… Petroleum resins, coumarone-indene resins, polyterpenes, polysulphides, polysulphones and other products specified in Note 3 to this Chapter, not elsewhere specified or included, in primary forms. …
Explanatory notes
… 39.11 ‑ Petroleum resins, coumarone-indene resins, polyterpenes, … by polymerising more or less impure fractions obtained, respectively, from deeply cracked petroleum distillates, … in the polymer chain, for example, the product obtained by reacting the sodium salt of bisphenol A …