EP1070173A1 - Revetement a base aqueuse recepteur d'image et son procede de preparation - Google Patents

Revetement a base aqueuse recepteur d'image et son procede de preparation

Info

Publication number
EP1070173A1
EP1070173A1 EP98915372A EP98915372A EP1070173A1 EP 1070173 A1 EP1070173 A1 EP 1070173A1 EP 98915372 A EP98915372 A EP 98915372A EP 98915372 A EP98915372 A EP 98915372A EP 1070173 A1 EP1070173 A1 EP 1070173A1
Authority
EP
European Patent Office
Prior art keywords
poly
coating
sheet material
porous
coated sheet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98915372A
Other languages
German (de)
English (en)
Inventor
Derric T. Overcash
Richard C. Wallace
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.)
AWare Technologies LC
Original Assignee
AWare Technologies LC
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 AWare Technologies LC filed Critical AWare Technologies LC
Publication of EP1070173A1 publication Critical patent/EP1070173A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0272—Substrate bearing the hologram
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/024—Hologram nature or properties
    • G03H1/0244—Surface relief holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/18—Particular processing of hologram record carriers, e.g. for obtaining blazed holograms
    • G03H2001/185—Applying a curing step
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2250/00—Laminate comprising a hologram layer
    • G03H2250/39—Protective layer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2270/00—Substrate bearing the hologram
    • G03H2270/10—Composition
    • G03H2270/12—Fibrous, e.g. paper, textile
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2270/00—Substrate bearing the hologram
    • G03H2270/10—Composition
    • G03H2270/14—Plastic

Definitions

  • This invention relates to an economical coating composition for porous substrates that provides extremely glossy surfaces, is capable of supporting holographic images, provides good oxygen barrier properties as well as good oil, grease, solvent and water resistance.
  • Said coatings on paper substrates are printable, biodegradable, recyclable, and repulpable. They are also suitable for use in conjunction with food products.
  • This invention also relates to a process for applying said coatings onto porous substrates as well as a process for the economical production of inexpensive holographic images on substrates such as paper and cardboard containers.
  • holographic or 3- dimensional graphical images and high gloss paper and high gloss white paper substrates have been desirable to produce holographic or 3- dimensional graphical images and high gloss paper and high gloss white paper substrates on packaging, marketing, and promotional materials more economically than by manufacturing processes that are currently available.
  • These holographic or 3 -dimensional graphical images provide multiple color (rainbow) like affects on the these packaging, promotional, and marketing materials.
  • the high gloss paper and high gloss white paper affects enhance the surface appearance of an otherwise unattractive substrate. These affects appeal to consumers and enhance the products or promotional image. Economics of the current process has deterred many in the highly competitive markets not to include or utilize holographic affects in their marketing or promotional packages. High gloss paper and high gloss white paper substrates are also not economically attractive.
  • a holographic pattern or design is selected is then embossed onto the surface of a cylinder or plate.
  • Laser etching has also been introduced into the market.
  • the roller or plate then is used to emboss or impress the holographic image of the roller or plate onto a high gloss smooth surface such as polyester, polyvinyl chloride, polypropylene, polystyrene or polyethylene.
  • the holographic image is impressed into a semi-soft or hard coating which was coated onto the polyester.
  • This non aqueous based coating is typically 100% polyurethane .
  • This embossed coating can be transferred with the holographic image or bonded permanently to the carrier depended upon which side of printing was preferred to enhance the holographic image.
  • embossed holographic image surfaces can be and are typically put through a Vacuum Metal Deposition ' process, where a certain amount of aluminum is vaporized and redeposited as a solid onto the embossed holographic surface. Highly reflective or dark inks are also utilized to reflect the light to achieve similar effects. This light reflection or mirror image behind the embossed holographic surface then gives a highly glossy attractive 3 -dimensional graphical image or holographic image . The mirror surface behind the embossed surface reflects light that provides the holographic effect. This metallizing process is fast and cost effective.
  • This embossed highly glossy smooth holographic 3-dimensional metallized surface is usually then laminated to various papers or itself and other materials and or formed into packages for the consumer to enhance product appeal.
  • typically paper mills and or paper converters laminate polymer films such as, but not limited to, polyester, polypropylene, or polyethylene to various paper substrates .
  • Another process to achieve barrier properties and high gloss is to extrude polyethylene and/or polyethylene teraphthalate onto paper surfaces. Both the laminate materials and extrusion materials are not biodegradable, recyclable, or repulpable.
  • holographic 3- dimensional metallized products high gloss papers, and high gloss white paper substrates suitable for use in consumer packaging.
  • a holographic 3 -dimensional metallized product, a high gloss paper, and a high gloss white paper substrate that can be biodegradable, recyclable and repulpable in current reclamation systems that exists today.
  • the current holographic 3 -dimensional metallized, extruded and laminated polyolefins, polyesters and urethanes are not recyclable, repulpable, or biodegradable in their usual forms.
  • Figure 1 represents a cross-sectional perspective view of a holographic embossed and nonholographic embossed carrier substrate with coated material embodying the present invention.
  • Figure 2 represents a cross-sectional perspective view of a transfer coated holographic sheet material embodying the present invention in flat sheet form.
  • Figure 3 represents a cross-sectional perspective view of a transfer coated high gloss sheet material embodying the present invention in flat sheet form.
  • the substrate material is comprised of a porous substrate material, and an image receptive holographic or non-holographic, smooth, non- porous, high gloss barrier coating layer comprising
  • a grease-resistant, water resistant, water dispersible, film forming polymer (ii) a grease-resistant, water resistant, water dispersible, film forming polymer.
  • Said coating formulation may optionally comprise a release layer.
  • the image receptive barrier coating may also, include fillers, clays, micas, pigments, dyes, waxes, fatty acids, slip agents, wetting agents., defoamers, and dispersing agents.
  • Suitable substrate sheet materials are preferably porous, and therefore not impervious to water and oil, and may vary widely. These include substrates comprised of non-woven and woven polymers such as fabrics, porous clays such as clay baking containers, metal oxide aerogels, and cellulose-based materials, such as paper and cardboard substrates, and the like.
  • One preferred embodiment of the present invention comprises a porous sheet material made of a cellulose material, or a cellulose-based material, such as paper or paper-like materials.
  • Such paper sheet materials include, for example, corrugated paperboard (or "cardboard"), newsprint paper, uncorrugated Kraft paper stock, pan liner paper stock, and the like.
  • cellulose-based sheet materials such as pressed board
  • other cellulose-based sheet materials such as pressed board
  • fibrous materials for the substrate sheet material.
  • the choice of substrate will depend on economic concerns -- low cost substrates being preferred in this regard — and the intended use of the coated sheet material.
  • an 18 point virgin hardwood Kraft liner board is one preferred but not limited to substrate.
  • a non-porous substrate carrier material A having oppositely disposed surfaces D and DI, surface D having high gloss, smooth, non-porous and non-adherent, untreated or treated, non-embossed or non-holographic surface, surface DI having high gloss, non-porous and non- adherent, treated or untreated, holographic embossed or etched image or pattern, first coated on surface DI with a image receptive barrier coating composition B.
  • the image receptive barrier coating composition B may be applied, as a solution or dispersion, by roll coater, Myar rod, engraved roll, gravure roller, air knife, brush, doctor blade or blade coater, sprayer, dip coating, or other such suitable application means; however, in the manufacturing context, it will presumably be preferable to use a gravure roller or Myar Rod application.
  • the viscosity of the coating composition B ranges from about 100 to 1000 cps (#4 Spindle) , more preferably from about 250 - 750 cps (#4 Spindle), and most preferably about 300 -400 cps (#4 Spindle) .
  • the image receptive barrier coating B is applied in sufficient amounts to achieve the performance levels desired by the end materials. Preferably, it is applied at a rate of about 0.4 - 12 lbs per 1000 square feet onto the non-porous carrier holographic image surface DI, more preferably at a rate about 2 - 8 lbs. per 1000 square feet of substrate, and most preferably at a rate of about 4 - 7 lbs per 1000 square feet.
  • the coated non-porous support carrier A with the holographic embossed surface DI with 7 image receptive barrier coating B is then partially cured or fully cured.
  • the holographic embossed image carrier substrate sheet material A with image receptive barrier coating B after curing is then put through a transfer or lamination process.
  • This transferring or lamination process transfers the barrier coating B with its cast image of the carrier surface from the non-porous, holographic embossed image carrier substrate A surface DI, to the substrate material F.
  • the non-porous, holographic embossed image substrate sheet material A is removed, thus transferring the coating B, with a casting of the holographic embossed image of surface D 1, to substrate material F.
  • the image receptive barrier coating C is deposited onto the high gloss, non-porous and non-adherent, untreated or treated, non embossed or non-holographic surface D.
  • the image receptive barrier coating composition C may be applied, as a solution or dispersion, by roll coater, Myar rod, engraved roll, gravure roll, air knife, brush, doctor blade or blade coater, sprayer dip coating, or other such suitable applications means; however, in the manufacturing context, it will presumably be preferable to use gravure roller or Myer rod application.
  • the viscosity of the coating composition C is from 100 - 1000 cps (#4 Spindle) , more preferably about 300 - 800 cps (4# Spindle) , and most preferably about 300 - 400 cps (#4 Spindle) .
  • it is applied at a rate of about 0.3 -13 lbs per 1000 square feet onto the non-porous, non-holographic, high gloss surface D, more preferably at a rate of about 3 - 9 lbs per 1000 square feet of non-porous support material, and most preferably at a rate of about 4 -8 lbs per 1000 square feet.
  • the substrate A with the non-holographic high gloss surface D with image receptive barrier coating composition C is then partially cured or fully cured.
  • the non- holographic, high gloss carrier substrate sheet material A with image receptive barrier coating C is then put through a transfer or lamination process. This transferring or lamination process transfers the image receptive barrier coating C from the non-porous, smooth, high gloss, carrier substrate A surface D, to the porous substrate material G.
  • the carrier substrate A is then removed, thus transferring the high gloss, smooth, non-holographic barrier coating C with the image of smooth surface D to the porous substrate material G.
  • Suitable methods to effect the transfer process are known in the art and include hot pressing and the use of heated pressure rollers.
  • Suitable carrier substrate materials include polyester films, polycarbonate films, polyurethane films, metal sheets and films, metal rollers and drums, and the like. It is preferred that substrates have rigid surfaces so as to maintain their shape on repeated use. The surfaces of these carrier substrates in the practice of this invention are critical. To obtain high gloss coatings, the surface of the carrier should be very smooth and uniform. On the other hand, when and image, such as a holographic image, is desired in the final coating, then the surface of the carrier must be embossed or etched with the pattern that is desired to be cast into the coating of the present invention.
  • image receptive barrier coating-transfer process within the scope of this invention are possible.
  • Advantages of such a image receptive barrier coating-transfer process include: the ability to reuse the non-porous and non-adherent, smooth, treated or untreated, holographic embossed or etched, or non-holographic high gloss surface flexible support carrier multiple times (e.g.
  • the image receptive barrier coatings of the present invention comprise (i) a cross-linkable polymer resistant to moisture, and (ii) a grease resistant, water resistant, water-dispersible, film forming polymer.
  • the ratio of water-dispersible, film-forming polymer to cross-linkable polymer in the barrier coating composition by weight of the solids of each polymer can vary widely, but is preferably between about 0.25: 1 and about 1: 1.
  • Such compositions are preferably applied to a non-porous, holographic image embossed or etched, or high gloss flexible substrate carrier material as part of a solution or dispersion.
  • Crosslinkable resins are preferred in order to resist penetration by water moisture into the substrate sheet material as well as to permanently retain the image of the carrier surface.
  • One preferred class of cross-linkable resins includes dialdehyde resins.
  • Preferred cross-linkable dialdehyde resins include GlyoxalTM 40 N, 10 made by Hoechst Celanese.
  • polyamine- epichlorohrydrins (PAEs) have been found to function suitably as cross-linkable polymers in the image receptive barrier coating composition, including such PAEs as PolycupTM 172 LX, made by Hercules Corporation. Blends and/or copolymers of cross-linkable polymers may also be used.
  • cross-linkable polymers such as polyvinyl alcohols, carboxylated polyvinyl acetates, polyurethane polymers, acrylic resins, styrene-butadiene resins, ammonium zirconium carbonate containing resins, chrome complexes and various fluorochemical polymers, may also provide the necessary barrier properties.
  • the cross-linkable polymer preferably has a molecular weight, before curing, of greater than about 5,000. After curing, when the cross-linkable polymer is cross-linked (i.e., when monomer or co-monomer repeat units in adjacent polymer chains are chemically linked) , the molecular weight of the polymer may be about 20,000 to 40,000 or greater.
  • the cross-linkable polymer after curing, preferably crosslinks to an extent so as to retain its shape and provide the desired water moisture barrier properties, but not to the extent the material cannot be recycled, rendered biodegradeable, or repulpable.
  • the degree of the crosslinking is between about 0.25% and about 15%, and more preferably between about 0.5% and about 5%, as expressed by the average weight percentage of monomer or co-monomer repeat units in the polymer that are crosslinked.
  • Exemplary polymers useful as cross-linkable polymers resistant to water moisture in the image receptive barrier coating composition include but are not limited to: polymers and copolymers of poly(dienes) such as poly (butadiene) , poly (isoprene) , and poly (1-pentenylene) ; polyacrylics and polyacrylic acids such as poly(benzyl acrylate), poly (butylacrylate) (s) , poly(2- cyanobutyl acrylate), poly (2-ethoxyethyl acrylate), poly (ethylacrylate) , 10 poly (2-ethylhexyl acrylate), poly (fluoromethyl acrylate), poly (5 , 5, 6 , 6 , 7, 7, 7- 11 heptafluoro-3- oxaheptyl acrylate) , poly(heptyl acrylate), poly(hexyl acrylate), poly (isobornyl .
  • poly(dienes) such as poly (
  • polyacrylamides such as poly (acrylamide) , poly(N- butylacrylamide) , poly(N dibutylacrylamide) , poly(N- dodecylacrylamide) , poly (morpholyacrylamide) ; polymethacrylic acids and poly (methacrylic acid esters) such as poly (benzyl methacrylate), poly(octyl methacrylate), poly(butyl methacrylate), poly(2- chloroethyl methacrylate), poly (2-cyanoethyl methacrylate), polydodecyl methacrylate), poly (2- ethylhex
  • polyvinyl esters such as poly (vinyl acetate), poly (benzoyloxyethylene) , poly4-butyryl- oxybenzoyloxyethylene) , poly (4-ethylbenzoyloxyethylene) , poly [ (trifluoroacetoxy) ethylene], poly [ (beptafluorobutyryloxy) ethylene] , poly (formyloxyedlylene) , poly [ (2-methoxy benzoyloxy) ethylene] , poly (pivaloyloxyethylene) , and poly (propionlyoxyethylene) ; and hydrolyzed or partially hydrolyzed versions thereof, such as poly (hydroxyethylene-co acetoxyethylene) , poly (hydroxyediylene-co-formyloxyethylene) , poly (vinyl alcohol) , and the like; other vinyl polymers, such as poly (vinylpyrrolidone) and the like; hydroxyl containing polymers, such as poly (butylene alcohol), poly (propylene
  • polyanhydrides such as poly (oxycarbonyl- 1,4- phenylenemethylene-1,4 -phenylene-carbonyl) , poly (oxyisophthaloyl) , poly(maleic anhydride), copolymers and hydrolyzed versions thereof; polyurethanes such as poly (oxcarbonyhminohexamethylene- iminocarbonyloxydecamethylene) , poly (oxyethyleneoxycarbonyUminio- hexamethyleneiminocarbonyl) , poly (oxyethyleneoxycarbonyhmino- 1,4- phenylenetrimediylene 1, 4-phenyleneiminocarbonyl) , and poly (oxytetramethylene-oxycarbonyhmino- 1,4- phenylenemethylene-1, 4-phenyleneiminocarbonyl)
  • cross-cross-linkable polymer resistant to penetration by water moisture
  • any suitable means such as by heat, visible light radiation or UV, or by the use of gamma rays, x-rays, or electron beams, or by the use of high energy radiation, or exposure to air, or by corona discharge, or by addition of a chemical cross-linking agent.
  • Heating the barrier coating composition after application onto the flexible carrier substrate will generally speed up the crosslinking process.
  • crossing-linking agents are compositions containing high valent metal ions, such as iron(+3), titanium (+4), chromium (+3) , and the like.
  • QuilonTM (Dupont) formulations containing chromium (+3) complexes of 1 6 fatty acids are suitable crosslinking agents. It can be appreciated by those skilled in the art that the choice of suitable crosslinking agent or method will depend on the nature of the cross-linkable polymer chosen for a particular application.
  • water-dispersible as used herein is intended to include water-soluble compounds, as well as compounds that may be dispersed in, borne by, or carried in an aqueous mixture (i.e. "water- borne") even though the compound is not actually soluble in water.
  • the water-dispersible, film-forming polymer is generally applied to the non-porous, holographic image embossed, or high gloss flexible carrier substrate material as part of a solution or dispersion including the cross-linkable polymer resistant to water moisture, although the two polymers need not be applied as part of a single solution or dispersion formulation.
  • Preferred for use in the practice of the present invention are water- dispersible polymers comprised of hydroxylated polymers, such as polyvinyl alcohols (PVAs) .
  • hydroxylated polymers can be used both as the cross-linkable polymer and the water-dispersible film- forming polymer.
  • poly (vinyl alcohol) with 0.5% to 15% by weight of a chemical crosslinking agent can be used to form a image receptive barrier coating composition.
  • the PVA crosslinked with the crosslinking agents of this invention provides improved barrier properties and increased resistance to solvents, greases, oils, waters, oxygen, tensile stresses etc. compared to uncrosslinked PVA.
  • water-dispersible, film-forming polymers include poly (butylene alcohol), poly (propylene alcohol), poly(vinyl acetate) , poly (hydroxyethy1 acrylate) , hydroxethylceRulose, carboxymethylcellulose, poly(vinyl pyrrolidone) , poly (styrene-co-butadiene) latex, and copolymers of any foregoing, and other like water-dispersible polymers. 17
  • Pigments may be added to the image receptive barrier coating composition to enhance the surface appearance of the coated sheet material.
  • the surface of the transfer coated sheet material be a white high gloss color.
  • titanium dioxide pigment, Ti-PureTM R-900 made by Dupont or calcium carbonate made by Specialty Minerals Inc. can be added to the image receptive barrier coating.
  • the amount of pigment will depend upon whiteness and brightness desired. To obtain optimum brightness, whiteness, and high gloss and minimize pigment usage, metallizing or vacuum depositing metal onto the pigmented image receptive barrier coating while on the flexible carrier substrate with an amount of metal to obtain optimum light reflectancy is preferred.
  • pigment addition is to print or coat the image receptive barrier coating with white or other pigment colors on the image receptive barrier coating composition either before or after the transfer process is completed to the porous substrate to achieve brightness, whiteness, opacity, or other colors deemed desirable.
  • printing or coating of the white pigment or other colors is done while the high gloss smooth image receptive barrier coating is still on the flexible carrier substrate prior to the transfer process.
  • opacity, whiteness, and brightness can be obtained by adding pigment (titanium dioxide and or calcium carbonate) to a bonding agent
  • a dispersing agent may be added to the image receptive barrier coating composition to help disperse and suspend the filler and pigment particles in the coating before deposition onto the flexible carrier substrate.
  • dispersing agents that may be used. For example, . TSPP or tetrasodium pyrophosphate has been found to be effective. Sodium hexametaphosphate is suitable as well for this use.
  • Dyes may be added, such as food dyes, to give desired colors or appearance to the image receptive barrier coated substrate material . These dyes may enhance the holographic or non holographic image receptive barrier coating and achieve special effects or the addition of new colors to the spectrum of holographic images .
  • the present invention represents a very unique approach to designing holographic, high gloss and high gloss coated porous sheet materials, and shaped articles there from, having various desirable properties and being simple and economical in design and construction.
  • Embodiments of the present invention achieve excellent holographic affects while maintaining recyclability, repulpability, and biodegradability.
  • the present invention has developed new ways of taking low grades of Kraft paper and converting them to high gloss, smooth, sealed grease water and oil resistant, printable surfaces while maintaining excellent recycling and biodegrading qualities.
  • embodiments of the present invention also achieve outstanding whiteness, brightness, high gloss, printability, recyclability, repulpability, and biodegradability on porous substrates. Further image enhancements can be obtained by metallizing which reduces the amount of expensive titanium dioxide pigment needed in white coatings. It has also been demonstrated that expensive titanium dioxide in the coatings of the present invention can be replaced with the less expensive calcium carbonate.
  • the following examples are offered illustratively: 19 EXAMPLE 1
  • An aqueous based image receptive barrier coating formulation comprised of:
  • This image receptive crosslinked barrier coating was then tested for water resistance while on the flexible polyester carrier substrate by depositing a drop of water onto the surface of the coating and the water was observed through a magnifying lens. After 10 seconds the water did not penetrate or swell the coating; after 30 second the water did not penetrate or swell, after 1 minute the water did not penetrate or swell the coating; thus demonstrating that this cured crosslinked PVA film exhibited good water resistance.
  • This image receptive PVA crosslinked barrier coating with flexible holographic image embossed carrier substrate was sent through a metallizing process whereby an opaque evaporated aluminum layer was deposited on top of the barrier coating. 20
  • the image receptive PVA coated 2 mil holographic image embossed polyester flexible carrier substrate with metal deposited onto the coating was then coated on top of the metal layer with a vinyl acetate ethylene copolymer based tie layer (adhesive) made by Air Products (#426) using a #6 Myar rod.
  • a sheet of Kraft paper (69# stock, International Paper) was placed on top of the wet adhesive layer, and the composite structure was then run through heated rollers (350°F) with high pressure.
  • the flexible holographic embossed carrier polyester film substrate should come in contact with the heated roller to release the holographic image receptive PVA crosslinked barrier coating from the flexible holographic embossed carrier substrate.
  • This heated lamination process contributes to setting the adhesive and forming a strong bond between the metal layer and paper.
  • the bond between the paper and the holographic image receptive barrier coating is greater than the bond between the coating and the flexible carrier substrate, the holographic image receptive barrier coating with the cast image of the holographic embossed surface will easily release from the carrier substrate and be transferred to the paper substrate.
  • polyvinyl alcohol can be used as image receptive barrier coating for producing high gloss coated substrates.
  • This also demonstrates the ability to use the lowest grades of porous paper and turn them into high gloss, multi-functional, non-porous, smooth, printable, recyclable, biodegradable, and repulpable items suitable for packaging.
  • a water based solution of Duponts 1 ElvanolTM HV super hydrolyzed polyvinyl alcohol (PVA) containing 7% solids was deposited onto a smooth untreated 2 mil polyester film to completely coat the surface.
  • a #24 rod was then pulled across the coating to leave a uniform 21 coating to the image receptive barrier coating solution on the polyester film substrate; the approximate coating rate was 7 lbs per 1000 sq ft.
  • the coating was uniform and even as evidenced by the lack of any "fish eyes" (voids) in the coating.
  • the coating was then fully cured at 300°F for 45 seconds in an oven.
  • the image receptive PVA coated 2 mil polyester film was then coated on top of the image receptive PVA with a vinyl acetate copolymer (adhesive) made by National Starch
  • This coalescent bonding occurs through -OH sites available from the image receptive PVA coating to the crosslinker added to the water based polyvinyl alcohol vinyl acetate ethylene copolymer based adhesive. This coalescent bonding increases the water resistance, wet rub, oil resistance, and adhesion to the paper substrate. Due to the clay coated surface being extremely absorbent and wet, it was found that waiting 3 - 5 minutes after wet lamination allowed the adhesive to set and the flexible carrier was easily removed from the composite structure. 22
  • This image receptive barrier coated high gloss white substrate was subjected to a water resistance test, a wet rub test, oil resistant test, a gloss test, tensile test, wet Mullen psi test, and Elmendorf tear test as described below.
  • a water drop was put onto the surface of the high gloss image receptive PVA barrier coated (transferred) white substrate and was observed through a magnifying lens. After 10 seconds, minor swelling of the PVA coating occurred; after 30 seconds, their was major swelling of the coating but no penetration past the image receptive barrier coating, thereby demonstrating good water resistance. It was observed that after the water droplet was removed from the surface, that the surface retained a shadow or dulling of the gloss appearance of where the droplet was due to the swelling of the image receptive barrier coating, but the same shadowing or dulling area disappears in time at ambient room temperatures or through heated air with complete return of the high gloss area.
  • a water drop was placed onto the surface of the high gloss image receptive PVA barrier coated (transferred) substrate and allowed to sit for 1 minute at room temperature.
  • a finger was placed on top of the water droplet and pressed down until contact with the PVA coating was made. The finger was then rubbed in circular motion with mild pressure in the area where the water drop was sitting on the coating. In 10 seconds, the image receptive PVA coating did not break down demonstrating that the image receptive barrier coating was mechanically and chemically bonded by the adhesive to the paper, exhibiting good water resistance.
  • Vegetable oil was poured onto the surface of the high gloss image receptive PVA barrier coated substrate and observed through a magnifying lens. After 3 minutes at room temperature the oil did not penetrate or swell the coating demonstrating that this coating exhibited very good oil resistance .
  • the high gloss image receptive barrier coating of the present invention provided gloss levels unobtainable by standard processes that paper mills, and or converters utilize in majority of today's packaging and promotional papers including varnish coatings.
  • the high gloss image receptive barrier coating provides exceptional improvements over standard white coated board in areas as indicated in Tensile NM Test and Elmendorf MD and CD Tests. 24
  • This example demonstrates the use of a simplified image receptive crosslinked barrier coating pigmented formulation, metallization and crosslinked barrier coating transfer process to produce high gloss white coated paper material with very good barrier properties.
  • An image receptive barrier coating solution was prepared containing:
  • the image receptive white crosslinked barrier coating with metal was then coated with (on top of the metal) a vinyl acetate ethylene copolymer based tie layer (adhesive) made by Air Products (#426) using #7 Myar Rod.
  • a sheet of Kraft paper (18 pt . Mead uncoated Kraft beverage board) was placed on top of the wet adhesive layer, and the composite structure was then run through heated rollers (325°F) with high pressure.
  • the flexible carrier polyester film side 25 should come in contact with the heated roller to assist (through co-expansion and contraction of two different polymer materials) with releasing the metallized image receptive white crosslinked barrier coating from the flexible carrier polyester film substrate to the paper substrate.
  • This heated lamination process contributes to setting the adhesive and forming a strong bond between the metal layer and the paper.
  • the bond between the paper and metal is greater than the bond between coating and flexible polyester film carrier, the metallized image receptive white crosslinked barrier coating will easily release from the carrier and be transferred to the paper substrate.
  • This process provides a high gloss, very white, printable, smooth, non-porous, cost effective, water resistant, grease oil and solvent resistant, biodegradable, recyclable, and repulpable coated paper substrate from a low cost unattractive grade of Kraft paper.
  • EXAMPLE 4 This example demonstrates that polyvinyl alcohol can be used as both the cross-linkable polymer resistant to penetration by water moisture when fully cured, and the water-dispersible film-forming polymer that is resistant to penetration by grease and oil when fully cured. It also demonstrates the ability to use PVA as the high gloss white image receptive barrier coating, printable and or coatable with pigments, capable of being metallized, and suitable for use in a transfer coat process.
  • a water solution of AirvolTM 165 super hydrolyzed polyvinyl alcohol containing 7% solids was deposited onto a high gloss flexible polyester film carrier with complete surface coverage.
  • a #24 Myar Rod was then pulled across the coating to leave a uniform coating of the image receptive barrier coating on the untreated flexible polyester film carrier, the approximate coating rate was 7 lbs per 1000 square feet.
  • the wet image receptive barrier coating was uniform and no "fish-eyes" were observed.
  • the coated polyester composite was then fully cured in an oven at 350°F 26 for 1 minute to effect drying and air crosslinking. This cured coating was subjected to a water resistance test and an oil test.
  • a water drop was put onto the surface of the cured barrier coating while still on the flexible polyester film carrier substrate and was observed through a magnifying tens. After 5 seconds, the coating had swelled but the drop had not penetrated past the coating; after 15 seconds, the coating had increased in swelling but the droplet had not broken the coating continuity exhibiting enough water resistance to allow the image receptive barrier coating to be printed or coated with an aqueous based pigmented system to achieve a desired printed pattern or color.
  • Vegetable oil was poured onto the surface of the cured barrier coating while still on the flexible polyester film carrier substrate and observed through a magnifying lens. After 1 minute at room temperature, the oil did not penetrate or swell the coating demonstrating that this coating exhibited very good oil resistance.
  • the pigmented coating composition of the following formulation was prepared by blending the following ingredients :
  • This coating was deposited onto the image receptive clear barrier coating surface described above with a #5 Myar Rod 27 while the coating was still on the flexible polyester film carrier.
  • the pigmented crosslinked coating was applied at the rate of 3 lbs per 1000 square feet and was then fully cured by putting the multilayer composite material into an oven for 30 seconds at 250°F This heating process contributed to 2 main functions.
  • the heat is used to accelerate the evaporation process of the aqueous based system carrying the pigments, and secondly the heating process causes the acceleration of the crosslinking process of the crosslinker added to the pigmented coating, to the cross-linkable sites available in the pigmented coating and the sites available on the image receptive PVA barrier coating.
  • the white pigmented coating exhibited good adhesion to the image receptive barrier coating.
  • This white coated substrate was then metallized (evaporated aluminum) to thickness providing a 4% light transmission on top of the white pigmented coating.
  • the metal layer exhibited good adhesion to the coated substrate.
  • the image receptive PVA barrier coating with a pigment cured coating and aluminum metal and polyester carrier was then coated with (on top of the metal) a vinyl acetate ethylene copolymer tie layer (adhesive) made by Air Products (#426) using a #7 Myar Rod.
  • a sheet of Kraft Paper (18pt 69# Mead Paper) was placed on top of the wet adhesive layer, and the composite structure was then run through heated rollers (350°F) with high pressure.
  • the flexible carrier should come in contact with the heated roller to assist with releasing the high gloss image receptive metallized barrier coating from the flexible polyester film carrier to the paper substrate. This heated lamination process contributes to the setting the adhesive and forming a strong bond between the metal layer and the paper.
  • the high gloss image receptive metallized 28 barrier coating will easily release from the polyester carrier and be transferred to the paper substrate.
  • This process produces a high gloss, very white, printable, smooth, non-porous substrate that is cost effective, water, oil, grease and solvent resistant and environmentally friendly, from a low grade Kraft porous substrate.
  • the following table provides results of Tappi whiteness/brightness, opacity, and gloss level tests of the embodiments of this invention compared to typical papers currently available:

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Laminated Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne une composition de revêtement économique pour des substrats poreux produisant des surfaces brillantes, pouvant recevoir des images holographiques, offrant de bonnes propriétés de barrière à l'oxygène ainsi qu'une bonne résistance à l'huile, à la graisse, aux solvants et à l'eau. Ces revêtements sur des substrats de papier sont imprimables, biodégradables, recyclables et retriturables. Ils sont également appropriés pour être utilisés avec des produits alimentaires. L'invention concerne également un procédé permettant d'appliquer lesdits revêtements sur des substrats poreux, ainsi qu'un procédé permettant de produire de manière économique, des images holographiques bon marché sur des substrats tels que des récipients en papier ou en carton.
EP98915372A 1998-04-08 1998-04-08 Revetement a base aqueuse recepteur d'image et son procede de preparation Withdrawn EP1070173A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1998/006994 WO1999053138A1 (fr) 1998-04-08 1998-04-08 Revetement a base aqueuse recepteur d'image et son procede de preparation

Publications (1)

Publication Number Publication Date
EP1070173A1 true EP1070173A1 (fr) 2001-01-24

Family

ID=22266793

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98915372A Withdrawn EP1070173A1 (fr) 1998-04-08 1998-04-08 Revetement a base aqueuse recepteur d'image et son procede de preparation

Country Status (4)

Country Link
EP (1) EP1070173A1 (fr)
AU (1) AU746397B2 (fr)
CA (1) CA2327478A1 (fr)
WO (1) WO1999053138A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100392200C (zh) * 2006-08-22 2008-06-04 南京林业大学 一种炭化木复合地板及其制造方法
CN100392201C (zh) * 2006-08-22 2008-06-04 浙江林学院 一种适合于地热的实木复合地板及其制造方法
EP3435156A1 (fr) * 2017-07-26 2019-01-30 Covestro Deutschland AG Couche protectrice pour photopolymères
GB2618057A (en) * 2022-02-25 2023-11-01 Gardiner Graphics Group Ltd Repulpable, self-adhesive printable paper
CN115285501A (zh) * 2022-07-06 2022-11-04 邹芳 一种具有防水内衬的拉链纸箱

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3300364A (en) * 1964-05-05 1967-01-24 Albemarle Paper Co Process for smoothly laminating a thin film on an unsmoothed paper base
US3580876A (en) * 1968-04-19 1971-05-25 Standard Brands Chem Ind Inc Film-forming composition of interpolymer latex and coalescing agent
JPS60250067A (ja) * 1984-05-25 1985-12-10 Nippon Paint Co Ltd 上塗用クリヤ−塗料組成物
US5320898A (en) * 1993-03-11 1994-06-14 Sanyo-Kokusaku Pulp Co., Ltd. Paper suitable for ink fusion transfer type thermal printer and copiers, and a manufacturing method thereof
US5464690A (en) * 1994-04-04 1995-11-07 Novavision, Inc. Holographic document and method for forming

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9953138A1 *

Also Published As

Publication number Publication date
WO1999053138A1 (fr) 1999-10-21
CA2327478A1 (fr) 1999-10-21
AU6957698A (en) 1999-11-01
AU746397B2 (en) 2002-05-02

Similar Documents

Publication Publication Date Title
US6132822A (en) High gloss barrier coatings and coated sheets
US6358442B1 (en) Animated light diffracting, prismatic refracting, and/or holographic surface papers, board and other substrates and low-cost pattern transfer method of manufacturing the same
US5756183A (en) Microembossed paper, microembossable coating for paper substrates and a process for microembossing paper substrates
EP1080396A1 (fr) Element d'emballage thermoretrecissable a image holographique et son procede de fabrication
US20120205426A1 (en) Process For The Application Of Brilliant Metallic Inks To Paper Or Paperboard
AU746397B2 (en) Aqueous based image receptive coating and process for producing same
KR100504274B1 (ko) 마이크로엠보싱 이미지를 포함하는 투명 물품의 제조 방법
NZ219922A (en) Transparent plastic printing film with rubbery resin and/or styrene resin coating
JP4508774B2 (ja) アルミニウム蒸着ラベルおよびその製造方法
JP2004530815A (ja) ホログラフィーパターンを含んだ印刷可能なシートおよびその製作方法
US20070116943A1 (en) Method for making holograms
JP3075454B2 (ja) 偽造防止用紙
JP2893310B2 (ja) 偽造防止用紙
AU2020286082A1 (en) Method for varnishing substrates, and varnished substrates
JPH07216792A (ja) 強光沢印刷物
JPH08284099A (ja) 剥離紙用グラシン紙
JP2000172158A (ja) ホログラム転写物及びその製造方法
JPH07279096A (ja) 強光沢印刷物
AU2002302826A1 (en) A method for making holograms

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20001027

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

17Q First examination report despatched

Effective date: 20010228

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

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

18D Application deemed to be withdrawn

Effective date: 20021225