Optimal conditions for the synthesis of p-arylphenol-amine resin (PAPAR) from pyrolysis condensate and hexamethylenetetramine were found. The PAPAR structure was established by spectral and chemical techniques. The PAPAR properties enhancing the oxidation resistance of petroleum luminophores produced from catalytically cracked heavy gas oil and heavy pyrolysis tar were studied. The mechanism of the PAPAR action during photoirradiation of petroleum luminophores was shown.