Rosin derivatization

The derivatization of rosin focuses on the carboxyl group and the double bonds. Double bond reactions such as isomerization, hydrogenation, dehydrogenation, polymerization, and Diels-Alder adduction are typically carried out. Reactions of the carboxyl group include salt formation, esterification, hydrogenolysis, ammonolysis, and decarboxylation. Fig. 3 is a schematic or rosin derivatization carried out by one manufacturer, Hercules Inc. 

Extraction of rosin. Rosin resins are produced from three types of rosin, i.e. gum, tall oil, and wood. Extensive details about rosin resins extraction and derivatization can be found on page 269 in the book edited by Zinkel and Russell [18]. 

One important factor influencing the solubility of rosin derivatives is its tendency to crystallize. Initially, a rosin product may appear to be soluble in a given solvent, but on standing, the rosin will crystallize out of soluble solution. This tendency of rosin to ciystallize can be overcome by derivatization, mainly esterification. 

They are obtained from the derivatization of rosin or by polymerization of petroleum distillates, turpentine fractions, coal tar and pure monomers. 

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