Hyperbranched copolyamide, composition based on said hyperbranched copolyamide and method for obtaining same

• Main Authors: BOUQUEREL FRANCK, SASSI JEAN-FRANCOIS
• Format: Patent
• Language: English
• Published: 29.03.2005
• Edition: 7
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

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.