Granulated composition based on peroxidized derivatives for bleaching hair and process for the preparation of the said compositions
AssigneeL'oreal
InventorsJean-Marie Millequant, Caroline Tricaud, Anne Gaboriaud
Life of this patent
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Abstract
A granulated composition for bleaching hair compresses granules of a pulverulent material which is sodium persulfate, potassium persulfate, ammonium persulfate, sodium perborate, potassium perborate, ammonium perborate, barium peroxide, strontium peroxide and mixtures thereof bound together with propylene glycol having a molecular weight ranging from 200 to 10,000. The binder is present in an amount not exceeding 25 percent by weight of the composition.
Claims18
A granulated composition for bleaching hair comprising granules of a pulverulent material comprising a member selected from the group consisting of sodium persulfate, potassium persulphate, ammonium persulfate, sodium perborate, potassium perborate, ammonium perborate, barium peroxide, strontium peroxide and mixtures thereof, said granules having a particle size ranging from 65 μm to 800 μm and being bound together with a binder consisting essentially of polypropylene glycol having a molecular weight ranging from 200 to 10,000, said binder being present in said composition in an amount not exceeding 25 percent by weight based on the total weight of said composition.
A process for preparing a granulated composition for bleaching hair comprising granules of a pulverulent material comprising a member selected from the group consisting of sodium persulfate, potassium persulfate, ammonium persulfate, sodium perborate, potassium perborate, ammonium perborate, barium peroxide, strontium peroxide and mixtures thereof, said process comprising
- preparing a moving bed of said pulverulent material so as to granulate said pulverulent material,
- spraying on said moving bed of said pulverulent material a binder consisting essentially of polypropylene glycol having a molecular weight ranging from 200 to 10,000, said binder being in the form of a solution in a solvent selected from the group consisting of a C1-C4 alcohol, methylene chloride, ethylene chloride and mixtures thereof,
- and removing said solvent so as to produce said granules of said granulated composition, said granules having a size ranging from 65 μm to 800 μm and said binder being present in an amount not exceeding 25 percent by weight based on the total weight of said composition.
Dependencies are inferred from the claim text.