HYPERBRANCHED COPOLYAMIDE, PROCESS FOR ITS PRODUCTION, ITS USES AND COMPOSITIONS BASED ON SAID HYPERBRANCHED COPOLYAMIDE

摘要

The invention relates to hyperbranched copolyamides (HBPAs), to their production and to their use as additives, in particular as melt viscosity modifiers in thermoplastic polymer compositions.This copolyamide is obtained by a reaction between a monomer (I): A-R-Bfwith A and B=polymerization functions of a 1st and 2nd type, respectively, which are capable of reacting with each other, R=hydrocarbon-based species and f=total number of B per monomer (preferably 2<=f<=10); and a monomer (II) A'-R'-B' or the corresponding lactams, with A', B' and R' having the same definition as that given above for A, B and R, respectively. This HBPA has a I/II molar ratio such that 0.125<=I/II≤2.One of the species R or R' of (I) or (II) is aliphatic, cycloaliphatic or arylaliphatic.For example: A=NH2 and B=COOH or A=COOH and B=NH2 with F=2.A'=NH2 and B'=COOH or A'=COOH and B'=NH2.A-R-B2, e.g.: 5-aminoisophthalic acid or 3,5-diaminobenzoic acid and A'-R'-B'=epsilon-caprolactam.The yarns, fibres, films and moulded parts obtained using polymer compositions (e.g. PA) to which are added HBPA according to the invention are also included in this invention.