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 including a synthetic polymer component and a cationic polymer component into a textile raw material and thermoforming 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 rampant, 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 with plastics in both performance and cost.

[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-derived plastics, do not end up in the ocean. However, currently known fiber technologies are not suitable for use as closures for containers containing meat and poultry, cooked meals, prepared meals, microwaveable foods, or beverages such as hot coffee. In particular, selectively incorporating oil, water, steam, and / or oxygen barriers into slurries and / or selectively applying one or more barrier layers to all or a portion of the surface of a finished packaging product can be tedious, time-consuming, and costly.

[0006] Depending on the application of the molded pulp and the type of container, barrier properties against oil, grease, water, water vapor, oxygen, and / or other gases and liquids are required. 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 raw material comprising cellulosic fibers; introducing a composition into said fiber material; wherein the composition comprises a synthetic polymer component that is a copolymer of acrylamide and at least one anionic monomer, having 1-60 mol % anionic character; · cationic polymer components; The synthetic polymer component and the cationic polymer component have a pH of 0.05 to 1 meq / g when measured at pH 2.8, and a pH of 0.05 to 1 meq / g when measured at pH 7.0. -3~-0.2 providing the composition with a charge density of 1000 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: a synthetic polymer component that is a copolymer of acrylamide and at least one anionic monomer, having 1-60 mol % anionic character; · cationic polymer components; The synthetic polymer component and the cationic polymer component have a pH of 0.05 to 1 meq / g when measured at pH 2.8, and a pH of 0.05 to 1 meq / g when measured at pH 7.0. -3~-0.2 providing the composition with a charge density of 1000 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: a synthetic polymer component that is a copolymer of acrylamide and at least one anionic monomer, having 1-60 mol % anionic character; · cationic polymer components; The synthetic polymer component and the cationic polymer component have a pH of 0.05 to 1 meq / g when measured at pH 2.8, and a pH of 0.05 to 1 meq / g when measured at pH 7.0. -3~-0.2 meq / g charge density to the composition, and 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.

[0010] Surprisingly, it has now been found that molded textiles (e.g., thermoformed textiles) containing a composition comprising a synthetic polymer component and a cationic polymer component, such as a cationic starch component, having a particular charge density, 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 provide superior resistance to olive oil, i.e., improved penetration time and uptake compared to molded textiles not containing the composition, and is believed to also provide grease resistance.

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

[0013] It has been found that the incorporation of polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof in the above composition improves oil resistance of molded textiles (e.g., thermoformed textiles) by as much as 60 minutes compared to molded textiles without the use of the above composition and polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, or a mixture thereof. Grease resistance is also believed to be improved.

[0014] Without being bound by any theory, it is believed that molded textiles containing compositions including a synthetic polymer component and a cationic polymer component trap grease and oil components and act as grease and oil barriers.

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

[0016] It has also been surprisingly discovered that oil- and grease-resistant textiles can be produced in a simple, low-cost manner. It has been discovered that grease- and / or oil-resistant textiles can be produced by introducing a fiber raw material containing cellulosic fibers with a composition having a specific charge density, the composition comprising a synthetic polymer component and a cationic polymer component, and then shaping (e.g., thermoforming) the fiber raw 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. The 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 been surprisingly found that the above-described molded textiles (e.g., thermoformed textiles) have improved tensile bending stiffness, as compared to molded textiles that do not include the composition, or the composition and polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof. Improved tensile index and tensile bending stiffness may allow for a reduction in the thickness of the molded textile, and therefore a reduction in the mass per unit area of ​​the molded textile.

[0019] The weight of textile products could be reduced because the thickness and mass per unit area could be reduced, thus reducing the cost of textile raw materials.

[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] The olive oil resistance of a two-dimensionally molded fiber product (400 g / m²) at 40°C after heat-press drying and thermoforming (through the thickness) is shown for the case where the composition used in the method of the present invention (Composition B) was used, and for the case where Comparative Composition A was used. [Figure 2]Refers to a thermoformed two-dimensional textile product or textile sheet. [Figure 3] 1 shows a wet-formed and thermoformed 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 a synthetic polymer component that is a copolymer of acrylamide and at least one anionic monomer, having 1-60 mol % anionic character; · cationic polymer components; The synthetic polymer component and the cationic polymer component have a pH of 0.05 to 1 meq / g when measured at pH 2.8, and a pH of 0.05 to 1 meq / g when measured at pH 7.0. -3~-0.2 providing the composition with a charge density of 1000 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 synthetic polymer component and the cationic polymer component of the composition provide charge density to the composition.

[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 adding the composition to the fiber raw material.

[0027] In some embodiments, the pigment is introduced to the fiber raw material after the composition is added to the fiber raw material. In some embodiments, the pigment is introduced to the fiber raw material simultaneously with the composition being added to the fiber raw material.

[0028] In some embodiments, the pigment and the composition are introduced to the fiber material as a mixture.

[0029] In some embodiments, the pigment comprises talc, kaolin clay, calcium carbonate, or mixtures thereof.

[0030] The forming, i.e., forming step or process, can be any suitable method known in the art.

[0031] In some embodiments, forming includes wet forming, wet forming, vacuum forming, vacuum forming, extrusion, extrusion, thermoforming, dry forming, heat pressing, heat press drying, thermoforming, heat pressing, thermoforming, or a combination thereof, preferably thermoforming, more preferably heat pressing, heat press drying, or thermoforming.

[0032] In some embodiments, the fiber material is formed into a sheet.

[0033] In some embodiments, the fibrous material is formed into a sheet, preferably thermoformed into a sheet.

[0034] As used herein, the term "sheet" means an article having a thickness that is less than its length and width.

[0035] In this application, 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. A two-dimensional product can be folded or bent into a three-dimensional product.

[0036] As used herein, the terms "three-dimensional product" and "3D product" refer to a product that has three dimensions.

[0037] For purposes of this application, a sheet is not considered a three-dimensional product.

[0038] In some embodiments, the sheet is formed into a three-dimensional article.

[0039] In some embodiments, the fibrous material is formed into a three-dimensional article.

[0040] 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.

[0041] In some embodiments, the fibrous material is wet formed and the wet formed fibrous material is formed into a three-dimensional article.

[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 product, such as by thermoforming, heat pressing, thermoforming, wet or dry forming to densify and / or wet or dry forming, or a combination 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, the synthetic polymer component and the cationic polymer component are introduced sequentially into the fiber material. Preferably, the cationic polymer component is introduced into the fiber material before the synthetic polymer component is introduced into the fiber material.

[0048] In some embodiments, the synthetic polymer component is introduced into the fiber material prior to the cationic polymer component being introduced.

[0049] In some embodiments, the synthetic polymer component, the cationic polymer component, and the polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof are sequentially introduced to the fiber raw material.

[0050] In some embodiments, the synthetic polymer component and the cationic polymer component 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 mixtures thereof are introduced to the fiber material, followed by sequential introduction of the synthetic polymer component and the cationic polymer component to the fiber material.

[0052] In some embodiments, the synthetic polymer component 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 component to the fiber material.

[0053] In some embodiments, the cationic polymer component 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 synthetic polymer component is introduced to the fiber material.

[0054] In some embodiments, the composition contains both anionic groups, primarily derived from the synthetic polymer component, and cationic groups, primarily derived from the cationic polymer component (e.g., the cationic starch component). The net charge of the composition is carefully selected to provide optimal behavior during preparation, storage, and / or transportation of the composition, as well as across the various pH values ​​encountered during use.

[0055] In some embodiments, the synthetic polymer component and cationic polymer component (e.g., cationic starch component) of the present invention provide compositions having a charge density of 0.1 to 0.5 meq / g, preferably 0.15 to 0.3 meq / g, when measured at pH 2.8, and 0.15 to 0.3 meq / g, when measured at pH 7.0. -2.0~-0.4 meq / g, preferably -1.5~-0.5 According to one embodiment of the present invention, the composition has a charge density of - when measured at pH 7.0. 3.0~0.3 meq / g, preferably -3.0~-0.4 meq / g, more preferably - 3.0~-0.5The specified charge density at pH < 3.5 is adequate to provide easy handling of the composition, and the charge density at pH > 3.5 is sufficient to ensure the presence of anionic charges to provide effective interaction with both the cationic polymer component and the fiber and fillers in the raw materials.

[0056] In a preferred embodiment, the composition already has a net anionic charge at pH 5.5, preferably already has a net anionic charge at pH 5.0, more preferably already has a net anionic charge at pH 4.5.

[0057] When the pH value of the composition is <3.5, the charge density of the composition is primarily due to the cationic groups of the cationic polymer component, such as the cationic starch component. At pH values ​​>3.5, the charge density of the composition is primarily due to the anionic groups of the synthetic polymer component. The synthetic polymer component is at a pH of 7. -7~-0.3 meq / g, preferably -5~-0.5 meq / g, more preferably -3~-1 meq / g, more preferably -2~-1 It can have a charge density of 1 meq / g, i.e., it is anionic at pH 7.

[0058] In some embodiments, the composition may have a pH value below 3.5. The dry solids content of the composition during manufacture, transportation, and / or storage may range from 5 to 30% by weight, preferably from 10 to 20% by weight, and more preferably from 12 to 17% by weight. At acidic pH values ​​below 3.5, the anionic groups of the polymeric component are in their acid form. As the pH value decreases, the interaction between the anionic groups of the synthetic polymeric component and the cationic polymeric component decreases. For example, at pH values ​​below 3.2, the anionic groups of the synthetic polymeric component undergo little or no interaction with the charged cationic polymeric component. This results in a low viscosity, even at high solids, that facilitates composition preparation and handling. A high solids content of the composition is economical from the standpoint of storage and transportation, since less space is required for the same amount of active ingredient. The pH of the composition can be adjusted to a value below 3.5 by adding an acid.

[0059] In some embodiments, when the composition is ready to be added to a fiber stock, it may be diluted with water to have a final pH of 3.8 to 6.0, preferably 4 to 5.5. It may also have a dry solids content of less than 10% by weight, preferably less than 5% by weight, and more preferably less than 0.5 to 4.5% by weight after dilution. Typically, the composition may exhibit both cationic and anionic charges at the final pH, i.e., the pH at the time of addition. A defined charge density at pH > 3.5 is sufficient to provide effective interaction with both the cationic polymer component as well as the fiber and / or filler in the stock. Furthermore, it has been observed that compositions containing less than 10% by weight solids can be effectively mixed with the stock in the wet end of a paper or board machine. A solids content of less than 5% is particularly preferred when the starch component contains non-degraded starch.

[0060] In some embodiments, the composition comprises 10-90 wt. %, preferably 30-70 wt. %, more preferably 40-60 wt. % of a synthetic polymer component and 10-90 wt. %, preferably 30-70 wt. %, more preferably 40-60 wt. % of a cationic polymer component (e.g., a cationic starch component), calculated based on the dry weight of the composition. In a preferred embodiment, the ratio of synthetic polymer component to cationic polymer component (e.g., a cationic starch component) is 40:60 to 60:40 by dry weight. The ratio of synthetic polymer component to cationic polymer component is selected so that the composition is net anionic at the pH of the fiber raw material.

[0061] The synthetic polymer component of the composition may be a copolymer of acrylamide and at least one anionic monomer. The copolymer may be linear or crosslinked. The synthetic polymer may be prepared by any suitable polymerization method, such as solution polymerization, dispersion polymerization, emulsion polymerization, gel polymerization, or bead polymerization. In some embodiments, the synthetic polymer component of the composition is prepared by polymerization of acrylamide and at least one anionic monomer. The anionic monomer is selected from unsaturated monocarboxylic or dicarboxylic acids or salts thereof, such as acrylic acid, methacrylic acid, maleic acid, itaconic acid, crotonic acid, isocrotonic acid, or mixtures thereof. The synthetic polymer component is preferably prepared by solution polymerization of acrylamide and acrylic acid.

[0062] When the synthetic polymer component is crosslinked, a crosslinking agent is used in the polymerization in an amount of 100 to 1000 mg / kg, preferably 100 to 500 mg / kg. Suitable crosslinking agents include, for example, methylenebisacrylamide, ethylene glycol divinyl ether, di(ethylene glycol) divinyl ether, and tri(ethylene glycol) divinyl ether. However, methylenebisacrylamide is preferred.

[0063] In some embodiments, the synthetic polymer components are not crosslinked at all or only lightly crosslinked. In such embodiments, a crosslinker is used in the polymerization in an amount of 0.25 to 100 mg / kg of monomer, preferably 0.5 to 10 mg / kg, and more preferably 0.75 to 5 mg / kg.

[0064] The synthetic polymer component may have an anionicity of 3 to 40 mol%, preferably 5 to 18 mol%, and more preferably 9 to 15 mol%. Anionicity refers to the amount of structural units derived from anionic monomers in the synthetic polymer component. The anionicity of the synthetic polymer component is selected to optimize binding between the composition and fibers, fillers, and other components in the raw material. If the amount of units derived from anionic monomers is too low, the composition will not exhibit the desired net anionic charge and will not achieve the desired binding effect. On the other hand, if the amount of units derived from anionic monomers is too high, too little dosage will be required to induce the desired effect.

[0065] In some embodiments, the synthetic polymer component of the present invention, preferably prepared by solution polymerization, may have a weight average molecular weight (MW) of 300,000 g / mol or greater, preferably 500,000 g / mol or greater. Preferably, the weight average molecular weight of the synthetic polymer component may be 300,000-1,000,000 g / mol, more preferably 400,000-1,000,000 g / mol, and even more preferably 500,000-900,000 g / mol. The average molecular weight of the synthetic polymer component is carefully selected to provide optimal performance in the composition. It has been observed that if the average molecular weight is too high, the viscosity of the composition will be too high at a useful solids content, while the solids content will be too low to achieve the appropriate viscosity.

[0066] In some embodiments, the synthetic polymer component is obtained by first adiabatic gel polymerization, followed by drying, followed by bead polymerization in a solvent or emulsion or dispersion polymerization in an aqueous salt medium, and has an average molecular weight MW in the range of 2,000,000-18,000,000 g / mol, preferably 4,000,000-10,000,000 g / mol.

[0067] In this application, the term "average molecular weight" is used to represent the magnitude of polymer chain length and indicates the weight-average molecular weight of a polymer. The average molecular weight value is calculated from the intrinsic viscosity measured by a known method using an Ubbelohde capillary viscometer in 1N NaCl at 25°C. The capillary is selected appropriately; in this measurement, an Ubbelohde capillary viscometer with a constant K = 0.005228 was used. The average molecular weight is then calculated from the intrinsic viscosity using a known method using the Mark-Houwink equation [η] = K - Ma. Here, [η] is the intrinsic viscosity, M is the molecular weight (g / mol), and K and a are parameters described for polyacrylamide in the following literature: Polymer Handbook, Fourth Edition, Volume 2, Editors: J. Brandrup, EH Immergut and EA Grulke, John Wiley & Sons, Inc., USA, 1999, p.VII / 11.

[0068] Therefore, the value of the parameter K is 0.0191 ml / g and the value of the parameter a is 0.71. The range of average molecular weight given in the parameters of the conditions of use is 490,000-3,200,000 g / mol, but the same parameters are used to describe molecular weight magnitudes outside this range. For polymers with low average molecular weights, typically less than about 1,000,000 g / mol, the average molecular weight is measured using Brookfield viscosity measurement at a temperature of 23°C and a polymer concentration of 10%. The molecular weight [g / mol] is calculated using the formula 1,000,000 * 0.77 * ln(viscosity [mPas]). In practice, for polymers where the Brookfield viscosity can be measured and the calculated value is less than 1,000,000 g / mol, this means that the calculated value is the acceptable MW value. If the Brookfield viscosity cannot be measured or if the calculated value is greater than 1,000,000 g / mol, the intrinsic viscosity is used to determine the MW value, as described above.

[0069] In addition to the synthetic polymer component, the composition includes a cationic polymer component, such as a naturally occurring cationic starch component. In some embodiments, the cationic starch component is cationic virgin starch. As used herein, this refers to starch modified solely by cationization, which is non-degraded and non-crosslinked. In some embodiments, the cationic starch component includes starch units, 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, of which have an average molecular weight (MW) greater than 20,000,000 g / mol, preferably 50,000,000 g / mol or greater, more preferably 100,000,000 g / mol or greater, and in some cases 200,000,000 g / mol or greater. When the cationic starch component is not degraded, the length of the starch molecules provides a good three-dimensional network effect, leading to suitable interactions not only with the synthetic polymer component but also with other components of the fiber raw material, such as fibers and / or inorganic fillers, and cationic strength agents added separately to the fiber raw material.

[0070] The cationic starch component may be starch from potato, waxy potato, rice, corn, waxy corn, wheat, barley, sweet potato, or tapioca. Preferably, the cationic starch component is waxy corn starch and / or waxy potato starch. According to certain preferred embodiments, the cationic starch component has an amylopectin content of 70% or more, preferably 80% or more, more preferably 85% or more, even more preferably 90% or more, and sometimes even more preferably 95% or more.

[0071] The cationic starch component is in the form of an aqueous solution, which means that the starch has been dissolved in water, for example by cooking. Cooking may be carried out at a temperature of 60 to 135°C.

[0072] Starch can be cationized by any suitable method. Preferably, starch is cationized using 2,3-epoxypropyltrimethylammonium chloride or 3-chloro-2-hydroxypropyl-trimethylammonium chloride, with 2,3-epoxypropyltrimethylammonium chloride being preferred. Starch can also be cationized using cationic acrylamide derivatives such as (3-acrylamidopropyl)trimethylammonium chloride.

[0073] The cationic starch component may have a degree of substitution of 0.025 to 0.3, preferably 0.03 to 0.16, more preferably 0.045 to 0.1. The degree of substitution is relative to the degree of cationization of the starch. Cationic starches with relatively high cationicity as defined are preferred for use in the composition.

[0074] In one preferred embodiment, the composition does not include a cationic synthetic polymer.

[0075] The composition is a mixture of a synthetic polymer component and a cationic polymer component, such as a cationic starch component. The components of the composition may be thoroughly mixed before adding the composition to the fiber raw material. That is, the composition is added to the raw material as a single solution. In this specification, the mixture of a synthetic polymer component and a cationic polymer component is understood as a blend or combination of an existing synthetic polymer component and a starch component. Both components are in the form of a solution or colloid when mixed. In other words, the mixture should not be interpreted as covering a composition obtained by polymerizing a synthetic polymer monomer in the presence of a cationic polymer component, thereby forming a starch graft.

[0076] In some embodiments, the composition can be prepared by mixing a cationic polymer component, such as a cationic starch component, with a solution of the synthetic polymer component (preferably at a pH < 3.5). If the pH during mixing is higher than 4.5, there is a risk of gel formation, especially if the solids content of the composition exceeds 12% by weight.

[0077] The synthetic polymer component may be in the form of an aqueous solution or suspension when mixed with the starch component.

[0078] In some embodiments, a solution of a cationic polymer component, such as a cationic starch component, and a solution of a polymer component may be mixed prior to addition to the feedstock, provided that the solids concentration of each of the two solutions is less than 12% by weight, preferably less than 10% by weight. Preferably, the cationic polymer component and the synthetic polymer component are allowed to interact with each other prior to adding the composition to the fiber feedstock to ensure the formation of a polyionic complex.

[0079] In some embodiments, the compositions of the present invention may be prepared on-site. That is, the synthetic polymer component and the cationic polymer component may be transported dry or separately to the site of use. At the site of use, the synthetic polymer component and the cationic polymer component are optionally dissolved and / or diluted and mixed to form an aqueous composition. This reduces the risk of the composition deteriorating during transportation or storage. In particular, the cationic starch component is susceptible to microbial degradation, which would result in a loss of performance.

[0080] When the composition is prepared or stored as a stock solution with a high solids content (e.g., greater than 10 wt%), the pH value is less than 3.5, preferably less than 3. It has been observed that a low pH improves mixing of the synthetic anionic and cationic polymer components, providing a homogeneous composition with the desired viscosity. In certain preferred embodiments, the composition has a Brookfield viscosity of less than 10,000 mPas, preferably less than 8,000 mPas, and more preferably less than 6,000 mPas, at a pH of 3.0 and a solids content of 14 wt%. In some embodiments, the viscosity of the composition is in the range of 2,000 to 10,000 mPas, preferably 2,500 to 6,500 mPas, at a pH of 3.0 and a solids content of 14 wt%. Viscosity values ​​were measured at room temperature using a Brookfield DV-I+, small sample adapter, 20 spindle 31, and maximum rotation speed. The viscosity of the composition at a pH below 3.5 and high solids content is suitable for proper handling of the composition in industrial processes, for example, allowing for dilution by pumping and mixing the composition.

[0081] Generally, the composition has an anionic net charge from a pH value of about 3.8 or higher. Polyionic complexes resulting from the interaction between the cationic polymer component and the synthetic polymer component can be formed to a significant extent even at a pH of about 3.2. When a composition with a pH below 3.5 and a high solids content (e.g., greater than 10% by weight) is diluted with water, the pH of the composition changes simultaneously with the addition of water. Alternatively, the pH of the composition can be adjusted by adding a base. Typically, the composition is diluted with water before being added to the fiber material, and the pH is adjusted by dilution or the addition of a base. This results in a composition solution with a pH of 3, preferably at least 3.5, and more preferably 3.5 to 4.0. When the pH of the composition exceeds pH 5, the net charge of the composition becomes anionic. At pH 7, the net charge of the composition is always anionic.

[0082] In some embodiments, an amphoteric polymer having both anionic and cationic groups is incorporated into the fiber material, preferably in place of the composition, and provides a charge density of 0.05 to 1.5 meq / g when measured at pH 2.8 and 0.05 to 1.5 meq / g when measured at pH 7.0. -3~-0.2 Gives the charge density in meq / g.

[0083] In some embodiments, an IPN (Interpenetrating Polymer Network) material is incorporated into the fiber raw material, preferably in place of the composition, which provides a charge density of 0.05 to 1.5 meq / g when measured at pH 2.8 and 0.05 to 1.5 meq / g when measured at pH 7.0. -3~-0.2 Gives the charge density in meq / g.

[0084] 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.

[0085] In some embodiments, the composition is introduced in an amount of 5 to 50 kg / t, preferably 10 to 35 kg / t, more preferably 15 to 30 kg / t, based on the dry weight of the fiber raw material.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] In some embodiments, the cationic starch is introduced in an amount of 4 kg / t to 20 kg / t dry weight, based on the dry weight of the fiber material.

[0090] 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.

[0091] 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.

[0092] In some embodiments, the conductivity of the textile material is adjusted to between 0.1 mS / cm and 3 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] In some embodiments, the sizing agent, polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof are simultaneously but separately introduced into the fibrous raw material.

[0098] In some embodiments, the sizing agent, polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, or mixtures thereof are introduced as a mixture to the fibrous material.

[0099] In some embodiments, the sizing agent comprises alkyl ketene dimer (AKD), alkenyl succinic anhydride (ASA), rosin, or a mixture thereof.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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%.

[0109] 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.

[0110] In some embodiments, the cationic polymer component comprises a starch derivative such as hydroxypropylated starch, nanocellulose, microfibrillated cellulose, lignocellulose-based derivatives, chitosan, alpha glucan, polyhydroxyalkanoates, polylactic acid, cationic starch, or mixtures thereof, preferably cationic starch, chitosan, nanocellulose, microfibrillated cellulose, lignocellulose-based derivatives, or mixtures thereof.

[0111] According to a second aspect, the present invention provides a molded fiber product comprising a composition comprising: a synthetic polymer component that is a copolymer of acrylamide and at least one anionic monomer, having 1-60 mol % anionic character; · cationic polymer components; The synthetic polymer component and the cationic polymer component have a pH of 0.05 to 1 meq / g when measured at pH 2.8, and a pH of 0.05 to 1 meq / g when measured at pH 7.0. -3~-0.2 providing the composition with a charge density of 1000 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; Includes.

[0112] In some embodiments, the molded fiber comprises polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof.

[0113] In some embodiments, the molded fiber comprises a pigment.

[0114] In some embodiments, the shaped textile is a thermoformed textile, preferably a heat pressed, heat press dried, heat pressed textile or a thermoformed textile.

[0115] In some embodiments, the amount of fiber in the shaped fiber product is 50 wt.%-99 wt.%, preferably 80 wt.%-97 wt.%, more preferably 90 wt.%-97 wt.%, based on the dry weight of the shaped fiber product.

[0116] In some embodiments, the amount of the composition in the molded fiber is from 0.5 wt.% to 10 wt.%, preferably from 1.5 wt.% to 3 wt.%, based on the dry weight of the molded fiber.

[0117] 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.

[0118] 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.

[0119] In some embodiments, the shaped fiber product includes a sizing agent, a fixing agent, or a mixture thereof.

[0120] In some embodiments, the molded textile product comprises a sizing agent, fixing agent, drainage aid, or mixtures thereof. In some embodiments, the amount of sizing agent, fixing agent, drainage aid, 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.

[0121] 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.

[0122] In some embodiments, the shaped fiber product is produced by the method of the present invention.

[0123] According to a third aspect, the present invention provides the use of a composition comprising: a synthetic polymer component that is a copolymer of acrylamide and at least one anionic monomer, having 1-60 mol % anionic character; · cationic polymer components; The synthetic polymer component and the cationic polymer component have a pH of 0.05 to 1 meq / g when measured at pH 2.8, and a pH of 0.05 to 1 meq / g when measured at pH 7.0. -3~-0.2 meq / g charge density to the composition, and In some embodiments, the composition comprises polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof; Some embodiments include pigments to improve the grease and oil resistance of the molded fiber.

[0124] In some embodiments, polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof are used in addition to the composition to improve the grease and oil resistance of the thermoformed textile.

[0125] 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.

[0126] In some embodiments, in addition to polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or mixtures thereof, the composition, and the pigment, sizing agents, wet strength agents, fixing agents, drainage aids, or mixtures thereof are used to improve the grease and oil resistance of the thermoformed textile. [Example]

[0127] Example 1 according to the present invention

[0128] First, 0.1-0.3% (dry weight) AKD is added to a fiber raw material with a consistency of 0.3-0.5%. This fiber raw material is made from 100% birch kraft pulp. Next, 0.3-0.5% (dry weight) polyamide epichlorohydrin (PAAE) is added to the fiber raw material. Next, 1-3% (dry weight) of a composition (Composition B) containing at least one synthetic anionic polymer with a molecular weight of 300-900 kDa and a cationic polymer 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 and forming a vacuum.

[0129] Example 2, Comparative Example

[0130] The same methods and chemicals as in Example 1 were used to prepare and characterize two-dimensional molded products / sheets, but instead of composition B, comparative composition A was used. Comparative composition A is a mixture of anionic and cationic polymers with molecular weights of 300-700 kDa.

[0131] Two-dimensional (2D) part / sheet preparation

[0132] After the chemicals described in Examples 1 and 2 are introduced into the fiber material, the fiber material is vacuum-formed under a vacuum of 200-500 mBar against a 10 cm diameter, flat circular forming wire with 200-400 micron openings to a dryness of 20-30% as measured by a Dynamic Drainage Analyzer (DDA). The wet 2D molded product / sheet with a dry weight of 200-800 g / m2 is then hot-press dried between metal plates at 130-200 °C until a dryness of 94-99% is reached, and then thermoformed to a thickness of 0.2-0.8 mm. The hot-press-dried and thermoformed 2D fiber molded product / sheet is shown in Figure 2.

[0133] The two-dimensional fiber molded product can be hot pressed and / or thermoformed to a density of 0.5 g / cm 3 to 1.5 g / cm 3 , preferably 1.0 to 1.2 g / cm 3 , and a thickness of 0.1 to 1.2 mm, preferably 0.2 to 0.8 mm.

[0134] Three-dimensional (3D) part preparation

[0135] 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 200-400 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 94-96%. The dried 3D fiber part is shown in Figure 3.

[0136] The 3D molded product can be hot-press dried and thermoformed to a wall thickness of 0.1 mm-1.2 mm (e.g., 0.5 mm-0.8 mm), length of 5 cm-50 cm, width of 5 cm-50 cm, and depth of 2 cm-20 cm.

[0137] Oil and grease resistance test

[0138] 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.

[0139] As can be seen from Figure 1, the wet-formed and (through thickness) thermoformed molded part (2D molded part / sheet) according to the invention (Composition B) shows improved oil resistance compared to the zero test (only fiber raw materials including cellulosic fibers, no chemicals added) and the comparative composition A.

[0140] 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.

[0141] 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 a synthetic polymer component that is a copolymer of acrylamide and at least one anionic monomer, having 1-60 mol % anionic character; a cationic polymer component; and wherein the synthetic polymer component and the cationic polymer component provide the composition with a charge density of 0.05 to 1 meq / g when measured at pH 2.8 and -3 to -0.2 meq / g when measured 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 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. 9. The method according to claim 1, wherein polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch or a mixture thereof and the composition are introduced sequentially into the fiber raw material.

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

11. 9. The method of any one of claims 1 to 8, 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. The method of any of claims 1 to 8, wherein the synthetic polymer component and the cationic polymer component are introduced sequentially into the fiber material.

13. 9. The method of claim 1, wherein the cationic polymer component is introduced into the fiber material before introducing the synthetic polymer component.

14. 9. The method of claim 1, wherein the synthetic polymer component is introduced into the fiber material before introducing the cationic polymer component.

15. 9. The method of claim 1, wherein the synthetic polymer component, the cationic polymer, and polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof are sequentially introduced into the fiber raw material.

16. 9. The method of claim 1, wherein the synthetic polymer component and the cationic polymer component are sequentially introduced into the fiber raw material, followed by polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof.

17. 9. The method according to claim 1, wherein polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof is introduced into the fiber raw material, followed by sequentially introducing the synthetic polymer component and the cationic polymer into the fiber raw material.

18. 9. The method of any of claims 1 to 8, wherein the synthetic polymer component is introduced to the fiber raw material, followed by polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof, and then the cationic polymer component is introduced to the fiber raw material.

19. 9. The method of any of claims 1 to 8, wherein the cationic polymer component is introduced into the fiber raw material, followed by polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof, and then the synthetic polymer component is introduced into the fiber raw material.

20. 9. The method according to any one of claims 1 to 8, wherein the composition is introduced in an amount of 5 to 50 kg / t, preferably 15 to 35 kg / t, more preferably 20 to 30 kg / t, based on the dry weight of the fibre raw material.

21. 9. The method according to any one of claims 1 to 8, 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. 9. The method according to claim 1, wherein 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.

23. 9. The method according to claim 1, 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. 9. The method according to any one of claims 1 to 8, wherein a sizing agent, a fixing agent, or a mixture thereof is introduced into the fiber raw material before the composition and polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch, or a mixture thereof are introduced into the fiber raw material.

25. 9. The method of claim 1, wherein an amphoteric polymer and / or an interpenetrating polymer network material having both anionic and cationic groups 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: a synthetic polymer component that is a copolymer of acrylamide and at least one anionic monomer, having 1-60 mol % anionic character; a cationic polymer component; and the synthetic polymer component and the cationic polymer component impart to the composition a charge density of 0.05 to 1 meq / g when measured at pH 2.8 and -3 to -0.2 meq / g when measured at pH 7.0; In some embodiments, the composition comprises: polyamidoamine epichlorohydrin, glyoxalated polyacrylamide, starch or mixtures thereof, and / or pigments, Including, Molded fiber products.

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 to improve the grease and oil resistance of a molded textile product, said composition comprising: a synthetic polymer component that is a copolymer of acrylamide and at least one anionic monomer, having 1-60 mol % anionic character; a cationic polymer component; and wherein the synthetic polymer component and the cationic polymer component provide the composition with a charge density of 0.05 to 1 meq / g when measured at pH 2.8 and -3 to -0.2 meq / g when measured 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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