Supplementation of cellulose nanofibrils with carboxycellulose which has a low degree of substitution

Compositon according to the preceding claim, characterized in that the nanofibrils have a degree of crystallinity of between 15% and 50%.

Composition according to any one of the preceding claims, characterized in that the cellulose nanofibrils are obtained from cells consisting of at least 80% primary walls.

Composition according to the preceding claim, characterized in that the cellulose nanofibrils are charged with acids and with acidic polysaccharides, alone or as a mixture.

Composition according to any one of the preceding claims, characterized in that it comprises at least one co-additive chosen from:

• saccharide monomers or oligomers,
• compounds of formula (R1R2N)COA, in which formula R1 and R2, which may be identical or different, represent hydrogen or a C1-C10, preferably C1-C5, alkyl radical, A represents hydrogen, a C1-C10, preferably C1-C5, alkyl radical or alternatively the group R′1R′2N with R1 and R′2, which may be identical or different, representing hydrogen or a C1-C10, preferably C1-C5, alkyl radical,
• cationic or amphoteric surfactants, it being possible for these co-additives to be used alone or as a mixture.

Composition according to any one of the preceding claims, characterized in that the co-additive content is less than 30% by weight relative to the weight of nanofibrils and of additive and of co-additive.

Composition according to any one of the preceding claims, characterized in that the co-additive is chosen from saccharide monomers or oligomers or compounds of formula (R1R2N)COA with a content of between 1 and 25% by weight relative to the weight of nanofibrils and of additive and of co-additive.

Composition according to any one of the preceding claims, characterized in that the co-additive is chosen from cationic and amphoteric surfactants with a content of between 1 and 10% by weight relative to the weight of nanofibrils and of additive and of co-additive.

Composition according to any one of the preceding claims, characterized in that the content of additive and of co-additive is between 5 and 30% by weight relative to the weight of nanofibrils and of additive and of co-additive.

Composition according to any one of the preceding claims, characterized in that the solids content is at least 40% by weight.

Process for preparing a composition according to any one of the preceding claims, in which cellulose nanofibrils are prepared from cellulosic pulp which makes it possible to obtain cellulose nanofibrils with a degree of crystallinity of less than or equal to 50%, by carrying out at least one extraction, optionally at least one step of bleaching of the pulp thus treated, after which the resulting pulp is separated out, and a homogenization step is carried out in at least one cycle, characterized in that the following steps are carried out:

• at least some of the additive and optionally co-additive(s) is added to the nanofibril suspension which has optionally undergone at least one homogenization cycle,
• a step of drying the suspension thus supplemented is carried out.

Preparation process according to the preceding claim, in which cellulose nanofibrils are prepared from cellulosic pulp comprising cells consisting of at least about 80% primary walls.

Preparation process according to the preceding claim, characterized in that a blending step is carried out after the drying.

Suspension according to the preceding claim, characterized in that it has a Theological profile of shear-thinning type.

Use of carboxycellulose, and optionally of co-additives, with cellulose nanofibrils which have a degree of crystallinity of less than or equal to 50%, for the purpose of conserving a shear-thinning Theological profile for a suspension comprising cellulose nanofibrils with a degree of crystallinity of less than or equal to 50% which have undergone a drying step.