Cold-process method of manufacturing for sunscreen lotions and creams

Abstract

An innovative cold process for manufacturing a lotion with sunscreen properties. The sunscreen includes an aqueous phase, a liquid SPF-tunable cold-processable UV filter, a liquid cold-processable emulsifier, and, optionally, a liquid cold-processable rheology modifier. In combination, the process creates a pleasant and stable emulsion.

Description

[0001] COLD-PROCESS METHOD OF MANUFACTURING FOR SUNSCREEN LOTIONS AND CREAMS

[0002] CROSS-REFERENCE TO RELATED APPLICATIONS

[0003] This application claims priority to U.S. Provisional No. 63 / 658,208, the contents of which are hereby incorporated by reference in their entirety.

[0004] FIELD

[0005] This invention relates to a novel process of sunscreen manufacturing, employing very low or no thermal energy to obtain a stable, pleasant oil-in-water emulsion with desired SPF properties.

[0006] BACKGROUND

[0007] Sunscreen cream and lotion formulations are typically oil-in-water (o / w) emulsions, where the oil phase acts not only as an emollient, such as in classic cream and lotions, but also as the main solvent used to dissolve organic filter active ingredients (UVA / UVB filters). Those organic filters have known different solubility properties and typically require considerable thermal energy in order to be dispersed and dissolved in the oil phase. This physical property precludes any so called “cold-processing” methods to produce a sunscreen lotion with organic UV filters, which impacts energy cost, time in manufacturing, and the “green” environmental footprint.

[0008] A common industrial process for manufacturing a sunscreen lotion or cream involves preparing an oil phase containing the “solvent” to dissolve the organic active filters (UVA and UVB). The solvent typically needs to be heated up to 80-90°C to solubilize the filters. This step requires a high amount of energy to just dissolve the filters. Unfortunately, those temperatures are often also too high to incorporate other ingredients, so the reactors involved need to first be cooled to add them. This process thus involves more energy and time than would be required if the solvent did not need to be heated. Solid fats or waxes are often added to increase the “body” of the lotion / cream, and it also requires heat to melt these components. When this step is done in the same vessel where the active filters have been dissolved, the mass increases, as does the quantity of heat to dissolve all the ingredients.

[0009] For these reasons, the only current cold processes are those employing inorganic UV filters, such as zinc and titanium oxides. These types of filters limit the overall outcome regarding sensorial preferences in sunscreens, for example, whitening, stickiness, and poor spreadability.

[0010] Accordingly, it would be advantageous to have additional cold processing methods, and sunscreen mixtures having preferred sensorial attributes.

[0011] SUMMARY

[0012] The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an extensive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention; its sole purpose is to present concepts of the invention in a simplified form as a prelude to the more detailed description that is subsequently presented.

[0013] Described herein are compositions, methods and systems relating to sunscreen mixtures. In one exemplary embodiment, the invention allows the formulation of a cold process SPF sunscreen lotion with the following ingredients and / or features:

[0014] The use of a highly concentrated liquid organic UVA / UVB filter blend is necessary to have a SPF-tunable ingredient for sunscreen formulation. In one embodiment, the UVA / UVB filter blend is commercially available from 3V SIGMA USA INC., and named “UVASORB COMPLETE.” This filter blend allows for the incorporation of all the necessary UVA-UVB filters in a liquid form that requires negligible to practically no heat to be processed.

[0015] The use of a highly efficient liquid emulsifier system that allows for the emulsification of the oil phase in the aqueous phase in an elegant and homogenous way. This ingredient, including for example one commercially available from 3V SIGMA USA INC. named “EMULSIDERM MPN,” (INCI: Polyglyceryl-6 Laurate (and) Caprylic / Capric Triglyceride (and) Olive Oil Polyglyceryl-6 Esters (and) Lecithin) is 100% natural, liquid and cold-processable and will work as the primary / sole emulsifier.

[0016] The use of a liquid and performing rheology stabilizer to increase viscosity, creating a structured network, and blocking the free water to stabilize the emulsion. This ingredient, including for example one commercially available from 3V SIGMA USA INC. named “RAPIDGEL EZ2,” (INCI: Dicaprylyl Ether, Acrylates / Vinyl Isodecanoate Crosspolymer, Aminomethyl Propanol) acts as the main rheology modifier, co-emulsifying system, and stabilizer. The liquid form allows it to be easily used in cold processing as well hot traditional processing.

[0017] In one embodiment, the combined use of Uvasorb Complete (a liquid) together with Emulsiderm MPN (also a liquid) and Rapidgel EZ2 (also a liquid) allows one to provide a sunscreen lotion that can be formed using cold-processing.

[0018] In another embodiment, the sunscreen lotion comprises Uvasorb Complete, and it can be present in a lotion / cream processed using hot-processing, xav

[0019] In another embodiment, the Uvasorb Complete can be combined with EMULSIDERM MPN, and either not include a rheology modifier, or use rheology modifiers other than RAPIDGEL EZ2.

[0020] In still another embodiment, the Uvasorb Complete can be combined with an emulsifier other than EMULSIDERM MPN, and then combined with RAPIDGEL EZ2 as a rheology modifier.

[0021] Other features and their advantages will be readily apparent to those skilled in the arts.

[0022] DETAILED DESCRIPTION

[0023] Embodiments described herein can be understood more readily by reference to the following detailed description, examples, and claims. Elements, components and methods described herein, however, are not limited to the specific embodiments presented in the detailed description, examples, and claims. In particular, these embodiments are merely illustrative of the principles of the present invention. Accordingly, this disclosure is not intended to embrace all such alternatives, modifications and variations that fall within the spirit and broad scope of the specification and in view of the claims.

[0024] All publications, patents and patent applications mentioned in this specification are incorporated herein in their entirety by reference, to the same extent as if each individual publication, patent, or patent application was specifically and individually indicated to be incorporated herein by reference. In addition, citation or identification of any reference in this application shall not be construed as an admission that such reference is available as prior art to the present invention. To the extent that section headings are used, they should not be construed as necessarily limiting.

[0025] In addition, all ranges disclosed herein are to be understood to encompass any and all subranges subsumed therein. For example, a stated range of “1 .0 to 10.0” should be considered to include any and all subranges beginning with a minimum value of 1 .0 or more and ending with a maximum value of 10.0 or less, e.g., 1 .0 to 5.3, or 4.7 to 10.0, or 3.6 to 7.9. All ranges disclosed herein are also to be considered to include the end points of the range, unless expressly stated otherwise. For example, a range of “between 5 and 10,” from 5 to 10,” or “5-10” should generally be considered to include the end points 5 and 10.

[0026] Further, when the phrase “up to” is used in connection with an amount or quantity, it is to be understood that the amount is at least a detectable amount or quantity. For example a material present in an amount “up to” a specified amount can be present from a detectable amount and up to and including the specified amount.

[0027] Additionally, in any disclosed embodiment, the terms “substantially,” “approximately,” and “about” may be substituted with “within [a percentage] of” what is specified, where the percentage includes 0.1 , 1 , 5, and 10 percent.

[0028] It is also to be understood that the article “a” or “an” refers to “at least one,” unless the context of a particular use requires otherwise.

[0029] The present disclosure is directed to a process for making sunscreen mixtures. A sunscreen lotion is typically an oil in water emulsion (o / w). The lotion is commonly prepared using two vessels: one containing the aqueous phase, the other containing the oil phase and the emulsifiers. Water-soluble ingredients are added and mixed in the aqueous phase while the oil-soluble are added and mixed in the oil phase. Those two phases need to be brought at the same temperature before mixing them; the rule of thumb is that they need to be both heated at a temperature that is 10°C-20°C higher than the highest melting point component before mixing. Even if using low melting point components, the heating step is required to solubilize the organic UV active filters and, depending on the chosen UV filters, may be necessary to reach temperatures as high as 90°C. The necessity of high temperatures for the organic UV filters forces the manufacturing to bring both phases (water and oil) to the same high temperature required to create a stable emulsion and to avoid the re-crystallization of the organic UV filters during the emulsification phase.

[0030] Below are common ingredients and steps for a hot-process (current methods) o / w lotion (which are typically necessary for sunscreen lotions / creams):

[0031] An aqueous phase containing all the water-soluble ingredients (typically glycols, glycerin, chelant, etc.) is prepared. In the traditional hot-process, this aqueous phase is typically heated, for example, to a temperature between about 70°C and about 90°C. Also, rheological stabilizers (carbomers, gums, celluloses, etc.) are dispersed in this phase, which requires additional time or specialized equipment to disperse them quickly and completely. The aqueous phase typically represents about 50%-70% of the total batch size, so the amount of energy used with the traditional hot-process is typically consistent in this step.

[0032] An oil phase containing UV filters (which can be solid or liquid), as well as one or more additional oils, emollients, butters, an emulsifying system, or other co-emulsifiers, is prepared. In the traditional hot-process, this oil phase is typically heated to between about 70°C and about 90°C to fully solubilize the UV active filters. The oil phase typically represents about 20%-40% of the total batch size, so the amount of energy used with the traditional hot-process is typically consistent in this step.

[0033] The emulsification step, where the two hot phases are mixed vigorously through an emulsification system (i.e., a high shear device), to form a stable and homogeneous emulsion.

[0034] Certain components cannot be added when the aqueous phase, oil phase or emulsion is at these temperatures, so there is typically a cooling step, where the emulsion is cooled down from the relatively higher temperature required to solubilize the organic UV active filters and traditional emulsifiers, butters, waxes to values, so more delicate (i.e., temperature sensitive) ingredients can be added. Examples of such temperaturesensitive ingredients include fragrances, preservatives, and the like. This step requires energy and time to bring down the entire mass of the batch to the desired temperature. Often this step cannot be accelerated to avoid problems with the structuring of the emulsion.

[0035] When the cooling step is completed, there is a further step where other ingredients such as preservatives, fragrances and other minor ingredients are added. Representative preservatives include phenoxyethanol, parabens, and disodium EDTA. These preservatives can help prevent bacterial and fungal growth, extend shelf life, and maintain product stability. The preservatives are typically present in a range of about 0.1 to about 2% w / w.

[0036] Sunscreen products often include, as a fragrance, the scent of cocoa butter, coconut oil and / or jasmine, though other fragrances can be present. The amount of fragrance in sunscreen varies significantly, but is typically in the range of from about 0.3% and about 0.8%.

[0037] Fragrances and preservatives are typically added after the emulsion is formed. These components do not need additional solubilizers, because they are already present in the emulsion. In some embodiments, these ingredients can disrupt the formation of the emulsion if added before / during the formation of the emulsion itself. So, in some embodiments, these components are added after the emulsion is formed. In another embodiments, to the extent their addition does not adversely affect the formation of the emulsion itself, one or more of these components can be present while the emulsion is formed.

[0038] By contrast, using the components described herein, in one exemplary embodiment, an o / w lotion may include the ingredients and / or be produced using the process steps below:

[0039] An aqueous phase containing all the water-soluble ingredients to be present in the final product (typically glycols, glycerin, chelants, etc.) is prepared. In this embodiment, a heating step is not required, removing the need for intense energy.

[0040] An oil phase containing UVASORB COMPLETE, other oils, emollients, low melting point butters, EMULSIDERM MPN (INCI: Polyglyceryl-6 Laurate (and) Caprylic / Capric Triglyceride (and) Olive Oil Polyglyceryl-6 Esters (and) Lecithin) is prepared. In one aspect of this embodiment, EMULSIDERM MPN is the sole emulsifying agent. In this embodiment, a heating step is not required, as the UVASORB COMPLETE is liquid and soluble at room temperature in the oil phase. This removes the need for intense energy to dissolve the UV sunscreen filters. The use of EMULSIDERM MPN further simplifies the formula, since its liquid status completely avoids the need to heat the oil phase to dissolve the UV sunscreen filters. However, in other aspects of this embodiment, one or more additional emulsifiers can be used that require some heat, as well as in cases when the formula requires solid butter to be used. In these aspects, the oil phase is typically heated to a relatively lower temperature (i.e., about 40°C or less) to melt the components, relative to the 70°C-90°C required to solubilize the UV filters in prior methods. The use of UVASORB COMPLETE and EMULSIDERM MPN can, in some embodiments, reduce the amount of heat normally required by half.

[0041] The emulsification step, where the two hot phases are mixed vigorously through an emulsification system (i.e., a high shear device).

[0042] No cooling step is necessary (energy / time saving).

[0043] In a final step, other ingredients like preservatives, fragrances and minor ingredients can be added. In this step, using a liquid rheology modifier like RAPIDGEL EZ2, can be present to further reduce the manufacturing time, adding increased viscosity, locking the emulsion and stabilizing the formula. The associative characteristics of this component increase the viscosity by creating a network with other fats and oils, acting also as a secondary emulsifier. Furthermore, the liquid state allows it to be added at the end of the process, removing the need for solid dispersing systems.

[0044] Other rheology modifiers can be used. If they are solid (i.e., powders), they are generally dispersed in the aqueous phase as reported in point a) or, if liquid, also in the oil phase or at the end of emulsifying step (like the Rapidgel EZ2).

[0045] The o / w emulsion created using this process is stable, pleasant on the skin and keeps the organic UV filters in a stable formula. If a low-melting point butter, or only oils, are used, there is no need for a significant addition of heat during the process, and the emulsion is stable even if mixed with regular impellers. The use of high shear devices to create the emulsion is suggested, but not necessary in most applications. As used herein, the term “UVASORB COMPLETE” refers to a mixture having the following components:

[0046] 1 ) A highly efficient UVB filter (Uvasorb HEB, also known as diethylhexyl butamido triazone (DEBT) or Iscotrizinol);

[0047] 2) A UVA filter (for example, DHHB, Diethylamino hydroxybenzoyl hexyl benzoate);

[0048] 3) A UVA-UVB gap filter (for example, Bemotrizinol); and / or

[0049] 4) A vehicle (for example, ethylhexyl pelargonate or neopentyl glycol diheptanoate).

[0050] In one exemplary embodiment, the manufacturing method for lotion and creams involves forming an aqueous phase containing water-soluble ingredients, such as aloe, terephthalylidene dicamphor sulfonic acid (TDSA) (Ecamsule), Ensulizole, titanium dioxide, and amino acids, such as 5-hydroxy-tryptophan and histidine.

[0051] The method also involves forming an oil phase containing a suitable amount of UVASORB COMPLETE for the desired SPF, as well as oils, emollients, and a suitable amount of EMULSIDERM MPN as an emulsifier, which can be the sole emulsifier.

[0052] One exemplary oil that can be used is Activederm RE, a blend of three oils, namely, Vitamin E Tocotrienols, Oryza Sativa Bran Oil, and Caprylic / Capric Triglycerides. This stable system facilitates the integration of highly potent tocotrienols into personal care products. Odorless, with a light yellow color, Activederm RE leaves no impact on the final formulation's appearance or fragrance.

[0053] Emollients play a role in achieving skin hydration, nourishment, and sensory enhancement, improving the texture and feel of cosmetic products while creating a protective barrier on the skin surface. One of the primary functions of emollients is to moisturize and hydrate the skin. They act as occlusive agents, forming a thin film on the skin’s surface that prevents moisture loss through evaporation. Emollients can be derived from various sources, including natural plant oils, seed extracts, animal fats, silicones, esters, and fatty alcohols. Emollients significantly contribute to the texture and spreadability of the formulation, enhancing its application and absorption. Emollients are known for their ability to improve the stability and shelf life of skin care products. They act as stabilizers, helping to keep the different ingredients in the product well-incorporated, preventing phase separation and maintaining homogeneity.

[0054] The concentration of emollients can vary, but is typically between about 5 and about 45% w / w of the formulation, more typically between about 15 and about 45% w / w of the formulation.

[0055] Butters like shea butter are typically used as moisturizing and emollient ingredients, not as primary sun-blocking agents. While butters may offer some natural sun protection, their SPF values are generally low. For example, shea butter has an approximate SPF of 3-6. Therefore, sunscreens containing butters still need to incorporate recognized UV filters to provide adequate sun protection. The concentration of butters in sunscreen can vary depending on the specific formulation and desired effect, but are typically present in a concentration between about 1 and about 15% w / w.

[0056] Those of skill in the art can readily determine a suitable amount of UVASORB COMPLETE to produce a lotion or cream with a desired SPF value - it is understood that to achieve a higher SPF value, one would need to use more UVASORB COMPLETE than if a lower SPF value is desired. Typically, the amount of UVASORB COMPLETE is up to around 40% w / w.

[0057] Similarly, the amount of emulsifier will vary depending on a number of factors, but is generally within a range of 1-6%. Specific formulations may require adjustments based on factors like the types and concentrations of other ingredients, particularly the UV filters and oils. Those of skill in the art can readily determine an appropriate amount of emulsifier.

[0058] Once the aqueous and oil phases are prepared, they are mixed, ideally using a homogenizer or similar apparatus that provides for high-speed stirring. Sunscreen manufacturing relies on specialized machinery for precise mixing and homogenization, ensuring a stable and effective final product. Common equipment includes high-shear mixers, powder dispersers, vacuum emulsifying mixers, and homogenizers. These tools allow for dispersing active ingredients, emulsifying oil and aqueous phases, and achieving a desired texture and consistency. Optionally, but preferably, a rheology modifier, ideally a liquid rheology modifier, is then added. When the rheology modifier is a liquid, no heating is required, allowing this step to also involve cold processing. In one embodiment, the liquid rheology modifier is RAPIDGEL EZ2. However, in some embodiments, other rheology modifiers are used, or, in still other embodiments, no rheology modifier is used.

[0059] Ideally, the method involves adding a suitable amount of RAPIDGEL EZ2, a liquid rheology modifier, to form an o / w lotion without using any heating step, where the lotion (or cream) has desired properties.

[0060] The exact amount of rheology modifiers needed to mix sunscreen depends on several factors. Various factors can influence the relative amount of rheology modifier desired for a particular product. These include whether the product is intended to be a thin lotion, a thick cream, or a gel.

[0061] Also, the type of rheology modifier can be determined by its compatibility with other ingredients, such as electrolytes, UV filters, and other ingredients that might negatively influence the rheology modifier's effectiveness.

[0062] One benefit of using RAPIDGEL EZ2 is that, in addition to it being a liquid rheology modifier, it is also compatible with both UVASORB COMPLETE and EMULSIDERM MPN, which are also compatible with each other. Although higher or lower amounts can be used, a typical range is between about 0.5 and about 5%, more typically between about 1 and about 4%, and still more typically between about 1 .50 - 3.50 w / w% of RAPIDGEL® EZ2 in a sunscreen formulation. In some embodiments, in addition to or in place of Rapidgel® EZ2, Rapidgel® EZ1 can be used.

[0063] The amount of rheology modifier also depends on the formulation type. Oil-in- water emulsions and water-in-oil emulsions can require different types and amounts of rheology modifiers.

[0064] The amount of rheology modifier also depends on the processing method. Some rheology modifiers, such as RAPIDGEL EZ2, are "cold processable," which can affect formulation ease.

[0065] To achieve a desired viscosity and stability in a sunscreen formulation, it can be important to carefully select an appropriate rheology modifier and determine the optimal concentration through formulation trials and testing, but those of skill in the art, knowing the desired properties of the sunscreen product, can readily determine the appropriate amount of the rheology modifier to use, with no more than routine experimentation.

[0066] Other rheology modifiers that can be used, particularly if a hot processing step is used, include starches (typically used in concentrations between 1 % and 4% w / w in emulsions for stability), tara gum (typically in concentrations between 1 % w / w and 2% w / w), Silicas (like Spheron LP-230, Spheron 20MB, Silica Balloon BA-4, Chiffonsil P3-R), typically at levels between 1 % and 10% w / w, and Oilkemia Alpha POF Polymer (typically used at from 0.3% to 9.0% w / w, depending on the application).

[0067] After mixing the oil and aqueous phases to form an emulsion, other components, such as one or more fragrances and preservatives, can optionally be added.

[0068] In another embodiment, the method involves forming an aqueous phase containing all water-soluble ingredients, and a solid rheology modifier like a carbomer or other suitable rheology modifier. An oil phase containing an amount of UVASORB COMPLETE, as well as one or more oils, emollients, waxes and a suitable emulsifier system (primary, secondary) is then formed. The method then involves bringing the phases to a suitable temperature in order to dissolve fats, waxes, emulsifiers and the like. The aqueous and oil phases are then mixed, then the resulting emulsion (a lotion or cream) is then cooled down. Optionally, one or more fragrances or preservatives can then be added.

[0069] In a third embodiment, the method for manufacturing lotion and cream scaffolds involves adding in order, and mixing well between each addition,:

[0070] 1 ) an amount of deionized water up to complete formula to 100%w / w, typically between around 60% and 90% w / w, and more typically between around 70 and 80% w / w, of the lotion or cream, and;

[0071] 2) an amount of EMULSIDERM MPN from 0.5% w / w up to about 5.00 %w / w;

[0072] 3) an amount of UVASORB COMPLETE up to about 40.00 %w / w;

[0073] 4) homogenizing the mixture, and

[0074] 5) adding an amount of RAPIDGEL EZ2 from 0% w / w up to about 5 %w / w, more typically between about 1% w / w and about 5% w / w. Optionally, one or more fragrances or preservatives can then be added.

[0075] In a fourth embodiment, the method for manufacturing lotions and creams involves: providing an aqueous phase containing all water-soluble ingredients; providing an oil phase containing an amount of UVASORB COMPLETE up to the desired SPF value, as well as one or more oils, emollients, and low melting point butters, mixing the aqueous phase and the oil phase, adding an amount of EMULSIDERM MPN or any other suitable emulsifier system; heating the mixture at a temperature no higher than 40°C so as to melt the low melting point ingredients; mixing the aqueous phase and the oil phase; and adding an amount of rheology modifier to form a w / o lotion.

[0076] Optionally, one or more fragrances or preservatives can then be added.

[0077] In another exemplary method, the steps may include: providing an aqueous phase containing all water-soluble ingredients; providing an oil phase containing an amount of UVASORB COMPLETE, oils, emollients, a low melting point butter, and an amount of EMULSIDERM MPN; heating at about 40°C or below to melt the butter; and optionally adding a preservative, fragrance, or other minor ingredients to form a o / w lotion.

[0078] The compositions and processes described herein will be further described with respect to the following non-limiting examples.

[0079] EXAMPLES

[0080] Example#1

[0081] An example of hot process lotion with a calculated SPF50 is reported. Phase A and B are heated to 80°C in order to solubilize the UV active filters and the waxes / builder. In this example, a traditional carbomer (SYNTHALEN M, a benzene-free synthetic polymer (a 934 type carbomer) from 3V SIGMA USA INC.) is used as rheology modifier and stabilizer. As shown, the heating phase (to 80°C) and the cooling phase (to 40°C) are necessary to build the formula.

[0082] Example#2

[0083] An example of hot process lotion with a calculated SPF30 is reported. Phase A and B are heated to 70°C-75°C in order to solubilize the UV active filters and the waxes / builder. In this example, an efficient liquid rheology modifier (RAPIDGEL EZ1 , INCI Name: PEG-6 (and) AMP-AcrylatesA / inyl Isodecanoate Crosspolymer), from 3V SIGMA USA INC.) is used as rheology modifier and stabilizer. As shown, the heating phase (to 70°-75°C) and the cooling phase (to 40°C) are necessary to build the formula.

[0084] Example#3

[0085] An example of innovative cold-process lotion with a calculated SPF50 is reported. In this example, the use of UVASORB COMPLETE allows the creation of this coldprocess sunscreen lotion, keeping the UV filters soluble and providing an exceptional skin feeling. Furthermore, the liquid cold-processable emulsifier (EMULSIDERM MPN from 3V SIGMA USA INC.) and the liquid cold-processable rheology modifier (RAPIDGEL EZ2, from 3V SIGMA USA INC.) are creating a pleasant and stable emulsion. The enhanced characteristics of Emulsiderm MPN and Rapidgel EZ2 are also due to their emollient capabilities. As shown, no heating phase is necessary to build the formula.

[0086] Example#4

[0087] An example of innovative cold-process lotion with a calculated SPF30 is reported. In this example, the use of UVASORB COMPLETE allows the creation of this coldprocess sunscreen lotion, keeping the UV filters soluble and providing an exceptional skin feeling. Furthermore, the liquid cold-processable emulsifier (EMULSIDERM MPN from 3V SIGMA USA INC.) and the liquid cold-processable rheology modifier (RAPIDGEL EZ2, from 3V SIGMA USA INC.) are creating a pleasant and stable emulsion. The enhanced characteristics of Emulsiderm MPN and Rapidgel EZ2 are also due to their emollient capabilities. As can be seen no heating phase is necessary to build the formula.

[0088] It is possible to tune the SPF of the composition as desired by changing the amount of UVASORB COMPLETE.

[0089] Those skilled in the relevant arts will appreciate from the foregoing description of preferred embodiments that substitutions and modification can be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

WHAT IS CLAIMED IS:1 . A manufacturing method for lotion and creams comprising the steps of: forming an aqueous phase containing water-soluble ingredients; forming an oil phase containing a suitable amount of UVASORB COMPLETE for achieving a desired SPF, oils, emollients, and an amount of EMULSIDERM MPN as sole emulsifier; mixing the aqueous phase and the oil phase; adding an amount of RAPIDGEL EZ2 as liquid rheology modifier to form an o / w lotion without the use of any heating step; and, optionally, adding one or more fragrances or preservatives2. A manufacturing method for lotion and creams comprising the steps of: forming an aqueous phase containing all water-soluble ingredients and a solid rheology modifier like a carbomer or other suitable rheology modifier; forming an oil phase containing an amount of UVASORB COMPLETE, oils, emollients, waxes and a suitable emulsifier system; bringing the phases at a suitable temperature in order to dissolve the fats, waxes, and emulsifiers; mixing the aqueous phase and the oil phase to form a lotion or cream; cooling down the resulting lotion or cream; and, optionally, adding one or more fragrances or preservatives3. A manufacturing method for lotion and creams scaffolds comprising the steps of adding in order, and mixing well between each addition,1 ) an amount of deionized water up to complete formula to 100%w / w;2) an amount of EMULSIDERM MPN from 0% w / w up to about 5.00 %w / w;3) an amount of UVASORB COMPLETE up to about 40.00 %w / w;4) homogenizing the mixture, and5) adding an amount of RAPIDGEL EZ2 from 0% w / w up to about 5 %w / w.

4. A manufacturing method for lotion and creams comprising the steps of: providing an aqueous phase containing all water-soluble ingredients; providing an oil phase containing an amount of UVASORB COMPLETE up to the desired SPF value, oils, emollients, low melting point butters, mixing the aqueous phase and the oil phase, adding an amount of EMULSIDERM MPN or any other suitable emulsifier system; heating the mixture at a temperature of no higher than about 40°C so as to melt the low melting point ingredients; mixing the aqueous phase and the oil phase; adding an amount of rheology modifier to form a w / o lotion.

5. A manufacturing method for lotion and creams comprising the steps of: forming an aqueous phase containing water-soluble ingredients; forming an oil phase containing a suitable amount of UVASORB COMPLETE for achieving a desired SPF, oils, emollients, and an amount of EMULSIDERM MPN as sole emulsifier; mixing the aqueous phase and the oil phase; adding an amount of a rheology modifier to form an o / w lotion; and, optionally, adding one or more fragrances or preservatives6. A manufacturing method for lotion and creams comprising the steps of: forming an aqueous phase containing water-soluble ingredients; forming an oil phase containing a suitable amount of UVASORB COMPLETE for achieving a desired SPF, oils, emollients, and an amount of an emulsifier; mixing the aqueous phase and the oil phase; adding an amount of RAPIDGEL EZ2 to form an o / w lotion; and, optionally, adding one or more fragrances or preservatives.

7. A sunscreen lotion and cream scaffold comprising: a suitable amount of UVASORB COMPLETE to achieve a desired SPF, a suitable amount of an aqueous phase, optionally comprising water-soluble components commonly found in sunscreens, a suitable amount of EMULSIDERM MPN to emulsify the aqueous phase and the UVASORB COMPLETE, and a suitable amount of RAPIDGEL EZ2 to form a lotion or cream.

8. The lotion or cream scaffold of Claim 7, wherein the amount of UVASORB COMPLETE is up to 40% w / w, the amount of EMULSIDERM MPN is between about 0.5% w / w up to about 5.00 %w / w; and the amount of RAPIDGEL EZ2 is between about 1% w / w and about 5% w / w.

9. The lotion or cream scaffold of Claim 7, further comprising one or more fragrances or preservatives.

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