LAMINATED MATERIAL PROTECTING CONTENTS FROM OXYGEN, METHOD OF PROTECTION AND PACKAGE USING OXYGEN ABSORBING MATERIAL Russian patent published in 2003 - IPC

FIELD: food industry. SUBSTANCE: invention relates to materials and articles and methods of packing products sensitive to oxygen, especially food products. According to invention, materials include copolyamides containing more than 50% of polyamide segments by weight and segments of oligomer polyolefin in amount providing oxygen absorbing capability. Segments of polyamide are obtained from standard polyamides used in production of bottles and package such as polyhexamethyleneadipamide and polyphthalamides. Copolymers are obtained preferably at ester interchange in process of reactive extrusion and they contain usually about 0.5-12 weight percents of segments of oligomer polyolefin. As compared with similar polyester materials and similar polyamide materials, copolymers used in laminated materials feature improved active and passive oxygen protection properties. Multilayer bottles made of polyamides absorbing oxygen and consisting of approximately 99.8% of polyamide by weight are suitable for recycling together with other bottles made of polyamides. EFFECT: enlarged operating capabilities. 14 cl, 3 tbl, 2 ex, 2 dwg