WO2019143017A1 - 고흡수성 수지의 제조 방법 - Google Patents
고흡수성 수지의 제조 방법 Download PDFInfo
- Publication number
- WO2019143017A1 WO2019143017A1 PCT/KR2018/015191 KR2018015191W WO2019143017A1 WO 2019143017 A1 WO2019143017 A1 WO 2019143017A1 KR 2018015191 W KR2018015191 W KR 2018015191W WO 2019143017 A1 WO2019143017 A1 WO 2019143017A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fine
- assembly
- water
- pulverized
- drying
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
- C08J3/245—Differential crosslinking of one polymer with one crosslinking type, e.g. surface crosslinking
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/075—Macromolecular gels
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/14—Water soluble or water swellable polymers, e.g. aqueous gels
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
- C08J2333/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C08J2333/08—Homopolymers or copolymers of acrylic acid esters
Definitions
- the present invention relates to a method for producing a superabsorbent resin. More specifically, it is possible to reduce the amount of water used during re-assembly of fine powders, reduce the energy during drying, reduce the process cost, reduce the load on the apparatus, To a method for producing a superabsorbent resin.
- Super Absorbent Polymer It is a synthetic polymer material having a function of absorbing moisture of about 500 to 1,000 times of the weight of lanzai. It has begun to be put into practical use as a physiological tool, and currently, As well as hygiene products, are widely used as soil remediation agents for gardening, index materials for civil engineering and construction, sheets for seedling growing, freshness keeping agents in the field of food distribution, and fomentation materials.
- the absorption mechanism of such a superabsorbent resin is characterized in that the absorption mechanism of the superabsorbent resin is a combination of the permeation pressure due to the difference in electrical attraction represented by the charge of the polymer electrolyte, the affinity between water and the polymer electrolyte, the molecular expansion due to the repulsion between the polymer electrolyte ions, That is, the absorbency of the superabsorbent resin depends on the above-described affinity and molecular expansion, and the rate of absorption is strongly dependent on the permeation pressure of the absorbent polymer itself.
- the fine powder is generated at a rate of about 20 to 30% in the pulverization or transferring process during the production of the superabsorbent resin.
- the main physical properties of the superabsorbent resin may cause a decrease in the pressure absorbing ability or the permeability. Therefore, during the manufacturing process of the aqueous resin, particularly in the classification process, And then separated into the remaining polymer particles to produce a water absorbent resin.
- the thus separated fine particles are again made into large particles through a reassembling process, and a method of manufacturing / using such reassembled particles again as a superabsorbent resin is known.
- a method of manufacturing / using such reassembled particles again as a superabsorbent resin is known.
- a method of manufacturing a fine particle-dispersed assembly and a superabsorbent resin by mixing the fine powders with water and coagulating them.
- the present invention provides a method for manufacturing a superabsorbent resin which enables production of a fine pulverized material having excellent physical properties while exhibiting a reduced amount of funnel production while having an advantage in process by reducing the amount of water used in the manufacture of microbes.
- the present invention relates to a process for producing a hydrogel polymer, which comprises thermally polymerizing or photopolymerizing a monomer composition comprising a water-soluble ethylenically unsaturated monomer and a polymerization initiator to produce a hydrogel polymer;
- the hydrogel polymer was dried and pulverized to prepare a gel.
- the method of producing a superabsorbent resin according to the present invention can reduce the amount of water used during pulverization, reduce energy during drying, reduce the cost of the process, and reduce the load of the apparatus with a minimum drying process.
- the present invention it is possible to improve the strength of the fine pulverizing assembly by applying the pressing process of a specific condition while having the above-described process advantages, and as a result, And a superabsorbent resin and a superabsorbent resin exhibiting superior physical properties, for example, a high absorption rate and an excellent absorption capacity can be obtained.
- Figs. 1 to 5 are photographs (left) after mixing the fine powder and water and reassembling in Comparative Examples 1 to 5, and electron micrographs (right) showing the particle shape of the finally prepared fine powder compact.
- FIGS. 6 and 7 are electron micrographs showing the particle morphology of the pressed separator assembly finally produced in Examples 1 and 2.
- FIG. 6 and 7 are electron micrographs showing the particle morphology of the pressed separator assembly finally produced in Examples 1 and 2.
- a process for producing a hydrogel polymer which comprises thermally polymerizing or photopolymerizing a monomer composition comprising a water-soluble ethylenically unsaturated monomer and a polymerization initiator to produce a hydrogel polymer; Drying and pulverizing the hydrogel polymer to obtain a fine particle having a particle diameter of 150 or less and a normal particle having a particle diameter of 150 to 850 or less; Mixing the fine powder with water, and reassembling to prepare a fine pulverized product; And 1 to 30 parts by weight of water is used for 100 parts by weight of the fine powder in the finely pulverizing assembly step, Wherein the step of manufacturing the pressurized pulverulent assembly includes pressing the pulverized pulverulent assembly at a temperature of 40 to 105 ° (:).
- the amount of fun powder can be reduced to a level that is at least as high as the case of applying the increased water use amount.
- a superabsorbent resin exhibiting a high absorption rate and an excellent absorption capacity can be produced.
- due to the reduction in the amount of water used it is possible to reduce the energy required for drying after the pulverization and reassembly, reduce the cost of the process, and reduce the load of the device with a minimum drying process.
- a fine particle-water re-granulation process having various process advantages and a manufacturing process of a super absorbent resin using the same can be carried out, and thus a super absorbent resin exhibiting excellent physical properties can be manufactured.
- the method for producing the superabsorbent resin of one embodiment will be described in more detail by each step.
- the term "polymer” or “polymer” means that the water-soluble ethylenically unsaturated monomer is in a polymerized state and may cover all moisture content ranges, all particle diameter ranges, all surface cross- .
- a polymer having a moisture content (moisture content) of about 40% by weight or more and being in a state before drying after polymerization can be referred to as a hydrogel polymer.
- a polymer having a particle size of 150 L / L or less may be referred to as "fine powder ".
- the "superabsorbent resin” means the polymer itself according to the context, or the polymer may be subjected to further processes such as surface crosslinking, fine particle reassembling, drying, crushing, classification, And the like.
- the functional gel polymer is first prepared.
- the hydrogel polymer may be prepared by subjecting a monomer composition comprising a water-soluble ethylenically unsaturated monomer and a polymerization initiator to thermal polymerization or photopolymerization.
- the monomer composition which is a raw material of the superabsorbent resin includes a water-soluble ethylenically unsaturated monomer and a polymerization initiator.
- the water-soluble ethylenically unsaturated monomer may be any monomer conventionally used in the production of a superabsorbent resin without any particular limitations.
- at least one monomer selected from the group consisting of an anionic monomer and its salt, a nonionic hydrophilic-containing monomer and an amino group-containing unsaturated monomer and a quaternary car- bon thereof may be used.
- acrylic acid or a salt thereof for example, an alkali metal salt such as acrylic acid or sodium salt thereof can be used.
- an alkali metal salt such as acrylic acid or sodium salt thereof
- acrylic acid may be neutralized with a basic compound such as sodium hydroxide (NaOH).
- the concentration of the water-soluble ethylenically unsaturated monomer may be about 20 to about 60% by weight, preferably about 40 to about 50% by weight, based on the monomer composition including the raw material and the solvent of the superabsorbent resin, It may be an appropriate concentration considering time and reaction conditions. However, if the concentration of the monomer is excessively low, the yield of the superabsorbent resin may be low and economical efficiency may be deteriorated. On the other hand, if the concentration is excessively high, a part of the monomer may precipitate or the pulverization efficiency may be low And the physical properties of the superabsorbent resin may be deteriorated.
- the polymerization initiator used in polymerization in the method of manufacturing a solid body aqueous resin of one embodiment is not particularly limited as long as it is generally used in the production of a superabsorbent resin.
- the polymerization initiator a thermal polymerization initiator or a photopolymerization initiator based on UV irradiation may be used depending on the polymerization method.
- a certain amount of heat is generated by irradiation with ultraviolet light or the like, and furthermore, a certain amount of heat is generated as the polymerization reaction, which is a heat generation reaction, proceeds. .
- the photopolymerization initiator can be used without limitation in the constitution as long as it is a compound capable of forming a radical by light such as ultraviolet rays.
- the photopolymerization initiator includes, for example, benzoin ether, diacyl acetophenone, hydroxyl alkylketone, phenyl glyoxylate, benzyl dimethyl ketal dimethyl ketal, acyl phosphine, and a-aminoketone may be used.
- acylphosphine a commonly used lucirin TPO, that is, 2,4,6-trimethyl-benzoyl-trimethyl phosphine oxide can be used .
- More photoinitiators are well described in Reinhold Schwalm, "UV Coatings: Basics, Recent Developments and New Applications (Elsevier 2007) " p. 115, and are not limited to the above examples.
- the concentration of the photopolymerization initiator is too low, the polymerization rate may be slowed. If the concentration of the photopolymerization initiator is excessively high, the concentration of the photopolymerization initiator may be lowered The molecular weight may be lower and the physical properties may become uneven.
- thermal polymerization initiator at least one selected from persulfate-based initiators, azo-based initiators, initiators consisting of hydrogen peroxide and ascorbic acid can be used.
- persulfate-based initiator include sodium persulfate (Na 2 S 208), potassium persulfate (Potassium persulfate;
- azo initiators include 2, 2-azobis- (2-amidinopropane) Azobis- (N, N-dimethylene) dihydrochloride, 2,2-azobis (2-amidinopropane) dihydrochloride, isobutyramidine dihydrochloride), 2-
- the thermal polymerization initiator may be contained in a concentration of 0.001 to 0.5% by weight based on the monomer composition. If the concentration of such a thermal polymerization initiator is too low, additional thermal polymerization hardly occurs and the effect of addition of the thermal polymerization initiator may be insignificant. If the concentration of the thermal polymerization initiator is too high The molecular weight of the superabsorbent resin is small and the physical properties may be uneven.
- the monomer composition may further include an internal cross-linking agent as a raw material for the high-water-based resin.
- an internal crosslinking agent a crosslinking agent having at least one functional group capable of reacting with the water-soluble substituent of the water-soluble ethylenically unsaturated monomer and having at least one ethylenic unsaturated group; Or a crosslinking agent having two or more functional groups capable of reacting with water-soluble substituents and / or water-soluble substituents formed by hydrolysis of the monomers.
- the internal crosslinking agent include bisacrylamide having 8 to 12 carbon atoms, bismethacrylamide, poly (meth) acrylate of polyol having 2 to 10 carbon atoms or poly (meth) allyl ether of polyol having 2 to 10 carbon atoms (Meth) acrylate, ethyleneoxy (meth) acrylate, polyethyleneoxy (meth) acrylate, propyleneoxy (meth) acrylate, glycerin diacrylate At least one selected from the group consisting of glycerin triacrylate, trimethylol triacrylate, triallylamine, triaryl cyanurate, triallyl isocyanate, polyethylene glycol, diethylene glycol and propylene glycol can be used.
- Such an internal crosslinking agent is contained at a concentration of 0.01 to 0.5% by weight based on the monomer composition, so that the polymerized polymer can be crosslinked.
- the monomer composition of the superabsorbent resin may further contain additives such as a thickener, a plasticizer, a preservative stabilizer, and an antioxidant, if necessary.
- the raw materials such as the above-mentioned water-soluble ethylenically unsaturated monomers, photopolymerization initiators, thermal polymerization initiators, internal cross-linking agents and additives can be prepared in the form of a monomer composition solution dissolved in a solvent.
- the solvent which can be used at this time can be used without limitation of its constitution as long as it can dissolve the above-mentioned components.
- examples thereof include water, ethanol, ethylene glycol, diethylene glycol, triethylene glycol, 1,4- Glycol, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, methyl ethyl ketone, acetone, methyl amyl ketone, One selected from the group consisting of cyclohexanone, cyclopentanone, diethylene glycol monomethyl ether, diethylene glycol ethyl ether, toluene, xylenes, butylolactone, carbitol, methylcellosolve acetate and 1 ⁇ These can be used in combination.
- the solvent may be included in the balance of the total amount of the monomer composition excluding the components described above.
- the method of forming a hydrogel polymer by thermal polymerization or photopolymerization of such a monomer composition is not particularly limited as long as it is a commonly used polymerization method.
- the polymerization method can be roughly divided into thermal polymerization and photopolymerization depending on the polymerization energy source.
- the polymerization can proceed in a reactor having agitated porosity as in the case of Neder's lineage.
- the polymerization method described above is merely an example, and the polymerization method is not limited to the above-described polymerization method.
- the hydrogel polymer obtained by supplying hot air or by heating the reactor to a reactor such as a kneader 6301 having an agitating shaft as described above) is heated to a reactor outlet (not shown) depending on the shape of the stirring shaft provided in the reactor
- the discharged hydrogel polymer may be in the range of a few centimeters to a few millimeters.
- the size of the resulting hydrogel polymer may vary depending on the concentration of the monomer composition to be injected, the rate of injection, etc. In general, a hydrogel polymer having a weight average particle diameter of 2 to 50 beads may be obtained.
- the form of the hydrogel polymer that is usually obtained may be a hydrogel polymer on a sheet having a belt width.
- the thickness of the polymer sheet varies depending on the concentration and the injection rate of the monomer composition to be injected, but it is preferable to supply the monomer composition so that a polymer in a sheet having a thickness of usually about 0.5 to about 5 can be obtained.
- the monomer composition is supplied to such an extent that the thickness of the polymer in the sheet is too thin, it is undesirable because the production efficiency is low, and when the thickness of the polymer on the sheet is more than 50 11 , due to the excessively thick thickness, It happens I can not.
- the normal water content of the hydrogel polymer obtained by such a method may be 40 to 80% by weight.
- the term "moisture content” means the moisture content of the total functional gelated polymer weight minus the weight of the hydrogel polymer in dry state. Specifically, it is defined as a value calculated by measuring the weight loss due to moisture evaporation in the polymer in the process of raising the temperature of the polymer through infrared heating.
- the drying condition is a method of raising the temperature from room temperature to 180 ° C and then keeping it at 180 ° C, and the total drying time is set to 20 minutes including the temperature rising step for 5 minutes, and water content is measured.
- a crude grinding process can optionally be further performed on the hydrogel polymer obtained above.
- the pulverizer used in the coarsely pulverizing process is not limited in its structure, but may be a vertical pulverizer, a turbo cutter, a turbo grinder, a rotary cutter a crusher, a crusher, a chopper, and a disk cutter, which are selected from the group consisting of a mill, a cutter mill, a disc mill, a shred crusher, a crusher, a chopper and a disc cutter But it is not limited to the above example.
- the coarse grinding step can be comminuted to a size of about 2 to about 20 mm in diameter of the hydrogel polymer.
- Coarse pulverization with a particle size of less than 2 mm is not technically easy due to the high water content of the hydrogel polymer, and may also result in agglomeration of the pulverized particles.
- the grain size exceeds 20 mm, the effect of increasing the efficiency of the subsequent drying step may be insignificant.
- the hydrogel polymer in the method of producing a superabsorbent resin according to an embodiment of the present invention, after the hydrogel polymer is prepared, the hydrogel polymer can be dried and pulverized to classify it into fine particles and normal particles.
- the drying process is performed on the hydrogel polymer immediately after the polymerization without crude pulverization or crude pulverization.
- the drying temperature exceeds 250 ° C, only the polymer surface is excessively dried, Fine powder may be generated in the pulverizing step, and the physical properties of the ultrafine water-absorbent resin to be finally formed may be lowered.
- the drying can proceed at a temperature of from about 150 to about 200 ° C, more preferably from about 160 to about 180 ° C.
- drying time it may proceed for about 20 to about 90 minutes in consideration of the process efficiency and the like, but is not limited thereto.
- the drying method in the drying step may be selected and used as long as it is usually used as a drying step of the hydrogel polymer. Specifically, the drying step can be carried out by hot air supply, infrared irradiation, microwave irradiation, ultraviolet irradiation, or the like.
- the water content of the polymer after such a drying step may be from about 0.1 to about 10% by weight.
- the polymer powder obtained after the pulverization step may have a particle diameter of about 150 to about 850 rn.
- the pulverizer used for pulverizing to such a particle size is specifically a pin mill, a hammer mill, a screw a roll mill, a disc mill or a jog mill may be used.
- the invention is not limited to the above-mentioned examples.
- the polymer powder obtained after pulverization is generally classified according to the particle size.
- the fine particles having a particle size of less than a certain particle size, that is, less than about 150 / solution are referred to as superabsorbent polymer fine particles, SAP fine particles or fine fines, and particles having a particle diameter of 150 to 850 ≪ / RTI >
- the fineness may be generated during the polymerization, drying or grinding of the dried polymer. If the final product contains a fine powder,
- the re-assembly process may be used to coagulate the fine particles to have a normal particle size.
- a reassembly process is generally performed in which the fine particles are agglomerated in a wet state in order to increase the cohesion strength.
- the higher the moisture content of the fine particles the higher the cohesive strength of the fine powders, but the larger the re-assembly mass, the larger the mass of the re-assembled mass may cause problems in the process operation. Thereafter, it is often broken down again as differential (fun eruption).
- a fine pulverized material is produced by using the fine powder classified in the above step. More specifically, in such a reassembling step, the fine powder is subjected to a process of mixing and reassembling it with water, wherein water is added in an amount of 1 to 30 parts by weight, or 3 to 27 parts by weight, or 5 To 20 parts by weight. If the content of water is less than 1 part by weight, it is difficult to uniformly disperse a small amount of water due to a fast absorption rate of the fine powder in the mixing process of the fine powder and water, thereby lowering the uniformity of the fine powder compact.
- the step of preparing the fine particle dispersion can be carried out by mixing the fine powder and water at 300 to 2000 rpm under stirring using a mixing device or a mixer capable of applying a shearing force.
- the crimped fine bimaterial assembly may be manufactured by using the fine finely divided assembly.
- the step of producing the crimped fine finely divided assembly may include pressing, grinding, And then proceeding to a step of producing a pressurized pulverized pulverized product, and in particular, a step of compacting the pulverized pulverized product at a temperature of 40 to 105 ° C, or 40 to 90 ° C, or 45 to 75 ° C Can proceed.
- the pressed compacting assembly having a high strength is manufactured while reducing the amount of water used in the reassembling process described above, Can be obtained.
- the squeezing process for the unprocessed bonsai assembly may be performed using a conventional extruder capable of squeezing and cutting a pulverized material assembly such as, for example, a (mit) chopper, For example, a blade or a scrapper installed at a hole of the hole plate.
- a conventional extruder capable of squeezing and cutting a pulverized material assembly
- a (mit) chopper For example, a blade or a scrapper installed at a hole of the hole plate.
- the Romi bonsai assembly in the meat chopper is put in, the pulverized assembly is pressed by the meat chopper, And is cut into a particle shape by the blade located on the plate discharge port side.
- the crushed differential granules cut into granules are re-combined due to the tackiness at the cut portion, resulting in a stem-shaped secondary granule.
- the pressed compacting assembly produced in the above step is dried and pulverized and classified into a re-assembly fine powder (hereinafter referred to as "fun powder") and a re- Step can proceed.
- the fun fraction and the remanufactured steady-state particles each have a particle size of 150 m or less It may have a particle size of less than 150/850 / / III.
- the drying process may be performed using a conventional drying device, but may be performed using a paddle-type dryer according to an embodiment of the present invention.
- the crimped fine pulverization product of the stem shape can be easily primary-granulated as the recombination is easily broken by the force generated when the paddle flows. As a result, the drying speed and drying efficiency for the crimped fine granulation product can be further increased.
- the drying step may be performed at a temperature of 120 to 22 ° C. If the temperature is lower than 120 ⁇ ⁇ in the drying step, the drying time becomes longer. If the temperature is higher than 220 ⁇ ⁇ , the properties of the fine powder compact may deteriorate and the properties may deteriorate. More preferably 150 to 20, so that the moisture content in the fine pulverized material is 1% by weight or less.
- the temperature of the dryer inlet is 120 to 160 ⁇ ⁇ at the beginning of the drying process, and the temperature of the latter stage of the drying process, specifically, the outlet of the dryer downstream stage is 150 to 200 ⁇ ⁇ .
- the heating medium can be supplied or heated directly by means such as electricity.
- the present invention is not limited to the above-described example no.
- Specific examples of the heat source that can be used include steam, electricity, ultraviolet rays, and infrared rays, and heated heat fluids and the like may be used.
- the drying step may be performed such that the moisture content in the dried pressed biscuit assembly is 1% by weight or more, more specifically, 2% by weight. If the water content in the dried pressed compacted granules is less than 1% by weight, the properties of the fine pulverized product may be deteriorated.
- the pulverized pulverized pulverized product in the form of a stem is primary-shaped in the form of a single particle.
- the compacted pulverulent pulverized product obtained after the pulverization step is pulverized and then pulverized again into fine powder, that is, Cohesive strength.
- the crushable pulverized pulverulent assembly may have a weight ratio of pulverized pulverized pulverized pulp having a particle size of 150 or less to about 50 wt% or less, or 45 wt% or less, based on the weight of the entire pulverized pulverized pulverized product.
- the crushed fine pulverized product obtained after pulverization has a particle diameter
- the CRC measured according to 241.3 is 33.0 to 45.0 ding phrases, and the absorption rate by the vortex method (Zortex) may be less than 50 seconds.
- the absorption rate by the vortex method (Zortex) may be less than 50 seconds.
- 50 011 of saline was poured into a 100 0 11 beaker together with a magnetic stirring bar, the stirring speed of the magnetic stirring bar was set to 600 171 by using a stirrer, and 2.0 parts of fine powder mill And the time is measured, and the time (unit: second) taken until the vortex disappears in the beaker is measured as the vortex time.
- the lower limit value of the absorption rate is not particularly limited, but may be about 20 seconds or more, or about 30 seconds or more.
- the compacted bimetallic assembly has a moisture content of 30% or less, and thus can exhibit excellent particle strength even though it has a low moisture content.
- the milling may be carried out so that the dried pressed differential milling assembly has a particle size of about 150 to about 850 / L. Used to grind to such a particle size
- the polymer powder obtained after pulverization is generally classified according to the particle size.
- a funnel having a particle size of less than 150 / A
- a re-assembly normal particle having a particle size of more than 150 to 850 or less.
- a superabsorbent resin can be produced by using the pressurized fine granular material produced by the above-described method, particularly, It is possible to prepare a superabsorbent resin by selectively cross-linking with other untreated normal particles.
- the 150 ⁇ excess material assembly normal particles having a particle size of less than 850_ is already mixed with the above-described normal particles.
- the surface cross-linking process may be selectively performed by further introducing the remodeling normal particles and the normal particles into the surface cross-linking mixer.
- the surface cross-linking is a step of increasing the cross-linking density near the surface of the superabsorbent polymer particle in relation to the cross-linking density inside the particle.
- the surface cross-linking agent is applied to the surface of the superabsorbent resin particles.
- this reaction takes place on the surface of the superabsorbent resin particles, which improves the crosslinkability on the surface of the particles without substantially affecting the interior of the particles.
- the surface cross-linked superabsorbent resin particles have a higher degree of crosslinking in the vicinity of the surface than in the interior.
- the surface cross-linking agent is not limited as long as it is a compound capable of reacting with a functional group contained in the polymer.
- the polyfunctional alcohol compound, the epoxy compound, the polyamine compound, the haloepoxy compound, A condensation product of a haloepoxy compound; Oxazoline compounds; Mono-, di- or polyoxazolidinone compounds; Cyclic urea compounds; Polyvalent metal salts; And an alkylene carbonate compound can be used.
- polyhydric alcohol compound examples include mono-, di-, tri-, tetra- or polyethylene glycol, monopropylene glycol, 1, 3-propanediol, dipropylene glycol, 2,3,4- Butanediol, 1,3-butanediol, 1,5-pentanediol, 1,6-nucleic acid diol, and the like; 1,2-cyclohexane dimethanol, and 1,2-cyclohexane dimethanol.
- epoxy compounds examples include ethylene glycol diglycidyl ether and glycidol.
- polyamine compounds examples include ethylene diamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylene nucleus amine, Polyethyleneimine and polyamidepolyamines can be used.
- haloepoxy compound epichlorohydrin, epibromohydrin and 0 ( -methyl epichlorohydrin can be used.
- mono-, di- or polyoxazolidinone compounds for example, 2-oxazolidinone compounds Dinonone, etc.
- alkylene carbonate compounds ethylene carbonate and the like can be used. These can be used alone or in combination with each other.
- the amount of the surface crosslinking agent added is not particularly limited so long as the kind of the surface crosslinking agent May be appropriately selected according to the reaction conditions, but it is usually from about 0.001 to about 5 Preferably about 0.01 to about 3 parts by weight, more preferably about 0.05 to about 2 parts by weight, based on 100 parts by weight of the composition .
- the content of the surface cross-linking agent is too small, surface cross-linking reaction hardly occurs. If the amount of the surface cross-linking agent is more than 5 parts by weight based on 100 parts by weight of the polymer, excessive absorption of the surface cross- .
- the surface cross-linking reaction and the drying can be performed at the same time by heating the polymer particles to which the surface cross-linking agent has been added.
- the temperature raising means for the surface cross-linking reaction is not particularly limited.
- a heating medium can be supplied, or a heating source can be directly supplied and heated.
- the type of usable heat medium it is possible to use a heated fluid such as steam, hot air or hot oil.
- the present invention is not limited thereto, and the temperature of the heat medium to be supplied can be controlled by means of heat medium, It can be appropriately selected in consideration of the target temperature.
- a heat source to be directly supplied a heating method using electricity or a heating method using gas may be mentioned, but the present invention is not limited to the above-mentioned examples.
- the superabsorbent resin prepared by the above-mentioned method is a polymer obtained by polymerizing a water-soluble ethylenically unsaturated monomer containing an acidic group and neutralized with at least a part of the acidic groups,
- the absorption capacity measured according to ZVSP 241.3 is 33.0 to 45.0 and the absorption rate by the vortex method is 50 seconds.
- the polymer is obtained by polymerizing a water-soluble ethylenically unsaturated monomer having an acidic group and at least a part of the acidic groups neutralized.
- the pulverized product was dried in a hot-air drier at 170 ° C for 1 hour, pulverized with a pin mill, To obtain fine particles having a particle size of more than 150 and less than or equal to 850_ and fine particles having a particle diameter of less than or equal to 150.
- Production Examples of the Un-air drier at 170 ° C for 1 hour, pulverized with a pin mill, To obtain fine particles having a particle size of more than 150 and less than or equal to 850_ and fine particles having a particle diameter of less than or equal to 150.
- the internally recovered washer assembly was dried in a forced circulation dryer at 185 ⁇ for 1 hour.
- the funnel fraction with a particle size of less than 150_ was found to be 81.2% by weight.
- the particle shape of the thus-prepared fine particle-dispersion assembly was analyzed by an electron microscope, and the photograph was shown on the right side of Fig. Comparative Example 2
- a fine pulverized product was prepared in the same manner as in Comparative Example 1, except that water 1 was used in the reassembling process.
- the photograph after the reassembly is shown in the left photograph of Fig. 2, and the non-water-miscible fine powder was observed.
- a fine pulverized material was prepared in the same manner as in Comparative Example 1 except that the water 2 was used in the reassembling process.
- the photograph after the reassembly is shown in the left photograph of FIG. 3, and the unmixed water is not observed.
- the particle shape of the finely pulverized re-assembly finally produced was analyzed by an electron microscope and the photograph is shown on the right side of FIG.
- the fun fraction ratio of Comparative Example 3 was confirmed to be 53.1% by weight. Comparative Example 4
- a fine pulverized product was prepared in the same manner as in Comparative Example 1, except that water 40 was used in the reassembling process.
- the photograph after the reassembly is shown in the left photograph of FIG. 4, and the unmixed water is not observed.
- a fine pulverized product was prepared in the same manner as in Comparative Example 1 except that the water 12 was used in the reassembling process.
- the photograph after the reassembly is shown in the left photograph of FIG. 5, and the unmixed water is not observed.
- Example 1 the shape of particles of the finally prepared fine particle re-assembly was analyzed by an electron microscope, and the photograph was shown on the right side of FIG. The fun fraction ratio of Comparative Example 5 was found to be 22.8% by weight.
- Example 1 the shape of particles of the finally prepared fine particle re-assembly was analyzed by an electron microscope, and the photograph was shown on the right side of FIG. The fun fraction ratio of Comparative Example 5 was found to be 22.8% by weight.
- the reassembled body recovered from the inside of the mixer was put into a heated muffler whose temperature of the outer wall was heated and pressed. At this time, the temperature of the extruded compacted disassembly assembly was confirmed to be 45 ° C.
- the extruded compacted bonsai assembly was dried in a forced circulation type drier at 185 ° C. for 1 hour.
- the dried reassembly was crushed with a Hammer mill, and as a result, the funnel fraction having a particle size of less than 50 im was found to be 47.7 wt%.
- the particle shape of the compacted fine particle dispersion thus prepared was analyzed by an electron microscope The photograph is shown in Fig. Example 2
- a finely divided assembly and a crimped fine bimaterial assembly were prepared in the same manner as in Example 1, except that the temperature of the crimped fine bimaterial assembly discharged from the tupper during the compression process was controlled to 751: 1.
- the superabsorbent resin having a particle size of 150 or less in the superabsorbent resin prepared in Preparation Example 1 was placed in a 1 / 61st container , and the mixture was stirred for 650 minutes. The mixture was stirred for 1 minute, .
- Comparative Example 5 120 parts by weight of water was used and it was confirmed that energy consumption for drying to remove moisture after re-assembly was very high. If such moisture could not be properly removed, it was confirmed that the (crimped) finely divided assembly could not be manufactured properly due to the overload of the apparatus as in Comparative Examples 6 and 7. [ ⁇ Experimental Example>
- the measurement of water holding capacity was based on the TEA ANA method WSP 241.3. 0.2 part of a sample with a particle diameter of 300 [M or more and less than 600m] is put into a tea bag and precipitated in a 0.9% salt aqueous solution for 30 minutes. After dehydration for 3 minutes with a centrifugal force of 250G (gravity), the amount W 2 ( g) of saline solution absorbed was measured. Also, after the same operation was performed without using the pressurized pulverization assembly, the mass V ⁇ Mg at that time was measured.
- W 0 ( g) is the initial weight of the crimp bobbin assembly (not shown,
- W ⁇ g) is the weight of the device after dehydration at 250G for 3 minutes using a centrifuge, without using a crimped fine particle assembly
- W 2 ( g) was compressed at 0.9% by weight in physiological saline at room temperature, This is the weight of the device, including the crimped bonsai assembly, after dipping for 30 minutes and then absorbing and dewatering for 3 minutes at 250 (3) using a centrifuge.
- the absorption rate was measured for the crimped pulverizer assembly.
- the absorption rate measured was 50 (11 1 saline 100 171 1 was placed with a magnetic bar in a beaker. Stirrer using a stirring speed of 600 was assigned by ⁇ 1. To being stirred saline solution into the crimp differential re-assembly of the 2.0 9 The time was measured at the same time. The time instant was terminated at the point when the vortex disappears.
- the pressed compacted assembly according to Examples 1 and 2 has an absorption capacity (maintenance performance) equal to or higher than that of Comparative Examples 3 and 5, and an excellent absorption rate Respectively.
- Comparative Example 3 has a disadvantage that the absorption ability is poor and the funny differentiation ratio is large.
- Comparative Example 5 as described above, not only a large energy consumption is caused in the drying process due to a very large water consumption, It was confirmed that the absorption rate was poor.
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
Description
Claims
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP18889940.5A EP3564295B1 (en) | 2018-01-16 | 2018-12-03 | Method for preparing super absorbent polymer |
| US16/478,890 US10894867B2 (en) | 2018-01-16 | 2018-12-03 | Manufacturing method of super absorbent polymer |
| JP2019531815A JP6814885B2 (ja) | 2018-01-16 | 2018-12-03 | 高吸水性樹脂の製造方法 |
| CN201880006698.4A CN110278712B (zh) | 2018-01-16 | 2018-12-03 | 超吸收性聚合物的制造方法 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020180005708A KR102555379B1 (ko) | 2018-01-16 | 2018-01-16 | 고흡수성 수지의 제조 방법 |
| KR10-2018-0005708 | 2018-01-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2019143017A1 true WO2019143017A1 (ko) | 2019-07-25 |
| WO2019143017A9 WO2019143017A9 (ko) | 2020-01-16 |
Family
ID=67301061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2018/015191 Ceased WO2019143017A1 (ko) | 2018-01-16 | 2018-12-03 | 고흡수성 수지의 제조 방법 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US10894867B2 (ko) |
| EP (1) | EP3564295B1 (ko) |
| JP (1) | JP6814885B2 (ko) |
| KR (1) | KR102555379B1 (ko) |
| CN (1) | CN110278712B (ko) |
| WO (1) | WO2019143017A1 (ko) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021131898A1 (ja) * | 2019-12-24 | 2021-07-01 | 住友精化株式会社 | 吸水性樹脂粒子の製造方法及び重合体粒子の製造方法 |
| CN114222787A (zh) * | 2019-10-08 | 2022-03-22 | 株式会社Lg化学 | 用于制备超吸收性聚合物的方法 |
| JP2022542597A (ja) * | 2019-10-08 | 2022-10-05 | エルジー・ケム・リミテッド | 高吸水性樹脂の製造方法 |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021235524A1 (ja) * | 2020-05-21 | 2021-11-25 | 住友精化株式会社 | 吸水性樹脂粒子を製造する方法 |
| WO2022025003A1 (ja) * | 2020-07-28 | 2022-02-03 | 住友精化株式会社 | 吸水性樹脂粒子及び吸水性樹脂粒子を製造する方法 |
| JP7427319B2 (ja) * | 2020-12-24 | 2024-02-05 | エルジー・ケム・リミテッド | 高吸水性樹脂の製造方法 |
| US12383885B2 (en) | 2023-11-24 | 2025-08-12 | Lg Chem, Ltd. | Super absorbent polymer |
| KR20250152994A (ko) | 2024-04-17 | 2025-10-24 | 주식회사 엘지화학 | 고흡수성 수지 |
| US12533656B2 (en) | 2024-05-02 | 2026-01-27 | Lg Chem, Ltd. | Super absorbent polymer |
| US12605694B2 (en) | 2024-05-03 | 2026-04-21 | Lg Chem, Ltd. | Super absorbent polymer |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100269980B1 (ko) * | 1994-10-26 | 2000-10-16 | 다나카 쇼소 | 흡수성수지조성물및그제조방법 |
| KR20140145810A (ko) * | 2013-06-14 | 2014-12-24 | 주식회사 엘지화학 | 고흡수성 수지의 제조 방법 |
| WO2015163519A1 (en) * | 2014-04-25 | 2015-10-29 | Songwon Industrial Co., Ltd. | Recycling of fine particles in the production of water-absorbent polymer particles |
| KR20170007094A (ko) * | 2015-07-10 | 2017-01-18 | 주식회사 엘지화학 | 고흡수성 수지의 제조 방법 및 이로부터 제조된 고흡수성 수지 |
| KR20170052480A (ko) * | 2015-11-03 | 2017-05-12 | 주식회사 엘지화학 | 고흡수성 수지의 제조 방법 |
| KR20170106154A (ko) * | 2016-03-11 | 2017-09-20 | 주식회사 엘지화학 | 고흡수성 수지의 제조 방법, 및 고흡수성 수지 |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4950692A (en) | 1988-12-19 | 1990-08-21 | Nalco Chemical Company | Method for reconstituting superabsorbent polymer fines |
| US5064582A (en) | 1989-09-15 | 1991-11-12 | The Dow Chemical Company | Process and apparatus for recycling aqueous fluid absorbents fines |
| TW241279B (ko) * | 1991-02-01 | 1995-02-21 | Catalyst co ltd | |
| EP0759460B2 (en) * | 1995-03-09 | 2012-03-21 | Nippon Shokubai Co., Ltd. | Blood-absorbent resin composition and absorbent articles |
| EP0844270B1 (en) | 1996-11-20 | 2004-11-17 | Sanyo Chemical Industries, Ltd. | Water absorbing agent and method of producing the same |
| JP3135878B2 (ja) | 1996-11-20 | 2001-02-19 | 三洋化成工業株式会社 | 吸水剤およびその製造方法 |
| JP2000189794A (ja) | 1998-12-28 | 2000-07-11 | Nippon Shokubai Co Ltd | 吸水材の製造方法 |
| JP4132592B2 (ja) | 1999-06-25 | 2008-08-13 | 株式会社日本触媒 | 吸水性樹脂およびその製造方法 |
| JP4224899B2 (ja) | 1999-08-20 | 2009-02-18 | ダイヤニトリックス株式会社 | ゲル状体の押出機およびゲル状体の造粒方法 |
| DE10161496A1 (de) | 2001-12-14 | 2003-06-26 | Stockhausen Chem Fab Gmbh | Kompaktierte absorbierende Polymere, deren Herstellung und Verwendung |
| BE1016025A3 (fr) | 2003-06-03 | 2006-01-10 | Nippon Catalytic Chem Ind | Procede de preparation d'un materiau absorbant l'eau. |
| CN102822209B (zh) | 2010-04-07 | 2014-09-03 | 株式会社日本触媒 | 聚丙烯酸(盐)系吸水性树脂粉末的制造方法、聚丙烯酸(盐)系吸水性树脂粉末 |
| KR101422674B1 (ko) * | 2012-07-25 | 2014-07-23 | 조선대학교산학협력단 | 치과교정용 듀얼 슬롯 브라켓 어셈블리 |
| KR101700907B1 (ko) | 2013-12-10 | 2017-01-31 | 주식회사 엘지화학 | 고흡수성 수지의 제조 방법 |
| KR102082027B1 (ko) | 2014-05-13 | 2020-02-27 | 주식회사 윌러스표준기술연구소 | 클리어 채널 할당을 위한 무선 통신 방법 및 이를 이용한 무선 통신 단말 |
| KR101949454B1 (ko) | 2015-06-15 | 2019-02-18 | 주식회사 엘지화학 | 고흡수성 수지 |
-
2018
- 2018-01-16 KR KR1020180005708A patent/KR102555379B1/ko active Active
- 2018-12-03 EP EP18889940.5A patent/EP3564295B1/en active Active
- 2018-12-03 WO PCT/KR2018/015191 patent/WO2019143017A1/ko not_active Ceased
- 2018-12-03 US US16/478,890 patent/US10894867B2/en active Active
- 2018-12-03 CN CN201880006698.4A patent/CN110278712B/zh active Active
- 2018-12-03 JP JP2019531815A patent/JP6814885B2/ja active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100269980B1 (ko) * | 1994-10-26 | 2000-10-16 | 다나카 쇼소 | 흡수성수지조성물및그제조방법 |
| KR20140145810A (ko) * | 2013-06-14 | 2014-12-24 | 주식회사 엘지화학 | 고흡수성 수지의 제조 방법 |
| WO2015163519A1 (en) * | 2014-04-25 | 2015-10-29 | Songwon Industrial Co., Ltd. | Recycling of fine particles in the production of water-absorbent polymer particles |
| KR20170007094A (ko) * | 2015-07-10 | 2017-01-18 | 주식회사 엘지화학 | 고흡수성 수지의 제조 방법 및 이로부터 제조된 고흡수성 수지 |
| KR20170052480A (ko) * | 2015-11-03 | 2017-05-12 | 주식회사 엘지화학 | 고흡수성 수지의 제조 방법 |
| KR20170106154A (ko) * | 2016-03-11 | 2017-09-20 | 주식회사 엘지화학 | 고흡수성 수지의 제조 방법, 및 고흡수성 수지 |
Non-Patent Citations (2)
| Title |
|---|
| ODIAN: "Principle of Polymerization", 1981, WILEY, pages: 203 |
| See also references of EP3564295A4 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114222787A (zh) * | 2019-10-08 | 2022-03-22 | 株式会社Lg化学 | 用于制备超吸收性聚合物的方法 |
| JP2022542597A (ja) * | 2019-10-08 | 2022-10-05 | エルジー・ケム・リミテッド | 高吸水性樹脂の製造方法 |
| CN114222787B (zh) * | 2019-10-08 | 2023-09-01 | 株式会社Lg化学 | 用于制备超吸收性聚合物的方法 |
| JP7337417B2 (ja) | 2019-10-08 | 2023-09-04 | エルジー・ケム・リミテッド | 高吸水性樹脂の製造方法 |
| US12338331B2 (en) | 2019-10-08 | 2025-06-24 | Lg Chem, Ltd. | Method for preparing superabsorbent polymer |
| WO2021131898A1 (ja) * | 2019-12-24 | 2021-07-01 | 住友精化株式会社 | 吸水性樹脂粒子の製造方法及び重合体粒子の製造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019143017A9 (ko) | 2020-01-16 |
| KR102555379B1 (ko) | 2023-07-12 |
| EP3564295B1 (en) | 2026-04-15 |
| JP6814885B2 (ja) | 2021-01-20 |
| CN110278712B (zh) | 2022-02-25 |
| US20200247958A1 (en) | 2020-08-06 |
| EP3564295A1 (en) | 2019-11-06 |
| CN110278712A (zh) | 2019-09-24 |
| US10894867B2 (en) | 2021-01-19 |
| EP3564295A4 (en) | 2020-03-25 |
| JP2020507635A (ja) | 2020-03-12 |
| KR20190087209A (ko) | 2019-07-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2019143017A1 (ko) | 고흡수성 수지의 제조 방법 | |
| KR101559081B1 (ko) | 고흡수성 수지의 제조 방법 및 이로부터 제조되는 고흡수성 수지 | |
| JP5320305B2 (ja) | 吸水性樹脂の結着方法 | |
| KR101949994B1 (ko) | 고흡수성 수지 조립체 및 이의 제조 방법 | |
| KR101632058B1 (ko) | 고흡수성 수지의 제조 방법 | |
| JP4460851B2 (ja) | 吸水性樹脂の整粒方法 | |
| KR101960043B1 (ko) | 고흡수성 수지의 제조 방법 | |
| CN105492466B (zh) | 制备超吸收性聚合物的方法 | |
| CN108137725B (zh) | 超吸收性聚合物的制造方法和超吸收性聚合物 | |
| KR20190076715A (ko) | 고흡수성 수지의 제조 방법 | |
| KR20190115661A (ko) | 고흡수성 수지의 제조방법 | |
| CN105793293B (zh) | 超吸收性聚合物及其制造方法 | |
| EP3722352B1 (en) | Method of preparing superabsorbent polymer and superabsorbent polymer | |
| KR20190003351A (ko) | 고흡수성 수지의 제조 방법 및 이러한 방법으로 얻은 고흡수성 수지 | |
| KR102513452B1 (ko) | 고흡수성 수지의 제조방법 | |
| CN114222787B (zh) | 用于制备超吸收性聚合物的方法 | |
| CN112789322B9 (zh) | 超吸收性聚合物的制备方法 | |
| JP7337417B2 (ja) | 高吸水性樹脂の製造方法 | |
| WO2018135928A9 (ko) | 고흡수성 수지 및 이의 제조 방법 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ENP | Entry into the national phase |
Ref document number: 2019531815 Country of ref document: JP Kind code of ref document: A |
|
| ENP | Entry into the national phase |
Ref document number: 2018889940 Country of ref document: EP Effective date: 20190725 |
|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 18889940 Country of ref document: EP Kind code of ref document: A1 |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| WWG | Wipo information: grant in national office |
Ref document number: 2018889940 Country of ref document: EP |
