Aqueous composition

Abstract

To provide an aqueous composition excellent in oil resistance, gas permeability, storage stability, and press stability.SOLUTION: An aqueous composition includes an emulsion or a dispersion (A) including a biomass-derived material, a water-dispersible resin and / or a water-soluble resin (B) having an acid value of 30 to 230, and water (C).SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an aqueous composition. [Background technology]

[0002] Due to changes in the environment surrounding containers and packaging, the movement to eliminate plastic (for example, replacing the use of plastic with coated paper) is accelerating. Fluorine-based oil-resistant coatings have traditionally been used to impart oil resistance to media such as paper, but environmental and health considerations mean that replacement with non-fluorine-based coatings is required.

[0003] Patent Document 1 discloses an aqueous emulsion oil-resistant coating agent containing component (a) which is hydrogenated castor oil and / or rice wax, component (b) which is polyvinyl alcohol and / or casein, and water.

[0004] This oil-resistant coating agent has high breathability and oil resistance. In addition, because it is mainly made from hydrogenated castor oil and / or rice wax, which are biologically derived components, it is highly carbon neutral and has a low environmental impact. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7311848 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the water-based emulsion oil-resistant coating agent of Patent Document 1 lacks oil resistance.

[0007] The problem to be solved by the present invention is to provide an aqueous composition that is excellent in oil resistance, breathability, storage stability, and on-machine stability. [Means for solving the problem]

[0008] The present invention encompasses the embodiments described below. Section 1. An aqueous composition comprising: (A) an emulsion or dispersion containing a biomass-derived material; (B) a water-dispersible resin and / or a water-soluble resin having an acid value of 30 to 230; and (C) water. Section 2. Item 2. The aqueous composition according to Item 1, wherein the biomass-derived material comprises an alcohol fatty acid ester. Section 3. Item 2. The aqueous composition according to Item 1, wherein the emulsion or dispersion (A) containing a biomass-derived material contains a powder containing hydrogenated castor oil. Section 4. Item 2. The aqueous composition according to Item 1, wherein the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230 comprises a water-dispersible / water-soluble polyester resin. Section 5. Item 2. The aqueous composition according to Item 1, wherein the solids mass ratio ((A) / (B)) of the emulsion or dispersion (A) containing a biomass-derived material to the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230 is 90 / 10 to 50 / 50. Section 6. Item 1. The aqueous composition according to Item 1, further comprising an aqueous dispersion (D) of a polyolefin or paraffin. Section 7. 7. The aqueous composition according to claim 6, wherein the aqueous dispersion of polyolefin or paraffin (D) comprises an aqueous dispersion containing a polyolefin resin. Section 8. 7. The aqueous composition according to claim 6, wherein the aqueous dispersion of polyolefin or paraffin (D) comprises an aqueous dispersion containing a polyolefin wax. Section 9. 7. The aqueous composition according to claim 6, wherein the aqueous dispersion (D) of polyolefin or paraffin comprises an aqueous dispersion containing a polyethylene resin and a paraffin wax. Section 10. 10. The aqueous composition according to claim 1, further comprising a barrier property improver. Section 11. 11. A method for producing an oil-resistant substrate, comprising applying the aqueous composition according to claim 1 to a substrate. Section 12. The method of claim 11 , wherein the substrate comprises paper. Section 13. 11. A substrate coated with the aqueous composition according to claim 1. Section 14. A coating agent comprising the aqueous composition according to any one of claims 1 to 10. Section 15. 11. An oil-resistant coating agent comprising the aqueous composition according to claim 1. Section 16. 11. A coating agent for paper, plastic or fiber, comprising the aqueous composition according to claim 1. [Effects of the Invention]

[0009] The aqueous composition of the present invention contains the combination of (A) and (B) above, and therefore satisfies oil resistance, breathability, storage stability, and on-machine stability. DETAILED DESCRIPTION OF THE INVENTION

[0010] In this specification, the term "comprise" is a concept that encompasses "consist essentially only of" and "consist only of."

[0011] In this specification, "biomass" refers to organic resources derived from living organisms, excluding fossil resources.

[0012] As used herein, the term "biomass-derived material" refers to a material derived from biomass, including, for example, a composition or compound made from biomass. As used herein, the terms "hardened castor oil" and "hydrogenated castor oil" may be used interchangeably.

[0013] Hereinafter, embodiments for carrying out the present invention will be described. Note that the embodiment described below shows an example of a typical embodiment of the present invention, and the scope of the present invention should not be construed as being narrow.

[0014] aqueous composition The aqueous composition according to an embodiment of the present invention contains an emulsion or dispersion (A) containing a biomass-derived material, a water-dispersible resin and / or a water-soluble resin (B) having an acid value of 30 to 230, and water (C).

[0015] The emulsion or dispersion (A) containing a biomass-derived material is used to provide oil resistance to an aqueous composition. The "emulsion or dispersion containing a biomass-derived material" (A) can itself be an oil-resistant coating agent with a low environmental impact. In one embodiment, the emulsion or dispersion (A) containing a biomass-derived material does not contain a fluorine compound. This reduces the environmental impact. In one embodiment, the emulsion or dispersion (A) containing a biomass-derived material is a dispersion in which a powder containing a biomass-derived material is dispersed in a solvent. In another embodiment, the emulsion or dispersion (A) containing a biomass-derived material is an aqueous dispersion in which a powder containing a biomass-derived material is dispersed in an aqueous solvent.

[0016] The biomass-derived material preferably contains an alcohol fatty acid ester (A1), which is an ester of an alcohol and a fatty acid or a fatty acid salt. One or more types of alcohol fatty acid esters can be used. Examples of alcohols include glycerol. Examples of fatty acids include saturated or unsaturated fatty acids with 16 or more carbon atoms, such as palmitic acid, stearic acid, oleic acid, and linoleic acid. Examples of fatty acid salts include potassium salts, sodium salts, and calcium salts. Examples of fatty acid salts include, but are not limited to, sodium oleate, sodium stearate, sodium palmitate, calcium oleate, calcium stearate, and calcium palmitate. Examples of alcohol fatty acid esters include fatty acid glycerides. Biomass-derived materials also include oils and fats, which are esters of naturally occurring fatty acids and glycerin. Examples of oils and fats include corn oil, rice bran oil, palm oil, coconut oil, castor oil (especially hydrogenated castor oil), and rice wax. In particular, from the viewpoint of oil resistance, the alcohol fatty acid ester (A1), which is an ester of the alcohol with a fatty acid or a fatty acid salt, preferably contains hydrogenated castor oil and / or rice wax, and more preferably contains hydrogenated castor oil.

[0017] The emulsion or dispersion (A) containing a biomass-derived material may further contain polyvinyl alcohol and / or casein (A2).

[0018] When the emulsion or dispersion (A) containing a biomass-derived material contains polyvinyl alcohol and / or casein (A2), the ratio of the alcohol fatty acid ester (A1) to the polyvinyl alcohol and / or casein (A2) is preferably a mass ratio of alcohol fatty acid ester (A1) / polyvinyl alcohol and / or casein (A2) of 100 / 1 to 100 / 20, in terms of emulsion stability.

[0019] The emulsion or dispersion (A) containing a biomass-derived material may further contain water (A3). Note that this water (A3) is the water in the emulsion or dispersion (A) and is not included in the water (C). In a preferred embodiment, the emulsion or dispersion (A) containing a biomass-derived material is an oil-in-water emulsion.

[0020] The biomass-derived material and the emulsion or dispersion (A) containing the biomass-derived material may be commercially available products or may be produced by known methods.

[0021] Examples of biomass-derived materials include hydrogenated castor oil A (manufactured by Ito Oil Mills, Ltd., hydrogenated castor oil), ASA T-20SF (manufactured by Ito Oil Mills, Ltd., hydrogenated castor oil powder), Castorwax A Flakes (manufactured by NOF Corporation, hydrogenated castor oil powder), Castorwax AF Powder (manufactured by NOF Corporation, hydrogenated castor oil powder), NATUREFINE H325 (manufactured by Micro Powders Inc., hydrogenated castor oil powder), LANDY PL-3000 (manufactured by Miyoshi Oil & Fats Co., Ltd., polylactic acid dispersion), NATUREFINE R331 (manufactured by Micro Powders Inc., rice wax powder), and DK Ester F-140 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd., sucrose fatty acid ester powder). The use of hydrogenated castor oil powder as a biomass-derived material can eliminate or suppress yellowing of coating films formed from aqueous compositions. As a commercially available emulsion containing the above biomass-derived material, for example, "SEIKOAT T-EF201" (manufactured by Seiko PMC Co., Ltd.) can be used.

[0022] The solids content of the emulsion or dispersion (A) containing a biomass-derived material is preferably 10% by mass or more and 55% by mass or less, more preferably 15% by mass or more and 50% by mass or less. From the viewpoint of suppressing thickening over time of the emulsion or dispersion (A) containing a biomass-derived material, a solids content of 55% by mass or less is preferred. From the viewpoint of containing the active ingredient in the emulsion or dispersion (A) containing a biomass-derived material, a solids content of 10% by mass or more is preferred. In this specification, the solids content refers to the percentage of the remaining mass of the emulsion or dispersion (A) containing a biomass-derived material after heating and drying at 150°C for 20 minutes relative to the mass before heating.

[0023] The water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230 is used to improve the emulsification and dispersion stability of the emulsion or dispersion (A) containing a biomass-derived material, as well as the storage stability and on-press stability of the aqueous composition. Adding an aqueous dispersion (D) of polyolefin or paraffin to the emulsion or dispersion (A) containing a biomass-derived material improves the oil resistance of the aqueous composition, but may decrease the storage stability and on-press stability. However, adding a water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230 can impart excellent storage stability and on-press stability to the aqueous composition. When the acid value of the water-dispersible resin and / or water-soluble resin is less than 30, the storage stability and on-press stability of the aqueous composition are inferior to those of a water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230.

[0024] The water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230 may be produced by a known method, or a commercially available product may be used.

[0025] In terms of the storage stability, on-machine stability, and oil resistance of the aqueous composition, the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230 preferably contains a polyester resin, an acrylic resin, a styrene-acrylic resin, or any combination thereof. In particular, the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230 preferably contains a polyester resin. In some embodiments, the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230 contains a polyester resin and a styrene-acrylic resin. The glass transition temperature Tg of the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230 is preferably 0°C to 120°C, and more preferably 35°C to 120°C.

[0026] In one embodiment, the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230 excludes a copolymer having a glass transition temperature of 30°C or lower, which is obtained by copolymerizing a carboxylic acid having an unsaturated double bond with a (meth)acrylate.

[0027] In this specification, the acid value refers to the number of milligrams of potassium hydroxide required to neutralize the acidic components contained in 1 g of resin.

[0028] The solids mass ratio ((A) / (B)) of the emulsion or dispersion (A) containing a biomass-derived material to the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230 is preferably 90 / 10 to 50 / 50, more preferably 90 / 10 to 60 / 40, more preferably 87.5 / 12.5 to 62.5 / 37.5, and even more preferably 80 / 20 to 65 / 35.

[0029] The water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230 includes a polyester resin and / or an acrylic resin, and preferably has an acid value of 30 to 100.

[0030] The amount of water (C) is preferably 100 to 30,000 parts by mass, more preferably 150 to 1,900 parts by mass, and even more preferably 230 to 900 parts by mass, relative to 100 parts by mass of the total solid content of the emulsion or dispersion (A) containing a biomass-derived material, the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230, and the optional aqueous dispersion (D) of polyolefin or paraffin described below. The amount of water (C) is preferably 50 to 99.9 mass %, more preferably 60 to 95 mass %, and even more preferably 70 to 90 mass %, based on the total mass of the aqueous composition.

[0031] The aqueous composition according to an embodiment of the present invention may further contain an aqueous dispersion (D) of polyolefin or paraffin. The aqueous dispersion (D) of polyolefin or paraffin is used to improve oil resistance. The aqueous dispersion (D) of polyolefin or paraffin contains a polyolefin, a paraffin (also referred to as paraffin wax or hydrocarbon wax), or both. Examples of polyolefins used in the aqueous dispersion (D) of polyolefin or paraffin include polyolefin resins such as polyethylene resin, polypropylene resin, and ethylene-vinyl acetate (EVA) copolymer; and polyolefin waxes such as polyethylene wax and polypropylene wax. The inclusion of a polyolefin resin in the aqueous dispersion (D) of polyolefin or paraffin improves oil resistance due to improved film-forming properties compared to wax. The polyolefin resin may be a polyolefin resin produced by a known method or a commercially available polyolefin resin.

[0032] In a preferred embodiment, the aqueous dispersion of polyolefin or paraffin (D) is an aqueous dispersion containing a polyolefin resin. In another preferred embodiment, the aqueous dispersion of polyolefin or paraffin (D) is an aqueous dispersion containing a polyolefin wax. In yet another preferred embodiment, the aqueous dispersion of polyolefin or paraffin (D) is an aqueous dispersion containing a polyethylene resin and a paraffin wax. The aqueous dispersion of polyolefin or paraffin (D) may contain waxes other than paraffin. Examples of such waxes include, but are not limited to, water-dispersible polyethylene wax, carnauba wax, beeswax, candelilla, lanolin, soybean oil, rapeseed oil, ceresin, palm oil, coconut oil, montan, microcrystalline wax, Fischer-Tropsch wax, stearic acids, fatty acid amides, and fatty acid esters. These waxes may be used singly or in combination.

[0033] The wax used in the aqueous dispersion (D) of polyolefin or paraffin may be the same type of wax as or a different type of wax from the wax used in the emulsion or dispersion (A) containing the biomass-derived material, but is preferably a different type of wax.

[0034] In one embodiment, the aqueous dispersion of polyolefin or paraffin (D) does not contain any wax that is a biomass-derived material. In one embodiment, the aqueous dispersion of polyolefin or paraffin (D) does not contain carnauba wax.

[0035] The amount of the aqueous dispersion (D) of polyolefin or paraffin in the aqueous composition is preferably 0.1 to 100 parts by mass, more preferably 0.1 to 50 parts by mass, in terms of solid content, per 100 parts by mass of the total solid content of the emulsion or dispersion (A) containing a biomass-derived material and the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230.

[0036] The aqueous composition according to the present invention may further contain a defoaming agent. Examples of the defoaming agent include silica, silicone-based defoaming agents, acetylene alcohol or glycol-based defoaming agents, acrylic resin-based defoaming agents, and vinyl resin-based defoaming agents. These may be used alone or in combination.

[0037] When the aqueous composition contains an antifoaming agent, the amount of the antifoaming agent is preferably 0.01 to 5 parts by mass, and more preferably 0.1 to 3 parts by mass, in terms of solid content, per 100 parts by mass of the total solid content of the emulsion or dispersion (A) containing a biomass-derived material and the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230.

[0038] The aqueous composition according to the present embodiment may further contain a surface conditioner. Examples of the surface conditioner include vinyl surface conditioners, silicone surface conditioners, and acrylic resin surface conditioners.

[0039] When the aqueous composition contains a surface conditioner, the amount of the surface conditioner in the aqueous composition is preferably 0.01 to 10 parts by mass, and more preferably 0.1 to 10 parts by mass, in terms of solid content, per 100 parts by mass of the total solid content of the emulsion or dispersion (A) containing a biomass-derived material and the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230.

[0040] The aqueous composition according to an embodiment of the present invention may further contain a crosslinking agent. The crosslinking agent imparts barrier properties to the aqueous composition. Examples of crosslinking agents that can be used include those that form ionic bonds with the emulsion or dispersion (A) containing the biomass-derived material or the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230, and those that react with reactive groups in the component (A) or component (B) to form a crosslinked structure. Examples of crosslinking agents include zinc oxide, carbodiimide group-containing compounds, isocyanate group-containing compounds, epoxy group-containing compounds, and oxazoline group-containing compounds. These agents can be used alone or in combination.

[0041] The amount of crosslinking agent in the aqueous composition according to an embodiment of the present invention is preferably 0 to 3 parts by mass in terms of solid content per 100 parts by mass of the total solid content of the emulsion or dispersion (A) containing a biomass-derived material and the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230.

[0042] The aqueous composition according to the present invention may further contain an impregnation accelerator for the aqueous composition. Examples of the impregnation accelerator include acrylic emulsions, silicone compounds or their emulsions, and acetylene-based emulsifiers. These may be used alone or in combination.

[0043] The amount of the impregnation accelerator in the aqueous composition according to an embodiment of the present invention is preferably 0 to 10 parts by mass in terms of solid content relative to 100 parts by mass of the total solid content of the emulsion or dispersion (A) containing a biomass-derived material and the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230.

[0044] The aqueous composition according to an embodiment of the present invention may further contain a barrier property improver. The barrier property improver improves the barrier property of the aqueous composition by imparting viscosity to the aqueous composition. Examples of barrier property improvers include polyvinyl alcohol, starch (corn starch, potato starch, tapioca starch, wheat starch, glutinous rice starch, etc.), starch derivatives, dextrin, cellulose, carboxymethylcellulose (CMC), cellulose nanofiber (CNF), tamarind gum, tamarind seed gum, xanthan gum, guar gum, locust bean gum, konjac mannan, soybean polysaccharides, carrageenan, agar, alginic acid, chitosan, and the like. These may be used alone or in combination of two or more.

[0045] The amount of the barrier property improver in the aqueous composition according to an embodiment of the present invention is preferably 0 to 50 parts by mass, for example 0 to 20 parts by mass, in terms of solid content, relative to 100 parts by mass of the total solid content of the emulsion or dispersion (A) containing a biomass-derived material and the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230. When the aqueous composition contains a barrier property improver, the amount of the barrier property improver in the aqueous composition is preferably 3 to 50 parts by mass, and more preferably 2 to 20 parts by mass, in terms of solid content, relative to 100 parts by mass of the total solid content of the emulsion or dispersion (A) containing a biomass-derived material and the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230.

[0046] The aqueous composition of the present invention may further contain various additives that are commonly used in paints, such as fillers, lubricants, water absorbents, antiblocking agents, silane coupling agents, viscosity modifiers, surfactants, dispersants, preservatives, leveling agents, dyes, antioxidants, and ultraviolet absorbers.

[0047] Examples of fillers that can be used include inorganic fillers such as talc, kaolin, calcined kaolin, clay, heavy calcium carbonate, light calcium carbonate, white carbon, zeolite, magnesium carbonate, barium carbonate, titanium dioxide, zinc oxide, silicon oxide, amorphous silica, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, barium sulfate, calcium sulfate bentonite, smectite, and saponite stevensite, as well as known fillers such as urea-formalin resin, polystyrene resin, phenolic resin, hollow microparticles, and (meth)acrylic acid ester polymer particles. These can be used alone or in combination of two or more.

[0048] Examples of lubricants include ester-based lubricants, hydrocarbon-based lubricants, fatty acid-based lubricants, aliphatic amide-based lubricants, and metal soap-based lubricants.

[0049] Examples of the water absorbing agent include polymer water absorbing agents.

[0050] Examples of the sizing agent include rosin-based sizing agents, alkyl ketene dimers (AKD), and alkenyl succinic anhydrides (ASA).

[0051] Examples of paper strength agents include polyacrylamide (PAM) and polyamide epichlorohydrin.

[0052] The aqueous composition according to the embodiment of the present invention described above contains an emulsion or dispersion (A) containing a biomass-derived material and a water-dispersible resin and / or a water-soluble resin (B) having an acid value of 30 to 230, and therefore has excellent oil resistance and high breathability, making it suitable as a paper coating agent. Furthermore, the aqueous composition according to the embodiment of the present invention also has excellent storage stability and on-machine stability. A film formed by the aqueous composition according to the embodiment of the present invention does not crack when folded, is usable for food, and is disintegratable.

[0053] The present invention also encompasses a coating agent comprising the aqueous composition of an embodiment of the present invention, an oil-resistant coating agent comprising the aqueous composition of an embodiment of the present invention, and a coating agent for paper, plastic, or fiber comprising the aqueous composition of an embodiment of the present invention. More preferably, these coating agents do not contain a fluorine compound.

[0054] Method for producing aqueous composition Next, a method for producing the aqueous composition according to an embodiment of the present invention will be described.

[0055] The emulsion or dispersion (A) containing a biomass-derived material may be a commercially available emulsion or dispersion containing a biomass-derived material, or may be produced by applying a known method for producing an emulsion or dispersion.

[0056] When producing an emulsion containing a biomass-derived material, known methods can be used, such as a method in which an alcohol fatty acid ester (A1) is added to an aqueous solution of polyvinyl alcohol and / or casein (A2) and the mixture is stirred at high temperature; a solvent method in which the alcohol fatty acid ester (A1) is dissolved in a solvent, polyvinyl alcohol and / or casein (A2) and water (A3) are added, and the mixture is emulsified under high pressure, and the solvent is then distilled off; a phase inversion emulsification method in which an aqueous solution of polyvinyl alcohol and / or casein (A2) is added dropwise to molten alcohol fatty acid ester (A1) to convert the mixture from a droplet-in-oil type to an oil-in-water type; a high-pressure emulsification method in which the mixture is mixed under high temperature and pressure, followed by high-pressure emulsification; and an ultrasonic emulsification method. Of these, it is preferable to form an emulsion by a high-pressure emulsification method. When producing a dispersion containing a biomass-derived material, for example, the dispersion can be formed by mixing a powder of a biomass-derived material (e.g., hydrogenated castor oil) with an aqueous solvent such as water or alcohol, and then dispersing the powder of the biomass-derived material in the water or aqueous solvent by stirring.

[0057] Next, the emulsion or dispersion (A) containing a biomass-derived material and the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230 are mixed to obtain an aqueous composition.

[0058] To a mixture of an emulsion or dispersion (A) containing a biomass-derived material and a water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230, water (C) can be added, and, if necessary, an aqueous dispersion (D) of polyolefin or paraffin, an antifoaming agent, a surface conditioner, a surfactant, a crosslinking agent, an impregnation accelerator, a barrier property improver, and other additives can also be added. The timing of adding one or more of these components is not limited, and they may be added simultaneously when the emulsion or dispersion (A) containing a biomass-derived material and the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230 are mixed, or they may be added additionally to a mixture of the emulsion or dispersion (A) containing a biomass-derived material and the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230.

[0059] Method for manufacturing a substrate imparted with oil resistance The aqueous composition according to the above-described embodiment of the present invention can be used to impart oil resistance to a substrate.

[0060] A method for producing an oil-resistant substrate according to an embodiment of the present invention includes applying the aqueous composition to a substrate.

[0061] Examples of the substrate include paper, resin (natural resin, synthetic plastic), rubber, metal, and any combination of these, but it is preferable to include paper in order to provide oil resistance and breathability.

[0062] Paper means paper and / or paperboard, and examples thereof include fine paper, pure white roll paper, unbleached or bleached kraft paper, glassine paper, coated paper, liner base paper, paper tube base paper, white cardboard, chipboard, and the like.

[0063] The aqueous composition of the present invention can be applied to paper by any known coating method without limitation. Examples of such methods include bar coating, blade coating, die coating, curtain coating, air knife coating, spray coating, gravure coating, flexo coating, and size press coating. Of these, size press coating is preferred from the viewpoint of oil resistance and breathability. The aqueous composition of the present invention can be applied to both single-layer and multi-layer coating, and can be applied to either single- or double-sided coating. Of these, double-sided coating is preferred from the viewpoint of oil resistance and breathability, and double-sided coating by size press coating is preferred. The coating amount of the aqueous composition of the present invention is not particularly limited, but is preferably 1 to 10 g / m from the viewpoint of oil resistance and cost. 2 It is preferable that:

[0064] A coating layer for controlling liquid absorption or a coating layer for filling in irregularities on the paper surface to make it smooth may be provided between the paper and the coating layer containing the aqueous composition of an embodiment of the present invention.

[0065] To dry the coating film of the aqueous composition according to the embodiment of the present invention, any known drying method can be used without limitation, including, for example, cylinder heating, steam heating, hot air heating, infrared heating, and high-frequency heating.

[0066] The aqueous composition according to an embodiment of the present invention is useful for a variety of applications, including additives for foods, cosmetics, pharmaceuticals, etc., as well as antifogging agents, antistatic agents, compatibilizers, paints, coating agents, agents for imparting oil resistance to paper, adhesives, dispersants for various organic and inorganic particles, and additives for thermoplastic and thermosetting resins.

[0067] The aqueous composition of the present invention is suitable for use as a coating agent for various substrates. In particular, it is suitable as a coating agent for packaging materials such as food packaging materials. The aqueous composition of the present invention is also suitable as an oil-resistant coating agent for various substrates. For example, a paper product can be produced having a coating layer formed by applying or impregnating one or both surfaces of a paper substrate with the aqueous composition of the present invention. The types of substrates are as described above.

[0068] Furthermore, the aqueous composition of the present invention can be mixed with pulp slurry and then used for papermaking to produce a paper product.

[0069] Furthermore, a laminate may be formed having a coating layer formed by applying the aqueous composition of the embodiment of the present invention to one or both surfaces of a paper, plastic substrate, or wood substrate.

[0070] The disclosures of all patent applications and publications cited herein are hereby incorporated by reference in their entirety. [Example]

[0071] The following examples are intended for illustrative purposes only and are not intended to limit the scope of the present invention in any way. Unless otherwise specified, reagents are commercially available or are obtained or prepared according to conventional techniques or literature procedures in the art.

[0072] 1. Polyester resin production Manufacturing Example 1 A stainless steel autoclave equipped with a stirrer, thermometer, and partial reflux condenser was charged with 48.9 parts by mass of dimethyl 2,6-naphthalenedicarboxylate, 119.6 parts by mass of isophthalic acid, 12.4 parts by mass of ethylene glycol, 72.1 parts by mass of 1,3-butanediol, and 0.02 parts by mass of tetra-n-butyl titanate, and the temperature was raised from 160°C to 220°C over 4 hours to promote transesterification and polymerization while removing the low-boiling methanol produced over the course of the reaction. The temperature was then raised to 255°C, and the reaction system was gradually reduced in pressure. The reaction was then continued for 1 hour and 30 minutes under a reduced pressure of 30 Pa to obtain a copolymerized polyester resin with a number average molecular weight of 2900.

[0073] Next, 243.3 parts by mass of the copolymerized polyester resin and 28.8 parts by mass of trimellitic anhydride were placed in a reactor equipped with a stirrer, thermometer, and reflux device, and an addition reaction was carried out at 170 ° C for 30 minutes. 24.3 parts by mass of ethylene glycol-t-butyl ether was added, and the mixture was heated to 110 ° C and stirred to dissolve the resin. After the resin was completely dissolved, 26.7 parts by mass of dimethylaminoethanol and 678.6 parts by mass of water were gradually added to the polyester solution while stirring. After the addition, the liquid was cooled to room temperature while stirring to obtain a polyester water dispersion (B-1) with a solids content of 25% by mass.

[0074] Manufacturing Example 2 A stainless steel autoclave equipped with a stirrer, thermometer, and partial reflux condenser was charged with 48.9 parts by weight of dimethyl 2,6-naphthalenedicarboxylate, 119.6 parts by weight of isophthalic acid, 12.4 parts by weight of ethylene glycol, 36.1 parts by weight of 1,3-butanediol, 47.3 parts by weight of 1,6-hexanediol, and 0.02 parts by weight of tetra-n-butyl titanate. The temperature was raised from 160°C to 220°C over 4 hours, during which transesterification and polymerization were carried out while removing the low-boiling methanol produced over the course of the reaction. The temperature was then raised to 255°C, and the reaction system was gradually reduced in pressure. The reaction was then carried out under a reduced pressure of 30 Pa for 1 hour and 30 minutes, yielding a copolymerized polyester resin with a number average molecular weight of 3100.

[0075] Next, 248.7 parts by mass of the copolymerized polyester resin and 23.1 parts by mass of trimellitic anhydride were placed in a reactor equipped with a stirrer, thermometer, and reflux device, and an addition reaction was carried out at 170 ° C for 30 minutes. 24.9 parts by mass of ethylene glycol-t-butyl ether was added, and the mixture was heated to 110 ° C and stirred to dissolve the resin. After the resin was completely dissolved, 21.4 parts by mass of dimethylaminoethanol and 700.0 parts by mass of water were gradually added to the polyester solution while stirring. After the addition, the liquid was cooled to room temperature while stirring to obtain a polyester water dispersion (B-2) with a solids content of 25% by mass.

[0076] Manufacturing Example 3 A stainless steel autoclave equipped with a stirrer, thermometer, and partial reflux condenser was charged with 48.9 parts by weight of dimethyl 2,6-naphthalenedicarboxylate, 116.3 parts by weight of isophthalic acid, 23.7 parts by weight of dimethyl-5-sodium sulfoisophthalate, 17.4 parts by weight of ethylene glycol, 59.1 parts by weight of 1,6-hexanediol, 2.12 parts by weight of diethylene glycol, and 0.02 parts by weight of tetra-n-butyl titanate. The temperature was raised from 160°C to 220°C over 4 hours, during which transesterification and polymerization were carried out while removing the low-boiling methanol produced over the course of the reaction. The temperature was then raised to 255°C, and the reaction system was gradually reduced in pressure. The reaction was then carried out under a reduced pressure of 30 Pa for 1 hour and 30 minutes, yielding a copolymerized polyester resin with a number average molecular weight of 19,000.

[0077] Next, 245.5 parts by mass of copolymerized polyester resin and 24.5 parts by mass of ethylene glycol-t-butyl ether were placed in a reactor equipped with a stirrer, thermometer, and reflux device, and the mixture was heated to 110°C and stirred to dissolve the resin. After the resin was completely dissolved, 711.9 parts by mass of water was gradually added to the polyester solution while stirring. After the addition, the liquid was cooled to room temperature while stirring to obtain a polyester water dispersion (B-3) with a solids content of 25% by mass.

[0078] 1. Preparation of aqueous composition Example 1 As the emulsion or dispersion (A) containing a biomass-derived material, 250 parts by mass (solids content 75 parts by mass) of SEICOAT T-EF201 (a biomass-derived non-fluorinated oil-resistant coating agent, manufactured by Seiko PMC Corporation, solids content 30% by mass) and 100 parts by mass (solids content 25 parts by mass) of the polyester water dispersion (B-1) obtained in Production Example 1 as the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230 mg KOH / g were dispersed, mixed, and stirred using a stirrer.

[0079] Next, 62.5 parts by mass (25 parts by mass of solids) of AQUACER 2500 (a nonionic emulsion of modified polyethylene wax, BYK, solids content 40% by mass), 1 part by mass (1 part by mass of active ingredient) of Surfynol 420 (a nonionic surfactant having an acetylene group, Nissin Chemical Industry Co., Ltd., active ingredient 100%), 5 parts by mass (0.75 parts by mass of solids) of Zinc Oxide Solution No. 1 (a zinc oxide crosslinker, BASF, solids content 15% by mass), 100 parts by mass (5 parts by mass of solids) of Poval JC-25 (a polyvinyl alcohol aqueous solution, fully saponified poval, Nippon Vinyl Acetate & Poval Co., Ltd., solids content 5% by mass), and 140 parts by mass of deionized water were added, dissolved, and mixed to obtain an aqueous composition. The solids content of the aqueous composition was 20% by mass.

[0080] Next, the aqueous composition was applied to the paper at 4±2 g / m using a two-roll size press. 2 The paper was unbleached kraft paper with a basis weight of 20 to 90 g / m. 2 is.

[0081] Examples 2 to 27, Comparative Examples 1 to 4 An aqueous composition was obtained in the same manner as in Example 1, except that the types and amounts of the emulsion or dispersion (A) containing a biomass-derived material, the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230, and other additives were changed to those shown in Table 2. In Table 2, the numbers in parentheses for each component indicate the solid content.

[0082] Furthermore, in the same manner as in Example 1, each aqueous composition was applied to paper to obtain the desired greaseproof paper.

[0083] The reagents used in the examples and comparative examples are shown below.

[0084] (1) Emulsion or dispersion containing biomass-derived material (A) (A-1) SEIKOAT (registered trademark) T-EF201 Biomass-derived non-fluorinated oil-resistant coating agent, Seiko PMC Corporation, solid content 30% by mass (A-2) LANDY PL-3000 polylactic acid dispersion, Miyoshi Oil & Fat Co., Ltd., solid content 40% by mass (A-3) ASA T-20SF hydrogenated castor oil powder, Ito Oil Mills, solid content 100% by mass (A-4) NATUREFINE H325 Hydrogenated Castor Oil Powder, Micro Powders Inc., solid content 100% by mass (A-5) NATUREFINE R331 rice wax powder, Micro Powders Inc., solid content 100% by mass (A-6) DK Ester F-140 sucrose fatty acid ester powder, Daiichi Kogyo Seiyaku Co., Ltd., solid content 100% by mass

[0085] (B-4) Joncryl (registered trademark) 67 (solid styrene acrylic resin, acid value: 213 mg KOH / g, glass transition temperature: 73°C, number average molecular weight: 13,000, BASF) dissolved in ammonia, solid content: 25% by mass (B-5) Joncryl (registered trademark) 678 (solid styrene acrylic resin, acid value: 215 mg KOH / g, glass transition temperature: 109°C, number average molecular weight: 8600, BASF) dissolved in ammonia, solid content: 25% by mass (B-6) ARUFON UC-3000 (solid acrylic resin, acid value: 74 mg KOH / g, glass transition temperature: 65°C, number average molecular weight: 10,000, Toagosei Co., Ltd.) dissolved in ammonia, solid content: 25% by mass (B-7) Hi-Loss X-1 (solid styrene acrylic resin, acid value: 116 mg KOH / g, glass transition temperature: 52°C, number average molecular weight: 16300, Seiko PMC Corporation) dissolved in ammonia, solid content: 25% by mass (B-8) Joncryl (registered trademark) 60 styrene acrylic resin solution, solid content acid value: 215 mg KOH / g, glass transition temperature: 109°C, weight average molecular weight: 8500, BASF, solid content 34% by mass (B-9) SEIKOAT RE-2194 MMA acrylic emulsion, solid acid value: 33 mg KOH / g, Seiko PMC Corporation, solid content 38% by mass The above-mentioned ammonia-dissolved solid acrylic resin or ammonia-dissolved solid styrene-acrylic resin was prepared by adding a 5% aqueous ammonia solution to the above-mentioned solid acrylic resin or solid styrene-acrylic resin so that the pH of the aqueous resin solution was within the range of 7 to 10, heating as necessary to dissolve the resin, and then adding a 5% aqueous ammonia solution and / or deionized water as necessary to achieve the above-mentioned solid content.

[0086] (3) Aqueous dispersion of polyolefin or paraffin (D) AQUACER2500, a nonionic emulsion of modified polyethylene wax, manufactured by BYK, with a solid content of 40% by mass. Chemipearl (registered trademark) W-300 Polyolefin aqueous dispersion, Mitsui Chemicals, Inc., solid content 40% by mass ZAIKXEN A Aqueous dispersion of polyolefin resin with carboxyl groups Sumitomo Seika Chemicals Co., Ltd. Solid content: 25% by mass

[0087] (4) Antifoaming agent Surfynol 420, a nonionic surfactant with an acetylene group, manufactured by Nissin Chemical Industry Co., Ltd., containing 100% active ingredients.

[0088] (5) Crosslinking agent Zinc Oxide Solution No.1 Zinc oxide crosslinker BASF, solid content 15% by mass

[0089] (6) Barrier property improver Poval JC-25 Polyvinyl alcohol aqueous solution, fully saponified poval, Nippon Vaccination & Poval Co., Ltd., solid content 5% by mass Starch: POSIT-300 cationized tapioca starch aqueous solution, Sansho Co., Ltd., solids content 5% by mass

[0090] 2. Performance evaluation of aqueous compositions The aqueous compositions and greaseproof papers of the Examples and Comparative Examples were evaluated for the following evaluation items. The results are shown in Table 2.

[0091] (1) Oil resistance In accordance with JAPAN TAPPI Paper and Pulp Test Method No. 41:2000, "Paper and Paperboard - Oil Repellency Test Method - Kit Method," a kit number test solution was prepared by mixing castor oil, toluene, and heptane in the amounts shown in Table 1. Additionally, 50 mm x 50 mm test pieces were prepared from each of the greaseproof papers of the Examples and Comparative Examples. A drop of the kit number test solution was dropped onto the surface of the test piece from a height of 25 mm using a dropper. After 15 seconds, the kit number test solution on the surface of the test piece was wiped off, and the test piece was observed for penetration of the test solution. The highest kit number that did not penetrate was recorded. The higher the kit number, the better the oil resistance. A kit number of 4 or higher (or a kit number ranked as A or B) was considered a pass. [Evaluation criteria] A: Level 5 or higher B: 4th grade C: Grade 3 or below

[0092] [Table 1]

[0093] (2) Salad oil resistance A drop of salad oil was placed on the coated surface of each greaseproof paper of the Examples and Comparative Examples, and after leaving it in an environment of 25 to 30°C for 24 hours, the salad oil was wiped off and the paper was evaluated according to the following criteria. AC was considered to be acceptable. [Evaluation criteria] A: There is almost no staining on the inside and no staining on the back. B: Slight stains on the inside. No stains on the back. C: Stain on the inside. Slight bleeding on the back. Within the usable range. D: Stain on the inside. Less than 50% of the area has seeped through to the back. E: Stain on the inside. Stain on the backside covers more than 50% of the area.

[0094] (3) Air permeability The air permeability of each greaseproof paper in the Examples and Comparative Examples was evaluated using the Gurley value (unit: seconds / 100 mL) measured in accordance with JIS P8117:2009 "Paper and Paperboard - Test Methods for Air Permeability and Air Resistance - Gurley Method." The measurement principle is as follows: Air is compressed by the vertical weight of an inner tube floating in liquid, and this air permeates the test piece, causing the inner tube to gradually descend. The time required for a certain volume of air to permeate is measured, and the air permeability is calculated from this value. Measurement of the Gurley value in accordance with JIS P8117:2009 of the present invention can be performed using, for example, a Gurley densometer manufactured by Toyo Seiki Seisakusho, Ltd. Here, the smaller the Gurley value, the better the air permeability. A and B were considered acceptable. [Evaluation criteria] A:<200 seconds B:200~500 seconds C:500 seconds<

[0095] (4) Storage stability 200 g of each aqueous composition obtained in the Examples and Comparative Examples was placed in a 225 mL glass bottle and stored at 23°C for 30 days. 20 and 30 days after the start of storage, the condition inside the container was checked and evaluated according to the following criteria. A and B were considered acceptable. [Evaluation criteria] A: No gelation occurred even after 30 days of storage B: No gelation occurred after 20 days of storage, but gelation occurred after 30 days of storage (gelation occurred between 21 and 29 days) C: Gelled after 20 days of storage (gelled within 20 days)

[0096] (5) Mechanical stability (on-board stability) 50 g of each aqueous composition obtained in the Examples and Comparative Examples was rotated for 5 minutes in a Maron-type mechanical stability tester (MS-5150, manufactured by Ueshima Seisakusho Co., Ltd.) under conditions of 98 N and 1,000 rpm, and the aqueous composition after the test was filtered through a 100-mesh stainless steel wire mesh whose mass had been measured in advance. The stainless steel wire mesh was then dried at 105°C for 1 hour, and the total mass of the filter residue and the stainless steel wire mesh after drying was measured, and the coagulation rate (% by mass) was calculated using the following formula. Flocculation rate (mass%) = (total mass [g] of dried filtration residue and stainless steel wire mesh - mass [g] of stainless steel wire mesh) / (50 [g] × solids content [mass%] of aqueous composition) × 100 Formula (1) Here, the "solid content of the aqueous composition" is the ratio of the mass of the residue when approximately 2 g of a sample of the aqueous composition is weighed into a tin dish and dried at 105°C for 1 hour to the mass before drying, and is calculated using the following formula (2). Solid content of aqueous composition [mass %] = mass of sample after drying [g] / mass of sample before drying [g] × 100 Equation (2) The evaluation criteria for mechanical stability are shown below, with A and B being considered acceptable. [Evaluation criteria] A: Aggregation rate is less than 1% by mass B: Aggregation rate is 1% by mass or more and less than 5% by mass C: The aggregation rate was 5% by mass or more, or the aqueous coating composition gelled after the test.

[0097] [Table 2] JPEG2025127473000003.jpg152170JPEG2025127473000004.jpg154170

Claims

1. An aqueous composition comprising an emulsion or dispersion (A) containing a biomass-derived material, a water-dispersible resin and / or a water-soluble resin (B) having an acid value of 30 to 230, and water (C).

2. The aqueous composition of claim 1 , wherein the biomass-derived material comprises an alcohol fatty acid ester.

3. 2. The aqueous composition according to claim 1, wherein the emulsion or dispersion (A) containing a biomass-derived material comprises a powder containing hydrogenated castor oil.

4. 2. The aqueous composition according to claim 1, wherein the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230 comprises a water-dispersible and / or water-soluble polyester resin.

5. 2. The aqueous composition according to claim 1, wherein the solids mass ratio ((A) / (B)) of the emulsion or dispersion (A) containing a biomass-derived material to the water-dispersible resin and / or water-soluble resin (B) having an acid value of 30 to 230 is 90 / 10 to 50 / 50.

6. 10. The aqueous composition of claim 1, further comprising (D) an aqueous dispersion of a polyolefin or paraffin.

7. The aqueous composition according to claim 6, wherein the aqueous dispersion of polyolefin or paraffin (D) comprises an aqueous dispersion containing a polyolefin resin.

8. 7. The aqueous composition of claim 6, wherein the aqueous dispersion of polyolefin or paraffin (D) comprises an aqueous dispersion containing a polyolefin wax.

9. 7. The aqueous composition according to claim 6, wherein the aqueous dispersion (D) of polyolefin or paraffin comprises an aqueous dispersion containing a polyethylene resin and a paraffin wax.

10. The aqueous composition of claim 1 further comprising a barrier property improver.

11. A method for producing an oil-resistant substrate, comprising applying to the substrate the aqueous composition according to any one of claims 1 to 10.

12. The method of claim 11 , wherein the substrate comprises paper.

13. A substrate coated with the aqueous composition according to any one of claims 1 to 10.

14. A coating agent comprising the aqueous composition according to any one of claims 1 to 10.

15. An oil-resistant coating agent comprising the aqueous composition according to any one of claims 1 to 10.

16. A coating agent for paper, plastic or textiles, comprising the aqueous composition according to any one of claims 1 to 10.

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