Aromatic polyol end-capped unsaturated polyetherester resins and resin compositions containing the same having improved chemical and/or water resistance

A process for making an unsaturated polyetherester resin useful for making curable thermoset resin compositions comprising reacting at least one acid-terminated unsaturated polyetherester resin with at least one aromatic polyol having at least one non-primary hydroxy group to produce an unsaturated polyetherester resin at least partially end-capped with an aromatic polyol;

• wherein the at least one aromatic polyol is represented by the formula
• wherein Ar1, Ar2 and Ar3 each independently represents an aromatic group;
• R1, R2, and R3 each independently represents a non-aromatic predominantly hydrocarbyl group;
• each X and X′ independently represents a hydrocarbylene group, a hydrocarbylidene group a divalent hetero atom or group, an ester linkage, or a combination thereof;
• each X can also represent a covalent bond, h and k each independently represent an integer equal to 0 or 1;
• j represents an integer in the range from 0 to 5;
• and m, n, and p each independently represent an integer in the range from 1 to 5, provided that at least one hydroxy group of formula (I) is a nonprimary hydroxy group.