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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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