Process for the preparation of polyamidoximes and polybenzimidazole (pbi)type polymers derived therefrom

Abstract

Abstract PROCESS FOR THE PREPARATION OF POLYMERS WHICH COMPRISES REACTING AT TEMPERATURE OF FROM ABOUT 0* TO ABOUT 250*C. AN AROMATIC DIAMINE WITH A BIS(HYDROXAMOYL HALIDE) OR A DERIVATIVE THEREOF TO FORM A POLYAMIDOXIME, WHICH MAY THEN BE SUBJECTED TO RING CLOSING CONDITIONS TO FORM POLYBENZIMIDAZOLE (PBI) TYPE POLYMERS. FORMATION OF THE POLYAMIDOXIME IS PREFERABLY CONDUCTED IN THE PRESENCE OF A SOLVENT, WHICH MAY OR MAY NOT ALSO FUNCTION AS AN ACID-ACCEPTOR, IF NOT, THEN PREFERABLY ALSO IN THE PRESENCE OF AN ACID-ACCEPTOR. THE PREFERRED ACID-ACCEPTORS ARE THOSE WHICH ARE INSOLUBLE IN THE REACTION MIXTUREMOST PREFERABLY MELAMINE. THE RING CLOSURE MAY BE CONDUCTED IN THE PRESENCE OF A CATALYST AT TEMPERATURES OF FROM ABOUT 0* TO ABOUT 250*C OR BY REACTION WITH AN AROMATIC BIS(HYDROXAMOYL HALIDE) REACTANTS ARE MADE BY 0* TO ABOUT 90*C. REACTIVE AMINE OR HYDROXAMOYL HALIDE TERMINAL GROUPS OF THE POLYAMIDOXIMES OR PBI TYPE POLYMERS MAY BE REACTED WITH OTHER COMPOUNDS OR POLYMERS WHICH CONTAIN GROUPS REACTIVE THEREWITH IN ORDER TO FURTHER EXTEND THE POLYMER CHAINS. IN A PREFERRED PRIOR STEP, AROMATIC BIS(HYDROXAMOYL HALIDE) REACTANTS ARE MADE BY THE REACTION OF DIALKYL AROMATIC PRECURSORS, E.G., ANY OF THE ISOMERS OF XYLENE, WITH, E.G., NITROSYL HALIDE. NOVEL POLYAMIDOXIMES.

Inventors

• 👤 C Zellner
• 👤 H Steinman

Bibliographic Details