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WO2008104023A1 - Films d'emballage - Google Patents

Films d'emballage Download PDF

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Publication number
WO2008104023A1
WO2008104023A1 PCT/AU2008/000253 AU2008000253W WO2008104023A1 WO 2008104023 A1 WO2008104023 A1 WO 2008104023A1 AU 2008000253 W AU2008000253 W AU 2008000253W WO 2008104023 A1 WO2008104023 A1 WO 2008104023A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating
water dispersible
film according
film
water
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.)
Ceased
Application number
PCT/AU2008/000253
Other languages
English (en)
Inventor
David Carew
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.)
Amcor Pty Ltd
Original Assignee
Amcor Pty Ltd
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
Priority claimed from AU2007901001A external-priority patent/AU2007901001A0/en
Application filed by Amcor Pty Ltd filed Critical Amcor Pty Ltd
Publication of WO2008104023A1 publication Critical patent/WO2008104023A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • B65D65/46—Applications of disintegrable, dissolvable or edible materials
    • B65D65/466—Bio- or photodegradable packaging materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0059—Degradable
    • B29K2995/006—Bio-degradable, e.g. bioabsorbable, bioresorbable or bioerodible
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0059—Degradable
    • B29K2995/0062—Degradable water-soluble
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2303/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
    • C08J2303/02—Starch; Degradation products thereof, e.g. dextrin
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2400/00—Characterised by the use of unspecified polymers
    • C08J2400/14—Water soluble or water swellable polymers, e.g. aqueous gels
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • 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 relates to flexible water dispersible films having different water dispersion rates on the two sides of the films .
  • dispersable film in this context is understood to cover both breakdown of a film into smaller sections, or particulates, on contact with water and also dissolution of a film on contact with water. It should be further understood in this context that when a dispersable film is broken down in water then it is possible for it to breakdown into either particulates that, while invisible to the eye, will eventually settle out giiren the opportunity, or fully. soluble molecules that will not settle out.
  • Water dispersible flexible film ⁇ may be used, for example, for wrapping materials when the materials need to be wrapped securely for an extended period and then released automatically and where flexible 1 film residues would be disadvantageous .
  • Water soluble flexible films of -many types are known in the art.
  • Polymeric resins such 4s poly vinyl alcohol, polyacrylates , polymethacrylates j and others are disclosed in patent literature for use as ⁇ water soluble films.
  • films include, for example, wrapping dry products, as disclosed in US ,7, 005,168, and wrapping low water activity liquids such as detergents or fabric conditioning compositions.
  • Significant development work has been performed on the use of modifiers to change the rate of dissolution of films and the water activity of dissolution, and to modify films to be insoluble in the presence of certain materials in water, such as selected surfactants.
  • water soluble flexible films is as carriers for ingestible pharmaceutical preparations.
  • Polymers for making such films include, for example, poly vinyl alcohol, as disclosed, in US 5,948,430, and Pullulan (Trade Mark), as disclosed in US 7,025,983, as carriers for portable mouthwash compositions.
  • Films of the known art are either slowly soluble, or rapidly soluble, or are only soluble in specific chemical environments.
  • a known issue with most toilets is the need to carry significant amounts of water for flushing. This is most critical, for example, in aircraft, where a significant weight of water is carried fo ⁇ the sole purpose of flushing lavatories, and this weight increases the energy consumption of aircraft.
  • Another potential solution for disposal of benign waste materials is to wrap the waste in biodegradable t polymer films that can later be treated by biodegradation with the waste in a conventional water based treatment facility.
  • a lavatory could ba designed to wrap human waste in this way.
  • a desirable film for such application must be highly resistant to warm water contact prior to wrapping waste and!readily dispersible after use.
  • water resistance is understood to mean the elapsed time of contact of pure water at 23 0 C on the surface of a film, substrate or coated film required to reduce the tensile strength of the film, coated film or substrate to less than 10% of its original uncoated tensile strength.
  • the tensile strength may be determined by any means known in the art .
  • a water dispersible flexible film that includes a water dispersible substrate and a coating on one side or a first side of the substrate that provides water resistance that slows water degradation of the film when the first side of the film is contacted by wet substances compared to water degradation of the film that occurs when the other side or second side of the substrate is contacted by wet substances .
  • the second side of the substrate may be uncoated.
  • the second side of the substrate has a coating that provides a lower water resistance than the coating on the first side of the substrate.
  • the rate of degradation when water contacts the second side is less than rate of degradation when water contacts the first side.
  • a package made from the above-described water dispersible flexible film that is designed to retain wet contents within the package for a required period of time and which readily degrades when the film is contacted by wet substances on the outside of the package.
  • the first side of the film that has higher water resistance; forms the inside of the package .
  • a method of handling liquid containing materials that includes packaging the materials in packages made from the above-described water dispersibl ⁇ flexible film, whereby the film releases the contents of; the packages through wetting the outside of the packages, wherein the packages fail through external and not internal wetting of the packages .
  • the water 'dispersible flexible film of the present invention includes a water dispersible substrate that has a water resistance of less than one hour, preferably less than 10 minutes, and most preferably less than 2 minutes , and a hydrophobic coating on one side of the substrate.
  • the hydrophobic coating may be e ⁇ f any composition .
  • Suitable hydrophobic coatings comprise waxes, polymeric resins, fats and oils, proteins ,or other biologically sourced materials .
  • the hydrophobic coating is selected to modify the water resistance of the water dispersible Jflexible film on that side of the substrate.
  • the substrate is a flexible biodegradable film according to European Standard EN13432- 2000.
  • a suitable substrate is a flexible starch based film ("Plantic ® film") as described in US patents 5,316,578 and 5,346,936, International applications PCT/AU2005/000794, PCT/AU2005/001507 and PCT/AU2005/001605, US patent application 10/474907 and others in the name of Plantic Limited.
  • Plant ® film a flexible starch based film
  • the substrate in the absence of water, has comparable flexibility and tenacity to low density polyethylene (LDPE) .
  • LDPE low density polyethylene
  • tenacity in this context is used generically to summarize the resistance of the substrate to tear, puncture or fracture.
  • the coating is a biodegradable coating.
  • Example coating materials are aliphatic polyesters, although other materials may be suitable.
  • the coating material is degradable according to European Standard EN13432-2000.
  • the coating material is degradable under aquatic or other environmental conditions, and does not display significant ecotoxicity.
  • a preferred watei dispersible flexible film is based on a Plantic® film isubstrate.
  • the Plantic® film is marketed by Plantic® as ⁇ Rl" and comprises chemically modified high amylase starch, native starch, water soluble polymer, a stearat ⁇ , and water, and has a water resistance of less than one minute.
  • the film includes a polyester coating on one side of the above-described Plantic® film substrate that provides a water resistance on the coated side of greater than 6 hours .
  • a preferred coating is sold as ⁇ Rapidly Biodegradable Hydrophobic Material" (RBHM) by Polymate Ltd of Israel .
  • RBHM ⁇ Rapidly Biodegradable Hydrophobic Material
  • a coating such as RBHM is preferred due to the certified biodegradation of the coating.
  • Other polyester coatings, or coatings of other chemical nature, either specifically developed for the application or already available in the market are within the sc ⁇ pe of the present invention .
  • a normally rapidly dispersible film such as ' Plantic® Rl film has a water resistance of greater than 6 hours when coated with 3 grams per square metre of the RBHM' coating as described above.
  • the coating can be applied by any convenient means . Should the coating material be thermoplastic, extrusion coating, or even coextrusion with the substrate may be preferred.
  • the coating is not thermoplastic, solution coating methods are preferred.
  • Suitable solution coating methods are roller coating, rod coating, gravure coating, flexographic coating, spray coating, and bath coating.
  • the coating is only applied to the inside of a sealed package formed from the water dispersible film of the present invention, the package will have sufficient water resistance not to "disperse” (i.e. break down due to solubilization or mechanical failure of the material in the! liquid - breaking down may lead to total disappearance of the film) within an extended period of contact by a waste having a high water activity that is contained in the package, but wetting the outside of the package, say daring waste management or treatment, will rapidly disperse the packaging film.
  • the coating will not be strong enough to hold the package together once the substrate has been dispersed.
  • a film coated on one side with the above coating can be mechanically applied to a solid receptacle, such as a toilet in an aircraft, and accept wastes including liquid of water activity up to 1.0, and remain stable for an extended period.
  • a solid receptacle such as a toilet in an aircraft
  • wastes including liquid of water activity up to 1.0 and remain stable for an extended period.
  • the water dispersible film of the present invention is indexed through a disposal hatch, sealed if desired, and then severed.
  • the use of the water dispersible film of the present invention permits the reduction of the cartage of water in aircraft, and allows the final waste product to be treated as a. normal sewer discharge, thus requiring no infrastructure other than the modified lavatory .
  • starch polymer blends comprising film modifiers , sugar alcohols ,; polyols , and ester plasticizers are suitable.
  • Films shpwing acceptable tenacity and flexibility, and having acceptably low native water resistance, are also within the scope of the present invention .
  • water dispersible polymers based for example on cellulose rather than starch, may also be used.
  • One example is wrapping fresh food by a delicatessen in an edible version of the film, where the food is cooked, heated or otherwise prepared by placing the unopened packaging into cold or hot w ⁇ ter.
  • Another example is sterile packaging of small volumes of medical or pharmaceutical products, which are swallowed by the patient.
  • a further application is the us ⁇ of the film of the present invention in disposable medical applications .
  • Example applications include flushable colostomy bags and vomit collection bags that are currently Constructed from non-dispersible polymers .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Wrappers (AREA)

Abstract

L'invention concerne un film souple dispersable dans l'eau et des emballages, notamment des sacs, constitués de ce film souple dispersable. Le film dispersable de l'invention comprend un substrat de film biodégradable dispersable dans l'eau et un revêtement recouvrant au moins l'un des côtés du film pour conférer à ce film une résistance à l'eau différentielle sur les côtés opposés de ce film. Lors de son utilisation, le côté du film présentant la résistance à l'eau la plus forte est en contact avec la matière qui est en train d'être emballée à l'aide de ce film; et l'autre côté du film, qui présente une résistance à l'eau plus faible, forme l'extérieur de l'emballage. La matière présente dans l'emballage est libérée par contact de l'extérieur de l'emballage avec de l'eau, ce qui provoque la dispersion et la dégradation du film.
PCT/AU2008/000253 2007-02-27 2008-02-27 Films d'emballage Ceased WO2008104023A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2007901001 2007-02-27
AU2007901001A AU2007901001A0 (en) 2007-02-27 Packaging films

Publications (1)

Publication Number Publication Date
WO2008104023A1 true WO2008104023A1 (fr) 2008-09-04

Family

ID=39720789

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2008/000253 Ceased WO2008104023A1 (fr) 2007-02-27 2008-02-27 Films d'emballage

Country Status (1)

Country Link
WO (1) WO2008104023A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949145A (en) * 1975-02-27 1976-04-06 The United States Of America As Represented By The Secretary Of Agriculture Degradable starch-based agricultural mulch film
US4551369A (en) * 1980-01-09 1985-11-05 Belz Roland Karl Composite packaging material and process for making same
EP0593952A1 (fr) * 1992-10-17 1994-04-27 DISPO-Kommerz AG Produit pour la libération d'agents de traitement dans le liquide laveur d'un lave-linge ou d'un lave-vaisselle automatique
GB2352725A (en) * 1999-07-30 2001-02-07 Mcbride Robert Ltd Detergent packaging
JP2003104436A (ja) * 2001-09-28 2003-04-09 Kuraray Co Ltd アルカリ性物質包装用水溶性フィルム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949145A (en) * 1975-02-27 1976-04-06 The United States Of America As Represented By The Secretary Of Agriculture Degradable starch-based agricultural mulch film
US4551369A (en) * 1980-01-09 1985-11-05 Belz Roland Karl Composite packaging material and process for making same
EP0593952A1 (fr) * 1992-10-17 1994-04-27 DISPO-Kommerz AG Produit pour la libération d'agents de traitement dans le liquide laveur d'un lave-linge ou d'un lave-vaisselle automatique
GB2352725A (en) * 1999-07-30 2001-02-07 Mcbride Robert Ltd Detergent packaging
JP2003104436A (ja) * 2001-09-28 2003-04-09 Kuraray Co Ltd アルカリ性物質包装用水溶性フィルム

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 199417, Derwent World Patents Index; Class A92, AN 1994-137252 *
PATENT ABSTRACTS OF JAPAN *

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