Drug – bio-affecting and body treating compositions – Bleach for live hair or skin
Reexamination Certificate
1998-01-20
2001-09-18
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Bleach for live hair or skin
C424S070100, C424S070110, C424S070220
Reexamination Certificate
active
06290939
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to improved hair bleaches, and more particularly to dust free hair bleaches and methods of their manufacture.
BACKGROUND OF THE INVENTION
Hair bleach routinely originates as a powdery mixture of ingredients which are then transformed into a paste by mixing with water or other liquid. Hair bleach often contains active ingredients which include an oxidizing agent and an alkaline agent. These agents are often in the form of small particles and have the disadvantage of dusting. The oxidizing and alkaline agents may be harmful if ingested or inhaled; therefore it is desirable to obtain a hair bleach that does not cause this dusting.
Others have apparently attempted to control or reduce the dusting in powdered bleaching compositions. The use of materials such as paraffinic oil and/or waxes is discussed in EP 0,560,088 A1 where the patentees claim they dedust, the bleaching composition by spray application of paraffinic oils and/or waxes. Also, EP 0,583,767 A2 discusses a process for the dedusting of bleaching compositions of specified particle size by the spray application of mineral oil, silicone oil or natural oil. Additionally, U.S. Pat. Nos. 5,622,691 and 5,612,022 state that they achieve dedusting by the application of a water soluble block and/or linear random polyoxyethylene/ polyoxypropylene copolymer. French Patent No. 2,703,588 attempts dedusting by the application of a polypropylene glycol (optionally mixed with a polyalkylene glycol) in a solvent to a bleaching composition of controlled particle size, with the subsequent removal of the solvent.
EP 0,630,643 A1 discusses the spray application of molten polyethylene glycol waxes to bleaching compositions of controlled particle size, followed by subsequent grinding of the composition to eliminate agglomerations caused by the processing. Similarly, EP 0,574,696 A2 discusses a process where two dedusting agents are applied, with the first being a neutralized copolymer of methacrylic acid and methyl methacrylate and the second a water soluble cellulose derivative. None of these references, however, appears to provide a satisfactory dust free hair bleaching composition, nor do they provide a way to minimize the hair damage caused by the actual bleaching process. The methods of making such compositions are usually very process intensive.
SUMMARY OF THE INVENTION
The present invention provides for a composition for bleaching hair comprising: (a) from about 40% to about 70% by weight of a peroxygen compound, and (b) from 0.5% to 15% by weight of a linear hydroxy terminated polyoxypropylene oligomer. The linear hydroxy terminated polyoxypropylene oligomer may comprise, for example, an oil-like material having a pour point less than 0 degress Fahrenheit.
The present invention also provides a process for the preparation of a composition for bleaching hair which comprises mixing a linear hyroxy terminated polyoxypropylene oligomer into a hair bleaching composition, spraying the mixture at room temperature to apply a uniform coating of the oligomer on particles of the hair bleaching composition, thereby causing the particles to agglomerate so as to render the composition essentially dust free during handling.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The bleaching of hair is conventionally accomplished by the application of compositions containing one or more oxidizing agents such as persulfates, percarbonates, peroxides or perborates, an alkali source such as an alkali silicate and various sundry ingredients designed to enhance performance, protect the hair and facilitate the physical handling and application of the bleaching composition. Typically the bleaching composition is mixed with a liquid component commonly known to those familiar with the art as the developer. The developer typically contains hydrogen peroxide and is mixed in varying portions with the bleaching composition to form a viscous liquid or paste-like material which is then applied to the hair to produce the desired bleaching effect.
The bleaching process is decidedly aggressive towards the hair and can result in damage to the hair. The extent of the damage to the hair may be affected by the condition of the hair prior to bleaching, the duration of the bleaching process and/or the bleaching composition itself.
In most cases the bleaching composition is a powder which has fine particles of varying size and is therefore prone to dusting during handling and during any mixing processes. This dust, which may contain various oxidizers, alkalis and other ingredients, is highly irritating to the lungs.
To remedy this persistent problem, the present invention provides an improved composition for bleaching hair comprising: (a) a peroxygen compound, and (b) a linear hydroxy terminated polyoxypropylene oligomer from about 0.5% to about 15% by weight relative to the total weight of the composition. Preferably, the linear hydroxy terminated polyoxypropylene oligomer comprises a water insoluble material having a pour point less than 0 degress Fahrenheit and has a viscosity between 50 and 2000 centistokes (cSt) at room temperature. The linear hydroxy terminated polyoxypropylene oligomer should preferably have a molecular weight between 300 and 2000 daltons and a single hydroxy terminal group. In a preferred embodiment, the linear hydroxy terminated polyoxypropylene oligomer has a tertiary head group. The head group may be a tertiary butyl. The linear hydroxy terminated polyoxypropylene oligomer preferably will reduce hair damage resulting from a bleaching process.
In one embodiment of the present invention, the peroxygen compound comprises a persulfate, a percarbonate, or a perborate. The composition may be combined with a developer, such as a hydrogen peroxide solution. The developer may be used to make a paste of the bleach to apply it to hair.
The present invention also provides a process for preparing a bleach composition which comprises mixing a linear hydroxy terminated polyoxypropylene oligomer with a powdery oxidizing agent by spraying the linear hydroxy terminated polyoxypropylene oligomer at room temperature, so as to apply an essentially uniform coating of the linear hydroxy terminated polyoxypropylene oligomer to the powdery oxidizing agent, thereby rendering the oxidizing agent essentially dust free. Preferably, the linear hydroxy terminated polyoxypropylene oligomer has a tertiary butyl head group.
Composition
The present invention provides a powdered composition for bleaching hair consisting essentially of at least one oxidizing agent selected from any peroxygen compound and wherein from 0.5% to 15% by weight relative to the total weight of the composition of a linear hydroxy terminated polyoxypropylene oligomer.
The hair bleach composition of the present invention may further comprise: (1) one or more oxidizing agents such as a peroxygen compound, such as a persulfate, a percarbonate, a peroxide or a perborate, (2) an alkali source such as an an alkali earth hydroxide, an alkali earth carbonate, an alkali silicate (e.g., Na silicate, K silicate, a meta silicate, an orthosilicate), a sodium carbonate or a potassium carbonate. The composition may also include other ingredients designed to enhance performance, protect the hair and facilitate the physical handling and application of the bleaching composition.
In another embodiment, the composition may comprise: (1) one or more oxidizing agents and (2) an alkali source.
A developer may be combined with the composition. The developer may comprise a simple hydrogen peroxide solution, which may be from about 3% to about 15% active hydrogen peroxide, and may be in the form of a moderately viscous cream or emulsion containing conditioners and/or emulsifying agents.
Linear Hydroxy Terminated Polyoxypropylene Oligomer
The linear hydroxy terminated polyoxypropylene oligomer used in practicing the present invention is preferably an oil-like substance having a pour point less than 0 degress Fahrenheit, a viscosity between 50 and 2000 centistokes (cSt) at room temperature, and
CCP, Incorporated
Cooper & Dunham LLP
Howard S.
Katz Robert D.
Page Thurman K.
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