WO2003059961A1 - Procede de prevention de la coloration d'une resine absorbant l'eau - Google Patents

Procede de prevention de la coloration d'une resine absorbant l'eau Download PDF

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Publication number
WO2003059961A1
WO2003059961A1 PCT/JP2002/013768 JP0213768W WO03059961A1 WO 2003059961 A1 WO2003059961 A1 WO 2003059961A1 JP 0213768 W JP0213768 W JP 0213768W WO 03059961 A1 WO03059961 A1 WO 03059961A1
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Prior art keywords
water
acid
absorbent resin
added
chelating agent
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PCT/JP2002/013768
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English (en)
Japanese (ja)
Inventor
Masayoshi Handa
Naoyuki Hashimoto
Yasuhiro Nawata
Masato Fujikake
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Sumitomo Seika Chemicals Co., Ltd.
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Publication of WO2003059961A1 publication Critical patent/WO2003059961A1/fr

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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
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/17—Amines; Quaternary ammonium compounds
    • C08K5/175—Amines; Quaternary ammonium compounds containing COOH-groups; Esters or salts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F6/00—Post-polymerisation treatments

Definitions

  • the present invention relates to a method for preventing coloring of a water-absorbent resin. More specifically, the present invention relates to a method for preventing discoloration of a water-absorbing resin which can be suitably used as a water-absorbing agent for absorbent articles of sanitary materials such as disposable diapers and sanitary napkins. Background art
  • Water-absorbent resins take advantage of the fact that they absorb water-based liquids, for example, body fluids such as human urine, blood, and sweat quickly and in large quantities, and do not release the liquid once absorbed under load. It is widely used as a water-absorbing agent for absorbent articles made of sanitary materials such as disposable diapers and sanitary napkins.
  • the conventional water-absorbent resin has a problem that, if left unattended, it tends to be colored yellow or brown due to external factors such as heat and humidity.
  • the water-absorbent resin in the absorbent article such as a disposable diaper or a sanitary napkin is colored, the commercial value as the absorbent article is significantly reduced. Therefore, it is required that the water-absorbent resin used in the absorbent article does not discolor even when left in a harsh environment of high temperature and high humidity such as in a warehouse in summer.
  • Examples of the water-absorbing resin having an anti-coloring effect include a super-water-absorbing polymer composition obtained by adding an organic phosphoric acid compound or a salt thereof to a super-water-absorbing polymer (JP-A-5-82651), acidic water A water-absorbing agent composition comprising a swellable cross-linked polymer, a basic water-swellable cross-linked polymer, a coloring inhibitor, a di- or anti-oxidant, and a di- or boron compound No. 0-230201), a water-absorbing agent composition comprising a water-absorbing resin and an organic carboxylic acid and Z or a salt thereof (Japanese Patent Application Laid-Open No. 2000-329792) Publication).
  • these compositions have not been able to exert a sufficiently satisfactory effect when left for a long time in a harsh environment of high temperature and high humidity.
  • An object of the present invention is to provide a method for preventing coloring of a water-absorbing resin, which can prevent coloring even when left under high temperature and high humidity for a long period of time.
  • An amino carboxylic acid-based metal chelating agent is added to at least one of the steps in the process for producing a water-absorbent resin containing an unsaturated carboxylic acid as an essential monomer, or in the water-absorbent resin after the production.
  • An amino carboxylic acid-based metal chelating agent is used in at least one of the steps in the process for producing a water-absorbent resin containing an unsaturated carboxylic acid as an essential monomer, or in the water-absorbent resin after the production.
  • a method of using an aminocarboxylic acid-based metal chelating agent for preventing coloring of the obtained water-absorbent resin characterized by adding
  • the method for producing a water-absorbent resin containing an unsaturated carboxylic acid as an essential monomer is included in at least one of the processes or after the production of the water-absorbent resin.
  • the addition of an aminocarboxylic acid-based metal chelating agent has a feature in that coloring of the water-absorbing resin can be suppressed even under high temperature and high humidity.
  • aminocarboxylic acid-based metal chelating agent used in the present invention examples include: Mino diacetic acid, hydroxyethylimino diacetic acid, tri-tri-acetic acid, tri-tri-propionic acid, ethylenediamine tetra-acetic acid, dimethylene triamine penta-acetic acid, triethylene tetramine hexa-acetic acid, trans-l, 2-diaminocyclohexane Tetraacetic acid, N, N-bis (2-hydroxyethyl) glycine, diaminopropanol tetraacetic acid, ethylenediamine dipropionic acid, hydroxyethylenediamine triacetic acid, glyco-leterdiamine tetraacetic acid, diaminopropane tetraacetic acid, N , N, -bis (2-hydroxybenzyl) ethylenediamine mono-N, N-diacetic acid, 1,6-hexamethylenediamine-N,
  • diethylenetriamine pentaacetic acid triethylenetetramine hexaacetic acid, trans-1,2-diaminocyclohexanetetraacetic acid and salts thereof are preferably used from the viewpoint of having a more effective coloring prevention effect.
  • the aminocarboxylic acid-based metal chelating agent may be added by A) a method of adding to an aqueous monomer solution containing an unsaturated carboxylic acid before polymerization, (mouth) a method of adding to an aqueous gel after polymerization, (c) a method of adding to a water-absorbing resin during drying (2) a method in which powder is mixed with the dried water-absorbent resin; and (e) a method in which the powder is added to the water-absorbent resin dispersed in an organic solvent and heated and desolvated, and the like.
  • the aminocarboxylic acid-based metal chelating agent in the water-absorbent resin or on the surface of the water-absorbent resin as simply as possible by a simple method.
  • a water-absorbing resin in which an aminocarboxylic acid-based metal chelating agent is uniformly dispersed in particular, (mouth) a method of adding to a hydrogel after polymerization, (c) a method of adding to a water-absorbing resin during drying, (2) A method of mixing the powder with the dried water-absorbent resin is preferable.
  • the form in which the aminocarboxylic acid-based metal chelating agent is added is not particularly limited, but in order to uniformly disperse the aminocarboxylic acid-based metal chelating agent in the water-absorbing resin, A form in which a liquid or powdery amino carboxylic acid-based metal chelating agent is dissolved in a hydrophilic solvent such as water is added, or a form in which a fine powdered amino carboxylic acid-based metal chelating agent is added in a powder state is preferable. .
  • the particle size of the finely powdered aminocarboxylic acid-based metal chelating agent is not particularly limited. The particle diameter is preferably 100 m or less.
  • the amount of the aminocarboxylic acid-based metal chelating agent used is such that a sufficient anti-coloring effect can be obtained, and an effect commensurate with the amount used can be obtained. 0.001 to 6 parts by weight, preferably 0.006 to 3 parts by weight, more preferably 0.01 to 2 parts by weight, based on 100 parts by weight of the unsaturated carboxylic acid as a body. preferable.
  • the aminocarboxylic acid-based metal chelate is added to at least one of the steps of the process for producing a water-absorbent resin containing an unsaturated carboxylic acid as an essential monomer or to the water-absorbent resin after the production.
  • a method for using an aminocarboxylic acid-based metal chelating agent for preventing coloring of a resulting water-absorbent resin which is characterized by adding a single agent.
  • the water-absorbing resin containing the unsaturated monomeric ruponic acid as an essential monomer produced in the present invention includes a crosslinked product of an acrylate polymer and a crosslinked product of hydrolysis and decomposition of a starch monoacrylate graft copolymer.
  • the acid ester copolymer include a gent product. Among them, a crosslinked product of an acrylate polymer capable of absorbing a large amount of water and capable of retaining the absorbed water in the molecule even when a slight load is applied is preferable.
  • unsaturated ruponic acids examples include acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid and the like. These may be used alone, 2 02 13768
  • the unsaturated carboxylic acid may be partially neutralized with an alkali metal or the like, and among them, acrylic acid, methacrylic acid and salts of these metals such as sodium and potassium are preferably used.
  • the unsaturated carboxylic acid may be copolymerized with another monomer.
  • Other monomers include, for example, (meth) acrylamide [r (meth) acryl J means “acryl J and“ methacryl ”. The same applies hereinafter), N-substituted (meth) acrylamide, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, polyethylene glycol (meth) acrylate, etc.
  • Amino group-containing unsaturated monomers such as vinylsulfonic acid, styrenesulfonic acid, 2- (meth) acrylamide 2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, and salts thereof. Sulfonic acid monomers and the like can be mentioned.
  • the method for polymerizing the water-absorbent resin is not particularly limited, and typical production methods such as a reversed-phase suspension polymerization method and an aqueous solution polymerization method are used.
  • the reverse phase suspension polymerization method is illustrated below.
  • a monomer initiator is dispersed in an organic solvent in the presence of at least one of a surfactant and a polymer protective colloid. By using, polymerization is performed.
  • the concentration of the monomer in the aqueous monomer solution is preferably from 25% by weight to a saturated concentration.
  • the monomer aqueous solution may be added all at once, or may be added separately.
  • organic solvent examples include aliphatic hydrocarbon solvents such as n-pentane, n-hexane, n-heptane, and lignin; cyclopentane, methylcyclopentane, and cyclohexane.
  • Alicyclic hydrocarbon solvents such as hexane and methylcyclohexane; benzene, toluene
  • aromatic hydrocarbon solvents such as chidylene.
  • aromatic hydrocarbon solvents such as chidylene.
  • n-heptane and cyclohexane are preferably used.
  • the amount of the organic solvent to be used is preferably from 50 to 600 parts by weight, more preferably 100 to 600 parts by weight, based on the total amount of the monomers of 100 parts by weight, from the viewpoint of removing the heat of polymerization and easily controlling the polymerization temperature. ⁇ 550 parts by weight is more preferred.
  • surfactant examples include sorbitan fatty acid ester, mono-fatty acid glycerin ester, polyglycerin fatty acid ester, sucrose fatty acid ester, polyoxyethylene hydrogenated castor oil, lauric acid polyoxyethylene hydrogenated castor oil, and (tri) polyisoxtearate
  • nonionic surfactants such as tylene-hardened castor oil, polyoxetylene alkylphenyl ether, polyoxyethylene lauryl ether, and polyoxyethylene hexyldecyl ether.
  • polymer protective colloid examples include ethyl cellulose, hydroxyethyl cellulose, oxidized polyethylene, anhydrous maleated polyethylene, anhydrous maleated polybutadiene, anhydrous maleinated polyethylene propylene diene terpolymer, and the like.
  • the polymer protective colloid may be used as a mixture of two or more kinds.
  • the nonionic surfactant and the polymer or polymer protective colloid can be used in combination with an anionic surfactant.
  • anionic surfactant include a fatty acid salt, an alkyl benzene sulfonate, an alkyl methyl taurate, a polyoxyethylene alkyl phenyl ether sulfate, a polyoxyethylene alkyl ether sulfonate, and the like.
  • the amount of the surfactant and / or polymer protective colloid used is such that the aqueous monomer solution is sufficiently dispersed, an effect commensurate with the amount used is obtained, and the total amount of the monomer is 10 from the viewpoint of economy. 0.1 to 5 parts by weight, preferably 0.2 to 3 parts by weight per 0 parts by weight 2/13768
  • the water-absorbent resin can be synthesized by a self-crosslinking type reaction without using a crosslinking agent.However, the water-absorbing resin is crosslinked by using an internal crosslinking agent having two or more polymerizable unsaturated groups or two or more reactive groups. You may.
  • Internal crosslinking agents include N, N'-methylenebis (meth) acrylamide, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, trimethylolpropane (Meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropanedi (meth) aryl ether, triarylamine, etc., compounds having two or more ethylenic unsaturated groups in one molecule; (poly) ethyleneglycoldiglycidyl And polyglycidyl ethers such as ether and glycerin triglycidyl ether; and halogenated oxy compounds such as epichlorohydrin and moebhydrin. One or more of these can be used in consideration of the reactivity and water solubility in the polymerization system.However, a compound having two or more glycidyl groups in one molecule
  • the amount of the internal cross-linking agent used is determined based on the total amount of the above-mentioned monomers of 100 parts by weight, from the viewpoint that the obtained water-absorbent resin has appropriate cross-linking to suppress the water-soluble property and exhibit sufficient water absorption. 0.001 to 3 parts by weight, more preferably 0.003 to 1 part by weight, and even more preferably 0.05 to 0.5 part by weight.
  • polymerization initiator examples include persulfuric acid sodium, sodium persulfate, ammonium persulfate, benzoyl peroxide, hydrogen peroxide, 1,2-diazobis (cyclohexane-one-potency nitrile), 2, 2, —Azobis (2-methyl-butyronitrile), 2,2'-azobisisobutyronitrile, 2,2'-azobis (2-amidinopropane) dihydrochloride, 2-cyano-2-propylazoformamide And a radical polymerization initiator such as dimethyl 2,2′-azobis (2-methylpropionic acid).
  • radical polymerization initiators are used in combination with sulfites, etc. 02 13768
  • the amount of the polymerization initiator used is 0 with respect to 100 mol of the total amount of the above monomers.
  • the amount be 0.05 to 1.0 mol.
  • the surfactant and / or polymer protective colloid is dissolved in an organic solvent, the monomer aqueous solution and a polymerization initiator are added, and the mixture is heated under stirring to perform reverse phase suspension polymerization in a water-in-oil system.
  • the reaction temperature of the polymerization reaction varies depending on the type of polymerization initiator and monomer used, or the concentration of the aqueous monomer solution, but the polymerization proceeds rapidly, the polymerization time is shortened, and it is economically preferable. From the viewpoint of easy removal of heat and smooth reaction, the temperature is preferably from 20 to 110 ° C, more preferably from 40 to 80 ° C.
  • the reaction time is usually 0.5 to 4 hours.
  • a surface cross-linking may be performed by acting a cross-linking agent containing two or more functional groups reactive with a carboxyl group.
  • a cross-linking agent one that can react with a carboxyl group in the water-absorbing resin is used.
  • epoxy compounds such as (poly) ethylene glycol diglycidyl ether, (poly) propylene glycol diglycidyl ether, (poly) glycerol polyglycidyl ether, and glycidyl; epichlorohydrin, epibromohydrin Haxen-modified compounds such as ⁇ , methyl-epichlorohydrin, etc .; (poly) ethylene glycol, (poly) propylene glycol, (poly) glycerin, diols, pentanediols, hexanediols, Examples include polyhydric alcohol compounds such as methylolpropane, diethanolamine, and triethanolamine. Among them, epoxy compounds are preferably used. These surface crosslinking agents may be used alone or in combination of two or more.
  • the amount of the surface cross-linking agent used is 0.01 to 5 parts by weight with respect to 100 parts by weight of the total amount of the above monomers, from the viewpoint of sufficiently maintaining the gel strength and water absorption of the water-absorbent resin at the time of water absorption. Parts by weight, preferably from 0.02 to 4 parts by weight, more preferably from 0.33 to 3 parts by weight. Good.
  • the method of adding the surface cross-linking agent is not particularly limited, and examples thereof include a method of adding the water-absorbing resin to a water-absorbing resin dispersed in an organic solvent, and a method of spraying the water-absorbing resin with a spray while stirring. Can be mentioned.
  • Examples of the timing of adding the surface cross-linking agent include a stage of a hydrogel after polymerization, a stage of hydrous particles during drying, and a stage after drying.
  • a method of adding to a water-absorbent resin dispersed in an organic solvent at the stage of a hydrogel after polymerization and a method of spraying the water-absorbent resin at the stage of water-containing particles during drying by spraying or the like are preferable.
  • the form of addition of the surface cross-linking agent is not particularly limited, but in order to uniformly add the surface cross-linking agent to the water-absorbing resin, the surface cross-linking agent must be dissolved and added to a hydrophilic solvent such as water. Is preferred.
  • a hydrophilic solvent such as water.
  • n-heptane 50-OmL of n-heptane was added to a 100-Om one-volume five-necked cylindrical round-bottom flask equipped with a stirrer, a reflux condenser, a dropping funnel, a thermometer, and a nitrogen gas inlet tube.
  • decaglycerin pentastearate surfactant: Sunsoft Q-185S, manufactured by Taiyo Kagaku Co., Ltd.
  • the whole amount of the aqueous monomer solution for polymerization was added to the above-mentioned five-necked cylindrical round-bottom flask with stirring and dispersed, and the system was sufficiently purged with nitrogen, and then heated to a bath temperature of 70 °. C, and the polymerization reaction was carried out for 1 hour.
  • 0.66 g of a 14% by weight aqueous solution of trans-1,2-diaminocyclohexanetetraacetic acid tetrasodium as an aminocarboxylate metal chelating agent was added with stirring. Thereafter, water was removed from the hydrogel by azeotropic dehydration out of the system.
  • n-heptane 500 ml of n-heptane was added to a 1000 ml five-necked cylindrical round bottom flask equipped with a stirrer, a reflux condenser, a dropping funnel, a thermometer and a nitrogen gas inlet tube. 0.92 g of a sucrose fatty acid ester having an HLB of 3.0 (surfactant: S-370 manufactured by Mitsubishi Chemical Corporation) was added and dispersed, and the temperature was raised to dissolve the surfactant. Cooled to 55 ° C.
  • surfactant S-370 manufactured by Mitsubishi Chemical Corporation
  • the monomer aqueous solution for the first-stage polymerization was added and dispersed in the above-described five-necked cylindrical round bottom flask under stirring with stirring, and the system was sufficiently purged with nitrogen, and then heated. After the polymerization reaction was carried out for 1 hour while maintaining the temperature at 70 ° C, the polymerization slurry was cooled to room temperature. Was.
  • n-heptane 500 ml of n-heptane was added to a 100 ml 5-neck cylindrical round bottom flask equipped with a stirrer, a reflux condenser, a dropping funnel, a thermometer and a nitrogen gas inlet tube. 0.92 g of a sucrose fatty acid ester having an HLB of 3.0 (surfactant: S-370 manufactured by Mitsubishi Chemical Corporation) was added and dispersed, and the temperature was raised to dissolve the surfactant. Cooled down to 55.
  • surfactant S-370 manufactured by Mitsubishi Chemical Corporation
  • the whole amount of the aqueous monomer solution for polymerization was added to the above-mentioned five-necked cylindrical round-bottom flask with stirring and dispersed, and the system was sufficiently purged with nitrogen, and then heated to a bath temperature of 70 °. C, and the polymerization reaction was carried out for 1 hour. After completion of the polymerization, water was removed from the hydrogel by azeotropic dehydration. To the obtained gel, 4.14 g of a 2% by weight aqueous solution of ethylene glycol diglycidyl ether was added, and water was removed again by distillation together with n-heptane. Then, powder was used as an aminocarboxylic acid-based metal chelating agent.
  • Example 5 The same operation as in Example 3 was carried out except that triethylenetetramine-6-acetic acid was not added, to obtain 92.0 g of a water-absorbent resin. 0.46 g of the above water-absorbent resin and powdered disodium diethylenetriamine pentaacetate (85 wt% of the total particle size is 100 am or less) are added and thoroughly mixed in a polyethylene bag. 92.5 g of resin were obtained.
  • Example 5 Example 5
  • N-heptane 50 Oml was added to a 100 ml 5-volume cylindrical round bottom flask equipped with a stirrer, a reflux condenser, a dropping funnel, a thermometer and a nitrogen gas inlet tube.
  • 0.92 g of sorbitan monostearate with an HLB of 4.7 surfactant: Nonionic SP-6 OR manufactured by NOF Corporation was added and dispersed, and the temperature was raised to increase the surfactant. After dissolving, the mixture was cooled to 50 ° C.
  • n-heptane n-heptane was added to a 1500 ml five-necked cylindrical round bottom flask equipped with a stirrer, a reflux condenser, a dropping funnel, a thermometer and a nitrogen gas inlet tube.
  • 0.84 g of sorbitan monolaurate with an HLB of 8.6 surfactant: Nonionic LP-2OR manufactured by NOF Corporation was added and dispersed, and the temperature was raised to increase the surfactant. After dissolving, the mixture was cooled to 40 ° C.
  • the whole amount of the aqueous monomer solution for polymerization was added to the above-mentioned five-necked cylindrical round-bottomed flask under stirring and dispersed, and the system was sufficiently purged with nitrogen, and then heated to a bath temperature of 70 °. C While maintaining the temperature, the polymerization reaction was performed for 3 hours. After the polymerization was completed, 0.175 g of a 40% by weight aqueous solution of diethylenetriamine pentaacetic acid and 5% sodium acetate was added to the hydrogel product under stirring as an aminocarboxylate-based metal chelating agent. Thereafter, water was removed from the hydrogel by azeotropic dehydration.
  • a water-absorbent resin was obtained in the same manner as in Example 5, except that 1.2 g of a 38% by weight aqueous solution of tetrasodium ethylenediamine tetraacetate was added in place of pentasodium diethylenetriamine pentaacetate. g was obtained. Comparative Example 1
  • Example 1 was repeated, except that no aminocarboxylic acid-based metal chelating agent was added, to obtain 92.1 g of a water-absorbent resin. Comparative Example 2
  • Example 2 The same operation as in Example 2 was carried out except that the aminocarboxylic acid-based metal chelating agent was not added in Example 2, to obtain 22.5 g of a water absorbent resin. Comparative Example 3
  • Example 4 The same operation as in Example 3 was carried out except that the aminocarboxylic acid-based metal chelating agent was not added, to obtain 92.1 g of a water-absorbing resin. Comparative Example 4
  • Example 1 trans- 1,2-diaminocyclohexanetetraacetic acid 92.8 g of a water-absorbent resin was obtained in the same manner as in Example 1, except that an aqueous solution in which 0.92 g of cunic acid was dissolved in 9.2 g of water was added instead of thorium. Comparative Example 5
  • Example 3 The same procedure as in Example 3 except that 0.46 g of sodium tripolyphosphate (90% by weight of the whole particles was 100 zm or less) was used instead of triethylenetetramine hexaacetic acid in Example 3 was carried out to obtain 92.6 g of a water-absorbing resin.
  • the coloring test of the water absorbent resin obtained in the above Examples and Comparative Examples was performed by the following method.
  • the measurement was performed using a double beam illuminating photometric colorimeter ⁇ —1001 DP (Nippon Denshoku Industries Co., Ltd.). From the X, Y, Z (tristimulus values) of the obtained water-absorbent resin, the yellowness was calculated by the following equation. Similarly, the yellowness of the water-absorbent resin before the test, which was left in a table-top constant temperature and humidity chamber for 20 days, was determined. The above measurement was performed three times, and the average of the values was defined as yellowness.
  • Table 1 shows the results of the coloring tests of the aminocarboxylic acid-based metal chelating agents used in the above Examples and the water-absorbing resins obtained in the above Examples and Comparative Examples.
  • the amounts in parentheses in Table 1 are based on 100 parts by weight of acrylic acid.
  • Table 1 shows that the water-absorbent resin to which the aminocarboxylic acid-based metal chelating agent obtained in the examples was added had a small change in yellowness before and after the test, and the coloring was suppressed.
  • the aminocarboxylic acid-based metal chelate obtained in Comparative Example It can be seen that the water-absorbent resin to which no agent was added had a large change in yellowness and was considerably colored.

Abstract

L'invention concerne un procédé de prévention de la coloration d'une résine absorbant l'eau obtenue à l'aide d'un acide carboxylique non saturé comme monomère essentiel. Ce procédé se caractérise en ce qu'il consiste à ajouter un agent chélateur de métal de type acide aminocarboxylique au système au cours d'au moins une des étapes pour produire la résine absorbant l'eau ou à la résine absorbant l'eau après sa production. L'invention a aussi pour objet un procédé d'utilisation d'un agent chélateur de métal de type acide aminocarboxylique pour empêcher la coloration d'une résine absorbant l'eau obtenue à l'aide d'un acide carboxylique insaturé comme monomère essentiel, caractérisé en ce qu'il consiste à ajouter l'agent chélateur de métal de type acide aminocarboxylique au système au cours d'au moins une des étapes pour produire la résine absorbant l'eau ou à la résine absorbant l'eau après sa production
PCT/JP2002/013768 2002-01-15 2002-12-27 Procede de prevention de la coloration d'une resine absorbant l'eau WO2003059961A1 (fr)

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JP2002005417A JP2003206381A (ja) 2002-01-15 2002-01-15 吸水性樹脂の着色防止方法
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EP1466928A1 (fr) * 2002-01-16 2004-10-13 Sumitomo Seika Chemicals Co., Ltd. Procede de production d'une resine absorbant l'eau
WO2011040575A1 (fr) 2009-09-30 2011-04-07 株式会社日本触媒 Résine absorbant l'eau à base d'un sel d'acide polyacrylique et son procédé de production
EP2998325A4 (fr) * 2014-07-11 2016-07-20 Sumitomo Seika Chemicals Résine absorbant l'eau et article absorbant
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WO2007004529A1 (fr) 2005-07-04 2007-01-11 Sumitomo Seika Chemicals Co., Ltd. Procédé de fabrication de résine absorbant l’eau
TWI394789B (zh) 2005-12-22 2013-05-01 Nippon Catalytic Chem Ind 吸水性樹脂組成物及其製造方法、吸收性物品
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JP5415256B2 (ja) 2006-08-31 2014-02-12 株式会社日本触媒 粒子状吸水剤およびその製造方法
CN101589066B (zh) 2007-01-24 2013-07-03 株式会社日本触媒 粒子状吸水性聚合物及其制造方法
EP2116571B1 (fr) 2007-02-05 2019-05-01 Nippon Shokubai Co., Ltd. Absorbant d'eau granulaire et son procédé de fabrication
SA08290402B1 (ar) 2007-07-04 2014-05-22 نيبون شوكوباي كو. ، ليمتد عامل دقائقي ماص للماء وطريقة لتصنيعه
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US8063121B2 (en) 2008-10-08 2011-11-22 Evonik Stockhausen Gmbh Process for the production of a superabsorbent polymer
US8357766B2 (en) 2008-10-08 2013-01-22 Evonik Stockhausen Gmbh Continuous process for the production of a superabsorbent polymer
CN102548654A (zh) 2009-09-29 2012-07-04 株式会社日本触媒 颗粒状吸水剂及其制造方法
WO2011155540A1 (fr) 2010-06-08 2011-12-15 株式会社日本触媒 Procédé de fabrication pour de la résine absorbant l'eau granulaire
JP6045784B2 (ja) * 2011-11-15 2016-12-14 日清ファルマ株式会社 難着色性ピロロキノリンキノン類含有製剤
EP2893974B1 (fr) 2012-09-10 2017-11-08 Sumitomo Seika Chemicals Co. Ltd. Résine d'absorption d'eau, corps d'absorption d'eau, et produit d'absorption d'eau
CN105658323B (zh) 2013-10-09 2019-05-10 株式会社日本触媒 以吸水性树脂作为主要成分的颗粒状吸水剂及其制造方法
CN104672479A (zh) * 2013-12-02 2015-06-03 上海华谊新材料有限公司 高吸水性树脂及其制备方法
WO2016158976A1 (fr) 2015-03-30 2016-10-06 株式会社日本触媒 Agent particulaire absorbant l'eau
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EP1466928B1 (fr) * 2002-01-16 2014-04-16 Sumitomo Seika Chemicals Co., Ltd. Procede de production d'une resine absorbant l'eau
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KR20210058928A (ko) 2018-09-21 2021-05-24 가부시키가이샤 닛폰 쇼쿠바이 킬레이트제를 포함하는 흡수성 수지의 제조 방법

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JP2003206381A (ja) 2003-07-22

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