Polyester resins, unsaturated

Unsaturated Polyester Resins. Unsaturated polyester resins are widely used as fiber-reinforced plastics, coating materials, tire cords, films, and casting or molding resins. Organic titanates such as TYZOR TPT, TYZOR TBT, or TYZOR TOT can be used to catalyze the preparation of the resins, which involves the polyesterification of a mixture of a- and p-unsaturated polybasic acids, such as maleic or fumade acid, and alicydic polybasic acids, such as adipic or isophthalic acid with polyhydroxyalcohols (489). 

Polyester resin, unsaturated. See Polyester resin, thermosetting... 

Synonyms Polyester resin, unsaturated Polyester, unsaturated Unsaturated polyester resin UPR... 

Plastic Construction Ltd, 281 Plastizising, 2, 5, 253 Plastics Processing Industries Training Board, PPITB, 13, 19 Polybutadiene, 222 Polycarbonate, 5, 37, 38, 40, 57 Polychloroprene, 222 Polyester resins, unsaturated, 161 in HST, 191... 

Unsaturated Polyester Resins. Unsaturated polyester resins based on DCPD are produced by reacting glycols, maleic anhydride, and DCPD (12). There are at least four different methods (12,53) in making the DCPD-based polyesters. They are usually two-step batch processes. In one commonly used method, the glycol and maleic anhydride are first allowed to react at a temperature below 150°C, typically aroimd 130°C. Then DCPD is added to the mixture and the reactor temperature is gradually raised to 200°C. After an acid number between 30 and 40 is obtained, the polyester is allowed to cool and is diluted with a mixture of styrene and inhibitors. 

Used as fibres, particularly in textiles and film. Many other polyester polymers are of importance, e.g. unsaturated polyester resins from phthalic anhydride, propylene glycol and maleic anhydride used with reinforcement in boats, cars, etc. (alkyd resins). U.S. production 1983 1-7 megatonnes. 

Organic peroxides are used extensively for the curing of unsaturated polyester resins and the polymerization of monomers having vinyl unsaturation. The —O—O— bond is split into free radicals which can initiate polymerization or cross-linking of various monomers or polymers. 

Alkyds are formulated from polyester resins, cross-linking monomers, and fillers of mineral or glass. The unsaturated polyester resins used for thermosetting alkyds are the reaction products of polyfunctional organic alcohols (glycols) and dibasic organic acids. 

ALCOHOLS,HIGHERALIPHATIC - SURVEY AND NATURALALCOHOLSMANUFACTURE] (Voll) Unsaturated polyester resins... 

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