Barrier material resisting to humidity and to transformation by stretching and/or thermomoulding

摘要

Polyamides comprise, per 100 moles of monomers, (i) 40-67 moles, preferably 46-62 moles PA-6, I, (ii) 30-45 moles, preferably 30-42 moles PA-6,T, and (iii) 0-20 moles, preferably 6-12 moles PA-6,6, having a level of crystallinity ( c) of at least 5%, preferably at least 8%, measured by X-ray diffraction in the large angle area. Preferably the polymer is prepared from hexamethylene diamine, iso- and terephthalic acids, and optionally adipic acid. It may also contain up to 5% of other polyamide monomers, such as 1,4-diamino cyclohexane, caprolactam, dodecalactam, octamethylene diamine, decamethylene diamine, dodecamethylene diamine, 1,5-diamino hexane, 2,2,4-trimethyl 1,6-diamino hexane, piperazine, 3,3'-dimethyl 4,4'-diamino dicyclohexyl methane, 4,4'-diamino dicyclohexyl methane, 2,2'-(4,4'-diamino dicyclohexyl methane) propane, isophorone diamine, azelaic acid, sebacic acid, and dodecandioic acid. Preferably its level of di(6-amino hexyl) amine is below 1.5 mole %.