Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1991-01-08
1993-03-16
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524399, 524400, 524413, 525370, 25218633, 25218828, C08K 556, C08C 1942, C02F 170
Patent
active
051944782
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a polymer composition adapted for increasing the durability of goods contained in a sealed package, and to a method of producing said composition and to a method of use of said composition.
BACKGROUND
In filled and sealed packages a head-space is provided which is filled with a gas which generally contains oxygen. If the packages are filled with products which are susceptible to oxygen, i.e. which consists of or contain components able to react with oxygen changing the properties or the character of the product, it is important for the contents of the packages to be subjected to the oxygen present in said gas filled space to the least possible extent. In particular, in the case of packages containing dry products susceptible to oxygen, for example, coffee, spices, pharmaceutical preparations in the form of powders or tablets, etc. the ratio between the volume of said head-space (and consequently the amount of oxygen) and the product is often relatively great. Thus, in such cases it is especially desirable to provide a means by which the amount of oxygen present in said head-space can be reduced or eliminated in a simple way which does not interfere with the products contained in the packages. Such means will, of course, also react with oxygen entering the head-space after the package has been sealed, for example, if the package is opened and resealed, or if the package is manufactured of a material which is permeable to oxygen, for example, plastic or paper/cardboard.
An object of the invention is to provide a composition which can be placed into operative association with the head-space of a sealed package so that the product contained in the package will not be affected by the presence of oxygen in the head-space.
In accordance with the invention the composition is effective to reduce or eliminate oxygen present in said head-space. In further accordance with the invention, the composition is placed in a permeable cover, such as a net, a bag or the like, which is included in the package. Especially, the composition is introduced in said gas filled space, i.e. as a rule said head space.
SUMMARY OF THE INVENTION
The invention is based on the finding that certain metal complexes, especially of transition metals, have the capacity to bond with oxygen, and in this way eliminate molecular oxygen from said space, and in the utilization of this effect in connection with polymers.
The polymers comprise thermoplastic resins and especially polyamides and copolyamides, the latter comprising copolymers of polyamides and other polymers. The polyamides can be aromatic and aliphatic, for example poly-m-xylylene-adipamide or nylon 6.6. A preferred group of polyamides are MX nylons. These are polymers containing at last 70 mol % of structural units obtained from m-xylylenediamine alone or a xylylenediamine mixture containing m-xylylene-diamine and p-xylylenediamine in an amount of less than 30% of the total amount and an .alpha...omega.-aliphatic dicarboxylic acid having 6-10 carbon atoms.
Examples of these polymers include the homopolymers such as poly-m-xylylene adipamide, poly-m-xylylene sebacamide and poly-m-xylylene speramide, copolymers such as m-xylylene/p-xylylene adipamide copolymer, m-xylylene/p-xylylene pyperamide copolymer and m-xylylene/p-xylylene azelamide copolymer, and copolymers of these homopolymer or copolymer components and aliphatic diamines such as hexamethylenediamine, cyclic diamines such as piperazine, aromatic diamines such as p-bis(2-aminoethyl)benzene, aromatic dicarboxylic acids such as terephthalic acid, lactams such as .epsilon.-caprolactam, .omega.-aminocarboxylic acids such as .omega.-amino-heptoic acid and aromatic aminocarboxylic acids such as p-aminobenzoic acid.
In these MX nylons there may be incorporated polymers such as nylon 6, nylon 66, nylon 610 and nylon 11.
The invention will be explained hereafter in connection with polyamides but it is not limited thereto.
The effect of the polymer composition according to the inve
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Chemical Abstracts, vol. 91, (1979) Abstract No. 58055s, Jpn. Kokai Tokkyo Koho 79 38,287.
Frandsen Erik
Mazzone Rolando
A/S Haustrup Plastic
A/S Haustrup PLM Holding
Michl Paul R.
Szekely Peter
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