Patent ID: 8334359

Claim:
A modified polyamide comprising a polyamide modified by a compound comprising at least one aromatic hydroxyl group chemically bonded to the chain of the polymer, wherein the polyamide is produced by polymerization starting from at least the following monomers: i) A1) a difunctional hydroxyaromatic compound comprising two functional groups, wherein the two functional groups can react with an amine functional group, and wherein the compound A1) is a compound of following formula (I): (HO) x —Z—(COOH) 2 (I) in which Z is a polyvalent, at least trivalent, aromatic or arylaliphatic hydrocarbon radical and x is between 1 and 10; and ii) at least one polyamide monomer selected from the group consisting of: B) a dicarboxylic acid compound which is B1), an aliphatic or cycloaliphatic or arylaliphatic diacid, and C) an aliphatic, cycloaliphatic or arylaliphatic diamine, and D) a lactam or an amino acid, optionally one which is aliphatic; where when the monomer B is solely of the B1) type, the molar proportion of monomer A1) with respect to the monomers A1) and B) is between 0.1% and 30%.