WO2014039796A2 - Labels compatible with recycling - Google Patents

Labels compatible with recycling Download PDF

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Publication number
WO2014039796A2
WO2014039796A2 PCT/US2013/058471 US2013058471W WO2014039796A2 WO 2014039796 A2 WO2014039796 A2 WO 2014039796A2 US 2013058471 W US2013058471 W US 2013058471W WO 2014039796 A2 WO2014039796 A2 WO 2014039796A2
Authority
WO
WIPO (PCT)
Prior art keywords
article
adhesive
facestock
weight percent
face layer
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/US2013/058471
Other languages
English (en)
French (fr)
Other versions
WO2014039796A3 (en
Inventor
Mitchell J. ROCKOVAN
James P. Akeley
Christopher J. Blackwell
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.)
Avery Dennison Corp
Original Assignee
Avery Dennison Corp
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 Avery Dennison Corp filed Critical Avery Dennison Corp
Priority to BR112015005244A priority Critical patent/BR112015005244A8/pt
Priority to IN665KON2015 priority patent/IN2015KN00665A/en
Priority to CA2884357A priority patent/CA2884357A1/en
Priority to CN201380058303.2A priority patent/CN104781361A/zh
Priority to EP13795892.2A priority patent/EP2892963A2/en
Priority to AU2013312373A priority patent/AU2013312373B2/en
Publication of WO2014039796A2 publication Critical patent/WO2014039796A2/en
Publication of WO2014039796A3 publication Critical patent/WO2014039796A3/en
Anticipated expiration legal-status Critical
Ceased 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
    • B32B43/00—Operations specially adapted for layered products and not otherwise provided for, e.g. repairing; Apparatus therefor
    • B32B43/006—Delaminating
    • 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
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1808—C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385—Acrylic polymers
    • 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
    • B32B2272/00—Resin or rubber layer comprising scrap, waste or recycling material
    • 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
    • B32B2307/732—Dimensional properties
    • B32B2307/734—Dimensional stability
    • B32B2307/736—Shrinkable
    • 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
    • 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
    • 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
    • B32B2519/00—Labels, badges
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
    • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
    • C08L2666/26—Natural polymers, natural resins or derivatives thereof according to C08L1/00 - C08L5/00, C08L89/00, C08L93/00, C08L97/00 or C08L99/00
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/334—Applications of adhesives in processes or use of adhesives in the form of films or foils as a label
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/50—Additional features of adhesives in the form of films or foils characterized by process specific features
    • C09J2301/502—Additional features of adhesives in the form of films or foils characterized by process specific features process for debonding adherents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2433/00—Presence of (meth)acrylic polymer
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/08—Fastening or securing by means not forming part of the material of the label itself
    • G09F3/10—Fastening or securing by means not forming part of the material of the label itself by an adhesive layer
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/582—Recycling of unreacted starting or intermediate materials
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/11—Methods of delaminating, per se; i.e., separating at bonding face
    • Y10T156/1111—Using solvent during delaminating [e.g., water dissolving adhesive at bonding face during delamination, etc.]
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2852—Adhesive compositions
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31786—Of polyester [e.g., alkyd, etc.]
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31786—Of polyester [e.g., alkyd, etc.]
    • Y10T428/3179—Next to cellulosic
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31786—Of polyester [e.g., alkyd, etc.]
    • Y10T428/31797—Next to addition polymer from unsaturated monomers

Definitions

  • the present invention relates to adhesive compositions, facestocks a nd/or packaging la bels containing same, where such compositions, facestocks and/or la bels are designed to facilitate the recyclability of a plastic article formed from any suita ble polymer or mixture of polymers (e.g., a polyethylene terephthalate (PET), recycled polyethylene terephthalate (rPET), high density polyethylene (HDPE), polyvinyl chloride (PVC), low density polyethylene (LDPE), polypropylene (PP), polystyrene (PS), polyesters, polylactic acid (PLA), cellulose, biopolymers, composta ble materials, recycled polyesters, or other types of polymers or plastics).
  • PET polyethylene terephthalate
  • rPET recycled polyethylene terephthalate
  • HDPE high density polyethylene
  • PVC polyvinyl chloride
  • LDPE low density polyethylene
  • PP polypropylene
  • PS polystyrene
  • polymer packaging articles particularly those made of thermoplastic polymers
  • the conversion from conventional packaging articles to polymer packaging articles has progressed most rapidly in the beverage industry where plastic, or polymer, packaging articles are used in great quantity.
  • one of the most popular polymer compositions for use in polymer, or plastic, packaging articles is either polyethylene terephthalate (PET) or recycled polyethylene terephthalate (rPET).
  • PET bottles are fitted with various labels, for example, stretch labels made of polyolefins; heat-shrinkable labels made of polyesters, polystyrene, polyvinyl chloride, or other polymers; and tack labels made of polypropylene or other polymers.
  • stretch labels made of polyolefins
  • heat-shrinkable labels made of polyesters, polystyrene, polyvinyl chloride, or other polymers
  • tack labels made of polypropylene or other polymers.
  • PET bottles are then washed, and their labels are removed by primary crushing, at which time, however, the crushed polymer materials may still include a portion of the labels, facestocks, or adhesive used to attach same in great quantity. Therefore, the conversion of PET bottles into recycled polymer pellets may require many intervening steps such as secondary crushing, specific gravity separation of labels in a liquid, dehydration and drying, specific gravity separation of labels by air blowing, and peptization.
  • the present invention relates to adhesive compositions, facestocks and/or packaging labels containing same, where such compositions, facestocks and/or labels are designed to facilitate the recyclability of a plastic article formed from any suita ble polymer or mixture of polymers (e.g., a polyethylene terephthalate (PET), recycled polyethylene terephthalate (rPET), high density polyethylene (HDPE), polyvinyl chloride (PVC), poly lactic acid (PLA), cellulose, biopolymer films, low density polyethylene (LDPE), polypropylene (PP), polystyrene (PS), polyesters, recycled polyesters, or other types of polymers or plastics).
  • a polyethylene terephthalate PET
  • rPET recycled polyethylene terephthalate
  • HDPE high density polyethylene
  • PVC polyvinyl chloride
  • PLA poly lactic acid
  • cellulose biopolymer films
  • LDPE low density polyethylene
  • PP polypropylene
  • PS polysty
  • a method of removing a facestock/adhesive construction from one or more articles to be recycled comprises a step of (a) supplying at least one article to be later recycled, the article having attached thereto at least one facestock/adhesive construction.
  • the facestock adhesive construction includes a face layer formed from a facestock material selected from olefin polymers, polystyrene, PET, rPET, polylactic acid, biopolymers, cellulose, and com binations thereof; and an adhesive layer.
  • the facestock wherein the facestock is a ble to be removed from a plastic or metal article in a manner that ena bles recycling of the plastic or metal article.
  • the method also includes a step of (b) su bjecting the article containing the at least one facestock/adhesive construction to at least one caustic solution until the facestock/adhesive construction releases from the article to be recycled.
  • a facestock/adhesive construction for a plastic or metal article comprises a face layer and an adhesive layer.
  • the face layer is formed from a facestock material selected from paper, olefin polymers, polystyrene, PET, rPET facestocks, polylactic acid, biopolymers, cellulose, and com binations thereof.
  • the facestock is able to be removed from a plastic or metal article in a manner that ena bles recycling of the plastic or metal article.
  • a la beled plastic article comprises at least one plastic article formed from one or more of PET, rPET, a polyester polymer, a recycled polyester polymer, or any com bination of two or more thereof, and the at least one plastic article contains thereon, or therein, at least one la bel formed from a facestock/adhesive construction.
  • the facestock/adhesive construction includes a face layer formed from a facestock material selected from paper, olefin polymers, polystyrene, PET, rPET facestocks, polylactic acid, biopolymers, cellulose, and com binations thereof and an adhesive layer, and the facestock is a ble to be removed from a plastic article in a manner that ena bles recycling of the plastic.
  • a facestock material selected from paper, olefin polymers, polystyrene, PET, rPET facestocks, polylactic acid, biopolymers, cellulose, and com binations thereof and an adhesive layer
  • Figure 1 is a cross-section illustration of a facestock and/or la bel for use on a polymer, or plastic, packaging article in accordance with one embodiment of the present invention
  • Figure 2 is a cross-sectional illustration of a facestock and/or la bel for use on a polymer, or plastic, packaging article in accordance with another embodiment of the present invention
  • Figure 3 is an illustration of the various steps in one example of a plastics recycling process.
  • Figure 4 shows exemplary su bstrates after treatment in a caustic solution as set forth in the disclosure.
  • the present invention relates to adhesive compositions, facestocks a nd/or packaging la bels containing same, where such compositions, facestocks and/or la bels are designed to facilitate the recyclability of a plastic article formed from any suita ble polymer or mixture of polymers (e.g., a polyethylene terephthalate (PET), recycled polyethylene terephthalate (rPET), high density polyethylene (HDPE), polyvinyl chloride (PVC), low density polyethylene (LDPE), polypropylene (PP), polystyrene (PS), polylacticacid (PLA), biopolymers, cellulose, polyesters, recycled polyesters, or other types of polymers or plastics).
  • PET polyethylene terephthalate
  • rPET recycled polyethylene terephthalate
  • HDPE high density polyethylene
  • PVC polyvinyl chloride
  • LDPE low density polyethylene
  • PP polypropylene
  • PS polystyrene
  • PLA polylacticacid
  • the polymer or mixture of polymers may be composta ble.
  • the articles may be cold filled or hot filled, and the facestocks and/or la bels may be applied to the articles days after the articles molded, in line with article production, or within minutes of the articles being made.
  • the present invention relates to a method for removing an adhesive composition, facestock and/or packaging label containing same, from a plastic article that is to be recycled and/or subjected to multi- generational recycling.
  • PETs polyethylene terephthalates
  • PETs include, but are not limited to, low or high intrinsic viscosity PET, amorphous PET (A-PET), un-oriented and oriented PET, and crystallized PET.
  • A-PET amorphous PET
  • PET un-oriented and oriented PET
  • crystallized PET Alternatively or additionally, multilayer compositions of PET including ethylene vinyl alcohol (EVOH) and/or nylon for enhancing barrier properties, or polyethylene naphthalate (PEN) as the polymer.
  • EVOH ethylene vinyl alcohol
  • PEN polyethylene naphthalate
  • also of interest is the ability to utilize recycled PET (or rPET) and then subject this material to further recycling.
  • the present invention utilizes an adhesive composition that is compatible with both the underlying polymer, or plastic, compound of the polymer, or plastic, packaging article and compatible with the backmost facing layer of the facestock and/or label that is to be applied to the polymer, or plastic, packaging article.
  • the present invention utilizes an adhesive composition that is both compatible with an underlying polyester, or recycled polyester, article and compatible with the backmost facing layer of the facestock and/or label that is to be applied to the polyester, or recycled polyester, article. Given this, the present invention will be described generically in relation to a plastic, or polymer, article.
  • rPET refers to packing or other materials of any type made partly or wholly from recycled PET (i.e., rPET).
  • rPET recycled PET
  • multi-generational recycling of such packing or other materials that contain, in whole or in part, rPET and/or one or more recycled polyesters.
  • the present invention is directed to an adhesive composition that when utilized in conjunction with a facestock and/or label on a polymer, or plastic, packaging article permits the efficient and cost effective recycling of the polymer, or plastic, packaging article.
  • the polymer, or plastic, packaging article can be any type of article including, but not limited to, bottles, containers, clam shell containers, flexible packaging containers, food containers, non-food item containers, etc. It may also have applicability in non-plastic containers such as those formed from one or more metals or metal alloys.
  • any adhesive composition that can be readily dissolved, dissociated, or causes the adhesive composition to release from an underlying polymer, or plastic, surface can be utilized in conjunction with the present invention.
  • the adhesive utilized in conjunction with the present invention has sufficient adhesion at both cold and warm temperatures.
  • the adhesive composition utilized in conjunction with the present invention should possess compatibility with the underlying polymer, or plastic, compound of the polymer, or plastic, packaging article as well as with the backmost facing layer of the facestock and/or label that is to be applied to the polymer, or plastic, packaging article.
  • the adhesive compound selected for use in conjunction with the present invention leaves no residue on the plastic surface that would require one or more further processing steps to remove such residue from the surface of the polymer, or plastic, packaging article prior to the recycling thereof.
  • a suitable adhesive is selected from suitable tacky acrylic emulsion adhesive polymers that possess excellent adhesion to a wide variety of surfaces, including a wide range of polymer surfaces as well as non-polymer surfaces (e.g., stainless steel and corrugated board). Moreover, the emulsion adhesive polymers of this embodiment possess excellent cohesion and adhesion at low temperatures and, when part of a laminate stock such as pressure-sensitive adhesive label stock, provide excellent high-speed converting characteristics such as die cutting, matrix stripping and fan folding. [00021] In one embodiment, additional suitable emulsion polymers for use as an adhesive in the present invention are disclosed in United States Patent Nos. 5,164,444; 5,183,459; 5,189,126; 5,264,532; 5,278,227, the complete disclosures of which are incorporated in their entireties herein.
  • a suitable adhesive for the present invention is a copolymer composition formed via an emulsion process from a mixture of reactants comprising at least one alkyl acrylate ester of an alcohol containing at least 4 carbon atoms in the alkyl chain, at least one polar monomer and at least one copolymerizable monomer selected from methyl acrylate, MMA, EA, VAc, and combinations of two or more thereof, wherein the reaction includes a chain transfer agent.
  • the adhesive composition for use in conjunction with the present invention is an acrylic emulsion polymer system comprised of a copolymer of about 15 weight percent to about 35 weight percent of vinyl acetate, about 20 weight percent to about 40 weight percent of di-2-ethylhexyl maleate, about 35 weight percent to about 60 weight percent 2-ethylhexyl acrylate and about 1 weight percent to about 3 weight percent of one or more unsaturated carboxylic acids for each 100 parts by weight of polymer, and about 3 weight percent to about 20 weight percent of acidic rosin derivative provided as tackifier and about 1 weight percent to about 10 weight percent of a rosin-based surfactant (e.g., an ethoxylated rosin based surfactant) based on 100 parts of the adhesive composition.
  • a rosin-based surfactant e.g., an ethoxylated rosin based surfactant
  • the adhesive utilized herein contains a rosin-based additive that that is selected based on the rosin-based additive's ability to liquefy at the typical temperatures utilized in various caustic washing steps that are a part of various recycling processes.
  • Suitable rosin-based additives for use in this embodiment include the various rosin-based additives detailed in United States Patent No. 5,385,965.
  • the adhesive may contain a blend of anionic and ionic surfactants in the adhesive ranging between 4 weight percent and 7 weight percent based on 100 parts of adhesive composition.
  • the blend of surfactants may be contain alkyl phenol ethoxylates, nonyl phenol ethoxylates, salts of ethenesulfonic acid, fatty alcohol ether sulfates, sulfosuccinates, and combinations thereof.
  • Commercially available, non-limiting examples of such surfactants include Polystep B-27, from Stepan Company, Disponil FES 77 and Disponil FES 32, from BASF, and Hydropalat 875, from BASF.
  • the adhesive composition for use in conjunction with the present invention is selected based on the ability of a caustic wash (e.g., a caustic wash utilizing NaOH) to dissolve, dissociate, or cause the adhesive composition to release from an underlying polymer, or plastic, surface without the need for further processing steps to render the underlying polymer, or plastic, packaging article suitable for a recycling process.
  • the adhesive can come from the group of solvent adhesives, emulsion adhesives, cold stick adhesives, radiation curable adhesives, and hot melt adhesives or any combination or layer combination of the above.
  • the amount of the overall label material, the label's adhesive material, and/or the label's facestock material left on the recycled article is substantially reduced and/or eliminated.
  • the present invention is not limited to any one caustic wash process.
  • any suitable caustic wash process can be utilized in conjunction with the present invention.
  • Such caustic washes include, but are not limited to, NaOH, KOH, LiOH, MgOH, CaOH, or suitable mixtures of two or more thereof.
  • the concentration of the caustic material in the caustic solution is 10% or less. More specifically, the concentration of the caustic material may be 7% or less, or may be 2.5% or less. Still more specifically, the concentration of the caustic material may be 2.0%.
  • the density of the caustic wash solution will be different from the densities of both the labeled article and the label in order to facilitate floating and/or sinking of the article and label, depending on the relative densities, as well as the means by which the materials are separated from the caustic solution.
  • the caustic solution may also contain other agents to aid in the effectiveness of the caustic solution such as Triton X-100.
  • Triton X-100 (Ci 4 H 22 0(C 2 l-l 4 0) n ) is a nonionic surfactant which has a hydrophilic polyethylene oxide group (on average it has 9.5 ethylene oxide units) and a hydrocarbon lipophilic or hydrophobic group.
  • the hydrocarbon group is a 4-(l,l,3,3-tetramethylbutyl)-phenyl group. It is related to the Pluronic range of detergents marketed by BASF.
  • the pluronics are triblock copolymers of ethylene oxide and propylene oxide. The part formed from ethylene oxide is more hydrophilic than the part from propylene oxide.
  • Triton X-100 is very viscous at room temperature and is thus easiest to use after being gently warmed.
  • an agitation speed of 1500 rpm or less, or more specifically 300-1200 rpm, or even more specifically 600-1200 rpm, or still more specifically 900-1200 rpm increases the release behavior of the facestock and/or label from the labeled article.
  • a wash time range between 1 and 15 minutes, or specifically between 5 and 15 minutes, or more specifically between 10 and 15 minutes, or even more specifically a period of 15 minutes also increases the release behavior of the facestock and/or label from the labeled article.
  • the wash time may last up to 30 minutes, or may last up to an hour.
  • the combination of each range of wash temperature, agitation speed, wash time, and caustic material concentration disclosed are contemplated in the facestock and/or label removal methods disclosed herein.
  • Figure 1 is a cross-section illustration of a facestock and/or label 100 for use on a polymer, or plastic, packaging article in accordance with one embodiment of the present invention.
  • Label 100 is comprised of at least two layers, a print, or face, layer 102 and an adhesive layer 104.
  • Adhesive layer 104 is, as discussed above, selected based on the ability of a caustic wash (e.g., a caustic wash utilizing NaOH) to dissolve, dissociate, or cause the adhesive composition to release from an underlying polymer, or plastic, surface without the need for further processing steps to render the underlying polymer, or plastic, packaging article suitable for a recycling process.
  • a caustic wash e.g., a caustic wash utilizing NaOH
  • label 100 can further include one or more layers additional non-disclosed layers or one or more additives to any layer present that either facilitate the use of a caustic wash to remove label 100 from the packaging material that is destined for recycling, or that impart a useful property or characteristic to label 100 (e.g., printability, UV-resistance, etc.).
  • additional additive materials include, but are not limited to, any suitable type of surfactant (e.g., one or more nonionic surfactants, one or more ionic surfactants, one or more amphoteric surfactants, or suitable combinations thereof), polymer processing aids, UV-protectants, etc.
  • a suitable surfactant is Triton X-100.
  • the pH of the adhesive material should be selected such that the caustic material utilized in the wash process is able to dissolve, dissociate, or cause the adhesive composition to release from an underlying polymer, or plastic, surface without the need for further processing steps to render the underlying polymer, or plastic, packaging article suitable for a recycling process.
  • the pH of the adhesive material is between about 7 and about 14.
  • an adhesive having the reverse pH range i.e., a pH in the range of about 0 to about 7
  • an adhesive composition is selected for layer 104 such that the adhesive layer will both release from the plastic, or metal, article to be recycled but remain attached to layer 102 of the facestock when exposed to one or more recycling processing solutions (i.e., one or more caustic solutions).
  • such an adhesive composition permits removal of the facestock of the present invention from the plastic, or metal, article to be recycled via dissociation while remaining attached to layer 102 of the facestock thereby ensuring that the adhesive composition of the present invention does not enter and/or contaminate the recycling stream.
  • one additional factor that can be considered when selecting an adhesive composition for layer 104 is whether the adhesive composition is hydrophilic. Adhesives with compositions that yield hydrophilic properties will allow for absorption of water and the caustic solution, and aid in the speed of dissociation of the adhesive.
  • an adhesive composition with a low adhesion at an elevated temperature of more than about 50°C, or more than about 55°C, or more than about 60°C, or even more than about 65°C, is utilized.
  • the advantage of using an adhesive composition with a low adhesion, or tack, at an elevated temperature is that this facilitates the adhesive to release when the polymer, or plastic, packaging article is subjected to the initial process to remove the packaging label prior to recycling of the underlying package.
  • layer 102 is selected so that the permeability, integrity and/or chemical properties thereof are selected so that the caustic material utilized to remove facestock 100 will sufficiently permeate through and/or around layer 102 so as to reach a suitable amount of the adhesive in layer 104 in order to facilitate the dissociation, or release, of layer 104 from the surface of the polymer, or plastic, packaging article in a desired amount of time. Also of consideration in the choice of layer 102 is to make sure that the choice of material utilized in layer 102 permits enough of, or all of, the adhesive composition in layer 104 to be removed from the surface of the polymer, or plastic, packaging article.
  • layer 102 can be formed from any suitable polymeric or paper facestock material.
  • suitable polymeric or paper facestock material include, but are not limited to, olefin polymer facestocks (e.g., polyethylene facestocks, polypropylene facestocks, etc.), polystyrene facestocks, PET facestocks, or rPET facestocks.
  • the facestocks of the present invention can be unaxially oriented, biaxially oriented, or unoriented.
  • layer 102 can be formed from two or more individual layers with the material utilized to form each layer being appropriately selected from those listed above.
  • layer 102 can contain a topcoat layer, a print layer, and any suitable number of intermediate layers (not shown) prior to being attached to the upper, or top, surface of adhesive layer 104.
  • the bottom surface of adhesive layer 104 can have a release liner attached thereto prior to placement of facestock 100 on a desired surface of a polymer, or plastic, packaging article. Suitable release liner materials include, but are not limited to, those detailed in United States Patent No. 5,084,317 the disclosure of which is incorporated herein in its entirety.
  • any suitable release liner material, or construction, that is designed for use with olefin-, PET-, or rPET-based facestocks can be utilized in conjunction with the present invention.
  • the release line of the present invention can be any material that is suitable for use in conjunction with the one or more adhesive materials disclosed above.
  • FIG. 1 is a cross-sectional illustration of a facestock and/or label for use on a polymer, or plastic, packaging article in accordance with another embodiment of the present invention.
  • facestock 200 further contains a topcoat layer 206 and a release liner 208.
  • any layers in the facestocks of the present invention can be varied as desired depending upon a number of factors including, but not limited to, facestock construction, the intended use of the facestock, the material utilized to produce the various layers of a facestock, etc.
  • the bottom surface of adhesive layer 104 can have formed therein various micro-channels to permit the inflow, via capillary action, of a caustic material when the adhesive layer is placed on a surface of a polymer, or plastic, packaging article.
  • the outer surface, or a portion thereof, of the polymer, or plastic, packaging article can have various micro-channels, micro-perforations, cavitation, or micro-patterns, to permit the inflow, via capillary action, of a caustic material to the underside of adhesive layer 104 when layer 104 is placed there over.
  • the surface of the polymer, or plastic, packaging article can have an appropriate lack of smoothness so as to facilitate the release of the adhesive material in layer 104 from the surface of the polymer, or plastic, packaging article.
  • the polymer, or plastic, packaging article can contain therein a release agent (e.g., a silicon release agent) that can be activate by the caustic wash and thereby aid in the removal of the adhesive material in layer 104 from the surface of the polymer, or plastic, packaging article.
  • a release agent e.g., a silicon release agent
  • At least one layer of facestock and/or label 100 and/or 200 are selected to have a density less than that of the substrate to which such a facestock and/or label is to be affixed.
  • at least the adhesive layer 104 and the face, or print, layer 102 of facestock and/or label 100 and/or 200 are selected to have a density less than that of the substrate to which such a facestock and/or label is to be affixed.
  • all of the layers in facestock and/or label 100 and/or 200 are selected to have a density less than that of the substrate to which such a facestock and/or label is to be affixed.
  • the density of at least one layer of facestock and/or label 100 and/or 200 is selected to have a density less than that of water (i.e., less than about 1.0 g/mL).
  • the density of the adhesive layer 104 and the face, or print, layer 102 of facestock and/or label 100 and/or 200 are selected to have a density less than that of water (i.e., less than about 1.0 g/mL).
  • all of the layers in facestock and/or label 100 and/or 200 are selected to have a density less than that of water (i.e., less than about 1.0 g/mL).
  • the present invention makes possible the removal of a facestock, or label from the surface of a polymer, or plastic, packaging article via the use of a single caustic wash step.
  • control bottle which is an rPET bottle with no label attached thereto and two bottles each with a label attached thereto.
  • the label utilized is formed from white biaxially oriented polypropylene (BOPP) and the adhesive is AE-3339.
  • BOPP white biaxially oriented polypropylene
  • the Control bottle and the labeled bottles are tested using the a process that is in accordance with the process set forth in "Critical Issues Guidance for Innovations 'PET Bottle Critical Guidance Document'" last revised May 2, 2011 document, Association of Postconsumer Plastic Recyclers (APR) (www.plasticsrecycling.org).
  • APR Association of Postconsumer Plastic Recyclers
  • Recycle System the recycle system that is used in conjunction with this example of the present invention is a pilot plant wash system that is designed to process five pound batches of material.
  • the system utilizes convection ovens to conduct and/or facilitate surface drying, a Kice Elutriator, a grinder with 3/8" screen, a Walton/Stout Desiccant Dryer, an Arburg Injection Press with a 3MM plaque mold, and a Konica Minolta Spectrophotometer.
  • the procedure used to conduct the recycling test began with grinding the Control bottle (control material) and the labeled bottle (test material) separately and then processing ground material from each respective bottle separately through the pilot recycle process including a first wash (a pre-wash) and a second wash (a post wash) elutriation passes.
  • the test material flakes were washed according to APR standard protocol. This includes washing the material with a caustic wash as detailed below. The material was then rinsed and dried in ambient air flow. The process conditions for both the control material and test material were identical.
  • Example 1 and Sample 2 The requisite amount of ground up material from each respective label bottle (Sample 1 and Sample 2) was blended at various with ground up material from the Control (non-labeled) bottle to yield three test samples having the following levels of ground up labeled test material - 0 weight percent, 25 weight percent and 50 weight percent. Next, these three samples were subject to various tests as described below.
  • Tables 1 and 2 detail plaque analysis data for both the control material and the sample materials generated from two different labeled bottles (that is the blends of the control material with 25 weight percent and 50 weight percent test material from Sample 1 and Sample 2).
  • Control and sample material flakes were injection molded using a 78 ton Arburg injection machine with a 3 mm plaque cavity mold.
  • the resulting plaques were analyzed using specifications from the APR Critical Guidance Document.
  • the test protocol requires that absolute L* values be greater than 82, absolute haze value less than 9.5% and the calculated difference or Delta value (Ab*) of the b* be less than 1.5 units when compared to the control.
  • Table 3 [00053] As shown in Table 3, the removal of the test labels from the flake material was illustrated through two elutriations and the sink/float process in the table above. The first elutriation for Label Sample 1 was greater than that of Label Sample 2 and as such there appears to be more fine PET particles present in the Label Sample l's elutriated materials. The labels all removed similarly in the second elutriation and sink/float steps. The labels removed in large amounts during the sink/float step and a visual inspection of the flakes shows little to no remaining labels in the materials. The molded plaques show what could be expected from a product made of recycled material. Using the APR CGD as a base for plaque coloration based off the control, both variables have acceptable color values as well as acceptable haze values. Accordingly, nearly all of the label flakes were removed efficiently through the sink/float and elutriation processing.
  • Table 4 details a comparison between a control (an rPET bottle with no label attached thereto) and a bottle with a label attached thereto.
  • the label utilized is formed from white biaxially oriented polypropylene (BOPP) and the adhesive is AE-3339.
  • the label has no printing on it and is about 8 square inches in size with a label thickness of 0.003 inches.
  • the Control bottle and the labeled bottle are tested using the a process that is in accordance with the process set forth in "Critical Issues Guidance for Innovations 'PET Bottle Critical Guidance Document'" last revised May 2, 2011 document, Association of Postconsumer Plastic Recyclers (APR) (www.plasticsrecycling.org).
  • APR Association of Postconsumer Plastic Recyclers
  • Figure 3 is an illustration of one example of a plastics recycling process. As would be apparent to those of skill in the art, the present invention is not limited to solely the recycling process detailed in annotated Figure 3. [00056] Table 4
  • PET and PS containers were cut into suitably sized squares for observation using 2 x 2 inch dies, with representative specimens taken from the flat section on the lid of a suitable container. Each specimen was submerged in the caustic wash solution heated to 85°C for 15 minutes, then removed, rinsed with water to remove residual caustic wash solution, and measured along each length and width. The data, including calculated area, is collected and shown in Table 5. [00059] Table 5
  • the caustic solution used in these examples was a 3 gallon solution of 0.1 percent NaOH that is formed from mixing 125 grams NaOH pellets with 12,376 grams of water in 5 gallon pail by adding the water in twelve 1000 gram increments and then adding the last 376 grams of water.
  • a surfactant was then added at a concentration 0.3 percent by volume by adding 35.27 mL of TRITON X- 100 to 100 grams of water and then the resulting mixture to the 0.1 percent solution of NaOH was added to the 5 gallon pail.
  • the resulting mixture was then gently stirred with a steel rod (mixing blade) to ensure that the Triton- X 100 was thoroughly dispersed in the solution.
  • the shrinkage value of the face layer or face stock is less than 5%.
  • PET thermoform e.g. PET thermoform
  • the adhesive contained a rosin based surfactant component with an unique cloud point such that it was a waxy solid at room temp but liquefied at 110°F.
  • the shrink force of the films is lower than the adhesive peel force.
  • the film shrink force is not sufficient to overcome the adhesive retention force and accordingly is not the force driving the release of the label/facestock from the labeled article. While not wishing to be bound to any one theory, it is believed that the shrink force of the substrates in combination with the shrink force of the labels/facestocks facilitate the dissolution of the adhesive from the substrate at the interface between the two components.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Wrappers (AREA)
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US10131130B2 (en) 2018-11-20
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US20140069587A1 (en) 2014-03-13
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