US 6,872,459 B1 · Laminated packaging material and method for producing the same

Abstract

This invention relates to the laminated material for food packaging, and its manufacturing process. The laminated material (10) consists of the quality keeping intermediate layer (12) laminated inside the paper core layer (11) and the core layer and the heat sealable innermost layer (13). The quality keeping intermediate layer comprises of an extrusion coatable blend polymer consisting of polymer component A 50-95% of nylon-MXD6 or EVOH and, polymer component B 5-50% of nylon 6, nylon 6, the blends or PET. The quality keeping intermediate layer is extruded and laminated directly in the core layer, the innermost layer contains at least the linear low density polyethylene which has a narrow molecular weight distribution, and has the properties parameter of mean density of 0.910-0.925, 100-122 degrees C. peak melting point, melt flow index of 5-20, swelling ratio (SR) of 1.4-1.6, and 5-50 micrometer layer thickness. The hardness, production efficiency, and cost performance of the barrier packaging container formed by the packaging material are improved.

Claims11

Dependent claims

A laminated material for food packaging which comprises;

at least a paper core layer;
a quality keeping intermediate layer;
and
a heat sealable innermost layer;
the quality keeping intermediate layer comprising an extrusion coatable blend polymer containing 50-95% of polymer component A of condensation polymer (nylon-MXD6) of meta-xylene diamine and abipic acid or ethylene vinyl alcohol copolymer (EVOH), 5-50% of polymer component B of nylon-6 (PA-6), nylon-66 (PA-66), blend (PA-6/66) with nylon-6 and nylon-66 or polyethylene terephthalate (PET);
the quality keeping intermediate layer being immediately adjacent the core layer;
and
the innermost layer consisting of a blend of metallocene LLDPE and linear low density polyethylene which blend has a narrow molecular weight distribution, and has a mean density of 0.910-0.925, a 100-122 degrees C. peak melting point, a melt flow index of 5-20, a swelling ratio (SR) of 1.4-1.6, and a 5-50-micrometer layer thickness and which is a thin layer of 6-12 g/m2 of the blend.

5 more elements

A method of manufacturing a laminated material for food packaging which comprises at least a paper core layer, a quality keeping intermediate layer laminated inside the core layer and a heat sealable innermost layer, the method comprising:

extrusion-coating directly on the core layer the quality keeping intermediate layer comprised of a blend polymer of polymer component A 50-95% of condensation polymer (nylon-MXD6) of meta-xylene diamine and abipic acid and, polymer component B 5-50% of nylon-6 (PA-6) or nylon-66 (PA-66) or a blend (PA-6/66) with nylon-6 and nylon-66 to laminate the quality keeping intermediate layer to the core layer;
and
coextruding a heat sealable polymer forming the heat sealable innermost layer simultaneously with said blend polymer or extruding the heat sealable polymer after the extrusion coating of the blend polymer to laminate the heat sealable innermost layer;
the heat sealable polymer consisting of a blend of metallocene LLDPE and linear low density polyethylene which blend has a narrow molecular weight distribution, and has a mean density of 0.910-0.925, a 100-122 degree C. peak melting point, a melt flow index of 5-20, a swelling ratio (SR) of 1.4-1.6, and a 5-35-micrometer layer thickness.

1 more element

Dependencies are inferred from the claim text.

Laminated packaging material and method for producing the same

Life of this patent

Laminated packaging material and method for producing the same

Life of this patent

Abstract

Claims11