JP2005247869A - Tooth paste - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tooth paste which is packed in a container having two chambers and from which prescribed amounts of compositions having different constitutions can simultaneously be extruded. <P>SOLUTION: This tooth paste packed in a container which has two chambers and from which two kinds of compositions in the chambers can simultaneously be extruded by pushing the main body of the container is characterized in that the ratio of the storage elastic modulus G<SB>A</SB>' of the composition (A) packed in one chamber to the storage elastic modulus G<SB>B</SB>' of the composition (B) packed in the other chamber is 0.6 to 1.4. By controlling the ratio, components which change in a coexisting state with the passage of time not to give the original objects can always be extruded in stable prescribed amounts from the mutually separated chambers. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a dentifrice that can simultaneously discharge a predetermined amount of a composition having a different composition filled in a container having two chambers.

The main component of the tooth is hydroxyapatite (Ca ₁₀ (PO ₄ ) ₆ (OH) ₂ ), and in the mouth, usually elution (decalcification) of phosphate ions and calcium ions and crystals to calcium phosphate and hydroxyapatite The calcification (remineralization) is in equilibrium. In the early stages of worm teeth, vitiligo (white spots) occur in normally transparent enamel. At this stage, if fluorine ions or calcium ions are present on the tooth surface, remineralization by fluorine ions or calcium ions is promoted, and as a result, the aforementioned vitiligo disappears and the enamel can be re-transparent. .

  However, when fluorine ions and calcium ions are blended in advance in the composition, a reaction between fluorine ions and calcium ions occurs, and the generated calcium fluoride particles become too large to be taken into the teeth, making it difficult for the teeth to be incorporated. There arises a problem that the effect of promoting remineralization cannot be obtained.

In order to solve such a problem, a two-component oral hygiene product (Patent Document 1) has been proposed in which both of these components are separated and held in separate containers and appropriately mixed at the time of use. However, the toothpaste disclosed in the above literature is packed in a tube in which the two components are stored separately, and there is an inconvenience that the two agents must be mixed in use.
Further, Patent Document 2 discloses "a toothpaste consisting of at least two components that are kept mutually separated in a dispensing container that is mutually reactive and can be dispensed from an opening that can be closed". ing. Patent Document 3 discloses a two-compartment bottle as an aspect of physical separation of a calcium ion substance and a fluorine ion substance. Patent Document 4 states that “a first dentifrice component containing tricalcium phosphate as a main active ingredient, a second dentifrice component containing a fluorine compound as a main active ingredient, and the two dentifrice components are separated. A composite dentifrice having a plurality of storage chambers and an integrated container having a single outlet for removing the two dentifrice components contained therein is disclosed. However, in each of the above-mentioned documents, there is no mention of stably supplying a predetermined amount of the composition placed in each compartment.

  On the other hand, these compositions placed in the respective compartments usually have different composition components, so the physical properties of the respective compositions differ, and the desired amount of each of the two compositions can be stably discharged each time. It was difficult. In other words, there is a phenomenon that sometimes the discharge of one composition is extremely large, and sometimes the discharge amount of one composition is small, and it is difficult to stably discharge two compositions each at a predetermined amount. It was. In particular, in the case of a two-component system comprising a composition containing granules and a composition not containing, this problem becomes more remarkable due to the difference in the physical properties of the composition due to the presence of the granules, and at the same time, the two agents are stabilized each time. It was difficult to discharge a desired amount.

The object of the present invention is to separate two types of compositions that cannot achieve their original purpose if they coexist in advance and prepare them in advance as a plurality of compositions, and mix them before use from the tube container. It is to provide a dentifrice that can dispense a fixed amount.
JP 52-61236 A JP 53-41441 A JP 58-219107 A JP 2001-247439 A

As a result of studying the viscoelastic behavior of the composition, the present inventor has found that the storage modulus G ′ _{A of} the composition (A) filled in one chamber and the composition filled in another chamber (B ) With the storage elastic modulus G ′ _B , in particular, the ratio of the storage elastic modulus (G ′ _A / G ′ _B ) when tan δ = 1, so that the two compositions can be separated into tube containers. The present inventors have found that the amount of extrusion when the chamber is filled can be controlled and completed the present invention.

That is, the present invention has two chambers and stores the composition (A) filled in one chamber into a container that simultaneously discharges two types of compositions in the two chambers by pushing the main body of the container. The ratio of the elastic modulus G ′ _A to the storage elastic modulus G ′ _{B of} the composition (B) filled in the other chamber is 0.6 to 1.4, particularly when tan δ = 1. The present invention provides a dentifrice filled with two kinds of compositions having a ratio G ′ of 0.6 / 1 to 1 / 0.6.

The dentifrice of the present invention controls the ratio between the storage elastic modulus G _A ′ of the composition (A) filled in one chamber and the storage elastic modulus G _B ′ of the composition (B) filled in the other chamber. By doing so, it is possible to stably discharge a predetermined amount each time from a container in which components that change over time and cannot achieve their original purpose when they coexist are separated and filled.

  In the present invention, the storage elastic modulus G ′ is measured using a rheometer (Paar Physica, MCR300), 25 mm Parallel Plate, plate interval 0.7 mm, frequency 0.16 Hz, measurement temperature 25 ° C., 0.1 to 1000%. This is the value (Pa) when strain is applied. The measuring method is not limited to this, and various commercially available rheometers can be used.

The initial elastic modulus G ₀ ′ is obtained by the following measurement method. That is, the composition is placed on a rheometer test stand and clamped to a predetermined thickness with a Parallel Plate. The measurement is started after the sample is allowed to stand for 15 minutes so that the stress applied to the sample during the clamping is sufficiently relaxed. The measurement starts from 0.1% strain, and the storage elastic modulus G ′ and loss elastic modulus G ″ are measured by changing the magnitude of strain in 20 steps at regular intervals on a common logarithm up to 1000% strain. . The initial elastic modulus G ₀ ′ is the value of the third step of the 20 steps, that is, the storage elastic modulus G ′ when a strain of 0.25% is applied.

The initial elastic modulus G ₀ ′, the storage elastic modulus G ′, and the storage elastic modulus G ′ when tan δ = 1 can be set to desired values by adjusting the content of the components in the composition. For example, by combining two types of silica having different oil absorption amounts and two types of sodium carboxymethyl cellulose having different etherification degrees, as shown in Table 1 below, the desired initial elastic modulus G ₀ ′ and tan δ = 1 A composition having an elastic modulus G ′ can be prepared.

  Here, tan δ is the ratio (tan δ = G ″ / G ′) between the storage elastic modulus G ′ and the loss elastic modulus G ″. The storage elastic modulus G ′ and the loss elastic modulus G ″ are: This is a parameter representing dynamic viscoelasticity. For example, see “Rheology of deliciousness”, Nobuko Nakajo, Hiroshi Ogoshi, Hatsue Moritaka (Kogaku Publishing) p. 22-26 ".

  Here, examples of the two types of silica having different oil absorption amounts used for adjusting the elastic modulus G ′ include two types of silica selected from silicas having an oil absorption amount in the range of 50 to 400 mL / 100 g. Examples of commercially available silicas having different oil absorption amounts include SORBOSIL manufactured by CROSFIELD, SYLPURE manufactured by Fuji Silysia Chemical, and the like.

Here, the oil absorption can be measured by a method according to JISK5101.
Examples of the two types of sodium carboxymethylcellulose having different degrees of etherification include two types of carboxymethylcellulose selected from carboxymethylcellulose having a degree of etherification in the range of 0.3 to 2.0. Examples of these carboxymethyl celluloses having different degrees of etherification include CMC Daicel manufactured by Daicel Chemical Industries.

By combining these components, the initial elastic modulus G ₀ ′ and the elastic modulus G ′ when tan δ = 1 are adjusted. Specifically, for example, as shown in Table 2 below, both the initial elastic modulus G ′ and the elastic modulus G ′ when tan δ = 1 are increased by increasing the blending ratio of silica having a large oil absorption. Further, by increasing the blending ratio of carboxymethyl cellulose having a low degree of etherification, the initial elastic modulus G ′ increases, and the elastic modulus G ′ when tan δ = 1 decreases.

In the present invention, the ratio G ′ _A / G ′ _B of the respective elastic moduli of the composition (A) and the composition (B), which are the contents to be placed in each chamber of the container, is 0.6 to 1.4, preferably Is 0.8 to 1.25, more preferably 0.9 to 1.11 and particularly preferably G ′ _A / G ′ _B = 1.
Furthermore, the ratio of G ′ _A and G ′ _B when tan δ = 1 is G ′ _A / G ′ _B = 0.6 / 1 to 1 / 0.6, preferably 0.8 / 1 to 1 / 0.0. It is particularly preferable that the same value is adjusted so as to be within the range of 8, more preferably within the range of 0.9 / 1 to 1 / 0.9, so as to ensure equal discharge. This is preferable. Further, the initial storage elastic modulus G ′ of the two kinds of compositions is preferably in the range of 200 to 2000 Pa, respectively.

In the two compositions of the dentifrice of the present invention, that is, in the composition (A) and the composition (B), components that change with time and cannot achieve the original purpose when they coexist are separately contained. Let For example, when the composition (A) contains a calcium ion supply compound and the composition (B) contains a fluorine ion supply compound, it does not react because it is filled in a separate chamber in the container, Since it is discharged at the same time as it is discharged and reacts in the oral cavity, fine calcium fluoride particles are generated in the vicinity of the tooth surface, and an excellent tooth remineralization promoting effect is obtained.
Examples of the calcium ion supply compound contained in the composition (A) include calcium lactate, calcium carbonate, dibasic calcium phosphate, tribasic calcium phosphate, calcium pyrophosphate, calcium sulfate and the like. In addition to the calcium ion supplying compound, the composition (A) includes powder components such as water-insoluble sodium metaphosphate, silica, aluminum hydroxide, magnesium phosphate, zeolite, composite aluminosilicate, magnesium carbonate, bengara and the like. Can be contained.
The average particle size of primary particles of these powder components is 0.1 to 10 μm, preferably 0.3 to 7 μm, and particularly preferably 0.5 to 2 μm. Here, the average particle diameter refers to a value measured by a laser diffraction / scattering particle size distribution measuring apparatus.
The calcium ion supply compound is preferably contained in the composition (A) in an amount of 50 to 16000 ppm, further 200 to 8000 ppm, particularly 800 to 8000 ppm in terms of calcium ions.
The composition (A) preferably contains granules, and the average particle size of the granules is preferably 50 to 500 μm. Here, the average particle diameter is a value measured by a laser diffraction / scattering particle size distribution measuring apparatus, and is preferably 90 to 400 μm from the viewpoint of feeling when brushing teeth.

  In these granules, water can be used as a binder, and any organic and inorganic binders can be used. Examples of such an organic binder include water-soluble polymers such as polyacrylic acid, polyvinyl alcohol, and polyethylene glycol, polysaccharides such as hydroxyethyl cellulose, carboxymethyl cellulose, hydroxypropyl cellulose, xanthan gum, and carrageenan, natural fibers, polyvinyl chloride, Examples thereof include water-insoluble polymers such as polyethylene, polypropylene, polystyrene, polymethyl methacrylate, nylon and silicone, and fats and oils such as paraffin, higher alcohol and wax. Examples of the inorganic binder include water-soluble metal salts such as sodium chloride and potassium chloride, water-soluble metal salts of organic acids such as sodium citrate, sodium tartrate and sodium succinate, colloidal silica, magnesium aluminate metasilicate, Examples of the water-insoluble compound include bentonite, montmorillonite, kaolin, synthetic aluminum silicate, calcium silicate, aluminum hydroxide gel, alumina sol, magnesium carbonate, synthetic hydrosartite, magnesium oxide, and magnesium hydroxide. These binders can be used in combination of two or more. As the binder, an inorganic water-insoluble compound is preferably used from the viewpoint of the stability of granules in the dentifrice, and colloidal silica or synthetic aluminum silicate is particularly preferably used.

  Granules have a plaque removal performance, a disintegration strength that allows them to disintegrate with a load of 0.1 to 50 g, preferably 3 to 15 g per granule, in that they are not perceived as foreign substances in the oral cavity and disintegrate moderately by brushing. What has is preferable.

  Such granules are produced by spray granulation, spray cooling, extrusion, press, cutting, granulation and the like.

In the whole dentifrice of the present invention, the granule is contained in an amount of 1 to 50% by mass, preferably 3 to 40% by mass, particularly 5 to 30% by mass.
The fluorine ion supply compound contained in the composition (B) may be either an inorganic compound or an organic compound. Specifically, for example, sodium fluoride, potassium fluoride, tin fluoride, sodium fluorosilicate, sodium monofluorophosphate, aluminum fluoride, silver fluoride, hexylamine hydrofluoride, decahydrofluoric acid Examples include nolamine and octadecenylamine hydrofluoride. Of these, sodium monofluorophosphate and sodium fluoride are particularly preferably used. The content of the fluorine ion supply compound in the total amount of the dentifrice of the present invention is preferably 0.002 to 1% by mass, particularly 0.01 to 0.2% by mass in terms of fluorine.
In the compositions (A) and (B) of the dentifrice of the present invention, in addition to the above-mentioned components, wetting agents such as glycerin and polyethylene glycol, foaming agents, binders such as sodium carboxymethylcellulose, carrageenan and silica. Sweeteners such as sodium saccharin, colorants, preservatives such as methyl paraoxybenzoate, bactericides such as benzethonium chloride, isopropylmethylphenol, and triclosan, anti-inflammatory agents, and fragrances can be added.

  The dentifrice of the present invention adjusts the above-mentioned components and the content thereof, and presses the composition (A) and the composition (B) with the ratio of the storage elastic modulus G ′ within the expected range by pressing pressure. Manufactured by filling each compartment contained in a container capable of discharging contents.

  Various types of containers can be used to push out the contents by pressing the container body filled with the contents, but one end of a tube laminated with a metal thin film, plastic thin film, etc. is sealed and the other end is sealed. Disposing a discharge port that can discharge a plurality of contents at the same time, and using a plurality of compartments that extend from one end to the other end connected to the discharge port, no matter where you press It is preferable because the same pressure can be applied to the other compartment.

  Examples of the compartment include those in which a partition is provided inside the container so that they are not mixed with each other, a bag-like one, a small container inserted into the container, a separate container joined at the mouth, etc. In either case, one end is connected to the discharge port of the container. Further, it is preferable that the ratio of the sectional area and the volume ratio of each compartment are substantially the same, specifically, in the range of 0.9 / 1 to 1 / 0.9.

  The cross section of the container incorporating the compartment is illustrated in FIG. A container provided with a compartment (FIG. 1 (1)), a concentric cylindrical compartment (FIG. 1 (2)), and a cylindrical compartment that is eccentric. One provided (FIG. 1 (3)) and one provided with one semi-cylindrical compartment (FIG. 1 (4)) and two (FIG. 1 (5)) are mentioned.

Examples 1 and 2
The doughs of the respective compositions of Group A and Group B shown in Tables 1 and 2 were prepared, and 60 g each was sealed in a toothpaste container having a compartment volume of 60 mL having the cross section of (5) in FIG.

Dischargeability test:
A tube compressor in which two rubber rolls having a diameter of 5 cm were arranged with a clearance of 0.5 mm was inserted lightly into the bottom (seal part) of the container and the roll was rotated to apply force to the tube. The squeezed dentifrice was squeezed out so that the length was 1 cm, the masses of the composition A and the composition B were measured, and the mass ratio of the composition B (W _B ) to the composition A (W _A ) was calculated. .

(Equation 1)
Ejection determination: A; 1 / 1.1 ≦ W _B / W _A ≦ 1.1
X: W _B / W _A <0.6 or 1 / 0.6 <W _B / W _A

As shown in Table 3, in Examples 1 and 2, the ratios of the storage elastic moduli G _A ′ and G _B ′ when tan δ = 1 are 0.95 and 1.02, respectively, and the discharge properties are good. The composition of each example has a predetermined amount of composition stably controlled by controlling the ratio between the storage elastic moduli G _A ′ and G _B ′ within the range of 0.6 / 1 to 1 / 0.6. It was possible to discharge objects.

On the other hand, in Comparative Examples 1 and 2, the ratios of the storage elastic moduli G _A ′ and G _B ′ when tan δ = 1 are 0.53 and 0.55, respectively, and the discharge properties are poor. Each of the two-pack type toothpastes marketed in the United States was also subjected to a discharge test. The results are as shown in Table 3. That is, the ratio between the storage elastic moduli G _A ′ and G _B ′ when tan δ = 1 is 0.46, and the discharge performance is poor. Since the difference in G ′ of the two agents is greatly different between the comparative example and the commercially available composition, the discharge of one side is extremely large or small, and a predetermined amount cannot be stably discharged each time. ing.

Examples 3 and 4
Each composition of A and B shown in Table 4 was prepared, and 60 g was sealed in each toothpaste container having a compartment volume of 60 mL having the cross section of (5) in FIG.

The dischargeability was evaluated in the same manner as in Examples 1 and 2. As a result, as shown in Table 4, although the compositions (B) of Example 3, Example 4, Comparative Example 3, and Comparative Example 4 all had a viscosity of 3000 dPa · S (25 ° C.), the test was carried out. Since G _A ′ / G _B ′ of Examples 3 and 4 are 0.91 and 0.73, respectively, good dischargeability is shown. On the other hand, since G _A ′ / G _B ′ of Comparative Examples 1 and 2 are 1.45 and 1.8, respectively, poor ejection properties are shown. That is, even if the viscosity value of the composition is controlled, it is not always possible to stably discharge a predetermined amount of the composition each time, but the ratio between the storage elastic moduli G _A ′ and G _B ′ is set to 0. By controlling the pressure within the range of 6 to 1.4, it was possible to stably discharge a predetermined amount of the composition each time.
Further, the dentifrices of Examples 3 to 4 had no change in the discharge properties and no change in the components even when discharged after 25 months at 25 ° C.

It is a figure which shows the cross-sectional view (5 types) of a dentifrice container.

Claims (5)

A dentifrice filled in a container that has two chambers and simultaneously discharges two types of compositions in the two chambers by pushing the container body,
The ratio of the storage elastic modulus G _A ′ of the composition (A) filled in one chamber to the storage elastic modulus G _B ′ of the composition (B) filled in the other chamber is 0.6 to 1.4 A dentifrice. The dentifrice according to claim 1, wherein the ratio of G _A 'to G _B ' is a ratio when tan δ = 1.   The dentifrice of Claim 1 which contains at least one of sodium carboxymethylcellulose or a silica in at least 1 type of composition.   The composition (A) is a composition containing a calcium ion supply compound, and the composition (B) is a composition containing a fluorine ion supply compound. The dentifrice as described.   The dentifrice according to claim 4, wherein the composition (A) is a composition containing granules.

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