USE OF COPOLYAMIDES FOR MANUFACTURING COMPOSITIONS THAT REMAIN RIGID UNDER THE EFFECT OF TEMPERATURE

摘要

The invention mainly relates to the use of a semi-crystalline copolyamide having the formula A/X₁Y, where: A is a repeating unit obtained by polycondensation of - at least one C₆- to C₁₈-lactam, or - at least one C₆- to C₁₈-amino acid, or - at least one repeating unit XY obtained by polycondensation of at least one linear aliphatic C₄- to C₁₈-diamine (X) and at least one aliphatic C₆- to C₁₈-dicarboxylic acid (Y); and X₁Y is a repeating unit obtained by polycondensation of at least one cycloaliphatic diamine (X₁) and at least one aliphatic C₆- to C₁₈-dicarboxylic acid (Y), the mass ratio between comonomer A and comonomer X₁Y ranging from 60/40 to 90/10, for preparing objects of which the tensile modulus, measured according to ISO 527, does not vary more than 20% in the temperature range from 20°C to 40°C. The invention further relates to a composition comprising 25 to 65% by weight of said semi-crystalline copolyamide, 35 to 75% by weight of reinforcements, 0 to 10% by weight of at least one impact modifier, 0 to 10% by weight of at least one viscosity modulating agent, 0 to 20% by weight of at least one filler, and 0 to 5% by weight of additives. The invention finally relates to a method for manufacturing said composition and to a molded object obtainable from said composition.