Multi-layer polyamide-based packaging casing

polyamide-based biaxially stretch-oriented multi-layer tubular packaging casing for packaging pasty products, having a wall thickness of about 30 to 60 microns, wherein said casing includes a barrier layer with reduced oxygen permeability, an outer layer disposed on a first surface of said barrier layer, and an inner layer disposed on a second surface of said barrier layer,

• said barrier layer comprising a polymer admixture, therein 30 to 95% by weight, relative to the weight of the polymer admixture of the barrier layer is at least one of a saturated linear aliphatic polyamide or saturated linear aliphatic copolyamide;
• in admixture with at least one polymer selected from the group consisting of a partially-aromatic polyamide and a partially-aromatic copolyamide,
• wherein said partially aromatic polyamide or partially aromatic copolyamide consists essentially of, in a first embodiment,
• diamine units, of which at least 95 mole-% are aromatic and, optionally up to 5 mole-% aliphatic, and dicarboxylic acid units, of which at leas 95 mole-% are aliphatic and, optionally, up to 5 mole-% are aromatic or,
• in a second embodiment,
• b) diamine units, of which least 95 mol % are aliphatic and, optionally, up to 5 mole-% are aromatic, and dicarboxylic acid units, of which at least 95 mole-% are aromatic and, optionally, up to 5 mole-% are aliphatic,
• and said outer and inner layers comprising a material selected from the group consisting of a saturated aliphatic polyamide, a saturated aliphatic copolyamide and a first polymer mixture which includes at least one saturated aliphatic polyamide or saturated aliphatic copolyamide,
• wherein said casing is formed by coextruding the polymers forming the individual layers through an annular die.