JPH11116829A - Highly water-absorptive polymer composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a highly water-absorptive polymer composition having improve stability with time against body fluid, and manifesting an excellent deodorant function even in a powder or gel state. SOLUTION: This highly water-absorptive polymer composition comprises (A) a highly water-absorptive polymer having a cross-linking structure and containing a carboxyl group and/or a carboxylate group as a constituent unit of the polymer, and (B) a complex silicate compound containing SiO2 within a range of 30-80 wt.%. The total amount of the components B and C is 0.05-10 pts.wt. based on 100 pts.wt. of the component A, and the compounding ratio of the components B to C represented in terms of weight ratio is (90:10)-(10:90).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a superabsorbent composition. More specifically, the present invention relates to a composition in which tannic acid (salt) and a specific composite silicate compound are blended with a superabsorbent polymer. The superabsorbent polymer composition of the present invention improves the stability over time of the gel after absorbing water without impairing the original water absorbing performance of the superabsorbent polymer composition, and further has a deodorizing function, such as ammonia. Can strongly suppress the generation of odorous substances. Therefore, it is very effective against body fluids such as urine, blood and sweat, and can be effectively used as a sanitary material for children / adult paper diapers, sanitary products and various pads.

[0002]

2. Description of the Related Art In recent years, superabsorbent polymers have been used not only in sanitary fields such as sanitary products and disposable disposable diapers, but also in various industrial products such as water-blocking materials, anti-condensation agents, freshness-retaining materials, and solvent dehydrating agents, as well as greening. It has also been put to practical use in the agricultural and horticultural fields, and its application range is expanding further. Among these application fields, sanitary products such as sanitary products, disposable diapers, incontinence pads, etc.
Recently, the wearing feeling has been improved by improving the materials used, draping, various gathers, and the like, and the mounting time has been prolonged.

[0003] A superabsorbent polymer becomes a gel when absorbing body fluids such as urine, menstrual blood, and sweat. However, the gel deteriorates and decomposes over time to lose its strength, and at the same time, the surface and inside of the gel become sticky. It comes to be. That is, the liquid retention of the body fluid absorbing gel decreases with time. Problems such as liquid leakage during use of the sanitary ware and deterioration of the feeling of wearing due to this have become more serious with recent prolonged wearing time.

On the other hand, when a superabsorbent polymer absorbs bodily fluids such as urine, menstrual blood and sweat, it undergoes gel deterioration with the passage of time and generates malodorous substances such as ammonia and mercaptan due to the bodily fluid components. Therefore, the appearance of a superabsorbent polymer excellent in deodorizing properties capable of removing these malodorous substances has been desired for the superabsorbent polymer. As a method of improving the gel stability, for example, a method of increasing the crosslink density of the superabsorbent polymer can be considered, but in this case, there is a problem that the water absorbing ability of the polymer is reduced. Also, JP-A-63
JP-A-118375 discloses a method of incorporating an oxygen-containing reducing inorganic salt and / or an organic antioxidant in a polymer, JP-A-63-153060 discloses a method of incorporating an oxidizing agent, and JP-A-63-127754. Japanese Unexamined Patent Publication No. 63-272349 discloses a method containing a sulfur-containing reducing agent, and Japanese Unexamined Patent Publication No. 1-2756 / 1988.
No. 61 proposes a method of containing an amine compound containing a phosphinic acid group or a phosphonic acid group or a salt thereof, and the like.

[0005] However, any of these methods is insufficient to prevent the deterioration of the body fluid-absorbing gel, or has a problem that the dispersion is extremely large due to the individual difference of the body fluid and there is no stability to prevent the deterioration. Further, in any of these methods, not only the malodorous substance generated from the body fluid cannot be removed but also the additive itself may generate a malodorous substance such as a sulfur-containing reducing agent.

As a method for removing malodorous substances generated from body fluids, JP-A-59-105448 discloses a method containing activated carbon, and JP-A-60-158861 discloses a leaf extract of a Camellia plant. Japanese Patent Application Laid-Open Nos. Hei 1-5546 and Hei 1-5547 disclose a method for containing an oxide of a specific metal.
No. 55 discloses a method of incorporating tea production,
No. 7143 proposes a method of including a metal complex, and the like. However, any of these methods can remove some offensive odor substances in the state of the polymer powder, but has a problem that the deodorant performance is greatly reduced after the body fluids and the like are absorbed and gelled. Also, in any of these methods, there is almost no effect on the temporal stability of the liquid-absorbing gel.

[0007]

In order to solve the problem of stability over time with respect to body fluid, the present inventors have proposed a method of adding a tannic acid (salt) compound to a superabsorbent polymer (Japanese Patent Laid-Open No. 7-2).
No. 28790) was previously proposed. It has been found that these methods greatly improve the above-mentioned stability against body fluid over time. Furthermore, the present inventors have found in recent studies that the superabsorbent polymer containing the above-mentioned substance is in the form of a polymer powder and a liquid-absorbing gel, such as ammonia, which is a malodorous substance, in comparison with the conventional superabsorbent polymer aged over time. It has been found that the occurrence of odor is suppressed. However, at the same time, it turned out that there was room for improvement in its capabilities.

The present invention aims to solve the problems of the above-mentioned prior art superabsorbent polymer with respect to the stability of the body fluid over time after absorption of urine and the like and the generation of malodorous substances. It is an object of the present invention to provide a superabsorbent polymer composition which has improved stability over time with respect to body fluid without impairing water absorption performance, and which exhibits a high deodorizing function even in a powder or gel state.

[0009]

Under these circumstances, the present inventors have conducted further intensive studies. As a result, in addition to a tannic acid (salt) compound, a specific composite silicate compound (hereinafter, referred to as a silicate compound) is added to the superabsorbent polymer. , A complex silicate), the aging effect of the body fluid-absorbing gel, the deodorizing effect of the polymer powder, and the deodorizing effect of the liquid-absorbing gel cannot be obtained alone. And found that the present invention was completed.

That is, the gist of the present invention is to provide (A) a superabsorbent polymer having a crosslinked structure and containing a carboxyl group and / or a carboxylate group as a constituent component of a polymer, and (B) tannic acid (salt). ) And (C) SiO ₂ for 30
(B) and (C) comprising a composite silicate compound contained in the range of .about.80% by weight and based on 100 parts by weight of (A).
In the superabsorbent polymer composition, wherein the total amount of (B) and (C) is from 90:10 to 10:90 by weight. Hereinafter, the present invention will be described in detail.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

(Superabsorbent polymer (A)) As the superabsorbent polymer used in the present invention, any superabsorbent polymer having a crosslinked structure and having a carboxyl group and / or a carboxylate group as a component of the polymer can be used. The type of the polymer and the polymerization method are not limited. Among them, crosslinked polyacrylate, crosslinked starch-acrylic acid graft copolymer, hydrolyzed starch-acrylonitrile graft copolymer crosslinked product, hydrolyzed acrylate-vinyl acetate copolymer, acrylate Preferred examples include crosslinked acrylamide copolymers and hydrolyzed products of crosslinked polyacrylonitrile. Other than the above, polyethylene oxide crosslinked with acrylic acid, crosslinked product of sodium carboxycellulose, maleic anhydride-
Isobutylene, maleic acid salt to acrylic acid, itaconic acid salt, 2-acrylamide-2-methylsulfonic acid salt, 2-
Examples thereof include those obtained by copolymerizing comonomers such as acroylethanesulfonic acid and 2-hydroxyethyl acrylate. Examples of the type of the salt of the carboxylate group in the superabsorbent polymer include an alkali metal salt, an alkaline earth metal salt, and an ammonium salt. Among them, an alkali metal salt is preferable.

The above superabsorbent polymer is generally prepared by adding a polymerizable monomer having a carboxyl group and / or a carboxylate group such as acrylic acid (salt) or maleic anhydride (salt) to water, a radical polymerization initiator, It can be obtained by polymerization by a known aqueous solution polymerization method, solution polymerization method, or reverse phase suspension polymerization method in the presence or absence of a crosslinking agent. For example, Japanese Patent Publication No. 60-25045
JP-A-57-158210, JP-A-57-214
No. 05, JP-B-53-46199, JP-A-58-71
No. 907, JP-A-55-84304, JP-A-56-9
1837, JP-A-2-49002 and JP-A-62
It can be produced by the methods described in JP-A-62807 and other publications.

The cross-linking structure of the superabsorbent polymer used in the present invention is internal cross-linking or surface cross-linking. In internal cross-linking, before or after polymerization, a cross-linking agent is uniformly dispersed in the polymer and the inside of the polymer is uniformly formed. It is made by crosslinking. On the other hand, the internal crosslinking includes self-crosslinking derived from the polymerizable monomer itself due to, for example, heat during polymerization without using a crosslinking agent. As a method using a cross-linking agent, for example, a cross-linking agent having two or more double bonds in a molecule and showing copolymerizability with a polymerizable monomer or a functional group in a polymerizable monomer in a molecule is used. For example, those having two or more functional groups capable of reacting with a carboxyl group and / or a carboxylate group during polymerization or during drying after polymerization are exemplified.

One example of the former crosslinking agent is N--N'-.
Methylene bisacrylamide, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, diallyl phthalate, diallyl maleate, diallyl terephthalate, triallyl cyanurate, Triallyl phosphate and the like. Further, examples of the latter crosslinking agent include ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, di- or polyglycidyl ether of aliphatic polyhydric alcohol, and the like. Furthermore, N-methylolacrylamide, glycidyl methacrylate and the like are provided as those having both the former and latter functions.

The above superabsorbent polymer is generally obtained as a gel containing water as a polymer. Usually, this hydrous gel is dehydrated as it is or by azeotropic distillation with an inert solvent. Classification etc. are performed to produce the product.
The surface cross-linking of the present invention does not treat the inside of the superabsorbent polymer particles, but means that the surface is cross-linked or hydrophobically modified in the course of the manufacturing process or the product to modify the surface.

The crosslinking agent used for such surface crosslinking is a crosslinking agent having two or more functional groups capable of reacting with a carboxyl group and / or a carboxylate group.
Either can be used. For example, polydiglycidyl ether compounds, haloepoxy compounds, aldehyde compounds, isocyanate compounds and the like can be used, and polyglycidyl ethers are particularly common. The use amount and addition method of these crosslinking agents are not particularly limited, but are usually used in the range of 0.005 to 5% by weight based on the polymer. In addition to the above crosslinking agents, polyvalent metal salts such as aluminum hydroxide and the following silane compounds can also be used for surface crosslinking.

[0017]

Embedded image X (R) _m Si (Y) _3-m

(Where X represents a functional group capable of reacting with a carboxyl group and / or a carboxylate group in the superabsorbent polymer, R represents a hydrocarbon group, and Y represents a hydrolyzable group. m is 0, 1 or 2. Specifically, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxy Silane, γ- (2-aminoethyl) aminopropyltrimethoxysilane, γ- (2-aminoethyl)
Aminopropylmethyldimethoxysilane, γ-aminopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-chloropropyltrimethoxysilane, γ-chloropropylmethyldimethoxysilane,
Octadecyldimethyl [3- (trimethoxysilyl) propyl] ammonium chloride and the like.

As the polyvalent metal compound, Mg, Ca, B
a, a divalent metal compound such as Zn, and a trivalent metal compound such as Al and Fe; specifically, magnesium sulfate, aluminum sulfate, ferric chloride, calcium chloride, magnesium chloride, aluminum chloride, polyaluminum chloride, and nitric acid Iron, calcium nitrate, aluminum nitrate, aluminum hydroxide and the like are used. The use amount and addition method of these compounds are not particularly limited, but are usually 0.001 to 10% by weight based on the polymer.

When the surface of the superabsorbent polymer is treated with these compounds, it reacts with the polymer on the surface, and these compounds are hydrophobized or modified, and in some cases, cross-linked to make the surface hydrophobic. In addition, fusion of particles can be prevented, and the water absorption rate can be increased. The average particle size of the superabsorbent polymer used in the present invention is usually 10 to 20.
00 μm, preferably 50 to 1000 μm.

(Tannic acid (salt) compound (B)) The tannic acid (salt) compound used in the present invention is hydrolyzed due to its chemical structure to gallic acid, eragic acid or a more complex polyphenolcarboxylic acid and sugar or saccharide. They are classified into hydrolyzable tannins that produce polyhydric alcohols and condensed tannins that are not hydrolyzed and become insoluble brown frobeafen. Hydrolyzed tannins are classified into those called gallotannins, which decompose to produce gallic acid, and those which decompose to produce erragic acids.

Gallotannin is a tannin obtained from worms (fivefold), smacks, cod, and the like, and eragtannin is a tannin obtained from dibinbi, myrobaran, algarobila, edelkastania, chestnut, oak, and baronia. On the other hand, the condensed tanni is obtained from Gambia, Quebracho, Mimosa, Mangrove, Hemlock, Spruce, Burma Kutch, Kashiwa bark, Persimmon astringent and the like. In the present invention, any of the above-mentioned tannins can be used, but a hydrolyzable tannin is preferable, and among them, gallotannin is particularly preferable in terms of gel stability. These tannins are generally present in the form of tannic acid, but can also be used as a tannate salt neutralized with an alkali such as sodium hydroxide in some cases.

(Composite silicate compound (C)) As the composite silicate compound used in the present invention, SiO ₂
Any composite silicate of any composition can be used as long as it has a deodorizing function for both acidic malodors such as mercaptan and hydrogen sulfide and basic malodors such as ammonia and amines. It is possible. When the composition ratio of SiO ₂ is 80
%, Ammonia deodorization is excellent,
Since it has no effect on amines such as trimethylamine and sulfur-based malodorous components such as hydrogen sulfide and mercaptan, it is out of the scope of the present invention. Further, the composition ratio of SiO ₂ is
If it is less than 30%, the powder properties such as fluidity may be deteriorated, which is not preferable.

The oxide components other than SiO ₂ in the composite silicate compound include ZnO, Al ₂ O ₃ , Ag
₂ O, MgO and the like can be mentioned. Of these, ZnO, A
The two components of l ₂ O ₃ are preferred in terms of deodorizing performance and the hue of the silicate compound, and among them, ZnO is most preferred. The average particle size of the composite silicate is preferably small, for example, 50 μm or less, particularly preferably 10 μm or less, because the surface area increases.

The amounts of the tannin (salt) compound and the composite silicate vary depending on the type, properties and average particle size of the superabsorbent polymer used, but are generally based on 100 parts by weight of the superabsorbent polymer. , Tannic acid and composite silicate in a total amount of 0.05 to 10 parts by weight, preferably 0.1 to 10 parts by weight.
5 parts by weight. When the amount is less than 0.05 part by weight, the effect is insufficiently developed, and when the amount exceeds 10 parts by weight, the effect is saturated. The mixing ratio of the tannic acid (salt) compound and the composite silicate is 10:90 to 90:10, preferably 30:70 to 70:30 by weight.

If the proportion of the tannic acid (salt) compound is too large, the stability with time against body fluid is improved, but the deodorant function does not reach the target level of the present invention, which is not preferred. When the proportion of the composite silicate is too large, the stability with respect to body fluid over time is not improved, and is out of the intention of the present invention.

(Production of superabsorbent polymer composition) The method for obtaining the superabsorbent polymer composition of the present invention is not particularly limited, and the above tannic acid (salt) compound and the composite The silicate can be obtained by uniformly adding and dispersing or impregnating a predetermined amount of a silicate. Addition dispersion or impregnation can be performed by any conventionally known method or means, and a mixer generally used for powder mixing or solid-liquid mixing, for example, a tank-type mixer equipped with stirring blades,
It can be easily performed by using a tumbling mixer, a flow mixer, an airflow mixer, a vibration mixer, or a high-speed rotary paddle machine. Further, depending on the case, it may be added and dispersed or impregnated during the steps of polymerization, aging, dehydration, surface modification, granulation and the like of the superabsorbent polymer.

The solvent used for the impregnation may be a polar solvent such as water or various alcohols or a non-polar solvent such as an aliphatic or alicyclic hydrocarbon, as long as the powder can be dissolved. The tannic acid (salt) compound and the composite silicate may be added and dispersed or impregnated to the superabsorbent polymer in the same step, or may be added and dispersed or impregnated to the polymer in separate steps. Furthermore, they may be mixed in a non-contact state with each other via another material such as a fiber base material. The temperature for mixing or impregnating is generally from room temperature to 150 ° C, preferably from room temperature to 50 ° C.

[0029]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to the examples. The following characteristic values of the superabsorbent polymer obtained in the examples were limited by the following methods. (Water absorption capacity) About 0.5 g of a water-absorbing polymer was precisely weighed,
Mesh nylon bag (20cm x 10cm size)
And immerse in 500 cc of artificial urine for 30 minutes. Thereafter, the nylon bag was pulled up, drained for 15 minutes, weighed, corrected for blank, and calculated water absorption capacity.

The composition of the artificial urine is as follows. Urea 1.94% Sodium chloride 0.80% Calcium chloride 0.06% Magnesium sulfate 0.11% Pure water 97.09%

(Powder Deodorizing Test) Three glass containers each having a capacity of about 500 ml were prepared, and 1 g of the superabsorbent polymer was placed in each container. A predetermined amount was injected, sealed and left for 3 hours. Three hours later, the malodor concentration was measured using a gas-tech detector tube for each malodorous substance. The measurement without the superabsorbent polymer as a blank was also performed. The composition / amount of the malodorous substance solution used and the detector tube used are shown below. Object malodor Solution composition / addition amount Detector tube Ammonia 0.05 wt% ethanol solution 200 μl 3 L Methylamine 0.1 wt% aqueous solution 400 μl 180 t-butyl mercaptan 0.1 wt% aqueous solution 400 μl 70 L Furthermore, the concentration of each malodor substance in the blank test is shown below. Target odor concentration (ppm) Ammonia 40 Methylamine 50 t-Butylmercaptan 5.0

(Gel deodorizing test) 4 g of superabsorbent polymer
With a cotton nonwoven fabric (basis weight: 150 g / m ² , size 1)
(1 × 8 cm). Furthermore, a nonwoven fabric made of the same material and the same size as the above nonwoven fabric is put on the nonwoven fabric to prepare a simple liquid absorbing pad. The liquid absorbing pad is placed in a 250 ml glass container with a lid, and after absorbing 100 g of adult human urine (mixed with human urine of 5 adults), the lid is closed and the set temperature is set to 40 ° C.
And left in a thermostat. After the standing, the temperature of the off-flavor inside the container was measured using a gas tube detector made by Gastec. The foul odor substances and the detector tube numbers used are as follows. Ammonia Gastec detector tube: 3L All amines Gastec detector tube: 180 Hydrogen sulfide Gastec detector tube: 4LT All mercaptan Gastec detector tube: 70L

(Stability of Gel Over Time) The swollen gel after the above-mentioned deodorizing test was taken out, and the stability was evaluated by touch and appearance of the gel. The scale of stability was the following three steps. …: The swollen particles have the same shape, and the touch is hard. Δ: Does not dissolve, but the shape of the swollen particles is unclear and the touch is soft. ×: Partial dissolution occurs, and a liquid state is observed. The touch is close to a viscous liquid. In the experimental examples and comparative examples described later, the following superabsorbent polymers and composite silicates were used.

Superabsorbent polymer (a1) In a 5000 ml four-necked round bottom flask equipped with a stirrer, a reflux condenser, a temperature tube and a nitrogen gas inlet tube, 1210 g of cyclohexane was placed, and sorbitan monostearate 9 was added.
After adding g to dissolve, nitrogen gas was blown in to expel dissolved oxygen. Separately, 350 g of acrylic acid was dissolved in 727.7 g of water while 350 g of acrylic acid was externally cooled in a beaker having a capacity of 2000 ml.
70% of carboxyl groups by adding
Was neutralized. In this case, the monomer concentration with respect to water corresponds to 35% by weight as the monomer concentration after neutralization. Then, N, N'-methylenebisacrylamide was added to the mixture.
After 37 g and 0.94 g of potassium persulfate were added and dissolved, nitrogen gas was blown in to expel dissolved oxygen. The contents of the four-necked round-bottomed flask are added to the volume of 2000 ml.
The contents of the beaker were added, and the mixture was stirred and dispersed, and the inside temperature of the flask was raised by an oil bath while bubbling nitrogen gas. After a sufficient time, the temperature reached 75 ° C. Then, after reacting for 3 hours while stirring, when the stirring was stopped, the wet polymer particles settled at the bottom of the round bottom flask, and thus could be easily separated from the cyclohexane phase by decantation.
The separated wet polymer was transferred to a reduced-pressure drier and heated to 90 ° C. to remove the attached cyclohexane and water. As a result, 400 g of a smooth superabsorbent polymer was obtained.

The dried polymer 10 thus obtained is
0 g was placed in a 500 ml eggplant-shaped flask, and then 122.5 g of cyclohexane was added to form a slurry. While stirring this slurry, a liquid in which 0.44 g of γ-glycidoxypropyltrimethoxysilane was dispersed in 22.5 g of water was added, and the mixture was stirred at room temperature for 30 minutes. Then, after being immersed in a 105 ° C. oil bath for 30 minutes, it was evaporated to dryness while maintaining the oil bath temperature to obtain 95 g of a dry polymer.

Superabsorbent polymer (a2) In the superabsorbent polymer (a1), 0.8 g of ethylene glycol diglycidyl ether was used in place of γ-glycidoxypropyltrimethoxysilane.
958 g of dry polymer were obtained. Superabsorbent polymer (a3) Starch-acrylate graft copolymer crosslinked product (trade name:
Sunwet 1M-1000, manufactured by Sanyo Chemical Industries) was used.

Superabsorbent polymer (a4) Crosslinked polyacrylate (trade name: Aquaric CAW)
-4, manufactured by Nippon Shokubai). Complex silicate (c1) Zinc aluminosilicate (trade name: Mizucanite HP, manufactured by Mizusawa Chemical Industry Co., Ltd., components and content when dried: Si
O ₂ , 52 wt%, ZnO 38 wt%, Al ₂ O ₃ 10
wt%).

Complex silicate (c2) Silicon dioxide, zinc oxide, aluminum oxide, potassium persulfate
Compound of lithium (trade name: Mizukanite AP, Mizusawa Chemical)
Components manufactured by Kogyo Co., Ltd. when dried and their content: SiO_Two
49.7 wt%, ZnO 36.3 wt%, Al_TwoO
_Three9.5 wt%, K _TwoS_TwoO₈9.5 wt%)
Was. Complex silicate (c3) A mixture of silicon dioxide and zinc oxide (trade name: Shukure
KD-211S, manufactured by Lhasa Industry Co., Ltd., components when dried
And content: SiO_Two73.2 wt%, ZnO 26.8
wt%).

Examples 1-32 A tannic acid (salt) compound and a composite silicate were added to the superabsorbent polymers (a1) to (a4), and a V blender (Model S-5, manufactured by Tsutsui Rikakiki Co., Ltd.) 30)
The mixture was uniformly mixed at room temperature for 1 minute to obtain a superabsorbent polymer composition. The type and amount of the superabsorbent polymer, tannic acid (salt) compound and composite silicate used are as shown in Table 1. The above measurement was performed on the obtained superabsorbent polymer composition. The results are shown in Table 2.

Comparative Examples 1 to 10 Highly water-absorbing polymer compositions obtained by adding only one of a tannic acid (salt) compound and a composite silicate and mixing them in the same manner as in the above examples; The above measurements were performed on the superabsorbent polymer composition itself to which none of these compounds was added. Super absorbent polymer used,
Table 1 shows the types and amounts of the tannic acid (salt) compound and the composite silicate, and Table 2 shows the measurement results. As is evident from the results shown in Table 2, the superabsorbent polymer composition of the present invention has significantly improved stability over time against body fluid without impairing the original water absorbing performance of the superabsorbent polymer, / Excellent deodorant function in gel state.

[0041]

[Table 1]

[0042]

[Table 2]

[0043]

[Table 3]

[0044]

[Table 4]

[0045]

As described above, the superabsorbent polymer composition according to the present invention has improved stability over time against body fluid without deteriorating the inherent water absorption performance of the superabsorbent polymer, and exhibits an excellent deodorizing function. Therefore, the superabsorbent polymer composition of the present invention can be particularly preferably used in the field of sanitary materials such as disposable diapers, sanitary napkins and various pads.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08K 3:34 5:13)

Claims (7)

[Claims] 1. A superabsorbent polymer (A) having a crosslinked structure and containing a carboxyl group and / or a carboxylate group as a constituent of a polymer, (B) a tannic acid (salt) and (C) SiO (A) 10 consisting of a composite silicate compound containing ₂ in the range of 30 to 80% by weight.
The total amount of (B) and (C) is 0.05 to 0 parts by weight.
A super water-absorbing polymer composition comprising 10 parts by weight, and the blending ratio of (B) and (C) is 90:10 to 10:90 by weight. 2. The superabsorbent polymer (A) is a crosslinked product of a polyacrylate, a crosslinked product of a starch-acrylic acid graft copolymer, a hydrolyzate of a crosslinked product of a starch-acrylonitrile graft copolymer, an acrylate ester 2. The high-molecular-weight composition according to claim 1, which is at least one selected from the group consisting of a hydrolyzate of a crosslinked product of a vinyl acetate copolymer, a crosslinked product of an acrylate-acrylamide copolymer and a hydrolyzed product of a crosslinked polyacrylonitrile. Water-absorbing polymer composition. 3. The superabsorbent polymer composition according to claim 1, wherein the tannic acid (salt) is a hydrolyzable tannic acid (salt). 4. The superabsorbent polymer composition according to claim 1, wherein the tannic acid (salt) is gallotannic acid (salt). 5. The composite silicate compound having a composition ratio of SiO 2
₂ 30-80 _{wt%, Al 2 O 3, ZnO} , Ag 2 O
The superabsorbent polymer composition according to any one of claims 1 to 4, wherein at least one metal oxide selected from the group consisting of MgO and MgO is 20 to 70% by weight. 6. The composition ratio of the composite silicate compound is SiO 2
₂ 30-80 wt%, Al ₂ O ₃ and / or superabsorbent polymer composition according to any one of claims 1 to 4 ZnO is 20 to 70 wt%. 7. The composition ratio of the composite silicate compound is SiO.
5. The superabsorbent polymer composition according to claim 1, wherein ₂ is 30 to 80% by weight and ZnO is 20 to 70% by weight.