WO2000010619A1 - Superabsorbent polymers having anti-caking characteristics - Google Patents
Superabsorbent polymers having anti-caking characteristics Download PDFInfo
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- WO2000010619A1 WO2000010619A1 PCT/IB1999/001587 IB9901587W WO0010619A1 WO 2000010619 A1 WO2000010619 A1 WO 2000010619A1 IB 9901587 W IB9901587 W IB 9901587W WO 0010619 A1 WO0010619 A1 WO 0010619A1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
- C08L101/12—Compositions of unspecified macromolecular compounds characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity
- C08L101/14—Compositions of unspecified macromolecular compounds characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity the macromolecular compounds being water soluble or water swellable, e.g. aqueous gels
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/18—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing inorganic materials
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/42—Use of materials characterised by their function or physical properties
- A61L15/60—Liquid-swellable gel-forming materials, e.g. super-absorbents
-
- 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
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/205—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase
- C08J3/21—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase the polymer being premixed with a liquid phase
- C08J3/212—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase the polymer being premixed with a liquid phase and solid additives
-
- 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
Definitions
- the present invention relates, in general, to polymers that absorb
- aqueous liquids such as water, blood, and urine. More particularly, the present invention relates to superabsorbent polymers, namely polymers that absorb over 20 times their weight in water, which superabsorbent polymers have unique anti-caking characteristics from admixing with a fine inorganic powder. As is well known, since superabsorbent polymers readily absorb
- the polymer particles will, during storage or during shipment to an end- use manufacturer (for instance, a manufacturer of absorbent sanitary articles,
- the superabsorbent polymer compositions of the present invention obviate this
- SAP superabsorbent polymer a polymer that absorbs over 20 times its weight in water
- SAPs namely highly water-swellable polymers
- SAPs typically are prepared by solvent or solution polymerization of an aqueous mixture of monomers.
- one or more X-linking agents are incorporated into the monomer mixture.
- the resultant is dried and
- SAPs are useful in various absorbent articles, due to
- SAPs the ability of the SAPs to absorb bodily liquids in a ready manner.
- SAPs also absorb water from the air, and when exposed to humid environments, tend to agglomerate together into a large mass, i.e., to cake.
- the particles are difficult to incorporate into absorbent articles because the
- the particles tend to stick to each other and to the manufacturing equipment, such as screens, driers, and fabricating machinery. Thus, production must be periodically stopped so that the
- the particles have already absorbed some water and agglomerated, then the water-swelling capacity of the end use absorbent article will be decreased.
- Kagaku Kogyo shows mixing 0.01 to 10 parts by weight of finely divided silica with 100 parts by weight of superabsorbent polymer. Also, WO 94/22940
- absorbent end use article that includes very small SAP particles (at least 70% by weight will pass through a U.S. Standard 50 mesh sieve which has openings of 300 ⁇ m in size) that are formed by solution polymerization and that are
- silica occurs naturally as quartz
- SAPs are made by two methods, namely the solvent or solution polymerization method and the inverse suspension or
- X-linking agent is converted to a gel by radical polymerization.
- the resultant is dried, ground, and screened to the desired particulate size.
- an aqueous solution for instance of partially neutralized acrylic acid, is dispersed in a hydrophobic organic solvent by employing colloids or emulsifiers, and polymerization is started by radical initiators.
- Water is
- Network X-linking may be accomplished by dissolving a polyfunctional X-linking agent
- the present invention provides a particulate material composition comprising an inorganic powder intermixed with particles of
- the polymer particles are of such size that less than
- particulate material composition exhibits excellent anti-caking characteristics, as measured by the anti-caking property test as defined below.
- the present invention provides a method for providing anti-caking
- the method comprises (A) providing SAP particles of such size that less than about 60% of the polymer particles, by weight, will pass through a U.S. Standard 50 mesh sieve with 300 micrometer
- micrometer openings after at least about 3 hours at about 36 ⁇ 3 °C and about
- the present invention provides an absorbent article
- the particulate material composition comprises an inorganic powder intermixed with particles of
- the present invention provides a method for providing anti-
- the method comprises (A) providing SAP particles of such size that less than about 60% of the polymer particles, by weight, will pass through a
- composition particles by weight, will pass through a U.S. Standard 12 mesh sieve with 1700 micrometer openings after at least about 3 hours at about 36 ⁇ 3°C and about 77 ⁇ 3% RH, and (D) forming an absorbent
- absorbent article in step (D) may be achieved by mixing the particulate material
- composition with a fibrous component to make a core composite, and then, using the core composite to make the absorbent article.
- the particulate material composition can be stored and shipped, even in hot, humid locations, such as the southern part of the United States in the summertime, or tropical
- the particulate material composition can obviate caking problems, yet employ SAP particles
- a mixture of SAP particles and inorganic powder is referred to as a
- the particulate material composition comprises particles of SAP material intermixed with small amounts of inorganic powder.
- the particles of SAP are generally of typical, regular PSD, by which is meant that less than about 60% by weight of the
- U.S. Standard 50 mesh sieve and more preferably, less than about 40% by weight will pass through a U.S. Standard 50 mesh sieve, and even more preferably, less than about 30% by weight will pass through a U.S. Standard
- the SAPs according to the present invention may be manufactured on
- the particulate SAP of use in the present invention may be manufactured by any of the prior art processes for making SAPs.
- the SAP may be
- the SAP may be obtained by polymerizing at least about 25%, more preferably about 55 to about 99.9% by weight of monomers having
- groups include, but are not limited to, acrylic acids, methacrylic acids, 2-
- acrylamido-2-methylpropane sulfonic acid and mixtures thereof.
- the acid groups are present as salts, such as sodium, potassium, or ammonium salts.
- the acid groups are typically neutralized to at least about 25 mol %.
- the extent of neutralization is to at least about 50 mol %. More
- the preferred SAP has been formed from X-linked acrylic acid or methacrylic acid, which has been neutralized to an extent of about 50 to about 80 mol %.
- Suitable neutralizing agents are hydroxides and/or carbonates of
- alkaline earth metals and/or alkali metals for instance, NaOH.
- Additional useful monomers for making the SAPs include from above 0 up to about 40% by weight of acrylamide, methacrylamide, maleic acid, maleic anhydride, esters (such as hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, and dimethyl-aminoalkyl-methacrylate), dimethyl- aminopropyl acrylamide, and acrylamidopropyl trimethylammonium chloride. Percentages below about 40% of these monomers are desirable as
- a preferred amount is from about 1% to about 25% by weight, and more preferably from about 2% to about 10% by weight.
- Suitable network X-linking agents useful in making the SAPs are those
- Suitable kinds of network X-linking agents include, but are not limited to, acrylate and
- polyols such as butanediol diacrylate, hexanediol
- dimethacrylate polyglycol diacrylate, trimethylolpropane triacrylate, allyloxy polyethylene glycol methacrylate, and ethoxylated trimethylolpropane triacrylate
- allyl acrylate diallyl acrylamide, triallyl amine, diallyl ether, methylenebisacrylamide, glycerol dimethacrylate, N-methylol methacrylamide,
- multi-functional include, but are not limited to, alcohols, amines, and epoxides, such as glycol, propylene glycol, glycerol, ethylene diamine, hexamethylene diamine, glycerol polygiycidal ether, and resorcinol diglycidal ether.
- alcohols such as glycol, propylene glycol, glycerol, ethylene diamine, hexamethylene diamine, glycerol polygiycidal ether, and resorcinol diglycidal ether.
- epoxides such as glycol, propylene glycol, glycerol, ethylene diamine, hexamethylene diamine, glycerol polygiycidal ether, and resorcinol diglycidal ether.
- the SAP may have a water-soluble polymeric component.
- the content may range from above 0 up to about 30% by weight of a component that includes, but is not limited to,
- polyvinyl alcohol partially or complete saponified polyvinyl alcohol, polyvinyl pyrrolidone, starch, starch derivatives, polyglycols, polyacrylic acids, and combinations thereof.
- the molecular weight of the component is not critical, provided that it is water- soluble.
- Preferred water-soluble polymeric components are starch, polyvinyl alcohol, and mixtures thereof.
- the content of the water-soluble polymeric component in the SAP ranges from about 1 to about 5% by weight,
- the water-soluble polymeric component may be present as a graft polymer having the acid-groups-containing polymer.
- the SAP may be the dried resultant obtained either by inverse or suspension polymerization, or by solvent or solution polymerization.
- particle size distribution ranges between about 20 and about 2000
- micrometers preferably between about 40 and about 890 micrometers, and more preferably between about 90 and about 850 micrometers.
- the SAPs of the present invention may be optionally coated with a surface X-linking agent, such as a diol, a diamine, a diepoxide, or an alkylene carbonate, followed by heating to effect surface X-linking.
- a surface X-linking agent such as a diol, a diamine, a diepoxide, or an alkylene carbonate
- portion of the SAP particles preferably is surface X-linked.
- the polymer in orderto coat the particulate SAP with a surface X-linking agent, may be mixed with an aqueous-alcoholic solution of the alkylene carbonate surface X- linking agent.
- alkylene carbonates e.g., 1 ,3-
- dioxolan-2-one 4-methyl-1 ,3-dioxolan-2-one, 4,5-dimethyl-1 ,3-dioxolan-2-one, 4,4-dimethyl-1 ,3-dioxolan-2-one, 4-ethyl-1 ,3-dioxolan-2-one, 4-hydroxyethyl-
- alkylene carbonates are 1 ,3-dioxolan-2-one and 4-methyl-1 ,3- dioxolan-2-one.
- the amount of alcohol is determined by the solubility of the alkylene carbonate and is kept as low as possible for technical reasons, for
- Suitable alcohols are methanol,
- the alkylene carbonate surface X-linking agent is dissolved in water, without any alcohol.
- alkylene carbonate surface X-iinking agent from a powder mixture, for example, with an inorganic carrier material, such as SiO 2 ,
- the surface X-linking agent has to be distributed evenly on the particulate SAP.
- mixing is effected in suitable mixers, such as fluidized bed mixers, paddle mixers, milling roils, or twin-worm-mixers. It is also possible to carry out the
- An especially suitable process for this purpose is the inverse suspension polymerization process.
- the coating treatment is carried out as follows.
- the thermal treatment is at a temperature between 150 and 300°C. However, if the
- the thermal treatment is at a temperature between 180 and 250°C.
- the treatment temperature depends on the dwell time and the kind of alkylene carbonate.
- the thermal treatment is carried out for several hours.
- the thermal treatment is carried out at a temperature of 150°C.
- the thermal treatment may
- dryers and ovens include rotary kilns, fluidized bed dryers, disk dryers, or infrared dryers.
- the fine inorganic powder useful in the present invention may comprise
- any of the clays i.e., hydrated aluminum silicates, generally of the formula
- Suitable clays are kaolin clays, such as those sold by Dry
- NeoGen DGH (median particle size of 0.6 ⁇ m) and NeoGen 2000 (median particle size of 0.7 ⁇ m).
- the average size of the particles of the inorganic powder is preferably
- the size of the particles of the inorganic powder can be measured by any accurate and reliable means.
- the inorganic powder is preferably mixed with the SAP particles in an
- this is an amount of between about 0.2% to about 10%, more preferably about 0.5% to about 7%, and even more preferably about 0.9% to about 5.5% (i.e., between
- the inorganic powder may be mixed with the particles of SAP in a substantially dry state, or with the addition of a liquid such as water, in amounts typically of up to about 10 parts by weight of the liquid to 100 parts by
- the inorganic powder and the particles of SAP can be intermixed in any combination
- Suitable manners include, but are not limited to, physical intermixing employing the above-described mixers that are employed for the optional surface X-linking agent.
- the inorganic powder may be mixed with the precursor SAP particles prior to mixing and heating with the surface X-linking agent, or (2) the
- precursor SAP particles may be mixed and heated with the surface X-linking agent followed by mixing with the inorganic powder.
- inventive particulate material compositions (of the SAP particles and the inorganic powder) may be employed for any traditional use for which SAPs are employed.
- such uses include, but are not limited to, use in
- an absorbent article such as a sanitary article (i.e., diapers, incontinence
- STOCKOSORB® which is a SAP marketed by Stockhausen for use in agricultural fields to improve the capability of soils to keep water and nutrients near or with the roots of plants.
- the present invention obviates the well known problem that when very small particles of SAP swell upon contact with liquids, the particles, when incorporated with fiber, tend to be easily forced into the interfiber
- the small swollen particles form a mass of coagulated gel held together by fluid surface tension-forces, thus forming a gel barrier, and
- compositions of the present invention as well as those comparison compositions
- CRC centrifuge retention capacity
- AUL absorbency under load
- dust rating the dust rating
- anti-caking characteristics the acquisition time
- CRC Retention after an immersion time of 30 minutes (g of liquid absorbed/g of composition of inorganic powder and
- W 2 Weight of the average blank tea bags (without composition of inorganic powder and SAP) after
- W 3 Weight of the tea bag with composition of inorganic powder and SAP after centhfugation (g)
- the fritted disc After allowing the fritted disc to soak in the NaCI solution for a minimum of 1 hour just prior to test use, the fritted disc was placed in the petri dish.
- the cylinder was tared on the analytical balance.
- An initial weight of 0.160 ⁇ 0.005 g of the composition of inorganic powder and SAP was
- composition sample actual weight was recorded (SA).
- the plastic spacer and then the stainless steel weight were carefully placed into the cylinder.
- the weight of the completed AUL apparatus was recorded (A).
- the stainless steel weight exerted a pressure load of 60 g/cm 2 .
- AUL is in g/g at 0.9 psi; the resultant AUL value should be rounded to
- absorbing NaCI solution B is weight in g of AUL apparatus with composition after absorbing
- NaCI solution for 1 hour SA is actual weight in g of composition
- weighed was a 149.9 g portion of the mixture from the sieves, which was placed in another French Square bottle. Then, 0.1 g of the fines from the catch pan was weighed and added to the bottle, followed by mixing. The bottle was then sealed and labeled.
- the technician then recorded the number (dusting standard no. 1 , 2, 3, or 4) that the technician subjectively believed was most comparable to the sample, with a rating of 4 being the most dusty and a rating of 1 being the least
- the anti-caking characteristics of the particulate material compositions were determined by the following abbreviations:
- test procedure allows
- Samples of the various particulate material compositions were subjected to a temperature and relative humidity for the anti-caking tests of 36 ⁇ 3°C and 77 ⁇ 3 % RH, for 4 respective time periods of 3, 6, 15, and 24 hours, each ⁇
- the temperature and RH were maintained by placing samples inside a controlled climate environmental chamber sold under catalog no. 700 ADH FTX, serial no.493-001 by Lab-Line Instruments of Melrose Park, Illinois. The high temperature and high RH simulate ambient conditions for locations
- Respective plastic dishes each of approximately 60 mm in diameter, were each weighed precisely on a tared balance accurate to 0.10 g. This weight was recorded as the cup weight.
- particulate material composition was spread evenly in each respective plastic dish.
- Each respective dish with a sample was then placed in the chamber at the specified temperature and RH, for the particular exposure time.
- the resultant anti-caking % should be rounded to 2 significant figures, unless, of course, the sample passes by 100%.
- a sample of a particulate material composition is about 70% or higher, more preferably about 85% or higher, even more preferably about 90% or higher, and most preferably about 95% or higher.
- the sample is considered as having moderate anti- caking properties, if it passed the test conditions for 6 hours, but not the 15 and 24 hour time periods. If a sample passed the test conditions for 15 hours, but not for 24 hours, the sample is considered as having heavy anti-caking
- the acquisition time is the time between the addition of liquid and its
- each core was weighed and placed on a body-shaped test apparatus, and subjected to a load of 12.5 kg. An insult amount of 100 ml of 0.9% saline was added to the surface of each core.
- the rewet is the amount of liquid release onto filter paper from the surface of each respective core under a predetermined pressure.
- each core was taken off the test apparatus, placed on the counter top, and fastened down with tape. Then, 3 pre-weighed stacks of filter paper (40 g each) and 3 weights (1270 g each) were placed on each core for 10 minutes. At the end of the specified 10 minute time, the filter paper stacks
- resultant rewet value should be rounded to the tenths place.
- AP-88 is a network X-linked sodium polyacrylate made by solvent polymerization from an aqueous acrylic acid solution including 2 network X-linking agents.
- AP-88 has a neutralization degree of 70 mol %.
- the particulate precursor SAP was screened to 95 to 850 micrometers, and then, 200 grams were mixed with 2 grams of powdery kaolin (NeoGen 2000) in a Bausch bread kneader for 5 minutes at speed 3. An aqueous solution containing 20% by weight of ethylene carbonate (surface X-linking agent) was then added by spraying. The ethylene carbonate was calculated to be 0.5% by weight based on dry SAP. The mixture was heated in an oven at 190°C for 35 minutes, cooled, and screened to a PSD ranging from about
- material composition (of AP-88 and kaolin) were of such a size that less than 40% passed through a U.S. Standard 50 mesh sieve (300 ⁇ m size openings).
- the particulate precursor SAP according to Example 1 was mixed with
- Example 3 kaolin and surface X-linked in the same manner as in Example 1 , except that 6 grams of powdery kaolin (NeoGen 2000) were used.
- Example 3
- the particulate precursor SAP according to Example 1 was mixed with kaolin and surface X-linked in the same manner as in Example 1 , except that
- the particulate precursor SAP according to Example 1 was mixed with
- Example 2 kaolin and surface X-linked in the same manner as in Example 1 , except that 4 grams of powdery kaolin (NeoGen DGH) were used.
- the particulate precursor SAP according to Example 1 was mixed with an aqueous slurry containing 6.25% by weight of ethylene carbonate (surface
- the particulate precursor SAP according to Example 1 was mixed with
- Example 6 Example 6 was cooled, and then blended with a 50% solution of kaolin to give a 50% solution of kaolin to
- the resultant particulate material composition (of AP-88 and kaolin)
- the particulate AP-88 was mixed with an aqueous slurry of kaolin using an atomized spraying system (Nordson Pump/Airless Gun®, Model 25B with
- the final kaolin (NeoGen DGH) concentration was 2.5% based on dry AP-88.
- the final particulate material composition was sieved to a PSD ranging from about 150 to 850 micrometers.
- compositions of inorganic kaolin clay powder and SAP (having the % indicated below as passing through a U.S. Standard 50 mesh sieve) were tested for CRC, AUL, anti-caking, and dust rating.
- Example 6 procedure of Example 6 was repeated to make a composition of kaolin and SAP, except that the sample of SAP was selected such that it had the PSD
- the resultant anti-caking performance was unsatisfactory and far below both the desirable about 85% or higher and the preferred about 90% or higher for the moderate anti-caking property (6 hour
- caking property 24 hour test
- all Comparisons were below the preferred about 90% or higher for the light anti-caking property (3 hour test) for the particulate material compositions of kaolin + SAP in
- Example 15 and Comparison Example 16 Carbon of SAP and Cellulosic Fluff
- inventive particulate material composition (of 2.5% NeoGen DGH kaolin and AP-88 SAP) made as described above in Example 8 and also AP-88
- each core was 0.084 g/cm2, and each had
- composition (NeoGen DGH + AP-88) to fiber ratio, or an AP-88 to fiber ratio,
- such cores are useful in absorbent articles, such as sanitary napkins or disposable diapers.
- Each absorbent core was then tested with 0.9% by weight aqueous saline for performance results of acquisition time and multiple rewet.
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT99943177T ATE220563T1 (en) | 1998-08-18 | 1999-08-18 | NON-CLUGGING SUPERABSORBENT POLYMERS |
KR20017002041A KR100614787B1 (en) | 1998-08-18 | 1999-08-18 | Superabsorbent polymer with anti-caking properties |
DE69902177T DE69902177T2 (en) | 1998-08-18 | 1999-08-18 | NON-CLUMPING SUPER ABSORBENT POLYMERS |
EP99943177A EP1105168B1 (en) | 1998-08-18 | 1999-08-18 | Superabsorbent polymers having anti-caking characteristics |
BR9913689-9A BR9913689A (en) | 1998-08-18 | 1999-08-18 | Superabsorbent polymers having anti-caking characteristics |
AU56446/99A AU751965B2 (en) | 1998-08-18 | 1999-08-18 | Superabsorbent polymers having anti-caking characteristics |
JP2000565938A JP4414097B2 (en) | 1998-08-18 | 1999-08-18 | Superabsorbent polymer with anti-caking properties |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/135,844 | 1998-08-18 | ||
US09/135,844 US6124391A (en) | 1998-08-18 | 1998-08-18 | Superabsorbent polymers having anti-caking characteristics |
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WO2000010619A1 true WO2000010619A1 (en) | 2000-03-02 |
Family
ID=22469972
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Application Number | Title | Priority Date | Filing Date |
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PCT/IB1999/001587 WO2000010619A1 (en) | 1998-08-18 | 1999-08-18 | Superabsorbent polymers having anti-caking characteristics |
Country Status (11)
Country | Link |
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US (1) | US6124391A (en) |
EP (1) | EP1105168B1 (en) |
JP (1) | JP4414097B2 (en) |
KR (1) | KR100614787B1 (en) |
CN (1) | CN1222325C (en) |
AT (1) | ATE220563T1 (en) |
AU (1) | AU751965B2 (en) |
BR (1) | BR9913689A (en) |
DE (1) | DE69902177T2 (en) |
MX (1) | MXPA01001770A (en) |
WO (1) | WO2000010619A1 (en) |
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WO2002034384A2 (en) * | 2000-10-25 | 2002-05-02 | Stockhausen Gmbh & Co. Kg | Absorption agents with a high swelling capacity, with a reduced tendency to cake |
EP1275669A1 (en) | 2000-04-13 | 2003-01-15 | SANYO CHEMICAL INDUSTRIES, Ltd. | Crosslinked polymer, process for producing the same, absorbent structure, and absorbent article |
WO2005011860A2 (en) * | 2003-07-25 | 2005-02-10 | Stockhausen Gmbh | Powdery, water-absorbent polymers comprising fine particles bonded by means of thermoplastic adhesives |
WO2010046265A1 (en) * | 2008-10-20 | 2010-04-29 | Evonik Stockhausen Inc. | Superabsorbent polymer containing clay, particulate, and method of making same |
WO2011040472A1 (en) | 2009-09-29 | 2011-04-07 | 株式会社日本触媒 | Particulate water absorbent and process for production thereof |
US8247640B2 (en) | 2000-10-25 | 2012-08-21 | Evonik Stockhausen Gmbh | Highly swellable absorption medium with reduced caking tendency |
US8252715B2 (en) | 2007-03-05 | 2012-08-28 | Nippon Shokubai Co., Ltd. | Water-absorbing agent and production method thereof |
US8309654B2 (en) | 2003-09-05 | 2012-11-13 | Nippon Shokubai Co., Ltd. | Method of producing particle-shape water-absorbing resin material |
US8633285B2 (en) | 2007-12-17 | 2014-01-21 | Basf Se | Method for producing water-absorbing polymer particles |
WO2014054656A1 (en) | 2012-10-01 | 2014-04-10 | 株式会社日本触媒 | Dust-reducing agent comprising multiple metal compound, water absorbent containing multiple metal compound and method for manufacturing same |
US8901368B2 (en) | 2007-12-07 | 2014-12-02 | Sca Hygiene Products Ab | Absorbent core comprising multiple sublayers |
US9062140B2 (en) | 2005-04-07 | 2015-06-23 | Nippon Shokubai Co., Ltd. | Polyacrylic acid (salt) water-absorbent resin, production process thereof, and acrylic acid used in polymerization for production of water-absorbent resin |
US9090718B2 (en) | 2006-03-24 | 2015-07-28 | Nippon Shokubai Co., Ltd. | Water-absorbing resin and method for manufacturing the same |
KR20160127742A (en) | 2014-02-28 | 2016-11-04 | 가부시키가이샤 닛폰 쇼쿠바이 | Poly(meth)acrylic acid (salt)-based particulate absorbent, and production method |
KR20160140659A (en) | 2014-03-31 | 2016-12-07 | 가부시키가이샤 닛폰 쇼쿠바이 | Particulate water absorbent and method for producing same |
US9926449B2 (en) | 2005-12-22 | 2018-03-27 | Nippon Shokubai Co., Ltd. | Water-absorbent resin composition, method of manufacturing the same, and absorbent article |
EP3381970A1 (en) * | 2017-03-31 | 2018-10-03 | Formosa Plastics Corporation | Superabsorbent polymer and the method of fabricating the same |
EP1838463B2 (en) † | 2005-01-13 | 2019-08-14 | Basf Se | Method for grading a particulate water-absorbing resin |
US10829630B2 (en) | 2016-03-11 | 2020-11-10 | Lg Chem, Ltd. | Super absorbent polymer |
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Also Published As
Publication number | Publication date |
---|---|
US6124391A (en) | 2000-09-26 |
BR9913689A (en) | 2001-06-05 |
DE69902177T2 (en) | 2003-03-13 |
JP2002523526A (en) | 2002-07-30 |
JP4414097B2 (en) | 2010-02-10 |
ATE220563T1 (en) | 2002-08-15 |
KR20010072728A (en) | 2001-07-31 |
AU5644699A (en) | 2000-03-14 |
EP1105168B1 (en) | 2002-07-17 |
CN1222325C (en) | 2005-10-12 |
DE69902177D1 (en) | 2002-08-22 |
AU751965B2 (en) | 2002-09-05 |
KR100614787B1 (en) | 2006-08-25 |
MXPA01001770A (en) | 2001-08-31 |
EP1105168A1 (en) | 2001-06-13 |
CN1323227A (en) | 2001-11-21 |
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