JP3340821B2 - Superabsorbent polymer composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a superabsorbent polymer composition. The superabsorbent polymer composition of the present invention has a significantly improved gel strength after water absorption and is stably present for a long time without impairing the original water absorbing performance of the superabsorbent polymer, and further has a "sticky" gel surface. Disappears.
In particular, since it is very effective for body fluids such as urine whose components are not constant, it can be advantageously used as a sanitary material such as disposable diapers, sanitary napkins, and various pads.

[0002]

2. Description of the Related Art In recent years, superabsorbent polymers have been used not only as sanitary materials for sanitary products and disposable disposable diapers, but also for industrial applications such as water-blocking materials, anti-condensation agents, freshness-retaining materials, and solvent dehydrating agents. It is being put to practical use for agricultural and horticultural purposes, etc.
The range of application is expanding further in the future. Among them, sanitary products, sanitary materials such as disposable disposable diapers and incontinence pads,
Recently, the wearing feeling has been improved by improving the materials used, draping, various gathers, and the like, and the mounting time of the above-described water-absorbing article has been increasing. In addition, they are often used under extremely severe conditions in industrial applications and agricultural and horticultural applications. On the other hand, when the superabsorbent polymer absorbs bodily fluids such as urine, menstrual blood, and sweat, the gel deteriorates and decomposes with time and loses its strength, and at the same time, the gel surface and inside become sticky. As a result, as the mounting time of the water-absorbent article becomes longer, the liquid retaining property is reduced, which causes a problem that the liquid leakage increases, a feeling of mounting deteriorates, and the like.

Although the cause of degradation and degradation of this gel is not clear, it is presumed that trace active impurities contained in body fluid such as urine accelerate the degradation of the superabsorbent polymer gel according to a single or a plurality of expression mechanisms. . Therefore, the degree of decomposition and the behavior vary depending on the state when the liquid is absorbed and the individual difference of the body fluid, and at present, the dispersion is large. Against such a background, in the art, in order to prevent variations due to such conditions at the time of liquid absorption, excretion time of body fluids or individual differences, and to maintain stability against all body fluids such as urine, strength and stability over time. The emergence of a superabsorbent polymer having excellent gel properties has been desired. As a method of improving the strength and stability of the gel, for example, a method of increasing the cross-linking density of the superabsorbent polymer is considered. Need and not economical.

On the other hand, Japanese Patent Application Laid-Open No. 63-118375 discloses
JP-A-63-153060 discloses a method of containing an oxygen-containing reducing inorganic salt and / or an organic antioxidant. JP-A-63-153060 discloses a method of containing an oxidizing agent.
Japanese Patent Application Laid-Open No. Sho 63-163 discloses a method of incorporating an antioxidant.
272349 discloses a method of containing a sulfur-containing reducing agent, JP-A-63-146964 discloses a method of containing a metal chelating agent, and JP-A-63-15266 discloses a method of containing a radical chain inhibitor. JP-A 1-2
JP-A-75661 discloses a method of containing an amine compound containing a phosphinic acid group or a phosphonic acid group or a salt thereof, JP-A-64-29257 discloses a method of containing a polyvalent metal oxide, and JP-A-2-255804. JP-A-3-
179008 discloses a method in which a water-soluble chain transfer agent is allowed to coexist at the time of polymerization, and the like. However, any of these methods is not sufficient to prevent gel deterioration, or has extremely large variations due to individual differences in body fluids, and thus has a problem of lack of stability to prevent deterioration. Further, each of these conventional techniques has a disadvantage that there is almost no effect of improving the gel strength related to the stickiness of the gel.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the problem relating to the stability with time of the gel after absorption of a body fluid such as urine in a conventional superabsorbent polymer. Highly water-absorbing without significantly impairing water-absorbing performance, greatly improving gel strength after water absorption and existing stably for a long time, preventing the stickiness of the gel, and eliminating individual differences in body fluids such as urine and variations in excretion timing It is intended to provide a polymer composition.

[0006]

Means for Solving the Problems The present inventors have found that the above objects can be achieved by adding an oxalic acid (salt) compound to a superabsorbent polymer, and have completed the present invention. That is, the present invention relates to “1. A superabsorbent polymer (A) having a crosslinked structure and containing a carboxyl group and / or a carboxylate group as a constituent component of a polymer, and an oxalate compound (B). Wherein the superabsorbent polymer (A) is
With polyvalent metal compounds such as minium and the following silane compounds
Are those treated with the polymer surface modified, X (R) m Si ( Y) 3-m ( wherein, X is and carboxyl groups in the superabsorbent polymer
And / or a functional group capable of reacting with a carboxylate group is represented by R
Y represents a hydrolyzable group, m represents 0, 1 or
2) and (A) 100 parts by weight of (B) 0.05 to 1
A superabsorbent polymer composition having a mixing ratio of 0 parts by weight. 2. A super-absorbent polymer (A) having a cross-linked structure and containing a carboxyl group and / or a carboxylate group as a component of the polymer, a cross-linked polyacrylate;
Starch-acrylate graft copolymer crosslinked product, starch-acrylonitrile graft copolymer crosslinked product hydrolyzate,
One or two or more selected from the group consisting of a hydrolyzate of an acrylic ester-vinyl acetate copolymer cross-linked product, an acrylic acid salt-acrylamide copolymer cross-linked product, a polyacrylonitrile cross-linked hydrolyzate, and the like. 2. A superabsorbent polymer composition according to claim 1. 3 . The silane compound is γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, β- (3,4-epoxycyclohexyl)
Ethyltrimethoxysilane, γ- (2-aminoethyl)
Aminopropyltrimethoxysilane, γ- (2-aminoethyl) aminopropylmethyldimethoxysilane, γ-
Aminopropyltriethoxysilane, N-phenyl-γ
-Aminopropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, γ-chloropropyltrimethoxysilane, γ-chloropropylmethyldimethoxysilane, octadecyldimethyl [3- (trimethoxysilyl) propyl ] ammonium chloride by Ri 1, which is selected
3. The superabsorbent polymer composition according to paragraph 1 or 2 , wherein the composition is at least one species. 4 . Oxalate compounds, potassium oxalate, sodium oxalate, is potassium oxalate titanate, sodium oxalate titanate, one or more members selected from the group consisting of ammonium oxalate titanate, 1 to Section
4. The superabsorbent polymer composition according to any one of items 3 . 5 . 5. The superabsorbent polymer composition according to any one of items 1 to 4 , wherein the superabsorbent polymer (A) is in the form of particles. About.

[0007]

The materials using the function of the present invention and the method for producing the superabsorbent polymer composition will be described sequentially.

<Superabsorbent Polymer> The superabsorbent polymer used in the present invention is a superabsorbent polymer having a cross-linked structure and having a carboxyl group and / or a carboxylate as a component of the polymer. Any material can be used, and the type of the polymer and the polymerization method are not limited. Among these superabsorbent polymers, crosslinked polyacrylate, crosslinked starch-acrylate graft copolymer, saponified starch-acrylonitrile graft copolymer, crosslinked acrylate-vinyl acetate copolymer Preferred examples include one or more selected from the group consisting of saponified products, crosslinked acrylate-acrylamide copolymers, and crosslinked polyacrylonitrile. In the present invention, in addition to the above, polyethylene oxide crosslinked with acrylic acid, crosslinked product of sodium carboxymethylcellulose, maleic anhydride-isobutylene copolymer compound,
Examples thereof include those obtained by copolymerizing acrylate with a comonomer such as maleate, itaconic acid salt, 2-acrylamide-2-methylsulfonic acid salt, 2-acryloylethanesulfonic 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 superabsorbent polymer as described above is generally prepared by polymerizing a polymerizable monomer having a carboxyl group and / or a carboxylate group such as acrylic acid (salt) or maleic anhydride (salt) with water and radical polymerization. It can be obtained by polymerization in the presence or absence of an initiator and a crosslinking agent by a known aqueous solution polymerization method, solution polymerization method, reverse phase suspension polymerization method, or the like. For example,
No. 25045, Japanese Patent Application No. 59-210198,
JP-A-57-158210, JP-A-57-214
No. 05, JP-B-53-46199, JP-A-5
8-71907, JP-A-55-84304, JP-A-56-91837, JP-A-2-49002, JP-A-61-157513, and JP-A-62-162.
It can be produced by the method described in 62807 and the like.

The cross-linking performed here indicates internal cross-linking of the superabsorbent polymer matrix, and differs from the cross-linking indicated by the surface treatment described later in terms of operation and content. That is, the crosslinking is to uniformly disperse the crosslinking agent in the polymer before or after the polymerization and to uniformly crosslink the inside of the polymer. On the other hand, this internal crosslinking includes so-called self-crosslinking derived from the polymerizable monomer itself due to heat during polymerization, for example, without using a crosslinking agent. As a method of using a cross-linking agent, for example, a cross-linking agent having two or more double bonds in the molecule and showing copolymerizability with the polymerizable monomer, or a functional group in the polymerizable monomer in the molecule is used. Those having two or more functional groups capable of reacting with a group, for example, a carboxyl group and / or a carboxylate group during a treatment such as drying during or after polymerization are exemplified. Examples of the former crosslinking agent include N, N-methylenebis (meth) acrylamide, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, and propylene glycol di (meth) acrylate. , Polypropylene glycol di (meth) acrylate, diallyl phthalate, diallyl maleate, diallyl terephthalate, triallyl cyanurate, triallyl isocyanurate, triallyl phosphate and the like. Examples of the latter crosslinking agent include ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, di- or polyglycidyl ethers of aliphatic polyhydric alcohols, and the like. Further, those having both functions of the former and the latter include, for example, N-methylolacrylamide, glycidyl methacrylate and the like.

The above superabsorbent polymer is generally obtained as a water-containing gel containing water after polymerization. Usually, the water-containing gel is dehydrated as it is or by azeotropic distillation with an inert solvent and finally dried. If necessary, pulverization / classification and the like are performed to obtain a product.

As the superabsorbent polymer used in the present invention, those obtained by subjecting a product to a surface modification treatment in the course of the above-mentioned production process or a product can be effectively used. The surface modification referred to in the present invention does not treat the inside of the superabsorbent polymer particles but means modifying the surface by hydrophobic modification.

The compounds used for surface modification include polyvalent metal compounds such as aluminum hydroxide and the following silane compounds. X (R) m Si (Y) 3-m (where X is a functional group capable of reacting with a carboxyl group and / or carboxylate group in the superabsorbent polymer, R is a hydrocarbon group, and Y is Represents a decomposable group, m represents 0, 1 or 2) Specifically, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, β- (3,4-epoxycyclohexyl) ) Ethyltrimethoxysilane, γ- (2-aminoethyl) aminopropyltrimethoxysilane, γ- (2-aminoethyl) aminopropylmethyldimethoxysilane,
γ-aminopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, γ-chloropropyltrimethoxysilane, γ-chloropropylmethyldimethoxy Silane, octadecyldimethyl [3- (trimethoxysilyl) propyl] ammonium chloride and the like. Examples of the polyvalent metal compound include divalent metal compounds such as Mg, Ca, Ba, and Zn, and trivalent metal compounds such as Al and Fe. Specific examples include magnesium sulfate, aluminum sulfate, ferric chloride, calcium chloride, and chloride. magnesium,
Aluminum chloride, polyaluminum chloride, iron nitrate, 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 10.0% by weight based on the polymer.

When the surface of the superabsorbent polymer particles is treated with these compounds, they react with the polymer on the surface, and these compounds bind to the surface and undergo hydrophobic denaturation to prevent adhesion of the particles and prevent water absorption. Can be increased. The average particle size of the superabsorbent polymer used in the present invention,
Usually, it is 10 to 2000 µ, preferably 50 to 1000 µ.

<Oxalate Compound> The oxalate compound used in the present invention includes all metal salts, double salts and organic compounds based on oxalic acid. Representative examples include sodium oxalate, potassium oxalate, ammonium oxalate, zinc oxalate, zinc potassium oxalate, aluminum oxalate, aluminum ammonium oxalate, aluminum sodium oxalate, antimony potassium oxalate, uranyl oxalate ,
Gerhard acid uranyl ammonium, potassium oxalate uranyl, calcium oxalate, silver oxalate, chromium oxalate, oxalic acid chromium potassium, cobalt oxalate, zirconium oxalate, oxalic acid mercury oxalate mercury ammonium, ammonium hydrogen oxalate, Potassium hydrogen oxalate, sodium hydrogen oxalate, barium hydrogen oxalate, tin oxalate, strontium oxalate, cesium oxalate, cerium oxalate, copper oxalate, iron oxalate,
Manganese oxalate, titanyl oxalate, titanyl oxalate ammonium, potassium oxalate, sodium oxalate, ammonium oxalate,
Rubidium titanate oxalate, iron ammonium oxalate, potassium iron oxalate, copper potassium oxalate, lead oxalate, nickel oxalate, potassium nickel oxalate,
Vanadium oxalate, barium oxalate, bismuth oxalate, beryllium oxalate, magnesium oxalate, manganese oxalate, lithium oxalate, aniline oxalate, oxalic amide, dimethyl oxalate, dimethyl oxalate, dinitrile oxalate, dihydrazide oxalate, oxalic acid Urea, hydroxyammonium oxalate, and the like. These oxalate compounds can be used alone or as a mixture of two or more. In the present invention, among these, in particular, one or a mixture of two or more selected from potassium oxalate, sodium oxalate, potassium oxalate titanate, and sodium oxalate titanate is particularly preferable. The amount of the oxalate compound used varies depending on the type, properties and average particle size of the superabsorbent polymer used, but is generally 0.05 to 10 parts by weight based on 100 parts by weight of the superabsorbent polymer. , Preferably 0.1 to 5 parts by weight. If the addition amount is less than 0.05% by weight, the effect of the addition is small, and if it exceeds 10 parts by weight, the improvement effect by the addition is small and the cost increases, which is not advantageous. Most of these oxalate compounds are in the form of powder at normal temperature / normal pressure, but when used as a powder, those having particularly fine average particle diameters are good, for example, preferably 10 μm or less, more preferably Is 1
μ or less is good.

<Production of superabsorbent polymer composition> The superabsorbent polymer composition of the present invention is prepared by uniformly adding a predetermined amount of the above oxalate compound to the above superabsorbent polymer and dispersing or dispersing it. It can be obtained by impregnation. Addition and dispersion or impregnation can be carried out by various conventionally known methods or means, but can be easily carried out by using a mixer used for general powder mixing or solid-liquid mixing. For example, a tank type mixer with a stirring blade, a tumbling type mixer, a flow type mixer, an air flow type mixer, a vibration type mixer, a high-speed rotary paddle machine and the like can be mentioned. Depending on the case, it may be added and dispersed or impregnated during the polymerization of the superabsorbent polymer, the aging operation, the dehydration step, the surface modification step, and the granulation step. The temperature at the time of addition dispersion or impregnation is from room temperature to 150 ° C., preferably from room temperature to 50 ° C.
° C is used. The composition of the present invention obtained in this manner has high gel strength, gel stability, and surface state even for body fluids such as human urine with large individual differences without impairing the original water absorption performance of the superabsorbent polymer. In such a case, it is simultaneously improved to a satisfactory level, so that it can be advantageously used for various applications.

[0017]

EXAMPLES The present invention will be described below in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples. Incidentally, the evaluation of the superabsorbent polymer composition, water absorption capacity, gel strength after water absorption, stability of the gel after water absorption,
The test was performed for "stickiness" of the gel surface. The respective measuring methods are shown below.

Water absorption capacity 1 g of the superabsorbent polymer is placed in a 250 mesh nylon bag (10 cm × 20 cm size) and immersed in 1 liter of artificial urine for 30 minutes. 30 minutes later,
Pull up the nylon bag, drain for 15 minutes, measure the weight,
After blank correction, the weight of the artificial urine absorbed by 1 g of the superabsorbent polymer was defined as the water absorption capacity. The composition of the artificial urine is shown below. Artificial urine composition Urea 1.94% Sodium chloride 0.80% Calcium chloride 0.06% Magnesium sulfate 0.11% Pure water 97.09%

Gel strength after water absorption 1 g of superabsorbent polymer absorbs 25 g of adult human urine (mixed with urine of 5 adults), and after standing at 25 ° C. for 30 minutes, the gel is subjected to a rheometer (Fudo Kogyo NRM-2002J type). In), the force at which the cell enters the gel was defined as the gel strength.

Stability of Gel after Water Absorption A sample similar to the one described above for the gel strength after water absorption was prepared and left in a thermostat at a set temperature of 40 ° C. for 16 hours. The gel strength after standing was measured, and the gel stability was determined after water absorption. The same measurement was performed five times on different days in consideration of individual differences in human urine and the like.

"Stackiness" of gel surface After the gel was measured for stability after water absorption, "stickiness" of the swollen gel was measured by touch. The determination of “stickiness” was made on a three-point scale of △ to △ to ×. : The swollen gel is quite “crisp” and has a dry feeling. Δ: The swelling gel is partially sticky. ×: The swollen gel is sticky, and the hands are sticky.

<Superabsorbent Polymer> In the examples and comparative examples described below, the following superabsorbent polymers were used.

Superabsorbent polymer ( a ) In a 5,000 ml four-necked round bottom flask equipped with a stirrer, a reflux condenser, a thermometer and a nitrogen gas inlet tube, 1210 g of cyclohexane was placed, and 9 g of sorbitan monostearate was added. Was added and dissolved, and nitrogen gas was blown in to expel dissolved oxygen. Separately, 350 g of acrylic acid was dissolved in 727.7 g of water in a beaker having a capacity of 2,000 ml while cooling with ice from the outside, and 143.1 g of 95% pure was dissolved.
Sodium hydroxide was added to neutralize 70% of the carboxyl groups. 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 0.37
g and 0.94 g of potassium persulfate were added to dissolve, and then nitrogen gas was blown in to expel the residual oxygen. The contents of the 2,000-ml beaker were added to the contents of the four-necked round-bottom flask, dispersed by stirring, and the inside temperature of the flask was raised by a water bath while bubbling nitrogen gas. After the temperature reached around 60 ° C., the internal temperature rose rapidly, and reached 75 ° C. after several tens of minutes. Next, the internal temperature was maintained at 60 to 65 ° C., and the reaction was carried out for 3 hours while stirring. The stirring was performed at 145 rpm. After the reaction for 3 hours, 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 adhering cyclohexane and water. As a result, 400 g of a smooth superabsorbent polymer was obtained. 100 g of the dried polymer thus obtained was placed in a 500 ml eggplant-shaped flask, and then 122.5 g of cyclohexane was added to form a slurry. The slurry is stirred with water 22.5
g is added to γ-glycidoxypropyltrimethoxysilane.
A liquid in which 44 g was dispersed was added, and the mixture was stirred at room temperature for 30 minutes. Next, the film was immersed in an oil bath at 105 ° C. for 30 minutes, and then evaporated to dryness under reduced pressure while maintaining the oil bath temperature, to obtain 95 g of a dry polymer.

Superabsorbent polymer ( b ) 100 g of 400 g of the superabsorbent polymer obtained in the superabsorbent polymer ( a ) was taken and added to a solution of 5 g of calcium nitrate, 80 g of ethyl alcohol and 10 g of water. At 25 ° C. for 5 minutes. Thereafter, filtration was performed, and the obtained powder was dried under reduced pressure at 90 ° C. for 3 hours to obtain 95 g of a dried polymer.

[0025] As Example 1-11 oxalate compound, oxalic acid, sodium oxalate, potassium oxalate, sodium oxalate titanate, potassium oxalate titanate, with oxalate titanate ammonium, these above-mentioned (a A predetermined amount was added to the superabsorbent polymer of ( b ) and ( b ), and the mixture was mixed at room temperature for 30 minutes using a V blender (S-5, manufactured by Tsutsui Physical and Chemical Instrument Co., Ltd.). Table 1 shows the conditions of the examples such as the amount of addition.

[0026]

[Table 1]

Comparative Example 1, 2 Oxalic acid (salt) compound without adding the above (a),
(b) Using a super absorbent polymer, these water absorption capacity,
Gel strength after water absorption, stability of gel after water absorption,
Was measured in the same manner as Comparative Example. Comparative Example 1 was high.
Water-absorbing polymer (a), 2 is (b)
You. Table 2 shows the superabsorbent polymers shown in Table 1 and Comparative Examples.
Water absorption capacity of composition, gel strength after water absorption, stability of gel after water absorption
Of the properties and the "stickiness" of the gel surface
showed that. The stability of the gel after water absorption and the "stickiness" of the gel surface
As for “with”, the results of five tests are shown with different urine collection dates.
did. As is evident from the results shown in Table 2,
The superabsorbent polymer composition in Ming is a superabsorbent polymer.
-Great water absorption gel strength without impairing the original water absorption performance
Gel for human urine with large individual variation
Qualitative and gel surface "stickiness" is definitely improved
You can see that

[0028]

[Table 2]

(Note) RUN indicates each of the five tests. -* The swollen gel becomes semi-fluid, indicating that measurement is impossible.

[0030]

EFFECTS OF THE INVENTION The superabsorbent polymer composition according to the present invention has a gel strength after water absorption even when a body fluid such as human urine having a large individual difference is absorbed without impairing the original water absorbing performance of the superabsorbent polymer. Is greatly improved, and at the same time, the stability of the gel over a long period of time and the tackiness of the gel surface are also greatly improved. Therefore, the superabsorbent polymer composition according to the method of the present invention can be suitably used not only as sanitary materials such as disposable diapers, sanitary napkins, and various pads, but also for agricultural and horticultural uses, industrial uses, and the like.

Continuation of the front page (56) References JP-A-1-210463 (JP, A) JP-A-1-223161 (JP, A) JP-A-6-88069 (JP, A) (58) Fields investigated (Int) .Cl. ⁷ , DB name) C08L 1/00-101/16 C08K 3/00-13/08

Claims (5)

(57) [Claims] 1. A has a crosslinked structure, and it because superabsorbent polymers containing carboxyl groups and / or carboxylate groups as constituents of polymer (A) and oxalate salt compound (B), the high Water-absorbing polymer (A)
Polyvalent metal compounds such as aluminum oxide and the following silane compounds
The surface of the polymer has been modified by
Ri, X (R) m Si ( Y) 3-m ( wherein, X is and carboxyl groups in the superabsorbent polymer
And / or a functional group capable of reacting with a carboxylate group is represented by R
Y represents a hydrolyzable group, m represents 0, 1 or
2) and (A) 100 parts by weight of (B) 0.05 to 1
A superabsorbent polymer composition having a mixing ratio of 0 parts by weight. 2. A highly water-absorbing polymer (A) having a crosslinked structure and containing a carboxyl group and / or a carboxylate group as a constituent of the polymer is a crosslinked product of polyacrylate and starch-acrylate. Graft copolymer crosslinked product,
Hydrolysates of starch-acrylonitrile graft copolymer cross-linked products, acrylate-vinyl acetate copolymer cross-linked products, acrylate-acrylamide copolymer cross-linked products, and polyacrylonitrile cross-linked hydrolysates, etc. The superabsorbent polymer composition according to claim 1, wherein the composition is one or more selected from the group consisting of: 3. The silane compound is γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ- (2-amino Ethyl) aminopropyltrimethoxysilane, γ- (2
-Aminoethyl) aminopropylmethyldimethoxysilane, γ-aminopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, γ-chloropropyl trimethoxysilane, .gamma.-chloropropyl methyl dimethoxy silane, is octadecyl dimethyl [3- (trimethoxysilyl) propyl] one or more selected Ri by ammonium chloride, superabsorbent as claimed in claim 1 or 2 Polymer composition. 4. An oxalate compound comprising potassium oxalate, sodium oxalate, potassium oxalate titanate,
The superabsorbent polymer composition according to any one of claims 1 to 3, wherein the composition is at least one member selected from the group consisting of sodium oxalate titanate and ammonium oxalate titanate. 5. A superabsorbent polymer (A) is a particulate, claims 1 to superabsorbent polymer compositions according to any one of 4.