To provide a cellulose derivative excellent in thermoplasticity, water resistance and strength (elastic modulus, impact strength), a cellulose derivative, which is obtained by introducing a short-chain organic group (acetyl group), a medium-chain organic group having 3 to 5 carbon atoms and a long-chain organic group having 6 to 30 carbon atoms at the following substitution degrees DSs into a cellulose, is used: Short-chain organic group: 0.7DS.sub.SH1.5; Medium-chain organic group: 0.5DS.sub.ME2.0; Long-chain organic group: 0.1DS.sub.LO<0.5; and 2.4DS.sub.SH+DS.sub.ME+DS.sub.LO3.

To provide a cellulose derivative excellent in thermoplasticity, water resistance and strength (elastic modulus, impact strength), a cellulose derivative, which is obtained by introducing a short-chain organic group (acetyl group), a medium-chain organic group having 3 to 5 carbon atoms and a long-chain organic group having 6 to 30 carbon atoms at the following substitution degrees DSs into a cellulose, is used: Short-chain organic group: 0.7DS.sub.SH1.5; Medium-chain organic group: 0.5DS.sub.ME2.0; Long-chain organic group: 0.1DS.sub.LO<0.5; and 2.4DS.sub.SH+DS.sub.ME+DS.sub.LO3.

The invention relates to the technology for the production of celluloses having improved properties and increased reactivity, and can be used in their chemical processing, including finished batches for the production of nitrocellulose and other products. A method for improving the quality and reactivity of cellulose comprises the following steps: impregnating and hydrolyzing the cellulose in a hydrolysis solution, filtering it from the hydrolysis solution, washing it with squeezing and drying. Moreover, the stages of impregnation and hydrolysis of cellulose in hydrolysis solution, filtration from hydrolysis solution, washing, squeezing and drying are carried out with simultaneous thermovacuum-impulse action by cycles, each of which includes the heating of cellulose to a temperature of not more than 115 C., high-speed impulse action of vacuum for time of less than 10 seconds, followed by exposure of the cellulose under vacuum and vacuum relief. The method allows improving the quality of cellulose, including its reactivity.

The invention relates to the technology for the production of celluloses having improved properties and increased reactivity, and can be used in their chemical processing, including finished batches for the production of nitrocellulose and other products. A method for improving the quality and reactivity of cellulose comprises the following steps: impregnating and hydrolyzing the cellulose in a hydrolysis solution, filtering it from the hydrolysis solution, washing it with squeezing and drying. Moreover, the stages of impregnation and hydrolysis of cellulose in hydrolysis solution, filtration from hydrolysis solution, washing, squeezing and drying are carried out with simultaneous thermovacuum-impulse action by cycles, each of which includes the heating of cellulose to a temperature of not more than 115 C., high-speed impulse action of vacuum for time of less than 10 seconds, followed by exposure of the cellulose under vacuum and vacuum relief. The method allows improving the quality of cellulose, including its reactivity.

According to an example aspect of the present invention, there is provided a method of improving the reactivity and processability of cellulose in order to utilize cheap and easily available raw material and obtain excellent performance for biomaterial manufacturing.

According to an example aspect of the present invention, there is provided a method of improving the reactivity and processability of cellulose in order to utilize cheap and easily available raw material and obtain excellent performance for biomaterial manufacturing.

According to an example aspect of the present invention, there are provided oleophilic cellulosic and/or lignocellulosic fibres, wherein the oleophilic cellulosic and/or lignocellulosic fibres are capable of retarding oil and/or grease migration.

According to an example aspect of the present invention, there are provided oleophilic cellulosic and/or lignocellulosic fibres, wherein the oleophilic cellulosic and/or lignocellulosic fibres are capable of retarding oil and/or grease migration.

The invention relates to Janus-type spherical cellulose nanoparticles and processes for producing them. The Janus-type spherical cellulose nanoparticles of the invention are chemically modified on one face only, producing particles with a lipophilic face opposite a hydrophilic face. Such particles demonstrate superior surfactant properties and can be used to prepare Pickering emulsions.

The invention relates to Janus-type spherical cellulose nanoparticles and processes for producing them. The Janus-type spherical cellulose nanoparticles of the invention are chemically modified on one face only, producing particles with a lipophilic face opposite a hydrophilic face. Such particles demonstrate superior surfactant properties and can be used to prepare Pickering emulsions.