JP4572108B2 - Pet toilet sand - Google Patents

Description

  The present invention relates to pet litter, and more particularly relates to pet litter that carries a fragrance and has excellent deodorizing properties against bad odors and odors.

  Clay minerals that exhibit water swellability such as bentonite are widely used as toilet sand for pets because they can treat urine as a solid material, but they have a sufficient deodorizing effect against bad odors and off-flavors originating from ammonia, etc. There is a problem that is not. For this reason, it is conceivable to carry perfume on toilet sand, but when perfume is carried on water-swellable clay minerals such as bentonite, the perfume is gradually released, showing sustained release of the perfume. It is effective in terms of spreading fragrance over a long period of time, but it does not emit much fragrance during actual use (hereinafter referred to as excretion of manure or simply during excretion) when it emits the most bad odor. Odor effect is not enough.

For this reason, in Patent Document 1, instead of water-swellable clay minerals, pet litter (pet excrement treatment agent) for pets in which zeolitic particles having high adsorptivity are used and a fragrance is supported on the zeolite particles is disclosed. Proposed.
JP 2000-236766

  That is, the toilet sand of Patent Document 1 adsorbs malodorous components such as ammonia by zeolite particles and at the same time has a high deodorizing function due to the fragrance emitted by the fragrance. There is a problem in that the solidification function is impaired and the disposability becomes unsatisfactory.

  Therefore, the object of the present invention is to continuously show a deodorizing property against bad odor or strange odor against ammonia or the like, exhibiting a high deodorizing property particularly during excrement, and further having a solidifying function due to water swelling performance. The object is to provide toilet sand for perfume-carrying pets.

According to the present invention, the water-swellable clay mineral component has an apex in the region of 2θ = 21.5 to 22.5 °, and the half width (2θ / °) is 0.40 to 0.80 °. A granular material containing an opal component having an X-ray diffraction peak, and the granular material carries a fragrance ,
The granular material comprises the water-swellable clay mineral component and the opal component represented by the following formula:
R _A = S _O × W _O / (S _S × W _S )
In the formula, S 2 _O has a vertex in the region of 2θ = 21.5 to 22.5 ° of the opal component.
The maximum intensity (cps) of the X-ray diffraction peak from the [111] plane,
W _O is the half width (2θ / °) of the X-ray diffraction peak due to the [111] plane,
S _S is apex in the region of 2θ = 19.0 to 20.5 ° of the water-swellable clay mineral component.
The maximum intensity (cps) of the X-ray diffraction peak from the [020] plane having
W _S is the half width (2θ / °) of the X-ray diffraction peak by the [020] plane.
The toilet sand for pets is provided, wherein the _RA value defined in the above is contained in a ratio of 3.5 to 10.0 .

In the pet toilet sand of the present invention,
(1) the granular material is a BET specific surface area of ^{65 m} 2 / g or more, the pore volume pore size determined by the BJH method in the area of 50~3000Å is 10 cm ^3/100 g or more and a pore diameter of 17 it pore volume in 50Å region is ^{3 cm} 3/100 g or more,
(2) The water-swellable clay mineral component is made of dioctahedral smectite, and the opal component is made of opal A or opal CT.
Is preferred.

  In the present invention, it is an important feature that the granular material carrying the fragrance contains an opal component in addition to the water-swellable clay mineral component. That is, since this granular material contains a water-swellable clay mineral component, it has a solidifying function due to water swelling, and thus can be solidified by excrement and easily discarded.

  The water-swellable clay mineral component has a layered structure and has relatively small pores. Therefore, when a fragrance | flavor is carry | supported by this granular material, a fragrance | flavor is hold | maintained in the interlayer and small pore in a water-swellable clay mineral component, and this fragrance | flavor is discharge | released outside gradually. Due to such sustained release of the fragrance, a deodorizing function is exhibited over a long period of time.

Further, the opal component having 2θ having an X-ray diffraction peak in a predetermined region is a component derived from a SiO ₂ crystal such as cristobalite or tridymite, and opal A (the X-ray diffraction peak is relatively broad and the degree of amorphousness is Large) and opal CT (mixed crystal of cristobalite and tridymite). Such an opal component does not have water swellability derived from a layered structure like the water-swellable clay mineral component, but has relatively large pores, and a fragrance is retained in the pores. Is done. That is, the fragrance | flavor hold | maintained in such a big pore is easily substituted with water (urine, the water | moisture content of feces) at the time of excrement. Therefore, a fragrance | flavor is diffused at a stretch at the time of manure, As a result, the malodor at the time of manure can be deodorized effectively.

  Thus, the pet litter of the present invention has a solidifying function due to water swelling property, and is easy to dispose of, as well as ammonia, amines, mercaptans, etc. generated from manure in the layers and small pores of clay mineral components In addition to being able to deodorize by adsorbing malodorous odor components (bad odor adsorption effect), it also has excellent sustained release of fragrances, lasting for a long time and showing deodorizing properties. It is possible to effectively deodorize by masking a remarkable bad odor at the time with a fragrance (bad odor masking effect).

  The pet litter for pets of the present invention is obtained by supporting a fragrance on a granular material having a water-swellable clay mineral component and an opal component.

The water-swellable clay mineral component in the granular material is derived from, for example, dioctahedral smectite, and an AlO ₆ octahedral layer (or FeO ₆ octahedral layer) is sandwiched between two SiO ₄ tetrahedral layers. The layer structure is a basic layer unit, and the basic layer unit is stacked in the c-axis direction. In addition, Al in the AlO ₆ octahedral layer is partially isomorphously substituted with Mg or Fe ^(II) , and part of Si in the SiO ₄ tetrahedral layer is isomorphously substituted with Al or Fe ^(III) . Metal cations (for example, Na ions) exist between layers between the basic layer units stacked in the c-axis direction so as to compensate for the lack of positive charge due to isomorphous substitution. Such dioctahedral smectite is thought to have been generated by the modification of volcanic ash, lava, etc. under the influence of seawater, and includes montmorillonite, beidellite, nontronite, etc. in the clay mineral classification. Clays containing as the main mineral component include so-called acid clay and bentonite.

  The clay having such a dioctahedral smectite as a main component has a property of swelling and solidifying when water is taken in between the layers of the basic layer unit described above. Bentonite or activated bentonite containing a large amount of Na ions and having the largest water swelling function is preferable.

  The water-swellable clay mineral component described above has a layered structure as described above, and further has relatively small pores. Some of the fragrances described below may include layers between the basic layer units or small pores. Stably held inside. Such a fragrance is gradually released, and therefore, an appropriate deodorizing property can be secured over a long period of time.

In addition, the opal component that coexists with the above water-swellable clay mineral component shows a peak having an apex in the region of 2θ = 21.5 to 22.5 ° in the X-ray diffraction (CuKα) measurement. Such components are derived from SiO ₂ crystals such as cristobalite and tridymite, and the X-ray diffraction peak is due to the [111] plane of the crystals. Furthermore, the opal component that is effectively used in the present invention has a large half-value width (2θ / °) of the X-ray diffraction peak of 0.40 to 0.80, and is derived from an amorphous or microcrystalline material. is there. Such an opal component does not exhibit any water swellability, but has a characteristic of having large pores as compared with the water-swellable clay mineral component, and a part of the fragrance is retained in the pores. . The fragrance | flavor hold | maintained in this way is substituted by water (urine, the water | moisture content of feces) at the time of excrement, and is diffused to the exterior at a stretch. Therefore, the remarkable bad odor at the time of excrement is effectively deodorized by the sudden release of such a fragrance.

In the present invention, the above-described water-swellable clay mineral is naturally produced in various places, but in some areas, it is produced together with the above opal components. For example, water-swellable clay minerals such as bentonite produced in some areas often contain crystalline opal C to α-cristobalite, and the half width of the X-ray diffraction peak is less than 0.40. pore volume pore size determined by the BJH method in the area of 50~3000Å also is smaller and less than 10 cm ^3/100 g. On the other hand, water-swellable clay minerals such as bentonite produced in some specific areas are composed of a mixed crystal of opal A or cristobalite and tridymite which is relatively amorphous (showing a relatively broad X-ray diffraction peak). There are some which are produced together with microcrystalline opal CT, and the half-value width of these X-ray diffraction peaks is as large as 0.40 to 0.80, and the pore volume for retaining the fragrance (BJH method pore diameter = 50 to 3000 mm) ) also it is larger and 10cm ³ / 100g or more. This can be activated by alkali treatment as necessary, and pulverized, classified, or molded to a predetermined particle size and used as a granular material in the present invention. In the present invention, a rare clay mineral such as the latter is selected and collected, and it is possible to exhibit an excellent deodorizing function by using it while containing such an opal component.

Moreover, it is preferable that the granular material used in the present invention is generally prepared so that the specific surface area by the BET method is 65 m ² / g or more. That is, if the specific surface area is too small, the ability to adsorb malodorous components of manure is reduced, and the deodorizing property that should be inherent may be reduced. This BET specific surface area is caused by the presence of fine pores having a pore diameter of 300 mm or less, and the fine pores produced in the water-swellable clay mineral interlayers and the aggregates of layered particles are 2θ = 21.5-22.5 °. The X-ray diffraction peak half-width (2θ / °) in this region is considered to be due to the presence of fine pores formed in the aggregate of low crystalline opal components having a range of 0.40 to 0.80 °.

Furthermore, the granules used in the present invention, the ratio between the water-swellable clay mineral component and opal component is within a predetermined range. That is, if the content of the opal component is more than necessary, the solidification function due to water swellability, which is the basic performance of the toilet sand of the present invention, is greatly reduced, and the content of the opal component is less than necessary. This is because the perfume retention function by the opal component is lowered, the desired deodorizing function is lowered, and the deodorizing function against remarkable bad odor particularly in manure is lowered. The ratio of the water-swellable clay mineral component and the opal component can be determined by utilizing the fact that the water-swellable clay exhibits a characteristic X-ray diffraction peak. For example, the following formula:
R _A = S _O × W _O / (S _S × W _S )
In the formula, S 2 _O is the maximum intensity (cps) of the X-ray diffraction peak due to the [111] plane having an apex in the region of 2θ = 21.5 to 22.5 ° of the opal component,
W _O is the half width (2θ / °) of the X-ray diffraction peak due to the [111] plane,
S _S is the maximum intensity (cps) of the X-ray diffraction peak by the [020] plane having an apex in the region of 2θ = 19.0 to 20.5 ° of the water-swellable clay mineral component,
W _S is the half width (2θ / °) of the X-ray diffraction peak by the [020] plane.
R _A value defined in the at a rate in the range of 3.5 to 10.0 and contains a water-swellable clay mineral component and opal component. That is, the numerator term (S _O × W _O ) in the above formula is a parameter indicating the amount of the opal component (in the examples described later, indicated as S _O × W _O = A _O ), and the denominator term ( _S S × _W S) is a parameter indicative of the amount of water swelling clay mineral component (in the examples to be described later shown by _{S S × W S = a S} ). Therefore, when the _RA value is larger than the above range, the amount of the opal component is small and the deodorizing function tends to be lowered. When the _RA value is smaller than the above range, the water-swellable clay mineral component is There is little, and there exists a tendency for the deodorizing performance which should have and the solidification function by water swelling to fall.

Since the raw material composition of the granular material used in the present invention has a water-swellable clay mineral component and an opal component as described above, it has a large amount of SiO ₂ and usually has the following composition.
SiO ₂ : 65 to 75% by weight
Al ₂ O ₃ : 10 to 20% by weight
MgO: 2 to 4% by weight
CaO: 1 to 3% by weight
Na ₂ O: 2 to 4% by weight
Other oxides: 0 to 1% by weight
Burning loss: 5 to 8% by weight

  The granular material used in the present invention contains a water-swellable clay mineral component and an opal component. For example, a raw earth having the above composition is pulverized, classified to a predetermined particle size, extruded, or the like. Is obtained by molding into a predetermined particle shape. In addition, this granular material generally has a minor axis of 0.5 to 8 mm and an aspect ratio in the range of 1 to 20 in terms of moisture absorption, consolidation or solidification, and handling of the solid. In addition, the shape of the granular material is not particularly limited, and may be any of a spherical shape, a cubic shape, a cylindrical shape, a prismatic shape, a granular shape, a tablet shape, and an indefinite shape.

Moreover, since this granular material contains the water-swellable clay mineral and the opal component described above, the pore volume (mainly derived from the opal component) in the region where the pore diameter is 50 to 3000 mm by the BJH method is 10 cm ^3. / 100g or more, the range of particularly 12 to 20 cm ³ / 100g, and the pore size (from water-swelling clay mineral) pore volume in the region of 17~50Å is ^{3 cm} 3 / 100g or more, particularly 4 to 10cm It is in the range of ³ / 100g. That is, the small-diameter pores are effective for the sustained release of the fragrance, and the large-diameter pores easily release the fragrance.

  In the present invention, a perfume is supported on the above-mentioned granular material in an appropriate amount, and a desired deodorizing function is imparted by the fragrance of the perfume. As such a fragrance, any one having a desired fragrance can be used. For example, rose oil, lavender oil, jasmine oil, buttery oil, carnation oil, lemon oil, orange oil, Essential oils such as lemongrass oil, bergamot oil, bechuba oil, clove oil, zedaan oil, sandalwood oil, eucalyptus oil, casscha oil, camphor oil, ylang ylang oil, citronella oil, geranium oil, musk, civet oil, sea urchin fragrance, amber Examples include one or more animal flavors such as grease oil, and synthetic flavors such as vanillin, methyl salicylate, cinnamylaldehyde, β-phenylethyl alcohol, geraniol, oxycitronellal, phenylacetaldehyde, piperonal, and the like. it can.

  The perfume can be easily carried out by spraying the perfume onto the granular material by spraying or the like. This allows the perfume to permeate and hold between the above-mentioned water-swellable clay mineral components or between small pores. At the same time, the perfume penetrates and is retained in the large pores of the opal component, thereby imparting a sustained release property and an easy release property of the perfume. It is possible to ensure the deodorizing property due to the fragrance due to the sudden release. In addition, depending on the kind of fragrance | flavor, a fragrance | flavor can be carry | supported by spraying and drying using water and an organic solvent suitably.

  Moreover, in this invention, antibacterial property can also be provided by making a copper compound and a silver compound adhere to the particle | grain surface to the said granular material as needed. Examples of such copper compounds include inorganic salts such as copper sulfate, copper nitrate, basic copper sulfate, basic copper sulfate calcium salt (Bordeaux liquid), copper chloride and copper carbonate, and organic salts such as copper dicarboxylate. In particular, it is preferably a water-soluble salt in that it can be easily attached to the surface of the ammonia-adsorbing granular material, and copper sulfate can be easily obtained at a low cost. Most preferred. The silver compound can be used in various forms such as a salt such as silver nitrate, a halide such as silver chloride, and other hydroxides, oxides, complexes, etc., but can be easily attached. In view of this, it is preferable that it is water-soluble, and silver nitrate is most preferable because it is easily available. Such a copper compound or silver compound may be used in an amount that does not impair the fragrance of the fragrance. For example, the copper compound or the silver compound is attached to the surface of the granular material in an amount of about 0.5 to 5000 ppm per granular material. Can be made. This attachment can be easily performed by spraying or the like, similarly to the fragrance.

  Incidentally, the pet toilet sand of the present invention comprising the above-mentioned perfume-carrying granular material is, for example, natural zeolite or synthetic zeolite granular product, river sand, silica gel, newspaper, paper sludge molded product, large sawdust, Kanuma soil (Allophane) ) It can also be used in combination with 1 to 10 mm granular pulp or granulated paper.

The present invention will be specifically described with reference to examples.
Each measurement method and test method in the following examples are as follows.

X-ray diffraction X-ray diffraction was performed by the following apparatus and conditions.
X-ray diffractometer: manufactured by Rigaku Corporation, MultiFlex (Cu-Kα)
Tube voltage: 40 kV
Tube current: 30 mA
Divergent slit: 0.15 mm
Scattering slit: 1 °
Receiving slit: 0.3mm

[Half width]
The peak having an apex in the region of 2θ = 21.5-22.5 of the opal component obtained by the X-ray diffraction condition and the apex in the region of 2θ = 19.0-20.5 ° of the water-swellable clay mineral component Using the basic data processing software for MultiFlex manufactured by Rigaku Corporation, [Smoothing], [Background removal] and [Kα2 removal] are performed on the peaks having The price range was determined.

[ _RA value]
As shown in the following formula, the maximum intensity (S _O ) of the X-ray diffraction peak due to the [111] plane having an apex in the region of 2θ = 21.5-22.5 ° of the opal component is the half width (W _{O of the} peak). ) Multiplied by (S _O × W _O = A _O ), the X-ray diffraction peak of the [020] plane having an apex in the region of 2θ = 19.0 to 20.5 ° of the water-swellable clay mineral component. A numerical value obtained by dividing the maximum intensity (S _S ) by the half width (W _S ) of the peak (S _S × W _S = A _S ) was obtained as the _RA value.
(S _O × W _O ) ÷ (S _S × W _S ) = A _O ÷ A _S = R _A

(2) Specific surface area / pore volume Measured using an automatic specific surface area / pore distribution measuring device (TriStar 3000, measurement method: gas adsorption method by a constant volume method) manufactured by Micromeritex.

[BET specific surface area]
From the nitrogen gas adsorption isotherm, the multipoint specific surface area by the BET method was determined.

[BJH method pore volume]
From the nitrogen gas desorption isotherm, the pore distribution by the BJH method was expressed as a cumulative amount, and the range value of the pore volume in the region where the pore diameter was 17 to 50 mm or 50 to 3000 mm was determined.

(3) Deodorization (odor adsorption rate)
[Ammonia adsorption rate]
A 100 g granular sample is taken into a 1800 ml glass bottle and sealed with a lid with a rubber inlet. After pouring 1 ml of 1.4 (weight / volume)% aqueous ammonia with a microsyringe and placing it at room temperature (20-25 ° C.) for 20 minutes, the residual ammonia concentration (appm) in the gas in the glass bottle was determined. It calculated | required with the gas detection pipe | tube (made by Gastec Co., Ltd.).
At the same time, the residual ammonia concentration (bppm) was obtained when the sample was not put in a glass bottle and the same operation as described above was performed (blank test). As sought.
Ammonia adsorption rate (%) = (ba) / b * 100

[Mercaptan adsorption rate]
A 100 g granular sample is taken into a 1800 ml glass bottle and sealed with a lid with a rubber inlet. To this, 1 ml of 0.008 (weight / volume)% ethyl mercaptan-ethanol solution was poured with a microsyringe and left at room temperature (20-25 ° C.) for 5 minutes, and then the residual concentration of mercaptan in the gas in the glass bottle ( cppm) was determined with a gas detector tube (manufactured by Gastec Corporation).
Further, at the same time, the residual ammonia concentration (dppm) was obtained when the sample was not put in a glass bottle and the same operation as described above was performed (blank test), and the mercaptan adsorption rate (%) was obtained by the following formula. .
Mercaptan adsorption rate (%) = (d−c) ÷ d × 100

(4) Deodorant (Odor masking effect)
Immediately after the end of the deodorization test, 6 hours and 24 hours later, 100 ml of the gas in the glass bottle was sampled with a syringe and poured into an empty glass bottle sealed with a 1800 ml rubber lid with a rubber inlet. After a minute, a sensory test was performed on the gas that naturally escaped when the lid was gently taken off, and the deodorizing property was evaluated as a malodor masking effect according to the following criteria.
◎ Little or no ammonia odor (or mercaptan odor) is felt, a moderately strong aromatic odor is felt, and the bad odor masking effect is extremely high.
○ Ammonia odor (or mercaptan odor) is hardly felt, a weak aromatic odor is felt, and the masking effect of bad odor is sufficient.
[Delta] Ammonia odor (or mercaptan odor) is felt weak and aromatic odor is slightly felt, but the masking effect of malodor is insufficient.
X Ammonia odor (or mercaptan odor) is felt weak, but there is little or no aromatic odor, and there is almost no malodor masking effect.

Example 1
A required amount of sodium carbonate was added to bentonite produced in Niigata Prefecture A, activated by a conventional method, granulated by an extrusion method, and dried to obtain a so-called activated bentonite granule (3 mmφ).
About 2 g of the obtained granular material was pulverized with a mortar, and the half-width, _RA value, BET method obtained by passing the passing powder of the 200 mesh sieve through an X-ray diffractometer and a specific surface area / pore distribution measuring device. Table 1 shows the measurement results of the specific surface area and the BJH method pore volume.
Next, 5 kg of the granular material is placed in a 300 × 400 mm PE / PA bag, and the part below the upper end of the opening is heat-sealed with the plastic bag slightly inflated. As a fragrance, put 0.5 g of a prepared fragrance sample (Fragrance TIC / D-03.250, manufactured by Takasago Fragrance Industry Co., Ltd.) into a venous syringe (with a needle), and puncture the tip of the needle near the seal part of a plastic bag. Put it in, pour it in and gently swirl it by hand. The part where the needle was stabbed was closed with a cellophane tape and allowed to stand for 7 days in an airtight state.
Table 1 shows the results of deodorizing and deodorizing tests performed on the granular material carrying the obtained fragrance.

Example 2
Almost the same operation as in Example 1 was carried out except that subbentonite from Niigata Prefecture B area was used instead of Bentonite from Niigata Prefecture A area, and a granular material carrying the fragrance of the present invention was obtained.
Table 1 also shows the measurement results of the full width at half maximum, the _RA value, the BET method specific surface area and the BJH method pore volume, and the deodorization and deodorization test results.

Example 3
The same operation as in Example 1 was carried out except that acid white clay produced in Niigata Prefecture C area was used instead of bentonite produced in Niigata prefecture A, and the required amount of sodium hydroxide and sodium carbonate were added and activated. A granular material carrying a fragrance was obtained.
Table 1 also shows the measurement results of the full width at half maximum, the _RA value, the BET method specific surface area and the BJH method pore volume, and the deodorization and deodorization test results.
Since the granular materials of Examples 1 to 3 have a preferable half-width, _RA value, BET specific surface area, and BJH method pore volume, retention and release (release) of the supported fragrances. Was moderately controlled, and combined with the inherent deodorizing property, showed excellent deodorizing properties due to the odor masking effect by the fragrance of the fragrance.

Comparative Example 1
Almost the same operation as in Example 1 was carried out except that subbentonite from Niigata Prefecture D area was used instead of Bentonite from Niigata Prefecture A area, and a granular material carrying a fragrance was obtained.
Table 1 also shows the measurement results of the full width at half maximum, the _RA value, the BET method specific surface area and the BJH method pore volume, and the deodorization and deodorization test results.

Comparative Example 2
Almost the same operation as in Example 1 was carried out except that subbentonite produced in Liaoning Province, China, was used instead of bentonite produced in the A area of Niigata Prefecture, to obtain a granular material carrying a fragrance.
Table 1 also shows the measurement results of the full width at half maximum, the _RA value, the BET method specific surface area and the BJH method pore volume, and the deodorization and deodorization test results.

Comparative Example 3
Commercially available pet litter (granular material) made of bentonite powder produced in Yamagata Prefecture by granulation by extrusion and dried. A perfume was supported on this in the same manner as in Example 1 to obtain a granular material.
Table 1 also shows the measurement results of the full width at half maximum, the _RA value, the BET method specific surface area and the BJH method pore volume, and the deodorization and deodorization test results.

Reference example 1
About the activated bentonite granular material (with no fragrance added) before carrying the fragrance in Example 1, measurement results of half width, _RA value, BET method specific surface area and BJH method pore volume, and deodorization and deodorization The test results are shown in Table 1 as reference examples (blanks).

FIG. 2 is an X-ray diffraction pattern of the powder obtained by pulverizing the granular material of Example 1, wherein two peaks of the symbol [S] are [001] of dioctahedral smectite which is a water-swelling clay mineral component from the low angle side. The [O-CT] peak is a diffraction peak due to the opal CT or opal A [111] plane, which is an opal component. It is an X-ray diffraction pattern of the powder obtained by pulverizing the granular material of Comparative Example 1. The two peaks of the symbol [S] are derived from the same as in FIG. 1, and the peak of the symbol [O-C] is Opal C, which is an opal component, is a diffraction peak due to the [111] plane of α-cristobalite, and the peak of the symbol [Q] is a diffraction peak based on the impurity quartz.

Claims (3)

A water-swellable clay mineral component and an X-ray diffraction peak having an apex in the region of 2θ = 21.5 to 22.5 ° and a half width (2θ / °) of 0.40 to 0.80 ° It consists of a granular material containing an opal component, and the granular material carries a fragrance ,
The granular material comprises the water-swellable clay mineral component and the opal component represented by the following formula:
R _A = S _O × W _O / (S _S × W _S )
In the formula, S 2 _O has a vertex in the region of 2θ = 21.5 to 22.5 ° of the opal component.
The maximum intensity (cps) of the X-ray diffraction peak from the [111] plane,
W _O is the half width (2θ / °) of the X-ray diffraction peak due to the [111] plane,
S _S is apex in the region of 2θ = 19.0 to 20.5 ° of the water-swellable clay mineral component.
The maximum intensity (cps) of the X-ray diffraction peak from the [020] plane having
W _S is the half width (2θ / °) of the X-ray diffraction peak by the [020] plane.
_A toilet litter for pets, characterized in that it is contained at a ratio such that the _RA value defined in (3 ) is in the range of 3.5 to 10.0 . The granulate is a BET specific surface area of ^{65 m} 2 / g or more, the pore volume pore size determined by the BJH method in the area of 50~3000Å is 10 cm ^3/100 g or more and a pore diameter of 17~50Å region pet litter according to claim 1 pore volume is ^{3 cm} 3/100 g or more at. The pet toilet sand according to claim 1 or 2 , wherein the water-swellable clay mineral component is composed of dioctahedral smectite, and the opal component is composed of opal A or opal CT.

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