in styrene. By copolymerization and appropriate processing, they essentially lead to glass/polyester-reinforced plastics, with numerous applications in the building industry and many other industrial sectors.
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Polycondensation of unsaturated polyesters
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Bibliography
Standards and norms
International Organization for Standardization ISO
- Plastics – Compression molding of thermoset specimens - ISO 295 - 2004
- Plastics – Unsaturated polyester resins. Conventional determination of reactivity at 80°C - ISO 584 - 1998
- Plastics – (polyester resins) and paints and varnishes (binders). Determination of partial acid number and total acid number - ISO 2114 - 2000
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France Plastique http://www.france-plastique.com
European Composites Directory http://www.euro-composite.com
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