POLYAMIDE AND POLYOLEFIN BLENDS WITH A POLYAMIDE MATRIX AND CONTAINING NANOFILLERS IN WHICH THE POLYAMIDE FORMS MATRIX

摘要

PURPOSE: Provided are blends of polyamide and polyolefin containing nanofillers in which the polyamide forms the matrix, compositions with barrier properties which are the blends of polyamide and polyolefin, structures with barrier properties comprising at least one layer of the blends and optionally at least one layer of another material, and the use of the structures for producing a barrier effect. CONSTITUTION: The composition having barrier properties comprises a blend of polyamide (A) and polyolefin (B), wherein the blend contains nanofillers and the polyamide forms the matrix, wherein the polyolefin (B) comprises (i) a high density polyethylene (HDPE) and (ii) a blend of a polyethylene (C1) and a polymer (C2) chosen from elastomers, very low-density polyethylenes and copolymers of ethylene, the (C1)+(C2) blend being cografted with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, wherein the polyolefin (B) comprises (i) a high-density polyethylene (HDPE), (ii) a polymer (C2) chosen from elastomers, very low-density polyethylenes and the copolymers of ethylene (C2) being grafted with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, and (iii) a polymer (C'2) chosen from elastomers, very low-density polyethylenes and copolymers of ethylene, wherein the polyolefin (B) comprises (i) polypropylene and (ii) a polyolefin which results from the reaction of a polyamide (C4) with a copolymer (C3) comprising propylene and a grafted or copolymerized unsaturated monomer X, wherein the polyolefin (B) comprises (i) a polyethylene of the ethylene vinyl acetate (EVA), linear low density polyethylene (LLDPE), very low density polyethylene (VLDPE) or metallocene polyethylene and (ii) an ethylene-alkyl (meth)acrylate-maleic anhydride copolymer, wherein the polyolefin comprises two functionalized polymers comprising at least 50 mol.% of ethylene units and reacting to form a crosslinked phase, and wherein the proportion of nanofillers is between 0.1 and 50 parts per respectively 100 parts of the blend of (A) and (B).