Packaging container

Details Packaging container Packaging container

2001-09-28

2003-07-08

Dye, Rena (Department: 3627)

Stock material or miscellaneous articles

Hollow or container type article

Nonself-supporting tubular film or bag

C428S035700, C428S035900, C428S036600, C428S036700, C428S458000, C428S461000, C428S474400, C428S474700, C428S476100, C428S476900, C428S480000, C428S483000, C383S908000, C053S428000, C053S432000, C053S440000, C264S291000

Reexamination Certificate

active

06589616

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to a packaging container made from a cold formed composite, a process for its manufacture and the use thereof.
1. Field of the Invention
It is known to employ packaging means for the purpose of protecting, e.g., pharmaceutical products, medical aids, diagnostic aids and other products which are sensitive to light, gas and/or moisture. Particularly suitable types of packaging are shaped forms of packaging made by stretching, stretch drawing, or deepening. In order to make packaging impermeable to light, gas and vapors, the material from which the packaging is made must have a barrier layer. A particularly suitable barrier layer may be, e.g., a metal foil or metal strip. In practice, as the metal foil alone is not able to fulfill all of the requirements made of a packaging material, further layers—in particular layers of plastic—are applied to one or both sides of the metal foil. Such layers may, e.g., be extrusion bonded or layers in the form of films of thermoplastics attached by means of adhesive agents. With such multilayer laminates readily formable packaging materials are produced that can be processed further, e.g., into the base parts of blister packs or other forms of packaging.
It has now been found that none of the laminates which have found use in practice exhibit sufficient flatness and/or stiffness for further processing after being shaped into packaging forms or parts such as the base part of packaging. It has also been found that laminates which exhibit inadequate flatness and/or stiffness, after shaping into parts for packaging such as base parts for blister packs or push-through packs, result in shaped parts that also exhibit inadequate flatness and/or stiffness. By flatness is meant here that the laminate exhibits a tendency to roll or parts formed out of the laminate are domed and e.g. do not lie uniformly on a flat surface, but instead are curved in a wavy, arched or dome-like manner.
2. Broad Description of the Invention
The object of the present invention is therefore to propose a packaging container which is manufactured out of a composite and the packaging container exhibits a high degree of flatness and/or stiffness.
That objective is achieved by way of the invention in that the composite from which the packaging container or parts thereof is/are manufactured exhibits a layered structure containing:
a) a plastic film having a thickness of 10 &mgr;m to 250 &mgr;m,
b) a biaxially or uniaxially stretched film of the polyvinylchloride, polyolefin, polyamide or polyester type having a thickness of 10 to 100 &mgr;m, or a biaxially or uniaxially stretched plastic laminate of two films of the polyvinylchloride, polyolefin, polyamide or polyester type each having a thickness of 10 to 50 &mgr;m,
c) a metal foil having a thickness of 20 to 200 &mgr;m, and
a
1
) a plastic film having a thickness of 10 to 250 &mgr;m,
and the packaging container exhibits a high degree of flatness and/or stiffness.
Usefully, according to the present invention packaging containers, or parts thereof, exhibit a laminate which features between layer
c), the metal foil having a thickness of 20 to 200 &mgr;m, and
a
1
) the plastic film having a thickness of 10 to 250 &mgr;m,
a layer
b
1
) a biaxially or uniaxially stretched film of the polyvinylchloride, polyolefin, polyamide or polyester type having a thickness of 10 to 100 &mgr;m, or a biaxially or uniaxially stretched plastic laminate of two films of the polyvinylchloride, polyolefin, polyamide or polyester type each having a thickness of 10 to 50 &mgr;m.
DETAILED DESCRIPTION OF THE INVENTION
In practice layer a) is on the side of the container facing outwards, while layer a
1
) forms the side of the container facing inwards i.e. the inner face.
The plastic films a) and a
1
) may e.g. be of thermoplastics such as halogen-containing polymers, polyesters, polyolefins, polyamides or acrylnitrile copolymers. The plastic films a) and a
1
) may preferably be non-stretched or if desired uniaxially or biaxially stretched.
The layers b) and b
1
) are biaxially or uniaxially stretched plastic films. Usefully, the plastic films b) and b
1
) are of the uniaxially stretched polyvinylchloride or uniaxially or biaxially stretched polyamide, polypropylene and polyester film type or laminates.
Examples of plastics a), b), a
1
) and b
1
) based on halogen-containing polymers are polymers of vinylchloride (PVC) and vinyl plastics, containing vinylchloride units in their structure, such as copolymers of vinylchloride and vinylesters of aliphatic acids, copolymers of vinylchloride and esters of acrylic or methacrylic acids or acrylnitrile, copolymers of diene compounds and unsaturated dicarboxyl acids or their anhydrides, copolymers of vinylchloride and vinylchloride with unsaturated aldehydes, ketones etc. or polymers and copolymers of vinylidenchloride with vinylchloride or other polymerizable compounds. The vinyl-based thermoplastics may also be made soft in a conventional manner by means of primary or secondary softeners. Films out of PVC may in some cases also be uniaxially (oPVC) or biaxially stretched.
If the plastic films a), b), a
1
), and b
1
) are of polyesters (PET-films), then examples of the polyesters are polyalkylene-terephthalate or polyalkylene-isophthalate with alkylene groups or radicals with 2 to 10 carbon atoms or alkylene groups with 2 to 10 C atoms interrupted by at least one —O— atom, such as, polyethylene-terephthalate, polypropylene-terephthalate, polybutylene-terephthalate (polytetramethylene-terephthalate), polydecamethylene-terephthalate, poly-1,4-cyclohexyldimethylol-terephthalate or polyethylene-2,6-naphthalene-dicarboxylate or mixed polymers of polyalkylene-terephthalate and polyalkylene-isophthalate, where the fraction of isophthalate amount, e.g., to 1 to 10 mol. %, mixed polymers and terpolymers, also block polymers and grafted modifications of the above mentioned materials. Preferred are polyethylene-terephthalate films. Other useful polyesters are known in the field by the abbreviation PEN.
Other polyesters are copolymers of terephthalic acid and a further polycarboxyl acid with at least one glycol. Useful thereby are the copolymers of terephthalic acid, ethyleneglycol and an additional glycol. Preferred are glycol-modified polyesters known in the field as PETG.
Useful polyesters are polyalkylene-terephthalates with alkylene groups or radicals with 2 to 10 carbon atoms and polyalkylene-terephthalates with alkylene groups or radicals with 2 to 10 carbon atoms which are interrupted by one or two —O— atoms.
Further preferred polyesters are polyalkylene-terephthalates with alkylene groups or radicals with 2 to 4 carbon atoms and, very highly preferred, polyethyleneterephthalates belonging to which are also A-PET, PETP and the above mentioned PETG or G-PET.
Examples of polyolefins for plastic films a), b), a
1
) and/or b
1
) are polyethylenes (PE) e.g. high density polyethylene (HDPE, density larger than 0.944 g/cm
3
, medium density polyethylene (MDPE, density 0.926-0.940 g/cm
3
), linear polyethylene of medium density (LMDPE, density 0.926.0.940 g/cm
3
), low density polyethylene (LDPE, density 0.910-0.925 g/cm
3
) and linear low density polyethylene (LLDPE, density 0.916-0.925 g/cm
3
), for example as non oriented (PE film) or uniaxially or biaxially oriented films, (oPE film), polypropylenes (PP), such as axially or biaxially oriented polypropylene (oPP film) or cast polypropylene (cPP film), amorphous or crystalline polypropylene or mixtures thereof, ataktic or isotaktic polypropylene or mixtures thereof, poly-1-butene, poly-3-methylbutene, poly-4-methylpententene and copolymers thereof, then polyethylene with vinylacetate, vinylalcohol, acrylic acid etc. such as e.g. ionomeric resins, such as copolymers of ethylene with 11% acrylic acid, methacrylic acid, acrylic esters, tetrafluorethylene or polypropylene, also statistical copolymers, block polymers or olefin polymer-elastomer mixtures. Preferred are high density polyethylenes and polypropylenes, also ionomers, e.g. kn

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