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WO2018010038A1 - Structure multicouche polymère antimicrobienne - Google Patents

Structure multicouche polymère antimicrobienne Download PDF

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Publication number
WO2018010038A1
WO2018010038A1 PCT/CL2017/000029 CL2017000029W WO2018010038A1 WO 2018010038 A1 WO2018010038 A1 WO 2018010038A1 CL 2017000029 W CL2017000029 W CL 2017000029W WO 2018010038 A1 WO2018010038 A1 WO 2018010038A1
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WO
WIPO (PCT)
Prior art keywords
antimicrobial
sheet
multilayer structure
antimicrobial properties
food
Prior art date
Application number
PCT/CL2017/000029
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English (en)
Spanish (es)
Inventor
Roberto MOSER ROSSEL
Original Assignee
Moser Rossel Roberto
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of WO2018010038A1 publication Critical patent/WO2018010038A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A01N25/08—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing solids as carriers or diluents
    • A01N25/10—Macromolecular compounds
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A01N25/34—Shaped forms, e.g. sheets, not provided for in any other sub-group of this main group
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
    • A01N59/16—Heavy metals; Compounds thereof
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
    • A01N59/16—Heavy metals; Compounds thereof
    • A01N59/20—Copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/04—Layered products comprising a layer of synthetic resin as impregnant, bonding, or embedding substance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/02—Wrappers or flexible covers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
    • B65D81/28—Applications of food preservatives, fungicides, pesticides or animal repellants
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Definitions

  • the present invention discloses a multilayer structure with antimicrobial properties comprising at least one polymer sheet, where the last sheet, which remains inside the multilayer and in contact with food, is an antimicrobial polymer sheet that eliminates microorganisms from the surface of the food in contact with it, significantly lengthening the shelf life of these and a container with antimicrobial properties comprising said multilayer structure, allowing the preservation and transport of perishable products, keeping their organoleptic properties unaltered for a longer period, especially food in its natural state
  • the last polymer sheet that provides the antimicrobial property contained in its matrix it is activated only with the presence of moisture that permeates it, that is, the chemical reaction occurs inside the polymer. This moisture existing outside the antimicrobial sheet is also the ideal condition in which the microorganisms to be eliminated are developed.
  • thermoplastic materials easily manufactured
  • other polymers or fillers of different nature within the structure of the container wall.
  • PACKAGING FOR PERISHABLE PRODUCTS to be a barrier to gases such as oxygen, carbon dioxide, water vapor and ethylene among others, which in contact with food alter their qualities, either from changing the appearance to the appearance of pathogens harmful to health.
  • the plastic barrier containers contain in their structure some type of material with the property of substantially diminishing or eliminating the passage of these substances.
  • the plastic barrier containers can be divided into static and active.
  • the first are materials that make barriers to the passage of substances that you want to leave out and that have a constant behavior over time.
  • An example of these are the barriers that a metal film has between its components.
  • a metallized film is a normally plastic or cellulosic film on which a thin metallic coating has been applied.
  • these are materials that, in addition to being a barrier like the first, have additives with chemical activity that capture the substance to be stopped.
  • the oxygen sequestrants stand out here, which allow the protection of the barrier to be extended against its passage. This extends the life of the barrier and therefore the product that you want to keep.
  • Patent EP0349440B1 An example of an oxygen sequestrant additive is the active nanocomposite materials based on nano-clays modified with cerium oxide or metallic cerium (WO 2013186416 A2).
  • a package is antimicrobial when it incorporates several active substances in it, so that they are effective in inhibiting or retarding microbial growth (altering or pathogenic) and / or oxidation on the surface of the food.
  • These substances can be incorporated directly into the containers, so that they are released in a controlled way into the head space (volatile substances such as essential oils), or they are migrating to the surface of the food (organic compounds such as sorbates and benzoates).
  • Another option is to immobilize the active agents (eg bacteriocins) on the surface of the container, exerting its action through direct contact with the product.
  • WO 2013149356 refers to packages that extend the shelf life of food by incorporating an antifungal agent on its surface, particularly for berry containers.
  • the containers that contain antimicrobial elements on their inner faces do not maintain the organoleptic characteristics of the products since there is a migration of these elements to the surface of the food. This does not occur with the antimicrobial elements contained in a polymer matrix.
  • Copper-containing materials act as antimicrobial materials since they react with moisture and oxidize, releasing Cu2 + ions that, when they reach microorganisms, damage their cell wall, which results in their death. (Borkow and Gavia 2005). Then the materials capable of releasing enough Cu 2+ are classified as antimicrobial. This behavior also occurs for metals such as silver, zinc and tin, and / or mixtures and salts of these elements, which classifies them as copper as an antimicrobial agent.
  • An inorganic biocidal agent (A) is defined as compounds based on copper, silver, zinc, gold, bismuth, mercury, tin, antimony, cadmium, chromium, tantalum, iron, manganese and lead, their oxides, hydroxides, acetates, carbonates , chlorides, nitrates, phosphates, sulfates, sulphides, and mixtures thereof, presenting biocidal activities (WO 2015011630).
  • the bactericidal and fungicidal action of the elements described above can be introduced into the matrix of the polymers, at the time of manufacturing the sheets that make up these plastic containers, such as polypropylene, polyethylene, polyester resins, etc.
  • antimicrobial compositions that employ zeolite particles as support for antimicrobial metal ions. That is to say, when treating the zeolite with metal ion solutions, a cationic exchange takes place where antimicrobial metal ions are incorporated therein acquiring the antimicrobial properties of these, which is called loading. This occurs in both natural and synthetic zeolites. In these cases where antimicrobial properties are incorporated into another element, such as zeolite, the microporous mineral used is called support.
  • the support or carrier material (B) correspond to organic or inorganic materials, selected from zeolite, silicates, sepiolite and dolomite, wollastonite, mica, ceramics, carbon, activated carbon, clay, hydroxyapatite, kaolin, talc, calcium carbonate, stone Pumice, natural or synthetic fibers, coconut fiber (WO 2015011630).
  • the support for charged antimicrobial metal ions can also be incorporated to the polymer matrix using a previously elaborated masterbatch and which is composed of small pellets that have the charged zeolite incorporated perfectly distributed in the polymer so that it can be distributed homogeneously during the polymer extrusion process.
  • a previously elaborated masterbatch which is composed of small pellets that have the charged zeolite incorporated perfectly distributed in the polymer so that it can be distributed homogeneously during the polymer extrusion process.
  • the use of particles of Zeolite in polymeric articles is described in detail in US Patent 4,775,585 (Hagiwarn et al., 1988).
  • the antibacterial elements described above and which are contained in a polymer matrix they have a passive nature with respect to the pathogens that are to be eliminated.
  • the antimicrobial properties to act it must be in contact with the food, which is achieved with a multilayer of the vacuum barrier type with the last layer with antimicrobial properties that is in contact with the surface of the packaged food and the same in the case of semi-rigid containers containing liquids where these are mostly in contact with the antimicrobial walls of the last polymeric layer of the container, except for the small amount of air that may remain inside.
  • Figure 1 Basic multilayer structure, where the outer layer 1 (Polypropylene with EVA) can be used to add some type of printing, the intermediate layer 2 (Polyester) has the sole purpose of providing as a barrier element and the inner layer 3 ( Low density polyethylene). It is in this inner layer where the antimicrobial particles are incorporated and it is the one that generally provides the properties of sealing by pressure and heat, having prior corona treatment.
  • the outer layer 1 Polypropylene with EVA
  • the intermediate layer 2 Polypropylene with EVA
  • the inner layer 3 Low density polyethylene
  • Figure 2. It is the image of a piece of meat vacuum packed in a plastic barrier container, transparent and flexible, where you can see the contact of the inner layer of the vacuum container with the food, where the antimicrobial capacity of East.
  • Multilayer structure with antimicrobial properties comprising at least one polymer sheet, the last sheet of this being an antimicrobial polymer.
  • the multilayer structure aims to stop the passage of oxygen, water vapor, carbon dioxide and other gases from outside, extending for this concept the shelf life of food and / or products sensitive to them and because the last sheet that remains at
  • the interior of the multilayer, which is in contact with the food is a polymer that contains in its matrix particles of at least one metal and / or its salts or a support for previously charged metal ions, which produce antimicrobial activity when activated by the presence of moisture that permeates the last polymeric layer, releasing ions that leave the polymer that contains the particles acting on the surface in contact with the moisture or very close to it, eliminating the food pathogens that are within reach by means of mechanical action of these, damaging their cell wall which has the effect of their death.
  • the effectiveness of the antimicrobial sheet is given by the contact it has with the surface of the food, so a flexible plastic container that adapts to the shape of the food by means of a vacuum, called a vacuum barrier, is a good way to ensure its maximum effectiveness against the pathogens that act on their surface.
  • the antimicrobial activity produced by the oxidation of metal particles and / or their salts or the release of the ions of the metal ion support contained in a polymer that is permeated by moisture, is given by their proximity to the surface where they are located the bacteria, fungus and virus that you want to eliminate through the action of the released ions, which destroy the outer membranes of these microbes, which ultimately causes their death. That is, the effect of antimicrobial activity is inversely proportional to the distance between the surface of the sheet that is in contact with the microorganism and where the release of the ions occurs, that is to say the thickness of the sheet containing the particles that release antimicrobial ions.
  • the installation of the metal particles and / or their salts or the support of metal ions in a polymer permeable to moisture and therefore to the oxygen that reacts generating the ions on the immediate surface in contact with the pathogens can be achieved in different ways .
  • the barrier which combines two or more sheets of polymers that form a single multilayer sheet that act as a barrier against the passage of oxygen, carbon dioxide, moisture and other gases through her.
  • the inner sheet that will be in contact with the food is that which contains the metal particles and / or their salts or the support of metal ions, providing their antimicrobial properties.
  • This multilayer can be achieved by laminating the different layers or films of polymers or by simultaneous extrusion or coextruction of two or more polymers, Figure 2.-, which are joined in the extruded sleeve that rises vertically, always leaving the polymer with antimicrobial properties on its inner face.
  • An example of a multilayer of transparent container of vacuum barrier food is formed by an outer layer of polypropylene with EVA glued on a polyester sheet and both laminated on a low density polyethylene, Figure 1.- East Multilayer film or barrier has the fundamental characteristic that decreases the permeability of oxygen, carbon dioxide, water vapor and other gases inside the package, which reduces the proliferation of unwanted microorganisms in food.
  • a clear example of this is the packaging of vacuum meat, beef, chicken, fish and others, where the difference in pressure that occurs on both sides of the polymer barrier, internal vacuum and outside atmospheric pressure, increases the passage of oxygen through it, so that the presence of the antimicrobial sheet in its inner layer will be actively acting in the elimination of microorganisms that are in contact with it, product of moisture (water vapor) that permeate this sheet loaded with elements antimicrobials, increasing the shelf life of the product.
  • the inner sheet is low density polyethylene with the metal particles and / or their incorporated salts or the ion support metallic, since this sheet has been subjected to the corona treatment, it allows the sealing of this container simply by heat and pressure.
  • the experience in this aspect is that the presence in the polyethylene of the metal particles and / or their salts or the support of metal ions, due to their low concentration, which depending on the biocidal activity that is desired to obtain should not exceed one per One hundred weight / weight and for a thickness of 20 microns, it maintains its sealing properties by means of pressure and temperature.
  • concentrations of the metal particles and / or their salts or the support of metal ions in the polymer in the ranges below one percent weight / weight and the thicknesses below 40 microns allow the container to maintain the transparency of the polymers that the they compose, without significantly altering it, which makes it possible to visualize, in the example of the vacuum-packed meat, perfectly what you want to show and what is the essential objective of the transparent plastic container.
  • the food container is in direct contact with the antibacterial polymer sheet
  • the heat shrink which depending on its characteristics, can be formed by one or more layers of polymers, leaving the sheet with the properties inside antimicrobial
  • This material is also made by means of horizontal extrusion.
  • heat shrinkable containers there is no pressure differential between the inside and outside of the container so that the barrier characteristics for the passage of oxygen are less demanding, but this material always keeps the inner antimicrobial sheet pressed in contact with the surface of the food, so that we can act as such.
  • Another way to make the inner sheet of the barrier of the container antimicrobial is by applying a varnish based on a polymer, with particles of at least one metal and / or its salts or the support of metal ions contained inside , on another polymer with corona treatment to achieve its correct bonding or simply on a cardboard and / or paper. If a varnish with some type of solvent is used, it allows to achieve very thin films with the antimicrobial properties very close to the food and in a very simple and efficient way, without being exposed. That is, when the solvent evaporates, the weight / weight ratio of the particles increases while reducing the thickness of the polymer film.
  • the quality of the anchoring of the polymer-based varnish will determine the use of the varnish, since otherwise the anchoring could allow it to migrate to the surface of the food, which could be an unwanted effect.
  • the varnish as the last element in contact with food is widespread in the canning industry, so its characteristics are sufficiently studied and regulated.
  • the barrier can be given by a cardboard sheet, which gives the container a semi-stiffness characteristic and limits its transparency, one or more sheets of polymers attached to it inside, with the last sheet with at least one metal and / or its exits or the support of metal ions contained and that provide the antimicrobial property.
  • any polymeric organic resin in particular polyolefins (polyethylene and polypropylene) can be used to contain the particles of at least one metal and / or its salts or of the metal ion support, these being the most commonly consumed plastic materials.
  • the central objective of the antimicrobial characteristic of the last polymeric sheet of the multilayer is to extend the shelf life of the food, the result described above not only guarantees it, but also allows us to conclude that it can improve the state of the surface of the food by eliminating pathogens that are already in it and not only inhibiting its growth.
  • the process of extrusion of polymers with particles of at least one metal and / or its salts or a support for charged antimicrobial metal ions can deliver as a product continuous fibers that have inside, completely contained by the polymer, particles with antimicrobial properties.
  • the particles are contained in the polymer matrix, which allows it to be activated by the action of moisture that passes through the polymer and produce its antimicrobial effect without migrating from its position in the matrix. Only the ions that are produced from the polymer leave the polymer fibers reaction of particles with moisture.
  • the product that is required to protect from the action of pathogens has a complex form to be reached by the walls of the multilayer container with antimicrobial properties, by the action of vacuum, it is incorporated into the interior of the container, especially in places where walls can hardly reach on the food, a filler of antimicrobial polymer fibers that has the appearance of a "synthetic cotton padding" that allows the action of the vacuum to approach the walls of the food, that is to say coming into contact with the surface of the product or food to be protected, generating a network of polymer fibers with antimicrobial properties that remain in contact with the surface.
  • the multilayer container is complemented by including a "fiber filling with antimicrobial properties" that act in those areas where many fluids accumulate or it is difficult to achieve full contact of the product or food with the antimicrobial container.
  • An advantage that these fibers have in relation to the multilayer is that the diameter of these fibers, which can be achieved, is much smaller than the thickness of the sheets, so that their action is much more efficient.
  • a direct use of this "fiber filling with antimicrobial properties" is in the packaging of fruits very sensitive to the action of fungi and other pathogens and that are difficult to wash, so it is undesirable to apply products directly on their husks and that would end up being ingested with the fruit when it is consumed, instead a characteristic of this "fiber filling with antimicrobial properties” is that it always remains cohesive, so it is very easy to remove them from the fruit.
  • Another way that "fiber filling with antimicrobial properties” can be used is to include in the package of small fruits thin layers of filling that form a spongy sheet on which small fruits, such as berries, are placed in layers.
  • This spongy filling layer is molded to the fruits achieving, in its correct use, wrapping each fruit with fibers with antimicrobial properties, which allows to protect the fruit from the action of pathogens. It also acts as an antimicrobial filter to form a volume that must be traversed by fungal spores or other pathogens to reach the fruits, that if the humidity conditions are conducive to their proliferation, they will also be for the emission of ions from the contained antimicrobial particles in the filaments, which when they reach the membranes of these will pierce them, causing death. Depending on the type of fruit this filling can be used in multilayer containers with vacuum or semi-rigid antimicrobial properties, as well as in containers without antimicrobial characteristics, since these are provided by the "fiber filling with antimicrobial properties".

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Pest Control & Pesticides (AREA)
  • Chemical & Material Sciences (AREA)
  • Plant Pathology (AREA)
  • Dentistry (AREA)
  • Environmental Sciences (AREA)
  • Zoology (AREA)
  • Agronomy & Crop Science (AREA)
  • Wood Science & Technology (AREA)
  • Food Science & Technology (AREA)
  • Inorganic Chemistry (AREA)
  • Toxicology (AREA)
  • Organic Chemistry (AREA)
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Abstract

La présente invention concerne une structure multicouche ayant des propriétés antimicrobienne qui comprend au moins une couche de polymères, la dernière couche, qui reste au centre de la multicouche et en contact avec l'aliment, étant une couche de polymère antimicrobien qui élimine les microorganismes de la surface de l'aliment en contact avec elle, augmentant sensiblement la vie utile de ceux-ci et un contenant ayant des propriétés antimicrobiennes qui comprend ladite structure multicouche, permettant la conservation et le transport des produits périssables, avec un maintien sans altération de leurs propriétés organoleptiques sur une durée plus longue, spécialement les aliments dans leur état naturel. Le fait que la dernière couche soit une couche de polymères confère la propriété antimicrobienne contenue dans sa matrice, et celle-ci ne s'active qu'en présence d'humidité qui la traverse par perméation, c'est-à-dire la réaction chimique qui se produit à l'intérieur du polymère. L'humidité qui existe à l'extérieur de la couche antimicrobienne est en outre la condition idéale dans laquelle se développent les microorganismes qu'on souhaite éliminer.
PCT/CL2017/000029 2016-07-10 2017-09-08 Structure multicouche polymère antimicrobienne WO2018010038A1 (fr)

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CL1764-2016 2016-07-10
CL2016001764A CL2016001764A1 (es) 2016-07-10 2016-07-10 Muticapa polimerica antimicrobiana

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Publication number Priority date Publication date Assignee Title
CN110039805A (zh) * 2019-06-04 2019-07-23 广东中兴塑料纸类印刷有限公司 一种包装用复合膜的生产工艺

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