Hydrogenated copolymers of vinyltoluene and alfamethylstyrene, and copolymer of pcresol and divinylbenzene, in the form of a solution in n,ndimethylacetamide containing by weight 50 % or more of polymer, produced by chemical synthesis, in primary forms
Polymer and prepolymer plastics produced by chemical synthesis, n.e.s., in primary forms (excl. copolymer of pcresol and divinylbenzene in the form of a solution in n,ndimethylacetamide containing by weight > 50% of polymer, hydrogenated copolymers of vinyltoluene and alfamethylstyrene, and poly(1,3phenylene methylphosphonate))