A series of unsaturated polyester resin (UPRs) based on propylene glycol, diethylene glycol, Phthalic anhydride, maleic anhydride with different composition ratio were prepared by polycondensation reaction. Physico-mechanical properties including viscosity, hardness, acid number, gel and peak time are strongly dependent on the content of maleic anhydride in UPR. As increasing the content of maleic anhydride, physico-mechanical properties increased. The obtained UPR was stable for more than 6 months.
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