JP5690972B2 - Composition in which discoloration of titanium oxide is suppressed - Google Patents

Description

  The present invention relates to a coating composition containing titanium oxide in which discoloration by light is suppressed, a coating liquid, a coating tablet, and a titanium oxide discoloration inhibitor.

Titanium oxide (TiO ₂ ) is known to have an oxygen deficiency when irradiated with ultraviolet rays and have a blue-violet to blue-gray color. This reaction is reversible and the color is restored to its original white when placed in the dark. (Non-Patent Document 1)
Therefore, when titanium oxide is used as a pigment for skin such as cosmetics, a technique for introducing benzotriazole silicone into the composition is disclosed in order to reduce the reaction of titanium oxide to light (Patent Document 1).
On the other hand, tablet dosage forms are widely used in fields such as pharmaceuticals and health foods. Tablets are roughly classified into uncoated tablets and coated tablets. The coated tablet is obtained by coating the outer side of an inner core tablet (uncoated tablet or the like). The coating is used for the purpose of masking of odor and taste, shielding from light, improving handling properties, etc., but can also cause the tablet disintegration time to be delayed.
When titanium oxide, which is widely used as a white pigment in the fields of pharmaceuticals, health foods, etc., is also used as a component for tablet coating, if the coating layer is discolored by light, the commercial value may be reduced. Become.
In response to this problem, a titanium dioxide for coating treated with a phosphate has been disclosed (Patent Document 2).

Japanese Patent Laid-Open No. 10-7526 JP-A-11-222442

Titanium oxide Physical properties and applied technology Manabu Seino p.94-103

In order to improve the appearance of the coated tablet, when titanium oxide was included in the coating, the color of the tablet coating changed due to light. At this time, as the titanium oxide, titanium oxide treated with a phosphate for preventing discoloration due to light was used, but discoloration due to light of the coating could not be prevented. This is thought to be due to the phenomenon that the phosphate treatment of titanium oxide was removed when titanium oxide was dispersed in water at a concentration suitable for forming a thin layer coating and spray-coated on the tablets in the manufacturing process of coated tablets. It was. When the thickness of the coating layer is thin, it is highly necessary to add a colorant to the coating in order to improve the appearance. However, it has been found that there are problems as described above when titanium oxide is used.
An object of this invention is to provide the coating composition containing a titanium oxide which suppresses the change of the color tone by the light of a titanium oxide.
An object of the present invention is to provide a coating composition containing titanium oxide that suppresses discoloration of titanium oxide by light even when a coating liquid having a concentration suitable for coating having a thickness of 100 μm or less is prepared.
Another object of the present invention is to provide a coating liquid, a coated tablet, and a method for producing a coated tablet that can suppress a change in color tone of titanium oxide due to light.
Another object of the present invention is to provide a method for suppressing discoloration of titanium oxide by light and a discoloration inhibitor for titanium oxide.

When at least one selected from crystalline cellulose, crospovidone, and albumin is contained in the coating composition containing titanium oxide, the present invention can suppress the color tone change due to light of the titanium oxide contained in the tablet coating. It was made based on the knowledge of.
That is, the present invention provides the following first to seventh aspects.

First embodiment (coating composition)
That is, the first aspect of the present invention is the following coating composition containing titanium oxide, which effectively suppresses discoloration of the tablet coating due to light.
(1-1) A tablet coating composition comprising titanium oxide and at least one discoloration inhibitor selected from crystalline cellulose, crospovidone and albumin.
(1-2) The coating composition according to (1-1) for forming a film having a thickness of 100 μm or less as a tablet coating.
(1-3) The coating composition according to (1-1) or (1-2), containing 5 to 50% by mass of titanium oxide based on the composition.
(1-4) The coating composition according to any one of (1-1) to (1-3), further containing a saccharide or a sugar alcohol.
(1-5) The coating composition according to any one of (1-1) to (1-4), which contains 50 parts by mass or more of a discoloration inhibitor with respect to 100 parts by mass of titanium oxide.
(1-6) Any one of (1-1) to (1-5), which is a composition for a rapidly disintegrating tablet, preferably a composition for an orally disintegrating tablet (plain tablet) The coating composition as described.

(1-7) The coating composition according to any one of (1-1) to (1-6), which does not contain gum arabic powder and xanthan gum.
(1-8) The coating composition according to any one of (1-1) to (1-7), which does not contain hydroxypropylmethylcellulose and hydroxyethylcellulose.
(1-9) The coating composition according to any one of (1-1) to (1-8), which does not contain sucrose.
(1-10) Further, a group consisting of water-insoluble inorganic salts, silicate compounds, aluminum hydroxide, magnesium oxide and zinc oxide having an average particle size of 0.1 to 50 μm, preferably 1 to 20 μm, more preferably 5 to 10 μm. The coating composition according to any one of (1-1) to (1-9), comprising at least one water-insoluble inorganic compound and / or water-insoluble fatty acid, salt or ester thereof selected from the group consisting of:
(1-11) The material according to any one of (1-1) to (1-10), which does not contain a substance having an effect of suppressing discoloration of titanium oxide in addition to crystalline cellulose, crospovidone, and albumin. Coating composition.
(1-12) Sum of the mass of saccharides and the water-insoluble inorganic compound and / or water-insoluble fatty acid, salt or ester thereof is 25 to 55% by mass, titanium oxide is 15 to 40% by mass, and discoloration inhibitor is 10 to 10%. Coating composition in any one of (1-1)-(1-11) containing 50 mass%.

Second embodiment (coating solution)
The second aspect of the present invention is the following coating liquid that effectively suppresses discoloration of the coating due to light.
(2-1) A coating solution for forming a coating film on a tablet, wherein the coating composition is dissolved and / or dispersed in water and / or alcohol.
(2-2) The coating liquid according to (2-1), wherein water: alcohol is in the range of 1: 1 to 20: 1 (volume ratio).
(2-3) The coating liquid according to (2-1) or (2-2) above, wherein the alcohol is methanol and / or ethanol.
(2-4) The coating liquid according to (2-1) to (2-3), wherein the solid content concentration of the coating composition of the present invention in the coating liquid is 1 to 40% by mass.

Third aspect (coated tablet)
The third aspect of the present invention is the following coated tablet in which discoloration of the coating due to light is effectively suppressed.
(3-1) A coated tablet, wherein a film containing titanium oxide and at least one selected from crystalline cellulose, crospovidone and albumin is formed as a tablet coating layer.
(3-2) A coated tablet, wherein a film containing at least one selected from titanium oxide and crystalline cellulose, crospovidone and albumin is formed as a tablet coating layer with a thickness of 100 μm or less.
(3-3) The coated tablet according to (3-1) or (3-2), wherein the film does not contain gum arabic powder and xanthan gum.
(3-4) The coated tablet according to (3-1) to (3-3), wherein the film does not contain hydroxypropylmethylcellulose and hydroxyethylcellulose.
(3-5) The coated tablet according to any one of (3-1) to (3-4), wherein the tablet is a rapidly disintegrating tablet, preferably an orally disintegrating tablet (plain tablet).

(3-6) The coated tablet according to any one of (3-1) to (3-5), wherein the film further contains a saccharide or a sugar alcohol.
(3-7) The coated tablet according to any one of (3-1) to (3-6), wherein the film does not contain sucrose.
(3-8) The coating further has a water-insoluble inorganic salt, silicate compound, aluminum hydroxide, magnesium oxide and oxidation having an average particle size of 0.1 to 50 μm, preferably 1 to 20 μm, more preferably 5 to 10 μm. The coated tablet according to any one of (3-1) to (3-7), which contains at least one water-insoluble inorganic compound selected from the group consisting of zinc and / or a water-insoluble fatty acid, a salt thereof, or an ester thereof. .
(3-9) Any one of (3-1) to (3-8), wherein the film does not contain a substance having an effect of suppressing discoloration of titanium oxide in addition to crystalline cellulose, crospovidone, and albumin Coated tablet according to crab.
(3-10) The coated tablet according to any one of (3-1) to (3-9), wherein the coating contains 5 to 50% by mass of titanium oxide.

Fourth aspect (Method for producing coated tablet)
The fourth aspect of the present invention is the following method for producing a coated tablet, in which discoloration of the coating due to light is suppressed.
(4-1) A coating layer comprising a coating liquid prepared by dissolving and dispersing the coating composition of the first aspect of the present invention in water and / or alcohol on the surface of a tablet to form a coating layer. It is a manufacturing method of a tablet.
(4-2) A method for producing a coated tablet, wherein the coating liquid according to any one of (2-1) to (2-4) is applied to the surface of the tablet to form a coating layer.
(4-3) The method for producing a coated tablet according to (4-1) or (4-2), wherein the thickness of the coating layer is 100 μm or less.

Fifth embodiment (method for suppressing discoloration of titanium oxide-containing composition by light)
A fifth aspect of the present invention is a method for suppressing discoloration of a coating composition and a coated tablet by light.
(5-1)
The coating composition containing titanium oxide contains at least one selected from the group consisting of crystalline cellulose, crospovidone and albumin, and the coating composition containing titanium oxide is discolored by light. How to suppress.
(5-2)
A coating liquid in which the coating composition of the first aspect of the present invention is dissolved / dispersed in water and / or alcohol is applied to the surface of a tablet to form a coating layer. The method to suppress discoloration by the light of the coating tablet to contain.

Sixth aspect (method for suppressing discoloration of titanium oxide by light)
The sixth aspect of the present invention is a method for suppressing discoloration of titanium oxide by light.
(6-1) A method for suppressing discoloration of titanium oxide by light, including a step of coexisting at least one selected from crystalline cellulose, crospovidone, and albumin with respect to titanium oxide.
Seventh aspect (discoloration inhibitor)
(7-1) A discoloration inhibitor for a coating composition containing titanium oxide, comprising at least one selected from crystalline cellulose, crospovidone and albumin.
(7-2) The discoloration inhibitor according to (7-1), wherein the coating composition containing titanium oxide is a composition for forming a film having a thickness of 100 μm or less as a tablet coating layer.
(7-3) (7-1) or (7-2), wherein the coating composition containing titanium oxide is a composition containing 5 to 50% by mass of titanium oxide based on the coating composition. ).
(7-4) Discoloration suppression according to any one of (7-1) to (7-3), wherein the coating composition containing titanium oxide is a composition further containing a saccharide or a sugar alcohol. Agent.
(7-5) The coating composition containing titanium oxide is further water-insoluble inorganic salts having an average particle size of 0.1 to 50 μm, preferably 1 to 20 μm, more preferably 5 to 10 μm, and silicic acid. (7-1) a composition containing at least one water-insoluble inorganic compound and / or water-insoluble fatty acid, salt or ester thereof selected from the group consisting of a compound, aluminum hydroxide, magnesium oxide and zinc oxide. -Discoloration inhibitor in any one of (7-4).

(7-6) The coating composition containing titanium oxide is a composition for a rapidly disintegrating tablet, preferably a composition for an orally disintegrating tablet (plain tablet). The discoloration inhibitor according to any one of 1) to (7-5).
(7-7) The discoloration inhibitor according to any one of (7-1) to (7-6), wherein the coating composition containing titanium oxide is a composition not containing gum arabic powder and xanthan gum. .
(7-8) Discoloration suppression according to any one of (7-1) to (7-7), wherein the coating composition containing titanium oxide is a composition not containing hydroxypropylmethylcellulose and hydroxyethylcellulose. Agent.
(7-9) The discoloration inhibitor according to any one of (7-1) to (7-8), wherein the coating composition containing titanium oxide is a composition not containing sucrose.
(7-10) The coating composition containing titanium oxide is a composition not containing a substance having an effect of suppressing discoloration of titanium oxide by light in addition to crystalline cellulose, crospovidone, and albumin. 7-1)-(7-9) The discoloration inhibitor in any one of.
(7-11) As an active ingredient of the discoloration inhibitor, the total amount of crystalline cellulose, crospovidone and / or albumin is contained so as to be 50 parts by mass or more with respect to 100 parts by mass of titanium oxide. ) To (7-10).
(7-12) As an active ingredient of a discoloration inhibitor, a total amount of crystalline cellulose, crospovidone and / or albumin is contained so as to be 60 to 600 parts by mass with respect to 100 parts by mass of titanium oxide. The discoloration inhibitor according to any one of 1) to (7-11).
(7-12) The total amount of the crystalline cellulose, crospovidone and / or albumin is contained as an active ingredient of the discoloration inhibitor in an amount of 2.5 to 75% by mass with respect to the entire composition including the discoloration inhibitor. 7-1)-(7-12) The discoloration inhibitor in any one of (7-12).

(7-21) A titanium oxide discoloration inhibitor for coating tablets, comprising at least one selected from crystalline cellulose, crospovidone and albumin.
(7-22) The discoloration inhibitor according to (7-21), for forming a film having a thickness of 100 μm or less as a tablet coating layer.
(7-23) The discoloration inhibitor as described in (7-21) or (7-22) for coating rapidly disintegrating tablets, preferably for coating orally disintegrating tablets (plain tablets).
(7-31) A discoloration inhibitor for coated tablets containing titanium oxide in a coating film, comprising at least one selected from crystalline cellulose, crospovidone and albumin.
(7-32) The discoloration inhibitor according to (7-31) for a coated tablet having a coating film thickness of 100 μm.
(7-33) The discoloration inhibitor according to (7-32) or (7-33), wherein the coated tablet is a rapidly disintegrating tablet, preferably an orally disintegrating tablet (plain tablet).
(7-41) Use of at least one selected from crystalline cellulose, crospovidone and albumin in the production of a discoloration inhibitor for a coating composition containing titanium oxide.
(7-42) Use of at least one selected from crystalline cellulose, crospovidone and albumin in the manufacture of a titanium oxide discoloration inhibitor for coating tablets.
(7-43) Use of at least one selected from crystalline cellulose, crospovidone and albumin in the production of a discoloration inhibitor for coated tablets containing titanium oxide in the coating film.

ADVANTAGE OF THE INVENTION According to this invention, the coating composition containing a titanium oxide which suppresses the change of the color tone by the light of the coating of a tablet, a coating liquid, a coating tablet, the manufacturing method of a coated tablet, The discoloration of the titanium oxide by the light is suppressed. It is possible to provide a method and a titanium oxide discoloration inhibitor.
According to the present invention, when titanium oxide surface-treated for suppressing discoloration is insufficiently effective, particularly when titanium oxide is used dispersed in water and / or alcohol, the effect is easily exhibited. There is an advantage of doing.
The coating composition of the present invention can also be applied to tablets that require rapid disintegration.

A first aspect of the present invention is a tablet coating composition characterized by containing at least one selected from titanium oxide and crystalline cellulose, crospovidone and albumin as an essential component.
The coating composition has an effect of suppressing discoloration of titanium oxide due to light. Moreover, when a coated tablet is produced using the coating composition, the coating has the effect of suppressing discoloration due to light.
In the present invention, the coating refers to coating a surface of a tablet (such as an uncoated tablet) or a coating (also referred to as a coating layer or a coating film). In the present invention, a coated tablet is referred to as a coated tablet.

In the present invention, the color change due to light refers to a change in color tone when a light stability test is performed on a test object using a D65 lamp (illuminance: 5000 Lux).
In the present invention, suppression of discoloration by light means that a change in color tone when a light stability test is performed on a test object with a D65 lamp (illuminance of 5000 Lux) is observed immediately after light irradiation, and the test after light irradiation is performed. It means that the color tone of an object has not changed compared to before light irradiation. Or it says that there is no difference in the color tone of the test object after light irradiation compared with the control | contrast which is not light-irradiated.
Since it is known that the discoloration of titanium oxide by light returns to the original color when placed in a dark place, the change in color tone is observed immediately after light irradiation.
In the present invention, the light preferably includes ultraviolet rays.

The coating composition in the present invention contains titanium oxide as an essential component. Titanium oxide is titanium (IV) oxide, chemical formula is TiO2, titanium oxide, and is an inorganic compound. Also known as titanium dioxide and titania.
There are three crystal forms of titanium oxide: Anatase, Rutile, and Brookite. Of these, the anatase type and the rutile type are commonly used. In the present invention, the titanium oxide is preferably anatase type or rutile type.
Titanium oxide is a white colorant. By applying a coating containing titanium oxide to the tablet, the appearance of the coated tablet can be improved, and the storage stability of the active ingredient due to light shielding can be improved.
The coating composition in the present invention preferably contains 5% by mass or more of titanium oxide based on the coating composition, preferably 5 to 50% by mass, more preferably 5 to 45% by mass, and still more preferably. It is 10-45 mass%, Most preferably, it is 15-40 mass%.

Titanium oxide can be easily obtained from the market. For example, KA-10 (Titanium Industry), titanium oxide (Toho Titanium) and the like can be mentioned.
The titanium oxide used in the present invention may be titanium oxide surface-treated with silica, alumina, phosphate, or the like. Examples thereof include KR-380 (Titanium Industry Co., Ltd.), NA65 (Toho Titanium Co., Ltd.) and the like.

The coating composition of the first aspect of the present invention contains at least one of crystalline cellulose, crospovidone and albumin as an essential component as a substance having an effect of suppressing discoloration of titanium oxide by light.
In the examples of the present invention, crystalline cellulose, crospovidone, and albumin were confirmed to have an effect of suppressing discoloration of titanium oxide by light.
One embodiment of the present invention is a discoloration inhibitor for a coating composition containing titanium oxide containing at least one of crystalline cellulose, crospovidone, and albumin as an active ingredient (these materials are discolored in the present specification). Sometimes referred to as an inhibitor).
The coating composition of the first embodiment of the present invention is also preferably an embodiment containing a combination of a plurality of discoloration inhibitors. A preferred discoloration inhibitor combination is crystalline cellulose and crospovidone.

In the present invention, crystalline cellulose refers to α-cellulose partially depolymerized with a mineral acid and purified. In the present invention, the particle diameter of crystalline cellulose is not particularly limited, and includes fine crystalline cellulose (microcrystalline cellulose).
Crystalline cellulose can be easily obtained from the market. Examples include Theolas KG-802, Theolas PH-101 (Asahi Kasei Chemicals Corporation).

Crospovidone is a crosslinked polymer of 1-vinyl-2-pyrrolidone. Insoluble in water. Used as a disintegrant as a pharmaceutical additive.
Crospovidone is readily available from the market. For example, Kollidon CL (BASF Japan), Polyplusdon XL (ISP Japan) and the like can be mentioned.

Albumin is a general term for a group of soluble proteins contained in animal and plant cells and body fluids. Typical examples include ovalbumin contained in egg white and lactalbumin in milk. As a pharmaceutical additive, albumin obtained by desugaring chicken egg white and spray-drying can be used.
Albumin can be easily obtained from the market. For example, albumin (Wako Pure Chemical Industries) etc. are mentioned.

The discoloration inhibitor of the present invention is preferably used in an amount of 50 parts by mass or more with respect to 100 parts by mass of titanium oxide in order to express the effect. Preferably it is used in 50-800 mass parts, More preferably, it is 60-600 mass parts, More preferably, it is used at 60-400 mass parts.
Moreover, the aspect used for the discoloration inhibitor of this invention at 200 mass parts or less with respect to 100 mass parts of titanium oxide from a viewpoint of making the thickness of coating thin, More preferably, it is 150 mass parts or less. More preferably, it is 60-200 mass parts, More preferably, it is 70-150 mass parts.
The coating composition according to the first aspect of the present invention preferably contains 2.5 to 75% by mass, more preferably 10 to 60% by mass of the discoloration inhibitor of the present invention based on the coating composition. More preferably, it is 10-50 mass%, Most preferably, it is 15-45 mass%.

The coating composition according to the first embodiment of the present invention is also preferably an embodiment that is a coating composition for forming a film having a thickness of 100 μm or less as a tablet coating. As shown in Reference Examples 4-1 to 4-3, when the coating film of the tablet is thinned, when coated with the same coating composition, the disintegration time of the coated tablet decreases with decreasing coating layer thickness. There is an advantage of shortening.
Using the coating composition according to the first aspect of the present invention, a coating having a thickness of 100 μm or less, preferably 50 μm or less, more preferably 30 μm or less, and particularly preferably 20 μm or less can be formed as a tablet coating. .
In particular, the thickness is preferably 1 to 100 μm, more preferably 1 to 50 μm, still more preferably 1 to 30 μm, and particularly preferably 2 to 20 μm.
The thickness is preferably 5 μm or more, preferably 5 to 100 μm, more preferably 5 to 50 μm, still more preferably 10 to 50 μm, and particularly preferably 10 to 30 μm.
The tablet coating (film) formed using the coating composition of the present invention is preferably the outermost layer.

Here, the layer thickness of the coating can be measured by using a method and equipment usually used in the scientific and industrial fields. Although the following methods are illustrated, it is not limited to these methods.
The section of the coated tablet cut with a cutter is observed with a digital microscope or a scanning electron microscope, the thickness of the coating layer is measured at a plurality of locations, and the average value of the measured values is taken as the layer thickness. Any two or more measurement locations are preferable, more preferably any three or more locations, and an average value of measurement values at any three locations is usually sufficient.
In addition, for example, using a near-infrared / middle-infrared / far-infrared imaging system or a terahertz imaging system, the layer thickness distribution is measured non-invasively according to the measurement method of each system, and the measured values The average value of is the layer thickness. For example, MatrixNIRTM system (Spectraldimentions) as a near infrared imaging system, Spotlight 400N (PerkinElmer), Frontier FT IR / NIR / as a near infrared / middle infrared / far infrared imaging system MIR / FIR system (Perkin Elmer) and others include TAS7500 terahertz imaging system (Advantest) and TPI Image 2000 (TeraView) as terahertz imaging systems.

The coating composition according to the first aspect of the present invention desirably further includes a saccharide or a sugar alcohol. (In the present invention, saccharides or sugar alcohols are sometimes collectively referred to as “saccharides”). At this time, in order to form a thin and smooth film as a tablet coating, the coating composition according to the first aspect of the present invention further has an average particle size of 0.1 to 50 μm, preferably 1 to 20 μm. Preferably at least one water-insoluble inorganic compound and / or water-insoluble fatty acid, salt or ester thereof selected from the group consisting of 5-10 μm water-insoluble inorganic salts, silicic acid compounds, aluminum hydroxide, magnesium oxide and zinc oxide Also desirable is an embodiment containing Saccharides can well incorporate the water-insoluble inorganic compound and / or water-insoluble fatty acid, salt or ester thereof to form a thin and smooth film.
That is, the coating composition of the first aspect of the present invention contains a saccharide and the water-insoluble inorganic compound and / or water-insoluble fatty acid, salt or ester thereof, and has a thickness of 100 μm or less as a tablet coating. It is preferable as a coating composition for forming a smooth film.

Preferred saccharides include mannitol, trehalose, erythritol, maltitol, xylitol, sorbitol and the like. By using these saccharides, the tablet is easy to handle.
Further preferred saccharide is at least one selected from the group consisting of trehalose, erythritol and mannitol. Particularly preferred is trehalose and / or erythritol.
In the coating composition of the first aspect of the present invention, a plurality of types of saccharides may be used.
Trehalose is a kind of disaccharide formed by combining glucose with 1,1-glycoside, and is a white powdery crystal at normal temperature and pressure. As trehalose, any of α, α-trehalose, α, β-trehalose and β, β-trehalose may be used, but naturally occurring α, α-trehalose is preferably used. Further, a water-containing crystallized product may be used.

On the other hand, sucrose (sucrose) has a problem of caries (cavities), has high calories, and may be discolored. Therefore, it is desirable that the composition of the present invention does not contain sucrose. These sugars or sugar alcohols can be easily obtained from the market.
When the coating composition of the first aspect of the present invention contains a saccharide or sugar alcohol, the saccharide or sugar alcohol is preferably 10% by mass or more, more preferably 20% by mass or more of the entire coating composition. It is. Moreover, Preferably it is 10-70 mass%, More preferably, it is 10-60 mass%, More preferably, it is 15-50 mass%, Most preferably, it is 15-40 mass%.

As the water-insoluble inorganic compound used in the coating composition according to the first aspect of the present invention, a silicate compound is preferable. Examples of the silicate compound include talc, magnesium aluminate metasilicate, silicon dioxide, kaolin, magnesium silicate, hydrous silicon dioxide, and light anhydrous silicic acid. Talc and magnesium aluminate metasilicate are particularly desirable.
Examples of the inorganic compound other than the silicate compound include dry aluminum hydroxide gel, magnesium oxide, aluminum hydroxide, and zinc oxide. Examples of the water-insoluble inorganic salts include tricalcium phosphate, calcium hydrogen phosphate, magnesium carbonate, and calcium carbonate.
Examples of the water-insoluble fatty acid, salt or ester thereof used in the coating composition of the first aspect of the present invention include stearic acid or a salt thereof, sodium stearyl fumarate, sucrose fatty acid ester and the like. The above water-insoluble inorganic compound and / or water-insoluble fatty acid, salt or ester thereof can be easily obtained from the market. For example, as talc, high filler # 7 (Matsumura Sangyo Co., Ltd., average particle size 5 μm by laser diffraction method), high filler # 12 (Matsumura Sangyo Co., Ltd., average particle size 3 μm by laser diffraction method), high filler # 17 (Matsumura Sangyo Co., Ltd., average particle size 7.4 μm by laser diffraction method), UM talc (Luzenac Pharma, average particle size 3.6 μm by laser diffraction method), M talc (Luzenac Pharma, average particle size 4 by laser diffraction method) .7 μm) and the like. As magnesium metasilicate aluminate, Neusilin type FH1 (Fuji Chemical Industry Co., Ltd., average particle diameter 10.7 μm by laser diffraction method), Neusilin type FL1 (Fuji Chemical Industry Co., Ltd., average particle diameter 5 by laser diffraction method) 0.4 μm), Neusilin type UFL2 (Fuji Chemical Industry Co., Ltd., average particle diameter 4.3 μm by laser diffraction method) and the like. Examples of sodium stearyl fumarate include probe (JRS Pharma, average particle diameter of 22 μm by laser diffraction method), probe CG (JRS Pharma, average particle diameter of 35 μm by laser diffraction method), and the like.

Here, water insolubility is defined by the Japanese Pharmacopoeia. When the powder is passed through a No. 100 (150 μm) sieve, it is placed in a solvent and shaken vigorously every 5 minutes at 20 ± 5 ° C for 30 seconds. The degree of dissolution within 30 minutes means that it is extremely difficult to dissolve (the amount of solvent necessary for dissolving 1 g of solute is 1000 ml or more and less than 10,000 ml) and hardly dissolved (10,000 ml or more).
The average particle diameter of the water-insoluble inorganic compound and / or water-insoluble fatty acid, salt or ester thereof used in the present invention is 0.1-50 μm, preferably 1-20 μm, more preferably 5-10 μm. The average particle size is desirably 80% or less, preferably 60% or less, more preferably 40% or less, and still more preferably 20% or less of the thickness of the coating film. The average particle diameter can be easily measured by a laser diffraction method using, for example, a laser diffraction / scattering particle diameter / particle size distribution measuring apparatus (for example, Microtrac MT3100 II (Nikkiso Co., Ltd.)).

The coating composition according to the first aspect of the present invention includes, as one aspect, the water-insoluble inorganic compound and / or the water-insoluble fatty acid, a salt thereof or an ester thereof based on the coating composition of the present invention. It is preferably contained in an amount of 10% by mass, more preferably 10 to 50% by mass, further preferably 10 to 40% by mass, and particularly preferably 15 to 35% by mass.
When the coating composition of the first aspect contains a saccharide and the water-insoluble inorganic compound and / or water-insoluble fatty acid, salt or ester thereof, the saccharide and the water-insoluble inorganic compound and / or water-insoluble fatty acid, The sum of the masses of the salts or esters thereof is preferably 20 to 60% by mass, more preferably 25 to 55% by mass, based on the entire coating composition of the present invention.

In this embodiment, it is preferable to use saccharide: water-insoluble fatty acid, salt or ester thereof in the range of 1: 4 to 4: 1 (mass ratio) in the coating composition of the present invention, and 1: 3 to 3: More preferably, it is used in the range of 1 (mass ratio), and more preferably in the range of 1: 2 to 2: 1 (mass ratio).
In this case, in the coating composition according to the first aspect of the present invention, the preferred ratio of each component to the entire coating composition of the present invention is saccharides and the water-insoluble inorganic compound and / or water-insoluble fatty acid, salt or ester thereof. Is 20 to 60% by mass, titanium oxide is 5 to 50% by mass, and the discoloration inhibitor is 2.5 to 75% by mass.
More preferably, the sum of the masses of saccharides and the water-insoluble inorganic compound and / or water-insoluble fatty acid, salt or ester thereof is 25 to 55% by mass, titanium oxide is 15 to 40% by mass, and the color change inhibitor is 10 to 50. % By mass.

In addition to the above components, the coating composition of the first aspect of the present invention can contain various pharmaceutically acceptable additives as long as the effects of the present invention are not affected. Examples of such components include sugars, sugar alcohols, organic binders and / or water-soluble polymers, excipients, disintegrants, lubricants, surfactants, sweeteners, flavoring agents, flavoring agents, A fragrance | flavor, a fluidizing agent, a pH adjuster, a coloring agent, a stabilizer, a light stabilizer, a moistureproof agent, an adsorbent, etc. are mentioned.
Examples of the organic binder and / or water-soluble polymer include, for example, gum arabic powder, pullulan, hydroxypropylcellulose (HPC), hydroxypropylmethylcellulose 2208 (HPMC2208), hydroxypropylmethylcellulose 2906 (HPMC2906), and hydroxypropylmethylcellulose 2910. (HPMC2910), methylcellulose (MC), hydroxyethylcellulose (HEC), powdered cellulose, low-substituted hydroxypropylcellulose, dextrin, corn starch, pregelatinized starch, partially pregelatinized starch, hydroxypropyl starch, polyvinylpyrrolidone (PVP), carboxy Vinyl polymer, polyvinyl alcohol (PVA), crystalline cellulose, carmellose na Lithium, gelatin, xanthan gum, tragacanth, tragacanth end, macrogol 200, macrogol 300, macrogol 400, macrogol 600, macrogol 1000, macrogol 1500, macrogol 1540, macrogol 4000, macrogol 6000, macrogol 20000 And polyoxyethylene [105] polyoxypropylene [5] glycol.

An embodiment in which the coating composition of the first aspect of the present invention does not contain gum arabic powder and xanthan gum is also desirable. These substances have the property of being viscous with moisture, and coated tablets containing these substances in the coating film tend to cause a slimy feeling or disintegration delay.
An embodiment in which the coating composition of the first aspect of the present invention does not contain hydroxypropylmethylcellulose 2208 (HPMC2208), hydroxypropylmethylcellulose 2906 (HPMC2906), hydroxypropylmethylcellulose 2910 (HPMC2910), or hydroxyethylcellulose is also preferred. The coated tablet containing these substances in the coating film may adhere to the tablet when the humidity is high.
When the coating composition according to the first aspect of the present invention is used as a tablet coating that requires fast disintegration, particularly when it contains a substance that can cause disintegration delay, the rapid disintegration of the tablet can be improved. It is preferable to use a content that does not affect the content.
The content that does not affect the rapid disintegration property of the tablet is preferably 20% by mass or less, more preferably 15% by mass or less, further preferably 10% by mass or less, and particularly preferably 5% by mass of the entire coating composition. It is as follows.

Examples of excipients include precipitated calcium carbonate, calcium monohydrogen phosphate, calcium hydrogen phosphate, sodium hydrogen phosphate, dipotassium phosphate, potassium dihydrogen phosphate, calcium dihydrogen phosphate, sodium dihydrogen phosphate. , Calcium sulfate, calcium lactate, synthetic aluminum silicate, synthetic hydrosite, dry aluminum hydroxide, magnesium carbonate, magnesium oxide, carmellose, carmellose calcium, carmellose sodium, carboxymethyl ethyl cellulose, carboxy starch sodium and the like.
Examples of the disintegrant include carboxymethyl cellulose, carboxymethyl cellulose calcium, sodium carboxymethyl starch, croscarmellose sodium, low-substituted hydroxypropyl cellulose, hydroxypropyl starch and the like.
Examples of the lubricant include glyceryl monostearate, glyceryl palmitostearate, sodium stearyl fumarate, sucrose fatty acid ester, carnauba wax, L-leucine, macrogol and the like.

Examples of the surfactant include sodium lauryl sulfate, polysorbate 80, hydrogenated oil, polyoxyethylene (105) polyoxypropylene (5) glycol (PEP101), polyoxyethylene (160) polyoxypropylene (30) glycol, and the like. Can be mentioned.
Examples of the sweetener include aspartame, amateur, fructose, xylitol, glycyrrhizic acid or a salt thereof, saccharin, sucralose, stevia extract, sucrose, D-sorbitol, glucose, maltitol, D-mannitol and the like.
Examples of the flavoring agent include ascorbic acid or a salt thereof, sodium chloride, magnesium chloride, citric acid or a salt thereof, glycine, glucono-δ-lactone, L-glutamic acid or a salt thereof, succinic acid or a salt thereof, β-cyclodextrin , Tartaric acid or a salt thereof, skim milk powder, sodium bicarbonate, lactic acid or a salt thereof, fumaric acid or a salt thereof, menthol, DL-malic acid or a salt thereof, and the like.

Examples of the fluidizing agent include calcium carbonate, calcium phosphate, gypsum, magnesium carbonate, synthetic aluminum silicate, magnesium alumina hydroxide, corn starch, calcium hydrogen phosphate granule, and glyceryl monostearate.
Examples of the pH adjuster include citrate, phosphate, carbonate, tartrate, fumarate, acetate, amino acid salt and the like.
Examples of the stabilizer include sodium edetate, tocopherol, cyclodextrin and the like.
Examples of light stabilizers include water-soluble food tar dyes (food yellow No. 5, food blue No. 2 etc.), water-insoluble lake dyes (water-soluble tar dye salts), riboflavin, chlorophyll, talc, zinc oxide, sulfuric acid Examples include barium. An embodiment in which the coating composition of the present invention contains a light stabilizer is also preferable.
Examples of the desiccant include ethyl cellulose, vinyl acetate resin, purified shellac, seraphate, and white shellac.
The coating composition according to the first aspect of the present invention preferably has an aspect that does not contain a substance having an effect of suppressing discoloration of titanium oxide by light in addition to crystalline cellulose, crospovidone, and albumin.
That is, in the coating composition of the present invention, the substance having an effect of suppressing the discoloration of titanium oxide by light is an embodiment in which only one or more selected from crystalline cellulose, crospovidone and albumin is used.

The coating composition according to the first aspect of the present invention is preferably used as a coating liquid for forming a tablet coating comprising the above components dissolved and dispersed in water and / or alcohol.
At this time, in one embodiment of the present invention, the solid content concentration of the coating composition of the first embodiment of the present invention in the coating liquid of the present invention is 1 to 60% by mass, preferably 1 to 40% by mass. It is also a preferred embodiment to prepare it so as to contain it at a concentration, more preferably 2 to 30% by mass, particularly preferably 2 to 20% by mass.
If the titanium oxide surface-treated to suppress discoloration is contained in the coating liquid having a relatively low solid content as described above, the surface treatment may be removed and the effect of inhibiting discoloration may not be obtained. However, the coating composition according to the first aspect of the present invention has an advantage of exhibiting an effect of suppressing discoloration of titanium oxide even when a coating liquid having a relatively low solid content is used.

As the alcohol used in the coating liquid of the present invention, lower alcohols such as methanol, ethanol, isopropanol and the like can be used, and ethanol, particularly anhydrous ethanol is preferred. Here, ethanol means ethanol containing 95% by volume or more, and absolute ethanol means ethanol containing 99.5% by volume or more. Water: alcohol ranges from 1: 1 to 20: 1, preferably 2: 1 to 10: 1, more preferably 3: 1 to 5: 1. Furthermore, an interfacial tension adjusting agent that lowers the interfacial tension of the coating liquid, for example, a nonionic surfactant, can also be added. When an alcohol solution is used, drying after coating can be performed in a short time, which is advantageous in production.
The coating liquid of the present invention is also preferably an embodiment in which the components of the coating composition of the first aspect of the present invention are dissolved and dispersed in water.

The manufacturing method of the coated tablet of this invention is demonstrated.
The method for producing a coated tablet according to the present invention comprises a coating solution in which a coating composition containing titanium oxide and at least one selected from crystalline cellulose, crospovidone and albumin as an essential component is dissolved and dispersed in water and / or alcohol. A method for producing a coated tablet, characterized in that a coating layer is formed on the surface of the tablet.
That is, in the present invention, it is preferable to produce a coated tablet by forming the coating film by applying the coating liquid of the present invention to a tablet to a certain thickness by a conventional method, for example, spray coating.
In one embodiment of the present invention, the coating is preferably formed to have a thickness of 100 μm or less, preferably 2 to 50 μm, more preferably 5 to 20 μm.

Commercially available pan coating devices, fluidized bed coating devices, full-time rotary drum coating devices, and the like can be used, and full-year rotary drum coating devices are particularly suitable.
In the present invention, the coating liquid of the present invention is preferably applied to the surface of the tablet as a single coating layer.
In one embodiment of the present invention, one or a plurality of additional coating layers (hereinafter referred to as “layers”) are provided between the uncoated tablet and the layer formed with the coating solution and / or outside the layer formed with the coating solution. , Referred to as “additional coating layer”).
Thus, when the tablet coating is formed of a plurality of layers including a layer formed of the coating liquid of the present invention, as one aspect of the present invention, when coating a rapidly disintegrating tablet, The total thickness of the coating layer is preferably 100 μm or less, more preferably 50 μm or less.
The additional coating layer that can be provided in the present invention is not particularly limited as long as it does not impair the effects of the present invention, but when the additional coating layer contains titanium oxide, the color change inhibitor of the present invention. It is preferable to contain.

The tablet to which the coating composition of the first aspect of the present invention is applied is not particularly limited as long as it is a tablet that requires coating.
As one aspect of the present invention, the coating composition of the present invention is also preferably applied to tablets that require rapid disintegration.
Examples of tablets that require rapid disintegration include orally disintegrating tablets (plain tablets), effervescent tablets, dissolving tablets, and other tablets having a short disintegration time.
In the present invention, the tablet disintegration time is short when the disintegration test is conducted according to the disintegration test method of the 16th and 16th revision Japanese Pharmacopoeia Formulation Test Method 6.09 until the tablet is completely dissolved. Is 3 minutes or less, preferably 2 minutes or less, more preferably 60 seconds or less, even more preferably 40 seconds or less, and particularly preferably 20 seconds or less.
When the coating composition of the present invention is applied to an orally disintegrating tablet (plain tablet), the orally disintegrating tablet (plain tablet) is usually used as an orally disintegrating tablet (plain tablet) in the industry. It is not particularly limited as long as it is within the range, but is preferably an orally disintegrating tablet as defined in the 16th revised Japanese Pharmacopoeia General Formulation Description 1.1. Orally disintegrating tablets that can be rapidly dissolved or disintegrated in the oral cavity can be used. Moreover, the disintegration time measured by the method using the orally disintegrating tablet tester of Test Example 3 described later is 60 seconds or less, preferably 40 seconds or less, more preferably 20 seconds or less.

  As an orally disintegrating tablet (plain tablet), for example, it is manufactured by tableting a mixture containing a medicinal ingredient described in JP-A-5-271054, a saccharide, and a moisture that moistens the particle surface of the saccharide. Oral dissolution type tablet, comprising a low moldability saccharide and a high moldability saccharide as described in WO95 / 20380, and an oral dissolution type compression molding having rapid disintegration and solubility in the oral cavity And a drug described in WO99 / 47124, a saccharide (A) and a saccharide that can be amorphous are dissolved in a pharmaceutically acceptable solvent, and the solvent is removed from the solution and dried. An intraoral quick disintegrating tablet produced by shaping a mixture of crystalline saccharides (B) after humidification and drying, a drug described in WO2002 / 092057, a diluent, and a relative to the drug and the diluent Low melting point sugar The saccharide having a low melting point is uniformly blended in a tablet, and the drug and / or the diluent particles are produced by forming a cross-link with a melt-solidified product of the saccharide having a low melting point. Inner-speed disintegrating tablets, low-substituted hydroxypropylcellulose having a loose bulk density of 0.40 g / ml or more and a hardened bulk density of 0.60 g / ml or more as described in JP-A-2001-328948 and sugar A solid preparation containing a sugar alcohol can be used, and these orally disintegrating tablets (plain tablets) can be easily produced by the method described in the above-mentioned patent document. Moreover, the foamable disintegrating agent described in JP-A-5-50056 can also be contained.

Among these, as orally disintegrating tablets (plain tablets), in addition to the active ingredient drug, contain one or more from the group consisting of mannitol, xylitol, crystalline cellulose, crospovidone, magnesium aluminate metasilicate, and the like. Those are preferred.
The shape and size of the coated tablet formed by applying the coating composition according to the first aspect of the present invention is not particularly limited, but a circle having a diameter of about 5 to 15 mm and a thickness of about 2 to 5 mm from the viewpoint of ease of taking. A tablet, oval tablet, flower-shaped tablet and the like are preferable. Moreover, it is also possible to provide one or two secant lines so that the tablet can be divided into two or four as required.
Although the active ingredient contained in the coated tablet of the present invention is not particularly limited, the active ingredient commercially available as an orally disintegrating tablet (droxidopa, cilostazol, selegiline hydrochloride, acarbose, voglibose, glimepiride, pioglidazone, amlodipine, midodrine hydrochloride , Ebastine, olopatadine hydrochloride, cetirizine hydrochloride, fexofenadine hydrochloride, bepotastine besylate, imidafenacin, solifenacin succinate, tamsulosin hydrochloride, naphthopidyl, famotidine, lansoprazole, irsogladine maleate, precipitated calcium carbonate , Polaprezinc, rebamipide, tartyrelin hydrate, ramosetron hydrochloride, risperidone, brotizolam, galantamine hydrobromide, galantamine hydrobromide, etc.), with pharmacological activity In addition, active ingredients that are not preferably exposed to direct contact with non-healthcare or caregiver patients (norethisterone, medroxyprogesterone acetate, methyltestosterone, didrogesterone, estradiol, ethinylestradiol, levonorgestrel, pregnanediol, Hormone-like substances such as salivary gland hormones, dienagest, corticoids such as betamethasone and prednisolone, prostanoids, methyl ergometrine maleate, etc.) or active ingredients that have low light stability and require light shielding (nifedipine, benidipine, cilnidipine) And dihydropyridine antihypertensive drugs such as norfloxacin and ofloxacin, and other quinolone antibacterial drugs such as carbabapine and vitamins.
Furthermore, it is not limited to these active ingredients, The coating composition of the first aspect of the present invention can be applied to traditional Chinese medicine, OTC medicine, food for specified health use or health food.

According to a fifth aspect of the present invention, there is provided a coating composition containing titanium oxide, wherein the coating composition containing titanium oxide contains at least one selected from the group consisting of crystalline cellulose, crospovidone and albumin. This is a method of suppressing discoloration due to light.
The coating composition containing titanium oxide according to the fifth aspect of the present invention is a composition containing titanium oxide as an essential component, and is dissolved and dispersed in water and / or alcohol to produce a pharmaceutical product or quasi-drug. Used for coatings such as health foods.
The coating composition containing titanium oxide of the present invention is preferably a tablet coating composition used for tablet coating.
The coating composition containing titanium oxide will be described in more detail in the seventh embodiment.

The explanation of titanium oxide, crystalline cellulose, crospovidone and albumin used in the method of the present invention is as described in the invention of the first aspect of the present invention.
The content of the titanium oxide used in the method of the present invention and the color change inhibitor of the present invention is in accordance with the description of the coating composition of the first aspect of the present invention.
That is, it is preferable to contain 5 to 50% by mass of titanium oxide, more preferably 5 to 45% by mass, and still more preferably 10 to 45% by mass with respect to the entire composition to obtain the effect of the present invention. Especially preferably, it is preferable to make it contain 15-40 mass%.

The discoloration inhibitor of the present invention is preferably contained in an amount of 2.5 to 75% by mass, more preferably 10 to 60% by mass, and still more preferably 10 to 10% by mass, with respect to the entire composition to obtain the effects of the present invention. It is preferable to contain 50 mass%, particularly preferably 15 to 45 mass%. Here, when a plurality of discoloration inhibitors are used, the mass of the discoloration inhibitor here is the sum of the masses of the respective substances.
The preferred ratio of the content of titanium oxide used in the method of the present invention and the color change inhibitor of the present invention is in accordance with the ratio of each component of the coating composition of the first aspect of the present invention.
In the method of the present invention, the timing of adding titanium oxide and the color change inhibitor of the present invention in the composition is not particularly limited, and the timing of adding titanium oxide is before the timing of adding the color change inhibitor. Or later.
In the method of the present invention, in order to enhance the effect of suppressing discoloration, it is desirable that titanium oxide and the discoloration inhibitor are mixed in the composition.
In the method of the present invention, the composition containing the titanium oxide of the present invention is pharmaceutically acceptable as long as it does not affect the effects of the present invention in addition to titanium oxide, crystalline cellulose, crospovidone and albumin. Various additives can be included. Examples of such components include sugars, sugar alcohols, organic binders and / or water-soluble polymers, excipients, disintegrants, lubricants, surfactants, sweeteners, flavoring agents, flavoring agents, A fragrance | flavor, a fluidizing agent, a pH adjuster, a coloring agent, a stabilizer, a light stabilizer, a moistureproof agent, an adsorbent, etc. are mentioned.
The coating composition containing titanium oxide of the present invention is preferably a tablet coating composition having the constitution described in the first aspect of the present invention.

One aspect of the present invention is characterized in that a coating liquid in which the coating composition of the first aspect of the present invention is dissolved and dispersed in water and / or alcohol is applied to the surface of a tablet to form a coating layer. This is a method for suppressing discoloration of a coated tablet containing titanium oxide in a coating film due to light.
This method can be carried out in accordance with the above description of the coating composition, coating liquid and coated tablet of the first aspect of the present invention.

A sixth aspect of the present invention is a method for suppressing discoloration of titanium oxide by light, including a step of coexisting titanium oxide and at least one selected from crystalline cellulose, crospovidone, and albumin.
This method can also be carried out according to the above description of the coating composition, coating liquid and coated tablet of the first aspect of the present invention. The preferred amounts of titanium oxide, crystalline cellulose, crospovidone and albumin necessary for obtaining the effect are in accordance with the above description.

A seventh aspect of the present invention is a discoloration inhibitor for a coating composition containing titanium oxide, comprising at least one selected from crystalline cellulose, crospovidone and albumin.
Further, it is a titanium oxide discoloration inhibitor for tablet coating, characterized by containing at least one selected from crystalline cellulose, crospovidone and albumin.
The discoloration inhibitor of the seventh aspect of the present invention contains at least one selected from crystalline cellulose, crospovidone and albumin as an active ingredient.
Details of these substances are as described in the first embodiment of the present invention.

The coating composition containing titanium oxide in the seventh aspect of the present invention is a composition containing titanium oxide as an essential component, and the characteristics of the coating composition described in the first aspect apply mutatis mutandis.
The coating composition containing titanium oxide of the present invention is preferably a tablet coating composition used for tablet coating. More preferably, it is a coating composition for forming a film having a thickness of 100 μm or less as a tablet coating layer.
The titanium oxide content is 5 to 50 with respect to the entire coating composition containing titanium oxide in accordance with the titanium oxide content of the coating composition according to the first aspect of the present invention. The content is preferably 5% by mass, more preferably 5 to 45% by mass, still more preferably 10 to 45% by mass, and particularly preferably 15 to 40% by mass.

The coating composition containing titanium oxide is preferably a composition further containing a saccharide or a sugar alcohol. At this time, in order to form a thin and smooth film as a tablet coating, water-insoluble inorganic salts and silicate compounds having an average particle size of 0.1 to 50 μm, preferably 1 to 20 μm, more preferably 5 to 10 μm. An embodiment containing at least one water-insoluble inorganic compound and / or water-insoluble fatty acid, salt or ester thereof selected from the group consisting of aluminum hydroxide, magnesium oxide and zinc oxide is also desirable. That is, preferably, the coating composition containing titanium oxide is an embodiment containing a saccharide and the water-insoluble inorganic compound and / or a water-insoluble fatty acid, salt or ester thereof, and the tablet coating is 100 μm or less. It is also preferable as a coating composition for forming a film having a thickness.
The saccharide and the water-insoluble inorganic compound and / or water-insoluble fatty acid, salt or ester thereof are as described in the first aspect of the present invention, and the preferred content and content ratio in the composition are also those of the present invention. In accordance with the description of the first aspect.

The coating composition containing titanium oxide is preferably a composition for use in a rapidly disintegrating tablet, and more preferably a composition for use in an orally disintegrating tablet (uncoated tablet). The rapidly disintegrating tablet and the orally disintegrating tablet are as described above.
The coating composition containing titanium oxide is also preferably a composition that does not contain gum arabic powder and xanthan gum in order to avoid slimming and decay delay.
In order to avoid adhesion between the coated tablets when the humidity is high, the coating composition containing titanium oxide is preferably a composition containing no hydroxypropyl methylcellulose and hydroxyethyl cellulose.
Since sucrose (sucrose) has a problem of caries (cavities), is high in calories, and may be discolored, it is desirable that the coating composition containing titanium oxide does not contain sucrose.
An embodiment in which the coating composition containing titanium oxide is a composition not containing a substance having an effect of suppressing discoloration of titanium oxide due to light in addition to crystalline cellulose, crospovidone, and albumin is also preferable.
The coating composition containing titanium oxide can contain various pharmaceutically acceptable additives as long as the effects of the present invention are not affected.

The discoloration inhibitor characterized by containing at least one selected from crystalline cellulose, crospovidone, and albumin is oxidized by adding a necessary amount of an active ingredient to a coating composition containing titanium oxide. The effect which suppresses discoloration by the light of the coating composition containing titanium is exhibited.
The amount necessary for the discoloration inhibitor of the present invention to exert its effect is the content of the discoloration inhibitor in the coating composition in the description of the first aspect of the present invention, or titanium oxide and the discoloration inhibitor. According to the content ratio. That is, as an active ingredient of the discoloration inhibitor of the present invention, the total amount of crystalline cellulose, crospovidone and / or albumin is 50 parts by mass or more, preferably 50 to 800 parts by mass, more preferably 100 parts by mass of titanium oxide. It is preferable to make it contain so that it may become 60-600 mass parts, More preferably, it is 60-400 mass parts. Moreover, the aspect made to contain by 200 mass parts or less with respect to 100 mass parts of titanium oxide is also preferable, More preferably, it is 150 mass parts or less. More preferably, it is 60-200 mass parts, More preferably, it is 70-150 mass parts.
The total amount of crystalline cellulose, crospovidone and / or albumin as an active ingredient of the discoloration inhibitor of the present invention with respect to the entire composition in which the discoloration inhibitor of the present invention is contained in a coating composition containing titanium oxide. It is preferable to contain 2.5-75 mass%, More preferably, it is 10-60 mass%, More preferably, it is 10-50 mass%, Most preferably, it is 15-45 mass%.

After the discoloration inhibitor of the present invention is contained in a coating composition containing titanium oxide, a coating layer in which the above components are dissolved and dispersed in water and / or alcohol is applied to the surface of the tablet to form a coating layer. Let The discoloration inhibitor of the present invention is preferably coated so as to form a film having a thickness of 100 μm or less as a tablet coating.
In the coating liquid, the solid content concentration of the coating composition including the discoloration inhibitor is 1 to 60% by mass, preferably 1 to 40% by mass, more preferably 2 to 30% by mass, and particularly preferably 2 to 20%. It is also preferable to prepare so as to contain at a concentration by mass. The coating liquid is applied to the tablet so as to have a certain thickness by, for example, a spray coating method to form a coating film, thereby producing a coated tablet.
As a tablet coating, a coating having a thickness of 100 μm or less, more preferably 50 μm or less can be formed. In particular, the thickness is preferably 5 to 100 μm, more preferably 5 to 50 μm, still more preferably 10 to 50 μm, and particularly preferably 10 to 30 μm. These are in accordance with the method of using the coating composition of the first embodiment.

One aspect of the present invention is a discoloration inhibitor for coated tablets containing titanium oxide in a coating film, characterized by containing at least one selected from crystalline cellulose, crospovidone and albumin.
Moreover, the aspect which is a discoloration inhibitor for the coating tablet whose thickness of a coating film is 100 micrometers is also preferable.
Also preferred is an embodiment which is a discoloration inhibitor for fast disintegrating tablets, preferably oral disintegrating tablets (plain tablets) containing titanium oxide in the coating film.
The discoloration suppressing agent of the present invention can suppress discoloration of the coating containing titanium oxide by being contained in the tablet coating film.
The discoloration inhibitor of the present invention contains a necessary amount in a coating composition containing titanium oxide, and forms a coating solution in which this is dissolved and dispersed in water and / or alcohol as a coating layer of a tablet. By this, the discoloration inhibitor of this invention can be contained in the coating film of a tablet, and discoloration of the coating containing a titanium oxide can be suppressed.
The coating composition containing titanium oxide, the content of titanium oxide in this composition, and the amount necessary for the discoloration inhibitor to exert its effects are as described above.
The production of the coating liquid from the coating composition and the production of the coated tablet are also in accordance with the above description.

Next, although an example and a comparative example are shown and the present invention is explained still more concretely, the present invention is not limited to these.
<Manufacture of uncoated tablets>
(1) Uncoated tablet A
The following ingredients were weighed, mixed and tableted to obtain about 9 kg (about 90,000 tablets) of uncoated tablet A having a diameter of 6.5 mm and a thickness of 3.2 mm of about 100 mg / tablet.
D-mannitol, xylitol, crystalline cellulose, crospovidone, magnesium aluminate metasilicate (product name: Fmelt type M: Fuji Chemical) 7.200 kg
Crystalline cellulose (Theolas PH-101: Asahi Kasei Chemicals) 2.100 kg
Crospovidone (Product name Kollidon CL-F: BASF) 0.500kg
Talc (Product name High Filler # 17 Matsumura Sangyo) 0.200kg
Magnesium stearate (Product name: Magnesium stearate, plant: Ohira Chemical Industry) 0.025 kg

(2) Uncoated tablet B
The following ingredients were weighed, mixed and compressed to obtain about 9 kg (about 90,000 tablets) of about 100 mg / tablet of uncoated tablet B having a diameter of 6.5 mm and a thickness of 3.2 mm.
D-mannitol, xylitol, crystalline cellulose, crospovidone, magnesium metasilicate aluminate mixture (F melt type M: Fuji Chemical Industry) 7.200 kg
Crystalline cellulose (Theolas PH-101: Asahi Kasei Chemicals) 2.100 kg
Crospovidone (Kollidon CL-F: BASF) 0.500kg
Talc (High filler # 17 Matsumura Sangyo) 0.200kg
Sodium stearyl fumarate (PRUV: Kimura Sangyo) 0.100 kg
(3) Uncoated tablet C
The following components were weighed, mixed and tableted to obtain about 90 kg (about 900,000 tablets) of uncoated tablet C having a diameter of 6.5 mm and a thickness of 3.2 mm of about 100 mg / tablet.
Dienogest 0.900 kg, D-mannitol (Partek M100: Merck) 64.980 kg, Crystalline cellulose (Theolas PH-101: Asahi Kasei Chemicals) 18.000 kg, Crospovidone (Kollidon CL-F: BASF) 4.500 kg, Talc (High Filler # 17 Matsumura Sangyo) 1.800 kg, magnesium stearate (magnesium stearate plant: Ohira Chemical Sangyo) 0.720 kg

Reference Example 1 and Example 1
<Coating>
In either case, a coating having a thickness of 100 μm or less was applied.
Reference Example 1-1
Trehalose (product name: Trehalose G: Hayashibara Biochemical Laboratories) 4.2 g was weighed and added to 191.6 g of purified water with stirring with a propeller stirrer and dissolved. Next, 4.2 g of talc (high filler # 17, average particle size 7.4 μm: Matsumura Sangyo) was weighed and added to the above trehalose solution and uniformly dispersed to form a coating solution [trehalose 2.1 mass%, talc 2 .1% by mass]. A specified amount of this coating solution was spray-coated on the uncoated tablets B using a coating apparatus (Dria Coater 200: Powrec) under the following conditions to obtain coated tablets. 200 g of uncoated tablet B (about 2000 tablets) was coated by one coating.
Supply air temperature: 65 ℃
Air volume: 40m ³
Spray speed: 2.95mL / min
Drum rotation speed: 10rpm

Reference Example 1-2
Trehalose (product name: Trehalose G: Hayashibara Biochemical Laboratories) 4.2 g was weighed and added to 187.4 g of purified water while stirring with a propeller stirrer and dissolved. Next, 4.2 g of talc (high filler # 17, average particle size 7.4 μm: Matsumura Sangyo) and 4.2 g of titanium oxide (average particle size 0.6 μm, product name NA65: Toho Titanium) were weighed, and the above trehalose was measured. In addition to the solution, it was uniformly dispersed to obtain a coating solution [trehalose 2.1 mass%, talc 2.1 mass% and titanium oxide 2.1 mass%]. This coating solution was spray-coated on the uncoated tablets B using a coating apparatus (Dria Coater 200: Paulek) under the same conditions as in Reference Example 1-1 to obtain coated tablets. 200 g of uncoated tablet B (about 2000 tablets) was coated by one coating.
Reference Example 1-3
The trehalose of Reference Example 1-2 was replaced with 4.2 g of erythritol (product name: erythritol fine powder: Mitsubishi Food Chemical), and uncoated tablet B was coated in the same manner.

Example 1-4
81 g of trehalose (product name: trehalose G: Hayashibara Biochemical Laboratories) was weighed and added to 5922 g of purified water while stirring with a propeller stirrer to dissolve. Next, 81 g of crystalline cellulose (Theorus PH-F20JP: Asahi Kasei Chemicals), 90 g of talc (high filler # 17, average particle size 7.4 μm: Matsumura Sangyo), titanium oxide (average particle size 0.6 μm, product name NA65: Toho Titanium) ) 90 g and 36 g of crospovidone (Kollidon CL-M, average particle size 5.4 μm: BASF) were weighed, added to the above aqueous solution, and uniformly dispersed to obtain a coating solution [trehalose 1.3 mass%, crystalline cellulose 1. 3% 1.4% by mass of talc, 1.4% by mass of titanium oxide, and 0.6% by mass of crospovidone]. The coating solution was spray coated on the uncoated tablets A using a coating apparatus (Paurec coater PRC-7: Paulek) under the following conditions to obtain coated tablets. 3 kg of uncoated tablet A (about 30,000 tablets) was coated by one coating.
Supply temperature: 65 ° C
Air volume: 3.5m ³ / min
Spray speed: 20mL / min
Drum rotation speed: 12rpm
Example 1-5
Coated tablets having the composition described in Table 1 were produced according to Example 1-4.

Test Example 1 <Light Stability Test>
For the coated tablets obtained in Reference Examples 1-1 to 1-3 and Examples 1-4 to 1-5, environmental tester No. 20 (light stability test device: LT-120D3CJ: Nagano Scientific Machinery Co., Ltd.) ) Was measured under the following conditions. The coated tablets were arranged so as not to overlap in a glass petri dish and stored in an environmental tester.
<Irradiation conditions>
Use lamp: D65 lamp (illuminance 5000Lux)
Installation area: Central Temperature: Event Storage period: Up to 10 days (1.2 million Lux · h)
Table 1 shows the results of the photostability test of the coated tablets obtained in Examples 1-1 to 1-5.

Table 1

In the table, “amount of spray solution” is the actual amount of the coating solution used for spraying in the coating apparatus.
“Coating rate (%)” is the ratio of the mass of the solid component increased by coating to the mass of the solid component in the spray liquid amount.
That is, coating rate (%) = (mass of solid component increased by coating) / (mass of solid component in the amount of spray liquid) × 100 (%)

Tablets coated with a coating containing trehalose and talc (Reference Example 1-1) are white at the start of the test, and the color of the tablets remains white at the start of the test even with light irradiation of 1.2 million Lux · h. There was no change. The tablet (Reference Example 1-2) with a coating containing trehalose, talc, and titanium oxide changed the color of the tablet from white at the start to slightly pale blue by light irradiation. The same discoloration as in Example 1-2 was observed in the tablet (Reference Example 1-3) in which trehalose was replaced with erythritol.
However, tablets (Examples 1-4 and 1-5) coated with trehalose, talc, titanium oxide, crystalline cellulose, and crospovidone (Examples 1-4 and 1-5) were exposed to 1.2 million Lux · h even when irradiated with light. The color remained white at the start of the test.
Only the coating layer was discolored, and the uncoated part did not discolor.
This time, it has been found that crystalline cellulose and / or crospovidone has the effect of suppressing the discoloration of titanium oxide to light blue-white by light.
In Example 1-5, the discoloration suppressing effect of titanium oxide by light was obtained by adding 70 parts by mass of crystalline cellulose and crospovidone to 100 parts by mass of titanium oxide in the coating composition. .
In the coating liquids of Examples 1-4 and 1-5, the solid content concentrations of the compositions were as low as 6% and 9%, respectively, but discoloration of the coated tablets due to light was suppressed.

Comparative Example 2 and Example 2
<Coating>
The coating was applied so that the average thickness of the coating was 100 μm or less.
Comparative Example 2-1
Trehalose (product name: Trehalose G: Hayashibara Biochemical Laboratories) 5.0 g was weighed and added to 190.0 g of purified water while stirring with a propeller stirrer to dissolve. Next, 5.0 g of titanium oxide (average particle size 0.6 μm, product name NA65: Toho Titanium) was weighed and added to the trehalose solution, and dispersed uniformly to obtain a coating solution [2.5% by mass of trehalose, titanium oxide. 2.5% by mass]. This coating solution was spray-coated on the uncoated tablets A using a coating apparatus (Dria Coater 200: Paulek) under the same conditions as described below to obtain coated tablets. 200 g of uncoated tablet A (about 2000 tablets) was coated by one coating.
Supply air temperature: 56 ° C
Air volume: 40m3 / min
Spray speed: 1.96 mL / min
Spray pressure: 0.12 MPa
Drum rotation speed: 10rpm

Comparative Example 2-2
Trehalose (product name: Trehalose G: Hayashibara Biochemical Laboratories) 5.0 g was weighed and added to 185.0 g of purified water while stirring with a propeller stirrer to dissolve. Next, 5.0 g of titanium oxide (average particle size 0.6 μm, product name NA65: Toho Titanium) and 5.0 g of talc (product name High Filler # 17 Matsumura Sangyo) are weighed, added to the trehalose solution, and uniformly dispersed. And a coating solution [2.5% by mass of trehalose, 2.5% by mass of titanium oxide, 2.5% by mass of talc]. This coating solution was spray coated on the uncoated tablets A using a coating apparatus (Dria Coater 200: Paulek) under the same conditions as in Comparative Example 2-1, to obtain coated tablets. 200 g of uncoated tablet A (about 2000 tablets) was coated by one coating.

Example 2-3
Trehalose (product name: Trehalose G: Hayashibara Biochemical Laboratories) 4.0 g was weighed and added to 176.0 g of purified water while stirring with a propeller stirrer and dissolved. Next, 15.0 of crystalline cellulose (product name Theolas PH-F20JP: Asahi Kasei Chemicals) and 5.0 g of titanium oxide (average particle size 0.6 μm, product name NA65: Toho Titanium) are weighed and added to the above trehalose solution, and uniform. To give a coating solution [trehalose 2.0% by mass, crystalline cellulose 7.5% by mass, titanium oxide 2.5% by mass]. This coating solution was spray-coated on the uncoated tablets C using a coating apparatus (Dria Coater 200: Paulek) under the same conditions as in Comparative Example 2-1, to obtain coated tablets. 200 g of uncoated tablets C (about 2000 tablets) were coated by one coating.

Example 2-4
Trehalose (product name: Trehalose G: Hayashibara Biochemical Laboratories) 4.0 g was weighed and added to 181.0 g of purified water while stirring with a propeller stirrer and dissolved. Next, crystalline cellulose (product name Theorus PH-F20JP: Asahi Kasei Chemicals) 10.0 and titanium oxide (average particle size 0.6 μm, product name NA65: Toho Titanium) 5.0 g are weighed and added to the trehalose solution. To obtain a coating solution [trehalose 2.0% by mass, crystalline cellulose 5.0% by mass, titanium oxide 2.5% by mass]. This coating solution was spray-coated on the uncoated tablets C using a coating apparatus (Dria Coater 200: Paulek) under the same conditions as in Comparative Example 2-1, to obtain coated tablets. 200 g of uncoated tablets C (about 2000 tablets) were coated by one coating.

Example 2-5
Trehalose (product name: Trehalose G: Hayashibara Biochemical Laboratories) 4.0 g was weighed and added to 176.0 g of purified water while stirring with a propeller stirrer and dissolved. Next, crospovidone (product name Kollidon CL-M: BASF) 15.0 and titanium oxide (average particle size 0.6 μm, product name NA65: Toho Titanium) 5.0 g are weighed and added to the trehalose solution above. Dispersed and used as a coating solution [trehalose 2.0 mass%, crospovidone 7.5 mass%, titanium oxide 2.5 mass%]. This coating solution was spray-coated on the uncoated tablets C using a coating apparatus (Dria Coater 200: Paulek) under the same conditions as in Comparative Example 2-1, to obtain coated tablets. 200 g of uncoated tablets C (about 2000 tablets) were coated by one coating.

Example 2-6
Trehalose (product name: Trehalose G: Hayashibara Biochemical Laboratories) 4.0 g was weighed and added to 181.0 g of purified water while stirring with a propeller stirrer and dissolved. Next, crospovidone (product name Kollidon CL-M: BASF) 10.0 and titanium oxide (average particle size 0.6 μm, product name NA65: Toho Titanium) 5.0 g are weighed and added to the trehalose solution. Dispersed to give a coating solution [trehalose 2.0% by mass, crospovidone 5.0% by mass, titanium oxide 2.5% by mass]. This coating solution was spray-coated on the uncoated tablets C using a coating apparatus (Dria Coater 200: Paulek) under the same conditions as in Comparative Example 2-1, to obtain coated tablets. 200 g of uncoated tablets C (about 2000 tablets) were coated by one coating.

Example 2-7
Trehalose (product name: Trehalose G: Hayashibara Biochemical Laboratories) 4.0 g was weighed and added to 186.0 g of purified water while stirring with a propeller stirrer and dissolved. Next, crospovidone (product name Kollidon CL-M: BASF) 5.0 and titanium oxide (average particle size 0.6 μm, product name NA65: Toho Titanium) 5.0 g are weighed and added to the trehalose solution above. Dispersed to give a coating solution [trehalose 2.0% by mass, crospovidone 2.5% by mass, titanium oxide 2.5% by mass]. This coating solution was spray-coated on the uncoated tablets C using a coating apparatus (Dria Coater 200: Paulek) under the same conditions as in Comparative Example 2-1, to obtain coated tablets. 200 g of uncoated tablets C (about 200 tablets) were coated by one coating.
Example 2-8
The crystalline cellulose of Example 2-3 was replaced with 15.0 g of albumin (chicken egg derived: Wako Pure Chemical Industries), and uncoated tablet C was coated in the same manner.

Comparative Example 2-9
The crystalline cellulose of Example 2-3 was replaced with 15.0 g of croscarmellose sodium (product name Ac-Di-Sol: Dainippon Sumitomo Pharma Co., Ltd.), and uncoated tablet C was coated in the same manner.
Comparative Example 2-10
The crystalline cellulose of Example 2-3 was replaced with 15.0 g of β cyclodextrin (Wako Pure Chemical Industries, Ltd.), and uncoated tablet C was coated in the same manner.
Comparative Example 2-11
The plain cellulose C was similarly coated by replacing the crystalline cellulose of Example 2-3 with 15.0 g of DL-alanine (product name DL-alanine :).

Test Example 2 <Photostability Test>
About the coated tablet obtained by said 2-1 to 2-11, using a light-stability test apparatus (LT-120D3CJ: Nagano Scientific Machinery Co., Ltd.), light irradiation was performed on the following conditions, and the presence or absence of an external appearance change Was observed.
<Irradiation conditions>
Use lamp: D65 lamp (illuminance 5000Lux)
Temperature: Result Storage period: Up to 10 days (1.2 million Lux · h)
Tables 2, 3, and 4 show the evaluation results.

Table 2

Table 3

Table 4

As shown in the above table, tablets (Examples 2-3 to 2-8) with coatings containing crystalline cellulose, crospovidone, and albumin, respectively, were irradiated with 1.2 million Lux · hr. The color of the white color at the start of the test remained unchanged.
This time, it has been found that crystalline cellulose, crospovidone and albumin each have an effect of suppressing the discoloration of titanium oxide to light blue-white by light.
Even when crospovidone contained 100 parts by mass of crospovidone in the coating with respect to 100 parts by mass of titanium oxide, the effect was confirmed (Example 2-7).
On the other hand, croscarmellose sodium, β cyclodextrin, and DL-alanine did not suppress discoloration of titanium oxide by light.
Crospovidone and croscarmellose sodium are both cross-linked polymers and are considered to have a similar structure to some extent, but this test showed that crospovidone had an effect and croscarmellose sodium had no effect. It was an unexpected result. The effect of suppressing the discoloration of titanium oxide was considered to be an effect that is difficult to predict from the structure of the compound.

Example 3
<Characteristic evaluation test of coated tablet>
The characteristics of the tablets obtained in Examples 1-4 and 1-5 were evaluated by the following methods. Table 5 shows the results of the evaluation.
Test Example 3 <Disintegration time>
The uncoated tablet or coated tablet was measured under the following conditions using an orally disintegrating tablet tester (ODT-101: Toyama Sangyo). The average value of the measured values of 3 tablets was taken as the disintegration time.
Test solution: Water 37 ° C
Weight: φ20mm 10g 45rpm
Test Example 4 <Hardness>
The plain tablet or the coated tablet was measured by a conventional method using a tablet hardness meter (8M: Dr. Schleuniger Pharmatron AG). The average value of the measured values of 10 tablets was defined as hardness (Newton: N).
Test Example 5 <Slip angle>
A short side of a rectangular stainless steel plate measuring 17 cm × 28.5 cm was placed on a horizontal desk, and the short side facing each other was lifted with a jack to be inclined. Three plain tablets or coated tablets were put on the highest place on the stainless steel plate, and the angle between the stainless steel plate and the desk surface when all three tablets slipped was calculated, and this was taken as the sliding angle.

Test Example 6 <Drop test>
About 10 uncoated tablets or coated tablets, they were dropped onto a stainless steel plate from a height of 1 m, and the presence or absence of cracks was confirmed visually and using a digital microscope (VHX-600: Keyence). The degree of change is indicated by the following symbols.
A: No change, B: Very small crushing that cannot be visually confirmed, B: Crushing or chipping that can be visually confirmed, X: Cracking Test Example 7 <Appearance>
Appearance was confirmed using visual and fingertip palpation. The degree of appearance is indicated by the following symbols.
A: Glossy and very smooth, ○: Smooth, Δ: Roughly rough or slightly uneven, X: Roughly rough or uneven Test Example 8 <Layer thickness>
The cross section of the coated tablet cut with a cutter was observed with an electron microscope (S-3400N), and the thickness of the coating layer was measured. The average value of the measured values at three locations was defined as the layer thickness.

Reference Example 3-1
A coated tablet substantially the same as that obtained in Reference Example 1-1 was prepared as follows.
Trehalose (product name: Trehalose G: Hayashibara Biochemical Laboratories) 4.5 g was weighed and added to 191.0 g of purified water while stirring with a propeller stirrer to dissolve. Next, 4.5 g of talc (high filler # 17, average particle size 7.4 μm: Matsumura Sangyo) was weighed and added to the trehalose solution, and uniformly dispersed to obtain a coating solution [2.3% by mass of trehalose, talc 2 .3% by mass]. This coating solution was spray-coated on the uncoated tablets A using a coating apparatus (Dria Coater 200: Powrec) under the following conditions to obtain coated tablets. 200 g of uncoated tablet A (about 2000 tablets) was coated by one coating.
Supply air temperature: 56 ° C
Air volume: 40m ³ / min
Spray speed: 4.91 mL / min
Spray pressure: 0.12 MPa
Drum rotation speed: 10rpm
The characteristics of the tablet obtained in Reference Example 3-1 were evaluated in the same manner as described above. The evaluation is shown in Table 5 together with the properties of the coated tablets of Examples 1-4 and 1-5.

Table 5

  The thicknesses of the coating layers were all 100 μm or less, and as shown in Table 5, the disintegration times of the coated tablets were all 30 seconds or less. Coated tablets made of a coating composition containing saccharide trehalose and a water-insoluble inorganic compound and / or talc, which is one of water-insoluble fatty acids, salts or esters thereof, have a thin coating film, quick disintegration and hardness Both the contradictory properties were excellent, the appearance was excellent, and the surface was smooth.

Reference Example 4-1
A propeller stirrer is added to a solution obtained by weighing 40.0 g of trehalose (product name: trehalose G: Hayashibara Biochemical Laboratories) and mixing 97.5 g of purified water and 32.5 g of 99.5% ethanol (reagent special grade: Wako Pure Chemical Industries). The solution was added with stirring at a temperature and dissolved. Next, 20.0 g of talc (high filler # 17, average particle size 7.4 μm: Matsumura Sangyo) and 10.0 g of titanium oxide (average particle size 0.6 μm, product name NA65: Toho Titanium) were weighed, and the above trehalose was measured. In addition to the solution, it was uniformly dispersed to obtain a coating solution [trehalose 20.0% by mass, talc 10.0% by mass and titanium oxide 5.0% by mass]. A specified amount of this coating solution was spray coated on the uncoated tablet B using the coating apparatus (Dria Coater 200: Powrec) under the same conditions as in Example 1 to obtain coated tablets. 200 g of uncoated tablet B (about 2000 tablets) was coated by one coating.
Reference Example 4-2
Coating was performed according to the method of Reference Example 4-1, except that the amount of the spray solution of Reference Example 4-1 was about 2.4 times.
Reference Example 4-3
Coating was performed according to the method of Reference Example 4-1, except that the amount of the spray solution of Reference Example 4-1 was about 3.8 times.
Table 6 summarizes the property evaluation results of the coated tablets of Reference Examples 4-1 to 4-3.

Table 6

  In Reference Example 4-1, the collapse time, hardness, slip angle, drop test, and appearance were all excellent. On the other hand, in Reference Examples 4-2 and 4-3, in which the coating layer was thicker than Example 4-1, the disintegration time was delayed as the layer thickness increased, and surface irregularities tended to be conspicuous in appearance.

Claims (12)

(a) titanium oxide, (b) at least one selected from crystalline cellulose, crospovidone and albumin and (c) a saccharide or sugar alcohol , and component (a) with respect to 100 parts by mass, component (b) The composition for coating for forming a film | membrane with a thickness of 100 micrometers or less as a coating layer of a fast disintegrating tablet characterized by the above-mentioned ratio being 50 mass parts or more .   The composition for coating of Claim 1 which contains 5-50 mass% of titanium oxides on the basis of the said composition.   The coating composition according to claim 1 or 2, which does not contain gum arabic powder and xanthan gum.   The coating composition according to any one of claims 1 to 3, which is for an outermost layer.   A coating liquid for forming a coating film of a rapidly disintegrating tablet, wherein the coating composition according to any one of claims 1 to 4 is dissolved and dispersed in water and / or alcohol. . (a) titanium oxide, (b) at least one selected from crystalline cellulose, crospovidone and albumin and (c) a saccharide or sugar alcohol , and component (a) with respect to 100 parts by mass, component (b) A coating rapidly disintegrating tablet, wherein a film having a ratio of 50 parts by mass or more is formed with a thickness of 100 μm or less as a coating layer of a fast disintegrating tablet.   A method for producing a coating rapidly disintegrating tablet, comprising forming the coating liquid according to claim 5 on the surface of a fast disintegrating tablet as a coating layer having a thickness of 100 µm or less. A coating composition containing (a) titanium oxide, (b) at least one selected from crystalline cellulose, crospovidone and albumin and (c) a saccharide or a sugar alcohol is dissolved and dispersed in water and / or alcohol. A method for suppressing discoloration of a coated rapidly disintegrating tablet containing titanium oxide in a coating film by applying a coating liquid to the surface of a rapidly disintegrating tablet to form a coating layer having a thickness of 100 μm or less .   A method for suppressing discoloration of titanium oxide by light, comprising a step of coexisting at least one selected from crystalline cellulose, crospovidone and albumin with respect to titanium oxide. A discoloration inhibitor for a coating composition containing titanium oxide, comprising at least one selected from crystalline cellulose, crospovidone and albumin, wherein the crystalline cellulose is contained in 100 parts by mass of titanium oxide. The discoloration inhibitor characterized by being used by containing 50 parts by mass or more of at least one selected from crospovidone and albumin . A titanium discoloration inhibitor for coating tablets, comprising at least one selected from crystalline cellulose, crospovidone, and albumin, wherein the crystalline cellulose, the cloth are used for 100 parts by mass of titanium oxide. The discoloration inhibitor characterized by being used containing 50 parts by mass or more of at least one selected from povidone and albumin . A discoloration inhibitor for a coated tablet containing titanium oxide in a coating film, characterized by containing at least one selected from crystalline cellulose, crospovidone and albumin , wherein the crystal is formed with respect to 100 parts by mass of titanium oxide. The discoloration inhibitor characterized by being used by containing 50 parts by mass or more of at least one selected from cellulose, crospovidone and albumin .