A number of resin copolymers have been synthesized by reacting the semicarbazone derivative of 4-hydroxyacetophenone-furfural-substituted benzoic acids in the presence of an acid catalyst. The structure of the repeat unit of the copolymer has been ascertained from the IR spectrum. The TG analysis of some resin copolymers has been studied. The kinetic parameters of the degradation have been evaluated using five different methods. A plausible mechanism is suggested.