Polyamide-imides by condsn of diimide diacyl chlorides and diamines - in two-phase water-solvent systems

摘要

Polyamide-imides are made by polycondenses. of diimide diacyl chlorides (A) of formula, with (B) aromatic o- p- or m-substd. diamines of formula (in which X1 and X2 are CH2, O, SO2 or CO), in a strongly-stirred dispersion of water and an immiscible liq. inert to (A) and which does not dissolve the prod. Used to prodn. of high-temp. resistant articles by high-pressure sintering of powder, of films, wire lacquers, adhesives, laminate pre-pregs., filaments or fibres, from solns. in dimethyl acetamide or N-methyl pyrrolidone. The reaction medium gives fine powders with high bulk density, good solubility in polar solvents and good moulding props.