Provided is a carboxymethyl cellulose or a salt thereof, in which when the carboxymethyl cellulose or the salt thereof is used as a binding agent for an electrode of a nonaqueous electrolyte secondary battery, defects, such as pinholes, on a surface of the electrode are reduced and a battery including the electrode has a good capacity retention. A method for producing a carboxymethyl cellulose or a salt thereof includes an alkali cellulose formation step (step 1) of allowing cellulose and an alkali to react with each other in the presence of a mixed solvent containing water and an organic solvent, an etherification step (step 2) of allowing the resulting alkali cellulose and an etherifying agent to react with each other, a purification step (step 3) of washing and drying the resulting reaction mixture, and a pulverization step (step 4) of pulverizing the resulting purified product. In the method, the step 1 is conducted for a reaction time of 60 minutes or more and 120 minutes or less under conditions of a pH of 9 or more and a reaction temperature of 5 C. or higher and 25 C. or lower.

Provided is a carboxymethyl cellulose or a salt thereof, in which when the carboxymethyl cellulose or the salt thereof is used as a binding agent for an electrode of a nonaqueous electrolyte secondary battery, defects, such as pinholes, on a surface of the electrode are reduced and a battery including the electrode has a good capacity retention. A method for producing a carboxymethyl cellulose or a salt thereof includes an alkali cellulose formation step (step 1) of allowing cellulose and an alkali to react with each other in the presence of a mixed solvent containing water and an organic solvent, an etherification step (step 2) of allowing the resulting alkali cellulose and an etherifying agent to react with each other, a purification step (step 3) of washing and drying the resulting reaction mixture, and a pulverization step (step 4) of pulverizing the resulting purified product. In the method, the step 1 is conducted for a reaction time of 60 minutes or more and 120 minutes or less under conditions of a pH of 9 or more and a reaction temperature of 5 C. or higher and 25 C. or lower.

Provided is a carboxymethyl cellulose or a salt thereof, in which when the carboxymethyl cellulose or the salt thereof is used as a binding agent for an electrode of a nonaqueous electrolyte secondary battery, defects, such as pinholes, on a surface of the electrode are reduced and a battery including the electrode has a good capacity retention. A method for producing a carboxymethyl cellulose or a salt thereof includes an alkali cellulose formation step (step 1) of allowing cellulose and an alkali to react with each other in the presence of a mixed solvent containing water and an organic solvent, an etherification step (step 2) of allowing the resulting alkali cellulose and an etherifying agent to react with each other, a purification step (step 3) of washing and drying the resulting reaction mixture, and a pulverization step (step 4) of pulverizing the resulting purified product. In the method, the step 1 is conducted for a reaction time of 60 minutes or more and 120 minutes or less under conditions of a pH of 9 or more and a reaction temperature of 5 C. or higher and 25 C. or lower.

The invention relates to a method for dissolving the components of gel forming materials suitable for use in wound care comprising the steps of admixing said components with an ionic liquid. The ionic liquid may be selected from the group of tertiary amine N-oxides, N,N-dimethyl formamide/nitrogen tetroxide mixtures, dimethyl sulphoxide/paraformaldehyde mixtures and solutions of limium chloride in N,N-dimethyl acetamide or N-methyl pyrrolidone.

The invention relates to a method for dissolving the components of gel forming materials suitable for use in wound care comprising the steps of admixing said components with an ionic liquid. The ionic liquid may be selected from the group of tertiary amine N-oxides, N,N-dimethyl formamide/nitrogen tetroxide mixtures, dimethyl sulphoxide/paraformaldehyde mixtures and solutions of limium chloride in N,N-dimethyl acetamide or N-methyl pyrrolidone.

A process for recovering an esterified cellulose ether from a reaction product mixture obtained from a reaction of (a) a cellulose ether with (b) an aliphatic monocarboxylic acid anhydride or a di- or tricarboxylic acid anhydride or a combination of an aliphatic monocarboxylic acid anhydride and a di- or tricarboxylic acid anhydride, comprises the steps of (i) contacting the reaction product mixture with an aqueous liquid to precipitate the esterified cellulose ether from the reaction product mixture, (ii) isolating the precipitated esterified cellulose ether from the mixture obtained in step (i), and (iii) suspending the isolated esterified cellulose ether in an aqueous liquid to provide a suspension having a temperature of at least 28 C., and (iv) recovering the esterified cellulose ether from the suspension of step (iii).

A process for recovering an esterified cellulose ether from a reaction product mixture obtained from a reaction of (a) a cellulose ether with (b) an aliphatic monocarboxylic acid anhydride or a di- or tricarboxylic acid anhydride or a combination of an aliphatic monocarboxylic acid anhydride and a di- or tricarboxylic acid anhydride, comprises the steps of (i) contacting the reaction product mixture with an aqueous liquid to precipitate the esterified cellulose ether from the reaction product mixture, (ii) isolating the precipitated esterified cellulose ether from the mixture obtained in step (i), and (iii) suspending the isolated esterified cellulose ether in an aqueous liquid to provide a suspension having a temperature of at least 28 C., and (iv) recovering the esterified cellulose ether from the suspension of step (iii).

Provided is a method for producing cellulose ether having a reduced degree of yellowness, a low content of ash, and a high bulk density, and the method involves a reduced consumption of water or energy compared to conventional methods. The method for producing cellulose ether essentially includes the steps of: allowing alkali cellulose and an etherifying agent to react with each other to produce a reaction product; washing the reaction product and removing liquid from the product to produce a first hydrous cellulose ether; cooling the first hydrous cellulose ether; heating the cooled first hydrous cellulose ether to 60 to 110 C.; using a screw press to remove liquid from the heated first hydrous cellulose ether to obtain a second hydrous cellulose ether in a form of solid immediately after being discharged from the screw press; and drying and pulverizing the second hydrous cellulose ether.

Provided is a method for producing cellulose ether having a reduced degree of yellowness, a low content of ash, and a high bulk density, and the method involves a reduced consumption of water or energy compared to conventional methods. The method for producing cellulose ether essentially includes the steps of: allowing alkali cellulose and an etherifying agent to react with each other to produce a reaction product; washing the reaction product and removing liquid from the product to produce a first hydrous cellulose ether; cooling the first hydrous cellulose ether; heating the cooled first hydrous cellulose ether to 60 to 110 C.; using a screw press to remove liquid from the heated first hydrous cellulose ether to obtain a second hydrous cellulose ether in a form of solid immediately after being discharged from the screw press; and drying and pulverizing the second hydrous cellulose ether.