Abstract: Disclosed are compounds, in particular based on polysaccharides, that are adsorbed on a cellulosic material, and relates in particular to the application of such compounds as reinforcing agent for cellulosic materials, in the wet and/or dry state. The compounds include a combination of at least one polysaccharide adsorbed on a cellulosic material, the polysaccharide including at least two different monosaccharide units, forming first and second monosaccharide units, the second monosaccharide units being branched on a chain including at least the first monosaccharide units, at least some of the second monosaccharide units being non-cyclic and bearing aldehyde functions, the aldehyde functions possibly forming hemiacetal functions with hydroxy functions of the cellulosic material.

Abstract: The invention concerns a colloidal dispersion, in an organic solvent, of a microfibrillated and/or microcrystalline particles of a fibrillated organic substance selected among the group consisting of cellulose, chitin, polysaccharides such as ?1?3 glucan, ?1?3 xylan and ?1?4 mannan, further containing a compound having a hydrophilic part and a hydrophobic part.