EP1643840A1 - Containers from thermoplastic materials with bactericidal characteristics - Google Patents

Containers from thermoplastic materials with bactericidal characteristics

Info

Publication number
EP1643840A1
EP1643840A1 EP04775194A EP04775194A EP1643840A1 EP 1643840 A1 EP1643840 A1 EP 1643840A1 EP 04775194 A EP04775194 A EP 04775194A EP 04775194 A EP04775194 A EP 04775194A EP 1643840 A1 EP1643840 A1 EP 1643840A1
Authority
EP
European Patent Office
Prior art keywords
containers
biocide
bactericidal
thermoplastic materials
fluids
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP04775194A
Other languages
German (de)
French (fr)
Inventor
Ionel SCÎRLET
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valrom Industrie Srl
Original Assignee
Valrom Industrie Srl
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
Application filed by Valrom Industrie Srl filed Critical Valrom Industrie Srl
Publication of EP1643840A1 publication Critical patent/EP1643840A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material 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
    • B32B27/32—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
    • 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
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B32B2307/7145—Rot proof, resistant to bacteria, mildew, mould, fungi
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • 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
    • B32B2439/00—Containers; Receptacles

Definitions

  • the invention relates to a process of carrying out some containers from thermoplastic materials with bactericidal, bacteriostatical and antifungal characteristics for storing and sterilizing water and other fluids, these containers being carried out by the rotational molding process.
  • the bacteriostatical characteristics are obtained by the incorporation in the thermoplastic material of an inorganic biocide constituted from a mixture of titanium dioxide and silver chloride.
  • There are known different processes for obtaining the bactericidal characteristics which involve the use of organic chloride derivatives , incorporated in the content of the material.
  • the disadvantage of these materials consists of the maximum speed migration at the surface, in the sensitivity at the processing temperatures, the low effect in time and increased risk for the environment.
  • the biocide is constituted from a mixture of titanium dioxide as inert carrier and silver chloride as active material, by weight ratio of 8 : 2.
  • the mixture is finely crushed up to a residue of maximum 0,02% on the sieve of 45 ⁇ m and it is omogenized for 30...45 minutes by using a standard blender for powders.
  • the bacteriostatical effect is achieved at the interface between the thermoplastic material which has the biocide included therein and the fluid. Due to the very little solubility, it is established a controlled balance concentration of 3 parts per million of silver ions, the migration rate for silver ions being dictated by the consumption speed -(the silver ions are released as the consumption) -goes on thereby ensuring a very long life time.
  • the carrying out of the containers with bacteriostatical, bactericidal and antifungal characteristics is made by the incorporation of the biocide in the powder raw material, in a concentration ranging depending on thefinal product thickness between 0,005% by weight (for a thickness of 50 ⁇ m) and 0,2% by weight (for a thickness of 2 mm).
  • the biocide activity can se seen at the interface of the fluid-thermoplastic material and the use of the material in the products with walls formed from two layers is more economical and efficient, the biocide being included only in the internal layer with a reccomanded thickness of 0.05...1 mm.
  • the use of the biocide has the following advantages: -it can be utilised with any thermoplastic material known in this moment in industry (such as polyethylene, polypropilene, polystyrene and others ) without affecting the physical and chemical characteristics of the material -it is active in low concentrations (0,1...0,2 by weight) -the thermal stability is up to 450°C and for a large domain of pH -the toxicity level is very low -it has minimum impact for the environment -it does not put problems for labour medicine (it is non irritating and non-alergical) -it has high activity for a large spectrum of microorganisms (bacteria, see weeds, mooshrooms and others) -it has excellent performance in a thin layer
  • the carrying out of the containers according to the invention is made by rotational moulding, a process of manufacturing which permits to obtain complicated geometrical forms and big dimensions, at competitive prices and which has no residual mechanical efforts.
  • the raw materials as powder is introduced into a mold provided with a pipe for ventilation and which has a simultaneous rotation about two axes.
  • the molding form is introduced into a furnace and heated up to the melting point of the material , which adheres to the walls thereof. After the complete melting of the material, the mold is removed from the furnace and cooled up to solidifycation point of the material. Both, the stop of forming in the furnace and the step of cooling are made with the mold in rotational movement about two axes forfixing the material to walls thereof.
  • This process for manufacturing containers permits to obtain containers with walls formed from one or two layers , the biocide being introduced in the single layer or in the interior layer.
  • the both layers can be formed from the same material or from different materials, for example polyethylene of high density to the external side and polyethylene of low density to the internal side.
  • Example 1 In one example acccording to the invention, there was carried out one vertical cylindrical containerfrom low density polyethylene , with the capacity of 1000 litres, and the wall formed from two layers, the interior layer containing the biocide. For that purpose there were weghed two portions of polyethylene: one portion of 25 kg forthe exterior layer and one portion of 3 kg for the interior layer.
  • biocide according to the invention the mixture by weight ratio of 8: 2 of titanium dioxide : silver chloride
  • the material forthe exterior layer was introduced in the mold form, the mold form was closed and introduced into the furnace for 25 minutes to a temperature of 230°C,and the rotational speed about two axes was of 7,0, and 2,1 rot/min, respectively.
  • the mold form was drawn out from furnace, the ventilation plug was taken out and the previously prepared mixture containing polyethylene-biocidewas introduced , the form was closed and introduced into the furnace and was maintained there for 5 minutes for melting the mixture and the application thereof on the walls.
  • Example 2 In one example acccording to the invention, one horizontal cylindrical container was carried out from low density polyethylene, said container having the capacity of 3000 litres, and having the wall formed from one layer which contain the biocide.
  • the container For obtaining the container there are made the following: there were weighed 75 kg polyethylene and 10 g of biocide (a mixture in a weight ratio of 8: 2 of titanium dioxide : silver chloride) according to the invention which was homogenised for 20 minutes in a standard blender for powders.
  • the material was introduced into the mold form, the form was closed and introduced into the furnace for 30 minutes at a temperature of 230°C, the rotational speed about two axes was of 6, 1 ,and of 2,0 rot/min, respectivelly.
  • the mold form is drawn out from the furnace and cooled slowly for 60 minutes with a suitable power fan , the mold form being all time in rotational movement, the rotational speed about the two axes being of 7 and of 2,1 rot/min .respectivelly .
  • the rotational movement is stopped, the mold form is opened and the container obtained in this way is extracted therefrom.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Pest Control & Pesticides (AREA)
  • Wood Science & Technology (AREA)
  • Dentistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Inorganic Chemistry (AREA)
  • Plant Pathology (AREA)
  • Health & Medical Sciences (AREA)
  • Environmental Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Food Science & Technology (AREA)
  • Zoology (AREA)
  • Mechanical Engineering (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Packging For Living Organisms, Food Or Medicinal Products That Are Sensitive To Environmental Conditiond (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

The invention relates to containers with bactericidal, bacteriostatical and antifungal characteristics and to a process for obtaining these containers by rotational molding, using thermoplastic materials which comprise titanium dioxide and silver chloride in their composition. The containers carried out according to the invention , are intended for storing and sterilizing water and other fluids, in the conditions in which there is necessary to inhibit the microflora (bacteria, see weeds, mooshrooms and others), thereby preventing the biological and organoleptical modifications of the content for long time. The containers shall not be used for storing fluids in natural fermentation (wine, pickles and others) due to that inhibition.

Description

CONTAINERS FROM THERMOPLASTIC MATERIALS WITH BACTERICIDAL CHARACTERISTICS
The invention relates to a process of carrying out some containers from thermoplastic materials with bactericidal, bacteriostatical and antifungal characteristics for storing and sterilizing water and other fluids, these containers being carried out by the rotational molding process. The bacteriostatical characteristics are obtained by the incorporation in the thermoplastic material of an inorganic biocide constituted from a mixture of titanium dioxide and silver chloride. There are known different processes for obtaining the bactericidal characteristics which involve the use of organic chloride derivatives , incorporated in the content of the material. The disadvantage of these materials consists of the maximum speed migration at the surface, in the sensitivity at the processing temperatures, the low effect in time and increased risk for the environment. There are known processes which use silver deposits in very thin layers or the incorporation of colloidal silver in the product mass. This method supposes the use of bigquantities of silver which is very expensive and in shortage, surface treatments which can complicate very much the technologies for manufacturing and it leads to big production costs. The material is not used efficiently, the action being only at the surface of the fluid, the remainder of the material being inactive. The invention solves these problems by using an inorganic biocide based on silver ions, included in the mass of thermoplastic material, conferring bactericidal, bacteriostatical and antifungal characteristics to the material, the material being used for obtaining containers for storing and sterilizing water and other fluids. The biocide is constituted from a mixture of titanium dioxide as inert carrier and silver chloride as active material, by weight ratio of 8 : 2. The mixture is finely crushed up to a residue of maximum 0,02% on the sieve of 45 μm and it is omogenized for 30...45 minutes by using a standard blender for powders. The bacteriostatical effect is achieved at the interface between the thermoplastic material which has the biocide included therein and the fluid. Due to the very little solubility, it is established a controlled balance concentration of 3 parts per million of silver ions, the migration rate for silver ions being dictated by the consumption speed -(the silver ions are released as the consumption) -goes on thereby ensuring a very long life time. The carrying out of the containers with bacteriostatical, bactericidal and antifungal characteristics is made by the incorporation of the biocide in the powder raw material, in a concentration ranging depending on thefinal product thickness between 0,005% by weight (for a thickness of 50 μm) and 0,2% by weight (for a thickness of 2 mm). The biocide activity can se seen at the interface of the fluid-thermoplastic material and the use of the material in the products with walls formed from two layers is more economical and efficient, the biocide being included only in the internal layer with a reccomanded thickness of 0.05...1 mm. The laboratory studies, using the thin layer method applied to some cultures of bacteria (Staphylococcus aureus and Escherichia Coli) show a reduction of 99,6% for Staphylococcus aureus and of 95,2% for Escherichia Coli in the first 24 hours. The complete sterilization is obtained in aproximately 28 days from the storing date. The use of the biocide has the following advantages: -it can be utilised with any thermoplastic material known in this moment in industry (such as polyethylene, polypropilene, polystyrene and others ) without affecting the physical and chemical characteristics of the material -it is active in low concentrations (0,1...0,2 by weight) -the thermal stability is up to 450°C and for a large domain of pH -the toxicity level is very low -it has minimum impact for the environment -it does not put problems for labour medicine (it is non irritating and non-alergical) -it has high activity for a large spectrum of microorganisms (bacteria, see weeds, mooshrooms and others) -it has excellent performance in a thin layer The carrying out of the containers according to the invention, is made by rotational moulding, a process of manufacturing which permits to obtain complicated geometrical forms and big dimensions, at competitive prices and which has no residual mechanical efforts. By that process the raw materials as powder is introduced into a mold provided with a pipe for ventilation and which has a simultaneous rotation about two axes. The molding form is introduced into a furnace and heated up to the melting point of the material , which adheres to the walls thereof. After the complete melting of the material, the mold is removed from the furnace and cooled up to solidifycation point of the material. Both, the stop of forming in the furnace and the step of cooling are made with the mold in rotational movement about two axes forfixing the material to walls thereof. This process for manufacturing containers permits to obtain containers with walls formed from one or two layers , the biocide being introduced in the single layer or in the interior layer. Forthe multilayered construction, the both layers can be formed from the same material or from different materials, for example polyethylene of high density to the external side and polyethylene of low density to the internal side. Example 1 In one example acccording to the invention, there was carried out one vertical cylindrical containerfrom low density polyethylene , with the capacity of 1000 litres, and the wall formed from two layers, the interior layer containing the biocide. For that purpose there were weghed two portions of polyethylene: one portion of 25 kg forthe exterior layer and one portion of 3 kg for the interior layer. In the portion for the interior layer there were introduced 6 g of biocide according to the invention (the mixture by weight ratio of 8: 2 of titanium dioxide : silver chloride) which was homogenised a time for 20 minutes in a standard blender for powders. The material forthe exterior layer was introduced in the mold form, the mold form was closed and introduced into the furnace for 25 minutes to a temperature of 230°C,and the rotational speed about two axes was of 7,0, and 2,1 rot/min, respectively. The mold form was drawn out from furnace, the ventilation plug was taken out and the previously prepared mixture containing polyethylene-biocidewas introduced , the form was closed and introduced into the furnace and was maintained there for 5 minutes for melting the mixture and the application thereof on the walls. The mold form was drawn out from the furnace and cooled slowly for 40 minutes with a fan having a suitable power, the mold form being all time in rotational movement, the rotational speed about the two axes being of 7 and of 2,1 rot min, respectively . The rotational movement was stopped, the mold form was opened and the container obtained in this way was extracted therefrom. Example 2 In one example acccording to the invention, one horizontal cylindrical container was carried out from low density polyethylene, said container having the capacity of 3000 litres, and having the wall formed from one layer which contain the biocide. For obtaining the container there are made the following: there were weighed 75 kg polyethylene and 10 g of biocide (a mixture in a weight ratio of 8: 2 of titanium dioxide : silver chloride) according to the invention which was homogenised for 20 minutes in a standard blender for powders. The material was introduced into the mold form, the form was closed and introduced into the furnace for 30 minutes at a temperature of 230°C, the rotational speed about two axes was of 6, 1 ,and of 2,0 rot/min, respectivelly.The mold form is drawn out from the furnace and cooled slowly for 60 minutes with a suitable power fan , the mold form being all time in rotational movement, the rotational speed about the two axes being of 7 and of 2,1 rot/min .respectivelly . The rotational movement is stopped, the mold form is opened and the container obtained in this way is extracted therefrom.

Claims

Claims
1. Containers according to the invention, with bactericidal, bacteriostatical and antifungal characteristics, characterized in that , they are carried out from thermoplastic materials which incorporate a biocide constituted from a mixture of titanium dioxide and silver chloride in a weight ratio of 8:2 and a process for manufacturing them by rotational molding, with mono layer walls , said containers being intended for storing and sterilizing water and other fluids.
2. Containers according to the invention, with bactericidal, bacteriostatical and antifungal characteristics, characterized in that , they are carried out from thermoplastic materials which incorporate a biocide constituted from a mixture of titanium dioxide and silver chloride in a weight ratio of 8:2 and a process for manufacturing them by rotational molding, with two-layer walls, the interiorwall containing biocide , said containers being intended for storing and sterilizing water and other fluids.
EP04775194A 2003-06-30 2004-06-24 Containers from thermoplastic materials with bactericidal characteristics Withdrawn EP1643840A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ROA200300568A RO119784B1 (en) 2003-06-30 2003-06-30 Recipient for storing a liquid meant for alimentary consumption and process for making the same
PCT/RO2004/000011 WO2005000026A1 (en) 2003-06-30 2004-06-24 Containers from thermoplastic materials with bactericidal characteristics

Publications (1)

Publication Number Publication Date
EP1643840A1 true EP1643840A1 (en) 2006-04-12

Family

ID=33550538

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04775194A Withdrawn EP1643840A1 (en) 2003-06-30 2004-06-24 Containers from thermoplastic materials with bactericidal characteristics

Country Status (3)

Country Link
EP (1) EP1643840A1 (en)
RO (1) RO119784B1 (en)
WO (1) WO2005000026A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2441821A1 (en) 2010-10-14 2012-04-18 Unilever Plc, A Company Registered In England And Wales under company no. 41424 of Unilever House Laundry detergent particles
EP2631061A1 (en) * 2012-02-22 2013-08-28 Sotralentz Packaging S.A.S. Plastic container with antimicrobial properties and method of manufcture thereof
GB201708761D0 (en) 2017-06-01 2017-07-19 Pilkington Group Ltd Method and apparatus for shaping a glass sheet

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8616294D0 (en) * 1986-07-03 1986-08-13 Johnson Matthey Plc Antimicrobial compositions
JP3038133B2 (en) * 1995-03-14 2000-05-08 株式会社萩原技研 Antibacterial resin composition
GB9505083D0 (en) * 1995-03-14 1995-05-03 Johnson Matthey Plc Improvements in biocidal compositions
WO1997042824A1 (en) * 1996-05-10 1997-11-20 Toyo Boseki Kabushiki Kaisha Antimicrobial composition and antimicrobial laminate

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005000026A1 *

Also Published As

Publication number Publication date
WO2005000026A1 (en) 2005-01-06
WO2005000026B1 (en) 2005-03-03
RO119784B1 (en) 2005-03-30

Similar Documents

Publication Publication Date Title
Fernández et al. Migration of antimicrobial silver from composites of polylactide with silver zeolites
Shemesh et al. Antibacterial and antifungal LDPE films for active packaging
Guldiren et al. Antimicrobial property of silver, silver-zinc and silver-copper incorporated soda lime glass prepared by ion exchange
KR101994364B1 (en) Master batch of antimicrobial plastics and manufacturing method thereof
Mondal et al. Investigation on sodium benzoate release from poly (butylene adipate‐co‐terephthalate)/organoclay/sodium benzoate based nanocomposite film and their antimicrobial activity
JP7246108B2 (en) Manufacturing method of antibacterial plastic masterbatch of mexomseok granules
KR960004988B1 (en) Biocidal Compositions and Uses thereof
Hashimoto et al. Antimicrobial activity of geopolymers ion-exchanged with copper ions
WO2014209095A1 (en) Bacteriostatic and fungistatic additive in masterbatch for application in plastics, and method for producing same
Seabra et al. Porcelain stoneware tiles with antimicrobial action
Dhiman et al. Advanced biodegradable starch-based nanocomposite films incorporating zinc oxide nanoparticles: Synthesis, characterization, and efficacy in antibacterial food packaging applications
WO2005000026A1 (en) Containers from thermoplastic materials with bactericidal characteristics
KR20060068616A (en) Triple wall structure impact water pipe with antibacterial function
CN103068229B (en) Dibromomalonamide compositions and their use as biocides
KR101678314B1 (en) Manufacturing Method of Antibacterial Masterbatch Using Ionized Calcium Powder
Chylińska et al. Novel biocidal N-halamine plastic based on poly (vinyl chloride): preparation and characteristics
CN104472505B (en) A kind of mould inhibitor and application thereof
Eksirinimitr et al. Effects of simulation conditions on antibacterial performance of polypropylene and polystyrene doped with HPQM antibacterial agent
KR100794322B1 (en) Household antibacterial board containing far-infrared radiation salt and its manufacturing method
Caputo et al. A salicylate-functionalized PET packaging to counteract blue discoloration on mozzarella cheese under cold storage
CN105523266B (en) A kind of food fresh keeping glass container and its production method
EP3816126B1 (en) Antimicrobial composite material
KR101678315B1 (en) Method of Producing antibacterial Storage containers of an antibacterial master batch containing ionized calcium powder as a raw material
CN104970023A (en) Plastic mildew preventive and plastic mildew prevention technology
Wogo et al. The influence of Ag concentration on the antibacterial properties of plastic made from silica immobilized with EDTA-Ag combined with chitosan

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

17P Request for examination filed

Effective date: 20050709

DAX Request for extension of the european patent (deleted)
R17P Request for examination filed (corrected)

Effective date: 20060505

17Q First examination report despatched

Effective date: 20110404

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20131210