High-viscosity polyamide composition

摘要

A high-viscosity polyamide composition including a branched polyamide is described. Also described, is a relationship between a high-viscosity polyamide composition and a composition including a copolyamide of a statistical tree type resulting from a reaction between a multifunctional monomer including at least three reactive functions in order to form an amide function. Further described, are three reactive functions of two different types and bifunctional monomers used in the manufacture of linear polyamides. A resulting copolyamide can have a very low melt flow index relative to the linear polyamide and improved impact resistance properties. Lastly, use of such a composition for extrusion blow-molding articles is described.

主权项

1. A composition obtained by blending at least:
a) one copolyamide having a random tree structure, which results from a reaction between at least:
one polyfunctional monomer corresponding to a general formula I:
(AR1)—R—(R2B)n  (I) in which: n is an integer between 2 and 10 (limits included), R1 and R2 can be identical or different and represent a covalent bond or an aliphatic, arylaliphatic, aromatic or alkylaromatic hydrocarbon radical, R is a linear or branched aliphatic radical, a substituted or unsubstituted cycloaliphatic radical, a substituted or unsubstituted aromatic radical which can comprise several aromatic rings and/or heteroketones, A represents an amine or amine salt functional group or an acid, ester, acid halide or amide functional group, and B represents another amine or amine salt functional group, when A represents an acid, ester, acid halide or amide functional group, and an acid, ester, acid halide or amide functional group, when A represents an amine or amine salt functional group,
at least one bifunctional monomer of following formula II to IV:
A1-R3-A1  (II)B1-R4-B1  (III)andA1-R5-B1 or the corresponding lactams  (IV)with optionally at least one monofunctional monomer of formula V or formula VI:
R6-B1  (V),andR7-A1  (VI)in which: A1 and B1 respectively represent an acid, ester or acid chloride functional group and an amine or amine salt functional group and R3, R4, R5, R6 and R7 represent linear or branched alkyl hydrocarbon radicals, substituted or unsubstituted aromatic hydrocarbon radicals or alkylaryl, arylalkyl or cycloaliphatic hydrocarbon radicals which can comprise unsaturations; and b) one chain extender.