The reaction of 1,4-butanediol diglycidyl ether (EP) with cis-1,2-cyclohexanedicarboxylic anhydride (CH) and triethylamine (TEA) as an initiator was studied with temperature scanning Brillouin spectroscopy (TSBS) and differential scanning calorimetry (DSC). The evolution of the reaction process (liquid-gel-solid) was investigated as a function of the epoxy molar fraction (x(EP),), for sample compositions varying from an epoxy excess to an anhydride excess. The dependence of the final conversion factors alphar(DSC) and alphar(TSBS) and the kinetic parameters E-DSC and E-TSBS on x(E1), is presented. A comparison of the experimental gelation point (Pgel) behavior and the expected theoretical one, described by the Flory theory, is also reported.