3911 Petroleum resins, coumarone-indene resins, polyterpenes, polysulphides, polysulphones and other polymers and prepolymers produced by chemical synthesis, n.e.s., in primary forms

3911 (01/1988-..) Petroleum resins, coumarone-indene resins, polyterpenes, polysulphides, polysulphones and other polymers and prepolymers produced by chemical synthesis, n.e.s., in primary forms 39111000 (01/1988-..) Petroleum resins, coumarone, indene or coumarone-indene resins and polyterpenes, in primary forms 39112000 (01/2022-..) Poly(1,3-phenylene methylphosphonate), in primary forms 39119010 (01/1988-12/1996) Condensation or rearrangement polymerization products, whether or not chemically modified, n.e.s., in primary forms 39119011 (01/1997-..) Poly`oxy-1,4-phenylenesulphonyl-1,4-phenyleneoxy-1,4-phenyleneisopropylidene-1,4-phenylene` in blocks of irregular shape, lumps, powders, granules, flakes and similar bulk forms, whether or not chemically modified 39119013 (01/1997-..) Poly`thio-1,4-phenylene`, whether or not chemically modified, in primary forms 39119019 (01/1997-..) Condensation or rearrangement polymerization products, whether or not chemically modified, n.e.s., in primary forms (excl. poly`oxy-1,4-phenylenesulphonyl-1,4-phenyleneoxy-1,4-phenyleneisopropylidene-1,4-phenylene` in blocks of irregular shape, lumps, powders, granules, flakes and similar bulk forms and poly`thio-1,4-phenylene) 39119090 (01/1988-12/1996) Polymer and prepolymer plastics produced by chemical synthesis, n.e.s., in primary forms 39119091 (01/1997-12/2009) Copolymer of p-cresol and divinylbenzene, in the form of a solution in N, N-dimethylacetamide, containing by weight >= 50% of polymer, produced by chemical synthesis 39119092 (01/2010-..) Hydrogenated copolymers of vinyltoluene and alfa-methylstyrene, and copolymer of p-cresol and divinylbenzene, in the form of a solution in N, N-dimethylacetamide containing by weight 50 % or more of polymer, produced by chemical synthesis, in primary forms 39119093 (01/1997-12/2009) Hydrogenated copolymers of vinyltoluene and alfa-methylstyrene, produced by chemical synthesis, in primary forms 39119099 (01/2022-..) Polymer and prepolymer plastics produced by chemical synthesis, n.e.s., in primary forms (excl. copolymer of p-cresol and divinylbenzene in the form of a solution in N, N-dimethylacetamide containing by weight >= 50% of polymer and hydrogenated copolymers of vinyltoluene and alfa-methylstyrene)