Copolyamide composition containing reinforcing fibers and having high modulus stability and uses thereof

Abstract

The present invention provides a method for preparing a polymerizable compound having at least two distinct units A and X1Y of the formula A / X1Y, wherein A is: at least one C9-C 18 , preferably C 10 ~C 18 , more preferably C 10 ~C 12 Amino acid, or at least one C9-C 18 , preferably C 10 ~C 18 , more preferably C 10 ~C 12 Lactam or at least one C4-C 36 , preferably C6 to C 18 , preferably C6 to C 12 , more preferably C 10 ~C 12 Diamine Ca and at least one C4-C 36 , preferably C6 to C 18 , preferably C6 to C 12 , more preferably C 10 ~C 12 X1Y is a repeating unit obtained by polycondensation with a dicarboxylic acid Cb; 18 , preferably C 10 ~C 18 , more preferably C 10 ~C 12 and X1Y are repeating units obtained by polycondensation of a linear aliphatic diamine (X1) with at least one aromatic dicarboxylic acid (Y), wherein the copolyamide comprises at least two distinct units A and X1Y, for preparing a composition comprising between 35 and 65% by weight, preferably between 50 and 65% by weight, of reinforcing fibers relative to the total weight of the composition, the flexural or tensile modulus, measured after identical conditioning, not varying by more than 20% within a temperature range of 20°C to 40°C, in particular within a temperature range of 0°C to 40°C, more particularly within a temperature range of -10°C to 40°C.

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