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
Poli (oksi-1, 4-fenilensulfonil-1, 4-fenilenoksi-1, 4-fenilenizopropiliden-1, 4-fenilen)