Aromatic hydrocarbon resins are chemically manufactured from resin oil that contains various monomers. The end product is combination of the following chemicals: indene (20-25%), methlinenes(5-15%), vinyltoluenes(15-25%) and a-methylstyrene (up to 5%). They are based on aromatic feedstocks that do not undertake much refinement prior to the above polymerisation process.
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