Haftvermittler für Polyamid-Verbunde, Verfahren zu deren Herstellung sowie deren Verwendung

摘要

An adhesion promoting agent or compatibiliser (I) is based on partially crystalline, high molecular weight block (co)polyester amides (II) prepared by direct esterification of polyamide condensation pre-polymers (III) containing (hydroxy)carboxyl end groups and polyester segments (IV) with hydroxy(carboxyl) end groups. (II) form two crystalline phases and comprise the following segments: (A) at least one (co)polyamide block with a number average molar mass of at least 1000 g/mole; (B) at least one aromatic (co)polyester block with a number average molar mass of at least 1000 g/mole; and (C) at least one diol of formula HO-R-OH (1); (where R = aliphatic or partially aromatic (co)polyester, aliphatic polyether, aliphatic (co)polyester amide, polycarbonate or aliphatic or aromatic hydrocarbon). Also claimed are: (i) the preparation of (I); (ii) multi-layer polymer hoses or tubes, optionally having at least one concertina section, comprising (co)polyamide and (co)polyester inner and outer layers bonded together by a layer of (I) with barrier properties; and (iii) multi-layer thermoplastic composites comprising at least one (co)polyamide layer, at least one (co)polyester layer and at least one intermediate layer of (I). Preferably (A) comprise monomers chosen from lactam, 6-12C alpha , omega -aminocarboxylic acids and 2-44C dicarboxylic acids, preferably 2-12C or 36-44C dicarboxylic acids, and/or they comprise monomers chosen from 2-12C aliphatic dicarboxylic acids, 6-14C aromatic dicarboxylic acids and 2-12C (cyclo)aliphatic diamines. (A) are preferably polyamides containing lactam, especially lactam-12.(B) comprise monomers chosen from aromatic dicarboxylic acids or dicarboxylic acid diesters (preferably terephthalic acid, isophthalic acid or 2,6-naphthalene dicarboxylic acid, or their dimethyl ethers) and 2-12C diols (preferably ethylene glycol, butane diol, hexane diol or cyclohexane dimethanol), preferably polyethylene terephthalate (PET) or polybutylene terephthalate (PBT). Most preferably (A) is polyamide 12 (PA 12) and (B) is PBT.