| 摘要 |
1,216,567. Polybenzimidazoles and precursors. TEIJIN Ltd. 11 Sept., 1968 [11 Sept., 1967; 16 Sept., 1967; 19 Oct., 1967 (2)], No. 43271/68. Heading C3R. Aromatic polyamide-imines at least 50 mole per cent of which are composed of units where Y and Z each independently represent an ortho divalent aromatic group, X and A represent divalent aromatic groups not ortho- or peri-oriented and m is 0 or 1 and any remaining units may have the formula where Q is a divalent aromatic group not ortho- or peri-oriented or an aliphatic or alicyclic group and α and # are H or C 1-3 alkyl may be prepared by reacting in an inert organic liquid medium, which contains or can act as an acid acceptor, (1) an aromatic polyamine optionally mixed with less than 50 mols per cent of a diamine with (2) a dicarbonyl halide A-(COHa) 2 . They may be converted to polybenzimidazoles containing units by thermal or chemical dehydration. Monoamines or monoacid chlorides may be used to regulate molecular weight. Numerous reactants, solvents and acid acceptors are specified. |
