A cellulosic material contains a cellulose derivative, and the cellulose derivative contains an ionic moiety as a chemical structure common to an ionic liquid. It is preferred that the ionic moiety has an imidazolium salt structure. It is also preferred that the ionic moiety is introduced into a repeating unit of a polymer chain having a repeating structure introduced into a cellulose backbone structure of the cellulose derivative.

Provided are low-substituted hydroxypropyl cellulose (L-HPC) having a hydroxypropoxy content of from 5 to 16% by weight, and having, on a basis of a dynamic image analysis to divide all particles into fine, spherical, and fibrous particles consisting of long and short fibrous particles, a volume fraction of the long fibrous particles of from 15 to 50% and a volume fraction of the short fibrous particles of from 23 to 60%; and a solid preparation containing the L-HPC. Also provided is a method for producing the L-HPC including the steps: bringing sheet-like or chip-like pulp having a length-weighted average fiber length of from 2.40 to 3.50 mm into contact with an alkali metal hydroxide solution, reacting the resulting alkali cellulose with propylene oxide, and dispersing the resulting reaction product in water containing an acid to partially dissolve it therein, followed by neutralization with an acid to precipitate crude L-HPC.

Provided are low-substituted hydroxypropyl cellulose (L-HPC) having a hydroxypropoxy content of from 5 to 16% by weight, and having, on a basis of a dynamic image analysis to divide all particles into fine, spherical, and fibrous particles consisting of long and short fibrous particles, a volume fraction of the long fibrous particles of from 15 to 50% and a volume fraction of the short fibrous particles of from 23 to 60%; and a solid preparation containing the L-HPC. Also provided is a method for producing the L-HPC including the steps: bringing sheet-like or chip-like pulp having a length-weighted average fiber length of from 2.40 to 3.50 mm into contact with an alkali metal hydroxide solution, reacting the resulting alkali cellulose with propylene oxide, and dispersing the resulting reaction product in water containing an acid to partially dissolve it therein, followed by neutralization with an acid to precipitate crude L-HPC.

There is provided is a hydroxyalkyl alkyl cellulose exhibiting good flowability and high compressibility. More specifically, provided are a hydroxyalkyl alkyl cellulose having a volume-based average particle diameter, determined by dry laser diffractometry, of 50 to 100 m, and having, on a basis of a dynamic image analysis to divide all particles into fine particles, spherical particles and fibrous particles, a volume fraction of the fibrous particles consisting of long and short fibrous particles relative to all of the particles of 45 to 70%, and a volume fraction of the fine particles relative to all of the particles of less than 2.0%; a solid preparation including the hydroxyalkyl alkyl cellulose; and others.

There is provided is a hydroxyalkyl alkyl cellulose exhibiting good flowability and high compressibility. More specifically, provided are a hydroxyalkyl alkyl cellulose having a volume-based average particle diameter, determined by dry laser diffractometry, of 50 to 100 m, and having, on a basis of a dynamic image analysis to divide all particles into fine particles, spherical particles and fibrous particles, a volume fraction of the fibrous particles consisting of long and short fibrous particles relative to all of the particles of 45 to 70%, and a volume fraction of the fine particles relative to all of the particles of less than 2.0%; a solid preparation including the hydroxyalkyl alkyl cellulose; and others.

A cellulosic material contains a cellulose derivative, in which the cellulose derivative has a functional group capable of reversibly performing a redox reaction introduced thereinto. The cellulose derivative preferably has at least one of a ferrocene structure and a viologen structure as the functional group.

A cellulosic material contains a cellulose derivative, in which the cellulose derivative has a functional group capable of reversibly performing a redox reaction introduced thereinto. The cellulose derivative preferably has at least one of a ferrocene structure and a viologen structure as the functional group.

Disclosed are cellulose-based flexible aerogels and xerogels containing bacterial cellulose nanorods, ribbons, fibers, and the like, wherein the gels have tunable optical, heat transfer, and stiffness properties. Further disclosed are highly transparent and flexible cellulose nanofiber-polysiloxane composite aerogels featuring enhanced mechanical robustness, tunable optical anisotropy, and low thermal conductivity.

This invention relates to improved cellulose nanocrystal fillers for rubber compositions and more specifically with the grafting of disulfide and thioesters onto cellulose nanocrystals for improved performance as a filler in rubber compositions. At least one embodiment describes a method to graft thiols or disulfides on CNC surfaces via esterification exemplified by 3-mercapto-propionic acid (MPA), 3-(acetylthio) propionic acid (APA), or dithiodipronanoic acid (DTDPA). The reaction may be carried out on CNCs highly dispersed in a suitable solvent and improved reaction conditions to achieve a favorable degree of substitution, DS. The embodiment further discloses how surface thiol groups can then be protected, in a second step, as thioesters or asymmetric disulfides to tune the hydrophobicity of CNCs to improve compatibility with styrene-butadiene, SBR, or natural rubbers.

This invention relates to improved cellulose nanocrystal fillers for rubber compositions and more specifically with the grafting of disulfide and thioesters onto cellulose nanocrystals for improved performance as a filler in rubber compositions. At least one embodiment describes a method to graft thiols or disulfides on CNC surfaces via esterification exemplified by 3-mercapto-propionic acid (MPA), 3-(acetylthio) propionic acid (APA), or dithiodipronanoic acid (DTDPA). The reaction may be carried out on CNCs highly dispersed in a suitable solvent and improved reaction conditions to achieve a favorable degree of substitution, DS. The embodiment further discloses how surface thiol groups can then be protected, in a second step, as thioesters or asymmetric disulfides to tune the hydrophobicity of CNCs to improve compatibility with styrene-butadiene, SBR, or natural rubbers.