Method for improving grease and oil resistance of textile products

Abstract

A method for improving the grease and oil resistance of a molded textile product is provided. The method includes introducing a composition comprising at least one anionic polymer and a cationic polymer into a textile raw material and molding the textile raw material. Molded textile products and the use of the composition for improving the grease and oil resistance of molded textile products are also provided. A method for producing a molded textile product is also provided.

Description

[Technical Field]

[0001] The present disclosure (hereinafter referred to as the present disclosure) generally relates to a method for improving the grease and oil resistance of textile products. In particular, but not by way of limitation, the present disclosure relates to a method for improving the grease and oil resistance of textile products by shaping textile raw materials.

[0002] It should be noted that this section provides useful background information, but does not constitute an admission that the techniques described therein represent the state of the art.

[0003] Pollution from single-use plastic containers and packaging is widespread, damaging the world's landscapes and threatening delicate ecosystems and the life forms that inhabit them. Single-use packaging travels from waterways to oceans in the form of Styrofoam and expanded polystyrene (EPS) packaging, takeout containers, bottles, thin film bags, and photodegradable plastic pellets. Sustainable solutions to reduce plastic pollution are gaining momentum. However, sustained adoption requires that these solutions not only be environmentally beneficial, but also competitive in both performance and cost with fossil-fuel-based plastics.

[0004] For some brief background, molded paper pulp (fiber molding) has been used for packaging such as containers and trays since the 1930s, but its use declined in the 1970s with the advent of fossil-fuel-based foamed plastic packaging. Paper pulp can be produced from old newspapers, cardboard boxes, and other plant fibers. Today, molded pulp packaging is widely used for electronics, household goods, auto parts, and medical products, as well as for edge / corner protectors and pallet trays when transporting electronic and other fragile components.

[0005] Cellulose fiber-based packaging products are biodegradable and compostable, and unlike fossil-fuel-based plastics, do not end up in the ocean. However, currently known fiber technologies are not suitable for use as closures for meat and poultry, cooked and prepared foods, microwaveable foods, or beverage containers such as hot coffee.

[0006] Depending on the application of molded pulp, barrier properties against oil, grease, water, water vapor, oxygen, and / or other gases and liquids are required for various product types. The use of appropriate slurry chemicals can result in improved process efficiency, mechanical properties, barrier properties, and / or surface coating properties, making the production of molded pulp products more competitive with products made from flat board.

[0007] According to a first aspect, the present invention provides a method for improving the grease and oil resistance of a molded textile product, the method comprising: Obtaining a fiber stock comprising cellulosic fibers; introducing a composition into said fiber material; wherein the composition comprises at least one anionic polymer having a molecular weight of at least 100 kDa; · with cationic polymers; wherein the anionic polymer has a molecular weight of at least 100 kDa and the cationic polymer imparts to the composition a charge density in the range of 0.1 to 1.5 meq / g when measured at pH 2.8, and when measured as an aqueous solution at pH 7.0, -3~-0.1 meq / g, preferably -2.5~-0.3 meq / g, more preferably -2.0~-0.5 providing the composition with a charge density in the range of meq / g; In some embodiments, the method includes introducing polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof, to the fiber material; shaping the fiber raw material; Includes.

[0008] According to a second aspect, the present invention provides a molded fiber product comprising a composition comprising: at least one anionic polymer having a molecular weight of at least 100 kDa; · with cationic polymers; wherein the anionic polymer has a molecular weight of at least 100 kDa and the cationic polymer imparts to the composition a charge density in the range of 0.1 to 1.5 meq / g when measured at pH 2.8, and when measured as an aqueous solution at pH 7.0, -3~-0.1 meq / g, preferably -2.5~-0.3 meq / g, more preferably -2.0~-0.5 providing the composition with a charge density in the range of meq / g; In some embodiments, the composition comprises a polyamidoamine epichlorohydrin, a glyoxalated polyacrylamide, a starch, or a mixture thereof; In some embodiments, a pigment; wherein said shaped textile product is produced by a method according to the present invention.

[0009] According to a third aspect, the present invention provides the use of a composition comprising: at least one anionic polymer having a molecular weight of at least 100 kDa; · with cationic polymers; wherein the anionic polymer has a molecular weight of at least 100 kDa and the cationic polymer imparts to the composition a charge density in the range of 0.1 to 1.5 meq / g when measured at pH 2.8, and when measured as an aqueous solution at pH 7.0, -3~-0.1 meq / g, preferably -2.5~-0.3 meq / g, more preferably -2.0~-0.5 providing the composition with a charge density in the range of meq / g; In some embodiments, the composition comprises polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof; and Some embodiments include pigments to improve the grease and oil resistance of the molded fiber.

[0010] It has now been discovered that molded textiles (e.g., thermoformed textiles) containing a composition comprising at least one anionic polymer having a molecular weight of at least 100 kDa and a cationic polymer, the composition having a particular charge density, surprisingly have excellent oil resistance. Surprisingly, it has been found that the composition acts as an oil barrier in the textile. It is also believed that the composition acts as a grease barrier in the textile.

[0011] The composition has been found to exhibit excellent oil resistance to olive oil, i.e., the composition has been found to increase the penetration time of molded textiles by approximately 60 minutes compared to molded textiles not containing the composition. It is also believed that grease resistance, in terms of grease penetration time and / or uptake, is increased, as is oil uptake.

[0012] Additionally, it has been surprisingly found that molded textiles containing this composition and polyamidoamine epichlorohydrin (PAAE), glyoxalated polyacrylamide, starch, or mixtures thereof have even better oil resistance and are believed to have even better grease resistance.

[0013] The combination of polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof with the composition has been found to improve oil resistance compared to molded textiles without the use of the composition and polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, or a mixture thereof, i.e., an increase of about 200 minutes in penetration time and uptake into molded textiles (e.g., thermoformed textiles). It is also believed that grease resistance is improved.

[0014] Without being bound by any theory, it is believed that molded fiber products containing a composition including an anionic component and a cationic component capture, i.e., take in, or absorb / adsorb grease and oil components, and act as a grease barrier and an oil barrier.

[0015] The textile products of the present invention are at least partially biodegradable and compostable, preferably mostly biodegradable and compostable, and more preferably biodegradable and compostable.

[0016] It has also been surprisingly found that oil- and / or grease-resistant textiles can be produced in a simple and cost-effective manner. It has been found that grease- and / or oil-resistant textiles can be produced by introducing a composition containing at least one anionic polymer and a cationic polymer, the composition having a specific charge density, into a textile material containing cellulosic fibers, and then shaping (e.g., thermoforming) the textile material. In some embodiments, polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof is introduced prior to shaping.

[0017] Surprisingly, it has been found that by incorporating the composition into the textile raw material in large amounts (e.g., 5-50 kg / t based on the dry weight of the textile raw material), the resulting molded article has high oil resistance. Oil resistance is further increased by additionally incorporating polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof into the textile raw material. It is also believed that grease resistance is improved.

[0018] It has also surprisingly been found that the above-described molded textiles (e.g., thermoformed textiles) have improved tensile bending stiffness compared to molded textiles that do not include the composition, or the composition and polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof. The improved tensile bending stiffness allows for a reduction in the thickness of the molded textile, thereby reducing the mass per unit area of ​​the molded textile.

[0019] The thickness and mass per unit area can be reduced, thereby reducing the weight of the textile product and therefore the cost of the textile raw material.

[0020] It is also believed that adding the composition, or the composition together with polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof, to the fiber raw material in the board manufacturing process will impart grease and oil resistance to the board.

[0021] It has also been found that the addition of pigments and / or other additives to the composition prior to firing the composition onto the textile material improves the gloss, smoothness, coatability and / or barrier properties of the molded textile product. The appended claims define the scope of protection. [Brief explanation of the drawings]

[0022] [Figure 1] Olive oil resistance at 40°C of heat-pressed, dried two-dimensional fiber molded products of 500g / m2 or 400g / m2 is shown. The properties of several fiber molded products with different chemical properties of the fiber raw materials are shown. [Figure 2] The dry tensile properties of a 500g / m² heat-pressed, two-dimensional fiber molded product are shown. The properties of several fiber molded products with different chemical properties of the fiber raw materials are shown. [Figure 3]The high-moisture tensile properties of a 500g / m² heat-press dried two-dimensional fiber molded product are shown. The properties of several fiber molded products with different chemical properties of the fiber raw materials are shown. [Figure 4] Olive oil resistance at 40°C of a 400g / m2 hot-pressed, dried, two-dimensional fiber molded product is shown. The properties of several fiber molded products with different chemical properties of the fiber raw materials are shown. [Figure 5] The dry tensile properties of a 400 g / m² heat-pressed, two-dimensional fiber molded product are shown. The properties of several fiber molded products with different chemical properties of the fiber raw materials are shown. [Figure 6] Refers to vacuum-formed two-dimensional textile products or textile sheets. [Figure 7] It is a molded three-dimensional textile product. Detailed explanation

[0023] According to a first aspect, the present invention provides a method for improving the grease and oil resistance of a molded textile product, the method comprising: Obtaining a fiber raw material comprising cellulosic fibers; introducing a composition into said fiber material; wherein the composition comprises at least one anionic polymer having a molecular weight of at least 100 kDa; · with cationic polymers; wherein the anionic polymer has a molecular weight of at least 100 kDa and the cationic polymer imparts to the composition a charge density in the range of 0.1 to 1.5 meq / g when measured at pH 2.8, and when measured as an aqueous solution at pH 7.0, -3~-0.1 meq / g, preferably -2.5~-0.3 meq / g, more preferably -2.0~-0.5 providing the composition with a charge density in the range of meq / g; In some embodiments, the method includes introducing polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof, to the fiber material; shaping the fiber raw material; Includes.

[0024] The anionic polymer and the cationic polymer of the composition provide the composition with a charge density.

[0025] In some embodiments, polyamidoamine epichlorohydrin (PAAE), glyoxalated polyacrylamide, starch, or mixtures thereof are introduced into the fiber material. Preferably, polyamidoamine epichlorohydrin is introduced into the fiber material.

[0026] In some embodiments, a pigment is introduced into the fiber raw material. In some embodiments, the pigment is introduced into the fiber raw material before the composition is added to the fiber raw material. In some embodiments, the pigment is introduced into the fiber raw material after the composition is added to the fiber raw material. In some embodiments, the pigment is introduced into the fiber raw material simultaneously with the addition of the composition to the fiber raw material. In some embodiments, the pigment and the composition are introduced into the fiber raw material as a mixture.

[0027] In some embodiments, the pigment comprises talc, kaolin clay, calcium carbonate, or mixtures thereof.

[0028] The forming, i.e., forming step or process, can be any suitable method known in the art.

[0029] In some embodiments, forming includes wet forming, wet forming, vacuum forming, vacuum forming, extrusion forming, extrusion molding, thermoforming, dry forming, dry forming, heat pressing, heat press drying, thermoforming, heat pressing, thermoforming, thermoforming, or a combination thereof, preferably thermoforming, more preferably heat pressing, heat press drying, or thermoforming.

[0030] In some embodiments, the fiber material is formed into a sheet.

[0031] In some embodiments, the fibrous material is formed into a sheet, preferably thermoformed into a sheet.

[0032] The fibrous material can be thermoformed into a sheet by any suitable method known in the art, such as a heat press in which mechanical pressure and elevated temperature are applied between two metal plates that sandwich the fibrous material.

[0033] As used herein, the term "sheet" means an article having a thickness that is less than its length and width.

[0034] As used herein, the term "two-dimensional product" refers to a two-dimensional product that is originally made into a planar shape and has a thickness that is less than its length and width. Two-dimensional products can be folded, bent, formed, or molded into three-dimensional products.

[0035] As used herein, the terms "three-dimensional product" and "3D product" refer to a product having three dimensions. Sheets are not considered three-dimensional products for purposes of this application.

[0036] In some embodiments, the sheet is formed into a three-dimensional article.

[0037] In some embodiments, the fibrous material is formed into a three-dimensional article.

[0038] In some embodiments, the fiber raw material is formed into a two-dimensional sheet having a thickness of 0.1 mm to 10 mm, preferably 0.3 mm to 2 mm. In some embodiments, the 2D sheet is further thermoformed (i.e., dry formed) into a three-dimensional product, preferably having a length and width of 5 cm to 50 cm, a depth of 2 cm to 20 cm, and a wall thickness of 0.1 mm to 2 mm.

[0039] In some embodiments, the fibrous raw material, with or without foam, is vacuum formed or extruded, wet pressed and / or vacuum assisted draining, unconstrained and / or constrained drying, compressed in one or more directions, polymer impregnated, polymer laminated, polymer coated, or a combination thereof, into a two-dimensional sheet having a thickness of 0.1 mm to 10 mm, preferably 0.3 mm to 2 mm. In some embodiments, the 2D sheet is further thermoformed (i.e., dry formed) into a three-dimensional product, preferably having a length and width of 5 cm to 50 cm, a depth of 2 cm to 20 cm, and a wall thickness of 0.1 mm to 2 mm.

[0040] In some embodiments, the fibrous material is wet formed and the wet formed fibrous material is formed into a three-dimensional article.

[0041] In some embodiments, the fibrous raw material is vacuum formed or wet molded into a three-dimensional product, preferably having a length and width of 5 cm to 50 cm and a depth of 2 cm to 20 cm, and then thermoformed and dried to a wall thickness of preferably 0.1 mm to 3 mm, more preferably 0.3 mm to 1.0 mm.

[0042] In some embodiments, the temperature of the mold in the heat pressing, hot pressing, hot pressing drying, thermoforming or thermoforming is 100°C to 400°C, preferably 130°C to 200°C.

[0043] In some embodiments, the mechanical pressure applied to the fiber raw material or two-dimensional or three-dimensional fiber product during heat pressing, hot pressing, hot press drying, or thermoforming is between 0.1 bar and 1000 bar, preferably up to 20 bar, and may vary during heat pressing, hot pressing, hot press drying, or thermoforming depending on the manufacturing technique, equipment, and application of the fiber product.

[0044] In some embodiments, the forming is forming into a three-dimensional article, and is thermoforming, heat pressing, thermoforming, wet or dry forming, and / or wet or dry forming, densification, or combinations thereof.

[0045] In some embodiments, the polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof, and the composition are sequentially introduced to the fiber material. Preferably, the polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof are introduced to the fiber material before introducing the composition to the fiber material.

[0046] In some embodiments, the composition is introduced into a fiber material, after which polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof are introduced into the fiber material.

[0047] In some embodiments, at least one anionic polymer and a cationic polymer are sequentially introduced into the fiber material. Preferably, the at least one cationic polymer is introduced into the fiber material before the anionic polymer is introduced into the fiber material.

[0048] In some embodiments, the anionic polymer is introduced into the fiber material prior to the introduction of the at least one cationic polymer.

[0049] In some embodiments, the at least one anionic polymer, the cationic polymer, and polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof are introduced sequentially to the fiber material.

[0050] In some embodiments, the at least one anionic polymer and the cationic polymer are introduced sequentially into the fiber material, followed by the introduction of polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof into the fiber material.

[0051] In some embodiments, polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof is introduced to the fiber material, followed by sequentially introducing the at least one anionic polymer and the cationic polymer to the fiber material.

[0052] In some embodiments, the at least one anionic polymer is introduced to a fiber material, followed by introduction of polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof, to the fiber material, and then introduction of the cationic polymer to the fiber material.

[0053] In some embodiments, the cationic polymer is introduced to a fiber material, followed by the introduction of polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof, to the fiber material, and then the at least one anionic polymer is introduced to the fiber material.

[0054] The composition comprises a mixture of anionic and cationic polymers. The anionic and cationic polymers may be mixed together before adding the composition as an aqueous solution to the fiber raw material, i.e., before adding it as a single solution. The mixing may be performed by any suitable method for mixing the anionic and cationic polymers. For example, the anionic and cationic polymers may be mixed in dry form or as an aqueous solution. Alternatively, the dry anionic or cationic polymer may be dissolved in an aqueous solution containing the other component.

[0055] In some embodiments, the composition is in the form of an aqueous solution and is introduced to the fiber raw material as an aqueous mixture. The term "aqueous solution" as used herein encompasses true solutions as well as suspensions and emulsions. Preferably, the composition in the form of an aqueous solution contains only small amounts of undissolved residue or no undissolved residue or solids.

[0056] In some embodiments, the composition may be in the form of a dry particulate material. This reduces the risk of the composition deteriorating during transportation or storage, improving shelf life. In particular, cationic starch as a cationic polymer is susceptible to microbial degradation and would lose its performance if degraded. The composition may preferably be a mixture of a solid particulate anionic polymer and a solid particulate cationic polymer. Such a particulate mixture is easy to store and transport, and is economically advantageous. The moisture content of the composition in the form of a dry particulate material should be at most 25% by weight. The particle size of the dry particulate material may vary, for example, between 5 and 2000 microns.

[0057] If the composition is in the form of dry particulate matter, it can be dissolved in water to obtain an aqueous composition, which can be done using effective high-shear dissolving means, such as a rotor / stator mixer, or in some embodiments, by applying heat, or in some embodiments, by using a jet cooker. The dissolving can be done, for example, at the work site. According to a preferred embodiment, the composition in the form of dry particulate matter is dissolved in water, preferably using high-shear dissolving means, to obtain an aqueous composition. The resulting aqueous composition can then, in some embodiments, be diluted and then introduced into the fiber raw material.

[0058] In some embodiments, an amphoteric polymer having both anionic and cationic groups is incorporated into the fiber material, preferably in place of the composition. The amphoteric polymer provides a charge density of 0.1 to 1.5 meq / g when measured at pH 2.8. When measured at pH 7.0, -3~-0.1 meq / g, preferably -2.5~-0.3 meq / g, more preferably -2.0~-0.5 Gives the charge density in meq / g.

[0059] In some embodiments, an IPN (Interpenetrating Polymer Network) material having both anionic and cationic groups is incorporated into the fiber raw material, preferably in place of the composition. This IPN material provides a charge density of 0.1 to 1.5 meq / g when measured at pH 2.8 and 0.1 to 1.5 meq / g when measured at pH 7.0. -3~-0.1 meq / g, preferably -2.5~-0.3 meq / g, more preferably -2.0~-0.5 Gives the charge density in meq / g.

[0060] In some embodiments, a polymer having both anionic and cationic groups, preferably an amphoteric polymer and / or an interpenetrating polymer network material, is introduced into the fiber raw material, preferably in place of the composition, where the amphoteric polymer and / or the interpenetrating polymer network material provides the above-mentioned charge density.

[0061] In some embodiments, the composition is introduced in an amount of 5 to 50 kg / t, preferably 10 to 40 kg / t, more preferably 20 to 30 kg / t, based on the dry weight of the fiber raw material.

[0062] In some embodiments, the polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, or mixtures thereof are introduced in an amount of 1 kg / t to 8 kg / t, preferably 2 kg / t to 6 kg / t, and more preferably 2 kg / t to 4 kg / t dry weight, based on the dry weight of the fiber raw material.

[0063] In some embodiments, the starch comprises native starch, cooked starch, uncooked starch, cationic starch, natural chemically modified starch, physically modified polymer-grafted starch, enzyme-modified starch, anionic starch, amphoteric starch, crosslinked starch, pregelatinized starch, swelling starch, or granular starch, or mixtures thereof.

[0064] In some embodiments, the starch is introduced in an amount of from 1 kg / t to 100 kg / t dry weight, based on the dry weight of the fiber material.

[0065] In some embodiments, the cationic starch is introduced in an amount of from 1 kg / t to 20 kg / t dry weight, based on the dry weight of the fiber material.

[0066] In some embodiments, the non-ionic starch is introduced in an amount of from 1 kg / t to 100 kg / t dry weight, based on the dry weight of the fiber material.

[0067] In some embodiments, the pH of the fiber raw material is adjusted to a pH value of 5 to 9, preferably 7 to 8, before the composition and polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof are introduced into the fiber raw material.

[0068] In some embodiments, the conductivity of the textile material is adjusted to between 0.05 mS / cm and 6 mS / cm, preferably between 0.1 mS / cm and 1 mS / cm, prior to the addition of the composition and polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof to the textile material. In some embodiments, the conductivity is adjusted with a material consisting of 70% calcium acetate, 20% sodium sulfate, and 10% sodium bicarbonate.

[0069] In some embodiments, a sizing chemical, fixing agent, wet strength agent, drainage aid, or mixtures thereof is introduced to the fibrous material after or before the composition and polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof are introduced to the fibrous material.

[0070] In some embodiments, a sizing agent, fixing agent, wet strength agent, drainage aid, or mixtures thereof is introduced to the fibrous material prior to introducing the composition and polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof to the fibrous material.

[0071] In some embodiments, the composition and polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof are introduced to a textile material before a sizing agent, fixing agent, wet strength agent, drainage aid, or mixtures thereof is introduced to the textile material.

[0072] In some embodiments, polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof are introduced to the fibrous material prior to introducing the sizing agent to the fibrous material.

[0073] In some embodiments, the sizing agent and the polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof are simultaneously but separately introduced to the fibrous raw material.

[0074] In some embodiments, the sizing agent and polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, or mixtures thereof are introduced as a mixture to the fibrous material.

[0075] In some embodiments, the sizing agent comprises alkyl ketene dimer (AKD), alkenyl succinic anhydride (ASA), rosin, or a mixture thereof.

[0076] In some embodiments, the AKD, ASA, rosin, or mixtures thereof, and the polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof are introduced as a mixture to the fiber material, preferably before introducing the composition to the fiber material.

[0077] In some embodiments, the AKD, ASA, rosin, or mixtures thereof, and the polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof are introduced to the fiber material as a mixture, preferably after the composition is introduced to the fiber material.

[0078] In some embodiments, the AKD, ASA, rosin, polyamidoamine epichlorohydrin, glyoxalate polyacrylamide, starch, or mixtures thereof are introduced to the fiber material as a mixture, preferably before the composition is introduced to the fiber material.

[0079] In some embodiments, the AKD, ASA, rosin, polyamidoamine epichlorohydrin, glyoxalate polyacrylamide, starch, or mixtures thereof are introduced to the fiber material as a mixture, preferably after the composition is introduced to the fiber material.

[0080] In some embodiments, the AKD, ASA, rosin or mixtures thereof are incorporated in an amount of 0.1 to 4%, preferably 0.5 to 1.5%, based on the dry weight of the fiber material.

[0081] In some embodiments, the polyamidoamine epichlorohydrin, glyoxalated polyacrylamide or mixtures thereof are introduced in an amount of 1 to 8 kg / t dry weight, preferably 2 to 4 kg / t dry weight, based on the dry weight of the fiber raw material.

[0082] In some embodiments, the fixing agent, the drainage aid, or a mixture thereof comprises aluminum sulfate (ALS), polyaluminum chloride (PAC), poly(diallyldimethylammonium chloride) (PDACMAC), cationic polyacrylamide (CPAM), or a mixture thereof.

[0083] In some embodiments, the wet strength agent comprises polyamide epichlorohydrin (PAE), glyoxalated polyacrylamide (GPAM), starch, or mixtures thereof. In some embodiments, the wet strength agent is added after the addition of a sizing agent, but before adding the composition to a fibrous raw material.

[0084] In some embodiments, a fiber material comprising cellulosic fibers is obtained, the fiber material having a consistency of 0.1%-10%, preferably 0.2%-1.0%, more preferably 0.2%-0.5%.

[0085] In some embodiments, the cellulosic fiber-containing fiber raw material comprises natural fibers, synthetic fibers, or mixtures thereof, preferably of plant origin, including recycled, chemical and / or mechanical hardwood and softwood pulp, sugarcane (e.g., bagasse), bamboo, barley, wheat, corn, oat, rice, rye, tomato, sorghum, rapeseed, palm oil plants, flax, hemp, ramie, cotton, kenaf, jute, banana, hemp, peat, sphagnum moss, or mixtures thereof.

[0086] In some embodiments, the anionic polymer has a molecular weight of at least 100 kDa, preferably at least 300, more preferably from 100 kDa to 10,000 kDa, even more preferably from 100 kDa to 700 kDa, and even more preferably from 100 kDa to 600 kDa.

[0087] In some embodiments, the anionic polymer comprises carboxymethylcellulose, microfibrillated cellulose, microfibrillated lignocellulose, anionic starch, chitosan, pectin, fatty acid esters, other anionic and anionic derivatized polysaccharides, or mixtures thereof, preferably anionic starch, carboxymethylcellulose, microfibrillated cellulose, microfibrillated lignocellulose, or mixtures thereof.

[0088] In some embodiments, the cationic polymer comprises a starch derivative such as hydroxypropylated starch, nanocellulose, microfibrillated cellulose, lignocellulose-based derivatives, chitosan, alpha glucan, polyhydroxyalkanoates, polylactic acid, cationic starch, or a mixture thereof, preferably cationic starch, chitosan, nanocellulose, microfibrillated cellulose, lignocellulose-based derivatives, or a mixture thereof.

[0089] As is known, polysaccharides are natural polymers formed from high molecular weight carbohydrate molecules, which contain long chains of monosaccharide units as repeating units linked by covalent bonds. Polysaccharides can be extracted from various plant sources, microorganisms, etc. The polysaccharide chains contain multiple hydroxyl groups capable of hydrogen bonding.

[0090] As used herein, the term "anionically derivatized" refers not only to chemical modification of a polysaccharide by a reaction resulting in covalently bound anionic groups in the polysaccharide structure, but also to sufficient association of the anionic groups with the polysaccharide structure to impart desired properties, such as charge density, to the composition. Such sufficient association of the anionic groups can be achieved, for example, by adsorption. Alternatively, it can be achieved by other treatments of the polysaccharide starting material, such as mechanical treatment. Anionically derivatized polysaccharides can also be obtained by combining other treatments, such as mechanical processing, with chemical modification. Chemical modification of polysaccharides is preferred to provide anionically derivatized polysaccharides suitable for use in the present invention. Anionic groups may be provided, for example, by incorporating carboxyl groups, sulfate groups, sulfonate groups, phosphonate groups, phosphate groups (including their salt forms), or combinations thereof, into the polysaccharide structure. Anionic groups may be introduced into the polysaccharide structure by appropriate chemical modifications, such as carboxymethylation, oxidation, sulfation, sulfonation, or phosphorylation.

[0091] In some embodiments, anionically derivatized polysaccharides suitable for use in the present invention may have charge density values ​​in the range of -0.05 to 5.0 meq / g, measured at pH 7. For example, they may have charge density values ​​in the range of -0.3 to 5.0 meq / g or -0.5 to 5.0 meq / g, preferably -0.7 to 4.5 meq / g, and more preferably -1.0 to 4.0 meq / g. Measured charge density values ​​are calculated per dry weight.

[0092] The anionically derivatized polysaccharide may include a water-soluble and / or a suspendable anionically derivatized polysaccharide. As used herein, an aqueous solution of an anionically derivatized polysaccharide includes not only a true solution but also a suspension of an anionically derivatized polysaccharide. Preferably, the anionically derivatized polysaccharide is water-soluble and contains at most 30% by weight, preferably at most 20% by weight, more preferably at most 15% by weight, and even more preferably at most 10% by weight of water-insoluble material. Water solubility can improve the availability of functional groups on the polysaccharide, thereby improving its interaction with cationic polymers, such as cationic starch, and other components present in the fiber raw material of the composition.

[0093] In some embodiments, the anionically derivatized polysaccharide comprises an anionically derivatized cellulose, an anionically derivatized starch, or a combination thereof, including modified celluloses and starches such as hydroxyethyl cellulose, e.g., hydroxyethyl starch, ethyl hydroxyethyl cellulose, ethyl hydroxyethyl starch, hydroxypropyl cellulose, hydroxypropyl starch, hydroxypropyl hydroxyethyl cellulose, hydroxypropyl hydroxyethyl starch, methyl cellulose, methyl starch, and the like.

[0094] In some embodiments, the anionically derivatized polysaccharide comprises cellulose, preferably carboxymethylated cellulose, and more preferably carboxymethyl cellulose. The anionically derivatized polysaccharide may comprise, for example, purified carboxymethyl cellulose or technical-grade carboxymethyl cellulose. Carboxymethyl cellulose may be manufactured by any process known in the art. When the composition comprises an anionically derivatized polysaccharide comprising cellulose, the backbone structure of the polysaccharide is believed to be similar to that of cellulosic fibers in pulp, i.e., those exhibiting 1,4-β glycosidic linkages in the backbone. This similar structure may result in stronger interactions between the composition and the fibers.

[0095] In some embodiments, the anionically derivatized polysaccharide comprises carboxymethylated cellulose, preferably carboxymethyl cellulose. The cellulose has a degree of carboxymethyl substitution of 0.2 or more, preferably 0.3 to 1.2, more preferably 0.4 to 1.0 or 0.5 to 1.0, which further enhances water solubility. In some preferred embodiments, the carboxymethylated cellulose can have a degree of carboxymethyl substitution in the range of 0.5 to 0.9, thereby providing the carboxymethylated cellulose with essentially complete water solubility.

[0096] In some embodiments, the anionically derivatized polysaccharide comprises a carboxymethylated cellulose, preferably a carboxymethyl cellulose, which may have a charge density of less than -1.1 meq / g when measured at pH 7, and preferably -4.7~-1.6 meq / g, more preferably -4.1~-2.1 meq / g, more preferably -3.8~-2.5 It has a charge density of meq / g. All charge density values ​​measured are calculated per dry weight.

[0097] In some embodiments, the anionically derivatized polysaccharide comprises a carboxymethyl cellulose, preferably a carboxymethyl cellulose, which may have a viscosity in the range of 100 to 30,000 mPas, preferably 200 to 20,000 mPas, and more preferably 500 to 10,000 mPas, as measured from a 2 wt. % aqueous solution at 25° C. using a Brookfield LVDV1.

[0098] In some embodiments, the anionically derivatized polysaccharide comprises carboxymethylated cellulose, preferably carboxymethyl cellulose.

[0099] In some embodiments, the anionically derivatized polysaccharide is at least partially microfibrillar.

[0100] Preferably, the anion-derivatized polysaccharide comprises anionic microfibril cellulose. Microfibril cellulose is sometimes called nanocellulose; however, as used herein, microfibril cellulose or nanocellulose does not refer to crystalline cellulose derivatives, such as microcrystalline cellulose (MCC), nanocrystalline cellulose (NCC), or cellulose nanowhiskers. In other words, crystalline cellulose derivatives are excluded from anionic microfibril cellulose. Alternatively, the microfibrils may have an average diameter of 2 to 60 nm, preferably 4 to 50 nm, and more preferably 5 to 40 nm, and an average length of several micrometers, preferably 500 μm or less, more preferably 300 μm or less, more preferably 2 to 200 μm, even more preferably 10 to 100 μm, and most preferably 10 to 60 μm. Microfibrillated cellulose often contains bundles of 10 to 50 microfibrils.

[0101] In some embodiments, the anionically derivatized polysaccharide does not include microfibril cellulose.

[0102] In some embodiments, the composition comprises a naturally occurring cationic starch having an amylopectin content of at least 80% by weight. Amylopectin is a branched starch molecule. Branching typically occurs at α(1→6) linkages, with every 15 to 30 anhydroglucose units of the starch backbone containing α(1→4) linkages. The amylopectin content of the cationic starch ensures that the size of the polyion complexes formed has the appropriate dimensions required for good oil resistance.

[0103] In some embodiments, the cationic starch of the composition can have an amylopectin content of 85% by weight or more, preferably 90% by weight or more, and more preferably 95% by weight or more. The cationic starch of the composition can be derived from potato, waxy potato, rice, waxy corn, sweet potato, arrowroot, or tapioca starch, or any combination thereof. Preferably, the cationic starch is derived from waxy corn starch and / or waxy potato starch.

[0104] Cationic starch comprises starch units, i.e., starch molecules, of which at least 70% by weight, preferably at least 80% by weight, more preferably at least 85% by weight, even more preferably at least 90% by weight, and in some cases even more preferably at least 95% by weight, have an average molecular weight MW of more than 20,000,000 g / mol, preferably 50,000,000 g / mol or more, more preferably 100,000,000 g / mol or more, and in some cases 200,000,000 g / mol or more, such as from 200,000,000 g / mol to 500,000,000 g / mol.

[0105] In some embodiments, the composition comprises a cationic starch, the cationic starch comprising cationic unfloured starch. The cationic unfloured starch provides optimal interaction with the anionically derivatized polysaccharides and other components of the fiber raw material, such as fiber and / or inorganic fillers. As used herein, the term "unfloured starch" refers to starch that has not been essentially treated by oxidative, thermal, enzymatic, and / or acid treatments that cause hydrolysis of glycosidic bonds or degradation of starch molecules or units. When the starch is solubilized by cooking, the cooking temperature is below 140°C, preferably below 120°C, and often below 110°C or below 105°C.

[0106] For example, the unfloured cationic starch after solubilization has a viscosity that is at least 20%, preferably at least 50%, of the viscosity of the corresponding native starch solubilized by heating for 30 minutes at 97° C. Viscosity measurements are performed using a Brookfield LV-DVI viscometer at 2% solids and room temperature.

[0107] Cationic starch suitable for use in the composition can be obtained by cationizing starch by any suitable method. Preferably, cationic starch is obtained by using (3-chloro-2-hydroxypropyl)trimethylammonium chloride or (2,3-epoxypropyl)trimethylammonium chloride. Starch can also be cationized using a cationic acrylamide derivative such as (3-acrylamidopropyl)trimethylammonium chloride. Various methods for cationizing starch are known to those skilled in the art.

[0108] In some embodiments, the cationic starch is one that has been obtained using cationization as the only chemical derivatization of the starch, and thus the cationic starch is not crosslinked, not grafted, or otherwise chemically modified.

[0109] The cationic starch of the composition can have a degree of substitution of 0.025 to 0.3, preferably 0.03 to 0.16, and more preferably 0.045 to 0.1. The degree of substitution is relative to the degree of cationization of the starch, with a higher degree of substitution indicating a higher degree of cationization. Cationic starches with a relatively high degree of substitution and cationization may provide additional benefits and are therefore preferred for use in the composition.

[0110] In one preferred embodiment, the composition does not include a cationic synthetic polymer.

[0111] In some embodiments, the composition, cationic starch and / or anionically derivatized polysaccharide may further comprise adjuvants or additives such as preservatives, biocides, stabilizers, antioxidants, pH adjusters, and the like.

[0112] In some embodiments, the composition comprises an anionically derivatized polysaccharide and cationic starch in a (dry) weight ratio of 10:90 to 90:10, preferably 30:70 to 70:30. The weight ratios are given as dry weights. Preferably, the weight ratio of anionically derivatized polysaccharide to cationic starch is selected so that the composition is net anionic at the pH of the fiber source.

[0113] According to a second aspect, the present invention provides a molded fiber product comprising a composition comprising: at least one anionic polymer having a molecular weight of at least 100 kDa; · with cationic polymers; wherein the anionic polymer has a molecular weight of at least 100 kDa and the cationic polymer imparts to the composition a charge density in the range of 0.1 to 1.5 meq / g when measured at pH 2.8, and when measured as an aqueous solution at pH 7.0, -3~-0.1 meq / g, preferably -2.5~-0.3 meq / g, more preferably -2.0~-0.5 providing the composition with a charge density in the range of meq / g; In some embodiments, the composition comprises a polyamidoamine epichlorohydrin, a glyoxalated polyacrylamide, a starch, or a mixture thereof; In some embodiments, a pigment; wherein said shaped textile product is produced by a method according to the present invention.

[0114] In some embodiments, the molded fiber comprises polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof.

[0115] In some embodiments, the molded fiber comprises a pigment.

[0116] In some embodiments, the shaped textile is a thermoformed textile, preferably a heat pressed, heat press dried, heat pressed textile or a thermoformed textile.

[0117] In some embodiments, the amount of fiber in the shaped fiber product is 50 wt.%-99 wt.%, preferably 70 wt.%-97 wt.%, more preferably 90 wt.%-97 wt.%, based on the dry weight of the shaped fiber product.

[0118] In some embodiments, the amount of the composition in the molded fiber is from 0.5 wt.% to 10 wt.%, preferably from 1 wt.% to 3 wt.%, based on the dry weight of the molded fiber.

[0119] In some embodiments, the amount of polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof in the molded fiber is between 0.05 wt.% and 0.8 wt.%, preferably between 0.2 wt.% and 0.4 wt.%, based on the dry weight of the molded fiber.

[0120] In some embodiments, the amount of pigment in the molded fiber is from 0.01 wt.% to 5 wt.%, preferably from 0.5 wt.% to 4 wt.%, based on the dry weight of the molded fiber.

[0121] In some embodiments, the molded textile product comprises a sizing agent, fixing agent, wet strength agent, drainage aid, or mixtures thereof. In some embodiments, the amount of sizing agent, fixing agent, or mixtures thereof in the molded textile product is from 0.1 wt.% to 5 wt.%, preferably from 0.5 wt.% to 2.5 wt.%, based on the dry weight of the molded textile product.

[0122] In some embodiments, the shaped fiber product comprises a food package, a food service article, a beverage package, a beverage service article, a merchandise package, or a merchandise service article, preferably a food service or packaging article such as an ovenable tray, a microwaveable tray, a clamshell box, other food box, soup cup, raw meat or poultry tray, a plate, or a cup lid.

[0123] In some embodiments, the shaped fiber product is produced by the method of the present invention.

[0124] According to a third aspect, the present invention provides the use of a composition comprising: at least one anionic polymer having a molecular weight of at least 100 kDa; · with cationic polymers; The anionic and cationic polymers have a molecular weight of at least 100 kDa and a charge density in the range of 0.1 to 1.5 meq / g when measured at pH 2.8, and a charge density in the range of 0.1 to 1.5 meq / g when measured as an aqueous solution at pH 7.0. -3~-0.1 meq / g, preferably -2.5~-0.3 meq / g, more preferably -2.0~-0.5 imparting a charge density to the composition in the range of meq / g; In some embodiments, the composition comprises a polyamidoamine epichlorohydrin, a glyoxalated polyacrylamide, a starch, or a mixture thereof; Some embodiments include pigments to improve the grease and oil resistance of the molded fiber.

[0125] In some embodiments, the composition is used to improve grease resistance. In some embodiments, the composition is used to improve oil resistance. In some embodiments, the composition is used to improve oil and grease resistance.

[0126] In some embodiments, polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof are used in addition to the composition to improve the oil resistance of the thermoformed textile.

[0127] In some embodiments, in addition to the polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof and the composition, a pigment is used to improve the grease and oil resistance of the thermoformed textile.

[0128] In some embodiments, in addition to polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof, the composition, and the pigment, a sizing agent, fixing agent, or mixtures thereof is used to improve the grease and oil resistance of the thermoformed textile. [Example]

[0129] Example 1 according to the present invention

[0130] First, 0.1-0.3% (dry weight) AKD is added to a fiber raw material having a consistency of 0.3-0.5%. The fiber raw material is made from 100% birch kraft pulp. Next, 0.2-0.4% (dry weight) polyamide epichlorohydrin (PAE) is added to the fiber raw material. Next, 0.2-0.4% (dry weight) PDACMAC+CPAM is added to the fiber raw material. Next, 1-3% (dry weight) of a composition containing at least one anionic polymer having a molecular weight of at least 300-500 kDa, a cationic polymer, and, in some embodiments, PAAE is added to the fiber raw material. After each addition of each agent to the fiber raw material, the mixture is mixed under turbulent conditions for at least 1 minute before adding the next agent.

[0131] Example 2, Comparative Example

[0132] The same methods and chemicals as in Example 1 were used to prepare and characterize two-dimensional molded products / sheets, but this time PAAE and cationic starch were tested, alone and together. When combined, the PAAE was added first to the fiber stock, followed by the cationic starch. Compositions containing at least one anionic polymer with a molecular weight between 300 and 500 kDa, a cationic polymer, and PAAE were tested as in Example 1. PAAE was also tested with the anionic polymer in the composition by adding the PAAE first, followed by the anionic polymer, to the fiber stock.

[0133] Two-dimensional (2D) part / sheet preparation

[0134] After introducing the chemicals described in Examples 1 and 2 into the fiber raw material, the fiber raw material is vacuum-formed under a vacuum of 200-650 mBar against a forming wire with a 10 cm diameter flat circular shape and 200-400 micron openings, using a Dynamic Drainage Analyzer (DDA) to a dryness of 20-30%. The dry weight is 200-800 g / m. 2 The wet 2D molded product / sheet is hot-press dried between metal plates at 130-200°C until it reaches a dryness of 94-99%, and then thermoformed to a thickness of 0.2-1.2 mm. The hot-press dried and thermoformed 2D fiber molded product / sheet is shown in Figure 6.

[0135] 2D fiber molding: 0.5g / cm 3 ~1.5g / cm 3 , preferably 1.0 to 1.2 g / cm 3 The composition can be hot pressed and / or thermoformed to a density of 0.1 to 1.2 mm, preferably 0.3 to 0.8 mm, and a thickness of 0.1 to 1.2 mm, preferably 0.3 to 0.8 mm.

[0136] Three-dimensional (3D) part preparation

[0137] After the chemicals are introduced into the fiber material, a 3D forming wire with a suction mold is immersed in the fiber material. The fiber material is pulled through the 3D wire with 200-500 micron openings under a vacuum of up to 900 mBar, forming the shape. The formed 3D part is then lifted from the fiber material, and the liquid components are removed using vacuum suction assistance until the wet-formed 3D part has an average dryness of 33%. The wet-formed 3D part is then transferred to a heated countermold (130-200°C), hot-press dried, and thermoformed to a thickness of 0.2-1.2 mm and a final dryness of 90-96%. The dried 3D fiber part is shown in Figure 7.

[0138] The 3D molded product can be hot-press dried and thermoformed to a wall thickness of 0.2mm-1.2mm (e.g., 0.5mm-0.8mm), length of 5cm-50cm, width of 5cm-50cm, and depth of 2cm-20cm.

[0139] Oil and grease resistance test

[0140] The oil and fat tests were conducted using test methods based on the ASTM F119-82:2015 standard. The grease tests were conducted using test methods based on the TAPPI T559:2012 standard.

[0141] As can be seen from Figures 1 and 4, the thermoformed articles (2D molded articles / sheets) of the present invention exhibit improved oil resistance compared to the zero test (fiber raw materials only, including cellulosic fibers, no chemicals added) and the comparative thermoformed articles. As can be seen from Figures 2 and 5, the thermoformed articles (2D molded articles / sheets) of the present invention exhibit increased dry tensile properties. As can be seen from Figure 3, the thermoformed articles (2D molded articles / sheets) of the present invention exhibit increased humid tensile properties.

[0142] Various embodiments have been described. The terms "comprises", "has", "comprises" and "includes" are to be interpreted in an open-ended manner and do not exclude the presence of other elements.

[0143] The foregoing description provides a complete and informative description of the best mode for carrying out the invention currently contemplated by the inventors, using non-limiting examples of specific implementations and embodiments. However, as will be apparent to those skilled in the art, the details of the above-described embodiments do not limit the invention, and other embodiments may be implemented using equivalent means or combinations of various embodiments without departing from the characteristics of the invention.

[0144] Furthermore, features of the exemplary embodiments disclosed above may be employed without the corresponding use of other features. Accordingly, the foregoing description should be considered as merely illustrative of the principles of the present invention, and not in limitation thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. 1. A method for producing a molded fiber product, comprising: Obtaining a fiber raw material comprising cellulosic fibers; introducing a composition into the fiber material; wherein the composition comprises at least one anionic polymer having a molecular weight of at least 100 kDa; a cationic polymer; wherein the anionic polymer and the cationic polymer impart to the composition a charge density in the range of 0.1 to 1.5 meq / g when measured at pH 2.8, and a charge density in the range of -3 to -0.1 meq / g, preferably -2.5 to -0.3 meq / g, more preferably -2.0 to -0.5 meq / g when measured as an aqueous solution at pH 7.0; In some embodiments, the method includes introducing polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof, into the fiber material; shaping the fiber raw material; A method comprising:

2. 10. The method of claim 1, wherein polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof is introduced into the fiber material.

3. The method of claim 1 wherein a pigment is introduced into the fiber material.

4. The method of claim 1 wherein the fibrous material is formed into a sheet.

5. The method of claim 4 wherein the sheet is formed or molded into a three-dimensional article.

6. The method of claim 1 , wherein the fibrous material is formed into a three-dimensional article.

7. The method of claim 1 , wherein the fibrous material is wet-formed and the wet-formed fibrous material is formed into a three-dimensional article.

8. 10. The method of claim 1, wherein the forming comprises wet forming, wet molding, vacuum forming, vacuum forming, extrusion forming, extrusion molding, thermoforming, dry forming, heat pressing, heat press drying, hot molding, heat press forming, thermoforming, or a combination thereof.

9. 10. The method of claim 1, wherein polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof and the composition are introduced sequentially into the fiber raw material.

10. 10. The method of claim 1, wherein polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof is introduced to the fiber material prior to introducing the composition to the fiber material.

11. 10. The method of claim 1, wherein the composition is introduced into the fiber raw material, followed by introducing polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof into the fiber raw material.

12. 12. The method of claim 1, wherein the at least one anionic polymer and the cationic polymer are introduced sequentially into the fiber material.

13. 12. The method of claim 1, wherein the cationic polymer is introduced into the fiber material before introducing the anionic polymer.

14. 12. The method of claim 1, wherein the at least one anionic polymer is introduced into the fiber material followed by the cationic polymer.

15. 12. The method of claim 1, wherein the at least one anionic polymer, the cationic polymer, and polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof are sequentially introduced into the fiber raw material.

16. 12. The method according to any one of claims 1 to 11, wherein the at least one anionic polymer and the cationic polymer are sequentially introduced into the fiber raw material, followed by polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof being introduced into the fiber raw material.

17. 12. The method according to any one of claims 1 to 11, wherein polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch or a mixture thereof is introduced into the fiber raw material, followed by sequentially introducing the at least one anionic polymer and the cationic polymer into the fiber raw material.

18. 12. The method of any of claims 1 to 11, wherein the at least one anionic polymer is introduced into the fiber raw material, followed by polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof, and then the cationic polymer is introduced into the fiber raw material.

19. 12. The method according to any one of claims 1 to 11, wherein the cationic polymer is introduced into the fiber raw material, followed by polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch or a mixture thereof, and then the at least one anionic polymer is introduced into the fiber raw material.

20. 12. The method according to any one of claims 1 to 11, wherein the composition is introduced in an amount of 5 to 50 kg / t, preferably 10 to 40 kg / t, more preferably 20 to 30 kg / t, based on the dry weight of the fibre raw material.

21. 12. The method according to any one of claims 1 to 11, wherein polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch or mixtures thereof are introduced in an amount of 1 to 8 kg / t, preferably 2 to 6 kg / t, more preferably 2 to 4 kg / t, based on the dry weight of the fibre raw material.

22. 12. The method according to any one of claims 1 to 11, wherein the pH of the fibre raw material is adjusted to a pH value of 5 to 9, preferably 7 to 8, before the composition and polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch or mixtures thereof are introduced into the fibre raw material.

23. 12. The method according to any one of claims 1 to 11, wherein the conductivity of the fibrous material is adjusted to between 0.05 mS / cm and 6 mS / cm, preferably between 0.1 mS / cm and 1 mS / cm, before the composition and the polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch or mixtures thereof are introduced into the fibrous material.

24. 12. The method according to any one of claims 1 to 11, wherein a sizing agent, a fixing agent, a wet strength agent, a drainage aid or a mixture thereof is introduced into the textile raw material after or before the composition and polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch or a mixture thereof are introduced into the textile raw material.

25. 12. The method according to any one of claims 1 to 11, wherein a polymer having both anionic and cationic groups, preferably an amphoteric polymer and / or an interpenetrating polymer network material, is introduced into the fiber raw material, preferably instead of the composition, wherein the amphoteric polymer and / or the interpenetrating polymer network material provides the charge density.

26. 1. A molded fiber comprising a composition, the composition comprising: at least one anionic polymer having a molecular weight of at least 100 kDa; a cationic polymer; wherein the anionic polymer and the cationic polymer impart to the composition a charge density in the range of 0.1 to 1.5 meq / g when measured at pH 2.8, and a charge density in the range of -3 to -0.1 meq / g, preferably -2.5 to -0.3 meq / g, more preferably -2.0 to -0.5 meq / g when measured as an aqueous solution at pH 7.0; In some embodiments, the composition comprises: polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch or mixtures thereof, and / or pigments, Molded fiber products, including:

27. 27. The molded fiber product of claim 26, comprising food packaging, food service items, beverage packaging, merchandise packaging, preferably ovenable trays, microwaveable trays, clamshell boxes, other food boxes, soup cups, raw meat and poultry trays, plates or cup lids.

28. Use of a composition for improving the grease and oil resistance of a molded textile product, said composition comprising: at least one anionic polymer having a molecular weight of at least 100 kDa; a cationic polymer; wherein the anionic polymer and the cationic polymer impart to the composition a charge density in the range of 0.1 to 1.5 meq / g when measured at pH 2.8, and a charge density in the range of -3 to -0.1 meq / g, preferably -2.5 to -0.3 meq / g, more preferably -2.0 to -0.5 meq / g when measured in aqueous solution at pH 7.0; and In some embodiments, the composition comprises: polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch or mixtures thereof, and / or pigments, Including, use.

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