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Unsaturated Polyester Resins |
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| Unsaturated polyester resins are the third-largest class of thermoset molding resins. The polyesters are low molecular weight viscous liquids dissolved in vinyl monomers like styrene to facilitate molding or shaping of the resin into a desired form before curing to rigid solids. Typical applications are in fiberglass-reinforced shower stalls, boat hulls, truck caps and airfoils, construction panels, and autobody parts and trim. Mineral-filled UPRs are used in synthetic marble countertops and autobody putty. Unfilled UPRs are used in gel coats and maintenance coatings. Adi-pure® adipic acid improves tensile and flexural strength in these resins and, at high levels, can give soft, pliable products for specialty applications. 1 Alkyd resins, a common type of unsaturated polyester resin, utilize adipic acid where low viscosity and high flexibility are valued in plasticizer applications. |
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| UPR resins are mainly aromatic polyesters. Flexibility of UPR is increased by replacing a portion of aromatic acid with Adi-pure® adipic acid. A cure site monomer, like maleic anhydride, is incorporated to provide unsaturation within the polymer backbone. Crosslinking is by free radical addition polymerization of styrene monomer/diluent. |
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