Polymer composition, the production and further processing...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...

Reexamination Certificate

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C206S524200, C206S524300, C206S524400, C206S524900, C264S176100, C264S209100, C264S211200, C521S047000, C521S048000, C524S330000, C524S333000, C524S339000, C524S341000, C604S265000

Reexamination Certificate

active

06610763

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a polymer composition, to a corresponding master batch, to the preparation of this polymer composition or of this master batch, to the further processing of this polymer composition or of this master batch into containers, such as storage or transportation containers as well as disposal containers, and also to the use of phenols for the protection of the container contents in materials containing plastic, particularly in disposal containers made thereof.
BACKGROUND OF THE INVENTION
U.S. Pat. No. 3,075,940 relates to a sterically hindered phenol, especially in the form of a halogenated dihydroxydiphenyl methane (see middle of column 3), which serves to stabilize soft PVC (claim 1).
According to its set of claims, GB-A 1,511,495 relates to the use of 0.1% to 3% by weight of a special halogenated dihydroxydiphenyl sulfide as a stabilizer for polymers selected from polypropylene or other polyolefins, PVC or ABS. The stabilizer cited in that document is explicitly excluded from our application for protection, particularly since this British patent only provides for the use of the stabilizer as an antioxidant or as an agent to de-activate metal in the plastic mixture.
DE-A 196 51 445 relates to the use of bisphenols, as monomers for the preparation of polycarbonate polycyclene, as can be seen in formula VII on page 4, lines 38 through 66. This document does not provide specific information as to whether and bow much of these monomers are still to be found in the polymers in the end.
According to its main claim, EP-B 112,542 relates to polyamide molding compounds containing, relative to the polyamide, 0.5% to 15% by weight of at least one monophenol.
U.S. Pat. No. 5,367,025 relates to a cross-linkable composition containing polyethylene that can be further processed, for example, into containers, and that, in addition to polyolefins, also contains a cross-linking agent in the form of an organic peroxide initiator, at least 0.2% by weight of a polyalkylene benzene polycarbonate as well as, relative to 100 parts of the ethylene polymer, 0.2 to 2 parts by weight of a suitable cross-linking co-reagent, whereby this compound is selected from among sterically hindered phenol antioxidants whereby, however, exclusively non-halogenated antioxidants are cited in column 4, lines 52 through 64.
According to its main claim, U.S. Pat. No. 5,298,540 relates to a process to stabilize recycled mixtures of thermoplastic polymers, whereby this mixture contains 55% to 75% by weight of polyolefins, 5% to 25% by weight of polystyrene, 5% to 15% by weight of PVC and up to 10% by weight of other plastic polymers, whereby this mixture is put into contact with a combination of at least one sterically hindered phenol and at least one phosphite or phosphonite. The exclusively sterically hindered phenols cited in the patent have a characteristic halogen-free tert-butyl phenol group, as can be seen in column 3, top.
Ullmanns Enzyklopädie der technischen Chemie [Ullmann's Encyclopedia of Industrial Chemistry], 3
rd
edition, Volume 5, page 757, describes the use of polyvalent phenols of the type defined in claim 1, but without indicating that they are a component of a polymer composition.
Ullmann's Encyclopedia of Industrial Chemistry, 5
th
edition, Volume A3, also describes the class of hindered phenols in the passage about antioxidants; Table 3, however, does not show any representatives of a halogenated dihydroxydiphenyl methane, dihydroxydiphenyl sulfide or dihydroxydiphenyl ether.
It is common practice to use phenols as disinfectants, that is to say, in order to destroy pathogens as well as to protect plants, materials and food products against microbial attack. This is normally done in that the disinfectant withdraws water from the material to be protected, de-natures protein and brings about other protein changes, while other disinfectants block metabolic processes in the interior of the cells. The class of halogenated dihydroxydiphenyl methanes, dihydroxydiphenyl sulfides and dihydroxydiphenyl that are of particular interest here are employed especially as an additive for deodorizing and anti-bacterial soaps, body lotions and cleansers. In most cases, such substrates have melting points well above 100° C. [212° F.]. Particularly under the designation Irgasan® DP 300, Ciba-Geigy of Basel, Switzerland offers an anti-microbial agent for use in cosmetic preparations, and this agent is 2,4,4′-trichloro-2′-hydroxydiphenyl ether or 5-chloro-2-(2,4-dichlorophenoxy)-phenol or triclosan (INN). In addition lo its classical use in cosmetics, this product is also employed in conjunction with medications and medical products, particularly in the dental sector. Another widespread form of use consists in providing textile fibers and plastics with an anti-microbial finish, and this product also serves as an additive to prevent microbial contamination of water, aqueous solutions or air in technical installations such as, for instance, air-conditioning systems.
Moreover, it is known from Ullmanns Enzyklopaädie der technischen Chemie [UlImann's Encyclopedia of Industrial Chemistry], 5
th
edition, Volume 21, 1985. page 46 ff., that plastics themselves are not attacked by microorganisms. However, it would be advantageous to avoid contamination and the spread of microorganisms in re-useable containers that are meant to store food products or organic waste.
OBJECTS OF THE INVENTION
The present invention has the objective of providing a polymer composition that has a disinfecting effect, so that it can be further processed, particularly into containers where a disinfecting effect plays a role, for example, in the production of storage and transportation containers as well as disposal containers.
An additional objective of the present invention is the preparation of a polymer master batch that contains the above-mentioned additive and that can thus be further processed into the above-mentioned containers.
Another objective of the present invention is a preparation process for the above-mentioned polymer composition or for the above-mentioned polymer master batch.
Another objective of the present invention is the further processing of the above-mentioned polymer composition as well as of the above-mentioned polymer master batch into containers containing plastic, especially into storage and transportation containers and disposal containers of this kind.
Finally, another objective of the present invention is the use of phenols for the protection of the container contents as described above for materials containing plastic, particularly storage and transportation containers as well as disposal containers made thereof.
SUMMARY OF THE INVENTION
It was surprisingly found that, by using a specific quantity of a phenol that up until now has only been utilized in the cosmetic sector as well as in the classical disinfectant sector, it is possible to achieve a material-protecting, that is to say, disinfecting effect in conjunction with the above-mentioned special polymer compositions or with the polymer master batch.
Thus, the present invention relates to a polymer composition in which the polymer is selected from among polyolefins, styrene polymers and polymers containing halogen, except for soft PVC, linear polyesters, linear polycarbamates, high-temperature-resistant plastics as well as recycled material stemming from these types of plastic, characterized in that, relative to the total composition, they contain 0.01% to 10% by weight, preferably 0.05% to 2% by weight, of at least one phenol in the form of halogenated dihydroxydiphenyl methane, dihydroxydiphenyl sulfide and/or dihydroxydiphenyl ether, except for the dihydroxydiphenyl sulfides, 2,2′-thiobis(6-halogeno-4-C
1-8
-alkyl phenol) and 2,2′-thiobis(6-halogeno-4-C
2-8
-alkenyl phenol).
A preferred group of the phenols employed are the halogenated dihydroxydiphenyl methanes, dihydroxydiphenyl sulfides or dihydroxydiphenyl ethers which are selected, for instance, from

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