Coated Paper and Oxygen Barrier Dispersions

Abstract

The present invention relates to a method for coating paper with a composition comprising a colloidal suspension of thermoplastic particles in an aqueous polyvinyl alcohol (PVA) solution, an article comprising the coated paper, and a process for making the coated paper. The coated paper is useful as a single-ply oxygen barrier coated paper or paperboard. The present invention also relates to a composition comprising a colloidal suspension of thermoplastic particles in an aqueous polyvinyl alcohol (PVA) solution.

Description

[Technical Field]

[0001] The present invention relates to paper coated with a composition comprising a melt-blended colloidal suspension of thermoplastic particles in an aqueous polyvinyl alcohol (PVA) solution, articles comprising the coated paper, and processes for making the coated paper. The present invention also relates to a composition comprising a colloidal suspension of thermoplastic particles in an aqueous polyvinyl alcohol (PVA) solution.

[0002] Coatings for paper or paperboard for use in various applications are known to provide a barrier against a wide range of substances, including oxygen, water, oil, and acid. Polyvinyl alcohol (PVA) is a water-soluble polymer often used in coating applications to provide beneficial properties such as adhesion and oxygen barrier properties. However, PVA has a high melting temperature (above 180°C, depending on the hydrolysis level), and long mixing times (over 2 hours) at high temperatures (90°C) are required to dissolve PVA uniformly in water. Furthermore, aqueous solutions of PVA, especially high molecular weight grades of polymer, are highly viscous at low solids percentages (approximately 10-15 wt%). Such aqueous PVA solutions are difficult to pump because they do not exhibit the normal shear-thinning behavior of polymer solutions.

[0003] Typically, high performance coatings, such as those used on paper drinking cups, are prepared by extrusion coating or laminating a film directly onto the paper substrate, often using multiple film layers. This lamination approach can impart preferential properties to the paper substrate, but it can also increase processing time, increase coating weight, and negatively impact the recyclability of the paper substrate.

[0004] International Publication No. 2021 / 091091(A1) (also published as Korean Patent Publication No. 2021 / 056129(A1)) discloses a barrier resin having a multilayer structure and a method for producing the same. Using ethylene vinyl alcohol as a representative barrier resin, the barrier resin is provided as an extruded film with a multilayer structure of polyethylene / adhesive resin / ethylene vinyl alcohol layer / adhesive resin / polyethylene. The multilayer barrier resin is provided as a melt-blended resin by adjusting the volume ratio and viscosity ratio of the polyolefin, barrier resin, and compatibilizer. The barrier resin, which is included together with the polyolefin and compatibilizer to improve oxygen barrier properties, is characterized by containing at least one selected from the group consisting of polyamide, polyvinyl alcohol, and ethylene-vinyl alcohol copolymer. In this case, the ethylene-vinyl alcohol copolymer contains 10 to 50 mol% ethylene. When the polyolefin resin continuous phase (matrix) contains a barrier resin continuous phase (matrix) or a dispersed phase (domain), the volume ratio of the polyolefin resin continuous phase to the barrier resin is provided in the range of 30:70 to 70:30, preferably 50:50.

[0005] Japanese Patent No. 3810089(B2) (based on WO 1997 / 022536(A1)) discloses a method for producing a laminated packaging material comprising a core layer and a polyvinyl alcohol layer attached to one side of the core layer and functioning as an oxygen gas barrier layer. The polyvinyl alcohol can be combined in a simple manner with one or more polymers known per se, such as hydrophobic polymers. The mixing ratio of the polyvinyl alcohol and the hydrophobic polymer is important, with the amount of the hydrophobic polymer ranging from 5% to 50% of the total weight of the mixture, calculated based on the total dry weight of the mixture (correspondingly, the amount of polyvinyl alcohol is 95% to 50%).

[0006] The present invention provides a process for preparing a single layer oxygen barrier coated paper or paperboard, comprising: a) applying a coating composition onto paper or paperboard comprising a melt-blended colloidal suspension of thermoplastic particles in an aqueous polyvinyl alcohol (PVA) solution; b) Drying the composition to give a density of 1 to 20 g / m 2 and producing a film having a coating weight in the range of the coating composition having a polymer solids concentration of at least 25 weight percent, a viscosity of 5000 centipoise (cP) or less, and a volume mean (Vmean) particle size in the range of 100 nanometers (nm) to 10 microns; The coating composition contains 10 to less than 40% by weight of polyvinyl alcohol based on the total weight of all polymer solids, is 88% to 98% saponified, and has a viscosity (mPa*sec of a 4% aqueous solution at 20°C) of less than 30 cP; The process provides that the thermoplastic particles of the coating composition comprise a non-polar thermoplastic polymer having a melt flow index in the range of 5 to 1300, and is greater than 60 to 90 weight percent based on the total weight of all polymer solids. The invention further provides an article made according to the process for preparing a single layer oxygen barrier coated paper or paperboard, wherein after drying, the coated paper or paperboard has a KIT value of greater than 10 and a viscosity of 20 cc / m 2 The present invention provides an article having an oxygen transport rate of less than 100 days.

[0007] Coating compositions that are melt-blended colloidal suspensions of thermoplastic particles in aqueous polyvinyl alcohol (PVA) solutions can be prepared by continuous or batch processes. The process for making the coating composition involves combining PVA with water above the melting temperature of the PVA to form a concentrated PVA solution, and combining this concentrated PVA solution with a thermoplastic polymer melt to produce a thermoplastic melt emulsion. The concentrated PVA solution and thermoplastic polymer are mixed at a temperature 15°C above the glass transition temperature (Tg) or melting temperature (Tm) of the thermoplastic base resin. An example of a preferred continuous process is twin-screw extrusion, as described in U.S. Pat. No. 8,722,787, Comparative Example E. In a continuous process, the PVA and thermoplastic polymer are advantageously melt-blended together in a continuous process and then combined with a certain amount of water to simultaneously form a concentrated PVA solution and a melt emulsion in a continuous melt-mixing device, such as a twin-screw extruder. Alternatively, a batch process can be used whereby combining the PVA with a small amount of water and melt mixing this concentrated PVA solution with the thermoplastic polymer can be accomplished sequentially in a high temperature melt mixing batch process, such as a pressurized helical batch mixer, for example, using a pressurized helical batch mixer such as a 2CV Helicone mixer, which is a conical batch mixer that uses double intermeshing conical blades to mix high viscosity materials.

[0008] In preparing the coating composition, the concentrated PVA solution can be made either in a separate step (batch pressure mixer process) or, more advantageously, simultaneously with the thermoplastic melt emulsion (continuous extruder process). In both cases, the concentrated PVA solution is made by contacting PVA with water at a temperature above its melting temperature (above 180°C), with a pressure sufficient to exceed the water vapor pressure at the contact temperature so that the water remains liquid. Additional water is then added to the concentrated thermoplastic melt emulsion to reduce the viscosity to a level suitable for use as a coating.

[0009] Although a form of colloidal suspension of thermoplastic particles in an aqueous PVA solution can be produced by simply mixing a thermoplastic polymer dispersion with a PVA solution, the solids content of the compositions of the present invention can be maximized by dispersing the thermoplastic polymer directly into a very concentrated PVA solution in a melt mixing device, and subsequently diluting the concentrated thermoplastic melt emulsion to a solids percentage and viscosity level appropriate for use as a coating.

[0010] The concentration of polymer solids in the coating composition is at least 20 weight percent, preferably at least 25 weight percent, more preferably at least 30 weight percent, and most preferably at least 40 weight percent, based on the combined weight of water and polymer. The solids content of the coating composition is measured using an infrared solids analyzer, such as an OHAUS® MB45 water analyzer, or similar equipment. The coating composition preferably has a viscosity of 5000 centipoise (cP) or less, more preferably 2500 cP or less, and most preferably 1000 cP or less. The viscosity of the coating composition is measured using an RV viscometer at 50 rpm using the appropriate spindle for the given viscosity, e.g., an RV3, at 50 rpm. Centipoise is the SI unit of 1 millipascal-second (mPa*s). The coating composition preferably has a volume mean (Vmean) particle size in the range of 100 nanometers (nm) to 10 microns, more preferably in the range of 100 nm to 5 microns, and most preferably in the range of 100 nm to 2 microns. All individual values ​​and subranges from 100 nm to 10 microns are included herein and disclosed herein. The particle size of the solid particles of the coating composition is measured using a COULTER™ LS-230 Particle Size Analyzer (Beckman Coulter Corporation, Fullerton, CA).

[0011] The polyvinyl alcohol used is 88% to 98% saponified and has a viscosity (mPa*sec of a 4% aqueous solution at 20°C) of less than 30, preferably less than 10. The amount of polyvinyl alcohol in the coating composition is 10 to less than 40 wt%, preferably 15 to 35 wt%, and most preferably 18 to 30 wt%, based on the total weight of all polymer solids. All individual values ​​and subranges from 10 to less than 40 wt% are included herein and disclosed herein. Without being bound by any theory, it is theorized that higher levels of PVA provide a rougher surface topography of the coated sample, which may result in more surface defects that can reduce OTR performance. Atomic force microscopy can be useful for assessing surface roughness and comparing it to OTR values, as shown in the examples. Examples of commercially available PVA include Poval™ 4-88 available from Kuraray, Poval™ 6-88 available from Kuraray, Poval™ 18-88 available from Kuraray, Poval™ 10-98 available from Kuraray, Selvol™ E310 available from Sekisui Specialty Chemicals America, and end-hydrophobically modified materials such as Exceval® RS-2117 available from Kuraray, as well as blends thereof. Blends of different PVA grades, particularly blends of 88% and 98% hydrolyzed polymers, can be used. Although not preferred, copolymers of vinyl alcohol, such as ethylene vinyl alcohol (EVA), can be included in the PVA. While EVA polymers may be included with the PVA, it is preferred that no EVA is included, which can also be referred to as no added EVA. When EVA is included with the PVA, the ethylene content of the EVA is preferably less than 10 mole percent, more preferably less than 5 mole percent, and most preferably less than 1 mole percent. An example of a commercially available EVA with a 44 mole percent ethylene content is Soarnol™ A4412, a material that is not well miscible with thermoplastic polymers.

[0012] The thermoplastic particles comprise a non-polar thermoplastic polymer, where non-polar is defined as absorbing less than 5% by weight (<5%) of water, based on the weight of the thermoplastic polymer. The thermoplastic polymer must have a glass transition (Tg) temperature of less than 30°C to ensure a flexible, defect-free barrier coating. The Tg value of a polymer can be calculated herein by using the Fox equation (T.G. Fox, Bull. Am. Physics Soc., Volume 1, Issue No. 3, page 123 (1956)), i.e., when calculating the Tg of a copolymer of monomers M1 and M2, 1 / Tg(calculated value)=w(M1) / Tg(M1)+w(M2) / Tg(M2), where Tg(calculated) is the calculated glass transition temperature for the copolymer; w(M1) is the weight fraction of monomer M1 in the copolymer; w(M2) is the weight fraction of monomer M2 in the copolymer; Tg(M1) is the glass transition temperature of the homopolymer of M1; Tg(M2) is the glass transition temperature of the homopolymer of M2; All temperatures are in K. The glass transition temperatures of homopolymers can be found, for example, in the "Polymer Handbook" edited by J. Brandrup and EH Immergut (Interscience Publishers). In embodiments where two or more different emulsion polymers or emulsion polymers containing multiple phases, such as core / shell polymers, are used, the calculated Tg of the emulsion polymer is then calculated based on the overall composition of the polymer components. However, if the thermoplastic polymer does not have a sufficiently low Tg, a plasticizer can be added to lower the Tg.

[0013] Thermoplastic polymers include olefin polymers and copolymers such as high-density polyethylene (HDPE), ethylene octene copolymers, and ethylene vinyl acetate copolymers; biopolymers such as polyhydroxybutanoate, polylactic acid, and polycaprolactone; polyesters such as polylactic acid and polyhydroxyalkanoates; thermoplastic acrylics such as isobutyl methacrylate; and combinations thereof. For example, miscible blends of polymers, such as HDPE and polyethylene wax, can also be used as thermoplastic polymers. Preferably, the thermoplastic polymers are limited to olefin polymers and copolymers and miscible blends thereof, and most preferably, the thermoplastic polymers are limited to olefin polymers and copolymers and blends thereof. The thermoplastic polymers have a melt flow index (MFI) (190°C / 2.16 kg) greater than 5, preferably greater than 25, and most preferably greater than 100, measured according to ASTM D1238 standard, with a maximum MFI of 1300. All individual values ​​and subranges from 5 to 1300 MFI are included herein and disclosed herein. The amount of thermoplastic polymer in the coating composition, based on the total weight of all polymer solids, is from greater than 60 to 90 weight percent, preferably from 65 to 85 weight percent, and most preferably from 70 to 82 weight percent. All individual values ​​and subranges from greater than 60 to 90 weight percent are included herein and disclosed herein.

[0014] The coating composition may optionally include one or more compatibilizers, such as polymeric coupling agents, to improve compatibility between the PVA and the thermoplastic particles or any other added components. Preferably, however, the coating composition is made without the use of a compatibilizer, which is also referred to as being in the absence of a compatibilizer or not including any compatibilizer. Examples of suitable coupling agents include ethylene-co-maleic anhydride, which, when used, is present in a concentration ranging from 5 to 20 weight percent, more preferably up to 10 weight percent, based on the weight of polymer solids in the coating composition.

[0015] The coating composition may optionally contain up to 5 weight percent, based on the weight of polymer solids in the composition, of a wax such as ethylene bis(stearamide) and a polyolefin wax such as commercially available POLYWAX™ 655 polyethylene available from Baker Hughes, Inc. or its affiliates or ACRAWAX™ C (N,N′ ethylene bisstearamide) available from Lonza or its affiliates.

[0016] The coating composition may optionally be mixed or formulated with one or more additional ingredients as would be understood by one skilled in the art, such as other aqueous dispersions, pigments, wetting agents, defoamers, solvents, rheology modifiers, surfactants, antioxidants, and other processing aids to improve the barrier and performance attributes of the coated paperboard, including, for example, compatibility with the substrate, wetting of the dispersion, flexibility of the coating, coating integrity when exposed to extreme temperatures or radiation, flow, heat seal, blocking resistance, and other attributes, and cost reduction at the point of use.

[0017] The coating compositions of the present invention are continuous in PVA and have low coating weights, allowing for repulping of paper substrates while maintaining a high level of oxygen barrier. The coating compositions can be applied to paper or paperboard using conventional wet application methods known to those skilled in the art, such as a wire-wound drawdown bar. The wet film is then dried or heated to remove water, preferably at temperatures ranging from 50°C, more preferably from 70°C, to preferably 150°C, more preferably 120°C, and at a coating density of 1 g / m 2 to, preferably 2 g / m 2 to, more preferably 4 g / m 2 to, most preferably 6 g / m 2 From 20g / m 2 up to, preferably 15 g / m 2 up to, more preferably 10 g / m 2 up to 7 g / m 2It is possible to provide a coat weight of 1-20g / cm 2 All individual values ​​and subranges are included herein and disclosed herein. The paper or paperboard may be uncoated or pre-coated. A very thin layer of film having high oxygen barrier properties, good oil resistance (KIT value greater than 10), good heat seal performance, and good blocking resistance can be coated onto the paper or paperboard, and further, application can be done in a single pass. The oxygen transport rate (OTR) of the coated paper substrate of the present invention is 50 cc / m or less. 2 -less than 20cc / m per day, preferably 20cc / m 2 - less than 1 day, more preferably 10 cc / m 2 -Less than days.

[0018] Sample preparation 62g / m 2 Coated paper samples were prepared by applying the coating composition to the uncoated glossy side of a paper substrate manufactured by UPM Specialty Papers having a coating weight of approximately 10 g / m 2 Coated paper and paperboard samples were prepared manually using a wire-wound drawdown bar to achieve a dry coating weight of 100°C. Samples were cured in a Fisher Scientific Isotemp 180L Oven FA oven at 100°C for 2 minutes.

[0019] Coat weight measurement The coat weight of the samples was 7.17 inches for coated and uncoated paper. 2 (46.26cm 2 The coating weight was measured by cutting a 100°C (2.5 oz) section and then placing the section in a 100°C oven for 2 minutes. All samples were then weighed and the coat weight was determined by the difference between the coated and uncoated samples. The coat weight was reported in grams per square meter (gsm or g / m 2 )

[0020] Kit Test The coated papers were tested for oil and grease resistance according to TAPPI method T559cm-12. A prepared kit solution consisting of a mixture of castor oil, toluene, and heptane was applied dropwise to the coated specimen. After 15 seconds, solvent leakage into the coating was observed, and the solution was wiped off the substrate. Any discoloration or change in appearance to the substrate was considered a failure for that particular kit solution. A score rating of 1 to 12 was assigned to the highest numbered kit solution that passed the test, with 12 representing the best performance.

[0021] OTR Test Procedures The oxygen transmission rate (OTR) of the film is measured at 23°C, 50% relative humidity, and 1 atmosphere pressure according to ASTM D-3985 using an OX-TRAN® Model 2 / 21ML module manufactured by Mocon Inc. 2 of coated paper specimens are cut, then masked and loaded directly into a MOCON OXTRAN® 2 / 21ML unit for measurement. The masking material is 3 mil aluminum with an acrylic adhesive layer to create a seal. The effective test area is 20.27 cm 2 A test gas containing 100% oxygen is used so that the permeation does not exceed the detection range of the MOCON OXTRAN® 2 / 21ML module. OTR values ​​are expressed in cc / m 2 -day or g / m 2 - Expressed in days. OTR results have two values, which are repeat test results for the same sample.

[0022] Blocking Resistance Test Procedure Blocking resistance was tested on coated paper samples using a metal spring-loaded compression tool (IC Block Tester, K53000, Koehler Instrument Company, Inc.) at elevated temperatures. Samples were cut into 2-inch by 3-inch rectangles and placed coated / coated (reported as C / C) or coated / uncoated (reported as C / U) faces in contact with each other between the metal plates of the compression tool. The spring was compressed at 50 psi, and the entire tool was placed in a 60°C oven for 1 hour. After removal from the oven, the samples were allowed to cool at room temperature for 30 minutes before testing. The samples were then pulled apart and scored according to the scale described herein. Measurements were performed twice for each sample. A rating score of 1 was the best and 5 was the worst.

[0023] Blocking resistance evaluation 1- The sheets separate and fall apart without resistance 2-Minimal force required to separate the sheets 3- The force required to separate the sheets is constant 4- Minimal fiber tearing when separating sheets 5 - There is significant fiber tearing when separating the sheets, and the sheets are not completely bonded to each other.

[0024] Heat Seal Test Procedure Heat seal testing was performed on coated paper samples using an HST-H3 instrument. The samples were cut into 1 x 2 inch specimens and loaded coated / coated (reported as C / C) or coated / uncoated (reported as (C / U)) sides in contact with each other between clamps. A pressure of 70-80 psi was applied at 190°C for 0.5 seconds. After removal, the samples were allowed to cool at room temperature for approximately 1 minute (the samples were cool to the touch). The samples were then pulled apart and rated as P, M, or F in the following sense: P: Pass, paper comes off when pulled M: Insufficient, paper peels off like a sticky note F: Fail, paper falls apart

[0025] Atomic force microscopy (AFM) AFM is an analytical technique that allows imaging of surfaces, including polymers, ceramics, composites, glass, and biological samples. AFM operates in two basic modes: contact mode and tapping mode. In contact mode, the AFM tip is in continuous contact with the surface. In tapping mode, the AFM cantilever oscillates over the sample surface, with the tip only making intermittent contact with the surface. Chemical interactions between the sample's surface atoms and the tip change the tip's vibration frequency, allowing the surface atoms to be detected and mapped. AFM provides 3D surface profiles and can provide surface measurements.

[0026] For the examples, images were obtained using a Bruker Dimension FastScan™ atomic force microscope in tapping mode. Typical surface imaging parameters were used as shown below to measure surface attributes, including average roughness (Sa), Z-range - the height difference between the highest and lowest pixel in the image (Sz), maximum valley depth (Sv), and maximum peak height (Sp). Post-processing of images was performed using SPIP or MountainSPIP image processing software tools. Both height and phase images (viscoelastic difference) were generated and the data provided in the examples. The instrument parameters were as follows:

[0027] Tip characteristics: (a) mode—tapping, (b) tip type—TESPA-V2, (c) spring constant—48 N / m, (d) resonance frequency—190 kHz, (e) coating—AL30 nm.

[0028] Scanning parameters: (1) scan rate - 1 Hz, (2) lines / frame - 512, (3) free amplitude - 500 mV, (4) Amp / PF set point - 456 mV, (5) drive frequency - 332 kHz, (6) drive amplitude - 96 mV, (7) gain I,P - 1,5.

[0029] In the examples and comparative examples, the compositions shown in Tables 1 and 2 are used.

[0030] [Table 1]

[0031] [Table 2] [Example]

[0032] Inventive Coating Compositions 1-11 and Comparative Coating Compositions 1-2, having the polymer phase components and physical properties shown in Table 3, were formed from the raw materials shown in Tables 1 and 2 and were prepared according to the general procedures, processes, and conditions described herein. The thermoplastic polymer resin and PVA listed for each example in Table 3 were fed into a 25 mm diameter twin-screw extruder at a total feed rate of 75.6 g / min using controlled-speed feeders in the given ratios listed in Table 3. Components 1 and 2 were fed through the extruder and melted to form a liquid molten material, with the melt zone temperature within the extruder set higher than the melt temperature of the PVA material. An initial amount of water was then added to the extruder at a rate approximately equal to the feed rate of the PVA material. Additional dilution water was then added in a later section of the extruder at a rate that provided the composition solids percentages shown in Table 3. The extruder speed used was 600 rpm. At the extruder exit, a backpressure regulator was used to adjust the pressure in the extruder barrel to a pressure appropriate for reducing water vapor formation (typically, the pressure was 2 MPa to 4 MPa). Each coating composition exited the extruder and was first filtered through a 200 micrometer (μm) filter. The resulting filtered coating composition was measured for solids content in weight percent (wt%), and the volume average particle size of the solid particles in the coating composition was measured in microns. The solids content of the coating composition was measured using an infrared solids analyzer, the viscosity of the coating composition was measured using an RV viscometer at 50 rpm using the appropriate spindle for the given viscosity (RV3), and the particle size of the solid particles in the coating composition was measured using a COULTER™ LS-230 particle size analyzer (Beckman Coulter Corporation, Fullerton, CA). The solids content, viscosity, and average particle size (PS) of the solid particles of the coating compositions are shown in Table 3.

[0033] [Table 3]

[0034] Table 4 shows the performance results of coated paper samples prepared by applying the coating compositions of Table 3 to paper substrates according to the procedures described in the sample preparation description.

[0035] [Table 4]

[0036] Notes for Table 4: CP means coated paper; Inv means invention; Comp means comparison; C / C means results between two coated paper samples; C / U means results between a coated and an uncoated paper sample.

[0037] Table 5 shows AFM measurements on some of the coated paper samples from Table 4.

[0038] [Table 5]

[0039] In Table 4, CP Comparative 1 shows a large variation in OTR values ​​resulting from compositions with 40 wt% PVA, especially when compared to CP Inventive 8, which has 30 wt% PVA.

Claims

1. 1. A process for preparing a single layer oxygen barrier coated paper or paperboard, comprising: a) applying a coating composition onto paper or paperboard comprising a melt-blended colloidal suspension of thermoplastic particles in an aqueous polyvinyl alcohol (PVA) solution; b) drying the composition to obtain a coating of 1 to 20 g / m ２ and producing a film having a coating weight in the range of the coating composition having a polymer solids concentration of at least 25 weight percent, a viscosity of 5000 centipoise (cP) or less, and a volume mean (Vmean) particle size ranging from 100 nanometers (nm) to 10 microns; the polyvinyl alcohol of the coating composition is 10 to less than 40 wt. % based on the total weight of all polymer solids, is 88% to 98% saponified, and has a viscosity (mPa*sec of a 4% aqueous solution at 20°C) of less than 30 cP; The process wherein the thermoplastic particles of the coating composition comprise a non-polar thermoplastic polymer having a melt flow index ranging from 5 to 1300, and is greater than 60 to 90 weight percent based on the total weight of all polymer solids.

2. 10. The process of claim 1, wherein the PVA of the coating composition is 15 to 35 wt %, based on the total weight of all polymer solids, and the thermoplastic polymer of the coating composition is 65 to 85 wt %, based on the total weight of all polymer solids.

3. 10. The process of claim 1, wherein the thermoplastic polymer is from the group consisting of olefin polymers, olefin copolymers, and miscible blends thereof.

4. 10. The process of claim 1, wherein the thermoplastic polymer is from the group consisting of high density polyethylene (HDPE), ethylene octene copolymer, ethylene vinyl acetate copolymer, and blends thereof.

5. 10. The process of claim 1, wherein the polyvinyl alcohol of the coating composition does not contain added ethylene vinyl alcohol.

6. The process of claim 1 , wherein the coating composition is made without the use of a compatibilizer.

7. The cured film has a thickness of 6 to 15 g / cm ２ 10. The process of claim 1, wherein the coating weight is in the range of

8. The process of any one of claims 1 to 7, wherein the coating composition further comprises up to 5 weight percent of a wax, based on the weight of polymer solids in the coating composition.

9. 9. An article made according to the process of any one of claims 1 to 8, wherein after drying, the coated paper or paperboard has a KIT value of greater than 10 and a viscosity of 20 cc / m ２ - an article having an oxygen transport rate of less than 1000 kcal / day.

10. 9. An article made according to the process of any one of claims 1 to 8, wherein after drying, the coated paper or paperboard has a KIT value of greater than 10 and a viscosity of 10 cc / m ２ - an article having an oxygen transport rate of less than 1000 kcal / day.

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