Overview
ABSTRACT
Unsaturated polyesters are obtained by the polycondensation of one or several diacids with one or several diols (or glycols), with at least one diacide containing an ethylenic double bond with the capability to react at a later stage on a vinyl, acrylic or allyl compound. In practice, most unsaturated polymers are obtained by the polycondensation of mixtures of anhydride and diol(s). Although numerous variants are possible, 80% of commercialized unsaturated polyesters are propylene glycol maleophtalates in solution in the styrene. Through copolymerization and an appropriate implementation they essentially lead to the production of reinforced plastics glass/polyester, which have numerous applications in construction as well as in many other industrial sectors.
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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 poyesters
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