Hyperbranched copolyamide, composition based on said hyperbranched copolyamide and method for obtaining same
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United States of America Patent
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Mar 29, 2005
Grant Date -
N/A
app pub date -
Jun 18, 2002
filing date -
May 5, 1999
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Abstract
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--B.sub.f with 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.ltoreq.f.ltoreq.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.ltoreq.I/II.ltoreq.2. One of the species R or R' of (I) or (II) is aliphatic, cycloaliphatic or arylaliphatic. For example: A=NH.sub.2 and B=COOH or A=COOH and B=NH.sub.2 with F=2. A'=NH.sub.2 and B'=COOH or A'=COOH and B'=NH.sub.2. A--R--B.sub.2, 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.
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