Water-resistant and repulpable composition

Abstract

Disclosed herein is a printable paper comprising a cellulosic substrate having a first surface and a second surface opposite the first surface, the printable paper having a thickness of 20 g / m 2 The printable paper has a 2 minute Cobb sizing value of less than 100 mm and the first surface, the second surface, or both have a surface energy of more than 37 dynes / cm. Further disclosed herein are protective transport bags, such as those obtained from the printable paper, and reusable flexible packaging containers, such as those including the printable paper. Also disclosed herein are methods of making the reusable flexible packaging containers.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of U.S. Patent Application No. 63 / 159,287, filed March 10, 2021, the disclosure of which is expressly incorporated by reference in its entirety herein.

[0002] FIELD OF THE DISCLOSURE This disclosure relates to packaging compositions, and more particularly to waterproof and repulpable shipping packages and papers, and methods of making and using the same. [Background technology]

[0003] Packaging materials for product retail and shipping are typically durable enough to allow the use of reliable materials. Typical considerations in the development of such materials include their barrier performance, tensile and tear strength, resistance to wrinkles and abrasions, manufacturing efficiency, and resistance to handling, infestation by rodents and vermin, and the ability of materials and packages made therefrom to deter theft. Packages and packaging materials are also desirably relatively inexpensive to manufacture, and preferably have an appealing appearance, print quality, feel, and tactile sensation to customers, so as to promote not only the use of the product, but also to enhance the image or association of the product.

[0004] Although plastic and Tyvek substrates offer advantages over fiber-based materials in terms of durability and water repellency, these materials are over-engineered for many e-commerce transportation applications. More importantly, they are becoming less and less popular with many brands due to environmental considerations. Several groups support the use of paper and board, or other products made from wood pulp. In the manufacture of paper and board, or other products made from wood pulp, petroleum-derived paraffin wax and synthetic polymers have been used for many years as moisture barriers, water repellents, oil repellents, reinforcing agents, strengthening agents, and release agents. Besides paraffin, the most frequently used material is polyethylene, but other widely used polymers include polymerized acrylics, vinyls, styrenes, ethylenes, and copolymers or heteropolymers of these monomers. Petroleum-derived polymers, and especially petroleum waxes, are not biodegradable in papermaking white water (recycled process water) and wastewater, making paper and board to which these traditional materials are applied difficult and often impossible to repulp and reuse in standard papermaking processes. In addition, petroleum wax residues that are not removed from the pulp fibers during the repulping and recycling process cause serious problems due to the build-up that occurs on screens and felts used during the paper or paperboard sheet forming and manufacturing process. In addition, paper and paperboard coated or impregnated with petroleum wax resists biodegradation and composting when disposed of in landfills and other waste disposal systems. Paper and paperboard coated or impregnated with conventional synthetic polymers and heteropolymers are also difficult and often impossible to repulp and reuse due to their resistance to separation from the fibers in standard repulping processes, resulting in significant fiber losses in attempts to repulp and reuse them, and they are also not biodegradable and therefore resist composting.

[0005] Additionally, conventional paper and paperboard used in commercial shipping applications are typically bulky, increasing the cost of the packaging.

[0006] Thus, a need exists to provide reusable, durable shipping packaging for use, for example, with apparel and non-fragile goods, as an alternative to plastic and non-reusable shipping packaging. The compositions and methods disclosed herein address these and other needs. Summary of the Invention

[0007] The present disclosure relates generally to packaging containers, and more specifically to printable paper for use as commercial protective bags. Commercial protective bags are used, for example, for the transportation of apparel and non-fragile goods. The present disclosure provides an environmentally sustainable alternative to protective bags made from plastic and other non-recyclable materials while providing an attractive aesthetic, as well as a level of durability, water resistance, weight, and overall performance important for commercial applications.

[0008] The printable paper comprises a cellulosic substrate having a first surface and a second surface opposite the first surface, the printable paper having a thickness of 20 g / m 2 and the first surface, the second surface, or both have a surface energy greater than 37 dynes / cm. In some embodiments, the printable paper is repulpable in accordance with the Fiberboard Association Voluntary Standard for Repulping and Recycling Corrugated Fiberboard Treated to Improve its Performance in the Presence of Water and Water Vapor August 16, 2013: Appendix A: Repulpability. In certain embodiments, the printable paper has a 2 minute Cobb sizing value of less than 100% by weight as determined by TAPPI T494. f / in or at least 70 lb f / in tensile strength (MD). Printable paper is 120lbs / 3000ft 2 or less than 60lbs / 3000ft 2 ~120lbs / 3000ft 2In some embodiments, the printable paper may have a basis weight of 15 g / m 2 In certain embodiments, the first surface, the second surface, or both have a surface energy of between 40 dynes / cm and 45 dynes / cm. The printable paper has a surface energy of at least 200 J / m2 as determined by TAPPI T494. 2 In some embodiments, the printable paper exhibits a tear resistance (MD) of at least 170 gf as determined by TAPPI T414. In specific embodiments, the tensile strength (N / m) is proportional to the basis weight (g / m 2 The tensile index (MD), defined by dividing the strain by the strain rate, is 70 to 95 Nm / g. Printable paper has a strength of 120 lbs / 3000 ft 2 The following basis weight (e.g. 60lbs / 3000ft 2 ~120lbs / 3000ft 2 , 69lbs / 3000ft 2 ~120lbs / 3000ft 2 , or 60lbs / 3000ft 2 ~100lbs / 3000ft 2 ), can be manufactured with strength properties well suited for commercial protective bag applications.

[0009] In a specific embodiment, the cellulosic substrate (also referred to herein as base sheet or base stock) may be manufactured with a fiber feed comprising at least 50% by weight post-consumer waste (PCW, e.g., PCW having up to 30% by weight bleached softwood and up to 70% by weight bleached hardwood) and at least 40% by weight softwood pulp. The softwood pulp preferably comprises at least 75% black spruce fiber. For example, the cellulosic substrate may comprise 50% PCW and 50% Northern Bleached Softwood Kraft Paper (NBSK), which is composed primarily (>75%) of spruce fiber. The use of bleached fiber provides an opportunity to produce custom colors for brand differentiation. Overall, the cellulosic substrate may be obtained from at least 60% by weight softwood and up to 40% by weight hardwood.

[0010] In certain embodiments, the cellulosic substrate includes a dry strength additive. In certain embodiments, the dry strength additive includes a cationic starch and a polyacrylamide resin. The cationic starch and polyacrylamide resin may be added to the wet side of a paper machine. Suitable cationic starches include quaternary ammonium cationic starches, tertiary amino cationic starches, or combinations thereof. The cationic starch may be present in an amount of at least 1%, or 1% to 2.5% by weight of the cellulosic substrate. Suitable polyacrylamide resins may include anionic or cationic polyacrylamide resins, such as glyoxalated polyacrylamide resins (Hercobond 1000 available from Solenis), or anionic polyacrylamide-acrylic acid (Hercobond 2000 available from Solenis). The polyacrylamide resin may be present in an amount of at least 0.1%, 0.1% to 0.5%, or 0.2% to 0.4% by weight of the cellulosic substrate.

[0011] In some examples, the printable paper further comprises a barrier coating on the first surface of the cellulosic substrate. The barrier coating has a thickness of about 2 g / m 2 ~20g / m 2 , 2g / m 2 ~15g / m 2 , or 5 g / m 2 ~12g / m 2In certain examples, the printable barrier coating may have a coating weight of 0.1 to 1.0 mm. In certain examples, the printable barrier coating is derived from a water-based polymer. In certain examples, the water-based polymer coating includes an acrylic homopolymer, an acrylic copolymer, a polyester acrylic copolymer, a vinyl acrylic copolymer, a wax emulsion, or a combination thereof. The printable barrier coating may be surface treated with a high energy discharge, and in some examples, the printable barrier coating may be surface treated using a corona treatment. Corona treatment may increase the surface energy (dyne level) to a range that is acceptable for most printing and adhesion processes while still maintaining protection from wet environments. Corona treatment may also create crosslinks on the barrier surface that reduce interdiffusion of polymer chains, thereby altering the failure mode of the material. In some examples, the printable barrier coating further includes inorganic particles, such as silica. In certain examples, the inorganic particles are surface treated. Barrier coatings are provided to protect from moist environments, but generally impart a low surface energy to the coated substrate, thus retarding water penetration and impairing printability (including ink absorption and drying) and adhesion of low temperature liquid pressure sensitive adhesives, hot melts, and pressure sensitive adhesives used to manufacture the protective pouches.

[0012] In some examples, the printable paper further comprises a back coating on the second surface of the cellulosic surface. In certain embodiments, the back coating comprises a film-forming hydrophilic polymer. Examples of suitable film-forming hydrophilic polymers include polyvinyl alcohol, polyester elastomers, natural polymers (e.g., starch, gum, or cellulose), or combinations thereof. The back coating may have a coating thickness of 0.1 g / m 2 ~5g / m 2 , or 0.2 g / m 2 ~2g / m 2 or may have a thickness of 1 to 75 micrometers or 1 to 25 micrometers.

[0013] Also provided herein are protective shipping pouches derived from the printable papers described herein. In some embodiments, the entire protective shipping pouch is derived from the printable paper. In certain embodiments, the protective shipping pouch is an envelope.

[0014] Also provided herein is a reusable flexible packaging container comprising a printable paper comprising a cellulosic substrate, wherein a first surface forms an exterior surface of the container, and a second surface forms an interior surface of the container and defines a product volume. In some examples, all materials forming the container are recyclable in a single stream. In certain examples, the container is an envelope. Also provided herein is a method of making a reusable flexible packaging container comprising a printable paper as described herein, comprising forming an exterior surface of the container comprising a first surface, and forming an interior surface of the container comprising a second surface, wherein the second surface defines a product volume.

[0015] The reusable packaging container provides a lightweight fiber-based protective bag option that is moisture resistant and repulpable. More specifically, the present disclosure provides advantages over existing fiber-based packaging containers in terms of weight, water resistance, durability, reusability, aesthetics, and the incorporation of post-consumer waste fibers in its construction. The cellulosic substrate provides strength and durability. Tensile strength, tensile energy absorption, tear strength, and burst strength are maximized through fiber type selection, refining methods, and the use of cationic starch and polyacrylamide dry strength resins. The internal sizing of the base stock may provide durability of the surface barrier coating while allowing backside water penetration to ensure repulpability. For example, a barrier coating is applied to one side of the base stock to provide protection from rain, snow, and wet environments.

[0016] The details of one or more embodiments are set forth in the description below. Other features, objects, and advantages will become apparent from the description and the claims. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The present disclosure relates, inter alia, to printable paper for transport packaging. The printable paper comprises a cellulosic substrate having a first surface and a second surface opposite the first surface. In some embodiments, the printable paper further comprises a barrier coating on the first surface of the cellulosic substrate. The present disclosure also relates to protective transport bags, such as those obtained from the printable paper, and reusable flexible packaging containers, such as those that include the printable paper. Methods for making reusable flexible packaging containers are also disclosed herein.

[0018] Cellulosic Substrate The cellulosic substrate may comprise any of a variety of different materials. In some embodiments, for example, the cellulosic substrate comprises a fibrous web formed from a cellulosic fibrous material. As used herein, the term "cellulosic fibrous material" generally refers to a material that contains wood pulp or other non-wood-derived fiber sources (e.g., at least about 65% by weight, at least about 75% by weight, at least about 85% by weight, at least about 95% by weight, or up to 100% by weight of the total fibers in the web are cellulose).

[0019] Pulp can be primary fibrous material, secondary fibrous material ("recycled") such as consumer waste, or a combination thereof. Sources of pulp fiber include, by way of example, wood, such as softwoods and hardwoods; straw and grasses, such as rice, esculenta, wheat, rye, and sabai; rattan and reeds, such as bagasse; bamboo; woody stems, such as jute, flax, kenaf, and hemp; bast, such as linen and ramie; leaves, such as abaca and sisal; and seeds, such as cotton and cotton liner. Softwoods and hardwoods are the more commonly used sources of cellulose fiber. Examples of softwoods include, by way of example only, pines (e.g., long pine, echinata pine, loblolly pine, slash pine, southern pine), black spruce, white spruce, jack pine, balsam fir, Douglas fir, western hemlock, sequoia, red cedar, northern softwood, southern softwood, hemlock, spruce (e.g., black spruce), combinations thereof, and the like. Examples of hardwoods include, by way of example only, aspen, birch, beech, oak, maple, eucalyptus, and gum. Specific examples of such pulp fibers include softwood pulps available as northern bleached softwood kraft (NBSK) pulp.

[0020] Different cellulose fibers can be selected to provide different attributes. The choice of fiber source depends in part on the final application of the web. For example, softwood fibers can be included in the web to increase tensile strength. Hardwood fibers can be selected for their ability to improve uniformity of fiber formation or distribution. The cellulosic substrate can, in certain embodiments, be at least about 50% softwood fiber by weight, at least about 60% by weight (i.e., about 65% to about 95% by weight, about 75% to about 90% by weight, or about 75% to about 85% by weight), etc. (based on the total dry weight of the cellulosic fibers in the web). In one particular embodiment, the softwood fibers can form substantially 100% by weight of the total cellulosic fibers in the cellulosic substrate (i.e., consist essentially of softwood cellulose fibers) without the presence of any significant amount of hardwood fibers. The cellulosic substrate, in certain embodiments, can be less than about 50% by weight hardwood fiber, less than about 45% by weight (based on the total dry weight of the cellulosic fibers in the web) (i.e., from about 15% to about 45% by weight, from about 20% to about 40% by weight, or from about 25% to about 40% by weight), etc.

[0021] In certain examples, the cellulosic substrate may be made with a fiber feed that includes at least 50% by weight post-consumer waste (e.g., containing about 15% to about 50% by weight bleached softwood fiber and about 50% to about 85% by weight bleached hardwood fiber) and up to 50% by weight softwood pulp. The softwood pulp preferably includes at least 75% spruce fiber. For example, the cellulosic substrate may include 50% post-consumer waste and 50% Northern Bleached Softwood Kraft (NBSK) paper, which is composed primarily (>75%) of spruce fiber. The use of bleached fiber provides an opportunity to produce custom colors for brand differentiation.

[0022] In some embodiments, the cellulosic substrate has a resistance of 120 lbs / 3000 ft 2 Less than (e.g. 115lbs / 3000ft 2 Below, 110lbs / 3000ft 2 Below 105lbs / 3000ft 2 Below 100lbs / 3000ft2 Below 95lbs / 3000ft 2 Below 90lbs / 3000ft 2 Below, 85lbs / 3000ft 2 Below 80lbs / 3000ft 2 Below, 75lbs / 3000ft 2 Below, 70lbs / 3000ft 2 Below 65lbs / 3000ft 2 Below 60lbs / 3000ft 2 Below 55lbs / 3000ft 2 or less than 50lbs / 3000ft 2 In some embodiments, the cellulosic substrate may have a basis weight of 45 lbs / 3000 ft or less. 2 or more (e.g., 50lbs / 3000ft 2 Over 55lbs / 3000ft 2 Over 60lbs / 3000ft 2 Over 65lbs / 3000ft 2 Over 70lbs / 3000ft 2 Over 75lbs / 3000ft 2 Over 80lbs / 3000ft 2 Over 85lbs / 3000ft 2 Over 90lbs / 3000ft 2 Over 95lbs / 3000ft 2 Over 100lbs / 3000ft 2 Over 105lbs / 3000ft 2 Over 110lbs / 3000ft 2 lbs / 3000ft 2 Over 115lbs / 3000ft 2 or 120lbs / 3000ft 2 In some embodiments, the cellulosic substrate has a basis weight of 50 lbs / 3000 ft or more. 2 ~120lbs / 3000ft 2 (For example, 60lbs / 3000ft 2 ~120lbs / 3000ft 2 , 70lbs / 3000ft 2 ~110lbs / 3000ft 2, 70lbs / 3000ft 2 ~100lbs / 3000ft 2 , or 75lbs / 3000ft 2 ~100lbs / 3000ft 2 ) basis weight.

[0023] Strength Additives Strength additives may be included in cellulosic substrates to improve dry and temporary wet strength, retention and drainage, productivity, reduce basis weight, improve energy efficiency, reduce feed costs, and increase felt life. Strength additives may typically provide more or less long-term moisture resistance for thin paper sheet structures. In some instances, high strength is desirable for paper applications, but papers with such characteristics are often repulpable only under harsh conditions. For example, resins containing azetidinium functional groups generally present difficulties in recycling or recovering the paper by repulping it back to individual fibers. Repulping such paper requires exposure to sufficient physical forces to break the fiber network while treating it under appropriate thermal and chemical conditions to cause amide hydrolysis. Other strength additives may possess better repulpability, but their strength may not be as high as that obtained with other strength resins.

[0024] The strength additives included in the paper described herein may be cationic, nonionic, anionic, or amphoteric water-soluble resins that are ideally suited for use as wet and dry strength resins that are self-supporting on paper and impart improved dry strength and effective wet strength to the paper. Dry strength additives include those discussed herein that improve the dry strength of the material. Furthermore, paper containing the strength additives described herein pulps faster in some instances than paper containing essentially the same, but conventional, dry and wet strength resins. Preferably, the strength additives used in the cellulosic substrates described herein may include anionic or cationic polyacrylamide resins, such as those available under the trade name Hercobond®. Specific examples include cationic glyoxylated polyacrylamide and anionic polyacrylamide-acrylic resins. Additional examples of strength additives include, but are not limited to, cationic starches, polyamide-polyamine-epichlorohydrin resins, polyaminoamide-epichlorohydrin resins, polyethyleneimine and aminoplast resins, modified starches and other polysaccharides (such as amphoteric and anionic starches), guar and locust bean gums, modified polyacrylamides, carboxymethylcellulose, sugars, polyvinyl alcohol, chitosan, modified polyamines, and cellulase enzymes.

[0025] In some embodiments, the cellulosic substrate may include cationic starch. Cationic starch can improve paper strength, water drainage, retention, improve paper quality, reduce waste, lint, and size addition, and reduce breaks in the paper web and improve paper machine runnability and productivity due to better control of the papermaking process. Cationic starch also reduces feed costs because it allows for the use of fillers and more recycled fiber. As a strength additive, cationic starch improves stiffness, opacity, print quality, and brightness. Commercially available cationic starches include quaternary ammonium cationic starch and tertiary amino cationic starch. Quaternary ammonium starch is cationic in all pH ranges, while tertiary amino starch is only cationic in the acidic range.

[0026] The cationic starch strength additive may be included in the cellulosic base material in an amount by weight based on the weight of the cellulosic base substrate of 0.1% or more, 0.2% or more, 0.4% or more, 0.5% or more, 0.8% or more, 1% or more, 1.5% or more, 2% or more, 2.5% or more, 3% or more, 4% or more, or 5% or more.

[0027] In some embodiments, the cellulosic substrate may include anionic or cationic polyacrylamide resins. Cationic and anionic polyacrylamide strength additives are available from Hercules Incorporated of Wilmington, Del. The addition of the polymer adds charge to the cellulosic fibrous slurry and aids in the creation of a composite that imparts both durability and strength to the finished cellulosic fibrous sheet.

[0028] The polyacrylamide strength additive can be included in the cellulosic based substrate in an amount of 0.1 wt.% or more, 0.2 wt.% or more, 0.4 wt.% or more, 0.5 wt.% or more, 0.8 wt.% or more, 1 wt.% or more, 1.5 wt.% or more, 2 wt.% or more, 2.5 wt.% or more, 3 wt.% or more, 4 wt.% or more, or 5 wt.% or more, based on the weight of the cellulosic based substrate.

[0029] Other additives may also be present in the cellulosic-based substrate, such as processing agents, including, but not limited to, thickeners, dispersants, emulsifiers, viscosity modifiers, humectants, pH modifiers, among others.

[0030] Barrier Coating In some embodiments, the printable paper may further comprise a barrier coating on the first surface of the cellulosic substrate. For example, it is current practice to add a film of polyethylene (PE), polypropylene (PP), polyester, wax, or polyvinylidene chloride (PVDC) on the paper substrate to provide a moisture barrier. However, traditional barrier coatings are not repulpable, mainly because they lead to quality issues in the fiber recovery process, either by disrupting the process (e.g., plugging filter screens) or by contaminating the finished product. For environmental and cost reasons, disposal of moisture barrier packaging materials has become a significant issue for paper mills and their customers. Repulping of these materials poses special problems for the industry. The moisture barrier layer reveals a problem in recovering useful fibers from the packaging. Currently, nearly all of these packages end up in landfills or incinerated, which creates environmental and public health concerns. Reprocessing of packaging to recover wood fibers is an important source of wood fibers and helps avoid the waste of high-quality, expensive fibers.

[0031] Cellulosic substrates may include barrier coatings that may provide high barrier performance, printability, high performance adhesion, strength, repulpability, and low manufacturing costs. The term "barrier" is used to describe the ability of a coating to stop or slow the passage of atmospheric gases, filler gases, water vapor, volatile aromas, and / or perfume ingredients, or combinations thereof.

[0032] Preferably, the barrier coatings described herein are water resistant. The water resistance of a barrier coating can be tested with the Cobb method described in TAPPI T441, which is incorporated herein by reference in its entirety. This method determines the amount of water absorbed by paper in a specific time under standardized conditions, and in some embodiments, the coated substrates described herein pass the water resistance test described in this test method. A barrier coating that provides a barrier against water and moisture must also have the ability to form a seal and not block during the manufacturing process. For example, the paper of a protective bag for shipping must be able to seal when the paper sides are joined, and the seal itself must also be resistant to and maintain its integrity in the presence of liquids or water vapor.

[0033] The barrier coating is desirably printable. Printability is an important attribute of packaging targeted to retail or point of sale. Printability is the ability of a material to produce high quality prints. Printability is judged by print quality and uniformity of ink transfer, speed of ink wetting and drying, ink receptivity, compressibility, smoothness, opacity, color, pick resistance, and similar factors. It is generally preferred if the material can be printed on a variety of equipment, maximizing the quality of the print and minimizing the cost of production. Printing techniques include flexo, gravure, heatset, thermal transfer, offset, offset lithography, non-contact laser, inkjet, ultraviolet, hot stamp, screen, silk screen. Overall, a printable barrier coating preferably provides a barrier against moisture, oxygen, oil, and fatty acids, as well as mechanical performance, aesthetics, decorativeness, resistance to chemicals, recyclability, surface energy, ink adhesion, ink wetting, film adhesion to fabrics, and improved surface for pressure sensitive and adhesive applications.

[0034] The printable barrier coating described herein can be derived from a water-based polymer and is present on at least one surface of a cellulosic substrate. The water-based polymer coating can include a water-based polymer that is water-soluble and / or water-dispersible. In some embodiments, the water-based polymer can include an acrylic homopolymer, an acrylic copolymer, a polyester acrylic copolymer, a vinyl acrylic copolymer, a wax emulsion, or a combination thereof. In some examples, the water-based polymer coating can be derived from consumer waste such as recycled PET containers. Specific examples of water-based polymer coatings include commercially available acrylic copolymers from Michelman (e.g., MC40EAF), commercially available acrylic polymers from BASF (e.g., Acronal NX4612X), and commercially available polyester acrylate copolymers from Ulterion International (e.g., Ulterion560Flex, a polyester acrylate copolymer derived from recycled PET containers).

[0035] The printable barrier coating can comprise the waterborne polymer in an amount of at least 60% by weight (e.g., at least 65% by weight, at least 70% by weight, at least 75% by weight, at least 80% by weight, at least 85% by weight, at least 90% by weight, at least 95% by weight, at least 97% by weight, at least 99% by weight, or up to 100% by weight) of the printable barrier coating.

[0036] The barrier coating may further include one or more additives in some embodiments. In some embodiments, the one or more additives may include inorganic particles (also referred to herein as pigments or mineral pigments). In some embodiments, inorganic particles may be added to impart specific properties to the paper, such as smoothness, whiteness, increased density or weight, reduced porosity, increased opacity, flatness, gloss, water adsorption (low surface tension or contact angle) or water repellency (high surface tension or contact angle). The inorganic particles may undergo a treatment process to promote the desired properties. For example, pigments may be surface treated with materials that may include, but are not limited to, surfactants, hydrophobic or hydrophilic modified polymers such as polyethyleneimine (PEI), acrylic emulsion chemicals, silanes or siloxanes, or combinations thereof.

[0037] The inorganic particles may include metal oxide microparticles or nanoparticles (such as aluminum oxide (Al2O3), aluminum dioxide (AlO2), zinc oxide (ZnO)), calcium carbonate, kaolin, clay, talc, diatomaceous earth, mica, barium sulfate, magnesium carbonate, vermiculite, graphite, carbon black, alumina, silica, colloidal silica, silica gel, titanium oxide, aluminum hydroxide, aluminum trihydrate, satin white, magnesium oxide, or combinations thereof. In some embodiments, the inorganic particles include silica (SiO2). Without wishing to be bound by theory, it is believed that the inorganic microparticles add affinity to the ink of the image printed on the printable barrier coating. For example, it is believed that the metal oxide porous microparticles (e.g., SiO2) can rapidly absorb ink liquids (e.g., water and / or other solvents) and retain ink molecules upon drying, even after exposure to organic solvents. In addition, it is believed that the metal oxide microparticles (e.g., SiO2) may provide additional available binding sites for the oxide that can bond (covalently or ionic) and / or interact (e.g., van der Waals forces, hydrogen bonding, etc.) with the ink binder and / or pigment molecules in the ink. This bonding and / or interaction between the molecules of the ink composition and the oxide of the microparticles may improve the durability of the ink printed on a printable surface.

[0038] The inorganic particles may have an average diameter on the micrometer (micron or μm) scale, such as from about 1 μm to about 20 μm. Such microparticles may provide a large enough surface area to interact with the ink composition applied to the printable coating while remaining sufficiently smooth on the exposed surface. In addition, microparticles that are too large may result in a grainy image on the printable coating and / or reduce the clarity of any image applied thereto. In a particular embodiment, the printable coating may include a first plurality of inorganic microparticles having a first average diameter and a second plurality of inorganic microparticles having a second average diameter, the first average diameter being smaller than the second average diameter. For example, the first average diameter may be from about 1 μm to about 10 μm (e.g., from about 4 to about 6) and the second average diameter may be from about 8 μm to about 20 μm (e.g., from about 8 to about 10, such as from about 8 to about 9).

[0039] The printable barrier coating can include inorganic particles in an amount less than 40% by weight (e.g., less than 35%, less than 30%, less than 25%, less than 20%, less than 15%, less than 12%, less than 10%, less than 8%, less than 5%, less than 3%, or less than 2% by weight) of the printable barrier coating.

[0040] In some embodiments, the printable barrier coating may include additives such as thickeners, dispersants, emulsifiers, viscosity modifiers, humectants, pH modifiers, initiators, stabilizers, chain transfer agents, buffers, salts, preservatives, flame retardants, humectants, protective colloids, biocides, corrosion inhibitors, crosslinkers, crosslinking promoters, and lubricants. In some embodiments, the printable barrier coating may include one or more dyes and / or color pigments to produce colored or patterned paper or to modify the color shade of the paper. Exemplary dyes include basic dyes, acid dyes, anionic direct dyes, and cationic direct dyes. Exemplary color pigments include organic and inorganic pigments in the form of anionic and cationic pigment dispersions. The additives may be included in any amount, such as up to about 5% by weight, such as from about 0.1% to about 1% by weight.

[0041] As mentioned, a crosslinking agent may be present in the printable barrier coating to ensure that a highly crosslinked coating is formed. In particular, water-based polymers can react with a crosslinking agent to form a three-dimensional crosslinked material. Particularly suitable crosslinked polymer binders include those that contain reactive carboxyl groups. Exemplary crosslinking agents that contain carboxyl groups include acrylics, polyurethanes, ethylene-acrylic acid copolymers, and the like. Other desirable crosslinking agents include those that contain reactive hydroxyl groups. Crosslinking agents that may be used to crosslink binders with carboxyl groups include multifunctional aziridines, epoxy resins, carbodiimides, oxazoline functional polymers, and the like. Crosslinking agents that may be used to crosslink binders with hydroxyl groups include melamine-formaldehyde, urea formaldehyde, amine-epichlorohydrin, multifunctional isocyanates, and the like.

[0042] A crosslinking catalyst may also be present in the printable barrier coating to help ensure that sufficient crosslinking occurs during curing. For example, the crosslinking catalyst may be an imidazole curing agent. However, in certain embodiments, the coating may not include such a crosslinking catalyst.

[0043] Where the printable barrier coating is intended for use in receiving dye-based inks via inkjet printing, the printable coating may further comprise a cationic polyelectrolyte to function as a cationic dye fixing agent. If present, the printable coating may comprise from about 0.1% to about 5% by weight of the cationic dye fixing agent.

[0044] The printable barrier coating, in some embodiments, is greater than 2 g / m 2 or more (e.g., 3 g / m 2 More than 4g / m 2 More than 5g / m 2 More than 6g / m 2 More than 7g / m 2 More than 8g / m 2 More than 9g / m 2More than 10g / m 2 More than 11g / m 2 More than 12g / m 2 More than 13g / m 2 More than 14g / m 2 More than 15g / m 2 More than 16g / m 2 More than 17g / m 2 More than 18g / m 2 More than 19g / m 2 More than 20g / m 2 or more than 25g / m 2 The printable barrier coating may have a coating weight of 25 g / m or more in some embodiments. 2 Less than (e.g., 24 g / m 2 Below 23g / m 2 Below, 22g / m 2 Below, 21g / m 2 Below 20g / m 2 Below, 19g / m 2 Below 18g / m 2 Below, 17g / m 2 Below 16g / m 2 Below 15g / m 2 Below, 14g / m 2 Below 13g / m 2 Below, 12g / m 2 Below, 11g / m 2 Below 10g / m 2 Below, 9g / m 2 Below, 8g / m 2 Below, 7g / m 2 Below 6g / m 2 Below, 5g / m 2 Below, 4g / m 2 Less than or equal to 3g / m 2 The printable barrier coating may have a coating weight of 2 g / m or less in some embodiments. 2 ~20g / m 2 (For example, 5g / m 2 ~20g / m 2 , 2g / m 2 ~15g / m 2 , or 5 g / m 2 ~12g / m 2The coating weight can be reported in grams of coating per square meter of cellulosic substrate and can be calculated directly by the amount of coating applied and the surface area of ​​the cellulosic substrate to which the coating is applied.

[0045] The printable barrier coating can have a thickness of 0.5 mils or more (e.g., 0.6 mils or more, 0.7 mils or more, 0.8 mils or more, 0.9 mils or more, 1 mils or more, 1.1 or more, 1.2 or more, 1.3 or more, 1.4 or more, 1.5 or more, 1.6 or more, 1.7 or more, 1.8 or more, 1.9 or more). In some embodiments, the printable barrier coating has a thickness of 2 mils or less (e.g., 1.9 or less, 1.8 or less, 1.7 or less, 1.6 or less, 1.5 or less, 1.4 or less, 1.3 or less, 1.2 or less, 1 or less, 0.9 or less, 0.8 or less, 0.7 or less, or 0.6 or less). In some embodiments, the printable barrier coating has a thickness of 0.5 mils to 2 mils (e.g., 0.9 mils to 1.6 mils, 1.1 mils to 1.4 mils). The thickness of the coating can be calculated based on the density of the coating and the weight of the coated paper.

[0046] Surface Treatment In many cases, barrier coatings have good structural and other characteristics, but do not have sufficient printability or adhesive properties due to surface characteristics. Treatments may be necessary to change the surfaces of paper and other materials to make them more receptive to adhesives or printing inks. In some embodiments, barrier coatings can be oxidized, smoothed, or a combination thereof to improve adhesion. In some embodiments, the surface treatment may include a high-energy discharge, such as an ionizing discharge and / or a thermal discharge. As used herein, "high-energy discharge" refers to an energy source that can change the molecular bonds and / or energy on the surface of the material. In some embodiments, the energy source can break molecular bonds on the surface of the material. The broken bonds are thereby free to bond to free radicals and other particles present in the high-energy discharge environment. In some examples, the barrier coating may be surface treated (e.g., physical surface treatment or heat treatment) using a process selected from corona treatment, plasma discharge treatment, flame treatment, or a combination thereof. Surface treatment of the water-based polymer coating may improve, for example, heat sealing and / or surface adhesion between cellulosic substrate layers.

[0047] Corona treatment involves an electrical discharge process that creates ozone, which in turn oxidizes the substrate surface, creating polar sites that contribute to strong bond formation. Treatment levels are measured in dynes. A dyne in the (now deprecated) cgs unit system is the force required to accelerate one gram of mass at one centimeter per second per second. (1 dyne = 1 x 10 5 Newtons). Thus, in packaging, it is used as a measure of surface energy or polarity of a surface. Dyne level is an indication of the ability of a surface to be wetted by a liquid and form a chemical bond with an adhesive, coating, or ink. The dyne level of a surface should typically be 37 or higher, depending on the nature of the adhesive material. (ASTM D2578).

[0048] In some embodiments, the barrier coating is corona treated at a suitable power. The barrier coating may be corona treated at a power level of 1 watt or greater. In some embodiments, the barrier coating is corona treated at a power level of 1 to 4 watts per square foot per minute (e.g., 2 watts or greater, 2.5 watts or greater, 3 watts or greater, or 3.5 watts or greater). In some embodiments, the barrier coating is corona treated at 4 watts or less (e.g., 3.5 watts or less, 3 watts or less, 2.5 watts or less, or 2 watts or less). In some embodiments, the barrier coating is corona treated at 2 to 4 watts per square foot per minute. The exposure time of the barrier coating on the cellulosic substrate to the corona treatment may be very short. For example, the exposure time may be less than 1 second. In some embodiments, the corona treatment may be performed on a moving paper substrate web running on a coating line. In some embodiments, the barrier coating may be corona treated on a coating line using a line speed of 100 ft / min or greater. For example, the barrier coating may be corona treated using a line speed of from 500 ft / min to 5000 ft / min, such as from 500 ft / min to 1000 ft / min.

[0049] Increasing the surface energy can increase the wettability and adhesive characteristics of the surface. Once the watt density that will drive a water-based polymer coating to a particular dyne level is known, it can be used to predict the results of changes in parameters such as line speed, if any.

[0050] Backside Coating In some aspects, the cellulosic substrate has high dimensional stability with reduced tendency to curl. In some embodiments, a film-forming polymer can be coated on the backside of the cellulosic substrate (the surface opposite the barrier coated side). Preferably, the film-forming polymer is bio-based, with at least 80% by weight of the polymer film being derived from non-petroleum or bio-renewable feedstocks.

[0051] Examples of film-forming polymers that may reduce curvature include polyvinyl alcohol (PVOH), polyvinylamine, alginates, polyester elastomers, naturally-based polymers (eg, starch, gums, cellulose, carboxymethyl cellulose), and the like.

[0052] The back coating, in some embodiments, is 0.2 g / m 2 or more (e.g., 0.3 g / m 2 More than 0.4g / m 2 More than 0.5g / m 2 More than 0.6g / m 2 More than 0.7g / m 2 More than 0.8g / m 2 More than 0.9g / m 2 More than 1.0g / m 2 More than 1.1g / m 2 More than 1.2g / m 2 More than 1.3g / m 2 More than 1.4g / m 2 More than 1.5g / m 2 More than 1.6g / m 2 More than 1.7g / m 2 More than 1.8g / m 2 More than 1.9g / m 2 More than 2.0g / m 2 More than 2.1g / m 2 More than 2.2g / m 2 More than 2.3g / m 2 More than 2.4g / m 2 More than 2.5g / m 2 More than 2.6g / m 2 More than 2.7g / m 2 More than 2.8g / m 2 or more, or 2.9 g / m 2 The back coating may have a coating weight of 5.0 g / m or more in some embodiments. 2 Less than (e.g., 3.0 g / m 2 Below 2.8g / m 2 Below 2.7g / m 2 Below, 2.6g / m 2 Below 2.5g / m 2 Below 2.4g / m 2 Below, 2.3g / m2 Below, 2.2g / m 2 Below, 2.1g / m 2 Below 2.0g / m 2 Below, 1.9g / m 2 Below 1.8g / m 2 Below 1.7g / m 2 Below 1.6g / m 2 Below 1.5g / m 2 Below 1.4g / m 2 Below 1.3g / m 2 Below 1.2g / m 2 Below, 1.1g / m 2 Below 1.0g / m 2 Below, 0.9g / m 2 Below, 0.8g / m 2 Below, 0.7g / m 2 Below, 0.6g / m 2 Below 0.5g / m 2 Below 0.4g / m 2 less than or equal to 0.3g / m 2 In some embodiments, the back coating may have a coating weight of 0.2 g / m or less. 2 ~3.0g / m 2( For example, 0.5 g / m 2 ~2.8g / m 2 , or 1.0 g / m 2 ~2.5g / m 2) The coating weight may be

[0053] Printable paper, transport bags and packaging As described herein, the printable paper of the present disclosure is repulpable. The process of repulping refers to any mechanical action that disperses dry pulp fibers into an aqueous pulp fiber suspension. The conditions for repulping, as well as the equipment used commercially, are in accordance with the Fiberboard Association Voluntary Standard for Repulping and Recycling Corrugated Fiberboard Treated to Improve its Performance in the Presence of Water and Water Vapor August 16, 2013: Appendix A: Repulpability, which reference is incorporated herein by reference in its entirety.

[0054] In some embodiments, the printable paper may be repulpable in accordance with the Fiberboard Association Voluntary Standard for Repulping and Recycling Corrugated Fiberboard Treated to Improve its Performance in the Presence of Water and Water Vapor August 16, 2013: Appendix A: Repulpability.

[0055] With the additional components described herein, printable paper can be produced up to 120 lbs / 3000 ft 2 For example, printable papers can be manufactured with strength properties well suited for commercial protective bag applications, having a basis weight of 118 lbs / 3000 ft 2 The following basis weight (e.g. 115lbs / 3000ft 2 Below, 110lbs / 3000ft 2 Below 105lbs / 3000ft 2 Below 100lbs / 3000ft 2 Below 95lbs / 3000ft 2 Below 90lbs / 3000ft 2Below, 85lbs / 3000ft 2 Below 80lbs / 3000ft 2 Below, 75lbs / 3000ft 2 Below, 70lbs / 3000ft 2 Below 65lbs / 3000ft 2 Below 60lbs / 3000ft 2 Below 55lbs / 3000ft 2 or less than 50lbs / 3000ft 2 In some embodiments, the printable paper may have a thickness of 45 lbs / 3000 ft or less. 2 or more (e.g., 50lbs / 3000ft 2 Over 55lbs / 3000ft 2 Over 60lbs / 3000ft 2 Over 65lbs / 3000ft 2 Over 70lbs / 3000ft 2 Over 75lbs / 3000ft 2 Over 80lbs / 3000ft 2 Over 85lbs / 3000ft 2 Over 90lbs / 3000ft 2 Over 95lbs / 3000ft 2 Over 100lbs / 3000ft 2 Over 105lbs / 3000ft 2 Over 110lbs / 3000ft 2 lbs / 3000ft 2 Over 115lbs / 3000ft 2 or 120lbs / 3000ft 2 In some embodiments, the printable paper has a basis weight of 50 lbs / 3000 ft 2 ~120lbs / 3000ft 2 (For example, 60lbs / 3000ft 2 ~120lbs / 3000ft 2 , 70lbs / 3000ft 2 ~110lbs / 3000ft 2 , 70lbs / 3000ft 2 ~100lbs / 3000ft 2 , or 75lbs / 3000ft2 ~100lbs / 3000ft 2 ) basis weight.

[0056] The printable paper is 20 g / m2 as determined by TAPPI T441. 2 For example, printable paper may exhibit a 2-minute Cobb sizing value of less than 20 g / m 2 The following 2-minute cob sizing values ​​(e.g. 19 g / m 2 Below 18g / m 2 Below, 17g / m 2 Below 16g / m 2 Below 15g / m 2 Below, 14g / m 2 Below 13g / m 2 Below, 12g / m 2 Below, 11g / m 2 Below 10g / m 2 Below, 9g / m 2 Below, 8g / m 2 Below, 7g / m 2 Below 6g / m 2 Below, 5g / m 2 Below, 4g / m 2 Less than or equal to 3g / m 2 The printable paper is 0.2 g / m 2 ~20g / m 2 (For example, 0.2 g / m 2 ~18g / m 2 , 0.2g / m 2 ~15g / m 2 , or 2 g / m 2 ~10g / m 2 ) of 20 g / m2 as determined by TAPPI T441 2 may exhibit a 2 minute Cobb sizing value of less than 0.05.

[0057] The printable paper may exhibit a tensile strength (MD) as determined by TAPPI T494 of at least 45 lbf / in (e.g., at least 45 lbf / in, at least 55 lbf / in, or at least 65 lbf / in), or at least 70 lbf / in (e.g., at least 70 lbf / in, at least 80 lbf / in, at least 90 lbf / in, at least 100 lbf / in, at least 110 lbf / in, at least 120 lbf / in, at least 130 lbf / in, at least 140 lbf / in, at least 150 lbf / in, at least 160 lbf / in, at least 170 lbf / in, at least 180 lbf / in, at least 190 lbf / in, or at least 200 lbf / in).

[0058] The printable paper may exhibit a tensile strength (CD) as determined by TAPPI T494 of at least 30 lbf / in (e.g., at least 30 lbf / in, at least 40 lbf / in, at least 50 lbf / in, at least 60 lbf / in, at least 70 lbf / in, at least 80 lbf / in, at least 90 lbf / in, at least 100 lbf / in, at least 110 lbf / in, or at least 120 lbf / in).

[0059] Printable paper has a thermal conductivity of at least 200 J / m2 as determined by TAPPI T494. 2 (e.g., at least 210 J / m 2 , at least 215 J / m 2 , at least 220 J / m 2 , at least 230 J / m 2 , at least 240 J / m 2 , at least 250 J / m 2 , at least 260 J / m 2 , at least 270 J / m 2 , at least 280 J / m 2 , at least 290 J / m 2 , or at least 300 J / m 2 ) tensile energy absorption (MD).

[0060] Printable paper has a printability of at least 340 J / m2 as determined by TAPPI T494. 2 (e.g., at least 345 J / m 2 , at least 350 J / m 2 , at least 355 J / m 2 , at least 360 J / m 2 , at least 365 J / m 2 , at least 370 J / m 2 , at least 375 J / m 2 , at least 380 J / m 2 , at least 385 J / m 2 , at least 390 J / m 2 , at least 395 J / m 2 , at least 400 J / m 2 , or at least 405 J / m 2 ) tensile energy absorption (CD).

[0061] The printable paper may exhibit a tear resistance (MD) as determined by TAPPI T414 of at least 170 gf (e.g., at least 175 gf, at least 180 gf, at least 190 gf, at least 200 gf, at least 210 gf, at least 215 gf, at least 220 gf, at least 230 gf, at least 235 gf, at least 240 gf, at least 250 gf).

[0062] The printable paper may exhibit a tear resistance (CD) as determined by TAPPI T414 of at least 180 gf (e.g., at least 185 gf, at least 190 gf, at least 195 gf, at least 200 gf, at least 205 gf, at least 210 gf, at least 215 gf, at least 220 gf, at least 225 gf, at least 230 gf, at least 235 gf).

[0063] Printable papers are classified according to their tensile strength (N / m) and basis weight (g / m 2) of 70 to 95 Nm / g (e.g., 75 Nm / g to 90 Nm / g, 80 Nm / g to 88 Nm / g, or 82 Nm / g to 86 Nm / g).

[0064] Printable papers are classified according to their tensile strength (N / m) and basis weight (g / m 2 ) of 40 to 60 Nm / g (e.g., 45 Nm / g to 55 Nm / g or 47 Nm / g to 51 Nm / g).

[0065] The first surface, the second surface, or both of the printable paper may exhibit a surface energy of from 37 dynes / cm to greater than 60 dynes / cm (e.g., greater than 37 dynes / cm, greater than 40 dynes / cm, greater than 45 dynes / cm, greater than 50 dynes / cm, or greater than 55 dynes / cm, or from 37 dynes / cm to 45 dynes / cm, or from 40 dynes / cm to 45 dynes / cm).

[0066] The printable paper can be used to create a protective shipping bag. In some embodiments, the protective shipping bag can be derived from the printable paper disclosed herein. In some embodiments, the entire protective shipping bag can be derived from the printable paper. In further embodiments, the protective shipping bag can be an envelope.

[0067] The printable paper can be used to make a reusable flexible packaging container, at least a portion or the entire packaging container is obtained from the printable paper. The reusable flexible packaging container can be a protective bag for shipping, such as an envelope. For example, provided herein is a reusable flexible packaging container including an inner surface defining a product volume, the inner surface being obtained from a cellulose-based substrate as described herein, and an outer surface opposite the inner surface having a surface energy of greater than 37 dynes / cm.

[0068] The reusable flexible packaging is preferably single-stream recyclable, such as through general waste recycling. For example, the reusable flexible packaging is repulpable in accordance with the Fiberboard Association Voluntary Standard for Repulping and Recycling Corrugated Fiberboard Treated to Improve its Performance in the Presence of Water and Water Vapor August 16, 2013: Appendix A: Repulpability.

[0069] These and other modifications and variations to the present invention may be practiced by those of ordinary skill in the art without departing from the spirit and scope of the present invention, which is particularly set forth in the appended claims. In addition, it should be understood that aspects of the various embodiments may be interchanged in whole or in part. Moreover, those skilled in the art will appreciate that the foregoing description is by way of example only, and is not intended to limit the invention, which is further set forth in the appended claims. EXAMPLES

[0070] Example 1: Protective bag Conventional fiber-based protective bags do not provide protection from water penetration, resulting in poor durability and a higher probability of product damage. Furthermore, these products are generally manufactured from poor quality fibers, resulting in poor strength / basis weight relationships. Thus, durability is achieved at the expense of increased protective bag weight, an important consideration for many brands. The present embodiment provides a sustainable alternative to plastic-based materials at a more competitive basis weight than currently available fiber-based products, and a material for packaging containers that can meet the rigors of commercial shipping (such as that of apparel) while providing novel performance advantages.

[0071] Premium Protective Bag Base Stock Several coated protective sack base stocks may be produced according to Table 1 or according to the parameters defined in Tables 2-5. The base stocks were produced according to standard papermaking procedures with a fiber feed containing 50% post-consumer waste (PCW) and 50% northern bleached softwood kraft paper (NBSK) composed primarily (>75%) of black spruce fiber. A combination of cationic starch and anionic polyacrylamide dry strength resin (Hercobond 2000) was added to the wet side of the paper machine. No calendering was required.

[0072] Following preparation of the base paper, the functional coatings were applied to one or both sides of the base paper. The topcoat (wire side) was an insulation coating having a coat weight ranging from 5.0 to 12.0 gsm. A 2% PVOH backside (felt side) coating was applied using an air knife pressure of approximately 3 psi to provide a flat, non-curling web. Standard coating application and drying conditions were maintained to achieve optimal barrier properties. [Table 1]

[0073] Table 2 shows the results of Trial 1 from the base stock production. [Table 2]

[0074] Table 3 shows the results for runs 1-5 from the coated base stock. [Table 3]

[0075] Table 4 shows the characteristics of the results from runs 1-4 from the coated base stock. [Table 4-1] [Table 4-2]

[0076] Repulpability test FBA repulpability testing was performed on four coated paper samples according to Voluntary Standard For Repulping and Recycling Corrugated Fiberboard Treated to Improve Its Performance in the Presence of Water and Water Vapor August 16, 2013: Appendix A: Repulpability. Samples were conditioned and tested at TAPPI standard conditions. Samples were prepared at 1" x 4" and several shorter sections were used to obtain an initial charge of 25 oven-dried grams. Tap water was used for repulping and screening. Oven-dried weights were used for initial charge, as well as for accepted and rejected items. Samples were screened through a 0.010" slotted valley screen for 20 minutes. Accepted items were screened using a 150 mesh T316 alloy stainless steel screen with an opening width of 0.0041".

[0077] The results from the repulpability testing are summarized in Table 5 below. [Table 5]

[0078] Results: At 34 dynes / cm, the surface energy of the base stock was too low for the water-based inks typically used in paper cone flexographic printing processes, resulting in poor ink absorption, drying defects, and excessive show-through. The optimal range for surface energy was estimated to be 40-45 dynes / cm.

[0079] As a result of the single-side (C1S) application of the barrier coating, the coated base stock exhibited CD-oriented curvature, which caused the central seam of the original protective bag to split, which was ultimately rectified by the compression inherent in the carton packaging.

[0080] The pressure sensitive adhesive used to close the envelope did not bond securely to the coated surface of the protective pouch base stock. As a result, fiber tear upon opening of the protective pouch was not achieved, a feature that would be tamper evident to most customers. As with the printing difficulties, this defect is believed to be due to low surface energy and can be corrected by increasing the surface energy of the coating.

[0081] The compositions and methods of the appended claims are not limited in scope by the specific compositions and methods described herein, which are intended as illustrations of some aspects of the claims, and any compositions and methods that are functionally equivalent are intended to fall within the scope of the claims. Various modifications of the compositions and methods in addition to those shown and described herein are intended to be within the scope of the appended claims. Furthermore, only certain representative compositions and method steps disclosed herein are specifically described, but other combinations of compositions and method steps are also intended to be within the scope of the appended claims even if not specifically recited. Thus, combinations of steps, elements, components, or components may be explicitly mentioned or less herein, but include other combinations of steps, elements, components, and components even if not explicitly described. As used herein, the term "comprises" and variations thereof are used synonymously with the term "include" and variations thereof, and are open-ended and non-limiting terms. Although the terms "comprising" and "including" are used herein to describe various embodiments, the terms "consisting essentially of" and "consisting of" may be used in place of "comprising" and "including" to provide more specific embodiments of the present invention, and are also disclosed. Other than in the examples, or where otherwise stated, all numbers expressing amounts of ingredients, reaction conditions, and the like used in the specification and claims are not intended to limit the application of the doctrine of equivalents to the scope of the claims, but should be understood, at a minimum, in light of the number of significant digits and ordinary rounding approaches.

Claims

1. A printable paper comprising: a cellulosic substrate having a first surface and a second surface opposite the first surface; and a printable barrier coating on the first surface of the cellulosic substrate; the printable barrier coating is derived from a water-based polymer; the printable barrier coating is surface treated with a high energy discharge; The printable paper is 20 g / m ２ has a 2 minute Cobb sizing value of less than A printable paper, wherein the first surface, the second surface, or both, have a surface energy greater than 37 dynes / cm.

2. 2. The printable paper of claim 1, wherein the printable paper is repulpable in accordance with the Fiberboard Association Voluntary Standard for Repulping and Recycling Corrugated Fiberboard Treated to Improve its Performance in the Presence of Water and Water Vapor August 16, 2013: Appendix A: Repulpability.

3. At least 45 lbs as determined by TAPPI T494 ｆ / in or at least 70 lb ｆ 13. The printable paper of any one of the preceding claims, exhibiting a tensile strength (MD) of 1.0 / in.

4. 120lbs / 3000ft ２ or less than 60 lbs / 3000 ft ２ ~120lbs / 3000ft ２ 2. The printable paper of any one of the preceding claims, having a basis weight of

5. The printable paper is 15 g / m ２ 20. The printable paper of any one of the preceding claims having a 2 minute Cobb sizing value of less than 100%.

6. A printable paper according to any one of the preceding claims, wherein the first surface, the second surface, or both, have a surface energy of between 40 dynes / cm and 45 dynes / cm.

7. The printable paper has a printability of at least 200 J / m as determined by TAPPI T494. ２ 13. The printable paper of any one of the preceding claims, exhibiting a tensile energy absorption (MD) of

8. 10. The printable paper of any one of the preceding claims, wherein the printable paper exhibits a tear resistance (MD) of at least 170 gf, as determined by TAPPI T414.

9. 10. The printable paper of any one of the preceding claims, wherein the cellulosic substrate comprises a dry strength additive, and wherein the dry strength additive comprises a cationic starch and a polyacrylamide resin.

10. 10. The printable paper according to any one of the preceding claims, wherein the printable blocking coating is surface treated using a corona treatment.

11. 10. The printable paper according to any one of the preceding claims, wherein the water-based polymer coating comprises an acrylic homopolymer, an acrylic copolymer, a polyester acrylic copolymer, a vinyl acrylic copolymer, a wax emulsion, or a combination thereof.

12. The printable barrier coating has a thickness of 2 g / m ２ ~20g / m ２ , 2 g / m ２ ~15g / m ２ , or 5 g / m ２ ~12g / m ２ 2. The printable paper according to any one of the preceding claims, having a coating weight of

13. 10. The printable paper of any one of the preceding claims, wherein the printable barrier coating further comprises inorganic particles.

14. The inorganic particles are 14. The printable paper of claim 13, which is surface treated, contains silica, or both.

15. The tensile strength (N / m) is ２ 4. The printable paper according to any one of the preceding claims, wherein the Tensile Index (MD), defined by dividing by the modulus of elasticity (M) by the modulus of elasticity (A), is between 70 and 95 Nm / g.