Dust-free hair bleach powders

Details Dust-free hair bleach powders Dust-free hair bleach powders

1997-04-29

1998-07-21

Kishore, Gollamudi S.

Drug, bio-affecting and body treating compositions

Bleach for live hair or skin

424 701, 424DIG3, 424489, 5147724, 132208, 8101, 8111, A61K 707, A61K 7075, A61K 7135

Patent

active

057831750

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. FIELD OF THE INVENTION
The present invention relates to substantially dust-free bleaching formulations. More specifically, the invention is directed to substantially dust-free hair bleaching powders comprising at least one de-dusting agent and at least one peroxygenated salt. The invention also provides hair bleaching powders that, when mixed with aqueous hydrogen peroxide, yield an activated bleaching composition that can flow evenly through hair. More specifically, the bleaching powders of the invention also comprise powdered polytetrafluoroethylene (PTFE), which improves the viscosity and slip characteristics of the activated bleaching composition.
2. Background of the Invention
Conventional hair bleach powders are compositions which are used for lightening hair color. Typically, these products are sold to the consumer as dry powders, which must be mixed with aqueous solutions of hydrogen peroxide before they are used. Upon mixing, the components in the bleach powder and the hydrogen peroxide solution form an activated bleaching composition which is then applied to the hair. The activated bleaching composition lightens the hair by oxidizing natural hair pigments, such as melanin.
Typical hair bleach powders contain a reactant which interacts with hydrogen peroxide to form oxygen, which breaks down melanin in hair. Commonly, such reactants include, inter alia, peroxygenated ammonium, sodium or potassium salts of persulfates, perborates, percarbonates and the like.
It is usually necessary for adequate oxygen formation to have an activated bleach composition with a pH in the range of 9.5-11.5 upon addition of the hydrogen peroxide solution. The peroxide and the persulfate are both acids, which are activated at a basic pH. Accordingly, it is common to add a base, such as an amine alkali compound or a metasilicate, to hair bleach powders.
Conventional hair bleach powders may also contain other additives including thickeners, such as hydroxy-alkylated cellulose, that help form the powder base. Such bleach powders are also susceptible, upon storage, to degradation resulting from atmospheric moisture. Thus, it is also common to add desiccants, such as silica derivatives, to prevent the bleach powders from being degraded by moisture before use.
There are several disadvantages associated with conventional hair bleach powders. Specifically, conventional bleach powders have a tendency to form dust during handling, transport and storage. Dusting also occurs during transfer of the bleach powder to the mixing chamber prior to admixing with the aqueous solution of hydrogen peroxide. Moreover, the persulfates and the alkaline silicate reactants are corrosive, and can be dangerous to the handler. These dusts irritate the eyes, the respiratory canal and the mucous membranes. Ammonium persulfate is an especially problematic irritant.
For these reasons, various attempts have been made to reduce the dusting characteristics of hair bleach powders. Partial success has been achieved through the addition of substantially water insoluble compounds, such as oils or liquid waxes, to the bleach powder. These oils or waxes coat the individual powder particles and agglomerate them into larger sized particles. Such bleach powders are thus rendered substantially dust-free due to their lack of small particles.
Published European Patent Application Publication No. 0583,767 A2, ("EP '767"), provides an example of this approach. EP '767 discloses a dry free flowing, dust-free hair bleach powder, wherein a powder base comprising ammonium, sodium and potassium persulfate salts is treated with "inert adsorbates" or inert liquids which include, inter alia, mineral oils, natural oils and fluorosilicone fluids.
These inert liquid additives, which are oils, are disclosed as performing two functions: (1) as an adhesive to aggregate small powder particles into particles having a size greater than 40.mu. and (2) as a lubricant to coat the particles so they do not abrade and form dust. Therefore, the inert liquid additi

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