Description:
FIELD OF INVENTION
The present invention relates to the field of rinse-off cosmetic products. The present invention especially relates to the development of rinse-off cosmetic products having the effect of skin hydration and moisturization.

BACKGROUND OF THE INVENTION
Skin is the largest organ of the body. The skin's primary role is to shield the body from external threats and prevent excessive water loss. This protective function is largely attributed to the skin barrier, a critical structure within the stratum corneum – the skin's outermost layer. The stratum corneum consists of corneocytes (specialized skin cells formed during keratinocyte differentiation) embedded in a matrix of complex lipids. The skin represents the most superficial layer of the body and it is constantly exposed to different environmental stimuli. The skin's appearance and function depend on a delicate balance between the water content of the stratum corneum and the lipids on the skin's surface. Skin’s outermost layer consists of natural moisturizing factors (NMF), which is a group of hygroscopic molecules that is naturally present in skin and prevents from severe drying.

Seok-Young Kang et al. in Medicina 2022, 58(7), 888, https://doi.org/10.3390/medicina58070888, reported role of moisturizers as adjuvant in treatment of common skin diseases, such as atopic dermatitis, contact dermatitis, psoriasis, acne and rosacea. Moisturizers not only improve dryness but also improve the skin’s natural barrier function to protect the skin from internal and external irritants to keep the skin healthy. The literature discloses various ingredients, like occlusive agents, emollients, humectants, lipid mixture, emulsifiers, and preservatives, as components of moisturizing compositions as provided in Table 1:

Table 1: Components of moisturizing compositions

The literature discloses the specificity of moisturizing composition according to the disease need to be treated. Choosing a right moisturizer for a user depends on the condition of the skin of the user. Basic cosmetics, especially moisturizers, should be recommended in consideration of the ingredients, effectiveness and safety of each product, and the skin condition of each patient. Accordingly, a synergistic composition comprising ceramide, cholesterol and free fatty acids at a mixing ratio of 3:1:1, provided at a concentration of 1–2% or more, which was approved by the US FDA for improving the symptoms of atopic dermatitis.

Boury-Jamot M et al in Handb Exp Pharmacol 2009;190:205-17, revealed that the water transporting proteins located in the cell wall known as aquaporins plays a major role in maintaining the water level in the skin. Topical application of products on the skin establishes several new gradients across the skin membrane; this treatment may also alter the properties of skin barrier. Understanding of these chemical or physical changes in the skin barrier therefore becomes highly important. Constant exposure to exogenous substances and certain endogenous factors disrupts this balance. The anatomy of the skin also exhibits significant regional variation, which is influenced by its location, for example cheek area demonstrates the transepidermal water loss (TEWL) as lowest, whereas the perioral region exhibits the highest TEWL. Additionally, the vermilion zone around the lips is characterized by suboptimal hydration and a compromised barrier function [Tagami H., “Location-related differences in structure and function of the stratum corneum with special emphasis on those of the facial skin”. Int J Cosmet Sci 2008;30:413—34].

In addition to this, frequent use of cosmeceutical products like face wash leads to disrupting such balance. Face washes contain chemical substances which lead to loss of TEWL and stripping the skin of its natural oil. Loss of water and disruption of skin barrier leads to various common problems like flaky skin, cracks, itching & stinging sensation. Hence, treatment with moisturizers becomes necessary [Rhein LD, Robbins CR, Kernee K, Cantore R. “Surfactant structure effects on swelling of isolated human stratum corneum”, J Soc Cosmet Chem 1986: 37: 125–139; Wihelm KP, Wolff HH, Maibach HI, “Effects of surfactants on skin hydration”, in, Elsner P, Berardesca E, Maibach HI, eds. Bioengineering of the Skin: Water and the Stratum Corneum. Boca Raton, FL: CRC Press, 1994: 257–274; and Imokawa G, Sumura K, Katsumi M, “Study on skin roughness caused by surfactants. II. Correlation between protein denaturation and skin roughness”, J Am Oil Chem Soc 1975: 52: 484–489].

US11839679 discloses gamma-diketones based cosmetic or dermo-pharmaceutical compositions for treatment and prevention of aging skin and wrinkles. The composition comprises a laundry list of preservatives, skin-identical/repairing agents, fragrances extracts, slip agents, absorbents, emulsifiers, surfactants, detergents, emollients, film-forming/holding agents, antioxidants, thickeners and many other compounds.

Teresa M. Weber et al in Journal of Clinical and Aesthetic Dermatology 5(8):29-39, reported treatment of xerosis with a topical formulation containing glyceryl glucoside, natural moisturizing factors, and ceramide. The authors reported that moisturizer products containing glyceryl glucoside promote water to the stratum corneum, ceramide 3 to strengthen the lipid barrier, and numerous components of the NMF, such as urea and others, to moisturize and help promote barrier repair. These formulations are constructed to hydrate skin by multiple mechanisms, and to promote the self-repair of the barrier.

WO2018178604A1 discloses cosmetic compositions for moisturization of skin comprising active agent, the combination of an effective amount of a skin moisturizing ingredient and of an extract of the pericarp of the Chenopodium quinoa Willd. seed, predominantly comprising compounds of saponin type.

EP2252375B1 discloses a cosmetic or dermopharmaceutical composition for topical use comprising in a physiologically acceptable medium as active ingredient: a. homarine, one of its salts and/or one of its analogs of C2-C6 N-alkyl type, preferably selected from derivatives of N-ethyl, N-propyl and N-butyl type; and b. erythritol, wherein the homarine is present in an amount from 0.00001% to 50%, preferably from 0.0001% to 30% and more preferably from 0.001% to 10% by weight with respect to the total weight of the composition; and wherein the erythritol is present in an amount from 0.00001% to 80%, preferably from 0.001% to 50% and more preferably from 0.01% to 30% by weight with respect to the total weight of the composition; and wherein the homarine and the erythritol are present in a ponderal ratio from 1:1000 to 10:1, preferably from 1:1000 to 1:1, and more preferably from 1:100 to 1:10.

A. Schrader et al in Skin Pharmacol Physiol (2012) 25 (4): 192–199. https://doi.org/10.1159/000338190, reported effects of Glyceryl Glucoside (GG) on AQP3 Expression, Barrier Function and Hydration of Human Skin. It discloses that AQP3 (most abundant aquaporin in the epidermis) rebalancing by GG [alpha-D-glucopyranosyl-alpha-(1-2)-glycerol] plays an important role in skin health by improving epidermal water supply and barrier function, thereby helping to regulate water homeostasis in viable layers of the epidermis. GG promotes AQP3 mRNA and protein upregulation and improves skin barrier function.

Cosmetic products as disclosed above comprising components known to provide moisturization and hydration, are leave-on cosmetic products, which remains on the skin after their application. However, there are not many rinse-off cosmetic product having moisturizing and hydration effect, even after rinsing off the cosmetic product from the skin.

Thus, there is need for development of rinse-off cosmetic product having moisturizing effect, which can maintaining optimal stratum corneum hydration crucial for skin health and suppleness, even after it is rinsed out.

OBJECT OF THE INVENTION
Accordingly, it is an object of the present invention to overcome drawbacks of prior art and provide a cosmetic product which can impart and maintain hydration and moisturization of the skin.

It is further an object of the present invention to provide a rinse off cosmetic product providing hydrating and moisturizing effect, even after it is rinsed off.

It is another object of the present invention to provide a system, which can impart and maintain hydration and moisturization to a cosmetic product, without affecting the quality of the cosmetic product.

It is yet another object of the present invention to provide a system, which can impart and maintain desired hydration and moisturization to a rinse-off cosmetic product, without affecting the quality of the rinse-off cosmetic product.

It is another object of the present invention to provide a method of imparting hydration to a cosmetic product.

It is yet another object of the present invention to provide a method of imparting sustained hydration to a rinse off cosmetic product. It is also an object of the present invention to provide a process for preparing a rinse off cosmetic product having a sustained hydration and moisturizing effect.

SUMMARY OF THE INVENTION
In a first aspect of the present invention there is provided a rinse-off cosmetic product having moisturizing and hydration effects, comprising a system for imparting hydration and moisturization, wherein the system includes a first blend; and a second blend; wherein the first blend and the second blend are combined at a ratio of 1:0.2.

In a second aspect there is provided a rinse-off cosmetic product having moisturizing and hydration effects, comprising:

a system for imparting hydration and moisturization, wherein the system includes:
- a first blend comprising Glycerin at an effective concentration of 55-75% wt/wt, Propanediol at an effective concentration of 0-10% wt/wt, Imidazolidinyl Urea at an effective concentration of 20-35% wt/wt, Glyceryl Glucoside at an effective concentration of 0-10% wt/wt, Sodium Pyrrolidone Carboxylic Acid at an effective concentration of 0-10% wt/wt, Butylene Glycol at an effective concentration of 0.5-5% wt/wt, Phenoxyethanol at an effective concentration of 0.5-5% wt/wt, and Ethylhexylglycerin at an effective concentration of 0.5-5% wt/wt; and
- a second blend comprising Polysorbate 20 at an effective concentration of 20-40% wt/wt, PEG-40 Hydrogenated Castor Oil at an effective concentration of 20-40% wt/wt, Tocopherol Acetate at an effective concentration of 20-40% wt/wt, and Vegetable Squalane at an effective concentration of 1-10% wt/wt;
wherein the first blend and the second blend are combined at a ratio of 1:0.2.

In a third aspect there is provided a system for imparting hydration and moisturization in a rinse-off cosmetic product, comprising:
• a first blend comprising:
Glycerin at an effective concentration of 55-75% wt/wt,
Propanediol at an effective concentration of 0-10% wt/wt,
Imidazolidinyl Urea at an effective concentration of 20-35% wt/wt,
Glyceryl Glucoside at an effective concentration of 0-10% wt/wt,
Sodium Pyrrolidone Carboxylic Acid at an effective concentration of 0-10% wt/wt,
Butylene Glycol at an effective concentration of 0.5-5% wt/wt,
Phenoxyethanol at an effective concentration of 0.5-5% wt/wt, and
Ethylhexylglycerin at an effective concentration of 0.5-5% wt/wt;
• a second blend comprising:
Polysorbate 20 at an effective concentration of 20-40% wt/wt,
PEG-40 Hydrogenated Castor Oil at an effective concentration of 20-40% wt/wt,
Tocopherol Acetate at an effective concentration of 20-40% wt/wt, and
Vegetable Squalane at an effective concentration of 1-10% wt/wt;
wherein the first blend and the second blend are combined at a ratio of 1:0.2 to impart sustained hydration and moisturization effects.

In a fourth aspect there is provided a rinse-off cosmetic product having moisturizing and hydration effects, produced by a process comprising the steps of:
- providing a system for imparting hydration and moisturization, the system comprising:
a first blend including Glycerin at an effective concentration of 55-75% wt/wt, Propanediol at an effective concentration of 0-10% wt/wt, Imidazolidinyl Urea at an effective concentration of 20-35% wt/wt, Glyceryl Glucoside at an effective concentration of 0-10% wt/wt, Sodium Pyrrolidone Carboxylic Acid at an effective concentration of 0-10% wt/wt, Butylene Glycol at an effective concentration of 0.5-5% wt/wt, Phenoxyethanol at an effective concentration of 0.5-5% wt/wt, and Ethylhexylglycerin at an effective concentration of 0.5-5% wt/wt;
a second blend including Polysorbate 20 at an effective concentration of 20-40% wt/wt, PEG-40 Hydrogenated Castor Oil at an effective concentration of 20-40% wt/wt, Tocopherol Acetate at an effective concentration of 20-40% wt/wt, and Vegetable Squalane at an effective concentration of 1-10% wt/wt;
- combining the first blend and the second blend at a ratio of 1:0.2 to form the system;
- incorporating the system into a rinse-off composition to produce the rinse-off cosmetic product.

BRIEF DESCRIPTION OF THE INVENTION
Figure 1 - Hydration mechanism of Humectant, Emollient & Occludent/occlusive agents (Prior Art) - figure shows the mechanism of hydration & moisturization of humectant, emollient & occludents/occlusive agents.

Figure 2 - Hydration Study Results of syndet based face wash (Belongs to this invention) - figure is a graphical representation of hydration study done through corneometer of marketed syndet based face washes, study shows that application of marketed facewashes is known to dehydrate the skin.

Figure 3 - Hydration Study Results of soap-based face wash (Belongs to this invention) - figure is a graphical representation of hydration study done through corneometer of marketed soap based face washes, study shows that application of marketed facewashes is known to dehydrate the skin.

Figure 4 - Hydration Study Results of control sample vs control sample + blends (Belongs to this invention) - figure is a graphical representation of hydration study done through a corneometer to showcase the efficacy of hydration of blends.

Figure 5 - Hydration Results which proves the synergistic behaviour of current invention (Belongs to this invention) - figure is a graphical representation of hydration study done through a corneometer to prove the synergistic behaviour of blends.

DETAIED DESCRIPTION OF THE INVENTION
The present invention is directed to development of a cosmetic product, particularly a rinse-off cosmetic product.

The following detailed description of the invention is provided to aid those skilled in the art in practicing the present invention. Even so, the detailed description should not be construed to unduly limit the present invention as modifications and verifications in the embodiments discussed herein may be made by those of skill in the art with the help of the foregoing description and accompanying figures without departing from the spirit or scope of the present inventive discovery.

The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary.

Accordingly, those skilled in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions may be omitted for clarity and conciseness.

It is to be understood that the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

The terminology used herein is for the purpose of describing particular various embodiments only and is not intended to be limiting to various embodiments. It will be further understood that the terms "comprises" and/or "comprising" used herein specify the presence of stated features, integers, steps, operations, members, components, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, members, components, and/or groups thereof. Also, expressions such as "at least one of," when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list.

Described herein is a rinse-off cosmetic product, a system and a process designed to provide sustained hydration and moisturization effects, even after the product is rinsed off. This invention is particularly beneficial for maintaining optimal stratum corneum hydration, which is crucial for skin health and suppleness. Below are detailed descriptions of the invention in the form of different embodiments.

Said rinse-off product is a personal care product is designed to be washed off or rinsed off with water after use, rather than being left on the skin or hair. Rinse-off products are primarily used for cleansing purposes, for removing dirt, oil, and other impurities from the skin or hair. The rinse off cosmetic product can be formulated as a face wash, body wash, cleanser, shampoo or conditioner providing hydration and moisturization effects while cleansing the skin.

The most effective criteria of selecting a rinse off cosmetic product is its cleaning efficiency, which is often decided by users with the amount of foaming, and thus foaming is one of the critical cost factors of such formulation. An ideal rinse-off cosmetic product balances foam lather with the ability to cleanse gently, providing a luxurious experience without compromising skin or hair health. The present invention is directed to the development of a system, which imparts and maintains hydration and moisturization, without affecting the quality of the cosmetic product.

The rinse off cosmetic product comprises a system for imparting hydration and moisturization effect in the rinse-off cosmetic product, where such effect is sustained even after rinsing off the product from the skin.

Thus, in another embodiment there is provided a system for imparting hydration and moisturization effect in a rinse-off cosmetic product.

Said system comprises a blend of hygroscopic agents, emollients, and humectants, provided in a way to deliver the hydration and moisturization effect in a rinse-off cosmetic product, such that the effect of hydration and moisturization sustains after rinsing off the product from the skin.

The system for imparting hydration and moisturizing effect in a rinse off cosmetic product, comprises a first blend and a second blend, where the first blend is a hydrating blend and the second blend is a moisturizing blend.

The system comprises a combination of a first blend (hydrating blend) and a second blend (moisturizing blend), where the first blend promotes deep hydration in the skin and the second blend mitigates transepidermal water loss (TEWL) from the skin. The first blend promotes deep hydration by attracting water molecules within superficial stratum corneum while simultaneously stimulating aquaporin activity in the epidermis, which are responsible for enhancing water flux within the skin.

The present inventors found that the combination of the first blend to the second blend is a synergistic combination of components, and when provided in suitable amounts and ratios, creates an environment conducive to epidermal repair, mitigating the effects of dryness, irritation, and various dermatological disorders. The precise balance of the components present in the blends is essential for achieving optimal moisturization and promoting overall skin health in a rinse off cosmetic product.

The rinse off cosmetic product comprising the system of the present invention comprises the combination of a first blend and a second blend at a specific ratio. Said combination of the first blend and the second blend at the specific ratio is critical for maintain the standard of a rinse-off cosmetic product. Said ratio of the first blend to the second blend is 1:0.2.

The first blend (also known as hydrating blend) comprises a blend of hydrating agents, and emollients. It particularly comprises humectants, lightweight emollients, and skin protein-stimulating agents imparting optimal skin health and comfort.

Humectants within the first blend draw moisture from the environment and deeper skin layers into the epidermis, enhancing hydration and plumping skin cells for a more youthful appearance.

The skin protein-stimulating agents within the first blend enhance the skin's natural barrier function and increase resilience.

Simultaneously, lightweight emollients present in the first blend, work to regulate trans-epidermal water loss (TEWL) without a heavy feel, for creating a semi-occlusive barrier, slowing evaporation while allowing the skin to breathe, and ensuring balanced hydration.

Furthermore, the first blend (Hydrating Blend) incorporates skin protein-stimulating agents to mitigate potential irritation from desiccating components. These agents bolster the skin's natural barrier function, increasing resilience and minimizing irritation, even from potentially drying ingredients. This makes the first blend suitable for sensitive skin, promoting comfortable and balanced hydration.

Preferably, the hydrating agents includes but are not limited to Glycerin, Propanediol, Imidazolidinyl Urea, Glyceryl Glucoside, Sodium Pyrrolidone Carboxylic Acid, Butylene Glycol, Phenoxyethanol, and Ethylhexylglycerin.

More preferably the first blend of the system in a rinse off cosmetic product, comprises glycerin at an effective concentration of 55-75% wt/wt, Propanediol at an effective concentration of 0-10% wt/wt, Imidazolidinyl Urea at an effective concentration of 20-35% wt/wt, Glyceryl Glucoside at an effective concentration of 0-10% wt/wt, Sodium Pyrrolidone Carboxylic Acid at an effective concentration of 0-10% wt/wt, Butylene Glycol at an effective concentration of 0.5-5% wt/wt, Phenoxyethanol at an effective concentration of 0.5-5% wt/wt, and Ethylhexylglycerin at an effective concentration of 0.5-5 % wt/wt.

The second blend of the system for imparting the effect of moisturization and hydration in a rinse-off cosmetic product. Said second blend is a moisturizing blend and comprises a blend of a moisturizing agent or occlusive agents with antioxidant, solubilizer and emulsifier.

Antioxidants present in the second blend (Moisturizing Blend), scavenge free radicals by interrupting radical chain reactions and prevents the formation of reactive oxidants.
Occlusive agents present in the second blend (Moisturizing Blend), work by creating a physical barrier on the skin's surface, preventing trans-epidermal water loss and maintaining optimal hydration levels.

Solubilizers present in the second blend (Moisturizing Blend), enhance the compatibility of system comprising the combination of blend in a rinse off cosmetic product to provide a clear end product.

Preferably, the second blend comprises Polysorbate 20, PEG-40 Hydrogenated Castor Oil, Tocopherol Acetate, and Vegetable Squalane.

More preferably, the second blend of the system in a rinse off cosmetic product, comprises Polysorbate 20 at an effective concentration of 20-40 % wt/wt, PEG-40 Hydrogenated Castor Oil at an effective concentration of 20-40 % wt/wt, Tocopherol Acetate at an effective concentration of 20-40% wt/wt, and Vegetable Squalane at an effective concentration of 1-10 % wt/wt.

In a preferred embodiment, the system for imparting hydration and moisturizing effect in a rinse off cosmetic product comprises:
a first blend comprising Glycerin at an effective concentration of 55-75% wt/wt, Propanediol at an effective concentration of 0-10% wt/wt, Imidazolidinyl Urea at an effective concentration of 20-35% wt/wt, Glyceryl Glucoside at an effective concentration of 0-10% wt/wt, Sodium Pyrrolidone Carboxylic Acid at an effective concentration of 0-10% wt/wt, Butylene Glycol at an effective concentration of 0.5-5% wt/wt, Phenoxyethanol at an effective concentration of 0.5-5% wt/wt, and Ethylhexylglycerin at an effective concentration of 0.5-5 % wt/wt, and
a second blend comprising Polysorbate 20 at an effective concentration of 20-40 % wt/wt, PEG-40 Hydrogenated Castor Oil at an effective concentration of 20-40 % wt/wt, Tocopherol Acetate at an effective concentration of 20-40% wt/wt, and Vegetable Squalane at an effective concentration of 1-10 % wt/wt;
wherein the first blend and the second blend are combined at a ratio of 1:0.2 to impart sustained hydration and moisturization effects.

The combination of the first blend and the second blend provides a synergistic effect that enhances epidermal repair and mitigates the effects of dryness and irritation.

The first blend attracts water molecules within the superficial stratum corneum and stimulates aquaporin activity in the epidermis, enhancing water flux within the skin. It draws moisture from the environment and deeper skin layers into the epidermis, enhancing hydration and plumping skin cells for a more youthful appearance. Lightweight emollients regulate trans-epidermal water loss (TEWL) without a heavy feel, creating a semi-occlusive barrier that slows evaporation while allowing the skin to breathe. The second blend creates a physical barrier on the skin's surface, preventing trans-epidermal water loss and maintaining optimal hydration levels. Antioxidants scavenge free radicals, interrupting radical chain reactions and preventing the formation of reactive oxidants. Solubilizers enhance the compatibility of the system with various rinse-off cosmetic formulations.

The system comprising such a combination of a first blend and a second blend is formulated to be compatible with diverse cosmetic bases, including creams and lotions.

In an embodiment, the rinse-off cosmetic product comprises a system for imparting hydration and moisturization, which includes:
a first Blend (Hydrating Blend) which includes ingredients as Glycerin, Propanediol, Imidazolidinyl Urea, Glyceryl Glucoside, Sodium Pyrrolidone Carboxylic Acid, Butylene Glycol, Phenoxyethanol, and Ethylhexylglycerin, and
a second Blend (Moisturizing Blend) which includes ingredients as Polysorbate 20, PEG-40 Hydrogenated Castor Oil, Tocopherol Acetate, and Vegetable Squalane.

The rinse-off cosmetic product comprising the system provides sustained hydration and moisturization effects even after the product is rinsed off.

The rinse off cosmetic product comprising such system is selected from face wash, cleanser, shampoo and body wash.

In a preferred embodiment there is provided a rinse off cosmetic product having moisturizing and hydration effects comprising

a first blend including Glycerin at an effective concentration of 55-75% wt/wt, Propanediol at an effective concentration of 0-10% wt/wt, Imidazolidinyl Urea at an effective concentration of 20-35% wt/wt, Glyceryl Glucoside at an effective concentration of 0-10% wt/wt, Sodium Pyrrolidone Carboxylic Acid at an effective concentration of 0-10% wt/wt, Butylene Glycol at an effective concentration of 0.5-5% wt/wt, Phenoxyethanol at an effective concentration of 0.5-5% wt/wt, and Ethylhexylglycerin at an effective concentration of 0.5-5 % wt/wt; and
a second blend including Polysorbate 20 at an effective concentration of 20-40 % wt/wt, PEG-40 Hydrogenated Castor Oil at an effective concentration of 20-40 % wt/wt, Tocopherol Acetate at an effective concentration of 20-40% wt/wt, and Vegetable Squalane at an effective concentration of 1-10 % wt/wt; and
wherein the first blend and the second blend are combined at a ratio of 1:0.2.

In a preferred embodiment the rinse-off cosmetic product is a face wash formulation and a system for imparting hydration and moisturizing effect is incorporated into a face wash formulation.

More preferably, there is provided a face wash formulation having a system for imparting hydration and moisturizing effect
where, the system comprises a first blend as hydrating blend and a second blend as a moisturizing blend,
the hydrating blend comprises Glycerin at an effective amount of 65.72 % w/w, Propanediol at an effective amount of 14.29 % w/w, Imidazolidinyl Urea at an effective amount of 7.14 % w/w, Glyceryl Glucoside at an effective amount of 2.85 % w/w, Sodium Pyrrolidone Carboxylic Acid at an effective amount of 5.71 % w/w, Butylene Glycol at an effective amount of 2.86 % w/w, Phenoxyethanol at an effective amount of 1.29 % w/w, and Ethylhexylglycerin at an effective amount of 0.14 % w/w; the moisturizing blend comprises Polysorbate 20 at an effective amount of 32 % w/w, PEG-40 Hydrogenated Castor Oil at an effective amount of 32 % w/w, Tocopherol Acetate at an effective amount of 32 % w/w, and Vegetable Squalane at an effective amount of 4% w/w. The hydrating blend and the moisturizing blend in the face wash are combined at a ratio of 1:0.2.

In a preferred embodiment the rinse-off cosmetic product is a body wash formulation and a system for imparting hydration and moisturizing effect is incorporated into a body wash formulation.

In a preferred embodiment the rinse-off cosmetic product is a cleanser formulation, and a system for imparting hydration and moisturizing effect is incorporated into a cleanser formulation.

In a preferred embodiment the rinse-off cosmetic product is a shampoo formulation, and a system for imparting hydration and moisturizing effect is incorporated into the shampoo formulation.

In another embodiment, the present invention provides a process for preparing the rinse-off cosmetic product. Said process comprises the steps of:
1. Providing the System:
a. The system for imparting hydration and moisturization is prepared by combining the first blend and the second blend at a specific ratio of 1:0.2.
2. Incorporating the System:
a. The system is then incorporated into a rinse-off composition to produce the rinse-off cosmetic product. This process ensures that the hydration and moisturization effects are sustained even after rinsing.

The process is advantageous as it allows for the incorporation of the system at ambient temperature, eliminating the need for external heating and preserving the stability of active ingredients.

The rinse off cosmetic product as obtained by the process comprises a blend of moisturizing agent, provided at a specific blend with the components and at a specific ratio. The moisturizing blend's efficacy is critically dependent on the optimal proportions of occlusives, humectants, and emollients present in the blend.

The present system provides a combination of the first and second blend that creates a synergistic effect that enhances epidermal repair and mitigates the effects of dryness, irritation, and various dermatological disorders. The precise balance of components is essential for achieving optimal moisturization and promoting overall skin health. The system provides long-lasting hydration benefits, even after rinsing, which is a significant advancement over conventional rinse-off products. The synergistic action of the blend's components promotes superior cutaneous hydration and moisturization, improving skin health and comfort.

Thus, in an embodiment a rinse-off cosmetic product having moisturizing and hydration effects is produced by a process comprising the steps of:
providing a system for imparting hydration and moisturization, the system comprising:
a first blend including Glycerin at an effective concentration of 55-75% wt/wt, Propanediol at an effective concentration of 0-10% wt/wt, Imidazolidinyl Urea at an effective concentration of 20-35% wt/wt, Glyceryl Glucoside at an effective concentration of 0-10% wt/wt, Sodium Pyrrolidone Carboxylic Acid at an effective concentration of 0-10% wt/wt, Butylene Glycol at an effective concentration of 0.5-5% wt/wt, Phenoxyethanol at an effective concentration of 0.5-5% wt/wt, and Ethylhexylglycerin at an effective concentration of 0.5-5% wt/wt;
a second blend including Polysorbate 20 at an effective concentration of 20-40% wt/wt, PEG-40 Hydrogenated Castor Oil at an effective concentration of 20-40% wt/wt, Tocopherol Acetate at an effective concentration of 20-40% wt/wt, and Vegetable Squalane at an effective concentration of 1-10% wt/wt;
combining the first blend and the second blend at a ratio of 1:0.2 to form the system; incorporating the system into a rinse-off composition to produce the rinse-off cosmetic product.

The present invention provides an evaluation of rinse off cosmetic products comprising the system for imparting hydration and moisturizing effect based on consumer’s analysis on evaluation parameters, demonstrating favorable sensory attributes and overall satisfaction. Participants reported enhanced post-use sensory characteristics and improved foaming performance.

The product's efficacy was assessed through evaluation parameters such as hydration studies, pH analysis, viscosity analysis, foamability analysis, and consumer evaluations. These studies confirmed the product's ability to provide sustained hydration and moisturization effects.

Further embodiments of the present invention is illustrated in following Examples.

Raw Materials: Marketed gel based neem Face wash – 1, Marketed gel based foaming Face wash – 2, Marketed Soap based niacinamide Face wash – 1, Marketed Soap based activated charcoal Face wash – 2. Marketed products were purchased from local shops. Placebo/Control, Glycerin (Godrej), Propanediol (DuPont), Imidazolidinyl Urea (Shandong Ailitong New Material Co. Ltd), Glyceryl Glucoside (BASF), Sodium Pyrrolidone Carboxylic Acid (Reachin), Butylene Glycol (Godavari Biorefineries), Phenoxyethanol (Amvigor), Ethylhexylglycerin (Amvigor), Polysorbate 20 (Mohini Organics), PEG-40 Hydrogenated Castor Oil (Mohini Organics), Tocopherol Acetate (BASF), and Vegetable Squalane (SOPHIM).

Example 1: Preparation of First Blend
Two blends were prepared comprising Glycerin, Propanediol, Imidazolidinyl Urea, Glyceryl Glucoside, Sodium Pyrrolidone Carboxylic Acid, Butylene Glycol, Phenoxyethanol, and Ethylhexylglycerin, as (a) Blend 1 and (b) Trial Blend 1.

Preparation of (a) Blend 1 involves mixing the components Glycerin, Propanediol, Imidazolidinyl Urea, Glyceryl Glucoside, Sodium Pyrrolidone Carboxylic Acid, Butylene Glycol, Phenoxyethanol, and Ethylhexylglycerin according to the amounts specified in Table 2:

Table 2: Designs of Blend 1
Blend 1 (Hydrating Blend)

Sr No. Ingredient Conc (in % w/w)
1 Glycerin 55-75
2 Propanediol 10-20
3 Imidazolidinyl Urea 5-18
4 Glyceryl Glucoside 2-10
5 Sodium Pyrrolidone Carboxylic Acid 2-10
6 Butylene Glycol 0.5-5
7 Phenoxyethanol 0.5-5
8 Ethylhexylglycerin 0.5-5

More specifically the concentration of the components in the final blend 1 is tabulated in Table 3:
Table 3: Final Blend 1 components concentration
Blend 1 (Hydrating Blend)
Sr No. Ingredient Conc (in % w/w)
1 Glycerin 65.72
2 Propanediol 14.29
3 Imidazolidinyl Urea 7.14
4 Glyceryl Glucoside 2.85
5 Sodium Pyrrolidone Carboxylic Acid 5.71
6 Butylene Glycol 2.86
7 Phenoxyethanol 1.29
8 Ethylhexylglycerin 0.14

Preparation of (b) Trial Blend 1 involves mixing the components Glycerin, Propanediol, Imidazolidinyl Urea, Glyceryl Glucoside, Sodium Pyrrolidone Carboxylic Acid, Butylene Glycol, Phenoxyethanol, and Ethylhexylglycerin according to the amounts specified in Table 4:
Table 4: Designs of Trial Blend 1
Trial Blend 1 (Hydrating Blend)

Sr No. Ingredient Conc (in % w/w)
1 Glycerin 55-75
2 Propanediol 0-10
3 Imidazolidinyl Urea 20-35
4 Glyceryl Glucoside 0-10
5 Sodium Pyrrolidone Carboxylic Acid 0-10
6 Butylene Glycol 0.5-5
7 Phenoxyethanol 0.5-5
8 Ethylhexylglycerin 0.5-5

A specific example of Blend 1 trials is mentioned below (Table 5):

Table 5: Example of one of the trails of Blend 1
Blend 1 (Hydrating Blend)
Sr No. Ingredient Conc (in % w/w)
1 Glycerin 63.36
2 Propanediol 1.00
3 Imidazolidinyl Urea 29.85
4 Glyceryl Glucoside 0.50
5 Sodium Pyrrolidone Carboxylic Acid 1.00
6 Butylene Glycol 2.86
7 Phenoxyethanol 1.29
8 Ethylhexylglycerin 0.14

Example 2: Preparation of Second Blend
Two blends were prepared comprising Polysorbate 20, PEG-40 Hydrogenated Castor Oil, Tocopherol Acetate, and Vegetable Squalane as (a) Blend 2 and (b) Trial Blend 2.

Preparation of (a) Blend 2 involves mixing the components Polysorbate 20, PEG-40 Hydrogenated Castor Oil, Tocopherol Acetate, and Vegetable Squalane according to the amounts specified in Table 6:
Table 6: Designs of Blend 2
Blend 2 (Moisturizing Blend)

Sr No. Ingredient Conc (in % w/w)
1 Polysorbate 20 20-40
2 PEG-40 Hydrogenated Castor Oil 20-40
3 Tocopherol Acetate 20-40
4 Vegetable Squalane 1-10

More specifically the concentration of the components in the final blend 2 is provided in Table 7:
Table 7: Final Blend 2 components concentration
Blend 2 (Moisturizing Blend)
Sr No. Ingredient Conc (in % w/w)
1 Polysorbate 20 32
2 PEG-40 Hydrogenated Castor Oil 32
3 Tocopherol Acetate 32
4 Vegetable Squalane 4

Preparation of (b) Trial Blend 2 involves mixing the components Polysorbate 20, PEG-40 Hydrogenated Castor Oil, Tocopherol Acetate, and Vegetable Squalane according to the amounts specified in Table 8:
Table 8: Designs of Trial Blend 2
Trial Blend 2 (Moisturizing Blend)
Sr No. Ingredient Conc (in % w/w)
1 Polysorbate 20 40-70
2 PEG-40 Hydrogenated Castor Oil 20-40
3 Tocopherol Acetate 0-10
4 Vegetable Squalane 0-10

A specific example of Blend 2 trials is mentioned below in Table 9:
Table 9: Example of one of the trails of Blend 2
Blend 2 (Moisturizing Blend)
Sr No. Ingredient Conc (in % w/w)
1 Polysorbate 20 66
2 PEG-40 Hydrogenated Castor Oil 32
3 Tocopherol Acetate 1
4 Vegetable Squalane 1

Example 3: Preparation of System
A number of systems were prepared by combining a hydrating blend and moisturizing blends at a ratio between hydrating blend and moisturizing blend as 1:0.2 and 0.8:0.45. Details of such systems are shown in Table 10.

Example 4: Preparation of a Rinse off Cosmetic product
Number of rinse off cosmetic products were formulated as Trial 6-Trial 18, and compared with plain water (Trial 1), marketed Syndet products (Trial 2-4) and marketed soap based product (Trial 5). Trial 6 is a placebo control formulation comprising raw materials as described in Table 10.
Table 10: Formula of Placebo/control sample
Raw Material Req. Qty
Aqua 43.440
Sodium Lauryl Sarcosinate 27.000
Acrylates Copolymer 13.000
Cocoamidopropyl Betaine 5.000
Coco Ampho Di Acetate 5.000
Glycerin 2.500
Phenoxyethanol 0.720
Betain Anhydrous 0.500
Sodium PCA 0.800
Sodium Hydroxide 0.500
Hydrogenated Castor Oil 0.500
Sodium Benzoate 0.250
Aloe Vera Extract 0.200
Lime Oil 0.200
D Panthenol 0.100
Sodium Ascorbyl Phosphate (SAP) 0.100
Ethylhexyl Glycerine 0.080
Lemon Oil 0.050
Menthol Crystal 0.050
Neem Leaf Extract 0.010
Components of the Trial formulations Trial 7-18 is shown in Table 11. Table 11 summarizes the design of formulations.

Table 11: Designs of Formulations
Trial Prototype
Trial 1 With portable Water
Trial 2 Marketed gel based neem Face wash – 1
Trial 3 Marketed gel based foaming Face wash – 2
Trial 4 Marketed Soap based niacinamide Face wash – 1
Trial 5 Marketed Soap based activated charcoal Face wash – 2
Trial 6 Placebo/Control
Trial 7 Control +
Blend 1 (Hydrating Blend) - 1% +
Blend 2 (Moisturizing Blend) - 0.2%
Trial 8 Control +
Blend 1 (Hydrating Blend) - 0.8% +
Blend 2 (Moisturizing Blend) - 0.45%
Trial 9 Control +
Glycerin - 1% +
Blend 2 (Moisturizing Blend) - 0.2%
Trial 10 Control +
Imide Urea - 1% +
Blend 2 (Moisturizing Blend) - 0.2%
Trial 11 Control +
Propanediol - 1% +
Blend 2 (Moisturizing Blend) - 0.2%
Trial 12 Control +
Hydragen Aquaporin - 1% +
Blend 2 (Moisturizing Blend) - 0.2%
Trial 13 Control +
Sodium PCA - 1% +
Blend 2 (Moisturizing Blend) - 0.2%
Trial 14 Control +
Butylene Glycol - 1% +
Blend 2 (Moisturizing Blend) - 0.2%
Trial 15 Control +
Blend 1 (Hydrating Blend) - 1% +
Vitamin E - 0.2%
Trial 16 Control +
Blend 1 (Hydrating Blend) - 1% +
Veg Squalane - 0.2%
Trial 17 Control +
Optimization trial Blend 1 (Hydrating Blend) - 1% +
Blend 2 (Moisturizing Blend) - 0.2%
Trial 18 Control +
Blend 1 (Hydrating Blend) - 1% +
Optimization trial Blend 2 (Moisturizing Blend) - 0.2%

Example 5: Evaluations of the Formulations
The formulations as disclosed in Table 11 were analyzed for hydration effect, pH analysis, viscosity analysis, foamability analysis and consumer evaluations.

Hydration Study: A controlled, single-center, open-label hydration study was conducted to evaluate the impact of various face wash formulations on stratum corneum hydration levels in human subjects. The study population consisted of 30 volunteers exhibiting a spectrum of different skin types, encompassing self-reported dry, normal, and oily skin conditions. Prior to product application, subjects underwent a standardized skin cleansing protocol using deionized water, followed by an equilibrate period of 30 mins subsequently taking measurements at regular intervals of time in a controlled environment to allow for normalization of skin surface conditions and minimize the influence of transient environmental factors. Following equilibration, baseline stratum corneum hydration measurements were acquired using a calibrated corneometer (Model CM 825). These initial readings served as the control or baseline values against which subsequent post-application hydration changes were calculated. Following application of the assigned face wash formulation according to standardized instructions, the product was thoroughly rinsed from the skin with deionized water. Post-application stratum corneum hydration measurements were then recorded using the corneometer at pre-determined time intervals (e.g., 0, 30, and 60 minutes) over a one-hour period. This methodology allowed for the assessment of both immediate as well as sustained hydration effects of the tested face wash formulations.

Table 12 and Figure 2 shows the hydration study result of Syndet Face Wash (Trial 1, Trial 2 and Trial 3), while Table 8 and Figure 3 shows the hydration study result of Soap based Face Wash (Trial 4, and Trial 5), with respect to Syndet Face wash (Trial 1).

Table 12. Hydration Study Results of syndet based face wash
Sr No. Trial Moisture Content (in %) pH
Blank 0 Mins 30 Mins 60 mins
1 Trial 1 100 100.61
± 3.45 92.45
± 3.86 91.43
± 3.60 6.50
2 Trial 2 100 99.76
± 6.77 89.51
± 4.21 84.95
± 4.05 6.10
3 Trial 3 100 93.94
± 5.41 88.35
± 5.61 84.25
± 6.11 10.1

Table 13. Hydration Study Results of soap based face wash
Sr No. Trial Moisture Content (in %) pH
Blank 0 Mins 30 Mins 60 mins
1 Trial 1 100 100.61
± 3.45 92.45
± 3.86 91.43
± 3.60 6.50
2 Trial 4 100 109.02
± 3.41 94.15
± 3.39 93.79
± 2.11 10.25
3 Trial 5 100 99.19
± 3.36 95.57
± 4.05 93.18
± 4.07 10.42

The data as shown in Tables 12 and 13 and figure 2 and figure 3 established the hypothesis that both soap-based and syndet-based face wash disrupt the skin's natural barrier function, leading to a decrease in skin hydration levels is validated. Even though trial 4 shows signs of improved instant hydration, it fails to deliver sustained hydration which eventually results in drying out the skin. The results indicate that all tested marketed face wash, regardless of their base, exhibited a dehydrating effect on the skin.

Table 14 and Figure 4 shows the data for rinse off cosmetic products Trial 6, Trial 7 and Trial 8. Trial 6 is a control product while Trial 7 and Trail 8 contain combination of Blend 1 and Blend 2 at a ratio 1:0.2 and 0.8:0.45 respectively compositions prepared.

Table 14. Hydration study results of control sample vs control sample + blends
Sr. No Name of the Product Moisture Content
Blank After 0 Min After 30 Min After 1 hrs
1 Trial 6 100.00 112.32
± 3.58 102.69
± 1.70 97.3
± 2.77
2 Trial 7 100.00 113.32
± 1.88 109.21
± 1.53 106.11
± 1.96
3 Trial 8 100.00 101.89
± 3.02 97.37
± 2.94 96.25
± 2.79

As observed from Table 14 and Figure 4, trials 7 and 8 both incorporate blends at varying concentrations; however, trial 7 utilizes the blend in an optimized ratio. This data proves the efficacy of the current invention and validates that the blends consist of a precisely balanced combination of humectants and emollients, which work together to enhance skin hydration. These blends provide immediate hydration upon application, while also ensuring long-term moisture retention, promoting sustained skin hydration and a healthier skin barrier over time.

Table 15 and Figure 5 shows the data for rinse off cosmetic products Trial 9-Trial 18 containing combination of specific humectant with Blend 2 (Trial 9-14), combination of specific moisturizing agent with Blend 1 (Trial 15-Trial 16), combination of Trial Blend 1 and Blend 2 (Trial 17), and combination of Blend 1 and Trial Blend 2 (Trial 18). All combinations were provided at a ratio of 1:0.2

Table 15. Hydration Results which prove the synergistic behavior of current invention
Sr. No Name of the Product Moisture Content
Blank After 0 Min After 30 Min After 1 hrs
1 Trial 9 100.00 105.13
± 3.06 103.58
± 2.53 101.46
± 2.94
2 Trial 10 100.00 103.39
± 2.82 101.82
± 2.57 100.27
± 2.71
3 Trial 11 100.00 106.67
± 1.87 104.32
± 1.81 101.3
± 1.67
4 Trial 12 100.00 96.90
± 2.36 94.71
± 2.53 92.68
± 2.84
5 Trial 13 100.00 101.51
± 2.70 108.95
± 2.84 110.45
± 2.86
6 Trial 14 100.00 85.06
± 3.51 92.26
± 3.93 89.94
± 3.54
7 Trial 15 100.00 86.35
± 2.21 91.91
± 1.73 88.45
± 2.46
8 Trial 16 100.00 116.36
± 6.28 104.40
± 5.08 100.51
± 4.58
9 Trial 17 100.00 110.83
± 5.93 100.31
± 3.82 97.02
± 4.12
10 Trial 18 100.00 111.39
± 2.82 102.91
± 1.76 98.14
± 2.14

Table 15 and Figure 5 illustrates that trial 16 demonstrated enhanced efficacy with prolonged hydration. However, when incorporated into the control sample, the product transitioned from a clear to a hazy appearance, indicating its incompatibility with clear formulations. Trail 17 and 18 shows good immediate hydration effect but is unable to provide sustained hydration. The blends clearly proves the synergistic effect as evident from the data, emphasizing that their formulation is not the result of chance but rather the outcome of a meticulously structured design process aimed at achieving an optimal level of hydration. Each component within the blend has been selected based on its specific function and interaction with other ingredients to enhance the overall moisturizing effect. This careful formulation process maximizes the hydration potential of the blend, reflecting a scientifically informed approach to skin moisture management.

pH Analysis: The pH was measured as per Indian Standard 2711 using a digital pH meter. pH of the solution was measured using a Mettler Toledo pH meter at a constant temperature of 25°C. Prior to measurement, the pH meter was calibrated using standard buffer solutions with known pH values (typically pH 4.00, 7.00, and 10.00). pH measurement was determined by taking 100 ml product in a 150 ml beaker. The pH was recorded after stabilization of the reading.

Viscosity Analysis: Viscosity of the solution was determined by IS 6608 (2004) method using a Brookfield Ametek RV Viscometer (Model D220) at a constant temperature of 25°C. The measurement was conducted with spindle number 4 at a rotational speed of 12 rpm. Prior to testing, the viscometer was calibrated with standard calibration fluids. The solution was carefully placed in the viscometer cup and viscosity readings were recorded once the system stabilized. All measurements were carried out at room temperature (25°C) to maintain consistency and minimize temperature-related variations in viscosity. Additionally, product stability was rigorously monitored by subjecting the formulations to elevated temperature conditions (50°C) over a defined period, with periodic analysis of key physicochemical parameters - viscosity & pH.

Table 16 shows the pH and Viscosity for Trial 6 and Trial 7 at various timepoint.
Table 16. Analytical parameters at various timepoint
Timepoint Parameter/Trial Trial 6 Trial 7
Initial Viscosity @ 25°C
(Spindle 4, 12 rpm) 13,180 cps 13,530
pH @ 25°C 6.98 6.99
1 week Viscosity @ 25°C
(Spindle 4, 12 rpm) 12,400 11,130
pH @ 25°C 6.97 6.92
3 week Viscosity @ 25°C
(Spindle 4, 12 rpm) 12,400 12,170
pH @ 25°C 6.99 6.95
6 week Viscosity @ 25°C
(Spindle 4, 12 rpm) 11,913 12,233
pH @ 25°C 6.89 6.91

The findings indicated that the inclusion of the blend had negligible impact on the stability of the rinse-off formulation, reaffirming its suitability for this application. These parameters are crucial in determining the formulation's compatibility with skin and its overall performance.

Foamability Analysis: The lather was measured as per IS 13498 annex B method. A 4% w/w solution was prepared by dissolving the appropriate amount of the substance in water. 100 ml of this solution was poured into the blender jar of a mixie fixed with 450 W motor covered and blended on low speed for exactly 60 s. The blender was operated at an input voltage of 230 ± 10 V at the low setting. The blender jar was then inverted over the 1000 ml capacity measuring cylinder and any lather adhering to the jar was scooped out and allowed to drain. The lather volume was measured after leveling off the top surface of the foam. The analysis was carried out at an ambient temperature of 27 ± 2°C. Table 17 shows the foamability analysis for Trial 6-Trial 18.

Table 17. Foamability results of trials
Sr. No Name of the Product Foamability (ml)
1 Trial 6 260
2 Trial 7 290
3 Trial 8 230
4 Trial 9 260
5 Trial 10 260
6 Trial 11 270
7 Trial 12 270
8 Trial 13 270
9 Trial 14 270
10 Trial 15 270
11 Trial 16 290
12 Trial 17 280
13 Trial 18 290

Tables 16 and Table 17 shows that the incorporation of the blends results in little to no significant change in the analytical parameters of the product. Additionally, the current formulation does not compromise the stability of the product, remaining stable even under prolonged exposure to elevated temperatures (50?C). In fact, the incorporation of blends in the formulation along with providing the primary benefit of skin hydration, also improves the foamability of the face washes. These findings suggest that the blends are effectively integrated into the formulation without negatively affecting the product's overall performance or physical integrity.

Consumer Evaluation Study: A consumer perception study was conducted to evaluate the acceptability, satisfaction, and overall perception of the product among 30 participants with a mix of dry, oily, normal, and combination skin types. The study employed a structured survey methodology, incorporating qualitative measures to assess key factors such as product efficacy, sensory attributes, and user experience. Over a 5-day usage period, participants rated various product attributes on a 5-point scale (1 = worst, 5 = best), including texture, fragrance, appearance, and perceived effectiveness. The collected data was analyzed to identify participant preferences, overall ratings, and key insights into product performance.

Table 18 summarizes few of the parameters which were analysed during the consumer study.
Table 18. Overall Rating of Consumer Study (30 Adults age 25-35)
Parameters Trial 6 Trial 7 Trial 8
Foamability 3.0 4.7 2.8
Post Feel 3.9 4.8 3.0
Spreadability 4.0 4.0 4.0
Overall Rating 3.4 4.6 2.7

Trial 7 was preferred by consumers over Trials 6 and 8, with a notable preference for its enhanced post-use sensory characteristics and improved foaming performance. Additionally, consumers reported a more favorable tactile experience upon application, citing an improvement in the post-feel, which was characterized by greater smoothness and comfort.

The efficacy of the blends was evaluated both qualitatively & quantitatively, with particular attention given to identifying potential synergistic interactions that could contribute to improved skin hydration. The foaming properties of the formulation were also assessed to ensure that the addition of the blend did not adversely impact these characteristics. Notably, the results demonstrated that the blend exhibited a minor but beneficial synergistic effect, leading to a slight enhancement in foaming performance rather than any deterioration. Thus, considering the desired characteristics required in a face wash product along with the effect of moisturization and hydration, it is Trial 6 comprising the system of blends according to the present invention, qualifying all the standards, which establishes the synergism required between the amounts of the components in system containing Blends and the ratio at which such system is provided.

ADVANTAGE OF THE INVENTION
The present invention provides a system for enhanced skin hydration and moisturization in rinse-off cosmetic products. The system utilizes a proprietary blend of hygroscopic agents, emollients, and humectants. This blend is formulated for compatibility with diverse cosmetic bases, including face washes, creams, lotions, and body washes. A key feature is the blend's ease of incorporation into formulations at ambient temperature, eliminating the need for external heating. The synergistic action of the blend's components promotes superior cutaneous hydration and moisturization. This enhanced performance is demonstrable through both subjective consumer perception and objective instrumental analysis. The invention addresses the challenge of delivering effective hydration from rinse-off products. The specific hygroscopic agents, emollients, and humectants comprising the blend are undisclosed but are optimized for synergistic effect. The resulting formulations provide improved skin hydration and a more comfortable post-rinse feel. This technology represents a significant advancement in rinse-off product efficacy. The invention is applicable to a broad range of personal care products. The blend's stability and efficacy are maintained across various formulation types. The improved hydration benefits are long-lasting, even after the product is rinsed off.

Face wash, whether soap-based or syndet-based, are recognized for disrupting this balance, leading to potential adverse outcomes such as transepidermal water loss (TEWL), dryness, pruritus, skin irritation, and, in severe cases, exacerbated dermatological conditions. As evidenced by the data, commercially available face wash are frequently associated with these undesirable effects. The present invention, however, offers a solution by providing enhanced hydration even at suboptimal concentrations, effectively mitigating these disruptions. This formulation can be incorporated into topical products without requiring thermal activation, thus avoiding the potential for degradation of active ingredients. Furthermore, the inclusion of this invention induces minimal to no deviation in critical physicochemical properties of the final product. The invention facilitates both immediate and sustained hydration, ensuring prolonged moisture retention. Synergistic effects were observed, as demonstrated by quantitative hydration assessments using a corneometer, indicating significant improvements in skin hydration. These enhancements were also corroborated by subjective consumer evaluations, which confirm the perceivable benefits of the formulation. Notably, the invention was integrated into a face wash, and subsequent stability testing under elevated temperatures (50°C) revealed no signs of product instability over a six-week observation period, further supporting the robustness and efficacy of the formulation.
, Claims:
1. A rinse-off cosmetic product having moisturizing and hydration effects, comprising a system for imparting hydration and moisturization, wherein the system includes a first blend; and a second blend; wherein the first blend and the second blend are combined at a ratio of 1:0.2.

2. A rinse-off cosmetic product having moisturizing and hydration effects, comprising:
a system for imparting hydration and moisturization, wherein the system includes:
? a first blend comprising Glycerin at an effective concentration of 55-75% wt/wt, Propanediol at an effective concentration of 0-10% wt/wt, Imidazolidinyl Urea at an effective concentration of 20-35% wt/wt, Glyceryl Glucoside at an effective concentration of 0-10% wt/wt, Sodium Pyrrolidone Carboxylic Acid at an effective concentration of 0-10% wt/wt, Butylene Glycol at an effective concentration of 0.5-5% wt/wt, Phenoxyethanol at an effective concentration of 0.5-5% wt/wt, and Ethylhexylglycerin at an effective concentration of 0.5-5% wt/wt; and
? a second blend comprising Polysorbate 20 at an effective concentration of 20-40% wt/wt, PEG-40 Hydrogenated Castor Oil at an effective concentration of 20-40% wt/wt, Tocopherol Acetate at an effective concentration of 20-40% wt/wt, and Vegetable Squalane at an effective concentration of 1-10% wt/wt;
wherein the first blend and the second blend are combined at a ratio of 1:0.2.

3. The rinse-off cosmetic product of claim 1, wherein the first blend comprises skin protein-stimulating agents to enhance the skin's natural barrier function.

4. The rinse-off cosmetic product of claim 1, wherein the second blend includes antioxidants that scavenge free radicals and prevent the formation of reactive oxidants.

5. The rinse-off cosmetic product of claim 1, wherein the system is incorporated into a face wash formulation.

6. The rinse-off cosmetic product of claim 1, wherein the system is incorporated into a body wash formulation.

7. The rinse-off cosmetic product of claim 1, wherein the system is incorporated into a cleanser formulation.

8. The rinse-off cosmetic product of claim 1, wherein the system is incorporated into a shampoo formulation.

9. The rinse-off cosmetic product of claim 1, wherein the system provides sustained hydration and moisturization effects even after the product is rinsed off.

10. The rinse-off cosmetic product of claim 1, wherein the system is formulated to be compatible with diverse cosmetic bases, including creams and lotions.

11. A system for imparting hydration and moisturization in a rinse-off cosmetic product, comprising:
o a first blend comprising:
? Glycerin at an effective concentration of 55-75% wt/wt,
? Propanediol at an effective concentration of 0-10% wt/wt,
? Imidazolidinyl Urea at an effective concentration of 20-35% wt/wt,
? Glyceryl Glucoside at an effective concentration of 0-10% wt/wt,
? Sodium Pyrrolidone Carboxylic Acid at an effective concentration of 0-10% wt/wt,
? Butylene Glycol at an effective concentration of 0.5-5% wt/wt,
? Phenoxyethanol at an effective concentration of 0.5-5% wt/wt, and
? Ethylhexylglycerin at an effective concentration of 0.5-5% wt/wt;
o a second blend comprising:
? Polysorbate 20 at an effective concentration of 20-40% wt/wt,
? PEG-40 Hydrogenated Castor Oil at an effective concentration of 20-40% wt/wt,
? Tocopherol Acetate at an effective concentration of 20-40% wt/wt, and
? Vegetable Squalane at an effective concentration of 1-10% wt/wt;
wherein the first blend and the second blend are combined at a ratio of 1:0.2 to impart sustained hydration and moisturization effects.

12. The system of claim 11, wherein the first blend further includes skin protein-stimulating agents to enhance the skin's natural barrier function and increase resilience.

13. The system of claim 11, wherein the second blend includes antioxidants that scavenge free radicals and prevent the formation of reactive oxidants.

14. The system of claim 11, wherein the combination of the first blend and the second blend provides a synergistic effect that enhances epidermal repair and mitigates the effects of dryness and irritation.

15. A rinse-off cosmetic product having moisturizing and hydration effects, produced by a process comprising the steps of:
1. providing a system for imparting hydration and moisturization, the system comprising:
a first blend including Glycerin at an effective concentration of 55-75% wt/wt, Propanediol at an effective concentration of 0-10% wt/wt, Imidazolidinyl Urea at an effective concentration of 20-35% wt/wt, Glyceryl Glucoside at an effective concentration of 0-10% wt/wt, Sodium Pyrrolidone Carboxylic Acid at an effective concentration of 0-10% wt/wt, Butylene Glycol at an effective concentration of 0.5-5% wt/wt, Phenoxyethanol at an effective concentration of 0.5-5% wt/wt, and Ethylhexylglycerin at an effective concentration of 0.5-5% wt/wt;
a second blend including Polysorbate 20 at an effective concentration of 20-40% wt/wt, PEG-40 Hydrogenated Castor Oil at an effective concentration of 20-40% wt/wt, Tocopherol Acetate at an effective concentration of 20-40% wt/wt, and Vegetable Squalane at an effective concentration of 1-10% wt/wt;
combining the first blend and the second blend at a ratio of 1:0.2 to form the system; and
2. incorporating the system into a rinse-off composition to produce the rinse-off cosmetic product.