Coumarone-indene resins (CIR) with carboxy groups were synthesized via cooligomerization of unsaturated compounds presented in light fraction of coal tar and its fraction boiling out within 423–463 K with the addition of such industrial monomers as styrene, maleic anhydride, glycidyl methacrylate and methacrylic acid. 2,2`-Azobis(2-methylpropionitrile) in the form of 0.2 M solution in toluene was used as an initiator. The effect of monomers nature, initiator amount, temperature and reaction time on the yield and characteristics of resulted CIR has been determined. The structure of the synthesized CIR was confirmed by IR-spectroscopy. The conversion of unsaturated compounds during synthesis of CIR with carboxy groups was determined by gas-liquid chromatography.
 Wu, Y., Li, J., Xu, J. et al.: J. Shanghai Univ. Engl. Ed., 2010, 14, 313. https://doi.org/10.1007/s11741-010-0651-3
 Sokolov V.: Indene-Kumaronovye Smoly. Metalurgia, Moskva 1978.
 Pyshyev S., Grytsenko Y., Solodkyy S. et al.: Chem. Chem. Technol., 2015, 9, 359.
 Pyshyev S., Grytsenko Y., Danyliv N. et al.: Petrol. Coal, 2015, 57, 303.
 Pyshyev S., Grytsenko Y., Nikulyshyn I., Gnativ Z.: J. Coal Chem., 2014, 5-6, 41.
 Koliandr L., Andreeva V., Kovaleva N. et al.: Koks i Khimia, 1984, 6, 29.
 Koliandr L., Andreeva V., Kovaleva N. et al.: Koks i Khimia, 1980, 9, 31.
 Pyshyev S., Gunka V., Grytsenko Y., Bratychak M.: Chem. Chem. Technol., 2016, 10, 631.
 Lipatov Yu., Nesterov T.: Spravochnik po Khimii Polimerov. Naukova dumka, Kiev 1971.
 Bratychak M., Zubal O., Bashta B. et al.: Chem. Chem. Technol., 2017, 11, 180. https://doi.org/10.23939/chcht11.02.180
 ASTM- D36/D36M - 14e1. Standard Test Method for Softening Point of Bitumen (Ring-and-Ball Apparatus). https://www.astm.org/Standards/D36.htm