Concentrated dispersions containing a water soluble cationic polysaccharide, method for their preparation and their use in cosmetic compositions

摘要

The invention discloses stable concentrated aqueous dispersions of a system constituted by at least one cationic polysaccharide soluble or dispersible in water and at least one surfactant, comprising: 0.5 to 30 wt.%, preferably 10 to 30 wt.%, of cationic polysaccharide particles soluble or dispersible in water (Pcat); 20 to 50 wt.%, expressed as dry matter, of a surfactant (TA); a hydrocarbon compound (OH) comprising at least one hydroxyl grouping, with a molar weight of less than 1000, in an amount corresponding to 0.1 to 10 parts by weight per part of polymer (Pcat); 0 to 10 wt.% of a water soluble inorganic salt (Sinorg); 0 to 1 wt.% of a stabilising agent (Stab); 5 to 50 wt.% of water (W). The invention also discloses a method for their preparation, comprising the addition of a premix (A) free from water and consisting of a cationic polysaccharide (Pcat) in powder form and of a hydrocarbon compound (OH) in liquid form, to a premix (B) with a viscosity less than 50000 mPa.s., consisting of water, of a surfactant (TA), optionally of a water soluble inorganic salt (Sinorg), optionally of a stabilising agent (Stab) and optionally of a hydrocarbon compound (OH). The invention also concerns their use in the preparation of cosmetic compositions, and cosmetic compositions containing them.