Method for producing cationized cellulose and method for producing cationized hydroxyalkyl cellulose

A method of producing a cationized cellulose, the method comprising:

• first, adding a basic compound to a cellulose in an amount of 0.01 to 1 equiv per one mole of anhydroglucose unit of the cellulose and mechanically decrystallizing the cellulose with a tank-drive media mill such that a reduction (P3) in crystallinity from said first adding is represented by calculation formula (3):
• P3=crystallinity (%) of cellulose before starting said first adding−crystallinity (%) of cellulose after completing said first adding (3)
• reaches 1 to 60%, thereby obtaining a mixture, and
• second, adding a cationizing agent represented by formula (1):
• wherein each of R1 to R3 is independently a hydrocarbon group having 1 to 3 carbon atoms and X− is an anionic atom or group,
• to the mixture obtained from said first adding and mechanically decrystallizing the cellulose with a tank-drive media mill such that a reduction (P4) in crystallinity from said second adding represented by calculation formula (4):
• P4=crystallinity (%) of cellulose before starting said second adding−crystallinity (%) of cationized cellulose after completing said second adding (4)
• reaches 1 to 80%,
• wherein the cellulose is allowed to react with a cationizing agent represented by formula (1) during said second adding.

A method of producing a cationized hydroxyalkylcellulose, the method comprising:

• first, adding a cationizing agent represented by formula (1):
• wherein each of R1 to R3 is independently a hydrocarbon group having 1 to 3 carbon atoms and X− is an anionic atom or group,
• to a cellulose and mechanically decrystallizing the cellulose with a tank-drive media mill such that a reduction (P1) in crystallinity from said first adding is represented by calculation formula (1):
• P1=crystallinity (%) of cellulose before starting said first adding−crystallinity (%) of cellulose after completing said first adding (1)
• reaches 1 to 60%, thereby obtaining a mixture,
• second, adding a basic compound to the mixture obtained from said first adding in an amount of 0.01 to 1 equiv per one mole of anhydroglucose unit of the cellulose in the mixture and mechanically decrystallizing the cellulose with a tank-drive media mill such that a reduction (P2) in crystallinity from said second adding represented by calculation formula (2):
• P2=crystallinity (%) of cellulose before starting said second adding−crystallinity (%) of cationized cellulose after completing said second adding (2)
• reaches 1 to 80%, thereby producing a cationized cellulose;
• and
• reacting the cationized cellulose with an alkylene oxide having from 2 to 4 carbon atoms,
• wherein the cellulose is allowed to react with a cationizing agent represented by formula (1) during said second adding.

A method of producing a cationized hydroxyalkylcellulose, the method comprising:

• first, adding a basic compound to a cellulose in an amount of 0.01 to 1 equiv per one mole of anhydroglucose unit of the cellulose and mechanically decrystallizing the cellulose with a tank-drive media mill such that a reduction (P3) in crystallinity from the first adding represented by calculation formula (3):
• P3=crystallinity (%) of cellulose before starting said first adding−crystallinity (%) of cellulose after completing said first adding (3)
• reaches 1 to 60%, thereby obtaining a mixture, and
• second, adding a cationizing agent represented by formula (1):
• wherein each of R1 to R3 is independently a hydrocarbon group having 1 to 3 carbon atoms and X− is an anionic atom or group,
• to the mixture obtained from said first adding and mechanically decrystallizing the cellulose with a tank-drive media mill such that a reduction (P4) in crystallinity from said second adding is represented by calculation formula (4):
• P4=crystallinity (%) of cellulose before starting said second adding−crystallinity (%) of cationized cellulose after completing said second adding (4)
• reaches 1 to 80%, thereby producing a cationized cellulose;
• and
• reacting the cationized cellulose with an alkylene oxide having from 2 to 4 carbon atoms,
• wherein the cellulose is allowed to react with a cationizing agent represented by formula (1) during said second adding.