Kit for lightening or whitening a human keratinic material
The current invention proposes a skin lightening kit which is less harsh than
conventional products while being similarly efficacious with additional convenience to use.
5 This skin lightening kit comprises:
- (A) An oxidizing composition: composed of at least one oxidizing agent (Hydrogen
peroxide) and one jellifying polymer,
- (B) A liquid activator composition composed of at least one liquid alkali which has
ability to de-compose oxidizing agent.
10 - (C) A substrate in dry stage or impregnated with cosmetic formulation.
The activator composition (B) is intended to be mixed with oxidizing composition and
this mixture need to be applied on body surface,
The substrate (C) is intended to be placed on the mixture of oxidizing and activator
composition. The said substrate enhances efficacy of composition because of occlusion
15 effect and also facilitate easy removal of composition mixture from skin.
Background of the Invention
Skin color is mainly determined by melanin, a pigment synthesized in melanocytes
and found in basal layer of epidermis. Higher the melanin content, darker is the skin.
20 Heterogeneous distribution of melanin or hyperactivity of melanocytes causes nonuniform
skin tone and sometimes hyperpigmentation. Lightening of skin color or
smoothening of skin tone is often attempted by restricting melanin synthesis, accelerating
cell turn-over cycle (exfoliation), or promoting melanin decomposition.
Hydrogen peroxide for decomposing melanin is well known in prior art.
25 The basic mechanism of melanin decomposition by hydrogen peroxide relies on
catalysis of said hydrogen peroxide by an activator to release nascent oxygen and water.
The nascent oxygen is extremely reactive and unstable. As such, nascent oxygen causes
oxidation of melanin pigment thereby decomposing it.
The activators used for this are generally strong alkali salts that include ammonium
30 bi carbonate and potassium per sulfate.
This oxidative property of hydrogen peroxide is used in skin care and wound
management, as also in described in U.S. patent Nos. 6673374; 6117118; 5879716;
5653994; and 4826681.
Aims of the invention
Oxidizing agent based skin lightening products are generally sold in two separately
packed preparations, namely (a) the bleaching cream which generally contains hydrogen
peroxide and (b) and an activator usually in powder form to activate hydrogen peroxide.
5 The activators used for this are generally strong alkali salts that include ammonium
bicarbonate and potassium persulfate.
The conventional practice includes mixing of the two components, applying it on
skin, waiting for a specific time, general about 15 minutes, removing the composition
using a towel or tissue or sponge, followed by thorough rinsing. The presence of strong
10 alkaline activators allows high peroxide decomposition and hence a significant skin
lightening is obtained. Yet the strong alkalinity of these products makes them extremely
harsh for skin. The conventional users often complain of redness, itching, teary eyes and
overall discomfort after using these products. In addition, the usage methods for these
marketed products are also bothersome which steers away many potential users.
15 Therefore there is a strong need of developing new skin bleaching products, which are
more convenient, less harsh on skin but with similar lightening efficacy.
In a previous patent application (WO 2015/010955 to L'Oreal), it has already been
proposed a whitening kit as a solution to this technical problem. This kit is composed of a
first substrate sheet comprising an oxidizing composition and a second substrate sheet
20 comprising activators and intended to be applied on the first substrate sheet to
decompose hydrogen peroxide. The activators used in this previous patent application are
preferably in powder form for achieving good whitening efficacy but can also be liquid.
The present inventors have found that this previous,whitening kit may be further
improved. When the two sheets come into contact each other, only limited quantities of
25 the oxidizing composition and the activator comes into contact as, part of composition
remains embedded in the substrate sheet. Secondly, when both the compositions are
applied on the substrate sheet, it is difficult to avoid undesired areas on face such as eye
brows, area near lips, hairs near to ear and forehead. Thirdly, even after removing the
whitening kit, user need to wipe the face carefully, to make sure that there is no residue
30 on the face.
On the basis of the above explained limitations of state of the art relating to skin
whitening or lightening products, there is a need to develop a skin whitening or lightening
kit which is able to efficiently whiten or lighten the skin but present lower harsh or skin
irritation.
The present invention aims to solve the technical problem of providing a kit for
whitening or lightening a keratinic material while presenting lower harsh or skin irritation.
The present invention also aims to solve the technical problem of providing a kit for
whitening or lightening a keratinic material with an improved convenience to use the kit,
5 especially in comparison to prior art kits.
The present invention also aims to solve the technical problem of providing a kit for
whitening or lightening a keratinic material, improving the quantity of oxidizing agent and
activator coming into contact with each other.
The present invention also aims to solve the technical problem of providing a kit for
10 whitening or lightening a keratinic material, avoiding undesired areas of applications on
the keratinic material, especially for skin face application for example: eye brows, area
near lips, hairs near to ear or foreheads.
The present invention also aims to solve the technical problem of providing a kit for
whitening or lightening with easy removal, and preferably total removal, of the keratinic
15 material from the area of application.
Description of the invention
The invention relates notably to a kit for lightening or whitening a keratinic material,
said kit comprising at least three separate elements:
20 - an oxidizing composition, said composition comprising at least one oxidizing agent
and at least one jellifying polymer;
- a activating composition comprising at least one alkali agent decomposing the
oxidizing agent of said oxidizing composition; and
- a solid substrate.
25 The present invention also relates to a method of cosmetic treatment comprising
mixing the oxidizing composition and the activating composition and placing said solid
substrate on the composition, and waiting for certain time period. After the application
time, the solid substrate is removed and peels off the composition mixture. The removal of
the composition by the withdrawal of the solid substrate is easy and uniform.
30 The "keratinic material" means in particular skin, and more specifically skin of a
human being. The keratinic material is whitened or lightened especially at the area of
application of the oxidizing and activating compositions of the kit according to the
invention. "Keratinic material" designates a part of a keratinic material such as for example
a part of skin, especially the skin surface.
35
Oxidizinu wm~osition
Advantageously, the oxidizing composition comprises at least one oxidizing agent
and at least one jellifying polymer.
Advantageously, the oxidizing agent releases nascent oxygen while jellifying
5 polymer is advantageously used to avoid dripping of composition from skin surface and
easy removal of product from skin surface.
Oxidizing agent(s) in the oxidizing composition are not limited to specific species.
However, according to one specific embodiment, said oxidizing agent is selected from the
group consisting of hydrogen peroxide, inorganic peroxides, hypochlorites, permanganate
10 compounds, sodium perborate, ammonium perborate and any mixture thereof.
According to one embodiment, the concentration of oxidizing agent(s) ranges from
0.1 to 30 %; more preferably from 1 to 15 %; even more preferably from 2 to 7% by weight
relative to the total weight of the oxidizing composition.
According to one embodiment, the pH of the oxidizing composition ranges from 2 to
15 6 and preferably from 3 to 5. The most common acidifier for use in the oxidizing
composition is phosphoric acid.
The jellifying polymer in the oxidizing composition can be a film forming agent or
non-film forming agent, for example depending on the form of said solid substrate.
In one embodiment of invention, jellifying compound is a film forming polymer.
20 Advantageously said film forming polymer is able to make a dry film on skin surface.
Advantageously, the oxidizing composition is stabilized in a film foaming polymer.
Typically, said dry film can be peeled off with said solid substrate after a certain
application time of product on skin.
By "film forming polymer", it is referred to a polymer forming a continuous film after
25 drying. Generally, said polymer has adhesive properties in liquid state.
There is no limiting example of said jellifying polymer or film forming polymers.
According to one embodiment, said jellifying polymer or film forming polymer is selected
from the group consisting of vegetable starches, polyvinyl alcohol (PVA),
polyvinylpyrrolidone copolymers (PVP) cellulose and its derivatives such as
30 methylcellulose derivatives, quaternary ammonium cellulose, and any mixture thereof.
Furthermore, non-limiting examples of PVP classified on the basis of viscosity and
level of hydrolysis or Molecular weight are PVP K-15, PVP K-30, PVP K-60, PVP K-90,
PVP K-120, and any mixture thereof.
Furthermore, non-limiting examples of various cosmetically acceptable grades of
35 PVA based classified on the basis of viscosity and level of hydrolysis or Molecular weight
are PVA 4-88, PVA 5-88, PVA 8-88, PVA 18-88, PVA 26-88, PVA 40-88, BE-26, BE-24E,
BE-28 etc, and any mixture thereof.
In one embodiment of invention, the solid substrate is a wet substrate and the
jellifying polymer in oxidizing comp?sition is a thickener. In this embodiment said solid
5 substrate doesn't allow the composition to get dry and after removal of said solid substrate
from skin surface, the composition still remains on surface.
By "thickenei' or "thickening agent" is meant a substance which increases the
viscosity of a composition. Preferably said thickener does not substantially modifying its
other properties.
10 According to one embodiment, said thickener can is selected from the group
consisting of: vegetable starches, casein, gelatin, polyacrylamides, polyvinylalcohol,
polyacrylic acid, polyamines, polyethyleneimines, polyvinylpyrrolidone copolymers (PVP),
polyethylene glycols, cellulose and its derivatives such as methylcellulose derivatives,
quaternary ammonium cellulose, carboxymethyl cellulose, xanthan gum, agar, pectin
15 gum, guar gum and their derivatives, carboxypolymethylene, and any mixture thereof.
Non limiting examples of polyacrylic acids based thickners are Sodium
Polyacrylates, Pottasium. Polyacrylates, liner polyacrylamide, crosslinked
polyacrylamides, hydrophobically modified polyacrylates, carbopols, Hydrosorb@,
Soilsorb@ etc, and any mixture thereof.
20 Non limiting examples of Polyethylene glycols varying in molecular weight grades of
PEG are polymers like PEG-200, PEG-300, PEG-400, PEG-600, PEG-1000, PEG-1500,
PEG-2000, PEG-4000 PEG-6000 etc, and any mixture thereof.
In one embodiment, along with the oxidizing agent and the jellyfying polymer, the
oxidizing composition also contains one or more stabilizers. Non-limiting examples of
25 stabilizers are Disodium phosphate, Acetaminophen, Hydroxyquinoline sulfate, Salicylic
acid, Editronic acid, Tetrasodium iminodisuccinate and Phenacetin.
According to one embodiment, said oxidizing composition is a cosmetic composition.
According to one embodiment, said oxidizing composition is selected from the group of
formulations consisting of aqueous gels, aqueous dispersions, emulsions (ON or WIO),
30 including multiple-emulsions, anhydrous Silicone or non-silicone based gels. The most
preferable formulation for the oxidizing composition is an aqueous gel. Advantageously,
an aqueous gel facilitates easy mixing with activating composition and make sure drying
of said oxidizing composition and activating composition after application time.
According to one embodiment, suitable aqueous gels contain from about 0.1 to 99%
water but preferably between 70 to 80 % and from about 1-99.9% of other cosmetic
ingredients preferably between 20 to 30 %.
In one embodiment, the oxidizing composition comprises water, PVA, hydrogen
5 peroxide, one or more optional acidifiers, such as for example phosphoric acid, and one or
more optional stabilizer, such as for example a phosphate, for example sodium
phosphate.
In one embodiment, the oxidizing composition comprises from 70 to 80 % by weight
water, from 5 to 30 % by weight of PVA, from 1 to 20 % by weight of hydrogen peroxide,
10, from 0.01 to 10 % by weight of one or more optional acidifiers, such as for example
phosphoric acid, and from 0.001 to 10 % by weight of one or more optional stabilizer, such
as for example a phosphate, for example sodium phosphate.
Activatinu com~osition:
15 The activating composition comprises at least one alkali agent. Said alkali agent has
preferably the ability to de-compose oxidizing agent present in said oxidizing composition.
This alkali agent is further referred to as "Activator" according to the present invention.
According to one preferred embodiment, said activator is an alkali agent having
moderate base strength.
20 The moderate base strength refers in particular to alkali agent having pKb value
from 2 to 5. One example of such activator is ammonia and alkylamines and derivatives
thereof such as for example alkanolamines. According to one preferred embodiment, said
activator is selected from the group consisting of alkylamines, alkanolamines, and any
mixture thereof. Alkylamines and alkanolamines may be for example linear or branched,
25 saturated or unsaturated, chains containing from 2 to please complete carbon atoms.
Such chains may be substituted by one or more chemical functions or chemical groups. In
a preferred embodiment, said activator is selected from the group consisting of
ethylamine, ethanolamine, including mono-, di- and tri-ethylamine, mono-, di- and triethanolamines.
In a preferred embodiment, said activator is selected from the group
30 consisting of ettianolamines and even more preferably is Monoethanolamine (MEA) or
triethanolamine (TEA), and any mixture thereof. In one embodiment, the concentration of
activator compound can range from 0.1-30 %; more preferably from 1 - 15 %; even more
preferably from 1 - 10%. In general, the concentration of activator depends on its basic
strength.
According to one embodiment, the pH of the activating composition ranges from 7 to
14 and preferably from 8 to 11 and even more preferably from 8 to 10.
In preferred embodiment, the activating composition comprises one or more water
soluble polymers, notably for example for thickening the composition texture. The water
5 soluble polymers can be chosen from natural or synthetic origin. Non limiting examples of
natural water soluble polymers are vegetable starches, casein, gelatin and any mixture
thereof. The some examples of synthetic water soluble polymer but not limited to are
Polyacrylamides, Polyvinyl alcohol, Polyactylic acid, Polyamines Polyethylenmines,
Polyvinylpyrrolidone/copolymers, Polyethylene glycols, Methylcellulose/derivatives,
10 Quaternaty ammonium, Carboxymethyl cellulose, Xanthan, Pectin, Guar gum derivatives,
Carboxypolymethylene and any mixture thereof. In one embodiment, the invention relates
to any mixture of said natural or synthetic water soluble polymers.
Preferred water soluble polymers are carbomers because of their gelling properties
at higher pH. Carbopol polymers are high molecular weight homo- and copolymers of acrylic acid
15 crosslinked with a polyalkenyl polyether. Non limiting examples of various carbomers
commercially available are Carbomer 940, Carbomer 980, carbomer 941, carbomer 981
from Ashland and Carbopol 940, Carbopol 934, Carobopol 980, Carbopol 981, from
Lubrizol.
In general, the concentration of water soluble polymer in composition depends on
20 thickening properties of the thickening agent. In one embodiment, the concentration of
thickening agent ranges from 0.1 to 10 %, more preferably 0.5 to 5 %, even more
preferably 1 to 4 %.
In one embodiment, the activating composition is liquid.
In one embodiment, the activating composition is a gel.
25 According to one embodiment, suitable aqueous activating composition contains
from about 0.1 to 99% water but preferably between 70 to 99% and from about 1-99.9% of
other cosmetic ingredients preferably between 80 to 90 %.
In one embodiment, in addition to activator and water soluble polymer, the activating
composition further comprises at least one skin care agent. In one embodiment, the skin
30 care agent is selected from the group consisting of: humectants, moisturizers, whitening
agents, anti-oxidants, cleansing agents, free radical scavengers, skin tone altering agents,
anti-acne agents, anti-pimple agents, anti-aging agents, anti-wrinkle agents, antiinflammatory
agents, soothing agents, skin texture treatment agents, anti-perspirant
agents, anti-bacterial agents, nourishing agents, sebum and/or moisture absorbers, and
35 any combination thereof.
In one embodiment, the compositions of the kit according to the invention further
comprise at least one physiologically acceptable excipient. In one embodiment, the
physiologically acceptable excipient is selected from the group consisting of: oils,
surfactants, structuring agents, sunscreen filters, preservatives, acidifying andlor
5 alkalizing agents, buffering agents, chelating agents, coloring additives, and any
combination thereof.
According to a specific embodiment, said the oxidizing composition comprises
hydrogen peroxide and PVA, and is preferably a gel; and the activating composition
comprises ethanolamine (preferably Mono ethanol amine, Tri-ethanol amine or a mixture
10 thereof).
Advantageously, said oxidizing composition and activating composition are mixed
together in a ratio safe in terms of skin tolerance.
For example the weight ratio between said oxidizing composition and said activating
composition is from 5050 to 80:20, preferably from 55:45 to 70:30, for example of 60:40
15 or 65:35.
In one specific embodiment, the activating composition comprises water,
ethanolamine, a water soluble polymer, such as for example a carbomer, for example
Ashland 980 carbomer (CAS number: 9003-01-04).
In one specific embodiment, the activating composition comprises from 50 to 80% by
20 weight water, from 0.5 to 10 % by weight of ethanolamine, from 0.01 to 10% by weight of
water soluble polymer, such as for example a carbomer, for example Ashland 980
carbomer.
Solid substrate:
25 The kit in this invention also comprises a solid substrate. The substrate is
advantageously water insoluble. 'Water insoluble" is defined herein as a substrate that
does not dissolve in or readily break apart upon immersion in water.
According to one embodiment, the substrate is dry. Dry substrate here means that it
does not contain any liquid apart from naturally moisture retained in it.
30 According to one embodiment, the substrate is wet.Wet substrate here means that it
contains liquid in addition to naturally moisture retained it. Such additional liquid is
typically provided by applying liquid on the substrate.
Examples of suitable water insoluble substrates include, but are not limited to, nonwoven
substrates, woven substrates, knitted substrates, polymeric meshes; etc.
In a preferred embodiment, the solid substrate is a non-woven substrate. Non-woven
substrates are the most suitable substrates since they are economical and readily
available in a wide variety of materials. "Non-woven" is defined herein notably as a
substrate or a layer of substrate, that is composed of fibers that are not woven into a
5 fabric but rather are formed into a sheet, mat or pad layer. According to one embodiment,
fibers are randomly aligned. According to one embodiment, fibers are aligned primarily in
one direction by a carding machine. Methods of making non-woven substrates are also
well known in the art. Such methods include but are not limited to, air-laying, water-laying,
melt blowing, spun bonding or carding processes. According to one embodiment, the
10 resulting substrate regardless of its method of production or composition, is subjected to
one or several types of bonding operations, such as hydro-entanglement, needle
punching, thermal bonding, and any combination of these processes. According to one
embodiment, the substrate presents a single layer. According to one embodiment, the
substrate presents to multiple layers. According to one embodiment, a multi-layered
15 substrate includes film layers such as porous or non-porous film layers andlor other nonfibrous
materials.
In a preferred embodiment, the solid substrate has a porosity allowing the mixture to
get dry in a desired application time, preferably in 15-20 minutes.
Porous is defined herein notably as a substrate permeable to liquid, typically water,
20 and air.
According to one embodiment, the substrate comprises natural , fibers, synthetic
fibers or any mixture thereof. According to one embodiment, the synthetic fiber is selected
from the group consisting of Polyester, Polyolefin (notably Polypropylene, Polyethylene,
and any combination thereof), polyamide (Nylon 6, Nylon66, and any combination
25 thereof), Viscose, acrylic, modacrylic, polyvinylindene chloride, polyurethane and
derivatives thereof such as for example spandex, and any combination thereof. According
to one embodiment, the natural fiber is selected from the group consisting of cellulosic
fibers (such as wood pulp, cotton, hemp, jute, flax fibers and any combination thereof),
silk, keratin (such as wool fibers, camel hair fibers and any combination thereof) and any
30 combination thereof.
The texture of the surface of said solid substrate is not limited. In one embodiment,
the surface texture of said solid substrate is selected from the group consisting of plain,
aperture (mesh), wavy, dotted, zig-zag line, pattern in different size and shapes.
In a preferred embodiment, said solid substrate is in the shape of the desired
35 application area. For example, if the solid substrate has to be applied on at least one area
of the skin of a user. It can be for example applied on a member of the user such as an
arm or a leg, or preferably, the skin on the face of the user.
In one embodiment, solid substrate is a face mask capable of defining at least one
central through opening, intended to receive a nose of the user, and at least two upper
5 through openings for placing in front of the eyes of the user.
In a particular embodiment, the solid substrate is a face mask. In one embodiment,
the solid substrate has a rounded shape, for example a circular or oval shape. In one
embodiment, the solid substrate has a polygonal shape.
Advantageously, said solid substrate comprises at least two through openings
10 intended to be placed facing the eyes of a user, and another through opening intended to
be placed facing the mouth of a user. In a particular embodiment, the face mask may also
comprise a slit delimiting a flapper intended to be pushed away by the nose of the user, to
delimit a nose insertion through opening. In a variant, the slit delimits a through opening
without flapper.
15 In a particular embodiment, the solid substrate is deformable to the touch, to adapt
to the conformation of the body surface.
The size and shape of the substrate depends on the application area. For example,
a solid substrate adapted to fit the face of a user may have a surface area ranging from
0.25 cm2 to 500 cm2, preferably from 200 cm2 to 450 cm2. The solid substrate typically has
20 a density of 30 glm2 to 400 glm2, preferably 40 glm2 to 80 g/m2.
In one embodiment, the solid substrate is porous. Typically, the substrate is porous
because of its construction. For example, non-woven substrate has porosity because of
pores among the fibers. In another embodiment of the invention substrate has aperture
surface. Aperture surface here means that the substrate has many small through holes.
25 For example, a non-woven substrate can be a mesh comprising 10, 18, 22 or 24 through
holes per inch square of substrate.
Method of use
The invention also relates to a method of cosmetic treatment for whitening or
30 lightening a keratinic material, wherein said treatment comprises mixing said oxidizing
composition and said activating composition to form a mixture, said mixture being applied
on a keratinic material, said solid substrate is applied on the mixture, and the mixture and
the solid substrates are removed from the keratinic material.
In one embodiment, the user mixes the oxidizing composition and the activating
35 composition to form a substantially homogeneous composition. For example the user can
mix these compositions in a bowl. The resulting mixture of the oxidizing composition and
the activating composition is referred to in the present invention as the "mixture".
In one embodiment, the oxidizing composition and the activating composition are
applied individually on essentially the same skin area and then mixed together on the skin.
5 In one preferred embodiment, the mixture is applied on a skin surface area, for
example on the face. In one embodiment, after application of the mixture on the skin, said
solid substrate is applied on said skin surface area for a ceriain period of time. In this
embodiment, the solid substrate covers at least in part, and preferably totally, the skin
surface area on which the mixture has been applied. In one embodiment, the solid
10 substrate is applied on the mixture which is placed on the skin. In another embodiment,
the mixture is applied on the solid substrate which is then applied on a skin area.
In one embodiment, the solid substrate presents a porous texture allowing the
mixture of the oxidizing and activating compositions to get dry in a specific application
time. In such a case, the solid substrate allows the mixture of the oxidizing and activating
15 compositions to go into pores of the substrate, being into contact with the atmosphere and
thereby being dried after a certain time period. The user may remove the solid substrate
together with the dry mixture. The dry mixture is adhered to the dry solid substrate,
therefore the whole is peeled off easily from the keranitic material such as for example
from skin.
20 In another embodiment, the solid substrate is impregnated with water or any other
cosmetic formulation before application on skin (on the mixture). In such a case when
user remove said solid substrate after a specific application time, the mixture of the
oxidizing composition and of the activating composition still remains on skin surface in wet
state. In this case, preferable solid substrates can be any substrate without porous
25 texture.
Typically, the specific application time can be 1 minute to 60 minutes, more
preferably 10 to 30 minutes and even more preferably 12 to 20 minutes.
In one embodiment, the specific application time is sufficient to get the mixture dry.
In one embodiment, the specific application time is sufficient to get the mixture form
30 a film, when the oxidizing composition comprises a film forming agent.
Packaaina:
The invention also relates to a packaging comprising a kit as defined in the present
invention.
In one embodiment, the oxidizing composition, the activating composition and the
solid substrate are packed separately individually. In one embodiment, these three
elements can be individually packed in separate packagings, each put in the same
container, pouch or equivalent thereof. In a variant, said three separate pakagings are put
5 in separate parts or areas of a single container, pouch or equivalent thereof. In another
embodiment, two of the three packagings are put in the same container, pouch or
equivalent thereof and the third packaging is put in another container, pouch or equivalent
thereof. For example, the oxidizing composition and the activating composition are packed
individually and put in a same first container, pouch or equivalent thereof, and the solid
10 substrate is packaged and/or put in second container, pouch or equivalent thereof.
In a variant, said separate packagings are put in separate parts or areas of a single
container, pouch or an equivalent thereof.
In one embodiment, the oxidizing composition, the activating composition and the
solid substrate are packed in individual compartments of a single packaging. Such
15 packaging can be for example a multi-compartment sachet, each compartment comprising
an element of the kit according to the invention. In one embodiment, said compartment
may comprise several units of one element of the kit according to the invention.
In one specific embodiment, the kit according to the invention is a multi-compartment
sachet comprising at least three compartments, wherein a first compartment comprises
20 the oxidizing composition, a second compartment comprises the activating composition
and a third compartment comprises the solid substrate. In one embodiment, the third
compartment comprising the solid substrate presents the biggest volume. In one
embodiment, the first compartment comprising the oxidizing composition and the second
compartment comprising the activating composition present essentially the same volume.
25 In one embodiment, the third compartment comprising the solid substrate is adjacent
to said first and second compartments and said first and second compartments are
adjacent each other.
In one embodiment each compartment of the multi-compartment sachet comprises a
predefined cutting line made on andlor in the compartment wall, allowing easy cutting of
30 the compartment wall by a user in order to withdraw the elements of the kit contained in
the compartments.
In yet another embodiment of this invention, the multi compartment of sachet can
have manually breakable wall or boundary between two compartments.
In one specific embodiment, and said first and second compartments are adjacent
35 each other and the separating wall between the first and second compartments is a
breakable wall. Said breakable wall allows advantageously contacting and mixing said
oxidizing and activating compositions inside the sachet. According to such an
embodiment, the mixture of said oxidizing and activating compositions can be withdrawn
from a single opening made in the first andlor second compartments walls.
5 In another embodiment of invention, the kit is comprises one or more other
compositions for completing the cosmetic treatment.
For example, for a face care product, a pre-treatment product before the use of kit
can be used and/or a post treatment product can be used after using the kit according to
the invention. Therefore, according to one embodiment, said kit comprises a composition
10 for pre-treating the keratinic material prior to application of the mixture on said keratinic
material andlor a composition for post-treating the keratinic material after application of
the mixture on said keratinic material.
One example of such pretreatment product for face is a moisturizing product.
One example of such post treatment product is a (after or pre-) sun-care product.
15 According to the present invention, the terms "a", "an", "the" mean "one or more"
unless expressly specified otherwise.
.Examples of such packaging are shown in Figures:
Figure 1 schematically illustrates a packaging 10 having three compartments (1, 2,
20 3) comprising respectively the oxidizing composition, the activating composition and the
solid substrate. In this embodiment, the user needs to take out the two compositions and
mix them for example in a bowl.
Figure 2 schematically illustrates a packaging 20 having three compartments (1, 2,
3) comprising respectively the oxidizing composition, the activating composition and the
25 solid substrate, said packaging 20 comprising a breakable wall or boundary 4 between
compartments 1 and 2. The user can break this wall or boundary 4 by applying a pressure
on this wall or boundary 4 just before use of the kit and mix of the two compositions in the
packaging itself.
Figure 3 schematically illustrates a solid substrate 16 cut or shaped into the form of
30 a face mask.
Figure 4 shows the efficacy of kits according to the present invention.
Examples
Example 1:
One example of the invention, but not limited to, relates to use of the kit on face. The
solid substrate is cut or shaped into a face mask to be used for instant whitening of the
5 face.
An example of oxidizing composition is shown in Table 1 and example of activating
composition wherein Triethanolamine was used as activator is shown here in Table 2.
Table 1: Oxidizing composition
lngredient
Water 72.85
I
Poly Vinyl alcohol
I
15
Hydrogen peroxide (50% Conc.)
Tetra sodium phosphate
I I
Weight percent is given relative to the weight of the final composition
11.5
0.15
I
Table 2: Activating composition
I Ingredient I %
Phosphoric acid 0.5
Carbomer 1 0.5
Water
Butylene Glycol
69.5
5
(Acrylic acid homopolymer)
Triethanolamine 25
In this example, the recommended weight ratio between the oxidizing composition
and the activating composition for user's skin is 60:40. Therefore, the final composition of
mixture after mixing these two compositions of table 1 and 2 is shown in Table 3.
5 Table 3: Mixture composition
I Ingredient I %
Water
Poly Vinyl alcohol
74.96
9
Hydrogen peroxide
Tetra sodium phosphate
3.450
0.09
Phosphoric acid
Butylene Glycol
(Acrylic acid homopolymer)
Triethanolamine 110
0.3
2
Carbomer
The solid substrate is composed of 100 % Viscose fiber having a porous texture.
Said solid substrate presents a porosity of 16 mesh and a density of 50 gramslmete?.
0.2
10 In one preferred embodiment, the solid substrate is cut or shaped into a face mask.
In figure 3, the substrate 16 presents pores 19 and is in the shape of a face mask 14. This
mask comprises at least two through opening 15 intended to be placed facing the eyes of
user, and another through opening 18 is intended to be placed facing the mouth of user.
The mask also comprises a flapper 17, intended to be placed over nose of user.
15 The user of the kit mentioned in example 1 first applied the mixture of compositions
of Table 3 on the face and then placed the solid substrate in the form of a face mask on
face over the mixture. The application time was 15 minutes, after 15 minutes, the mask
was removed from the face.
Example 2
Another example of activating composition, wherein Monoethanolamine was used as
activator is shown here in Table 4.
5 Table 4: Activator composition with MEA
I Ingredient I % I
,
Butylene Glycol 15
- I
Water
In this example, the recommended weight ratio between the oxidizing composition
and the activating composition is 6335. Therefore, the final composition of the mixture
91.25
Carbomer (Acrylic acid homopolymer)
Monoethanolamine
15 after mixing compositions of Table 1 and Table 4 was as shown in Table 5.
0.5
10
3.25
Table 5: Mixture composition 2
I Ingredient 1 % I
Water
Poly Vinyl alcohol
Hydrogen peroxide
Tetra sodium phosphate
I
Carbomer 1 0.175
83.028
9.750
3.738
0,098
Phosphoric acid 0.325
The user of the kit mentioned in example 2 first applied the mixture according to
Butylene Glycol 1 1.75
I
20 Table 5 on the face and then placed the mask described in example 1 on its face over the
Monoethanolamine
mixture. The application time was 15 minutes, after 15 minutes, the mask was removed
1.138
from the face.
Efficacy of the kit mentioned in Example 1 and Example 2 was evaluated on 16
users. The L value (whiteness) of users' face was measured using spectrophotometer
according to standard practice 10 minutes after removal of the mask and then after 1
hour, 4 hour. 1 day, 3 day and 14'~d ay.
The results are shown in Figure 4. The figure clearly shows that for both examples,
the value obtained after 10 minutes of use of the kit according to the invention (T-1OMin)
5 is significantly higher than the baseline and remains significantly higher up to 14 days.
This proves the efficacy of the kit according to the present invention.
Also, the composition of example 2 shows a higher increase in L value than the
composition of example 1.
The feedback of 16 users of the kit was taken and it was found that most of the
10 users felt skin was lighten after application and was lighten for 14 days, and use of kit of
example 2 was more effective. Users also perceived that use of kit of this invention was
more comfortable and more convenient to use in compare to state of the art oxidizing skin
lightening products.
CLAIMS
1. A kit for lightening or whitening a keratinic material, preferably skin body surface,
5 said kit comprising at least three separate elements:
- an oxidizing composition, said composition comprising at least one oxidizing agent
and at least one jellifying polymer;
- an activating composition comprising at least one alkali agent decomposing the
oxidizing agent of said oxidizing composition; and
10 - a solid substrate.
2. Kit according to claim 1, wherein said oxidizing agent is selected from the group
consisting of hydrogen peroxide, inorganic peroxides, hypochlprites,
permanganate compounds, sodium perborate, ammonium perborate, and any
15 mixture thereof.
3. Kit according to claim 1 or 2, wherein said jellifying polymer is a film forming agent.
4. Kit according to any one of claims 1 to 3, wherein jellifying polymer or film forming
20 polymer is selected from the group consisting of vegetable starches, polyvinyl
alcohol (PVA), polyvinylpyrrolidone copolymers (PVP) cellulose and its derivatives
such as methylcellulose derivatives, quaternary ammonium cellulose, and any
mixture thereof.
25 5. Kit according to any one of claims 1 to 4, wherein said activating composition
comprises an alkali agent having a pKb value from 2 to 5.
6. Kit according to any one of claims 1 to 5, wherein said liquid activator composition
comprises at least one alkylamine, alkanolamine, and any mixture thereof.
30
7. Kit according to any one of claims 1 to 6, wherein said activating composition
comprises one or more water soluble polymers substrate.
8. Kit according to any one of claims 1 to 7, wherein said solid substrate is wet.
35
9. I