Synthesis and characterization of hyperbranched alkyd resins based on tall oil fatty acids

Hyperbranched alkyd resins (HBRA) were synthesized from fourth generation hydroxylated hyperbranched polyester (HBP1–4) and tall oil fatty acids (TOFA) using acid catalysis. Different molar ratio of HBP1–4 and TOFA were used. Iodine values increased with the TOFA content. TOFA characteristic –HCCH– bonds were detected in the infrared and nuclear magnetic resonance spectrum. Average molar mass number (Mn) and weight average molar mass (Mw) of the HBRA resins were determined by gel permeation chromatography (GPC). The values increased with the TOFA content. The viscosity of the HBRA resins was between 0.015 and 0.17 Pa s for 0.11 s−1 shear rate. The dynamic light scattering (DLS) analysis revealed that the hydrodynamic dimensions of the HBRA resins are polydisperse. The HBRA resins exhibited excellent adhesion, flexibility, drying time, gloss and chemical resistance.