Flame-proof polyamides

Flame-proof polyamide materials which can be processed by a thermoplastic method and comprise blends of

• 1. 60-97% by weight of amorphous, partly aromatic polyamide and
• 2. 3-40% by weight of polyphosphonate, the sum of the two components 1 and 2 always being 100% by weight, and wherein the polyphosphonates contain recurring units having the structure ##STR3## wherein R represents an alkyl having 1-6 carbon atoms, cycloalkyl having 5-30 carbon atoms, an alkyl having 7-30 carbon atoms, or an aryl having 6-30 carbon atoms,
• X denotes at least one of phenylene or a radical of the formula ##STR4## wherein n is an integer from 0 to 4, Y is a single bond or a C.sub.1 -C.sub.5 -alkylene, a C.sub.5 -C.sub.12 -cycloalkylene or an S, O, SO.sub.2, CO or C(CH.sub.3).sub.2 bridge member, and the aromatic rings are unsubstituted or substituted with C.sub.1 -C.sub.4 -alkyl groups (A) having up to 4 alkyl groups in each ring.