Abstract: Provided are an alkyl cellulose excellent in formability when added even in a small amount and not causing marked delay in disintegration; a solid preparation comprising it; and a method for producing the solid preparation. More specifically, provided are an alkyl cellulose for use in tableting, the alkyl cellulose having a specific surface area of from 0.5 to 10.0 m2/g as measured by BET method and a solid preparation comprising the alkyl cellulose. Also provided is a method for producing the alkyl cellulose, comprising the steps of: bringing pulp into contact with an alkali metal hydroxide solution to obtain alkali cellulose, reacting the alkali cellulose with an etherifying agent to obtain a first alkyl cellulose, pulverizing the first alkyl cellulose, and depolymerizing the pulverized first alkyl cellulose through hydrolysis with an acid catalyst or through oxidative decomposition with an oxidant to obtain a second alkyl cellulose.

Abstract: An injection molding composition is capable of being injection-molded easily at a temperature lower than that of a conventional composition, and an injection molded product has improved strength. More specifically, an injection molding composition containing HPMCAS has a hydroxypropoxy molar substitution of 0.40 or more. In addition, a method produces an injection molded product including a step of injecting into a mold the injection molding composition at from 50 to 250° C.

Abstract: Provided is a composition for forming a film, the composition not having completely dissolved hydroxypropyl methyl cellulose (HPMC), and enabling formation of the film having a uniform thickness by suppressing the viscosity increase of the composition around an immersion temperature of 50° C. More specifically provided is a composition for forming a film, the composition comprising hypromellose having methoxy group content of 28.0 to 30.0% by weight and hydroxypropoxy group content of 7.6 to 8.5% by weight, wherein a 2% by weight aqueous solution of the hypromellose provides a viscosity at 20° C. of 4.0 to 6.5 mPa·s, a 20% by weight dispersion of the hypromellose provides a viscosity at 50° C. of 2,000 to 11,000 mPa·s, and a 20% by weight aqueous solution of the hypromellose provides a gelation temperature of 54 to 57° C.; and a solvent.

Abstract: Provided are an alkyl cellulose excellent in formability when added even in a small amount and not causing marked delay in disintegration; a solid preparation comprising it; and a method for producing the solid preparation. More specifically, provided are an alkyl cellulose for use in tableting, the alkyl cellulose having a specific surface area of from 0.5 to 10.0 m2/g as measured by BET method and a solid preparation comprising the alkyl cellulose. Also provided is a method for producing the alkyl cellulose, comprising the steps of: bringing pulp into contact with an alkali metal hydroxide solution to obtain alkali cellulose, reacting the alkali cellulose with an etherifying agent to obtain a first alkyl cellulose, pulverizing the first alkyl cellulose, and depolymerizing the pulverized first alkyl cellulose through hydrolysis with an acid catalyst or through oxidative decomposition with an oxidant to obtain a second alkyl cellulose.

Abstract: Provided are a composition for hot-melt extrusion which can be hot-melt extruded at a temperature lower than a conventional temperature and therefore free of heat-induced deactivation of a drug; and a method for producing a hot-melt extrusion product which is simpler than a spray-drying method. More specifically, provided is a composition for hot-melt extrusion including a drug and hypromellose acetate succinate (HPMCAS) having a hydroxypropoxy molar substitution of 0.40 or more. Also provided is a method for producing a hot-melt extrusion product including a step of hot-melt extruding a composition for hot-melt extrusion including a drug and hypromellose acetate succinate having a hydroxypropoxy molar substitution of 0.40 or more at a hot-melt temperature of melting temperature of the hypromellose acetate succinate or higher, or at a hot-melt temperature equal to or higher than a temperature at which both the hypromellose acetate succinate and the drug become melted.

Abstract: There are provided HPMCAS (hypromellose acetate succinate) having such a property that a solution of the HPMCAS in a solvent has a controlled viscosity; and a method for producing the HPMCAS. More specifically, provided are HPMCAS having such property that a solution of 10 parts by weight of the HPMCAS in 100 parts by weight of a mixed solvent having a weight ratio of methylene chloride to methanol of 1:1 has a viscosity at 20° C. of 135 mPa·s or less; and a method for producing the HPMCAS including an esterification step of adding acetic anhydride and succinic anhydride to a solution of hypromellose in glacial acetic acid in the presence of sodium acetate to obtain a reaction product mixture, wherein the succinic anhydride is added intermittently, and a precipitation step of mixing the reaction product mixture with water to precipitate the HPMCAS.

Abstract: Provided are hypromellose acetate succinate (HPMCAS) which exhibits high solubility and can suppress generation of undissolved materials when dissolved in a solvent; an HPMCAS-containing composition; and a method for producing the HPMCAS. More specifically, provided are HPMCAS having a ratio of 2-position MS to 3-position MS of 1.2 or less, wherein the 2-position MS means a molar substitution of hydroxypropyl group by which a hydrogen atom of a hydroxyl group on 2-position carbon of each glucose unit of the HPMCAS has been directly replaced, and the 3-position MS means a molar substitution of hydroxypropyl group by which a hydrogen atom of a hydroxyl group on 3-position carbon of each glucose unit of the HPMCAS has been directly replaced; a composition comprising the HPMCAS and a solvent; and the method for producing the HPMCAS.

Abstract: Provided is low-substituted hydroxypropyl cellulose from which a granulation product having an adequate particle size can be obtained in a wet granulation method and a tablet having excellent compactibility and disintegrability can be obtained. More specifically, provided is low-substituted hydroxypropyl cellulose having a hydroxypropoxyl content of from 5 to 16% by weight and a water-soluble content of less than 2% by weight, wherein a weight ratio of water to the low-substituted hydroxypropyl cellulose giving a maximum torque is from 3 to 5 as determined while adding one part by weight of water per minute to one part by weight of the low-substituted hydroxypropyl cellulose under mixing with biaxial mixing blades. Also provided are a solid preparation comprising the low substituted hydroxypropyl cellulose, and the like.

Abstract: Provided are hypromellose acetate succinate (HPMCAS) which exhibits high solubility and can suppress generation of undissolved materials when dissolved in a solvent; an HPMCAS-containing composition; and a method for producing the HPMCAS. More specifically, provided are HPMCAS having a ratio of 2-position MS to 3-position MS of 1.2 or less, wherein the 2-position MS means a molar substitution of hydroxypropyl group by which a hydrogen atom of a hydroxyl group on 2-position carbon of each glucose unit of the HPMCAS has been directly replaced, and the 3-position MS means a molar substitution of hydroxypropyl group by which a hydrogen atom of a hydroxyl group on 3-position carbon of each glucose unit of the HPMCAS has been directly replaced; a composition comprising the HPMCAS and a solvent; and the method for producing the HPMCAS.

Abstract: A composition for an enteric hard capsule by taking advantage of conventionally unknown thermal gelation characteristics of a neutralized aqueous solution of an enteric polymer, so as to obtain an enteric capsule having sufficient water and acid resistances. More specifically, the composition has hypromellose acetate succinate having a molar substitution with an acetyl group per anhydroglucose unit of 0.6 to 0.8 and a ratio of the molar substitution with an acetyl group to a molar substitution with a succinyl group per anhydroglucose unit of 2.0 to 4.0, a neutralizer, and water method produces an enteric hard capsule having the steps of: immersing a core pin heated at 50 to 80° C. in the composition, taking the immersed core pin out of the composition, and drying a gel layer of the hypromellose acetate succinate formed on the taken-out core pin.

Abstract: Provided are HPMCAS powder having high solubility when dissolved in a solvent and being capable of suppressing generation of undissolved materials; and a method for producing the powder. More specifically, provided is hypromellose acetate succinate powder having an average ratio of L to D of from 2.0 to 3.0, wherein L and D mean maximum and minimum diameters of each particle, respectively. Also provided is a method for producing a hypromellose acetate succinate, comprising the steps of: dissolving hypromellose powder in a solvent, esterifying the dissolved hypromellose with succinic anhydride and acetic anhydride in the presence of a catalyst to obtain a reaction mixture, and mixing the reaction mixture with water to precipitate hypromellose acetate succinate, wherein the reaction mixture just before being mixed with the water has a viscosity of from 100 to 200 Pa·s.

Abstract: Provided are an alkyl cellulose excellent in formability when added even in a small amount and not causing marked delay in disintegration; a solid preparation comprising it; and a method for producing the solid preparation. More specifically, provided are an alkyl cellulose for use in tableting, the alkyl cellulose having a specific surface area of from 0.5 to 10.0 m2/g as measured by BET method and a solid preparation comprising the alkyl cellulose. Also provided is a method for producing the alkyl cellulose, comprising the steps of: bringing pulp into contact with an alkali metal hydroxide solution to obtain alkali cellulose, reacting the alkali cellulose with an etherifying agent to obtain a first alkyl cellulose, pulverizing the first alkyl cellulose, and depolymerizing the pulverized first alkyl cellulose through hydrolysis with an acid catalyst or through oxidative decomposition with an oxidant to obtain a second alkyl cellulose.

Abstract: Provided are a solid preparation comprising an alkyl cellulose which provides excellent moldability and disintegrability even in a small amount of the alkyl cellulose, and a production method therefor. Specifically, provided are a solid preparation having an alkyl cellulose having a specific surface area by BET method of 0.5 to 10.0 m2/g and a dissolution start temperature of 5 to 27° C.; and a method for producing a solid preparation having the steps of: mixing a cellulose pulp and a first alkali metal hydroxide solution with stirring to obtain alkali cellulose, reacting the alkali cellulose with an alkylating agent to obtain a first reaction mixture, mixing the first reaction mixture and a second alkali metal hydroxide solution with stirring and without further addition of any alkylating agent to obtain a second reaction mixture, and pulverizing an alkyl cellulose isolated from the second reaction mixture to obtain an alkyl cellulose.

Abstract: Regarding coating of fine particles or the like, provided are a coating composition containing methyl cellulose having small adhesiveness, resistance to generation of lumps, ability to form uniform coating, and ability to form a coating composition easily with water of normal temperature; a method for producing the coating composition; and a solid preparation. More specifically provided are a coating composition including methyl cellulose having such a viscosity that a viscosity at 20° C. of a 2% by weight aqueous solution of the methyl cellulose is 1 to 15 mPa·s and having such a dissolution start temperature that a dissolution start temperature of a 12% by weight aqueous liquid of the methyl cellulose is 10 to 25° C. and a solvent; a solid preparation obtained by coating of the coating composition; and the like.

Abstract: Provided are hypromellose acetate succinate (HPMCAS) which exhibits high solubility and can suppress generation of undissolved materials when dissolved in a solvent; an HPMCAS-containing composition; and a method for producing the HPMCAS. More specifically, provided are HPMCAS having a ratio of 2-position MS to 3-position MS of 1.2 or less, wherein the 2-position MS means a molar substitution of hydroxypropyl group by which a hydrogen atom of a hydroxyl group on 2-position carbon of each glucose unit of the HPMCAS has been directly replaced, and the 3-position MS means a molar substitution of hydroxypropyl group by which a hydrogen atom of a hydroxyl group on 3-position carbon of each glucose unit of the HPMCAS has been directly replaced; a composition comprising the HPMCAS and a solvent; and the method for producing the HPMCAS.

Abstract: Provided is an alkyl cellulose excellent in formability when added even in a small amount and not causing marked delay in disintegration; a solid preparation including it; and a method for producing the solid preparation. More specifically, provided is an alkyl cellulose for use in tableting, the alkyl cellulose having a specific surface area of from 0.5 to 10.0 m2/g as measured by BET method and a solid preparation including the alkyl cellulose. Also provided is a method for producing the alkyl cellulose, including the steps of: bringing pulp into contact with an alkali metal hydroxide solution to obtain alkali cellulose, reacting the alkali cellulose with an etherifying agent to obtain a first alkyl cellulose, pulverizing the first alkyl cellulose, and depolymerizing the pulverized first alkyl cellulose through hydrolysis with an acid catalyst or through oxidative decomposition with an oxidant to obtain a second alkyl cellulose.

Abstract: Provided is a composition for forming a film, the composition not having completely dissolved hydroxypropyl methyl cellulose (HPMC), and enabling formation of the film having a uniform thickness by suppressing the viscosity increase of the composition around an immersion temperature of 50° C. More specifically provided is a composition for forming a film, the composition comprising hypromellose having methoxy group content of 28.0 to 30.0% by weight and hydroxypropoxy group content of 7.6 to 8.5% by weight, wherein a 2% by weight aqueous solution of the hypromellose provides a viscosity at 20° C. of 4.0 to 6.5 mPa·s, a 20% by weight dispersion of the hypromellose provides a viscosity at 50° C. of 2,000 to 11,000 mPa·s, and a 20% by weight aqueous solution of the hypromellose provides a gelation temperature of 54 to 57° C.; and a solvent.

Abstract: There are provided a solution for spray drying having a high transmittance and markedly reduced generation of undissolved matter; and a method for producing a solid dispersion by using the solution for spray drying so that clogging with the undissolved matter is reduced and dissolution is improved. More specifically, there is provided a solution for spray drying comprising hypromellose acetate succinate (HPMCAS) having a hydroxypropoxy molar substitution of 0.40 or more, a solvent, and a drug. There is also provided a method for producing a solid dispersion comprising the step of removing the solvent from the spray drying solution.

Abstract: Provided is an alkyl cellulose excellent in formability when added even in a small amount and not causing marked delay in disintegration; a solid preparation including it; and a method for producing the solid preparation. More specifically, provided is an alkyl cellulose for use in tableting, the alkyl cellulose having a specific surface area of from 0.5 to 10.0 m2/g as measured by BET method and a solid preparation including the alkyl cellulose. Also provided is a method for producing the alkyl cellulose, including the steps of: bringing pulp into contact with an alkali metal hydroxide solution to obtain alkali cellulose, reacting the alkali cellulose with an etherifying agent to obtain a first alkyl cellulose, pulverizing the first alkyl cellulose, and depolymerizing the pulverized first alkyl cellulose through hydrolysis with an acid catalyst or through oxidative decomposition with an oxidant to obtain a second alkyl cellulose.

Abstract: Provided is a composition for hot melt extrusion including a drug and hypromellose acetate succinate (HPMCAS) having a hydroxypropoxy molar substitution of 0.40 or more and a mole ratio of an acetyl group to a succinyl group of less than 1.6. Further, provided is a method for producing a hot melt extrudate including the step of hot melt-extruding a composition for hot melt extrusion including a drug and hypromellose acetate succinate having a molar hydroxypropoxy substitution of 0.40 or more and a mole ratio of an acetyl group to a succinyl group of less than 1.6, at a hot melt temperature of not lower than a melting temperature of the hypromellose acetate succinate or of not lower than a temperature at which both the hypromellose acetate succinate and the drug are melted.