Composition including a copolyamide and a cross-linked polyolefin

摘要

The invention relates to a composition including: 45 to 95 wt % of a semi-aromatic copolyamide containing at least two separate units having the following general formulation: A/X.T, where A is selected from among a unit obtained from an amino acid, a unit obtained from a lactam, and a unit having the formula (diamine Ca).(diacid in Cb), and XT denotes a unit obtained from the polycondensation of a diamine in Cx and from terephthalic acid, with x being the number of carbon atoms of the diamine in Cx, said copolyamide having a polymoleoularity index, noted Ip, of less than or equal to 3.5, measured by gel permeation chromatography, and an amino chain end content of between 0.020 meg/g and 0.058 meg/g; and 5 to 55 wt % of at least one cross-linked polyolefin. The invention also relates to a method for preparing said composition and to the uses thereof.

主权项

1. A composition comprising:
from 45% to 95% by weight, relative to the total weight of the composition, of a semiaromatic copolyamide comprising at least two different units corresponding to the formula:
A/X.T, in whichA is a unit obtained from an amino acid, a unit obtained from a lactam or a unit corresponding to the formula (Ca diamine).(Cb diacid), with a representing the number of carbon atoms in the diamine and b representing the number of carbon atoms in the diacid, a and b each being between 4 and 36;X.T denotes a unit obtained from the polycondensation of a Cx diamine and from terephthalic acid, with x representing the number of carbon atoms in the Cx diamine, x being between 4 and 36,said copolyamide having a polydispersity index, noted as Ip, of less than or equal to 3.5, measured by gel permeation chromatography,said copolyamide having a content of amine chain ends of between 0.020 meq/g and 0.058 meq/g; and a content of acid chain ends between 0.015 and less than or equal to 0.100 meq/g, from 5% to 55% by weight, relative to the total weight of the composition, of at least one crosslinked polyolefin being in the form of a phase dispersed in the matrix formed by the copolyamide A/X.T, said dispersed phase produced by reaction in molten phase of a product (A) comprising polymers containing ethylene and an unsaturated epoxide, the weight proportion of product (A) being between 2% and 15% by weight relative to the total weight of the composition, of a product (B) comprising a copolymer of ethylene and of an unsaturated carboxylic acid anhydride, or a polyolefin grafted with an unsaturated carboxylic acid anhydride, the weight proportion of product (B) being between 3% and 40% by weight, relative to the total weight of the composition, and optionally of a product (C) comprising a copolymer of ethylene and of an unsaturated carboxylic acid, or an α,ω-aminocarboxylic acid the weight proportion of product (C) being between 0 and 12% by weight, relative to the total weight of the composition.