Porous Composite Powder for Adsorbing Suspended Particulate Matter and Method for Producing the Same

Abstract

To provide porous composite powder which adsorbs and removes floating particulates remaining in skin and skin pores effectively through ionic bonding, while maintaining a spherical shape allowing application without giving a foreign body sensation.SOLUTION: Porous composite powder for adsorption of floating particulates comprises a biodegradable polymer, a cationic polymer, and inorganic particles. Preferably, the biodegradable polymer and the cationic polymer may form a composite with each other on a surface of and / or inside the porous composite powder. Also provided is a method of producing porous composite powder for adsorption of floating particulates with particles forming a composite homogeneously while maintaining a spherical shape through a single process.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This specification discloses a porous composite powder excellent in the effect of adsorbing particulate matter and a method for producing the same.

Background Art

[0002] When particulate matter accumulates in the body, it may reduce the body's immunity and induce various diseases such as heart disease and respiratory diseases. In severe cases, it may cause stenosis in the bronchus, and long-term inhalation may increase the morbidity and early mortality of asthma and lung diseases.

[0003] In particular, the skin is the outermost part of the body that directly touches particulate matter, playing the role of a barrier between the organism and the environment. When the exposure to direct pollution becomes frequent, such barrier function deteriorates. Especially, since particulate matter in suspension is 20 times smaller than pores, it can easily penetrate the skin. In fact, air pollutants such as particulate matter in suspension are known to have a profound impact on skin health.

[0004] Particulate matter adhering to the skin can be mostly removed using various well-known cleansers, but it is not easy to remove particulate matter in suspension that has entered the pores. Therefore, there has been a need for research on a functional composite powder structure for effectively removing particulate matter in suspension, which is harmful to the skin remaining in the pores and causes fatal disorders to the human body. Also, since it is a raw material that acts in the pores, it is particularly important to select a safe biocompatible material without inducing irritation or the like.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In one aspect of the present invention, it is an object to effectively adsorb and remove floating particulate matter adhering to the skin or pores or sebum containing floating particulate matter using a porous composite powder.

[0007] In another aspect of the present invention, it is an object to produce a porous composite powder for adsorbing floating particulate matter in which particles are uniformly composite while maintaining a spherical form in a single step.

Means for Solving the Problems

[0008] In one aspect, the present specification provides a porous composite powder for adsorbing floating particulate matter, which contains a biodegradable polymer; a cationic polymer; and inorganic particles.

[0009] In another aspect, the present specification provides a composition for adsorbing floating particulate matter, which contains the above-described porous composite powder.

[0010] In another aspect, the present specification provides a method for producing the above-described porous composite powder, which includes a step of producing a solution containing a biodegradable polymer and a cationic polymer; a step of dispersing inorganic particles in the solution containing the biodegradable polymer and the cationic polymer; and a step of spraying and drying the solution in which the inorganic particles are dispersed.

Effects of the Invention

[0011] In one aspect, the porous composite powder for adsorbing floating particulate matter disclosed in the present specification contains a cationic polymer, and thus can effectively remove negatively charged floating particulate matter, particularly floating particulate matter having a particle size of 2.5 μm or less, by ionic bonding.

[0012] On the other hand, the porous composite powder for adsorbing suspended particulate matter disclosed in this specification uses inorganic particles as a support to maintain the form of the porous composite powder in a spherical shape, so that when a composition containing the porous composite powder is applied onto the skin, it can be applied without giving a foreign body sensation.

[0013] On the other hand, the fine particulate matter contained in moisture and sebum on the skin can be sucked into the pores of the porous composite powder disclosed in this specification, strongly adsorbed by ionic bonds, and then precipitated and removed.

[0014] On the other hand, the method for producing the porous composite powder disclosed in this specification can uniformly complex a cationic polymer on the surface and / or inside of a porous polymer in a single step using a spraying and drying technique, and produce a porous composite powder in which inorganic particles are uniformly dispersed on the surface and / or inside of the porous composite powder.

Brief Description of the Drawings

[0015]

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Mode for Carrying Out the Invention

[0016] Hereinafter, the present invention will be described more specifically through the following examples. It should be noted that the following examples are merely illustrative for the purpose of helping the understanding of the present invention, and the scope and range of the present invention are not limited thereto.

[0017] Definition of Terms In this specification, "particulate matter" is a general term for fine particles mixed in the atmosphere, and usually means suspended matter having a particle size of 10 mm or less. In particular, particulate matter with a particle size of 10 μm or less is called "suspended particulate matter", particulate matter with a particle size of 2.5 μm or less or 1 μm or less is called "fine particulate matter", and particulate matter with a particle size of 0.1 μm or less is called "ultrafine particulate matter". Here, the particle size means the average value of the diameters of each particle of the suspended particulate matter. Particulate matter is a substance containing substances derived from nature such as sand, soil, and pollen, or substances derived from industrial processes such as carbon, carbon combustion products, metal salts, and heavy metals. The form of existence of particulate matter may be fume, mist, smoke, vapor, or aerosol. Generally, the zeta potential value of particulate matter, especially suspended particulate matter, is a negative number.

[0018] In this specification, "particle size" means the diameter of a particle, and the defined particle size range means the diameter range of each single particle.

[0019] In this specification, when a certain part "includes" a certain component, this means that, unless otherwise particularly limited, it may further include other components rather than excluding other components.

[0020] Description of Exemplary Embodiments Hereinafter, the present invention will be described in detail.

[0021] Porous Composite Powder for Adsorbing Suspended Particulate Matter In an exemplary embodiment of the present invention, there is provided a porous composite powder for adsorbing suspended particulate matter, which includes a biodegradable polymer; a cationic polymer; and inorganic particles.

[0022] The porous composite powder according to an embodiment of the present invention contains a cationic polymer in order to effectively remove negatively charged suspended particulate matter by ionic bonding, introduces a biodegradable polymer that is gentle to the skin and the environment, and further contains inorganic particles, so that the porous composite powder can maintain a spherical form without being crushed.

[0023] As a result, the suspended particulate matter contained in the moisture and sebum on the skin, particularly the fine particulate matter, can be sucked into the pores of the porous composite powder and strongly adsorbed and removed by ionic bonding. In addition, when compared with the control group in terms of its excellent precipitation function and adsorption ability, it can be effectively utilized.

[0024] Generally, polyquaternium-based cationic polymers have strong irritation and odor to the skin, so a large amount cannot be used. Therefore, since it is impossible to use it as a cosmetic material with a composition of only a cationic polymer, according to one embodiment of the present invention, a biodegradable polymer that does not cause skin irritation and unpleasant odor is included as a basic framework of a porous structure, and a small amount of a cationic polymer may be added to impart cationicity.

[0025] In one embodiment, the biodegradable polymer and the cationic polymer may be complexed with each other on at least one of the surface and the inside of the porous composite powder. Further, the inorganic particles may be uniformly dispersed on at least one of the surface and the inside of the porous composite powder.

[0026] The porous composite powder according to one embodiment of the present invention is manufactured in a single step using a spraying and drying technique. On the surface and / or inside of the porous composite powder, the biodegradable polymer and the cationic polymer are complexed with each other, and the inorganic particles are uniformly dispersed on the surface and / or inside of the porous composite powder. By being complexed, pores of several hundred nanometers are retained, and a uniform suspended particulate matter adsorption effect is exhibited throughout the porous composite powder particles. Also, by being able to maintain a spherical form, it has excellent spreadability when applied to the skin.

[0027] Specifically, if the inorganic particles are not uniformly dispersed on the surface and / or inside of the porous polymer and are only coated on the surface, the inorganic particles cannot serve as a support, so shrinkage may occur inside the polymer structure and the particles may be crushed. Also, if the cation is only coated on the surface and not complexed inside, fine particulate matter of less than 1 μm (micrometer) that has entered the pores cannot be strongly adsorbed and is likely to return outside the pores.

[0028] In one embodiment, the porous composite powder may have a positive charge. In the specification, a substance having a positive charge shall mean a substance having a positive zeta potential value. The zeta potential value may be measured by a well-known method. For example, an aqueous solution containing 0.01% by weight of the sample may be prepared in a quartz cuvette, 100 μl may be loaded, and then measured using a Zetasizer Nano ZS (manufactured by Malvern) instrument.

[0029] In one embodiment, the zeta potential value of the porous composite powder may be 1 mV or more. For example, the zeta potential value may be 1.0 mV or more, 3 mV or more, 5 mV or more, 7 mV or more, 9 mV or more, 11 mV or more, 13 mV or more, 15 mV or more, 16 mV or more, 17 mV or more, or 18 mV or more, and may be 100 mV or less, 90 mV or less, 80 mV or less, 70 mV or less, 60 mV or less, 50 mV or less, 40 mV or less, 30 mV or less, 25 mV or less, 23 mV or less, 20 mV or less, 19 mV or less, 18 mV or less, 17 mV or less, 16 mV or less, 15 mV or less, 14 mV or less, or 13 mV or less.

[0030] When the zeta potential value is less than 1 mV, the adsorption effect of suspended particulate matter by ionic bonding may decrease. When the zeta potential value exceeds 100 mV, it may induce skin irritation, the odor may become stronger, and it may affect the stability of the dosage form.

[0031] In one embodiment, the size of the porous composite powder may be 50 μm or less. The size of the porous composite powder is measured as the maximum length of the porous composite powder.

[0032] The size of the porous composite powder may be, for example, 50 μm or less, 45 μm or less, 40 μm or less, 35 μm or less, 30 μm or less, 25 μm or less, 20 μm or less, 19 μm or less, 18 μm or less, 17 μm or less, 16 μm or less, 15 μm or less, 14 μm or less, 13 μm or less, 12 μm or less, 11 μm or less, 10 μm or less, 9 μm or less, 8 μm or less, 7 μm or less, 6 μm or less, 5 μm or less, 4 μm or less, 3 μm or less, 2 μm or less, or 1 μm or less, and may also be 1 μm or more, 2 μm or more, 3 μm or more, 4 μm or more, 5 μm or more, 6 μm or more, 7 μm or more, 8 μm or more, 9 μm or more, 10 μm or more, 11 μm or more, 12 μm or more, 13 μm or more, 14 μm or more, 15 μm or more, 20 μm or more.

[0033] When the size of the porous composite powder exceeds 50 μm, it may give a foreign body sensation when applied to the skin. When it is less than 1 μm, it may be difficult to sufficiently absorb sebum on the skin containing particulate matter.

[0034] In this specification, the range of the size of the porous composite powder means that 90% or more, 95% or more, or 99% or more of the porous composite powder particles belong within the range. For example, the porous composite powder having a size belonging within the range of 50 μm or less may be 90% or more, 91% or more, 92% or more, 93% or more, 94% or more, 95% or more, 96% or more, 97% or more, 98% or more, 99% or more, 99.1% or more, 99.2% or more, 99.3% or more, 99.4% or more, 99.5% or more, 99.6% or more, 99.7% or more, 99.8% or more, 99.9% or more based on the total number of the composite powders, but is not limited thereto.

[0035] Due to the characteristics of the spraying and drying process, it is difficult to produce particles with uniform size, and a diverse distribution of particle sizes is advantageous for adsorbing particles. For example, when rice and beans are mixed, it is the same principle that the rice is positioned between the beans, resulting in higher packing efficiency. In addition, when the particle sizes are uniform, the probability of contacting the fine particulate matter existing in the voids between those particles may be reduced, leading to inferior adsorption efficiency. Therefore, according to an embodiment of the present invention, it is distributed with diverse particle sizes within the size range (50 μm or less) that can sufficiently adsorb the floating particulate matter without causing a foreign body sensation on the skin, which is advantageous for adsorbing the fine particulate matter without leakage.

[0036] The pore size in the porous composite powder may be 10 nm to 1 μm. The pore size may be, for example, 10 nm or more, 30 nm or more, 50 nm or more, 70 nm or more, 100 nm or more, 150 nm or more, 200 nm or more, 350 nm or more, 400 nm or more, 450 nm or more, 500 nm or more, 550 nm or more, 600 nm or more, 650 nm or more, 700 nm or more, 750 nm or more, 800 nm or more, 850 nm or more, 900 nm or more, or 950 nm or more, and may be 1 μm or less, 950 nm or less, 900 nm or less, 850 nm or less, 800 nm or less, 750 nm or less, 700 nm or less, 650 nm or less, 600 nm or less, 550 nm or less, 500 nm or less, 450 nm or less, 400 nm or less, 350 nm or less, 300 nm or less, 250 nm or less, 200 nm or less, 150 nm or less, 100 nm or less, 70 nm or less, 40 nm or less, or 20 nm or less.

[0037] When the pore size is less than 10 nm, it may be difficult to suck in sebum containing floating particulate matter, and when it exceeds 1 μm, the mechanical strength decreases, increasing the likelihood that the particles are easily broken.

[0038] The porous composite powder according to an embodiment of the present invention has pores sized from several tens of nm (nanometers) to 1 μm (micrometers), and can adsorb not only fine particulate matter (PM2.5) with a size of 2.5 μm or less but also fine particulate matter (PM1.0) with a size of 1 μm or less inside the pores. Moreover, fine particulate matter or suspended particulate matter having a size larger than this and unable to be adsorbed inside the pores can be adsorbed on the surface and removed from the skin.

[0039] In the case of fine particulate matter, it has a diverse particle size distribution and contains a considerable portion of particles with a size of 1 μm or less. However, since particles with a size of 1 μm or less have an even higher possibility of skin penetration and are far more harmful, the performance to remove them is required, but it was not easy to remove with existing materials and dosage form technologies. On the other hand, in the case of the porous composite powder according to an embodiment of the present invention, it is advantageous in adsorbing particles with a size of 1 μm or less by principles such as osmotic pressure compared to existing particles with large pores.

[0040] In one embodiment, the porosity of the porous composite powder may be 30 to 80%, for example, 30% or more, 35% or more, 40% or more, 45% or more, 50% or more, 55% or more, 60% or more, and may be 80% or less, 75% or less, 70% or less, or 65% or less. The porosity means the overall ratio of pores that can actually absorb sebum containing suspended particulate matter. If it is less than 30%, the effect of adsorbing suspended particulate matter may be negligible, and if it exceeds 80%, the mechanical strength may decrease and the particles may be more likely to break.

[0041] In one embodiment, the biodegradable polymer may be one or more selected from the group consisting of polylactic acid (PLA), polyglycolic acid (PGA), poly(lactic-co-glycolic acid) (PLGA), polycaprolactone (PCL), cellulose, and derivatives thereof. In this specification, by applying a biodegradable polymer, it is possible to eliminate plastic microbead issues and at the same time improve biocompatibility with the skin despite acting within pores.

[0042] In one embodiment, the cationic polymer may be one or more selected from the group consisting of polyquaternium-based compounds, cationic guar gum derivatives, chitosan, and polylysine.

[0043] In one embodiment, the cationic polymer may be one or more selected from the group consisting of polyquaternium-4, polyquaternium-6, polyquaternium-7, polyquaternium-10, polyquaternium-11, polyquaternium-22, polyquaternium-24, polyquaternium-37, polyquaternium-39, and polyquaternium-100.

[0044] In one embodiment, the inorganic particles may be one or more selected from the group consisting of TiO2, ZnO, iron oxide, mica, sericite, volcanic ash, silica, and mud.

[0045] In one embodiment, the inorganic particles may be TiO2.

[0046] In one embodiment, the inorganic particles may be one or more of volcanic ash and silica.

[0047] In one embodiment, the porous composite powder for suspended particulate matter may contain 3 to 60% by weight of a biodegradable polymer, 0.1 to 10% by weight of a cationic polymer, and 35 to 90% by weight of inorganic particles, based on the total weight of the porous composite powder.

[0048] For example, the content of the biodegradable polymer may be 3% by weight or more, 5% by weight or more, 10% by weight or more, 15% by weight or more, 20% by weight or more, 25% by weight or more, 30% by weight or more, 35% by weight or more, 40% by weight or more, 45% by weight or more, or 50% by weight or more, and 60% by weight or less, 55% by weight or less, 50% by weight or less, 45% by weight or less, 40% by weight or less, 35% by weight or less, 30% by weight or less, or 25% by weight or less, based on the total weight of the porous composite powder.

[0049] When the content of the biodegradable polymer is less than 3% by weight, the content of the inorganic particles becomes relatively excessive, and the biodegradable polymer cannot serve as a bond or binder for the inorganic particles, making it difficult to form composite powder particles with a porous structure. Also, when the content of the biodegradable polymer exceeds 60% by weight, the ratio of the inorganic particles decreases, and excessive shrinkage may occur during the particle formation process, causing the particles to collapse. Therefore, when appropriately satisfying the above range, composite powder particles with a porous structure can be formed.

[0050] For example, the content of the cationic polymer may be 0.1% by weight or more, 0.5% by weight or more, 1% by weight or more, 1.5% by weight or more, 2% by weight or more, 2.5% by weight or more, 3% by weight or more, 3.5% by weight or more, 4% by weight or more, 4.5% by weight or more, or 5% by weight or more, and 10% by weight or less, 9.5% by weight or less, 9% by weight or less, 8.5% by weight or less, 8% by weight or less, 7.5% by weight or less, 7% by weight or less, 6.5% by weight or less, 6% by weight or less, 5.5% by weight or less, or 5% by weight or less, based on the total weight of the porous composite powder.

[0051] If the content of the cationic polymer is less than 0.1% by weight, it is insufficient to impart cationicity, and the zeta potential value of the porous composite powder may be low, reducing the adsorption effect of the floating particulate matter with a negative charge. Also, if it exceeds 10% by weight, it may induce skin irritation and have a strong amine odor, making it unsuitable for use in cosmetics.

[0052] For example, the content of the inorganic particles may be 35% by weight or more, 40% by weight or more, 45% by weight or more, 50% by weight or more, 55% by weight or more, 60% by weight or more, 65% by weight or more, 70% by weight or more, or 75% by weight or more, based on the total weight of the porous composite powder, and may be 90% by weight or less, 85% by weight or less, 80% by weight or less, 75% by weight or less, 70% by weight or less, 65% by weight or less, 60% by weight or less, 55% by weight or less, 50% by weight or less, or 45% by weight or less.

[0053] If the content of the inorganic particles is less than 35% by weight, it may be difficult to maintain the form of the porous composite powder. Also, if it exceeds 90% by weight, the content of the biodegradable polymer serving as a binder may be too low, and the particles themselves may not be able to form and may collapse.

[0054] In one embodiment, the porous composite powder can adsorb floating particulate matter with a particle size of 2.5 μm or less. For example, it can also remove fine particulate matter with a particle size of 2 μm or less, 1.5 μm or less, or 1 μm or less. According to one aspect of the present invention, generally, pores are at the 30 - 200 μm level. Even if fine floating particulate matter with a small particle size penetrates into the pores, the porous composite powder according to one embodiment of the present invention can penetrate into the pores together and easily remove the negatively charged floating particulate matter mixed with sebum in the pores to the outside of the pores by ionic bonding. Therefore, harmful substances on the skin can be easily removed during cleansing.

[0055] In an exemplary embodiment of the present invention, a composition for adsorbing floating particulate matter containing the above-described porous composite powder is provided.

[0056] In one embodiment, the content of the porous composite powder may be 1 to 30% by weight based on the total weight of the composition. For example, it may be 1% by weight or more, 5% by weight or more, 10% by weight or more, 15% by weight or more, 20% by weight or more, or 25% by weight or more, and may be 30% by weight or less, 25% by weight or less, 20% by weight or less, 15% by weight or less, 10% by weight or less, or 5% by weight or less. When the content is less than 1% by weight, the adsorption effect of suspended particulate matter may be negligible. When it exceeds 30% by weight, skin irritation may be induced, the odor may become stronger, or a foreign body sensation may be felt. In addition, an increase in the content of the porous composite powder having a positive charge may affect the dosage form stability.

[0057] In one embodiment, the composition may be a cosmetic composition, and the outer form of the cosmetic composition contains a medium or base that is cosmetically or dermatologically acceptable. This may be in any dosage form suitable for topical application, for example, in the form of a solution, gel, solid, anhydrous kneaded product, emulsion obtained by dispersing an oil phase in an aqueous phase, suspension, microemulsion, microcapsule, fine granulocyte or vesicle dispersant of ionic (liposome) and non-ionic types, or in the form of a cream, skin, lotion, powder, ointment, spray or concealer stick. These compositions may be manufactured by conventional methods in the art. In addition, the composition according to the present invention may also be used in the form of a foam or in the form of an aerosol composition further containing a compressed propellant.

[0058] The cosmetic composition according to an embodiment of the present invention is not particularly limited in its dosage form. For example, it may be formulated into cosmetics such as a softening lotion, astringent lotion, nourishing lotion, nourishing cream, massage cream, essence, eye cream, eye essence, cleansing cream, cleansing foam, cleansing water, cleansing tissue containing the cosmetic composition, pack, powder, body lotion, body cream, body oil and body essence.

[0059] When the dosage form of the present invention is a paste, cream or gel, as the carrier component, animal fibers, plant fibers, wax, paraffin, starch, tragacanth, cellulose derivatives, polyethylene glycol, silicon, bentonite, silica, talc, or zinc oxide, etc. may be used.

[0060] When the dosage form of the present invention is a powder or spray, as the carrier component, lactose, talc, silica, aluminum hydroxide, calcium silicate, or polyamide powder may be used. In particular, when it is a spray, it may further contain a propellant such as chlorofluorohydrocarbon, propane / butane, or dimethyl ether.

[0061] When the dosage form of the present invention is a solution or emulsion, as the carrier component, a solvent, a solvate, or an emulsifying agent may be used. For example, water, ethanol, isopropanol, ethyl carbonate, ethyl acetate, benzyl alcohol, benzyl benzoate, propylene glycol, 1,3-butyl glycol oil, glycerol fatty acid ester, polyethylene glycol, or sorbitan fatty acid ester may be mentioned.

[0062] When the dosage form of the present invention is a suspension, as the carrier component, a liquid diluent such as water, ethanol, or propylene glycol, a suspending agent such as ethoxylated isostearyl alcohol, polyoxyethylene sorbitol ester, and polyoxyethylene sorbitan ester, microcrystalline cellulose, aluminum metahydroxide, bentonite, agar, or tragacanth, etc. may be used.

[0063] When the dosage form of the present invention is surfactant-containing cleansing, as the carrier component, aliphatic alcohol sulfate, aliphatic alcohol ether sulfate, sulfosuccinic acid monoester, isethionate, imidazolinium derivative, methyl taurate, sarcosinate, fatty acid amide ether sulfate, alkylamide betaine, aliphatic alcohol, fatty acid glyceride, fatty acid diethanolamide, vegetable oil, linolenic derivative, or ethoxylated glycerol fatty acid ester may be used.

[0064] In the cosmetic composition according to an embodiment of the present invention, in addition to the porous composite powder, functional additives and components contained in general cosmetic compositions may further be included. The functional additives may include components selected from the group consisting of water-soluble vitamins, oil-soluble vitamins, high molecular weight peptides, high molecular weight polysaccharides, sphingolipids, and seaweed extracts.

[0065] In the cosmetic composition according to the present invention, further, together with the functional additives, components contained in general cosmetic compositions may be blended as necessary. Other blending components include oil and fat components, moisturizers, emollients, surfactants, organic and inorganic pigments, organic powders, ultraviolet absorbers, preservatives, bactericides, antioxidants, plant extracts, pH adjusters, alcohols, pigments, fragrances, blood circulation promoters, cooling agents, antiperspirants, purified water, and the like.

[0066] In one embodiment, the cosmetic composition may be one or more selected from the group consisting of cleansing cream, cleansing foam, and cleansing water.

[0067] Method for Producing Porous Composite Powder for Adsorbing Suspended Particulate Matter In an exemplary embodiment of the present invention, there is provided a method for producing a porous composite powder for adsorbing floating particulate matter, which includes the steps of producing a solution containing a biodegradable polymer and a cationic polymer; dispersing inorganic particles in the solution containing the biodegradable polymer and the cationic polymer; and spraying and drying the solution in which the inorganic particles are dispersed.

[0068] Specifically, referring to FIG. 1, the biodegradable polymer and the cationic polymer are dissolved in an organic solvent to prepare a solution containing the biodegradable polymer, and inorganic particles can be added to the solution and dispersed using a homogenizer. Thereafter, the solution in which the inorganic particles are dispersed can be sprayed and dried through a nozzle to produce a porous composite powder for adsorbing floating particulate matter.

[0069] According to an embodiment of the present invention, the cationic polymer may be in a dissolved state in the solution together with the biodegradable polymer, and the inorganic particles may be in a uniformly dispersed state in the solution. Only when the cationic polymer is dissolved in the solvent together with the biodegradable polymer, can a porous composite powder be formed in a form (complexation) entangled between the polymer chains while being precipitated together with the biodegradable polymer during subsequent spraying.

[0070] In this way, complexation of the cationic polymer inside and / or on the surface of the biodegradable polymer is performed using the spraying and drying technique, and a porous composite powder uniformly impregnated with inorganic particles can be easily produced in a single step.

[0071] At this time, the internal humidity of the spraying and drying device may be maintained at 30% or more, the internal temperature may be maintained at room temperature, and spraying and drying may be performed under the conditions of a feed rate of 20%, an aspirator of 70%, and 20 atm.

[0072] In one embodiment, during the spraying and drying, the solution in which the inorganic particles are dispersed may be stirred in a container before flowing into the pump during the spraying and drying, thereby preventing the inorganic particles from precipitating before spraying and drying.

[0073] In one embodiment, the solvent of the solution containing the biodegradable polymer and the cationic polymer may be one or more selected from the group consisting of dichloromethane (Dichloromethane anhydrous), ethanol, and acetone, and preferably may be dichloromethane.

[0074] In one embodiment, after the spraying and drying step, a washing and drying step may be further included. For example, a step of washing with methanol and tray drying may be further included, whereby a porous composite powder with residual solvent completely removed can be obtained.

[0075] In another exemplary embodiment of the present invention, a method of applying the above-described porous composite powder to the skin to adsorb suspended particulate matter is provided.

[0076] In another exemplary embodiment of the present invention, a method of applying a composition containing the above-described porous composite powder to the skin to adsorb suspended particulate matter is provided.

[0077] In another exemplary embodiment of the present invention, a use of the above-described porous composite powder is provided, and the use is for manufacturing a composition for adsorbing suspended particulate matter.

[0078] In another exemplary embodiment of the present invention, a use of the above-described porous composite powder for adsorbing suspended particulate matter is provided.

[0079] Hereinafter, the present invention will be described more specifically by the following examples. It should be noted that the following examples are merely illustrative for the purpose of helping the understanding of the present invention, and the scope and range of the present invention are not limited thereto.

[0080] Examples Example 1 - Manufacture of Porous Composite Powder for Suspended Particulate Matter (AP Sphere - 1) To produce a porous composite powder for suspended particulate matter (AP Sphere), a lactic acid / glycolic acid copolymer (PLGA, manufactured by GALACTIC), titanium dioxide (TiO2, manufactured by Daito Kase, OTS-2 TiO2CR-50), polyquaternium-10 (PQ10), a cationic polymer (manufactured by The Dow Chemical Company, Ucare polymer JR-30), and dichloromethane (DCM, Dichloromethane anhydrous, manufactured by Sigma-Aldrich, purity > 99.8%) were prepared.

[0081] Thereafter, using the spraying and drying equipment as shown in Fig. 1, a porous composite powder for suspended particulate matter (hereinafter referred to as AP Sphere-1) was produced according to the following steps.

[0082] [Spray-Prying Process] 1) Dissolve 45 g of PLGA and 5 g of PQ10 in 1 L of the solvent DCM. 2) After putting 50 g of TiO2 into the solution, disperse it using a homogenizer. 3) Spray-dry the dispersion solution. 4) Keep the internal humidity of the spray dryer at 30% or more and keep the internal temperature at room temperature. 5) Spray-dry under the conditions of Feed rate: 20%, Aspirator: 70%, and 20 atm. The dispersion solution is continuously stirred by a stirrer during spray-drying. 6) After drying the spray-dried composite powder to completely remove the residual solvent, obtain it.

[0083] As a result of the experiment, as shown in FIGS. 2a and 2b, uniform impregnation of TiO2 into the interior of the porous polymer was enabled, and pores with a size of several hundred nanometers were formed from the surface photograph, and it was confirmed that TiO2 particles were densely impregnated. Specifically, it was shown that the size of the porous composite powder was about 10 to 50 μm (micrometers), and the pore size was at the level of about 10 nm to 1 μm.

[0084] Test Example 1 - Measurement of Zeta Potential of Porous Composite Powder The surface charge was confirmed for the porous composite powder of Example 1 (PLGA:TIO2:PQ10 = 45:50:5) and the porous composite powder (PLGA:TIO2:PQ10 = 50:50:00) produced in the same manner as in Example 1 except that it did not contain a cationic polymer as a control group. An aqueous solution containing 0.01% by weight of the sample was prepared in a quartz cuvette, 100 μl was loaded, and then the zeta potential was measured using a Zetasizer Nano ZS (manufactured by Malvern) instrument.

[0085] Referring to FIG. 3, it can be confirmed that the surface charge of AP Sphere-1 was converted from an anion (-26.8 mV) (Record 95: AP Sphere) to a cation (+18.9 mV) (Record 96: AP Sphere+) by the addition of a cation.

[0086] Test Example 2 - Oil Absorption Evaluation In order to confirm whether AP Sphere-1 can effectively suck sebum containing particulate matter into the pores, the oil absorption amount for MCT oil (CAS.No73398-61-5) having physical properties most similar to sebum was tested by the following method using the existing oil absorption measurement equipment (S-500, manufactured by Asahi Souken, FIG. 4), and the results are shown in FIG. 5.

[0087] [Test Method] 1) After measuring the weight of the powder to be measured, it is put into the sample chamber. 2) When starting the operation, the oil pump drops oil into the chamber drop by drop, and in the chamber, two mixers rotate to knead the powder and the oil. 3) As the amount of oil input increases, the torque value applied to the mixer also increases, and when the maximum value is reached, the test is completed. 4) At this time, the value obtained by dividing the amount of oil (ml) corresponding to 70% of the maximum torque by the amount of the sample (g) is calculated as the oil absorption amount (ml / g) of the powder.

[0088] The control group used volcanic ash (INCI name: Volcanic Ash) and cheap mud (INCI name: Sea Silt), which are adsorption materials frequently used in existing mask pack products. As shown in Figure 5, it was confirmed that AP Sphere-1 has an oil absorption capacity 2 to 3 times higher than that of existing adsorption materials. That is, it can absorb a much larger amount of fine particulate matter contained in sebum, and since it captures it inside the pores, it can be said that the effect of isolating harmful fine particulate matter from the skin is great.

[0089] Test Example 3 - Zeta Potential and Adsorption Capacity Evaluation To evaluate the fine particulate matter adsorption capacity of AP Sphere-1 (Figure 6g), as a control group, cellulose particles (Comprecel, Figure 6a) used as a scrubbing agent, three types of silica (Neosil, Figure 6b / Spherica P-1500, Figure 6c / Lucidsil, Figure 6d), spherical PMMA particles (Art Pearl, Figure 6e), and porous PMMA particles (Sunpmma coco-170, Figure 6f) having various zeta potentials were used.

[0090] First, as a result of measuring the zeta potential of the control groups shown in FIGS. 6a to 6f, the zeta potentials were found to be FIG. 6a: Comprecel (-20.7 mV), FIG. 6b: Neosil (-21.3 mV), FIG. 6c: Spherica P-1500 (-15.5 mV), FIG. 6d: Lucidsil (-13.0 mV), FIG. 6e: Art Pearl K-7 (-29.7 mV), and FIG. 6f: Sunpmma coco-170 (-20.8 mV), respectively. It was confirmed that all the particles in the control groups were negatively charged. In contrast, the zeta potential of AP Sphere-1 (FIG. 6g) was confirmed to be +18.9 mV.

[0091] Subsequently, the adsorption ability was evaluated by the following test method.

[0092] [Test Method] 1) Disperse 1 mg of the standard substance of particulate matter (SRM 1650b) in 10 g of ethanol using ultrasonic waves. 2) Add 500 mg of the powder to be tested to the dispersion, stir with a magnetic stirrer for 5 minutes, and then let it stand. 3) After filtering with filter paper, observe the hue of the filtrate. 4) Measure the transmittance with a turbidimeter. As a result of the evaluation of the adsorption ability, when powder particles are added to a solution in which the standard substance of particulate matter (SRM 1650b) is dispersed and stirred, adsorption occurs. However, if the powder particles are light, no precipitation occurs even after stirring is stopped and the mixture is left standing for a long time, and they remain suspended in the dispersion. Under such conditions, it is difficult to accurately compare the adsorption ability of particulate matter between powder particles.

[0093] At this time, when filtering with filter paper, all the floating particulate matter adsorbed to the powder is removed, and only the particulate matter that has not been adsorbed remains. By measuring the transmittance of this filtrate, the adsorption ability of particulate matter can be quantitatively compared.

[0094] The results of the experiment are shown in Figs. 7a, 7b, and 8b. In Figs. 7a and 7b, the samples, in order from the left, correspond to those that have not been processed at all (a), cellulose particles (Comprecel, b), three types of silica (Neosil, c / Spherica P-1500, d / Lucidsil, e), spherical PMMA particles (Art Pearl, f), porous PMMA particles (Sunpmma coco-170, g), and those containing AP Sphere-1 (h).

[0095] As a result of the experiment, referring to Fig. 7a, the negatively charged powder particles in the control group could not precipitate the particulate matter and the dispersion was black. Only in the case of the porous polymer Sunpmma particles (g), some precipitation occurred and the dispersion became slightly thinner. On the other hand, when AP Sphere-1 (h) was added, it was confirmed that most of the particulate matter was adsorbed / precipitated and the dispersion became very transparent. AP Sphere-1 (h) contains more than 50% of TiO2 that serves as a support. Therefore, it is judged that its performance of adsorbing and precipitating particulate matter is much superior because its density is higher than that of silica and PMMA particles. (Fig. 7a)

[0096] After that, the samples were filtered through filter paper and the filtrate was observed. It was confirmed that the cellulose powder (Comprecel, b) had almost no change in hue even after filtration and its ability to adsorb particulate matter was very poor. In the case of the other samples, although there were differences in degree, a phenomenon in which the hue became lighter after filtration was observed in all cases. In the case of AP Sphere-1 (h), it was confirmed that it became almost transparent after filtration (Fig. 7b).

[0097] For quantitative evaluation, the transmittance of each filtrate was measured using the turbidimeter shown in Fig. 8a. As a result, although the ability to adsorb fine particulate matter was confirmed for some powders, perfect removal of fine particulate matter has not yet been achieved. On the other hand, the transmittance of the filtrate of AP Sphere-1 was 0.75 NTU, which was confirmed to be an extremely excellent level close to the standard of 0.5 NTU for potable water in South Korea (Fig. 8b).

[0098] From these results, it was verified by visual RTB that AP Sphere-1, which has a porous structure advantageous for adsorption, contains TiO2 advantageous for precipitation, and converts the charges on the surface and inside the pores into cations, can most effectively adsorb and precipitate fine particulate matter by ionic bonding.

[0099] Test Example 4 - Evaluation of Adsorption Ability by Cationic Polymer (PQ10) In order to intensively analyze the role of the cationic polymer, adsorption experiments were conducted in the following combinations. Four cases were tested: the sole use of the cationic polymer (PQ10) (a), the sole use of AP Sphere (No PQ10) (b), the simple mixed use of AP Sphere (No PQ10) and PQ10 (c), and the sole use of the composite powder of AP Sphere-1 (with PQ10) (d) in a solution in which a standard substance of fine particulate matter was dispersed (Fig. 9).

[0100] As a result of the experiment, there was no fine particulate matter adsorption effect when the cationic polymer (PQ10) (a) and AP Sphere (NO PQ10) (b) were used alone. There was also almost no fine particulate matter adsorption effect when AP Sphere (NO PQ10) and the cationic polymer (PQ10) were used in a simple mixture (c). In contrast, it was confirmed that the effect of adsorbing and precipitating fine particulate matter was excellent only when the composite powder of AP Sphere-1 (With PQ10) (d) combined with cations was used.

[0101] Test Example 5 - Column Passing Test To more visually confirm the mechanism by which fine particulate matter is adsorbed onto AP Sphere-1, after packing AP Sphere-1 into a column, a fine particulate matter dispersion was loaded and the hue of the eluent passing through the column was observed. The results of the experiment are shown in Figure 10, divided into start (a), middle (b), and completion (c).

[0102] As a result of the experiment, fine particulate matter was adsorbed onto the layer packed with AP Sphere and a black layer was observed, and all the eluents were transparent (Figure 10).

[0103] Test Example 6 - AP PM2.5 Adsorption Experiment An adsorption experiment was conducted on the actual fine particulate matter AP PM2.5 collected on the rooftop of the Amorepacific Technology Research Institute. AP PM2.5 was collected using a polytetrafluoroethylene (PTFE) filter (Zefluor TM manufactured by Pall Life Science, Mexico), and then extracted by ultrasonic treatment in ethanol for 30 minutes.

[0104] It was confirmed by SEM analysis that AP PM2.5 consists of particles with a size of 2.5 μm or less (Figure 11), and it was confirmed by ICP-MS analysis that it contains five heavy metals (As, Cd, Sb, Pb, Ni) (Table 1 below). The measurement result of the zeta potential confirmed that it has a negative charge of -11.7 mV.

[0105]

Table 1

[0106] The results of adsorption are shown in Fig. 12, divided into (a) AP PM2.5 dispersion liquid, (b) stirring after adding AP Sphere-1, and (c) after 1 hour has passed. Referring to Fig. 12, when stirring is started after adding AP Sphere-1, adsorption with AP PM2.5 begins while it changes to gray overall. After stopping the stirring and about 1 hour has passed, it was confirmed that all the particulate matter had precipitated and was in a transparent state as shown in Fig. 12(c). It was also confirmed that AP Sphere has excellent removal ability not only for foreign particulate matter standard substances but also for samples of particulate matter of AP PM2.5 (including 5 heavy metals) collected on the roof of Amorepacific Technology Research Institute.

[0107] Test Example 7 - Evaluation of the Ability of Foam Cleansing Dosage Forms to Remove Particulate Matter Based on the already filed Japanese Patent Application No. 10-2017-0154993 (Pore Mimetic, Method for Evaluating Substances Having Skin Cleansing Power Using the Same, and Screening Method for Substances Having Skin Cleansing Power Using the Same), a cleansing foam dosage form containing 5% by weight of AP Sphere-1 was manufactured with the formulation as shown in Table 2 below, and the ability to remove particulate matter was evaluated by the following test method, and the results are shown in Figs. 13a to 13b.

[0108]

Table 2

[0109] [Preparation of Samples and Pore Mimetics] - Sample: Standard Substance of Particulate Matter (SRM 1650b) - Solution Concentration: 5% in D.I water or TG (triglyceride) oil - Area of Pore Mimetic Frame: 2.5 cm × 1.25 cm (Size of One Pore Mimetic: Circular with a Diameter of 200 μm)

[0110] [Test Method] 1) Apply 0.1 g of the fine particulate matter sample uniformly to the pore-mimicking body frame (frame). 2) Check and photograph the application state with an optical microscope (x4 magnification) (10 shots). 3) Apply 1 g of the foam cleansing agent form and 0.5 ml of water. 4) Rub 30 times with fingers and then rinse with flowing water. 5) Remove moisture with Kimtech or air-dry naturally for 20 - 30 minutes. 6) Check the cleaning state with an optical microscope (x4 magnification) (10 shots).

[0111] [Analysis of the cleaning (removal) power of fine particulate matter] The captured images were analyzed using an image analysis program (image-pro). Specifically, after aligning the image positions before and after using the product, cropping (crop) and extracting the common area, the area value was analyzed for the entire area of each image. Here, the lower the value (the total area value of the black pixels corresponding to the fine particulate matter, pix^2), the more the fine particulate matter in the pores was removed (cleaned).

[0112] Referring to FIGS. 13a - 13b, as a result of observing the remaining fine particulate matter after washing with the cleansing foam, it was confirmed that all the fine particulate matter in the pores was completely removed cleanly. As a result of the image analysis, it was confirmed that, compared with the state before washing (FIG. 13a), the sample area of the fine particulate matter in the pore-mimicking part significantly decreased to 99.941% after application and washing with the cleansing foam agent form (FIG. 13b). From this, it was confirmed that APSphere-1 can exhibit an actual effect on the removal of fine particulate matter even in the actual agent form.

[0113] Test Example 8 - Evaluation of the adsorption ability by inorganic particles (TiO2) As a comparison group for the TiO₂-impregnated AP Sphere-1, particles were produced using 95 g of a biodegradable polymer and 5 g of a cationic polymer, excluding TiO₂. This is to set the content of the cationic polymer, which plays a decisive role in the adsorption ability of suspended particulate matter by ionic bonds, equal to 5 g.

[0114] As a result of observation with an electron microscope, it was confirmed that when the inorganic powder acting as a support was excluded, particles with a shape in which the polymer particles shrank and collapsed were produced during the spraying and drying process (Figs. 14a, 14b). Particles of such a shape have a very low sebum absorption amount of about 0.13 ml / g, so the adsorption ability of fine particulate matter becomes significantly inferior. Therefore, in one embodiment of the present invention, it can be confirmed that it is essential to impregnate inorganic particles acting as a support so as to keep the particles from collapsing and ensure the porosity.

[0115] Example 2 - Production of Porous Composite Powder for Suspended Particulate Matter (AP Sphere-2) A porous composite powder for suspended particulate matter (AP Sphere-2) containing volcanic ash and silica was produced as the inorganic particles instead of TiO₂. 45 wt% of volcanic ash, 30 wt% of silica (Lucidsil), 24 wt% of a biodegradable polymer (PLGA), and 1 wt% of a cationic polymer (PQ10) were added, and a composite powder (Volcanic Plus, AP Sphere-2) was produced as shown in Fig. 15 in the spraying and drying process in the same manner as AP Sphere-1. As a result of analysis by an electron microscope, it was confirmed that the porous structure was retained and the volcanic ash and silica particles were uniformly impregnated (Fig. 15).

[0116] Also, as a result of the analysis of the oil absorption amount in the same manner as in Test Example 2, it was confirmed that, as shown in Fig. 19, the oil absorption amount increased very much to about 1.56 ml / g due to the influence of silica (Lucidsil) having excellent oil absorption amount together with the porous structure.

[0117] Test Example 9 - Zeta Potential Measurement of Porous Composite Powder Regarding the measurement results of the zeta potential, in the case of Volcanic Sphere excluding only PQ10 from the same composition, the surface charge was -17.1 mV, whereas in the case of Volcanic Plus (AP Sphere-2) with PQ10 added, it was confirmed that the surface charge was converted to a positive charge of +12.5 mV (Figure 16).

[0118] Test Example 10 - Adsorption Capacity Evaluation For Volcanic Plus (AP Sphere-2) and Volcanic Sphere excluding only PQ10, an adsorption test for particulate matter was carried out in the same manner as in Test Example 3. The experimental results are shown in Figures 17a to 17c, which show the cases of leaving after powder input and stirring (Figure 17a), filtering with filter paper (Figure 17b), and the filtrate (Figure 17c), respectively. In each figure, it is possible to confirm the non-treated sample (a), Volcanic Sphere (b), and Volcanic Plus (AP Sphere-2) (c).

[0119] The results of the adsorption test for particulate matter (SRM 1650) also showed a tendency similar to that of AP Sphere-1 and an excellent effect. It was found that Volcanic Plus (AP Sphere-2), which was converted to a positive charge compared to the negatively charged Volcanic Sphere, had extremely excellent performance in adsorbing and precipitating particulate matter (Figures 17a to 17c).

[0120] As a result of measuring the transmittance of each filtrate using the turbidimeter in Figure 8a for quantitative evaluation, it was confirmed that Volcanic Plus (AP Sphere-2) was superior in the performance of adsorbing particulate matter by more than 122 times compared to Volcanic Sphere. In the case of the Volcanic Plus (AP Sphere-2) filtrate, a value of 0.48 NTU, which is lower than the transmittance standard of 0.5 NTU for potable drinking water in the country, was shown (Figure 18).

[0121] Specific Example Specific Example 1: A biodegradable polymer; A cationic polymer; and Inorganic particles; A porous composite powder for adsorbing suspended particulate matter containing the same.

[0122] Specific Example 2: The biodegradable polymer and the cationic polymer are compounded with each other at least on one of the surface and the inside of the porous composite powder. The porous composite powder for adsorbing suspended particulate matter according to Specific Example 1.

[0123] Specific Example 3: The porous composite powder has a positive charge. The porous composite powder for adsorbing suspended particulate matter according to Specific Example 1 or 2.

[0124] Specific Example 4: The zeta potential value of the porous composite powder is 1 mV or more. The porous composite powder for adsorbing suspended particulate matter according to any one of Specific Examples 1 to 3.

[0125] Specific Example 5: The size of the porous composite powder is 50 μm or less. The porous composite powder for adsorbing suspended particulate matter according to any one of Specific Examples 1 to 4.

[0126] Specific Example 6: The size of the pores in the porous composite powder is 10 nm to 1 μm. The porous composite powder for adsorbing suspended particulate matter according to any one of Specific Examples 1 to 5.

[0127] Specific Example 7: The porosity of the porous composite powder is 30 to 80%. The porous composite powder for adsorbing suspended particulate matter according to any one of Specific Examples 1 to 6.

[0128] Specific Example 8: The biodegradable polymer is one or more selected from the group consisting of polylactic acid (PLA), polyglycolic acid (PGA), poly(lactic-co-glycolic acid) (PLGA), polycaprolactone (PCL), cellulose, and derivatives thereof. The porous composite powder for adsorbing suspended particulate matter according to any one of Specific Examples 1 to 7.

[0129] Specific Example 9: The cationic polymer is one or more selected from the group consisting of polyquaternium-based compounds, cationic guar gum derivatives, chitosan, and polylysine, and is the porous composite powder for adsorbing suspended particulate matter according to any one of Specific Examples 1 to 8.

[0130] Specific Example 10: The cationic polymer is one or more selected from the group consisting of polyquaternium-4, polyquaternium-6, polyquaternium-7, polyquaternium-10, polyquaternium-11, polyquaternium-22, polyquaternium-24, polyquaternium-37, polyquaternium-39, and polyquaternium-100, and is the porous composite powder for adsorbing suspended particulate matter according to any one of Specific Examples 1 to 9.

[0131] Specific Example 11: The inorganic particles are one or more selected from the group consisting of TiO2, ZnO, iron oxide, mica, sericite, volcanic ash, silica, and mud, and is the porous composite powder for adsorbing suspended particulate matter according to any one of Specific Examples 1 to 10.

[0132] Specific Example 12: The inorganic particle is TiO2, and is the porous composite powder for adsorbing suspended particulate matter according to any one of Specific Examples 1 to 11.

[0133] Specific Example 13: Based on the total weight of the porous composite powder, the biodegradable polymer is 3 to 60% by weight, the cationic polymer is 0.1 to 10% by weight, and the inorganic particles are 35 to 90% by weight, and is the porous composite powder for adsorbing suspended particulate matter according to any one of Specific Examples 1 to 12.

[0134] Specific Example 14: The porous composite powder adsorbs suspended particulate matter having a particle size of 2.5 μm or less, and is the porous composite powder for adsorbing suspended particulate matter according to any one of Specific Examples 1 to 13.

[0135] Specific Example 15: A method for adsorbing suspended particulate matter, comprising applying to the skin a composition containing the porous composite powder described in any one of Specific Examples 1 to 14.

[0136] Specific Example 16: The method for adsorbing suspended particulate matter according to Specific Example 15, wherein the content of the porous composite powder is 1 to 30% by weight based on the total weight of the composition.

[0137] Specific Example 17: The method for adsorbing suspended particulate matter according to Specific Example 15 or 16, wherein the composition is a cosmetic composition.

[0138] Specific Example 18: The method for adsorbing suspended particulate matter according to Specific Example 17, wherein the cosmetic composition is one or more selected from the group consisting of a cleansing cream, a cleansing foam, and a cleansing water.

[0139] Specific Example 19: A method for producing the porous composite powder described in any one of Specific Examples 1 to 14, comprising: producing a solution containing a biodegradable polymer and a cationic polymer; dispersing inorganic particles in the solution containing the biodegradable polymer and the cationic polymer; and spraying and drying the solution in which the inorganic particles are dispersed; A method for producing a porous composite powder for adsorbing suspended particulate matter.

[0140] Specific Example 20: The method for producing a porous composite powder for adsorbing suspended particulate matter according to Specific Example 19, wherein the spraying and drying are performed at room temperature.

[0141] Specific Example 21: The method for producing a porous composite powder for adsorbing suspended particulate matter according to Specific Example 19 or 20, wherein the solution in which the inorganic particles are dispersed is stirred during the spraying and drying.

[0142] Specific Example 22: The production method of the porous composite powder for adsorbing suspended particulate matter according to any one of Specific Examples 19 to 21, wherein the solvent of the solution containing the biodegradable polymer and the cationic polymer is one or more selected from the group consisting of dichloromethane (Dichloromethane anhydrous), ethanol, and acetone.

[0143] Specific Example 23: The production method of the porous composite powder for adsorbing suspended particulate matter according to any one of Specific Examples 19 to 22, further including a step of washing and drying after the spraying and drying step.

Explanation of Reference Signs

[0144] 10 Heater 20 Nozzle 30 Drying Chamber 40 Cyclone 50 Product Container 60 Suction Device 70 Filter

Claims

1. A biodegradable polymer; A cationic polymer; and Inorganic particles; a porous composite powder for adsorbing suspended particulate matter containing the same.

2. The biodegradable polymer and the cationic polymer are compounded with each other at least on one of the surface and the inside of the porous composite powder. The porous composite powder for adsorbing suspended particulate matter according to Claim 1.

3. The porous composite powder has a positive charge. The porous composite powder for adsorbing suspended particulate matter according to Claim 1 or 2.

4. The zeta potential value of the porous composite powder is 1 mV or more. The porous composite powder for adsorbing suspended particulate matter according to any one of Claims 1 to 3.

5. The size of the porous composite powder is 50 μm or less. The porous composite powder for adsorbing suspended particulate matter according to any one of Claims 1 to 4.

6. The size of the pores in the porous composite powder is 10 nm to 1 μm. The porous composite powder for adsorbing suspended particulate matter according to any one of Claims 1 to 5.

7. The porosity of the porous composite powder is 30 to 80%. The porous composite powder for adsorbing suspended particulate matter according to any one of Claims 1 to 6.

8. The biodegradable polymer is one or more selected from the group consisting of polylactic acid (Polylactic acid, PLA), polyglycolic acid (Polyglycolic acid, PGA), polylactic acid / glycolic acid copolymer (Poly(lactic-co-glycolic acid), PLGA), polycaprolactone (Polycaprolactone, PCL), cellulose, and derivatives thereof. The porous composite powder for adsorbing suspended particulate matter according to any one of Claims 1 to 7.

9. The cationic polymer is one or more selected from the group consisting of polyquaternium-based compounds, cationic guar gum derivatives, chitosan, and polylysine (Polylisine). The porous composite powder for adsorbing suspended particulate matter according to any one of Claims 1 to 8.

10. The cationic polymer is one or more selected from the group consisting of polyquaternium-4, polyquaternium-6, polyquaternium-7, polyquaternium-10, polyquaternium-11, polyquaternium-22, polyquaternium-24, polyquaternium-37, polyquaternium-39, and polyquaternium-100. The porous composite powder for adsorbing suspended particulate matter according to any one of claims 1 to 9.

11. The inorganic particles are one or more selected from the group consisting of TiO ２ , ZnO, iron oxide, mica, sericite, volcanic ash, silica, and mud, and are the porous composite powder for adsorbing suspended particulate matter according to any one of claims 1 to 10.

12. The inorganic particles are TiO ２ The porous composite powder for adsorbing floating particulate matter according to any one of claims 1 to 11, which is such.

13. Based on the total weight of the porous composite powder, 3 to 60% by weight of a biodegradable polymer, 0.1 to 10% by weight of a cationic polymer, and 35 to 90% by weight of inorganic particles. The porous composite powder for adsorbing suspended particulate matter according to any one of claims 1 to 12.

14. The porous composite powder adsorbs suspended particulate matter having a particle size of 2.5 μm or less. The porous composite powder for adsorbing suspended particulate matter according to any one of claims 1 to 13.

15. A composition for adsorbing suspended particulate matter containing the porous composite powder according to any one of claims 1 to 14.

16. Based on the total weight of the composition, the content of the porous composite powder is 1 to 30% by weight. The composition for adsorbing suspended particulate matter according to claim 15.

17. The composition is a cosmetic composition. The composition for adsorbing suspended particulate matter according to claim 15 or 16.

18. The cosmetic composition is one or more selected from the group consisting of cleansing cream, cleansing foam, and cleansing water. The composition for adsorbing suspended particulate matter according to claim 17.

19. A method for producing the porous composite powder according to any one of claims 1 to 14, Producing a solution containing a biodegradable polymer and a cationic polymer; Dispersing inorganic particles in the solution containing the biodegradable polymer and the cationic polymer; and Spraying and drying the solution in which the inorganic particles are dispersed. A method for producing a porous composite powder for adsorbing suspended particulate matter.

20. The spraying and drying are performed at room temperature. The method for producing a porous composite powder for adsorbing suspended particulate matter according to claim 19.

21. Stirring the solution in which the inorganic particles are dispersed during the spraying and drying. The method for producing a porous composite powder for adsorbing suspended particulate matter according to claim 19 or 20.

22. The solvent of the solution containing the biodegradable polymer and the cationic polymer is one or more selected from the group consisting of dichloromethane (Dichloromethane anhydrous), ethanol, and acetone. The method for producing a porous composite powder for adsorbing suspended particulate matter according to any one of claims 19 to 21.

23. The method for producing a porous composite powder for adsorbing suspended particulate matter according to any one of claims 19 to 22, further comprising a step of washing and drying after the spraying and drying step.

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