Synthesis of phenolformaldehyde oligomers, engrafted with sunflower-seed, soy-been oils and products of their transformation – the remainder of their industry (soap stock), or products of their oxidation (oxidated oils) has been carried out. Physico-chemical properties of synthesized oligomers have been studied, their structure has been determined by means of modern physical methods of investigation (NMR- and IR-spectroscopy)