Modified syntheses of Ca-resinates by fusion method

Tall oil rosin was modified with fumaric acid or maleic acid anhydride to g et fortified rosin, which was used as a raw material in fusion Ca-resinate syntheses. Two reaction steps were observed in the syntheses. A fast resina tion reaction takes place at 235 degreesC. A mechanistic model for the deca rboxylation reaction step was derived to explain the effect of fortifying s ubstances on the reaction kinetics. A multivariate calibration method using partial least-square (PLS) regression was applied to monitor the acid conc entration decrease on the basis of infrared spectroscopic data during the f ortified syntheses. A mixture of unmodified rosin and rosin oil (decarboxyl ated rosin) was used as a raw material in a novel modification of fusion sy ntheses to increase the mass yield of the resinate. In the modified rosin o il syntheses, decarboxylation of rosin acids is avoided, and recycling the added rosin oil considerably improves the mass yield of the resinate synthe ses.