Abstract: [Problems] A composition capable of forming a film having both good solubility and good strength, and the film are provided. [Solution] The composition includes first hydroxypropyl methyl cellulose (HPMC) polymer having a viscosity of 2.5-4.5 mPa·s, second HPMC polymer having 6.0-50.0 mPa·s, third HPMC polymer having 4.5-15.0 mPa·s, a gelling agent, and a solvent, each viscosity determined at 20° C. in a 2 mass % aqueous solution, wherein the first HPMC polymer is selected from three members: HPMC-IA in Group I and HPMC-IIA and HPMC-IIB in Group II, the second HPMC polymer is the same member as that of the first HPMC polymer, provided that DS (MS) of the second HPMC polymer may be the same as or different from the DS (MS) of the first HPMC polymer, and the third HPMC polymer is selected from a member or members in a Group different from the Group of the first HPMC polymer.

Abstract: Provided is a method capable of productively producing, even after reducing the amount of an aliphatic carboxylic acid used, hydroxypropyl methylcellulose acetate succinate (HPMCAS) with an equivalent level of molecular weight as compared to before reducing the amount of the aliphatic carboxylic acid. The production method includes at least an esterification reaction step of obtaining a hydroxypropyl methylcellulose acetate succinate-containing reaction solution by subjecting hydroxypropyl methylcellulose, an acetylating agent and a succinoylating agent to an esterification reaction under the presence of an aliphatic carboxylic acid and a polyalcohol.

Abstract: There is provided a film-forming composition, including: a first water-soluble cellulose ether (WSCE) having a viscosity at 20° C. of 2.5 to 45 mPa·s, a second WSCE having a viscosity at 20° C. of 6.0 to 50.0 mPa·s, a third WSCE having a viscosity at 20° C. of 4.5 to 15.0 mPa·s, each viscosity being determined in a 2% by mass aqueous solution, and a solvent, wherein the first WSCE is selected from four members of hydroxypropyl methyl celluloses Ia and Ib in Group I and hydroxypropyl methyl cellulose IIa and methyl cellulose IIb in Group II, the second WSCE is the same member as that of the first WSCE, provided that the substitution degree(s) of the second WSCE may be the same as or different from that of the first WSCE, and the third WSCE is selected from members in a Group different from the Group of the first WSCE.

Abstract: A method for producing a cellulose ether having a high viscosity while keeping the same degree of polymerization as that in the production of a shaped pulp without changing a raw material or production facility. More specifically, provided is a method for producing a cellulose ether including steps of: cutting or pulverizing pulp to obtain sheet-like, chip-like, or powdery cellulose pulp, wherein the pulp is formed in a form of roll whose surface layer on at least one of the circumferential side and the ends is removed, or in a form of bale whose surface layer on at least one side is removed; bringing the obtained cellulose pulp into contact with an alkali metal hydroxide solution to obtain alkali cellulose; reacting the alkali cellulose with an alkylating agent to obtain a reaction product mixture; and subjecting the reaction product mixture to purification to obtain the cellulose ether.

Abstract: There is provided a film-forming composition, including: a first water-soluble cellulose ether (WSCE) having a viscosity at 20° C. of 2.5 to 45 mPa·s, a second WSCE having a viscosity at 20° C. of 6.0 to 50.0 mPa·s, a third WSCE having a viscosity at 20° C. of 4.5 to 15.0 mPa·s, each viscosity being determined in a 2% by mass aqueous solution, and a solvent, wherein the first WSCE is selected from four members of hydroxypropyl methyl celluloses Ia and Ib in Group I and hydroxypropyl methyl cellulose IIa and methyl cellulose IIb in Group II, the second WSCE is the same member as that of the first WSCE, provided that the substitution degree(s) of the second WSCE may be the same as or different from that of the first WSCE, and the third WSCE is selected from members in a Group different from the Group of the first WSCE.

Abstract: There is provided a method for producing a low polymerization degree cellulose ether having a less yellowish appearance and having excellent long-term storage stability through depolymerization of a high polymerization degree cellulose ether with an acid and without requiring an additive other than the acid. More specifically, there is provided a method for producing a low polymerization degree cellulose ether, including a step of depolymerizing a high polymerization degree cellulose ether with an acid to obtain a low polymerization degree cellulose ether mixture and a step of neutralizing the acid present in the low polymerization degree cellulose ether mixture, wherein ultraviolet is applied in the step of depolymerizing or between the steps of depolymerizing and neutralizing.

Abstract: A method for producing a cellulose ether having a high viscosity while keeping the same degree of polymerization as that in the production of a shaped pulp without changing a raw material or production facility. More specifically, provided is a method for producing a cellulose ether including steps of: cutting or pulverizing pulp to obtain sheet-like, chip-like, or powdery cellulose pulp, wherein the pulp is formed in a form of roll whose surface layer on at least one of the circumferential side and the ends is removed, or in a form of bale whose surface layer on at least one side is removed; bringing the obtained cellulose pulp into contact with an alkali metal hydroxide solution to obtain alkali cellulose; reacting the alkali cellulose with an alkylating agent to obtain a reaction product mixture; and subjecting the reaction product mixture to purification to obtain the cellulose ether.

Abstract: There is provided a method for producing a low polymerization degree cellulose ether having a less yellowish appearance and having excellent long-term storage stability through depolymerization of a high polymerization degree cellulose ether with an acid and without requiring an additive other than the acid. More specifically, there is provided a method for producing a low polymerization degree cellulose ether, including a step of depolymerizing a high polymerization degree cellulose ether with an acid to obtain a low polymerization degree cellulose ether mixture and a step of neutralizing the acid present in the low polymerization degree cellulose ether mixture, wherein ultraviolet is applied in the step of depolymerizing or between the steps of depolymerizing and neutralizing.