Use of semi-aromatic polyamides in mixtures of aliphatic polyamides containing circular cross-section glass fibers to limit warpage

摘要

The invention relates to -C6 to C12 lactams, -C6 to C12 amino acids, and -C4 to C18 aliphatic diamines (X), in particular from C4, in order to limit the warpage of the composition during processing, in particular by injection or compression molding. At least one aliphatic polyamide A obtained from polycondensation of units selected from C12 and C6 to C18 aliphatic dicarboxylic acids (Y), in particular XY units obtained from polycondensation of C6 to C12, circular cross-section glass fibers and Meta-xylylenediamine (MXD) of C6 to C18 aliphatic (Z) dicarboxylic acids, especially C6 to C12, in a mixture optionally containing at least one impact modifier and / or at least one additive. ) Using at least one MXDZ polyamide obtained from polycondensation of MXDZ polyamide and said mixture The composition constituted, MXDZ / A weight ratio of 0.11 from 0.83, 0.66, especially from 0.11, to the use. [Selection figure] None