The present invention provides a method for derivatizing cellulose pulp at high solids content or even at a fully dry state without pretreating the cellulose, the method comprising preparing a reaction medium comprising urea and at least one derivatization reagent; carrying out a chemical derivatization reaction between the at least one derivatization reagent and the cellulose pulp in a reaction system comprising the cellulose pulp in contact with the reaction medium; and optionally purifying and/or recovering the derivatized cellulose product. The present description also relates to products obtainable using said method.

The present invention provides a method for derivatizing cellulose pulp at high solids content or even at a fully dry state without pretreating the cellulose, the method comprising preparing a reaction medium comprising urea and at least one derivatization reagent; carrying out a chemical derivatization reaction between the at least one derivatization reagent and the cellulose pulp in a reaction system comprising the cellulose pulp in contact with the reaction medium; and optionally purifying and/or recovering the derivatized cellulose product. The present description also relates to products obtainable using said method.

The present invention provides novel hybrid polymers having unique physical properties. The hybrid polymers comprise a cellulose ether moiety, a linking group moiety, a spacer group moiety, and a lactam moiety. The present invention also provides compositions comprising the hybrid polymers and methods for preparing and using the hybrid polymers.

In a first embodiment, the hybrid polymers have the structure:

A-(L.sub.1-S—(B).sub.k).sub.q

wherein A is derived from a cellulose ether moiety comprising a —OH group; L.sub.1 is a linking group moiety selected from the group consisting of urethanes, amides, esters, carbonates, and phosphate esters, or is derived from a moiety selected from the group consisting of anhydrides, cyclic ethers, and aziridines; S is a spacer group moiety, selected from the group consisting of straight- or branched-chain functionalized and unfunctionalized alkyl, cycloalkyl, alkenyl, and aryl groups, wherein any of the above groups may be with or without heteroatoms, or is a direct bond; and B is a lactam moiety; wherein k≥1 and q≥1.

In a second embodiment, the hybrid polymers have the structure:

A-(L.sub.2-S—B).sub.y

wherein A is derived from a cellulose ether moiety comprising a —OH group; L.sub.2 is an ether linking group moiety; S is a spacer group moiety, selected from the group consisting of straight- or branched-chain functionalized and unfunctionalized alkyl, cycloalkyl, alkenyl, and aryl groups, wherein any of the above groups may be with or without heteroatoms, or is a direct bond; and B is a lactam moiety; wherein y≥1; with the proviso that when the cellulose ether moiety is hydroxyethyl cellulose, -(L.sub.2-S—B).sub.y is not derived from 1-(hydroxymethyl)-2-pyrrolidinone.

The present description is related to methods for derivatizing cellulose pulp, and to products obtainable using said method.

The present disclosure relates to the environmentally preparation of nanocellulose and derivatives thereof. The invention further relates to the preparation of cellulose derivatives.

The present disclosure relates to the environmentally preparation of nanocellulose and derivatives thereof. The invention further relates to the preparation of cellulose derivatives.

The present disclosure generally relates to open chain modified cellulosic pulps and methods for making and using the same. More specifically, the open chain modified cellulosic pulps described herein may be made by oxidation of a cellulosic pulp, followed by reduction of the oxidized groups, resulting in a modified pulp having an improved open chain configuration that may be more efficiently converted into cellulosic derivative products. This disclosure further relates to improved cellulosic derivative products made therefrom, for example, cellulose esters, cellulose ethers, and regenerated cellulose products.

The present disclosure generally relates to open chain modified cellulosic pulps and methods for making and using the same. More specifically, the open chain modified cellulosic pulps described herein may be made by oxidation of a cellulosic pulp, followed by reduction of the oxidized groups, resulting in a modified pulp having an improved open chain configuration that may be more efficiently converted into cellulosic derivative products. This disclosure further relates to improved cellulosic derivative products made therefrom, for example, cellulose esters, cellulose ethers, and regenerated cellulose products.

An object of the present invention is to provide a pulverized pulp in which the viscosity reduction caused by pulverization is mitigated and a method for producing cellulose ethers using such pulverized pulp. The above object is achieved by a pulverized pulp of being a pulverized product of a raw material pulp having a pH of 7.5 to 10.5 when measured by dispersing the raw material pulp in water, and having a percent decrease of 30% or less in viscosity caused by pulverization; and a method of producing a cellulose ether including reacting an alkali cellulose obtained from the pulverized pulp and an alkali metal hydroxide solution with an etherifying agent to obtain the cellulose ether.

Provided is a method for producing a cellulose ether including a drying step capable of continuously and stably drying a highly adhesive wet cellulose ether with high thermal efficiency without causing adhesive growth and solidification of the wet cellulose ether in a dryer. More specifically, the method for producing a cellulose ether includes a step of drying a wet cellulose ether having water content of more than 50% by weight in a rotary type through-flow dryer.