Drug – bio-affecting and body treating compositions – Live hair or scalp treating compositions
Reexamination Certificate
2000-07-27
2003-09-02
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Live hair or scalp treating compositions
C424S070110, C424S045000, C424S047000, C424S401000, C424S078030, C514S772300
Reexamination Certificate
active
06613314
ABSTRACT:
The present invention relates to a reshapable hair styling composition.
Fixing the hairstyle is an important element in hair styling, and involves maintaining a shaping that has already been carried out, or in simultaneously shaping and fixing the hair.
In accordance with the invention, the term “hair styling composition” relates to any kind of hair composition that can be used to effect hair styling, for example fixing compositions, shampoos, conditioners, permanent waving compositions, hair care products, and hair treatment products.
The most prevalent hair styling compositions on the cosmetic market for shaping and/or maintaining the hairstyle are spray compositions comprising a solution, usually alcohol- or water-based, and one or more materials, generally polymer resins. One of the functions of polymer resins is to form links between the hairs, these materials also being called fixatives, in a mixture with various cosmetic adjuvants. This solution is generally packaged either in an appropriate aerosol container, which is pressurized with the aid of a propellant, or in a pump flask.
Other known hair styling compositions include styling gels and mousses, which are generally applied to the wetted hair before brushing or setting it. In contrast to the conventional aerosol lacquers, these compositions have the disadvantage that they do not allow the hair to be fixed in a shape created before their application. In fact, these compositions are essentially aqueous and their application wets the hair and is therefore unable to maintain the initial shape of the hairstyle. In order to shape and fix the hairstyle, therefore, it is necessary to carry out subsequent brushing and/or drying.
Such hair styling compositions all have the same disadvantage that they do not allow the hairstyle to be later modified to a desired shape, which is other than that formed initially, without starting the styling and fixing operations again. Moreover, under various kinds of stress, the hairstyle has a tendency to take on an undesirable permanent set, which cannot easily be modified. Also in the styling process, one desires hair conditioning benefits, such as ease of combing and soft hair feel appearance.
A subject of the invention is a reshapable hair styling composition comprising, in a cosmetic vehicle appropriate for hair, at least one polyurethane.
Another subject of the invention is a reshapable hair styling composition comprising, in a cosmetic vehicle appropriate for hair, at least one dispersion comprising at least one polyurethane.
Another subject of the invention is a reshapable hair styling composition comprising, in a cosmetic vehicle appropriate for hair, at least one dispersion comprising at least one polyurethane and a water and/or solvent medium of dispersion.
Another subject of the invention is a reshapable hair styling composition comprising, in a cosmetic vehicle appropriate for hair, at least one dispersion comprising at least one polyurethane in a water and/or solvent medium of dispersion, said at least one polyurethane being obtained by reacting:
(a) an isocyanate terminated polyurethane prepolymer being obtained by reacting: (i) at least one polyactive hydrogen compound insoluble in said medium of dispersion, wherein said polyactive hydrogen compound is selected from alkyl, aryl, and aralkyl structures optionally substituted in and/or on the structure by N, O, and/or S groups; (ii) at least one polyisocyanate, and (iii) at least one polyactive hydrogen compound soluble in the medium of the dispersion,
(b) at least one polyfunctional chain extender; and
(c) at least one chain terminator.
The medium of dispersion can be, for example, an alcohol mixture or a water/alcohol mixture.
The term “reshapable” hair styling composition means a hair styling composition providing hair styling that can be restored or modified without new material or heat being applied. For example, in order to restore or modify the hairstyle in case of “drooping” or loss of setting (dishevelment), no new materials, such as water or any form of fixing agent, or heat are required. Thus, to provide a “reshapable” effect means to provide a hair styling that can be restored or modified without new material or heat being applied. The efficacy of the composition can be long lasting, such as 10-24 hours, giving rise to a durable styling effect. Other terms, which may be synonymous with reshapable, include repositionable, remoldable, restyleable, and remodellable.
It is a further subject of the invention to provide a method for treating hair, characterized in that the composition according to the invention is applied to the hair before, during, or after shaping the hairstyle.
As used herein, a “dispersion” means generally a two-phase system where one phase comprises discrete particles distributed throughout a bulk substance, the particles being the disperse or internal phase, and the bulk substance the continuous or external phase. In an embodiment of this invention, at least a portion of the polyurethane exists as the discrete particle in the continuous phase. The term “dispersion” does not necessarily mean that the entire polyurethane polymer needs to be insoluble; at least some of the polymer can be soluble in the medium. Dispersions may result from the use of certain components that are insoluble in the solvent system. It is desirable that the dispersion remains stable under ambient conditions. In one embodiment, the dispersions are stable at room temperature for more than 30 days, also for more than 90 days, further also for more than 180 days, and more further also for more than 360 days.
The polyurethane dispersion may be made by forming the isocyanate terminated polyurethane prepolymer, chain extending the prepolymer, and chain terminating the prepolymer to yield a polyurethane polymer that may be stable and dispersed in the water and/or solvent system. Although it is possible to carry out the foregoing steps sequentially, this is not necessary. The order of the steps may be changed and certain steps can be combined, such as chain extension and chain termination or prepolymer formation and chain termination. For example, an excess of chain extender can also serve as the chain terminator. The steps and the components are discussed in detail below.
As used herein the term “isocyanate terminated polyurethane prepolymer”, or alternately referred to as “isocyanate functional polyurethane prepolymer” means a reaction product of a mixture comprising at least one polyisocyanate, at least one medium insoluble polyactive hydrogen compound, and at least one medium soluble polyactive hydrogen compound. In general, the reaction occurs with a molar excess of isocyanate groups to produce an oligomer, which may have urethane, urea, and/or thiourethane functional groups. The prepolymer can be prepared at an equivalent ratio of isocyanate groups to active hydrogen reactive groups of greater than 1.6:1, also greater than 1.8:1, and further also about 2.0:1 or greater.
As used herein, the term “polyactive hydrogen compound” means a compound having an average functionality greater than 1, such as greater than 1.8, and further such as about 2.0 or greater but less than about 6, such as less than about 4, and further such as about 3 or less. The term is understood to include compounds that have (i) alcohol groups on primary, secondary, and tertiary carbon atoms, (ii) primary and secondary amines, (iii) mercaptans, and (iv) mixtures of these functional groups.
Accordingly, the inventive polyurethane dispersions can contain urea linkages, e.g., from the reaction of isocyanate functional polyurethanes with amines, these polymers more appropriately being labeled as “polyurethane-ureas”.
The polyactive hydrogen compounds useful for preparing the prepolymer have a molecular weight of 62 to 10,000, also 200 to 5,000, and further also 400 to 3,000.
The “A component,” also referred to as the (a)(i) component, i.e., the medium insoluble polyactive hydrogen compound, may generally be present at concentrations of at least 5% by weight, also at
Rollat Isabelle
Samain Henri
Bennett Rachel M.
L'Oreal
Page Thurman K.
LandOfFree
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