US20060243626A1 - Polymer packaging layer with improved release properties - Google Patents

Polymer packaging layer with improved release properties Download PDF

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Publication number
US20060243626A1
US20060243626A1 US10/545,800 US54580004A US2006243626A1 US 20060243626 A1 US20060243626 A1 US 20060243626A1 US 54580004 A US54580004 A US 54580004A US 2006243626 A1 US2006243626 A1 US 2006243626A1
Authority
US
United States
Prior art keywords
pet
packaging
polymer material
substrate
resin
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.)
Abandoned
Application number
US10/545,800
Other languages
English (en)
Inventor
Coenraad Spaans
Lene Hviid
Cornelis Waringa
Johannes Dommershuijzen
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.)
Tata Steel Ijmuiden BV
Original Assignee
Corus Staal BV
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 Corus Staal BV filed Critical Corus Staal BV
Assigned to CORUS STAAL BV reassignment CORUS STAAL BV ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DOMMERSHUIJZEN, JOHANNES JACOBUS, HVIID, LENE, WARINGA, CORNELIS JOHANNES, SPAANS, COENRAAD JAN
Publication of US20060243626A1 publication Critical patent/US20060243626A1/en
Assigned to TATA STEEL IJMUIDEN B.V. reassignment TATA STEEL IJMUIDEN B.V. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: CORUS STAAL B.V.
Abandoned 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • 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
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B32B2307/748—Releasability
    • 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
    • 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
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • 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
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/14—Copolymers of propene
    • 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
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/14—Copolymers of propene
    • C08L23/147—Copolymers of propene with monomers containing other atoms than carbon or hydrogen atoms
    • 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
    • C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers

Definitions

  • the invention relates to improved release of a product such as for example a food product from a product contact layer of packaging.
  • packaging encompasses containers, wrappers and the like for enclosing a product and closures such as lids for such containers or wrappers.
  • closures such as lids for such containers or wrappers.
  • the product contact layer that provides the release properties is conventionally a lacquer applied to the metal, the metal being in the form of e.g. tinplate or in some cases tin free steel designated as TFS or ECCS (electrolytically chrome coated steel).
  • TFS tin free steel
  • ECCS electrolytically chrome coated steel
  • special release additives are added to the product contact layer. Typical additives to achieve adequate release are wax like materials, e.g. Carnauba wax.
  • polyester e.g. polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • polyesters have poor product release properties, thereby limiting the scope of their use in packaging especially where good product release properties are required, such as in e.g. wide mouth food jars or fish cans.
  • EP 1086808 which recognises this problem with PET coatings, a wax component is to be added to such a PET coating to obtain better “taking-out property” of stuffed food contents, see table 1 C2, table 2 C2 and table 3 E1-E16 and C1-C3.
  • adding the waxes is expensive firstly because of the cost of such waxes and secondly because of complications in the handling and processing of the manufacture of the non-sticking polymer.
  • the use of a wax must be limited in connection with food quality and legislation issues.
  • EP 1174457 also discloses the addition of wax compounds to polyester film for laminating metal sheet for the production of cans.
  • a coating of an apolar resin viz. (mixtures of) a polypropylene (PP) and/or polyethylene (PE) or polytetrafluorethylene (PTFE) optionally provided with an extra layer of modified PP could be applied to the metal strip.
  • PP polypropylene
  • PE polyethylene
  • PTFE polytetrafluorethylene
  • this objective is achieved by using a polymer material as a product contact layer of packaging for a product where the polymer material is made from a blend of a polyester resin and an apolar resin such as a polyolefin.
  • the good product release properties or non-stick behaviour may be related to demixing of the polymers taking place.
  • the demixing results in a morphology where apolar resins such as polyolefins are dispersed in a polar polyester matrix, making the surface less polar and thereby decreasing the affinity of the coating towards sticky products such as many foodstuffs.
  • the polymer material according to the invention as compared to polyester material shows improved product release properties as well as good retort resistance.
  • the apolar resin is PP. This has the advantage that the resulting polymer material is relatively cheap.
  • the apolar resin is modified PP. This achieves an improved extrusion behaviour believed to be resulting from a better compatibility of the resin with PET compared to unmodified PP.
  • the apolar resin is maleic acid anhydride modified PP. In this way also a better interaction with the PET is obtained.
  • the apolar resin is PE.
  • PE a simple cheap polymer very similar to PP is used.
  • the apolar resin is a copolymer comprising PP and PE. This achieves a more amorphous system than the standard PP, which provides even better release characteristics.
  • the apolar resin is EPDM.
  • the polyester is PET (polyethylene terephthalate) or modified PET (e.g. glycol modification with CHDM and/or terephthalate modification by isophthalate) or PEI (polyethylene isophthalate) or PBT (polybutylene terephthalate) and combinations (blends and/or copolymers) thereof.
  • the polymer material preferably contains a blend of 5-25% PP in PET or more preferably 10-25% PP in PET or even more preferably 15-25% PP in PET. At higher levels of PP in PET it becomes increasingly difficult to produce a stable polymer material.
  • the polymer material according to the invention is coated on a metal substrate or sheet.
  • a metal substrate provided with such a coating has the advantage that it can be used to manufacture metal cans for sticky products, e.g. for canned salmon, while achieving good release from the can after opening.
  • the polymer material can be relatively conveniently produced by feeding the respective polyester and apolar resin granulates directly into a feeding system of an extruder, taking care in the feeding system not to exceed the temperature at which the apolar resin softens or melts.
  • the polymer material can easily be applied to substrates, which can subsequently be formed into packaging or can act as a wrapping itself.
  • the polymer material of the present invention is particularly suitable for coating at least one side of a metal substrate, made from for example, packaging steel, which is subsequently formed into packaging. Despite the rigorous processing steps the substrate is subjected to in order to form the packaging, the product release properties of the polymer material, which forms the product contact layer of the packaging, are maintained. The sterilisability of the coating also remains intact.
  • the polymer material can form a single coating layer or a single (sub) layer of a multi layer system.
  • a multi layer system instead of a two or one layer system.
  • the functional layer that forms the product contact surface can be kept thin, which is favourable for coating integrity during these retort processes.
  • the present invention also relates to packaging for a product wherein the packaging comprises a product contact layer which in use contacts the product wherein said contact layer comprises a polymer material made from a blend of a polyester resin and an apolar resin such as a polyolefin.
  • the packaging has improved product release properties as compared to packaging where the contact layer comprises a polymer material made from essentially the polymer resin, whilst the polymer also has acceptable manufacturability and processability properties.
  • the apolar resin is PP. This has the advantage that the resulting polymer material is relatively cheap.
  • the apolar resin is modified PP. This achieves an improved extrusion behaviour believed to be resulting from a better compatibility of the resin with PET compared to unmodified PP.
  • the apolar resin is maleic acid anhydride modified PP. In this way also a better interaction with the PET is obtained.
  • the apolar resin is PE.
  • PE a simple cheap polymer very similar to PP is used.
  • the apolar resin is a copolymer comprising PP and PE. This achieves a more amorphous system than the standard PP, which provides even better release characteristics.
  • the apolar resin is EPDM.
  • the polyester is PET (polyethylene terephthalate) or modified PET (e.g. glycol modification with CHDM and/or terephthalate modification by isophthalate) or PEI (polyethylene isophthalate) or PBT (polybutylene terephthalate) and combinations (blends and/or copolymers) thereof.
  • the packaging preferably comprises a metal substrate coated with the polymer material.
  • the polymer material is preferably coated onto at least one side of the metal substrate before the substrate is formed into packaging. It has been found that the polymer material has acceptable manufacturability and forming properties and can thus be applied to a metal substrate before it has been formed into packaging.
  • the metal substrate coated with the polymer material may be produced according to a process wherein the polymer material is extruded, made into an extrudate or film, which extrudate or film is applied to the metal sheet.
  • the packaging is preferably retortable. It has also been found that the polymer material of the present invention has good retort resistance as well as good product release properties and can thus be used in retortable packaging.
  • the polymer material may form the product contact layer of a multi-layer system, whereby the polymer material can be kept thin, which is favourable for coating integrity during retort processes.
  • a can made from a packaging steel coated with said polymer material according to the invention has excellent release-from-can-properties, in particular for fish based and fish products, as will be shown hereafter by way of some non-limitative examples.
  • a two layer polymer film consisting of an adhesion layer and a bulk product contact layer was made by co-extrusion from a feedblock-die system using for the bulk product contact layer a standard bottle grade PET granulate representing as reference a pure PET film, and a standard bottle grade PET granulate blended with a standard PP homopolymer MFI 12 g/10 min granulate at different blend ratios representing variants of the polymer having improved release properties according to the invention.
  • the polymer extrudate was coated onto a conventional steel substrate (TFS/ECCS) of 0.20 mm (normally designated as T57 CA) and the resulting coated steel sheet was made into straight (non-tapered) food cans ⁇ 65 mm and height 93 mm in a 3-step DRD process using blanks ⁇ 198 mm.
  • the 3-step draw and redraw (DRD) process used was a standard process comprising cutting a blank of ⁇ 198 mm from the coated steel, drawing the blank through a die to form a cup and redrawing the cup without thinning the sidewall to form a can of ⁇ 65 mm and height 93 mm.
  • the cans were filled with fresh, bred atlantic salmon, closed and retorted for 90 minutes in an autoclave at a temperature of 121° C.
  • the cans were cooled in ambient air and stored at 35° C. for one week.
  • the area covered by the remaining salmon (hereafter also referred to as AC in %) was determined as the average of independent estimations by three different persons, in order to simulate perception by the consumer of the “stickiness” of the walls of the respective cans.
  • the blended materials of PET with PP show superior performance compared to the PET coated reference cans, the variant containing 10% showing superior release behaviour.
  • Example 1.1 was repeated with a different batch of salmon. The results are as shown in table 1.2.
  • a three layer polymer film made by co-extrusion from a feedblock-die system comprising an adhesion layer, a bulk layer and a top product contact layer, using for the bulk layer a standard bottle grade PET and for the top product contact layer a standard bottle grade PET granulate blended with a standard PP granulate at different blend ratios, the rest of the experiment being performed in the same way as in Examples 1.1 and 1.2.
  • the sterilisation performance (hereafter also referred to as SP) of the polymer film was also considered by sterilising samples of the substrate coated with polymer film with the different top layer variants in salty water (saline test) for 90 minutes at 121° C. in the presence of air, in order to determine whether the invention can be used in practice for packaging products that are retorted.
  • the top layers with approx. 10% PP in PET show superior release performance and adequate sterilisation performance.
  • Example 2.1 was repeated with a different batch of salmon. The results are as shown in table 2.2. Again, the effect of the addition of PP to PET on the release properties was clear.
  • Example 2.2 was repeated with a different batch of salmon. The results are as shown in table 2.3.
  • the weight of the adhering salmon retained (AR) is perceived as the most reliable indicator.
  • the effects of the invention are not limited to the embodiments of the invention in the examples, in particular regarding the used substrates.
  • the invention lies in realising a relatively uncomplicated polymer layer with good release properties.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Wrappers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
US10/545,800 2003-02-18 2004-02-18 Polymer packaging layer with improved release properties Abandoned US20060243626A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP03075471A EP1449883A1 (en) 2003-02-18 2003-02-18 Polymer packaging layer with improved release properties
EP03075471.7 2003-02-18
PCT/EP2004/001619 WO2004074376A1 (en) 2003-02-18 2004-02-18 Polymer packaging layer with improved release properties

Publications (1)

Publication Number Publication Date
US20060243626A1 true US20060243626A1 (en) 2006-11-02

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US10/545,800 Abandoned US20060243626A1 (en) 2003-02-18 2004-02-18 Polymer packaging layer with improved release properties

Country Status (13)

Country Link
US (1) US20060243626A1 (pl)
EP (2) EP1449883A1 (pl)
KR (1) KR101088609B1 (pl)
CN (1) CN1759144A (pl)
AU (1) AU2004213576B2 (pl)
BR (1) BRPI0407580A (pl)
CA (1) CA2516330A1 (pl)
DE (1) DE602004022026D1 (pl)
ES (1) ES2328243T3 (pl)
PL (1) PL378074A1 (pl)
RU (1) RU2340459C2 (pl)
WO (1) WO2004074376A1 (pl)
ZA (1) ZA200506573B (pl)

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US20070092742A1 (en) * 2003-03-28 2007-04-26 Corus Staal Bv Sheet material for forming applications, metal container made form such a sheet material and process for producing said sheet material
US9186875B1 (en) 2005-09-13 2015-11-17 Mark V. Loen Processing improvements in applying polyester onto a metal substrate
US20160183544A1 (en) * 2014-12-31 2016-06-30 Toray Plastics (America), Inc. Starch coated polyester film for release of canned meat products
US20220024083A1 (en) * 2018-12-21 2022-01-27 Tata Steel Ijmuiden B.V. Method for producing a polymer coated metal strip and polymer coated metal strip produced thereby

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US20170198103A1 (en) * 2016-01-13 2017-07-13 Equistar Chemicals, Lp Polyolefin-based compositions, adhesives, and related multi-layered structures prepared therefrom
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AU2004213576A1 (en) 2004-09-02
RU2340459C2 (ru) 2008-12-10
KR20050107580A (ko) 2005-11-14
EP1449883A1 (en) 2004-08-25
AU2004213576B2 (en) 2009-03-26
CA2516330A1 (en) 2004-09-02
CN1759144A (zh) 2006-04-12
EP1601722A1 (en) 2005-12-07
ES2328243T3 (es) 2009-11-11
EP1601722B1 (en) 2009-07-15
RU2005129090A (ru) 2006-01-27
WO2004074376A8 (en) 2006-02-23
WO2004074376A1 (en) 2004-09-02
DE602004022026D1 (de) 2009-08-27
ZA200506573B (en) 2006-12-27

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