JP2015117205A - Dentifrice composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dentifrice composition which can keep the surface of teeth smooth effectively by exhibiting a high dental plaque removing ability or a high stain removing ability, while giving a moderate feeling of granules without damaging teeth.SOLUTION: The invention provides a dentifrice composition containing component (I): 2 mass% or more to 40 mass% or less of granules comprising a water-insoluble powder material (A) and an inorganic binder (B); as well as component (II): 3 mass% or more to 15 mass% or less of abrasive powders selected from heavy calcium carbonate, zeolite, and the abrasive silica with RDA value of 160 or less and mean particle diameter of 1 μm or more to 15 μm or less. In component (I), the average value of the ratio (S/S) of the area (S) of a projected plane of the granules to the area (S) of the circumscribed circle whose diameter is the maximum diameter (D) in the projected plane is 0.5 or more to 0.9 or less, and the collapse strength is 1 gf/piece or more to 20 gf/piece or less.

Description

  The present invention relates to a dentifrice composition.

  In recent years, a dentifrice containing granules that can efficiently remove dental plaque causing causative teeth and periodontal disease and feel the effect thereof is known. These granules are substantially spherical agglomerated particles so as not to damage the enamel and gums on the tooth surface, and contain functional materials such as drugs, enzymes, and abrasives. There are things that aim at the visual effect.

  Conventionally, such granules containing various water-insoluble materials and binders are known. For example, Patent Document 1 contains abrasive powders, water-insoluble inorganic binders, and water-insoluble fibers such as cellulose. However, the dentifrice containing granules having a disintegration strength of 1 to 20 g / piece improves the plaque removal effect and the colored stain removal effect. Also in Patent Document 2, the use of these granules and an abrasive together improves the effect of removing plaque and the effect of removing coloration. In Patent Document 3, an abrasive having a low Mohs hardness is used together. It aims at the effect which does not hurt a tooth. On the other hand, Patent Document 4 describes a dentifrice containing granules having an uneven surface with an average height difference of 2 to 10 μm formed on the surface.

JP 2009-242241 A Japanese Patent Laid-Open No. 2006-69983 JP 10-316547 A JP 2011-11998 A

  However, the granule described in Patent Document 4 is produced by a spray granulation method in which the irregular surface formed on the surface is extremely fine and the shape of the granulated product can be made almost spherical. Since the shape of the whole granule is spherical, it is almost spherical as in the granules described in Patent Documents 1 to 3. When these spherical granules collapse at once when a load is applied from the toothbrush, depending on how the toothbrush is used and the brushing time, it is possible to remove even the dirt adhering to the minute recesses such as the frequency bands of the teeth. On the other hand, it is also desired to maintain a smooth feel on the surface of the tooth after removing the dirt as an effect of the dentifrice, and the realization of a dentifrice that can satisfy both of these is expected. ing.

  Therefore, the present invention makes it possible to recognize that the granules gradually disappear while brushing teeth because it gradually disintegrates while providing an appropriate granular feeling, and exhibits high plaque removing ability or dirt removing ability, The present invention relates to a dentifrice composition that can effectively maintain a smooth feel on the surface of the toothbrush.

  Therefore, the present inventors use a specific amount of a granule having a specific shape or a specific particle size distribution and having a specific disintegration strength and a specific abrasive powder having a low RDA value in a specific amount. Gradually disintegrate the granules present in the product, allowing the user to recognize that the granules are gradually disappearing, and not only can provide a moderate granular feeling, but these granules are accompanied by various shapes However, it effectively transmits the load from the toothbrush to the minute recesses of the tooth, and in combination with the abrasive powder, it exhibits high plaque removal ability or dirt removal ability while giving a smooth feel to the tooth surface. It has been found that a dentifrice composition can be obtained.

That is, the present invention comprises the following components (I) and (II):
(I) Water-insoluble powder material (A) and granules containing inorganic binder (B) 2 mass% to 40 mass%, and (II) heavy calcium carbonate, zeolite, and RDA value is 160 or less, And containing 3% by mass or more and 15% by mass or less of abrasive powder selected from abrasive silica having an average particle size of 1 μm or more and 15 μm or less,
In component (I), the ratio (S _A / S _S ) of the area (S _A ) of the projection surface of the granule to the area (S _S ) of the circumscribed circle whose diameter is the maximum passing diameter (D _L ) on the projection surface ) Is an average value of 0.5 or more and 0.9 or less, and the dentifrice composition has a disintegration strength of 1 gf / piece or more and 20 gf / piece or less.

  According to the dentifrice composition of the present invention, the granule (I) having a specific shape or a specific particle size distribution and a specific disintegration strength and showing a behavior of gradually disintegrating as a load is applied is contained in a specific amount. Therefore, the shape of the granule changes with time while having a good granular feeling without foreign material feeling. For this reason, the granules collide with the tooth surface with various shapes and penetrate into fine concave portions of about 50 μm, such as the frequency of teeth, so that the specific abrasive powder (II) having a low RDA value. Together with this, the load from the toothbrush can be effectively transmitted to sufficiently remove dirt such as plaque and colored dirt. Moreover, while smooth removing the dirt on the tooth surface and demonstrating high dirt removing ability, the smooth feel that is smooth on the tooth surface can be satisfactorily maintained, resulting in a high feeling of use.

By laser diffraction / scattering particle size distribution measurement of the pre-combination granule A ′ used to obtain the granule A contained in the dentifrice of Example 1 and the granule A contained in the dentifrice of Example 1 It is a graph which shows a particle size distribution. 2 is a SEM photograph of granules A contained in the dentifrice of Example 1. It is a graph which shows the particle size distribution by the laser diffraction / scattering type particle size distribution measurement of the granule B contained in the dentifrice of the comparative example 2.

Hereinafter, the present invention will be described in detail.
The dentifrice composition of the present invention comprises a granule (I) having a specific shape or a specific particle size distribution and having a specific disintegration strength in an amount of 5% by mass to 40% by mass, and a specific RDA value and average particle size. 3 to 15% by mass of the abrasive powder (II) having The dentifrice composition of the present invention is a combination of these granules (I) and abrasive powders (II), so that it removes dirt on the tooth surface and removes the dirt from the roots, while exhibiting high dirt removing ability. It has a feeling and can maintain a smooth feeling that is smooth on the tooth surface. Here, the smooth feel on the surface of the teeth means that when the tooth surface is touched with the tongue, there is no feeling of plaque or dirt adhering to the surface of the teeth. The feeling that can be slid.

  The dentifrice composition of the present invention contains granules (I) having a specific shape or a specific particle size distribution and having a specific disintegration strength. The granule (I) is a granule containing a water-insoluble powder material (A) and an inorganic binder (B), and the granule to be blended in the dentifrice composition in order to contain the granule (I) in the dentifrice composition Is also referred to as “pre-blend granule” hereinafter.

  As the water-insoluble powder material (A), those usually used for tooth abrasives are preferable, and specifically, inorganic materials are preferable. Here, “water-insoluble” means that the amount dissolved in 100 g of water (20 ° C.) is 1 g or less. Specifically, for example, selected from light calcium carbonate, heavy calcium carbonate, zeolite, silica, dicalcium phosphate, tricalcium phosphate, insoluble sodium metaphosphate, aluminum hydroxide, magnesium phosphate, calcium pyrophosphate, magnesium carbonate, etc. 1 type, or 2 or more types. These may be used alone or in combination of two or more.

  Among these water-insoluble powder materials (A), the granule (I) is given a specific shape or a specific particle size distribution, which is described later, and it has a high dirt removal ability even under a low load as in the case of using a soft toothbrush. Light calcium carbonate, heavy from the viewpoint that it can sufficiently remove stains such as plaque and colored stains, and can improve the smooth feel and stain removal on the tooth surface. One or more selected from calcium carbonate, zeolite, and silica are preferable, one or two selected from light calcium carbonate and heavy calcium carbonate are more preferable, and heavy calcium carbonate is more preferable. Here, the smooth touch means that when the tooth surface is touched with the tongue, it is possible to smoothly slide the tongue on the surface of the tooth without obtaining a touch of plaque or dirt. Feeling is the feeling of dirt removal, which means that the tooth surface is smooth and feels free of dirt.

The average particle size of the water-insoluble powder material (A) is preferably 0.1 μm or more, more preferably 0.5 μm or more, and still more preferably 0.8 μm or more, from the viewpoint of removing plaque or dirt after granule disintegration. It is 8 μm or more, and more preferably 1 μm or more. Moreover, from a viewpoint of reducing a foreign material feeling, Preferably it is 20 micrometers or less, More preferably, it is 15 micrometers or less, More preferably, it is 10 micrometers or less, More preferably, it is 5 micrometers or less. The average particle size of the water-insoluble powder material (A) is preferably 0.1 to 20 μm, more preferably 0.5 to 15 μm, still more preferably 0.8 to 10 μm, and still more preferably. Is 1-5 μm.
The average particle size can be measured by the method described in the examples.

  The content of the water-insoluble powder material (A) is preferably 60% by mass or more in the dry state in the granule (I) from the viewpoint of realizing the gradually disintegrating behavior and enhancing the polishing power. Preferably it is 70 mass% or more, More preferably, it is 80 mass% or more, More preferably, it is 82 mass% or more. The content of the water-insoluble powder material (A) is preferably 98% by mass or less, more preferably 96% by mass or less in the dry state in the granule (I) from the viewpoint of suppressing damage to teeth. More preferably, it is 90 mass% or less. The content of the water-insoluble powder material (A) is preferably 60 to 98% by weight, more preferably 70 to 96% by weight in the granule (I), more preferably 70 to 96% by weight, and still more preferably 80 to It is 96 mass%, More preferably, it is 82-90 mass%.

  Since the inorganic binder (B) contained in the granule (I) binds to the water-insoluble powder material (A) while having a void in the granule (I), it can sufficiently remove plaque. It brings about the effect | action which improves the slippery feeling in the surface of a tooth | gear, and a feeling of dirt removal. Examples of the inorganic binder (B) include one or more selected from a water-soluble inorganic binder and a water-insoluble inorganic binder. Specific examples of the water-soluble inorganic binder include one or more selected from sodium silicate, polyacrylic acid, processed cellulose, polyvinyl pyrrolidone, silicone, and the like, and sodium silicate is preferable. Specific examples of the water-insoluble inorganic binder include one or more selected from colloidal silica, magnesium aluminate metasilicate, synthetic aluminum silicate, calcium silicate, alumina sol, and the like, and colloidal silica is preferable. Especially, it is preferable that a water-soluble inorganic binder is included from a viewpoint of exhibiting the effect of this invention satisfactorily, and it is more preferable that sodium silicate is included. By including one or two kinds selected from sodium silicate and colloidal silica as the inorganic binder (B), the foam quality, foaming and feel of the granules are further improved, and the smooth feel on the tooth surface and A feeling of dirt removal can be enhanced.

Such sodium silicates include sodium metasilicate (Na ₂ SiO ₃ ), sodium orthosilicate (Na ₄ SiO ₄ ), sodium disilicate (Na ₂ Si ₂ O ₅ ), sodium tetrasilicate (Na ₂ Si ₄ O ₉ ), and The 1 type (s) or 2 or more types chosen from those hydrates are mentioned.
Sodium silicate is generally represented by the molecular formula Na ₂ O.nSiO ₂ .mH ₂ O. The coefficient n (molecular ratio of SiO _{2 to} Na ₂ O) is called molar ratio and can be represented by the following formula (I).
Molar ratio = mass ratio (SiO ₂ mass% / Na ₂ O mass%) × (Molecular weight of Na ₂ O / Molecular weight of SiO ₂ ) (I)
As sodium silicate, water silicates of various molar ratios can be used in addition to sodium silicate Nos. 1, 2 and 3 described in JIS K1408. Among them, sodium silicate 3 is more preferable.

  Although the physical properties of sodium silicate vary depending on the molar ratio (coefficient n), the compatibility with quasi-drug raw material standards, the viewpoint of satisfactorily exerting the effects of the present invention, and the pH of granules (I) are made alkaline. From the viewpoint, the molar ratio (coefficient n) is preferably 2.0 or more, more preferably 2.4 or more, still more preferably 2.8 or more, and even more preferably 3.0 or more. Yes, preferably 4.0 or less, more preferably 3.5 or less, still more preferably 3.4 or less, and even more preferably 3.3 or less. And said molar ratio (coefficient n) becomes like this. Preferably it is 2.0-4.0, More preferably, it is 2.4-3.5, More preferably, it is 2.8-3.4, More preferably, it is 3.0-3.3.

  The content of one or two selected from sodium silicate (solid content) and colloidal silica in the inorganic binder (B) contained in the granule (I) is a viewpoint of granulating a water-insoluble powder material as an inorganic binder. From the above, in the component (B), it is preferably 60% by mass or more, more preferably 80% by mass or more, and still more preferably 90% by mass or more. From the viewpoint of suppressing and increasing the wet disintegration strength of the granule (I), it is preferably 100% by mass or less. In addition, the amount of sodium silicate (solid content) and colloidal silica in the inorganic binder (B) excludes moisture after the granules (I) extracted from the dentifrice composition were dried at 90 ° C. or higher. Amount.

  The content of the component (B), which is one or two kinds selected from sodium silicate (solid content) and colloidal silica in the granule (I), is the dry state of the granule and the appropriate disintegration strength in water, dentifrice composition From the viewpoint of stability in the medium and from the viewpoint of realizing a gradually disintegrating behavior, the granule (I) is preferably 1% by mass or more, more preferably 2% by mass or more in a dry state, Preferably it is 5 mass% or more, More preferably, it is 10 mass% or more. The content of sodium silicate in the granule (I) is preferably 30% by mass or less, more preferably 20% by mass or less, and still more preferably 18% in the granule (I) from the viewpoint of increasing the yield. It is below mass%. The content of sodium silicate in the granule (I) is preferably 1 to 30% by mass, more preferably 2 to 20% by mass, still more preferably 5 to 18% by mass, and still more preferably. 10 to 18% by mass.

  In the granule (I), the mass ratio of the inorganic binder (B) to the water-insoluble powder material (A) (inorganic binder (B) / water-insoluble powder material (A)) From the viewpoint of achieving a satisfactory disintegration strength and realizing a gradually disintegrating behavior, it is preferably 0.02 or more, more preferably 0.05 or more, and further preferably 0.08 or more. Further, from the viewpoint of reducing coarse particles to obtain an appropriate disintegration strength, the mass ratio is preferably 0.5 or less, more preferably 0.3 or less, and further preferably 0.18 or less. . And this mass ratio becomes like this. Preferably it is 0.02-0.5, More preferably, it is 0.05-0.3, More preferably, it is 0.08-0.18. In addition, content in case the said component (B) contains sodium silicate is a solid content conversion value.

  Granule (I) is further made of calcium silicate, oxidized from the viewpoint of imparting a plaque formation inhibitory effect, and from the viewpoint of improving the properties of gradually disintegrating by strengthening the network structure formed by water-soluble silicate or colloidal silica. It is preferable to contain one or two or more types of binding aids (C) selected from magnesium, titanium oxide and zinc oxide, more preferably at least zinc oxide as such component (C), More preferably, it contains other binding aids.

  The content of the component (C) is preferably 0.2% by mass or more in the dry state in the granule (I) from the viewpoint of improving the plaque formation inhibitory effect and gradually disintegrating physical properties, and more preferably It is 0.5 mass% or more, More preferably, it is 0.8 mass% or more. In addition, the content of the component (C) is the granule (I) from the viewpoint of suppressing the disintegration strength from becoming excessively high, improving the foaming and foam quality of the dentifrice composition, and suppressing the metallic taste. In the dry state, it is preferably 5% by mass or less, more preferably 3% by mass or less, and further preferably 2% by mass or less. Further, the content of the component (C) is preferably 0.2 to 5% by mass, more preferably 0.5 to 3% by mass, and further preferably 0 in the dry state in the granule (I). .8 to 2% by mass.

  The mass ratio (C / B) of the component (C) and the component (B) in the granule (I) is the viewpoint of realizing an appropriate disintegration strength, the viewpoint of improving the foaming and foam quality of the dentifrice composition, the tooth surface From the viewpoint of the cleaning performance of recesses of various sizes, preferably 0.02 or more, more preferably 0.05 or more, still more preferably 0.08 or more, preferably 1 or less, More preferably, it is 0.5 or less, More preferably, it is 0.3 or less, More preferably, it is 0.2 or less. Moreover, the mass ratio (C / B) of the component (C) and the component (B) in the granule (I) is preferably 0.02-1, more preferably 0.05-0.5, More preferably, it is 0.08-0.3, More preferably, it is 0.08-0.2.

The granule (I) can contain organic fibers, medicinal components, colorants and the like in addition to the above components, as necessary, within a range not impairing the effects of the present invention.
Other components other than the above components may be used alone or in combination of two or more.

The granule (I) has a unique shape, and the area (S _A ) of the projection surface of the granule and the area of the circumscribed circle (S _S ) whose maximum diameter (D _L ) on the projection surface is the diameter. The average value of the ratio (S _A / S _S ) is 0.5 or more and 0.9 or less. The area of the projection surface of the granule (I) in the present invention is such that an aqueous solution of a dentifrice composition diluted to 10% by mass with purified water is washed with purified water using a JISZ8801-1 standard 150 μm sieve, and is then placed on the sieve. The value measured using the granule which dried the remaining granule for 1 day at room temperature (25 degreeC) is meant. The projection surface of the granule (I) means a surface photographed using KEENCE VH-5500 (magnification 100 times), and the photographed digital image is analyzed using the analysis software (WinROOF (Mitani Corporation)). The ratio (S _A / S _S ) between the area (S _A ) on one projection plane and the area (S _S ) of the circumscribed circle whose diameter is the maximum passing diameter (D _L ) on the projection plane is obtained. The average value of S _A / S _S is obtained based on the projection plane from the direction or the projection plane using other granules (I), and the maximum passing diameter (D _L ) is determined as the diameter on the projection plane. The average value of S _A / S _S obtained from the area of the circumscribed circle (S _S ) and the area of the projection plane (S _A ) becomes a value closer to 1 as the granules are spherical. ) Is such that the average value of S _A / S _S is maximum on the projection plane in this way. Since the area (S _S ) of the circumscribed circle whose diameter is the passing diameter (D _L ) is 0.5 or more and 0.9 or less, it is not a spherical granule but an irregular shape having a plurality of irregularities on the surface. The granules (I) have a unique shape, so-called irregular shape, and the granule (I) has a moderate irregular shape in which convex portions are formed when the granule before blending is crushed or partially chipped. While it does not feel a foreign body feeling, it gradually collapses due to an irregular shape, and at the end of toothbrushing, it can give a feeling that many granules have collapsed and the toothbrushing action has ended.

  Since the granule (I) has such a unique shape, when a load is applied in the oral cavity with a toothbrush or the like, the load is concentrated on the convex portion, so that the granule (I) is easily collapsed. It is thought that it will gradually collapse. This is because each granule (I) is formed by agglomerating primary particles to form intermediate particles, which are further agglomerated, so that the voids are appropriately scattered in the granules, This is probably because the intermediate particles protruding from the surface collapse as the load is applied. And until a granule finally disintegrates, it will change to an intermediate particle first, and this intermediate particle will disintegrate gradually, crushing further finely. In addition, the granule (I) is preferably a granule obtained by mixing the granule before blending with the dentifrice composition and then stirring during the production of the dentifrice composition. Thus, in the use scene using the dentifrice composition of the present invention containing the granule (I) obtained after stirring at the time of manufacture, the granule (I) does not collapse at a stroke due to the load of the toothbrush, and the brushing During this time, the granules gradually disintegrate, and while these collide with the tooth surface, they penetrate into minute recesses such as the frequency band of the tooth, effectively transmitting the load from the toothbrush, The ability to remove dirt can be sufficiently exerted, and the smooth feel and the feeling of dirt removal on the tooth surface can be improved.

The average (S _A / S _S ) ratio of the area (S _A ) of the projection surface of the granule (I) and the area (S _S ) of the circumscribed circle whose diameter is the maximum passing diameter (D _L ) on the projection surface The value is 0.5 or more, preferably 0.6 or more, more preferably 0.65 or more, and even more preferably 0.7 or more, from the viewpoint of securing the gradually collapsing behavior. is there. The average (S _A / S _S ) ratio of the area (S _A ) of the projection surface of the granule (I) and the area (S _S ) of the circumscribed circle whose diameter is the maximum passing diameter (D _L ) on the projection surface The value is 0.9 or less, preferably 0.85 or less, and more preferably 0.85 or less from the viewpoint of effectively transmitting a load even with a toothbrush having a soft bristle that exhibits moderate disintegration. Is 0.82 or less. The average (S _A / S _S ) ratio of the area (S _A ) of the projection surface of the granule (I) and the area (S _S ) of the circumscribed circle whose diameter is the maximum passing diameter (D _L ) on the projection surface The value is 0.5 or more and 0.9 or less, preferably 0.6 to 0.9, more preferably 0.65 to 0.85, and still more preferably 0.75 to 0.00. 82. In addition, as a soft bristle, the taper bristle which the cross-sectional area of the hair tip of a bristle becomes small gradually is mentioned, for example. Such a taper bristle has a soft touch due to its thin tip, and has a property that a hair tip easily enters a gap between teeth.

The average value of the ratio (D _L / D _S ) between the maximum delivery diameter (D _L ) and the minimum delivery diameter (D _S ) on the projection surface of the granule (I) gradually becomes an irregular granule and gradually collapses. From the viewpoint of exhibiting behavior and even a toothbrush having a soft bristle, from the viewpoint of effectively transmitting a load, it is preferably 1.2 or more, more preferably 1.3 or more, and even more preferably 1.4. That's it. The average value of the ratio (D _L / D _S ) between the maximum delivery diameter (D _L ) and the minimum delivery diameter (D _S ) on the projection surface of the granule (I) expresses moderate disintegration, From the viewpoint of effectively transmitting the load, it is preferably 1.8 or less, more preferably 1.7 or less, and even more preferably 1.65 or less. The average value of the ratio (D _L / D _S ) between the maximum diameter (D _L ) and the minimum diameter (D _S ) on the projection surface of the granule (I) is preferably 1.2 to 1.8. More preferably, it is 1.3-1.7, More preferably, it is 1.4-1.65.

Granule (I) also has a unique particle size distribution, in which the following granules (a) to (d) in the particle size distribution by laser diffraction / scattering particle size distribution measurement:
(A) Granules having a particle size of 50 μm or more and less than 100 μm (b) Granules having a particle size of 100 μm or more and less than 150 μm (c) Granules having a particle size of 150 μm or more and less than 200 μm (d) Among granules having a particle size of 200 μm or more and less than 250 μm The volume ratio (b / c) of the amount of granules (b) to the amount of granules (c) is 0.7 or more and 1.2 or less, and the volume ratio (d / c) of granules (d) to granules (c) ) Is 0.2 or more and 1 or less, the volume ratio (b / d) of the amount of the granule (b) to the amount of the granule (d) is greater than 1 and 5 or less, and the granule (I) of the granule (c) ) Is 15 volume% or more and 55 volume% or less.
That is, when the volume ratio (b / c) of these amounts between the granule (a) and the granule (b) is in the above range, the granule (b) is comparable to the granule (c). Since the volume ratio (d / c) is in the above range and the granule (b / d) is greater than 1 and less than or equal to 5, the granule (b) It is present in an amount greater than granules (d). Accordingly, since there are a large amount of granules (b) and (c) having a particle size of 100 μm or more and less than 200 μm, and an appropriate amount of granules (d) having a particle size of 200 μm or more, a toothbrush having a diameter of about 200 μm Granules (b) and granules (c) that easily penetrate into minute recesses such as the frequency of the tooth surface that are difficult to penetrate in the toothbrush bristle, while granules (d) that easily transmit stress from the bristle are present. There will be many. As a result, as the toothbrush load is applied by brushing, the granules from the toothbrush are effectively transmitted while these granules are gradually entangled and disintegrate and penetrate into minute recesses such as the frequency of the teeth. Thus, it is considered that the plaque or dirt removing performance can be sufficiently exerted, and the feeling that the tooth surface is smooth and smooth and the feeling that the dirt is removed can be improved.

The granules (I) contained in the dentifrice composition of the present invention mean those having a particle size of 50 μm or more determined by laser diffraction / scattering particle size distribution measurement. Further, the granule (I) is an irregular granule as described above, and the particle size obtained by laser diffraction / scattering particle size distribution measurement is the above-mentioned maximum delivery diameter (D _L ) and minimum delivery diameter (D _S It is considered that the value is almost approximate to the average value.

  In the granule (I), the volume ratio (b / c) of the amount of the granule (b) to the amount of the granule (c) in the particle size distribution measured by laser diffraction / scattering type particle size distribution shows a behavior of gradually disintegrating. However, it effectively penetrates into the fine recesses, more preferably effectively penetrates into the recesses having a width of 150 μm or less, and from the viewpoint of enhancing the feeling that the tooth surface after brushing is smooth, it is 0.7 or more. Thus, it is preferably 0.75 or more, more preferably 0.8 or more. In the granule (I), the volume ratio (b / c) of the amount of the granule (b) to the amount of the granule (c) in the particle size distribution measured by laser diffraction / scattering particle size distribution (b / c) From the viewpoint of causing granules that gradually disintegrate while being entangled with c) to exist in various shapes, it is 1.2 or less, preferably 1.1 or less, more preferably 1.0 or less, More preferably, it is 0.95 or less. In the granule (I), the volume ratio (b / c) of the amount of the granule (b) to the amount of the granule (c) in the particle size distribution measured by laser diffraction / scattering particle size distribution is 0.7 or more and 1 .2 or less, preferably 0.75 or more and 1.1 or less, more preferably 0.8 or more and 1.0 or less, and still more preferably 0.8 or more and 0.95 or less.

  In the granule (I), the volume ratio (d / c) of the amount of the granule (d) to the amount of the granule (c) in the particle size distribution measured by laser diffraction / scattering particle size distribution (d / c) determines the stress load of the bristle of the toothbrush. From the viewpoint that the easily transmitted granules (d) are entangled with the granules (b) and granules (c) and gradually disintegrate to have granules with various shapes, it is 0.2 or more, preferably 0 .25 or more, more preferably 0.3 or more. In the granule (I), the volume ratio (d / c) of the amount of the granule (d) and the amount of the granule (c) in the particle size distribution measured by laser diffraction / scattering particle size distribution is determined by the granule (d) ( From the viewpoint that b) and the granule (c) effectively penetrate into a fine recess, it is 1 or less, preferably 0.9 or less, more preferably 0.85 or less, and still more preferably 0.8. 8 or less. In the granule (I), the volume ratio (d / c) of the amount of the granule (d) to the amount of the granule (c) in the particle size distribution by laser diffraction / scattering particle size distribution measurement is 0.2 or more and 1 It is below, Preferably it is 0.25 or more and 0.9 or less, More preferably, it is 0.25 or more and 0.85 or less, More preferably, it is 0.3 or more and 0.8 or less.

  In the granule (I), the volume ratio (b / d) of the amount of the granule (b) and the amount of the granule (d) in the particle size distribution measured by laser diffraction / scattering particle size distribution is the particle size distribution of the granule (I). In the center of the content of the granules (c), including more granules (b) than the granules (d) that are easy to enter the fine recesses where the bristle of the toothbrush on the tooth surface is difficult to reach, From the viewpoint of improving the dirt removal performance and from the viewpoint of improving foaming and foam quality of the dentifrice composition containing the granule (I), it is greater than 1, preferably 1.1 or more, more preferably 1.2 or more. It is. In the granule (I), the volume ratio (b / d) of the amount of the granule (b) to the amount of the granule (d) in the particle size distribution measured by laser diffraction / scattering type particle size distribution is as follows. Under the load of bristle, it is 5 or less, preferably 4 or less, from the viewpoint of causing the granules (c) and the granules (b) to gradually disintegrate while being entangled with each other and to have granules with various shapes. More preferably, it is 2.8 or less. Further, in the granule (I), the volume ratio (b / d) of the amount of the granule (b) to the amount of the granule (d) in the particle size distribution measured by laser diffraction / scattering particle size distribution (b / d) is larger than 1 and 5 or less. It is preferably 1.1 to 4, more preferably 1.2 to 2.8.

  In addition, the particle size distribution of the granule (I) and the pre-combination granule to be blended to obtain the granule (I) described later is based on the laser diffraction / scattering particle size distribution measurement and is contained in the dentifrice composition. In the case of granule (I), a dentifrice is measured using an aqueous solution diluted to 10% by mass with ion-exchanged water. In the case of granule before blending, an aqueous solution diluted to 5% by mass with ion-exchanged water is used. Use to measure. More specifically, an aqueous solution obtained by diluting the dentifrice composition containing granules (I) to 10% by mass with ion-exchanged water (or an aqueous solution obtained by diluting granules before blending to 5% by mass with ion-exchanged water) is mixed with a mixer. (ROTARY MIXER NPC-20, manufactured by NISSIN), the granules are dispersed under conditions of 75 rotations / minute, horizontal rotation, 2 hours. Next, an aqueous solution obtained by diluting the dentifrice composition after dispersion containing the granules (I) (or an aqueous solution in which the granules before blending are dispersed) is stored at room temperature (25 ° C.) for 1 day. The aqueous solution after storage was again dispersed for 10 minutes by the mixer, and then the aqueous solution was used to measure a refractive index of 1 with a laser diffraction / scattering particle size distribution analyzer (Partica LA-950V2, manufactured by HORIBA). .58, measured under conditions of circulation speed (scale: 5), stirring speed (scale: 5).

  In the granule (I), the amount of the granule (c) in the particle size distribution measured by laser diffraction / scattering particle size distribution is 15% by volume or more and 55% by volume or less in the granule (I). The amount of the granule (c) is the fineness of the width of the tooth surface less than 200 μm while being intertwined with other granules during brushing with a toothbrush in terms of the dirt removal performance of the recess having a width of 150 μm or less on the tooth surface. From the viewpoint of the removal performance of the concave portion, it is 15% by volume or more in the granule (I), preferably 20% by volume or more, more preferably 23% by volume or more, and 55% by volume or less, Preferably it is 50 volume% or less, More preferably, it is 45 volume% or less, More preferably, it is 40 volume% or less. The amount of the granule (c) is 15% by volume to 55% by volume in the granule (I), preferably 20 to 50% by volume, more preferably 23 to 45% by volume, Preferably it is 23-40 volume%.

  In the granule (I), the granule (c) is present in the largest amount among the granules (a) to (d), or the granule (c) and the granule (b) are present in almost the same amount. Therefore, the dentifrice composition contains a large amount of granules that enter the recesses having a width of less than 200 μm that are difficult for the toothbrush bristle to reach. The total amount of the granule (b) and the granule (c) is preferably 30% by volume or more in the granule (I), from the viewpoint of high dirt removal performance in a fine recess that is difficult for the toothbrush bristle to reach. Is 35% by volume or more, more preferably 40% by volume or more, and still more preferably 50% by volume or more. The total amount of granule (b) and granule (c) is sufficient to transmit the stress due to the bristle of the toothbrush to the granules (a) to (c), and even when a toothbrush having a soft bristle is used, the width is 200 μm. From the viewpoint of effectively exhibiting high dirt removal performance, not only in the recesses having a size of less than 100 μm, but also in the granules (I), preferably 85% by volume or less. More preferably, it is 80 volume% or less, More preferably, it is 75 volume% or less. The total amount of the granules (b) and the granules (c) is preferably 30 to 85% by volume, more preferably 35 to 80% by volume, and still more preferably 40 to 80 in the granules (I). % By volume, and more preferably 50 to 75% by volume.

  In the granule (I), the volume of the total amount of the granule (a) and the granule (b) and the total amount of the granule (c) and the granule (d) in the particle size distribution measured by laser diffraction / scattering particle size distribution The ratio ((a + b) / (c + d)) is such that, even in a toothbrush having a soft bristle, the brushing stress due to the toothbrush is transmitted to a small granule of 200 μm or less, and the concave portion on the surface of the tooth having a width of 200 μm or less. From the viewpoint of effectively allowing the granules (I) to penetrate and from the viewpoint of improving foaming and foam quality of the dentifrice composition, it is preferably 0.5 or more, more preferably 0.6 or more, and even more preferably 0. .65 or more, preferably 1 or less, more preferably 0.9 or less, and further preferably 0.85 or less. The volume ratio ((a + b) / (c + d)) of the total amount of the granules (a) and granules (b) and the total amount of the granules (c) and granules (d) is preferably 0.5 to 1. More preferably, it is 0.6-0.9, More preferably, it is 0.65-0.85.

  The granule (I) may further contain a granule (e) having a particle size distribution of 250 μm or more and less than 350 μm as measured by laser diffraction / scattering particle size distribution measurement. The volume ratio ((a + b) / e) of the total amount of the granules (a) and granules (b) and the amount of the granules (e) in the granules (I) is the cleaning by the granules (a) to (d). From the viewpoint of improving performance, it is preferably larger than 1, more preferably 1.1 or more, further preferably 1.2 or more, still more preferably 1.3 or more, preferably 20 or less. Yes, more preferably 18 or less. The volume ratio ((a + b) / e) of the total amount of the granules (a) and granules (b) and the amount of the granules (e) is preferably more than 1 and 20 or less, more preferably 1.1. It is -20, More preferably, it is 1.2-18, More preferably, it is 1.3-18.

  In the granule (I), the amount of the granule (a) in the particle size distribution measured by the laser diffraction / scattering particle size distribution measurement gradually disintegrates by being interposed between the granules having a larger particle size than the granule (a). From the viewpoint of ensuring a sufficient amount of granules (I) to penetrate into the fine recesses on the tooth surface and improving the plaque removal performance, the granules (I) are preferably 3% by volume or more, and more Preferably, the content is 5% by volume or more, and from the viewpoint of improving foam quality and foaming, more preferably 7% by volume or more, and entangled with the granule (b) or the granule (c). From the viewpoint of accelerating, it is preferably 15% by volume or less, more preferably 12% by volume or less, and still more preferably 10% by volume or less. In addition, the amount of the granule (a) in the particle size distribution measured by laser diffraction / scattering particle size distribution measurement in the granule (I) is preferably 3 to 15% by volume in the granule (I), more preferably It is 5-12 volume%, More preferably, it is 7-10 volume%.

  In the granule (I), the amount of the granule (b) in the particle size distribution measured by the laser diffraction / scattering type particle size distribution is intertwined with the granule (a), but between the granules having a larger particle size than the granule (b). From the viewpoint of ensuring the behavior of being gradually disintegrated by intervening in the granule (I), it is preferably at least 12% by volume, more preferably at least 15% by volume, even more preferably at least 20% by volume. Yes, preferably 50% by volume or less, more preferably 40% by volume or less, and still more preferably 35% by volume or less.

  In the granule (I), the amount of the granule (d) in the particle size distribution measured by the laser diffraction / scattering particle size distribution measurement is such that the stress of the bristle of the toothbrush is transmitted to the granule (a) to the granule (c). From the viewpoint of ensuring a behavior of gradually disintegrating by entanglement with the granules, it is preferably 5% by volume or more, more preferably 10% by volume or more, and further preferably 12% by volume in the granule (I). It is above, Preferably it is 25 volume% or less, More preferably, it is 22 volume% or less, More preferably, it is 20 volume% or less.

  In addition, in the granule (I), the amount of the granule (e) in the particle size distribution measured by laser diffraction / scattering particle size distribution is determined from the viewpoint of improving the cleaning performance of the granules (a) to (d). ), Preferably more than 0% by volume, more preferably 1% by volume or more, still more preferably 2% by volume or more, preferably 25% by volume or less, more preferably 20% by volume or less. More preferably, it is 18 volume% or less.

  In the granule (I), the amount of granules having a particle size of 350 μm or more in the particle size distribution measured by laser diffraction / scattering particle size distribution is preferably 0% by volume or 0 in the granule (I). More than 35% by volume, more preferably 15% by volume or less, still more preferably 10% by volume or less, and still more preferably 5% by volume or less. In the granules (I) contained in the dentifrice composition of the present invention, the amount of granules having a particle size of 350 μm or more is preferably 10% by volume or more, more preferably 15% by volume in the granules (I). It is above, More preferably, it is 20 volume% or more, Preferably it is 35 volume% or less. It is preferable that the granule (I) has a particle size distribution changed in the mixing step after blending the granule with the dentifrice composition, because part of the granule is broken or the granule is crushed. When such a granule (I) to be contained in the composition is used, it is disintegrated by brushing with a toothbrush while providing a feel that allows the granules to be satisfactorily touched in the oral cavity when a dentifrice composition is used. However, it is thought that it becomes easy to penetrate into the minute recesses on the tooth surface.

The average particle diameter r (μm) of the granule (I) is preferably 75 μm or more, more preferably 100 μm or more, and even more preferably 125 μm or more from the viewpoint of having sufficient polishing power, From the viewpoint of suppressing the feeling of foreign matter, it is preferably 250 μm or less, more preferably 220 μm or less, still more preferably 210 μm or less, and even more preferably 180 μm or less. And the average particle diameter r (micrometer) of granule (I) becomes like this. Preferably it is 75-250 micrometers, More preferably, it is 100-220 micrometers, More preferably, it is 125-210 micrometers, More preferably, it is 125-180 micrometers is there.
The average particle diameter r of the granule (I) is a volume average particle diameter, and is a median diameter in a particle size distribution in a granule having a particle diameter of 50 μm or more by laser diffraction / scattering particle size distribution measurement.

The disintegration strength of the granule (I) having a specific shape or a specific particle size distribution contained in the dentifrice composition of the present invention is 1 gf / piece or more and 20 gf / piece or less. By having such disintegration strength, it is possible to gradually disintegrate by an irregular shape when a load is applied with a toothbrush or the like, while not causing a sense of foreign matter in the mouth, and even to a fine recess. Granules can enter to sufficiently remove dirt such as plaque and colored stains. The disintegration strength of the granule (I) is a toothbrush having a soft bristle due to the interaction with the specific shape or specific particle size distribution of the granule (I) from the viewpoint of enhancing the dirt removal performance while showing the gradually disintegrating behavior. However, from the viewpoint that the granule (I) gradually collapses due to the stress of the toothbrush and penetrates into the fine concave portion, it is 1 gf / piece or more, preferably 2 gf / piece or more, more preferably 3 gf / piece. That's it. The disintegration strength of the granule (I) is 20 gf / piece or less from the viewpoint of imparting moderate disintegration even with a low load when using a soft toothbrush or the like, and from the viewpoint of reducing the feeling of foreign matter. From the viewpoint of improving foaming and foam quality of the dentifrice composition, it is preferably 10 gf / piece or less, and more preferably 8 gf / piece or less. Further, the disintegration strength of the granule (I) is 1 gf / piece or more and 20 gf / piece or less, preferably 2 to 15 gf / piece, more preferably 3 to 10 gf / piece, further preferably 3 to 3 gf / piece. 8 gf / piece.
The disintegration strength of the granules (I) is a value when measured in a wet state, and 10 to 20 granules (I) are taken out from the dentifrice composition, and a compression tester (Shimadzu Corporation, MCTM) -500), the load when a granule having a particle size (180 to 200 μm) was compressed and collapsed at a load rate of 1.51 gf / sec was measured for each granule, and the average value obtained. In the granule (I) used in the present invention, the disintegration strength in the wet state and the disintegration strength in the dry state are the same value.

  In the granule (I), the inorganic binder of component (B) is converted into an aqueous solution (hereinafter referred to as “inorganic binder aqueous solution”) as necessary, and mixed with the water-insoluble powder material of component (A), preferably Granules formed by adding an inorganic binder aqueous solution to (A) may be used as pre-combination granules, which may be blended into the dentifrice composition. When mixing these, you may add the coupling | bonding adjuvant of a component (C) further.

  When sodium silicate is included as the component (B), a sodium silicate aqueous solution can be used as the sodium silicate, and the content of sodium silicate (solid content) in the sodium silicate aqueous solution is the disintegration characteristics of the granules and the productivity of the granules. From the viewpoint of the above, in the sodium silicate aqueous solution, it is preferably 20% by mass or more, more preferably 30% by mass or more, more preferably 35% by mass or more, and from the viewpoint of suppressing coarse particles, preferably 65%. It is not more than mass%, more preferably 60 mass%. In addition, the sodium silicate (solid content) in sodium silicate aqueous solution can be calculated | required by the method of an Example description. Further, when sodium silicate is included as the component (B), the mass ratio of the component (A) to the inorganic binder aqueous solution (A / inorganic binder aqueous solution) is approximately 10 to 1, preferably 8 to 5. Since it can granulate satisfactorily, the inorganic binder aqueous solution is preferably prepared by diluting the inorganic binder containing sodium silicate of component (B) with 3 times or less of water. Further, it may be mixed with the water-insoluble powder material of component (A) without being diluted with water, and preferably an aqueous inorganic binder solution may be added to component (A) to form granules before blending. Such an aqueous inorganic binder solution is desirably added to the water-insoluble powder material of component (A) at a moderate rate from the viewpoint of agglomerating and forming granules while effectively forming voids.

  Specifically, for example, the addition rate of the inorganic binder aqueous solution is preferably 35 parts by mass or less, more preferably 20 parts by mass / min with respect to 100 parts by mass of the water-insoluble powder material (A). Or less, more preferably 10 parts by mass or less, preferably 0.5 parts by mass or more, more preferably 0.8 parts by mass or more, and further preferably 1 part by mass. / Min or more. The above range is suitable when using sodium silicate No. 1, 2 or 3 described in JIS K1408. And the addition rate of the said inorganic binder aqueous solution becomes like this. Preferably it is 0.5-35 mass parts / min with respect to 100 mass parts of water-insoluble powder material (A), More preferably, it is 0.8-20 masses. %, More preferably 1 to 10% by mass.

  Moreover, from the same viewpoint as described above, the addition rate of sodium silicate (solid content) is preferably 19 parts by mass or less, and more preferably with respect to 100 parts by mass of the water-insoluble powder material (A). 11 parts by mass / min or less, more preferably 5.5 parts by mass / min or less, preferably 0.1 parts by mass / min or more, more preferably 0.2 parts by mass / min or more, More preferably, it is 0.3 mass part / min or more. And the addition rate of the said sodium silicate (solid content) becomes like this. Preferably it is 0.1-19 mass parts / min with respect to 100 mass parts of water-insoluble powder materials, More preferably, it is 0.2-11 mass%. More preferably, it is 0.3-5.5 mass%.

  As described above, an aqueous solution of component (B) (inorganic binder aqueous solution) and, if necessary, component (C) are added to component (A) to form granules before blending to obtain granules (I). For this, it is preferable to produce by a rolling granulation method. By blending the pre-combination granule produced by the tumbling granulation method with the dentifrice composition, it is not a spherical granule obtained by the conventionally used spray granulation method but has a unique shape used in the present invention. It becomes possible to obtain granules (I), and it is possible to obtain granules (I) having a specific particle size distribution used in the present invention by obtaining pre-combination granules having a broad particle size distribution over a wide range. Moreover, it becomes possible to disperse more voids in the granule, and it is possible to obtain a granule (I) having the above-mentioned characteristics and exhibiting a gradually disintegrating behavior.

  Moreover, it is preferable to use a container rotation type granulator in order to manufacture the granule before mix | blending for obtaining granule (I) by the above rolling granulation methods. Examples of the container rotating granulator include a drum granulator and a bread granulator. The drum granulator is not particularly limited as long as the drum-shaped cylinder rotates and performs processing. Besides a drum granulator that is horizontally or slightly inclined, a conical drum granulator, a multi-stage conical drum granulator, or the like can be used. These apparatuses may be either batch type or continuous type.

  Furthermore, as described above, it is preferable to use a multi-fluid nozzle in order to add the inorganic binder aqueous solution to the water-insoluble powder material of the component (A) at a moderate rate. A multi-fluid nozzle is a nozzle that mixes and atomizes a liquid and atomizing gas (air, nitrogen, etc.) through an independent channel to the vicinity of the nozzle tip. A nozzle, a three-fluid nozzle, a four-fluid nozzle, etc. can be mentioned.

  The temperature of the aqueous inorganic binder solution when supplying the aqueous inorganic binder solution using a multi-fluid nozzle is preferably 5 ° C. or higher, more preferably 10 ° C. or higher, from the viewpoint of stability during addition. Is 50 ° C. or lower, more preferably 30 ° C. or lower. And the temperature of inorganic binder aqueous solution at the time of supplying inorganic binder aqueous solution using a multifluid nozzle has preferable 5-50 degreeC, and 10-30 degreeC is more preferable.

  In addition, when using the coupling aid of a component (C), it is preferable to mix | blend this component (C) with a component (A). Specifically, in the case of blending component (C), the production process for obtaining pre-blend granules is preferably container-rotating granulation of component (A) water-insoluble powder material and component (C) binding aid. And mixing into a component (A) and a component (C) (preferably a mixture of the component (A) and the component (C)) using a multi-fluid nozzle. It is more preferable to provide a step of supplying an inorganic binder aqueous solution.

  It is preferable to further dry the pre-mixing granules for obtaining the obtained granules (I) from the viewpoint of ensuring the stability of the granules (I). Specific examples of such drying include shelf drying, fluidized bed drying, reduced pressure drying, and microwave drying. Of these, shelf drying and fluidized bed drying are preferable from the viewpoint of equipment.

The drying temperature is preferably 60 ° C. or higher, more preferably 70 ° C. or higher, and further preferably 80 ° C. or higher from the viewpoint of heat load. Further, it is preferably 200 ° C. or lower, more preferably 150 ° C. or lower, further preferably 110 ° C., and still more preferably 90 ° C. or lower. And drying temperature becomes like this. Preferably it is 60-200 degreeC, More preferably, it is 70-150 degreeC, More preferably, it is 80-110 degreeC, More preferably, it is 80-90 degreeC.
The drying time is preferably 10 minutes or more, more preferably 20 minutes or more, still more preferably 30 minutes or more, preferably 24 hours or less, more preferably 20 hours or less, still more preferably 5 hours or less. And drying time becomes like this. Preferably it is 10 minutes-24 hours, More preferably, they are 20 minutes-20 hours, More preferably, they are 30 minutes-5 hours.

In the pre-combination granules for obtaining the granules (I) present in the dentifrice composition of the present invention, the following granules (b ′) to (e-1 ′) in the particle size distribution by laser diffraction / scattering particle size distribution measurement ):
(B ′) Granules with a particle size of 100 μm or more and less than 150 μm (c ′) Granules with a particle size of 150 μm or more and less than 200 μm (d ′) Granules with a particle size of 200 μm or more and less than 250 μm (e-1 ′) Particle size of 250 μm or more Among the granules of less than 300 μm, the volume ratio (b ′ / c ′) of the amount of granules (b ′) to the amount of granules (c ′) is preferably 0.6 or more and 1.25 or less, and the granules (d The volume ratio (d '/ c') between the amount of ') and the amount of granules (c') is preferably 0.7 or more and 1.2 or less, and the amount of granules (e-1 ') and the amount of granules (c The volume ratio (e-1 ′ / c ′) of the quantity “) is preferably 0.4 or more and 1.1 or less. That is, in the granule before blending, the granule having a particle size in the range of 100 μm or more and less than 300 μm has a broad peak that is present in almost the same amount, and by blending this, the unique shape as described above is obtained. Alternatively, granules (I) having a specific particle size distribution can be included in the dentifrice composition.

The pre-combination granule is a granule before blending in the dentifrice composition for obtaining the granule (I) contained in the dentifrice composition of the present invention, and is measured by laser diffraction / scattering particle size distribution. Means a particle diameter of 50 μm or more. In addition, the particle size obtained by laser diffraction / scattering particle size distribution measurement is considered to be a value approximately approximate to the average value of the maximum delivery diameter (D _L ′) and the minimum delivery diameter (D _S ′).

  In the granule before blending, the volume ratio (b ′ / c ′) of the amount of the granule (b ′) and the amount of the granule (c ′) in the particle size distribution by laser diffraction / scattering particle size distribution measurement is as follows: From the viewpoint of setting the volume ratio (b / c) of the amount of the granule (b) and the amount of the granule (c) to a desired value, it is preferably 0.6 or more, more preferably 0.75 or more. More preferably, it is 0.8 or more. In the granule before blending, the volume ratio (b ′ / c ′) of the amount of the granule (b ′) and the amount of the granule (c ′) in the particle size distribution by laser diffraction / scattering particle size distribution measurement is as follows: From the standpoint of effectively imparting a behavior that gradually collapses, the thickness is preferably 1.25 or less, more preferably 1.15 or less, and even more preferably 1.05 or less. In addition, in the granule before blending, the volume ratio (b ′ / c ′) of the amount of the granule (b ′) and the amount of the granule (c ′) in the particle size distribution by laser diffraction / scattering particle size distribution measurement is preferably It is 0.6 or more and 1.25 or less, More preferably, it is 0.75-1.15, More preferably, it is 0.8-1.05.

  In the granule before blending, the volume ratio (d ′ / c ′) of the amount of granule (d ′) to the amount of granule (c ′) in the particle size distribution measured by laser diffraction / scattering particle size distribution (d ′ / c ′) From the viewpoint of setting the volume ratio (d / c) of the amount of granules (d) to the amount of granules (c) in the desired value, it is preferably 0.7 or more, more preferably 0.8 or more. More preferably, it is 0.85 or more. In the granule before blending, the volume ratio (d ′ / c ′) of the amount of granule (d ′) to the amount of granule (c ′) in the particle size distribution measured by laser diffraction / scattering particle size distribution (d ′ / c ′) From the viewpoint of effectively imparting a gradually declining behavior, it is preferably 1.2 or less, more preferably 1.15 or less, and even more preferably 1.05 or less. Further, in the granule before blending, the volume ratio (d ′ / c ′) of the amount of the granule (d ′) and the amount of the granule (c ′) in the particle size distribution by laser diffraction / scattering particle size distribution measurement is preferably It is 0.7 or more and 1.2 or less, More preferably, it is 0.8-1.15, More preferably, it is 0.85-1.05.

  In the granule before blending, the volume ratio (e-1 ′ / c ′) of the amount of the granule (e-1 ′) and the amount of the granule (c ′) in the particle size distribution by laser diffraction / scattering particle size distribution measurement is From the viewpoint of easily obtaining granules (I) having a gradually disintegrating behavior, it is preferably 0.4 or more, more preferably 0.5 or more, further preferably 0.6 or more, more More preferably, it is 0.7 or more. In the granule before blending, the volume ratio (e-1 ′ / c ′) of the amount of the granule (e-1 ′) and the amount of the granule (c ′) in the particle size distribution by laser diffraction / scattering particle size distribution measurement is From the viewpoint of effectively imparting the gradually disintegrating behavior to the granule (I), it is preferably 1.1 or less, more preferably 1 or less. In addition, in the granule before blending, the volume ratio (e-1 ′ / c ′) of the amount of the granule (e-1 ′) and the amount of the granule (c ′) in the particle size distribution by laser diffraction / scattering particle size distribution measurement. Is preferably 0.4 or more and 1.1 or less, more preferably 0.5 to 1.1, still more preferably 0.6 to 1, and still more preferably 0.7 to 1. .

  In addition, in the granule before blending, (a ′) the amount of granule (granule (a ′)) having a particle size of 50 μm or more and less than 100 μm and granule (c ′) in the particle size distribution measured by laser diffraction / scattering particle size distribution measurement The volume ratio (a ′ / c ′) is preferably 0.2 or more, more preferably 0.3 or more, from the viewpoint of easily obtaining granules (I) having a gradually disintegrating behavior. . In the pre-combination granule, the amount of (a ′) granules (granule (a ′)) and the amount of granules (c ′) having a particle size of 50 μm or more and less than 100 μm in the particle size distribution measured by laser diffraction / scattering particle size distribution The volume ratio of (a ′ / c ′) is preferably 1.2 or less from the viewpoint of obtaining a granule (I) that has a gradually disintegrating behavior and can effectively penetrate into fine concave portions. Preferably it is 1 or less. In addition, in the granule before blending, the amount (a ′) of the granule (granule (a ′)) having a particle size of 50 μm or more and less than 150 μm and the granule (b ′) as measured by laser diffraction / scattering particle size distribution measurement The volume ratio (a ′ / b ′) of the amount is preferably 0.2 to 1.2, more preferably 0.3 to 1.

  In the granule before blending, the amount of the granule (a ′) in the particle size distribution measured by laser diffraction / scattering type particle size distribution is entangled well with the granule (a) and the granule (b) in the granule (I). From the viewpoint of ensuring the behavior of disintegration, it is preferably 3 to 20% by volume, more preferably 5 to 18% by volume, and even more preferably 7 to 15% by volume in the pre-blend granule.

  In the granule before blending, the amount of the granule (c ′) in the particle size distribution measured by laser diffraction / scattering particle size distribution is determined from the viewpoint that the granule (I) is present in a desired amount in the granule (I), and the granule (a ) And granules (b) are entangled well, and from the viewpoint of ensuring a gradually disintegrating behavior, it is preferably 5 to 30% by volume, more preferably 8 to 25% by volume in the granules before blending, More preferably, it is 10-20 volume%.

  Further, in the granule before blending, the amount of granules (granule (e-2 ')) (granule (e-2')) having a particle size distribution of 300 µm or more and less than 550 µm in the particle size distribution measured by laser diffraction / scattering particle size distribution measurement The volume ratio (e-2 ′ / b ′) of the amount of (b) is preferably 0.3 or more, more preferably 0 from the viewpoint of easily obtaining granules (I) having a gradually disintegrating behavior. .4 or more. In the granule before blending, the volume ratio (e-2 ′ / b ′) of the amount of granule (e-2 ′) and the amount of granule (b ′) in the particle size distribution by laser diffraction / scattering particle size distribution measurement is From the viewpoint of obtaining a granule (I) that has a gradually disintegrating behavior and can effectively enter even fine concave portions, it is preferably 1 or less, more preferably 0.95 or less. Further, in the granule before blending, the volume ratio (e-2 ′ / b ′) of the amount of the granule (e-2 ′) and the amount of the granule (b ′) in the particle size distribution by laser diffraction / scattering particle size distribution measurement. Is preferably 0.3 to 1, more preferably 0.4 to 0.95.

  In the granule before blending, the amount of the granule (e-2 ′) in the particle size distribution by laser diffraction / scattering particle size distribution measurement is entangled with the granule (a) and the granule (b) in the granule (I), From the viewpoint of ensuring the behavior of gradually disintegrating, it is preferably 2 to 15% by volume, more preferably 5 to 12% by volume, and still more preferably 7 to 12% by volume in the granule before blending.

  In addition, in the granule before blending, the amount of granules having a particle size of 350 μm or more in the particle size distribution measured by laser diffraction / scattering particle size distribution is preferably 5 to 50% by volume in the granule before blending, and more Preferably it is 10-45 volume%, More preferably, it is 15-42 volume%.

The average particle diameter r ′ (μm) of the granule before blending is preferably 50 μm or more, more preferably 75 μm or more, and further preferably 100 μm or more, from the viewpoint of having sufficient polishing power. From the viewpoint of suppressing the feeling of foreign matter, it is preferably 500 μm or less, more preferably 450 μm or less, and still more preferably 400 μm or less. And the average particle diameter r '(micrometer) of the granule before mixing becomes like this. Preferably it is 50-500 micrometers, More preferably, it is 75-450 micrometers, More preferably, it is 100-400 micrometers.
In addition, the average particle diameter r ′ of the granule before blending is a volume average particle diameter, and is a median diameter in a particle size distribution in a granule having a particle diameter of 50 μm or more measured by laser diffraction / scattering particle diameter distribution measurement.

The disintegration strength of the granule before blending is preferably 1 gf / piece or more, more preferably 2 gf / piece or more, from the viewpoint of ensuring a gradually disintegrating behavior and high dirt removal performance in the granule (I). Preferably it is 3 gf / piece or more. The disintegration strength of the pre-combination granule is preferably 20 gf from the viewpoint of imparting moderate disintegration even under a low load when using a soft toothbrush or the like in the granule (I), and reducing the feeling of foreign matter. / G or less, More preferably, it is 15 gf / piece or less, More preferably, it is 10 gf / piece or less, More preferably, it is 8 gf / piece or less. The disintegration strength of the granules is preferably 1 gf / piece or more and 20 gf / piece or less, preferably 2 to 15 gf / piece, more preferably 3 to 10 gf / piece, further preferably 3 to 8 gf. / Piece.
In addition, the disintegration strength of the granule before blending used in the present invention is a value when measured in a wet state, and is obtained by the same method as the disintegration strength of the granule (I). Moreover, in the granule before mixing, the disintegration strength in the wet state and the disintegration strength in the dry state are the same value.

Ratio (S _A '/ S _S ) of the area (S _A ') of the projection surface in the pre-combination granule and the area (S _S ') of the circumscribed circle whose diameter is the maximum passing diameter (D _L ') on the projection surface The average value of ') is preferably 0.5 or more, more preferably 0.6 or more, and still more preferably, from the viewpoint of imparting a gradually disintegrating behavior to the granules (I) obtained from the pre-mixing granules. Is 0.65 or more. Ratio (S _A '/ S _S ) of the area (S _A ') of the projection surface in the pre-combination granule and the area (S _S ') of the circumscribed circle whose diameter is the maximum passing diameter (D _L ') on the projection surface The average value of ') is preferably 0.9 or less, more preferably from the viewpoint of expressing moderate disintegration in the granule (I) obtained by the pre-combination granule and effectively transmitting the load from the toothbrush. Is 0.85 or less. In addition, the area of the projection surface (S _A ′), the maximum passing diameter (D _L ′), the area of the circumscribed circle having this diameter (S _S ′), and the ratio (S _A ′ / S _S ′) ) Average values are values obtained by the same method as for the granule (I).

The average value of the ratio (D _L ′ / D _S ′) between the maximum delivery diameter (D _L ′) and the minimum delivery diameter (D _S ′) on the projection surface of the pre-combination granule is irregular depending on the pre-combination granule. From the viewpoint of obtaining granules (I) exhibiting a gradually disintegrating behavior, it is preferably 1.2 or more, more preferably 1.3 or more, and even more preferably 1.5 or more. The average value of the ratio (D _L ′ / D _S ′) between the maximum delivery diameter (D _L ′) and the minimum delivery diameter (D _S ′) on the projection surface of the pre-combination granule is the granule ( From the viewpoint of I) expressing moderate disintegration and effectively transmitting the load from the toothbrush, it is preferably 2 or less, more preferably 1.8 or less, and even more preferably 1.75 or less. . Moreover, the average value of the ratio (D _L '/ D _S ') between the maximum delivery diameter (D _L ') and the minimum delivery diameter (D _S ') on the projection surface of the granule before blending is preferably 1.2 to It is 2, More preferably, it is 1.3-1.8, More preferably, it is 1.5-1.75.

In order to obtain the granule (I) having a specific shape or a specific particle size distribution as described above, which is present in the dentifrice composition of the present invention, after adding a binder described later to the dentifrice composition, before compounding It is preferred to blend the granules into the dentifrice composition. Furthermore, in the step after blending the binder into the dentifrice composition, the stirring speed for stirring the dentifrice composition after adding the pre-blend granules to the dentifrice composition depends on the stirrer and the stirring time. It is preferable to stir at 10 rpm or more, more preferably to stir at a stirring speed of 20 rpm or more, preferably to stir at a stirring speed of 250 rpm or less, and preferably to stir at a stirring speed of 10 to 250 rpm, stirring speed 20 rpm. It is more preferable to stir at 250 pm or less. In order to stir the dentifrice composition at such a stirring speed, for example, a universal mixing stirrer (5XDMV-10-r, manufactured by Dalton), a paddle mixer (TK paddle mixer 2SL-10, Special Equipment Co., Ltd.) and the like are known. In the case of using the universal mixing stirrer, the rotational stirring speed is preferably 40 to 230 rpm, more preferably 90 to 200 rpm, and the revolving stirring speed. Is preferably 20 to 110 pm, more preferably 35 to 75 rpm. When the paddle mixer is used, the paddle stirring speed is preferably 10 to 70 rpm, and the turbine stirring speed is preferably 20 to 90 rpm. In the stirring of the dentifrice composition, it is only necessary to disperse the granules in the dentifrice composition. If the stirring speed is low, the stirring time may be increased, and if the stirring speed is high, the stirring time is increased. It only takes a short time. From this viewpoint, the stirring time is preferably 5 minutes to 90 minutes, and more preferably 10 minutes to 60 minutes.
In the manufacturing method of the dentifrice composition of this invention, after adding the granule before a mixing | blending, it is preferable to provide the process of stirring this dentifrice composition. By providing such a step, the pre-combination granule having a broad particle size distribution contains many granules having a particle size of 100 to 200 μm and has a particle size distribution containing many particle sizes smaller than the particle size of the peak of the particle size distribution ( I) can be obtained.

  The content of the component (I) is 2% by mass or more in the dentifrice composition of the present invention from the viewpoint of realizing imparting a smooth feel while enhancing the soil removing ability, and enhancing the sustainability thereof, preferably It is 3% by mass or more, more preferably 4% by mass or more, and further preferably 5% by mass or more. The content of component (I) is 40% by mass or less, preferably 25% by mass or less, more preferably 20% by mass or less, from the viewpoint of suppressing an excessive granular feeling.

  The dentifrice composition of the present invention comprises 3 masses of abrasive powder (II) selected from abrasive calcium carbonate, zeolite, and abrasive silica having an RDA value of 160 or less and an average particle diameter of 1 μm to 15 μm. % Or more and 15% by mass or less. By containing the component (II) in such an amount, it is intertwined with the component (I) having a characteristic of gradually disintegrating when a load from the toothbrush is applied, and is fine as about 50 μm like the frequency of a tooth. A smooth feel can be maintained on the surface of the tooth while exhibiting a high dirt removing ability up to the recess.

  The RDA value of the abrasive silica of the component (II) is 160 from the viewpoint of realizing a smooth feel while enhancing the dirt removing ability, and enhancing the sustainability, and preventing wear of the dentin and the like of the tooth. Or less, preferably 150 or less, more preferably 130 or less. The RDA value of the abrasive silica of component (II) is preferably 50 or more, more preferably 80 or more, and still more preferably 100 or more, from the viewpoint of ensuring high stain removal ability. The RDA value of the abrasive silica of component (II) is preferably 50 to 160, more preferably 80 to 130, and further preferably 100 to 130. Here, as the RDA value, a value measured for 10% abrasive slurry according to the method of Hefferren et al. Is used (J. Dent. Res. 55, 1967, pp 563).

  The oil absorption amount of the abrasive silica of component (II) is preferably 80 to 150 mL / 100 g, more preferably 90 to 130 mL / 100 g, from the viewpoint of effectively enhancing the dirt removing ability in combination with component (I). . Here, the amount of oil absorption indicates the amount of oil that can be supported by silica, and the measurement method is based on the method based on JIS K5101-13-2 (established in 2004), depending on the amount of oil absorbed in the boiled sea bream. Identify. As the abrasive silica of component (II), SYROPURE30 (manufactured by Fuji Silysia Chemical), thixosyl (manufactured by Rhodia), sorbosyl (manufactured by Ineos silica), fine seal (manufactured by Tokuyama), nip gel (manufactured by Tosoh Silica) Commercial products can be used.

  The heavy calcium carbonate of component (II) has an average particle size of preferably 0.1 to 20 μm, more preferably 0.5 to 10 μm, and still more preferably from the viewpoint of preventing the tooth dirt removal ability and foreign matter feeling. Is 1-5 μm. The average particle diameter can be measured with a laser diffraction / scattering particle size distribution measuring apparatus. Heavy calcium carbonate is commercially available as calcium carbonate, and is also used as a food additive. It is not purified by chemical synthesis reaction, but limestone and shells containing calcium carbonate are selected and cleaned. The crushed product is pulverized into a white powder.

  The average particle size of the component (II) zeolite is preferably 0.5 to 10 μm, more preferably 1 to 8 μm, and further preferably 2 to 7 μm. The average particle diameter can be measured with a laser diffraction / scattering particle size distribution measuring apparatus.

  The content of the component (II) is 3% by mass or more in the dentifrice composition of the present invention from the viewpoint of realizing imparting a smooth feel while enhancing the dirt removing ability and enhancing the durability thereof, preferably It is 4 mass% or more, More preferably, it is 5 mass% or more. The content of component (II) is 15% by mass or less, preferably 12% by mass or less, more preferably 12% by mass or less in the dentifrice composition of the present invention, from the viewpoint of preventing wear such as dentin of teeth. It is 10 mass% or less. Moreover, content of component (II) is 3 to 15 mass% in the dentifrice composition of this invention, Preferably it is 4 to 12 mass%, More preferably, it is 5 to 10 mass%. is there.

The dentifrice composition of the present invention can further contain a binder (III). Specific examples of the component (III) include xanthan gum, tragacanth gum, gum arabic, guar gum, karaya gum, locust bean gum, gellan gum, tamarind gum, psyllium seed gum, tara gum, quince seed gum, and hydroxypropyl guar gum. Of gum;
Minerals such as smectite, montmorillonite and bentonite;
Sodium polyacrylate, polyvinyl alcohol, carboxyvinyl polymer, polyvinylpyrrolidone, methylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose or alkali metal salts thereof, sodium alginate, pectin, sodium chondroitin sulfate, methoxyethylene maleic anhydride copolymer, Natural or synthetic organic substances such as propylene glycol alginate, carrageenan, sodium caseinate, curdlan, pullulan;
Examples include natural or synthetic inorganic substances such as laponite, bee gum, silica gel or metal-containing silica gel, gelatin, and agar, or organic-inorganic composites. These components (III) may be used alone or in combination of two or more. Among these, from the viewpoint of imparting an appropriate feeling of use, one or more selected from sodium carboxymethylcellulose, xanthan gum, sodium alginate, and carrageenan are preferable.

  The content of component (III) is preferably 0 in the dentifrice composition of the present invention from the viewpoints of enhancing the smooth feel, providing a good feeling of use, ensuring shape retention, storage stability, and the like. It is 0.1-3 mass%, More preferably, it is 0.2-2 mass%, More preferably, it is 0.3-1.8 mass%.

The dentifrice composition of the present invention can further contain an anionic surfactant (IV). Specific examples of the component (IV) include N-acyl amino acid salts such as N-acyl taurine salt, N-methyl long chain acyl taurine salt, N-acyl glutamate, and N-lauroyl sarcosine sodium;
Alkyl sulfates such as sodium lauryl sulfate and sodium myristyl sulfate; alkyl phosphates such as sodium alkyl phosphate; higher fatty acid sulfonated monoglyceride salts; fatty acid ester salts such as isethionate;
Polyoxyalkyl phosphates such as polyoxyethylene monoalkyl phosphate;
Alkylbenzene sulfonates such as sodium dodecylbenzene sulfonate;
Alkyl sulfoacetates such as sodium lauryl sulfoacetate;
An α-olefin sulfonate may be mentioned. These components (IV) may be used alone or in combination of two or more. Among these, from the viewpoint of enhancing plaque removing ability or dirt removing ability, one or more selected from N-acyl taurine salts, N-acyl glutamates, N-lauroyl sarcosine salts, and sodium lauryl sulfate are preferable.
The content of component (IV) is preferably 0.2 to 3 mass in the dentifrice composition of the present invention from the viewpoint of enhancing plaque removal ability or dirt removal ability and providing a good feeling of use. %, More preferably 0.4-2% by mass, and even more preferably 0.7-1.8% by mass.

Furthermore, for example, when N-acylamino acid or a salt thereof is used as the anionic surfactant (IV), the N-acylamino acid has a viewpoint of exerting an adhesion inhibitory effect and a removal effect of protein soil, as well as a good feeling of use and foaming. From the viewpoint of acid resistance, N-acyl acidic amino acids are preferred, acyl glutamic acid and acyl aspartic acid are more preferred, and the acyl group is preferably myristoyl, cocoyl, lauryl, specifically, for example, N-lauroyl glutamic acid, N-myristoyl glutamic acid is more preferred. Moreover, as a salt, an alkali metal salt is preferable and a sodium salt is preferable. The content of such N-acyl amino acid salt is preferably 0.005 to 0.3% by mass, more preferably 0.007 to 0.2% by mass in the dentifrice composition of the present invention, Preferably it is 0.01-0.1 mass%. Moreover, when using N-acylamino acid or its salt, it is preferable to use pyrophosphoric acid or its salt together. The content of such pyrophosphoric acid or a salt thereof is preferably 0.005 to 0.5 mass%, more preferably 0.01 to 0.4 mass% in the dentifrice composition of the present invention, Preferably it is 0.01-0.2 mass%. The mass ratio of pyrophosphoric acid or a salt thereof to N-acylamino acid or a salt thereof (pyrophosphoric acid or a salt thereof / N-acylamino acid or a salt thereof) is preferably 0.05 to 40, more preferably 0. The total content of pyrophosphoric acid or a salt thereof and N-acylamino acid or a salt thereof is preferably 0.01 in the dentifrice composition of the present invention. It is -0.6 mass%, More preferably, it is 0.02-0.45 mass%, More preferably, it is 0.02-0.3 mass%.
When the alkyl sulfate is used in combination, the mass ratio of the alkyl sulfate to the N-acyl amino acid or a salt thereof (alkyl sulfate / N-acyl amino acid or a salt thereof) is preferably 5 to 200, more preferably 10 ~ 150.
Moreover, it is preferable to use together N-acylamino acid or its salt, and the nonionic surfactant mentioned later.
Furthermore, it is preferable to use N-acylamino acid or a salt thereof and phytic acid or a salt thereof in combination from the viewpoint of providing good astringency, dirt removing performance, and whitening effect of teeth.

The dentifrice composition of the present invention may contain a surfactant other than the anionic surfactant of the above component (IV). Such surfactants include cationic surfactants such as alkylammonium and alkylbenzylammonium salts;
Polyoxyethylene hydrogenated castor oil, sucrose fatty acid ester, sorbitan fatty acid ester, glycerin fatty acid ester such as pentaglyceryl monomyristic acid, alkyl glucoside, polyglycerin fatty acid ester, polyoxyethylene monoalkyl (or alkenyl) ether, polyoxyethylene poly Oxypropylene copolymers, polyoxyethylene alkylphenyl ethers such as polyoxyethylene nonylphenyl ether, amine oxide surfactants, fatty acid alkanolamides such as mono- (or di-) ethanolamide, coconut oil fatty acid diethanolamide, and Glycerin fatty acid esters such as monoglyceryl stearate and decaglyceryl monostearate, polyglycerin fatty acid esters such as decaglyceryl laurate, Nonionic surfactant is a polyglycol such as polyethylene polypropylene glycol;
Betaine acetate such as lauryldimethylaminoacetic acid betaine, imidazolinium betaine such as 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolium betaine, alkylsulfobetaine such as lauryl sulfobetaine and lauryl hydroxysulfobetaine, coconut oil fatty acid Examples include amphoteric surfactants that are coconut oil fatty acid amide alkylbetaines such as amidopropylbetaine, and long-chain alkylimidazoline betaine salts such as sodium N-alkyl-1-hydroxyethylimidazoline betaine. Among these, one or more nonionic surfactants selected from polyoxyethylene hydrogenated castor oil, polyglycerin fatty acid ester, sucrose fatty acid ester, sorbitan fatty acid ester, and polyoxyethylene sorbitan fatty acid ester are preferable.
The content of the surfactant other than the anionic surfactant of the component (IV) is the dentifrice composition of the present invention from the viewpoint of ensuring high plaque removing ability or dirt removing ability and maintaining a good feeling of use. In a thing, Preferably it is 5 mass% or less, More preferably, it is 3 mass% or less.

  In addition, it is preferable to use a nonionic surfactant as a surfactant other than the component (IV) together with the anionic surfactant of the component (IV), and further use a potassium ion supply compound. Thereby, the moderate viscosity in a dentifrice composition is maintained, the viscosity rise at the time of low-temperature preservation | save is suppressed, and the extrusion property from the tube container which stored dentifrice composition can be made favorable. Furthermore, the storage stability of fungicides and anti-inflammatory agents such as triclosan, isopropylmethylcellulose, glycyrrhetinic acid and tocopherol can also be improved. These contents are, for example, 0.5 to 3.0% by mass of the anionic surfactant of component (IV), 1.2 to 3% by mass of the nonionic surfactant in the dentifrice composition of the present invention, And 0.1 to 3.0% by mass of potassium ion supply compound in terms of potassium atom, and preferably 0.1 to 5% by mass of sodium ions. As the anionic surfactant of component (IV) in this case, sodium acyl glutamate, sodium acyl sarcosine, sodium alkyl phosphate, alkyl sulfate ester salt, methyl acyl taurate sodium, polyoxyethylene monoalkyl phosphate, etc. are preferable. These contents are preferably 0.2 to 4% by mass, more preferably 0.5 to 2% by mass in the dentifrice composition of the present invention. Further, as the nonionic surfactant, polyoxyalkylene surfactant, amine oxide, mono- or diethanolamide, sorbitan fatty acid ester, glycerin fatty acid ester, polyglycerin fatty acid ester, sucrose fatty acid ester, polyoxyethylene hydrogenated castor oil are preferable. In the dentifrice composition of the present invention, the content is preferably 1.2 to 3% by mass, more preferably 1.3 to 2.5% by mass, and still more preferably 1.3 to 2.5% by mass. 2.0% by mass. As the potassium ion supply compound, potassium hydroxide, potassium nitrate, potassium citrate, potassium citrate, calcium phosphate, and potassium chloride are preferable, and the content thereof is preferably in terms of potassium atom in the dentifrice composition of the present invention, preferably It is 0.1-3 mass%, More preferably, it is 0.5-2.0 mass%. Further, fluorides such as sodium fluoride, potassium fluoride, and ammonium fluoride may be contained.

  In addition, when polyoxyethylene hydrogenated castor oil is used as a surfactant other than component (IV), another nonionic surfactant selected from polyoxyethylene sorbitan fatty acid ester, polyglycerin fatty acid ester, and sucrose fatty acid ester is used in combination. It is preferable to do. At this time, the mass ratio of the polyoxyethylene hydrogenated castor oil and other nonionic surfactant (polyoxyethylene hydrogenated castor oil / nonionic surfactant) is preferably 0.2 to 5, more preferably 0.5. It is -4, More preferably, it is 0.5-2, More preferably, it is 0.5-1.7, More preferably, it is 0.7-1.5. The content of such polyoxyethylene hydrogenated castor oil is preferably 0.01 to 10% by mass, more preferably 0.15 to 5% by mass, and still more preferably 0.3 to 3% by mass.

  The dentifrice composition of the present invention can further contain a wetting agent (V). The component (V) is specifically selected from, for example, sorbitol, glycerin, propylene glycol, 1,3-butylene glycol, ethylene glycol, polyethylene glycol, polypropylene glycol, xylitol, maltitol, lactitol, erythritol, and the like. 1 type or 2 types or more are mentioned. Of these, one or more selected from sorbitol, glycerin, propylene glycol, and polyethylene glycol are preferred from the viewpoints of good usability, storage stability, and dispersibility improvement in the oral cavity. The content of component (V) is effectively diffused in the oral cavity while dissolving and dispersing the above components, effectively exerting the plaque or dirt removal effect by the gradually disintegrating component (I) granules, and the interface From the viewpoint of providing good foaming in combination with the active agent, the dentifrice composition of the present invention is preferably 5 to 70% by mass, more preferably 10 to 60% by mass, and further preferably 15 to 50% by mass. It is. For example, when glycerin is used, the content thereof is preferably 4 to 35% by mass in the dentifrice composition of the present invention, and the mass ratio ((I) / glycerin) of the granule of component (I) to glycerin is Preferably, it is 0.1-10. When sorbitol liquid (70%) is used as sorbitol, the content thereof is preferably 25 to 45% by mass in the dentifrice composition of the present invention, and the mass ratio of the granule of component (I) and sorbitol liquid ( (I) / sorbitol solution) is preferably 0.1 to 10. When polyethylene glycol is used, its number average molecular weight is preferably 1000 or less, and its content is preferably 1 to 7% by mass in the dentifrice composition of the present invention. The mass ratio of polyethylene glycol ((I) / sorbitol) is preferably 0.5 to 10. When propylene glycol is used, the content thereof is preferably 1 to 7% by mass in the dentifrice composition of the present invention, and the mass ratio of the component (I) granules to propylene glycol ((I) / propylene glycol) Is preferably 0.5-10.

  The dentifrice composition of the present invention may further contain water. The content of water is such that the above components are effectively dispersed in the oral cavity while dissolving and dispersing, effectively exerting the plaque or dirt removal effect by the gradually disintegrating granules, and a low load applied by a soft toothbrush etc. However, it is preferably 10% by mass or more, and more preferably 12% by mass or more in the dentifrice composition of the present invention from the viewpoint of exhibiting high dirt removing ability and providing good foaming in combination with the surfactant. More preferably, it is 15% by mass or more, preferably 50% by mass or less, more preferably 45% by mass or less, and further preferably 40% by mass or less. In addition, the content of water is preferably 10 to 50% by mass in the dentifrice composition of the present invention, from the viewpoint of providing good solubility and dispersibility, and plaque or dirt removal ability, and more preferably It is 12-45 mass%, More preferably, it is 15-40 mass%. The water content can be calculated from the blended moisture content and the blended moisture content in other components, but can be measured, for example, with a Karl Fischer moisture meter. As the Karl Fischer moisture meter, for example, a trace moisture measuring device (Hiranuma Sangyo Co., Ltd.) can be used. In this apparatus, 5 g of the dentifrice composition can be taken and suspended in 25 g of anhydrous methanol, and 0.02 g of this suspension can be collected to determine the water content as the water content. The ratio ((I) / water content) of the granule of component (I) and the amount of water (water content) in the dentifrice composition of the present invention is good solubility and dispersibility, and plaque or dirt. From the viewpoint of providing removal ability, 0.02 to 15 is preferable, 0.1 to 6 is more preferable, and 0.2 to 3 is more preferable.

The dentifrice composition of the present invention is a component other than the above, for example, abrasives other than the above component (II), sweeteners, preservatives, fragrances, medicinal components, colorants, as long as the effects of the present invention are not impaired. In addition, other commonly used components can be contained. In addition, the content of the abrasive other than the component (II) is preferably 3% by mass or less, more preferably 1 in the dentifrice composition from the viewpoint of suppressing harmfulness and improving the cleaning performance by granules. It is not more than mass%, more preferably not more than 0.5 mass%.
The other components described above may be used alone or in combination of two or more.

  For example, when orthophosphoric acid or a salt thereof and polyphosphoric acid or a salt thereof are used, these contents are preferably contained in the dentifrice composition of the present invention from the viewpoint of achieving both moderate astringency and a good soil removal effect. Is 0.001 to 10% by mass, more preferably 0.001 to 0.2% by mass, still more preferably 0.003 to 0.09% by mass, and still more preferably 0.005 to 0%. 0.04% by mass. Such polyphosphoric acid or a salt thereof is preferably one or more selected from pyrophosphoric acid, tripolyphosphoric acid, tetrapolyphosphoric acid, metaphosphoric acid, trimetaphosphoric acid, and salts thereof, pyrophosphoric acid, tripolyphosphoric acid and salts thereof Is more preferable, and pyrophosphoric acid or a salt thereof is more preferable. The polyphosphate is preferably an alkali metal salt, a salt selected from sodium and potassium is preferable, and a sodium salt is more preferable. Orthophosphoric acid or a salt thereof is preferably trisodium phosphate or tripotassium phosphate. The mass ratio of the granule of component (I) to orthophosphoric acid or a salt thereof and polyphosphoric acid or a salt thereof ((I): orthophosphoric acid or a salt thereof and polyphosphoric acid or a salt thereof) is preferably 1: 0.001 It is 1: 0.008, More preferably, it is 1: 0.002 to 1: 0.0075, More preferably, it is 1: 0.003 to 1: 0.007.

  Further, when sugar alcohol is used, it is preferable to use erythritol, reduced palatinose (palatinite), mannitol, and the content thereof is from the point of remineralization in combination with refreshing feeling, cooling feeling, and fluoride. In the dentifrice composition, the content is preferably 25 to 50% by mass, and the water content in this case is preferably 10 to 50% by mass, more preferably 12 to 45% by mass, and still more preferably. 15 to 40% by mass. The mass ratio ((I): sugar alcohol) between the granule of component (I) and these sugar alcohols is preferably 1:10 to 1: 1, more preferably 1 from the viewpoint of clean feeling and feeling of use. : 5 to 1: 1, and further preferably contains a fluoride. In the case of containing fluoride, it is preferable to use xylitol as the sugar alcohol, and the content of such xylitol is preferably 10 to 10 in the dentifrice composition of the present invention from the viewpoint of caries suppression by the combined use with fluoride. 60% by mass.

Moreover, it is preferable to contain 1 type, or 2 or more types of organic acids chosen from lactic acid, malic acid, liquor acid, citric acid, glycolic acid, and succinic acid as a pH adjuster.
Furthermore, thickening silica can also be used, and the content of such thickening silica is preferably 3 to 12% by mass, more preferably 4 to 10% by mass in the dentifrice composition of the present invention, More preferably, it is 5 to 8% by mass, and the mass ratio of the granule of component (I) to the thickening silica ((I) / thickening silica) is preferably 0.5 to 5. As such a thickening silica, the oil absorption is preferably 150 to 500 mL / 100 g, more preferably 200 to 500, from the viewpoints of shape retention, light usability, taste, foaming, and good dispersibility in the oral cavity. It is 400 mL / 100g, More preferably, it is 250-380 mL / 100g, An average particle diameter becomes like this. Preferably it is 1-10 micrometers, More preferably, it is 1.5-9 micrometers, More preferably, it is 2-8 micrometers. As such thickening silica, for example, commercially available products such as SYROPURE25 (manufactured by Fuji Silysia Chemical) and SORBOSILTC15 (manufactured by CROSFIELD) can be used. The amount of oil supply is a value measured according to JISK5101-13-2. Further, the thickening silica and the calcium compound can be used in combination, and the content of the calcium compound is preferably 0.003 to 0.05% by mass in terms of calcium atom in the dentifrice composition of the present invention. Yes, more preferably 0.004 to 0.04 mass%, and still more preferably 0.06 to 0.02 mass%. As such a calcium compound, a water-soluble calcium compound having a solubility in water at 20 ° C. of 2 to 100 g / 100 mL is preferable. Specifically, for example, calcium chloride, calcium lactate, calcium benzoate, calcium acetate, calcium formate, And one or more selected from calcium propionate.

  Moreover, it is preferable to use together malic acid or its salt and orthophosphoric acid or its salt. As a result, it is possible to bring about the effect of removing tooth spots by malic acid while suppressing acidity and maintaining a good flavor. The content of malic acid or a salt thereof is preferably 25 to 1000 mmol / kg, more preferably 28 to 900 mmol / kg, still more preferably 30 to 800 mmol / kg in the dentifrice composition of the present invention. And more preferably 80 to 350 mmol / kg. The content of orthophosphoric acid or a salt thereof is preferably 1 to 800 mmol / kg, more preferably 5 to 700 mmol / kg, and still more preferably 10 to 500 mmol / kg. In this case, it is preferable to use an alkali metal monohydrogen phosphate as orthophosphoric acid or a salt thereof, and the pH of the dentifrice composition of the present invention is preferably 7 to 11, more preferably 7.5 to 11, and still more preferably. It is good to adjust to 7.5 to 9.5, more preferably 7.8 to 8.5.

Further, powdered cellulose and low etherification degree carboxymethylcellulose or a salt thereof may be used in combination. By using these in combination with the granule (I), the foamability and foam quality can be improved, and the flavor can be improved.
Powdered cellulose is a cellulose having an average degree of polymerization of more than 350 and not more than 2250. Not only the degree of polymerization and the degree of crystallization are different from those of crystalline cellulose having an average degree of polymerization of 350 or less, but the cellulose has significantly different physical properties. .
Low etherification degree carboxymethylcellulose or its salt is carboxymethylcellulose or its salt whose etherification degree is 0.1-0.6. Carboxymethylcellulose having a degree of etherification outside the above range or a salt thereof is used as a binder because it has a thickening action, whereas the low degree of etherification degree carboxymethylcellulose or a salt thereof has such a thickening action. Specifically, the viscosity of a 1% aqueous solution at 25 ° C. is preferably less than 200 mPa · s, more preferably 1 to 150 mPa · s, and more preferably 10 to 150 mPa · s. preferable. Examples of commercially available products include Sunrose SLD-F1 and Sunrose SLD-FM manufactured by Nippon Paper Chemicals. The more preferable degree of etherification of the low degree of etherification carboxymethylcellulose or a salt thereof is 0.1 to 0.5, and more preferably 0.2 to 0.4. The degree of etherification refers to the degree of substitution of carboxymethyl groups per glucose unit. The degree of etherification can be obtained, for example, according to the CMC industry association analysis method (ashing method). Weigh precisely 1 g of sodium carboxymethylcellulose, put it in a magnetic crucible, incinerate at 600 ° C., titrate sodium oxide produced by incineration with N / 10 sulfuric acid using phenolphthalein as an indicator, and titrate per 1 g of sodium carboxymethylcellulose. YmL can be calculated by putting it in the following formula and the obtained degree of etherification can be shown.
Degree of etherification = (162 × Y) / (10,000-80 × Y)
In the dentifrice composition of the present invention, the content of powdered cellulose and the low etherification degree carboxymethylcellulose or a salt thereof is preferably 0.05 to 5% by mass, more preferably 0.1 to 2.5% by mass. %, More preferably 0.2 to 1% by mass, and still more preferably 0.2 to 0.8% by mass. Also, the mass ratio of granules (I) to powdered cellulose, and low etherification degree carboxymethylcellulose or a salt thereof (granule (I) / powdered cellulose, and low etherification degree carboxymethylcellulose or a salt thereof) has good foaming and fineness. From the viewpoint of providing a good foam quality and improving the shape retention, it is preferably 10-30.

  Moreover, you may contain the resin powder. By using this together with the granule (I), foamability and foam quality can be improved, squeak can be suppressed, and a refreshing feeling and stability can be improved. Examples of the resin powder include one or more selected from polyolefin resin (polyethylene, polypropylene) powder and polyamide resin (nylon) powder. The average particle diameter of the resin powder is preferably 5 to 500 μm, and the content of the resin powder is preferably 0.1 to 10% by mass in the dentifrice composition of the present invention, more preferably. It is 0.3-5 mass%, More preferably, it is 0.5-2 mass%.

Furthermore, a quaternary ammonium salt may be used. By using such a component, the sterilization effect can be improved. Examples of the quaternary ammonium salt include one or more selected from benzethonium chloride, cetylpyridinium chloride, benzalkonium chloride, and the like. The content of the quaternary ammonium salt is preferably 100 to 2500 parts by mass, more preferably 200 to 2000 parts by mass with respect to 1 part by mass of the quaternary ammonium salt. More preferably, it is 300-1300 mass parts. In addition, when such a quaternary ammonium salt is contained, the pH when the dentifrice composition of the present invention is diluted 10 times is preferably 8 to 11.5, more preferably 8.5 to 11.3. Yes, more preferably 9-11.
Further, it is preferable to use a wetting agent together with the quaternary ammonium salt. Examples of the wetting agent include one or more selected from sorbitol, propylene glycol, 1,3-butylene glycol, ethylene glycol, polyethylene glycol, polypropylene glycol, xylitol, maltitol, lactol, and erythritol. The content of the wetting agent is preferably 1 to 60 parts by mass, more preferably 5 to 55 parts by mass, and further preferably 10 to 50 parts by mass with respect to 1 part by mass of the quaternary ammonium salt. .

Furthermore, you may use the 1 type, or 2 or more types of oil-soluble active ingredient chosen from (beta) -glycyrrhetic acid or its salt, a tocopherol, a triclosan, and isopropylmethylphenol. Among these, from the viewpoint of imparting anti-inflammatory properties, it is preferable to use one or two oil-soluble active ingredients selected from β-glycyrrhetinic acid or a salt thereof and tocopherol, from the viewpoint of imparting a bactericidal effect. It is preferable to use one or two oil-soluble active ingredients selected from triclosan and isopropylmethylphenol.
Examples of tocopherol include dl-α-tocopherol acetate and tocopherol nicotinate, and the content thereof is preferably 0.01 to 0.5% by mass in the dentifrice composition of the present invention, more preferably 0.05 to 0.2% by mass.
Triclosan is a halogenated diphenyl ether type bactericide having a broad antibacterial spectrum, and its chemical name is 2 ′, 4,4′-trichloro-2-hydroxydiphenyl ether. For example, Ciba Specialty Chemicals Co., Ltd. To marketed products sold under the trade name of Iruga Care MP. The content of the trichlosan is preferably 0.001 to 0.05% by mass and more preferably 0.005 to 0.02% by mass in the dentifrice composition of the present invention.
Isopropylmethylphenol is 1-hydroxy-4-isopropyl-3-methylphenol and is also referred to as 3-methyl-4-isopropylphenol and cymene-5-ol. For example, a marketed product sold by Osaka Kasei Co., Ltd. as a trade name biosome can be used. The content of the isopropylmethylphenol is preferably 0.001 to 0.05% by mass, more preferably 0.005 to 0.02% by mass in the dentifrice composition of the present invention.
β-glycyrrhetinic acid is 3β-hydroxy-11-oxooleana-12-ene-30-carboxylic acid obtained by hydrolyzing glycyrrhizic acid obtained from licorice or the like. Examples of the salt of β-glycyrrhetinic acid include alkali metal salts such as sodium salt and potassium salt, and alkaline earth metal salts such as calcium salt. Of these, β-glycyrrhetinic acid is preferred. The content of β-glycyrrhetinic acid or a salt thereof is preferably 0.001 to 0.05% by mass, more preferably 0.005 to 0.02% by mass in the dentifrice composition of the present invention. .
Since the oil-soluble active ingredient is easily adsorbed to the polyethylene layer when the inner layer of the tube container storing the dentifrice composition of the present invention is a polyethylene layer, from the viewpoint of suppressing such adsorption and storage stability, It is preferable to contain a nonionic surfactant. Moreover, it is preferable to contain 2 or more types of nonionic surfactant from a viewpoint of improving the storage stability of the said oil-soluble active ingredient, favorable foaming, and suppressing a low temperature viscosity raise.

In order to obtain granules (I) having a specific shape or a specific particle size distribution as described above contained in the dentifrice composition of the present invention, the above-mentioned binder (III) is added to the dentifrice composition. It is preferable to blend the granules before blending and (II) the abrasive powder into the dentifrice composition. Further, in the step after the binder (III) is blended in the dentifrice composition, the stirring speed of stirring the dentifrice composition after adding the granule before blending and (II) abrasive powder to the dentifrice composition. Depending on the stirring device and stirring time, stirring is preferably performed at 10 rpm or more, more preferably stirring at a stirring speed of 20 rpm or more, stirring at a stirring speed of 250 rpm or less, and stirring speed of 10 rpm or more and 250 rpm. It is preferable to stir below, and it is more preferable to stir at a stirring speed of 20 rpm to 250 pm. In order to stir the dentifrice composition at such a stirring speed, for example, a universal mixing stirrer (5XDMV-10-r, manufactured by Dalton), a paddle mixer (TK paddle mixer 2SL-10, Special Equipment Co., Ltd.) and the like are known. In the case of using the universal mixing stirrer, the rotational stirring speed is preferably 40 to 230 rpm, more preferably 90 to 200 rpm, and the revolving stirring speed. Is preferably 20 to 110 pm, more preferably 35 to 75 rpm. When the paddle mixer is used, the paddle stirring speed is preferably 10 to 70 rpm, and the turbine stirring speed is preferably 20 to 90 rpm. In the stirring of the dentifrice composition, it is only necessary to disperse the granules in the dentifrice composition. If the stirring speed is low, the stirring time may be increased, and if the stirring speed is high, the stirring time is increased. It only takes a short time. From this viewpoint, the stirring time is preferably 5 minutes to 90 minutes, and more preferably 10 minutes to 60 minutes.
In the method for producing a dentifrice composition of the present invention, it is preferable to include a step of stirring the dentifrice composition after adding the granules before blending and (II) the abrasive powder. By providing such a step, the pre-combination granule having a broad particle size distribution contains many granules having a particle size of 100 to 200 μm and has a particle size distribution containing many particle sizes smaller than the particle size of the peak of the particle size distribution ( I) can be obtained.

  Hereinafter, the present invention will be specifically described based on examples. In addition, unless otherwise indicated in a table | surface, content of each component shows the mass%. Moreover, each physical property value was measured by the following method.

<< 1: Measuring method of average particle diameter of water-insoluble powder >>
The average particle size of the water-insoluble powder was measured with a laser diffraction / scattering particle size distribution analyzer (LA-920, manufactured by HORIBA), solvent: ion-exchanged water, refractive index: 1.2, circulation rate (scale: 4), It measured on the conditions of stirring speed (scale: 3).

<< 2: Solid content of sodium silicate >>
Using a dropper, spray 2.5 g of the sample onto an aluminum container with a diameter of 11.5 cm so that one drop is about 5 to 10 mm in diameter (so that the droplets do not overlap as much as possible), and then , Using an infrared moisture meter (FD240, manufactured by Kett Science Laboratory Co., Ltd.) in a moisture reference moisture measurement mode, the temperature is 105 ° C., the condition of Auto (the amount of change in the measured value is within 0.05% in 30 seconds) It was calculated by removing the volatilized free water measured in the above).

<< 3: Measurement method of particle size distribution and average particle size of pre-blend granule >>
It measured using the aqueous solution which diluted the granule before mixing to 5 mass% with ion-exchange water. An aqueous solution obtained by diluting the granule before blending to 5% by mass with ion-exchanged water was dispersed with a mixer (ROTARY MIXER NPC-20, manufactured by NISSIN) at 75 rpm / horizontal rotation for 2 hours. . Next, the aqueous solution in which the granules were dispersed was stored at room temperature (25 ° C.) for 1 day. The aqueous solution after storage was again dispersed for 10 minutes by the mixer, and then the aqueous solution was used to measure a refractive index of 1 with a laser diffraction / scattering particle size distribution analyzer (Partica LA-950V2, manufactured by HORIBA). .58, circulation rate (scale: 5), stirring speed (scale: 5). In addition, ion-exchange water was used as a solvent.

<< 4: Projection surface area (S _A ), maximum passing diameter (D _L ), circumscribed circle area (S _S ) and minimum passing diameter (D _S ) with D _L as the diameter in granules (I) in dentifrice ) >>
(I) The area of the projection surface of the granule (I) is the amount of the dentifrice aqueous solution diluted to 10% by mass with purified water, washed with purified water using a JISZ8801-1 standard 150 μm sieve, and remains on the sieve. The measured granules were measured using granules dried at room temperature (25 ° C.) for 1 day.
(Ii) The area of the projection surface (S _A ), the maximum passing diameter (D _L ), and the minimum passing diameter (D _S ) are measured using KEENCE VH-5500 (magnification 100 times), and the taken digital image using the analysis software (WinROOF (Mitsuya Shoji Co.), the area (S _a in one projection plane of the individual granules), the maximum distance across the diameter (D _L), to obtain the minimum distance across the diameter (D _S). by averaging the data of 5-10 granules obtained by measuring the area in an projection plane of each granule (S _a), the maximum distance across the diameter (D _L), and the minimum distance across the diameter (D _S). Based on these data, the ratio (S _A / S _S ) of the area (S _A ) on one projection plane of the granule and the area (S _S ) of the circumscribed circle whose diameter is the maximum passing diameter (D _L ) ), the ratio of the maximum distance across the diameter (D _L) and the minimum distance across the diameter (Ds) (D _L Ds) was determined.

<< 5: Measuring method of particle size distribution, average particle size and amount of granules (I) in dentifrice >>
(I) Dispersion treatment of granules in an aqueous solution for measurement: An aqueous solution in which a dentifrice was diluted to 10% by mass with ion-exchanged water was rotated at 75 rpm with a mixer (ROTARY MIXER NPC-20, manufactured by NISSIN), horizontally The granules were dispersed under conditions of directional rotation and 2 hours. Next, an aqueous solution obtained by diluting the dentifrice after dispersion was stored at room temperature (25 ° C.) for 1 day. The aqueous solution after storage was again dispersed for 10 minutes by the mixer and then applied to a laser diffraction / scattering particle size distribution apparatus.
Granules were extracted according to the same method as (i) in << 4 >>.
(Ii) Measurement of particle size distribution, average particle size and amount: The obtained powder and granule (I) were measured using a laser diffraction / scattering particle size distribution measuring device (Partica LA-950V2, manufactured by HORIBA). The measurement was performed under the conditions of refractive index: 1.58, circulation speed (scale: 5), and stirring speed (scale: 5). Ion exchange water was used as the solvent.
In the present invention, the amount of granules (a) to (e) ((a ′) to (e ′) in each particle size range (from the particle size distribution measured by a laser diffraction / scattering particle distribution measuring device ( Specifically, for each particle size range measured by laser diffraction, the content of each particle size range is multiplied by the ratio of the particle size range to give granules (a) to (e). For example, when the amount of granules having a particle size of 45 μm or more and less than 51 μm is 0.2% by volume, and the amount of granules having a particle size of 51 μm or more but less than 101 μm is 7.5% by volume by laser diffraction, the granules (a) Is 0.2 volume% × 1 / (51−45) +7.5 volume% × (100−51) / (101−51), and the calculation result is 7.4 volume%.

[Production Example 1: Production of granule A ']
A mixture of heavy calcium carbonate (produced by Calfine Co., Ltd., trade name: ACE-25, average particle size of about 3 μm) and various binding aids (C) is used as a baffle so as to obtain granules having the contents shown in Table 1. In a 75 L drum granulator (φ40 cm × L60 cm), and a drum rotation speed of 30 r. p. While mixing under the conditions of m / fluid number 0.2 / drum angle 12.6 °, sodium silicate (manufactured by Fuji Chemical Industry Co., Ltd., trade name: No. 3 sodium silicate: Na ₂ .3SiO ₂ solution, solid content 38.5 %, Diluted with 3 times the amount of water or less, 25 ° C.) using one external mixing type two-fluid nozzle (manufactured by Atmax Co., Ltd.) and granulated. The batch size is 8 kg. The addition rate of the aqueous sodium silicate solution was 3.3 mL / min.
After spraying the sodium silicate aqueous solution, mixing was continued for 1 minute, and then the mixture was discharged from the drum type granulator and dried at 80 ° C. for 90 minutes using an electric shelf drier.
Table 2 shows the particle size distribution of each of the granules A ′ to B ′ before blending, and FIG. 1 shows a graph of the particle size distribution of the granules A ′ before blending.

[Examples 1-5, Comparative Examples 1-2]
In accordance with the formulation shown in Table 3, each component was added together with the obtained pre-combination granules A ′ to B ′, and a revolutionary stirring speed of 75 rpm and agitation of rotation using a universal mixer (5XDMVV10-r, manufactured by Dalton) The mixture was stirred for 10 minutes at a speed of 200 rpm to obtain a dentifrice containing granules A to B obtained from the granules A ′ to B ′ before blending.
Subsequently, each dentifrice was used and each evaluation was performed according to the following method.
The results are shown in Table 3.
Moreover, the particle size distribution of granules A to B contained in each dentifrice is shown in Table 4, the graph of the particle size distribution of granules A contained in the dentifrice of Example 1 is shown in FIG. A photograph of (electron microscope: Hitachi S-4800) is shown in FIG. Furthermore, the graph of the particle size distribution of the granule B contained in the dentifrice of the comparative example 2 is shown in FIG.

[Evaluation of smooth feeling (smooth feeling immediately after brushing, and persistence of smooth feeling)]
1g of various dentifrices obtained in Examples 1 to 4 and Comparative Example 1 were applied, brushed with a toothbrush (Check, manufactured by Kao Corporation), and both tooth surfaces of the upper and lower front teeth were touched with a tongue, immediately after brushing Evaluation of the smooth feeling and the smooth feeling (the persistence of the smooth feeling) at the time when 1 hour had passed after the brushing were performed according to the following criteria, and point evaluation was performed in five stages. Higher values indicate better results. This was performed for seven panelists, and the average value was obtained from the obtained results.
5: It is very smooth (it feels very smooth)
4: Smooth (smooth feel)
3: Slightly slippery (feels a little smoother)
2: Feel the presence of dirt on the tooth surface 1: Feel the presence of dirt on the tooth surface

[Evaluation of dispersibility]
The dispersibility of various dentifrices in the oral cavity when brushed was evaluated according to the following criteria in five points. Higher values indicate better results. This was performed for seven panelists, and the average value was obtained from the obtained results.
5: Dispersibility is very good (a dentifrice spreads well in the mouth)
4: Dispersibility is good (a dentifrice spreads in the mouth)
3: Not quickly dispersible but not enough to feel a mass 2: Feeling dentifrice lump 1: Dentifrice is solid and difficult to spread

[Evaluation of granule feeling]
The granular feeling in the oral cavity when brushing was evaluated according to the following criteria. This was done for seven panelists, and the total number of people in each standard was used as an evaluation index. The more people who meet the “just right” criteria, the better the results. The more people who meet the “too hard” or “hard” criteria, the more foreign the body feels. .
Soft: The presence of granules is difficult to feel and the feeling of cleaning is poor. Just right: The presence of granules is moderately felt and there is a good cleaning feeling. Hard: The granules are felt hard and there is a feeling of foreign matter. Too hard: The granules are quite hard. Feeling that there is a feeling that a foreign body feel remains after brushing

  From the above results, the dentifrices of Examples 1 to 5 exhibit excellent dirt removing ability as compared with the dentifrice of Comparative Example 2, and are excellent in dispersibility in the oral cavity, and the granules gradually disappear. It turns out that it gives a good granule feeling while recognizing On the other hand, it was recognized that Comparative Example 1 was inferior in dispersibility in the oral cavity although it was excellent in a smooth feeling.

  Using the obtained granules A ′, each dentifrice containing granules A was obtained in the same manner as in Example 1 according to the formulation shown below.

Example 6 Example 7 Example 8
(I) Granule A 11.0 7 7
(II) Calcium carbonate ^{* 2} 15
(III) Sodium carboxymethylcellulose 1.0 1 1
(IV) Sodium lauryl sulfate 1.3 1.5 1.3
(V) Sorbitol (70% aqueous solution) 35 37 30
(V) Propylene glycol 4 5
Sodium pyrophosphate 0.02 1 0.02
Thickening silica 7.0 7 8
Perfume 1.0 1 1
Sodium monofluorophosphate 0.7 0.7 0.7
Benzethonium chloride 0.01 0.01 0.01
Saccharin sodium 0.12 0.13 0.12
Titanium oxide 0.2 0.1 0.2
Purified water Remainder Remainder Remainder
* 2: Same as Table 3

Example 9 Example 10
(I) Granule A 7 8
(II) Silicic anhydride A ^{* 1} 10 10
(III) Sodium carboxymethylcellulose 0.8 1.0
(III) Xanthan gum 0.05
(III) Carrageenan 0.3
(IV) Sodium lauryl sulfate 1.5 1.3
(V) Sorbitol solution (70% aqueous solution) 20 20
(V) Glycerin 5
(V) Propylene glycol 4
(V) Polyethylene glycol 600 4
Erythritol 35 10
Xylitol 10
Sodium pyrophosphate 0.1 0.1
Sodium fluoride 0.21 0.21
Triclosan 0.02
Benzethonium chloride 0.01 0.01
β-glycyrrhetinic acid 0.01 0.01
Saccharin sodium 0.05 0.05
Fragrance 1.2 1
Purified water balance remainder
* 1: Same as Table 3

Example 11
(I) Granule A 7
(II) Silicic anhydride A ^{* 1} 6
(III) Carboxymethylcellulose sodium 0.3
(III) Xanthan gum 0.05
(III) Carrageenan 0.15
(IV) Sodium N-myristoyl-L-glutamate 0.02
(IV) Sodium lauryl sulfate 1.4
(V) Glycerin 4
(V) Sorbitol solution (70% aqueous solution) 28
(V) Polyethylene glycol 5
Sodium pyrophosphate 0.01-0.02
Phytic acid 0.1-0.2
Erythritol 20
Sucralose 0.005
Thickening silica 4.5
Saccharin sodium 0.03
Titanium oxide 3
Fragrance 1
Purified water balance
* 1: Same as Table 3

Example 12
(I) Granule A 7
(II) Silicic anhydride A ^{* 1} 20
(III) Sodium carboxymethylcellulose 1.0
(III) Xanthan gum 0.2
(IV) Sodium lauryl sulfate 1.5
(V) Polyethylene glycol 5
Malic acid 1.1
Disodium monohydrogen phosphate 12 hydrate 0.5
Potassium hydroxide 0.73
Sodium hydroxide 0.11
Sodium fluoride 0.21
Polyoxyethylene sorbitan monostearate 0.3
Saccharin sodium 0.13
Titanium oxide 0.3
Fragrance 1.0
Purified water balance
* 1: Same as Table 3

X: Particle size distribution of granule A ′ before blending Y: Particle size distribution of granule A

Claims (13)

The following components (I) and (II):
(I) Water-insoluble powder material (A) and granules containing inorganic binder (B) 2 mass% to 40 mass%, and (II) heavy calcium carbonate, zeolite, and RDA value is 160 or less, And containing 3% by mass or more and 15% by mass or less of abrasive powder selected from abrasive silica having an average particle size of 1 μm or more and 15 μm or less,
In component (I), the ratio (S _A / S _S ) of the area (S _A ) of the projection surface of the granule to the area (S _S ) of the circumscribed circle whose diameter is the maximum passing diameter (D _L ) on the projection surface ) Is an average value of 0.5 or more and 0.9 or less, and the disintegration strength is 1 gf / piece or more and 20 gf / piece or less. In component (I), the average value of the ratio (D _L / D _S ) between the maximum delivery diameter (D _L ) and the minimum delivery diameter (D _S ) on the projection surface of the granule is 1.2 or more and 1.8 or less. The dentifrice composition according to claim 1, wherein The following components (I) and (II):
(I) Water-insoluble powder material (A), and granule containing inorganic binder (B) 5 mass% or more and 40 mass% or less, and (II) heavy calcium carbonate, zeolite, and RDA value is 160 or less, And containing 3% by mass or more and 15% by mass or less of abrasive powder selected from abrasive silica having an average particle size of 1 μm or more and 15 μm or less,
In component (I), the following granules (a) to (d) in the particle size distribution by laser diffraction / scattering particle size distribution measurement:
(A) Granules having a particle size of 50 μm or more and less than 100 μm (b) Granules having a particle size of 100 μm or more and less than 150 μm (c) Granules having a particle size of 150 μm or more and less than 200 μm (d) Among granules having a particle size of 200 μm or more and less than 250 μm The volume ratio (b / c) of the amount of granules (b) to the amount of granules (c) is 0.7 or more and 1.2 or less, and the volume ratio (d / c) of granules (d) to granules (c) ) Is 0.2 or more and 1 or less, the volume ratio (b / d) of the amount of granules (b) to the amount of granules (d) is greater than 1 and 5 or less, and the amount of granules (c) is 15 volumes. A dentifrice composition having a disintegration strength of 1 gf / piece or more and 20 gf / piece or less. In component (I), the total amount of granules (a) and granules (b) in the particle size distribution measured by laser diffraction / scattering particle size distribution and the following granules (e):
The dentifrice composition according to claim 3, wherein (e) the volume ratio ((a + b) / e) of the amount of granules having a particle size of 250 µm or more and less than 350 µm is greater than 1 and 20 or less.   In Component (I), the volume ratio of the total amount of granules (a) and granules (b) to the total amount of granules (c) and granules (d) in the particle size distribution measured by laser diffraction / scattering particle size distribution ( The dentifrice composition according to claim 3 or 4, wherein (a + b) / (c + d)) is 0.5 or more and 1 or less.   Furthermore, the dentifrice composition of any one of Claims 1-5 containing caking additive (III).   Furthermore, dentifrice composition of any one of Claims 1-6 containing anionic surfactant (IV).   Furthermore, the dentifrice composition of any one of Claims 1-7 containing a moistening agent (V).   The dentifrice composition according to any one of claims 1 to 8, wherein the component (I) is obtained by a rolling granulation method.   The dentifrice according to any one of claims 1 to 9, wherein the component (I) contains one or more binding aids (C) selected from calcium silicate, magnesium oxide, titanium oxide and zinc oxide. Composition.   The dentifrice composition according to claim 10, wherein in component (I), the mass ratio (C / B) of component (C) to component (B) is 0.02 or more and 1 or less. In the granule before blending to be used in addition to the dentifrice composition to obtain the component (I), the following granules (b ′) to (d ′) in the particle size distribution by laser diffraction / scattering particle size distribution measurement ):
Next granules (b ′) to (e-1 ′):
(B ′) Granules with a particle size of 100 μm or more and less than 150 μm (c ′) Granules with a particle size of 150 μm or more and less than 200 μm (d ′) Granules with a particle size of 200 μm or more and less than 250 μm (e-1 ′) Particle size of 250 μm or more Among the granules of less than 300 μm, the volume ratio (b ′ / c ′) of the amount of granules (b ′) to the amount of granules (c ′) is 0.6 or more and 1.25 or less, and the granules (d ′) The volume ratio (d ′ / c ′) of the amount of the granule (c ′) is 0.7 or more and 1.2 or less, and the volume of the amount of the granule (e-1 ′) and the amount of the granule (c ′) The ratio (e-1 '/ c') is 0.4 or more and 1.1 or less, and the disintegration strength of the granule before blending is 1 gf / piece or more and 20 gf / piece or less. The dentifrice composition of Claim 1.   The dentifrice composition according to any one of claims 1 to 12, wherein the component (I) is obtained by stirring the dentifrice composition after adding the granules at a stirring speed of 10 rpm to 250 rpm.