DESC:FIELD OF THE INVENTION
The present disclosure provides an advanced ultraviolet (UV) filter for use in cosmetic and pharmaceutical preparations, which provides unique and superior protection of the skin. The UV filter disclosed herein is a blend of organic and natural compounds that can be used in varying quantities to provide the desired sun protection.
BACKGROUND OF THE INVENTION
Human skin is repeatedly exposed to sun or sunlight, which influences the function and survival of several cell types and is regarded as the main causative of skin cancer, apart from other issues such as melasma, redness, erythema, hyperpigmentation (tanning), charring, wrinkles. These effects are caused typically by exposure of the skin to solar radiation in the ultraviolet A (UVA) and ultraviolet B (UVB) ranges.
UVA ranges from 320-400nm and penetrates through window glass and cloud cover, with a possibility of UVA exposure even indoors. Usually, the exposure to UVA leads to oxidative damage, effect on a basic sites, base modifications and strand breaks. Exposure to this type of ultraviolet radiation causes ageing of the skin, and hence the tag “A”. UVA can penetrate internal layers of the skin, and exposure of the skin typically leads to immediate pigment darkening (IPD), irreversible sun tan, visual wrinkling, pigmentation and DNA damage.
UVB ranges from 320-280nm. The intensity of UVB exposure is high during mid-day. The exposure to UVB leads to cell cycle changes, formation of cyclopyrimidine dimers, mutations and formation of 6-4 photoproducts, leading to skin damage in the form of inflammation and redness, delayed tanning, surface tanning, burning, signs of ageing, which may all last for weeks, because the UVB can penetrate skin epidermis. Exposure to this type of UV radiation causes burning or sun burn, and hence the tag “B”.
In order to avoid such skin damage when a person is out in the sun, sunscreen applications are used. The ability of these sunscreen applications to protect the skin is measured by SPF or Sun Protection Factor. The SPF is therefore a measure of how well the sunscreen will protect the skin from UVA/UVB rays. SPF is measured in vivo on human volunteers, and in vitro by computerised mathematical models. SPF is calculated by dividing the number of seconds it takes a patch of skin to slightly redden when covered with sunscreen, by the number of seconds it takes to slightly redden the skin when it is not covered with the sunscreen. As the SPF value increases, sunburn protection increases.
Sun safety is a year-round responsibility, and finding the right products for daily essential skin care to keep your skin protected is crucial. Currently, apart from SPF, other factors that measure the ability of a sunscreen to protect the skin, include PA rating. PA stands for Protection Grade of UVA, so PA+ ratings measure a product’s ability to block UVA rays. Developed in Japan, the PA rating system was adapted from the Persistent Pigment Darkening (PPD) method. This test uses UVA radiation to cause a persistent darkening or tanning of the skin to determine how long it takes for the skin to tan. However, since PPD does not indicate the exact amount of UVA protection a product provides, this test is converted into a country or region’s scoring system. Only certain countries utilize UVA testing, including Japan, the United Kingdom, Germany, the United States, and Australia. In Japan, PPD results are grouped and simplified into PA measurements.
Based on the conversions, if a product’s PPD is 2 to 4,
then PA=PA+; if a product’s PPD is 4 to 8, then PA = PA++; if a product’s PPD is 8 to 16, then PA = PA+++, and if a product’s PPD is 16 or higher, then PA = PA++++. The protection provided by sunscreens of different SPFs and their PA ratings are summarized in Table 1 below-

Table 1
SPF value PA rating Level of protection Protection from radiation Time for which protection is provided
10 PA+ Low 90% 1-2hrs
15 PA++ Moderate 93% 1-2hrs
30 PA+++ Medium 97% 2hrs
50 PA+++/+ High 98% 2-3hrs
Generally, it takes less time to be exposed to the same amount of sun at mid-day compared to early morning or late evening, because the sun is more intense at midday relative to the other times. In addition to solar intensity, there are a number of other factors that influence the amount of solar energy that a consumer is exposed to, and these include skin type, amount of sunscreen applied and reapplication frequency. Ideally, a single product that provides all these advantages would be the best, i.e. suitable for all skin types, low amount of sunscreen required for protection and less frequency for reapplication.
US20200113798A1 discloses a cosmetic composition including an elastomer, an oil and an organic ultraviolet-screening agent composition, wherein the organic ultraviolet-screening agent composition comprises: at least one liquid organic ultraviolet-screening agent selected from the group consisting of ethylhexyl methoxycinnamate, ethylhexyl salicylate, homosalate, polysilicone-15, and isoamyl p-methoxycinnamate; and at least one solid organic ultraviolet-screening agent selected from the group consisting of ethylhexyl triazone, butyl methoxydibenzoylmethane, bis-ethylhexyloxyphenol methoxyphenyl triazine and diethylamino hydroxybenzoyl hexyl benzoate, wherein a mixing weight ratio of the at least one liquid organic ultraviolet-screening agent to the at least one solid organic ultraviolet-screening agent is a range of 3.5 to 5:1. While this document discloses several UV screening agents, the main objective of the document is to provide transparent sunscreen formulations with no white cast. Also, while it provides the critical wavelength of protection for examples of the invention, there is no disclosure of the specific combination being disclosed here, nor the protective effects disclosed herein.
BASF SE’s patent publications, US9764169B2 and US11793742, disclose UV filter combinations comprising filter agents selected from Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, Diethylhexyl Butamido Triazone, Ethylhexyl Triazone, Diethylamino Hydroxy Benzoyl Hexyl Benzoate, Ethylhexyl Methoxycinnamate, Ethylhexyl Salicylate, Homosalate, along with other UV filter agents in compositions, disclosed therein, for UV protection. The formulations disclosed in these publications comprise use of harmful ingredients such as octocrylene and benzophenone derivatives, specifically benzophenone 3. Octocrylene is known to cause allergic reactions and inflammation of skin, while benzophenone is listed as a potential human carcinogen and endocrine disruptor. Further, the in vitro SPF for a majority of the compositions disclosed in these publications is below 40. The present disclosure provides safer alternatives that have effective sunscreen protection ability with SPF greater than 50, which are neither disclosed nor derivable from the BASF publications.
US9931294 discloses a composition comprising cosmetically acceptable oil, a polyglyceryl fatty acid ester surfactant and a sunscreen active. The document further discloses organic photoprotective agents such as Ethylhexyl Salicylate, Homosalate, Bis(ethylhexyloxyphenol)methoxyphenyl triazine, Diethylhexylbutamidotriazone, and Diethylaminohydroxybenzoylhexyl benzoate. The objective of the invention is not to provide a UV filter agent, but to provide a stable skin care composition that can carry any sunscreen actives and cosmetically acceptable oil. Further, the formulation disclosed in the document comprises use of harmful ingredients such as ß, ß-diphenylacrylate derivatives including octocrylene and benzophenone derivates, including benzophenone 3. Further, there are no details provided on the sun protection factor of the compositions. Nothing herein can motivate, teach or suggest to a skilled person the specific and safe sunscreen protection provided by the specific UV filter blend disclosed herein.
US20110286946A1 discloses a sunscreen composition comprising a sunscreen active and a water resistance agent, for trapping the sunscreen active in the skin. Homosalate, Ethylhexyl methoxycinnamate, diethylamino hydroxybenzoyl hexyl benzoate, ethylhexyl salicylate, ethylhexyl triazone, tetrahydrocurcumin diacetate are disclosed in this document amongst the list of various sunscreen actives that can be used in the sunscreen composition. Apart from the fact that the compositions of US20110286946 contain components that are not environmentally safe and/or that may be harmful to the skin, there is nothing in the publication that provides the sunscreen protection factor of the composition, nor anything to understand its capability to protect skin. It certainly does not provide any disclosure or motivation for preparing the safe and effective sunscreen protection provided by the UV filter blend of the present disclosure.
WO2014015879A2 and WO2014015880A2 disclose sunscreen compositions comprising sunscreen agents selected from Diethylamino hydroxybenzoyl Hexyl Benzoate, Diethylhexyl Butamido Triazone, Ethylhexyl Methoxycinnamate, Homosalate, Ethylhexyl Methoxycinnamate, ethylhexyl salicylate amongst the list of other sunscreen agents that can be used in the composition. These documents also advocate the use of octocrylene and benzophenone derivatives that are harmful to the skin and the environment. Though various sunscreen agents are disclosed, the specific UV filter blend of the present disclosure with SPF greater than 50, and which is safe as regards the environment and the skin, is neither disclosed nor derivable from these publications.
WO2016142616A1 discloses sun-related cosmetic compositions comprising water, oil and a combination of hydrophilic filter and lipophilic filter. Lipophilic filters used in this document include ethylhexyl salicylate, ethylhexyl methoxycinnamate, diethylamino hydroxybenzoyl hexyl benzoate, ethylhexyl triazone, bisethylhexyloxyphenol methoxyphenyl triazine, diethylhexylbutamido triazone and homosalate, amongst other lipophilic filters disclosed therein. The document more specifically provides a sprayable composition in the form of mist, containing a combination of hydrophilic filter and lipophilic filter, with an SPF of at least 10. There is nothing in this disclosure on providing sunscreen compositions that have a higher SPF of greater than 50 and that are safe. There is certainly nothing therein to suggest the specific UV filter blend of the present disclosure.
WO2016209695A1 discloses sunscreen compositions having a synergistic combination of ultraviolet light filtering agents that provide a high Sun Protection Factor. It comprises a combination of the following UV filters – butyl methoxydibenzoylmethane, ethylhexyl triazone, drometrizole trisiloxane, homosalate, ethylhexyl salicylate, octocrylene, and terephthalylidene dicamphor sulfonic acid. The formulation disclosed in the document comprises use of harmful ingredients such as octocrylene, which are known to cause allergic reactions and inflammation to skin. However, it does not disclose or suggest the specific UV filter blend of the present disclosure.
WO2021102113A1 discloses a UV filter composition comprising: three UV-B filters, a UV-A filter, and a UV-A + UV-B broadband filter. Specifically, the document discloses that UV-A filter consists of Butyl methoxydibenzoylmethane, UV-B filter is selected from Ethylhexyl triazone, octyl salicylate, diethylhexyl butamido triazone, and the broad band UV-A and UV-B filter consists of bis-ethylhexyloxyphenol methoxyphenyl triazine. Further, three UV-B filters are independently chosen from ethylhexyl dimethyl PABA, ethylhexyl methoxycinnamate, ethylhexyl salicylate, homosalate, octocrylene, PABA, and phenyl benzimidazole sulfonic acid. Nothing herein teaches the specific UV filter blend of the current disclosure.
WO2010043588A1 discloses the use of UV absorbers such as ethylhexyl salicylate, ethylhexyl methoxycinnamate, diethylamino hydroxybenzoyl hexyl benzoate, ethylhexyl triazone, bisethylhexyloxyphenol methoxyphenyl triazine, diethylhexylbutamido triazone and homosalate. Specifically, this document provides compositions for UV protection that are water-resistant. The document also discloses a combination of UV screening agents and a terpolymer, along with other cosmetically acceptable ingredients, but does not in any way disclose the UV filter blend of the current disclosure, or the high sun protection provided.
WO2020172726A1 discloses an anti-acne sunscreen composition comprising an anti-acne system, comprising salicylic acid and at least one additional anti-acne ingredient, an UV filter system, and a stabilizing polymer system, wherein the UV filter system is selected from phenylbenzimidazole sulfonic acid, butyl methoxydibenzoylmethane, titanium dioxide, ethylhexyl triazone, terephthalylidene dicamphor sulfonic acid, octocrylene, homosalate, bis-ethylhexyloxyphenol methoxyphenyl triazine, silica (and) titanium dioxide, methylene bis-benzotriazolyl tetramethylbutylphenol (and) polyglyceryl 10 laurate and combinations thereof. The specific UV filter blend of the current disclosure is not provided by this publication.
Gelyma, a French company has developed a sunscreen composition, which is marketed under the brand name SUN’ALG (See https://www.ulprospector.com/en/asia/PersonalCare/Detail/102443/555083/SUNALG). The composition contains a combination of Pongamia glabra seed oil with microalgal extracts. It is able to reinforce the skin’s defence mechanisms by up regulating various genes involved in the oxidative stress, DNA repair, the antimicrobial defence and the reinforcement of the barrier function. Additionally, SUN’ALG requires the use of gelling agents such as carbopol gel to provide maximum sunscreen protection. Similarly, Korean patent application KR102093201B1 discloses the use of combination of Pongamia glabra seed oil with tamanu oil for sunscreen protection. However, a major issue with such compositions is low SPF, as seen in document KR102093201B1.
As evident from the prior art, given the large number of compounds that exist and can function as UV screening agents, it would not be obvious to a skilled person in the art to select specific compounds to provide a UV filter blend that has a high SPF and superior PA ratings, while providing a broad spectrum of protection from UVA and UVB radiation, and which is safe to the skin as well as the environment. Further, it is to be emphasized that none of the documents teach or motivate or suggest a skilled person to prepare a blend that includes a combination of organic and natural products used in the UV filter blend of the current disclosure.
The current expectation of a sunscreen for skincare products is that it should be multifunctional, safe, easy to use, should contribute to skin repair, should have anti-ageing and anti-acne effects, should have skin brightening ability, must have natural products, and finally, should be useful across various skin types, including in men’s grooming products. As evident from the prior art, typically used UV filtering ingredients in currently available sunscreen and skincare products – oxybenzone and octinoxate – are chemicals that are water soluble, and have been linked to bleaching of the corals. Thus, use of the currently used UV filtering ingredients could inadvertently lead to damage to the coral reefs and other natural flora and fauna. The development of environmentally safe UV filters is important, and the present inventors have made an effort to develop a UV filter blend that uses natural ingredients and strives to reduce the damage caused to the environment.
Environmentally safe products are the need of the hour, and various geographies have put forth regulatory guidances with respect to maximum usage of the ingredients in sunscreen products, or as UV filters, so as to ensure maintenance of environmental safety. Table 2 below summarizes the current worldwide regulatory guidelines for some of the approved UV filter ingredients.
Table 2
Product* Maximum usage concentration (%)
EU CN US AU CA JP IN ZA ASIAN Mercosur
Salisol BMZ 10 10 - 10 - 3 10 - 10 10
Salisol OMC 10 10 10 10 10 10 10 10 10 10
Salisol OS 5 5 5 5 5 10 5 5 5 5
Salisol AB 5 5 3 5 3 10 5 5 5 5
Salisol 3 10 10 8 10 6 5 10 10 10 10
Salisol 4 5 5 10 10 10 10 5 10 5 10
Salisol HS 8 8 4 4 4 3 8 8 8 8
Salisol HMS 10 10 15 15 15 10 10 10 10 15
Salisol CRY 10 10 10 10 10 10 10 10 10 10
Salisol EHT 5 5 5 5 5 10 5 5 5 5
Salisol DHHB 10 10 - 10 - 10 10 10 10 -
Salisol HEB 10 10 - - - 10 10 - 10 -
EU = Europe; CN = China; US = USA; AU – Australia; CA = Canada; JP = Japan; IN = India; ZA = South Africa; Salisol BMZ = Bis-ethylhexyloxyphenol methoxyphenyl triazine; Salisol OMC = ethylhexyl methoxycinnamate; Salisol OS = ethylhexyl salicylate; Salisol AB = butylmethoxydibenzoylmethane; Salisol 3 = benzophenone-3’ Salisol 4 = benzophenone -4; Salisol HS = phenylbenzimidazole sulfonic acid; Salisol HMS == homosalate; Salisol CRY = octocrylene; Salisol EHT = ethylhexyl triazone; Salisol DHHB = diethylamino hydroxybenzoyl hexylbenzoate; Salisol HEB = diethylhexyl butamido triazone
Given this guidance, it is clear that various geographies have different limitations on the same ingredient, thereby making it difficult to develop a product that will be globally acceptable, while still providing the desired level of sun protection. As a result, a globally acceptable product will require the use of various permutations and combinations of UV filters, and their quantities, while still trying to achieve a broad-spectrum UV filter with effective protection against UVA and UVB. Further, compatibility with active ingredients and extracts of natural products that may be present in the skincare products is also an important requirement. Solubility of the final blend of UV filters that will be used is extremely important as well, because water soluble UV filter blends could be easily washed off, including by sweat, and will lead to ineffective protection. Further, it is also important to have solubility such that the UV filter blend is miscible with formulations, is washable and does not cause recrystallization or precipitation of the UV filters that may be used. The UV filter must have a balance between the sensory performance and the protection efficiency, and must not cause photoreactions and/or discolorations. Finally, and equally important, the UV filters should solubilise at certain low temperatures, and cannot be ones that require high temperature for solubilisation. There is also a need for components in the UV filter that can aid in cell renewal, by acting as exfoliants to remove dead, damaged, burnt and/or tanned skin. With these requirements and expectations, it is evident that achieving the right SPF and PA rating, along with the right feel, is not at all a matter of routine work, nor is it obvious to combine the known UV filters to obtain the product with an expectation of achieving the desirable properties.
Economic viability of the blend is also a critical factor, and must be achieved while still achieving the SPF, PA-rating and other skin benefits. A person of skill cannot predict the SPF and PA-ratings of a product, nor its properties, by merely combining UV filters known in the art, such as those listed in Table 2 and the prior art discussed above, given the large number of compounds that exist and can function as UV filters.
Therefore, there exists a need in the art for a unique, advanced UV filter blend with a broad spectrum of sun protection and with superior skin protection.
OBJECTIVE OF THE INVENTION
It is an object of the invention to provide a globally acceptable, broad spectrum UV filter blend with sun protection against UV-A and UV-B radiations, having a SPF greater than 50 and a PA rating of PA+++. Further, it is an object of the present invention to provide a broad spectrum UV filter blend with sun protection against UV-A and UV-B radiations, having a SPF greater than 50 and a PA rating of PA+++, at 25% use.
Another object of the invention is to provide an environmentally friendly UV filter blend comprising natural ingredients.
Yet another object of the invention is to provide a UV filter blend that is skin friendly and free of preservatives and other harmful ingredients.
Further object of the invention is to provide a UV filter blend imparting anti-ageing, brightening and/or emollient properties to the skincare, cosmetic or pharmaceutical preparation in which it may be incorporated.
Still further object of the invention is to provide a UV filter blend that is highly compatible with emulsifiers, fragrances, oils and actives used in skincare, cosmetic and pharmaceutical preparations.
Another object of the invention is to provide a sunscreen composition which has less frequency for reapplication.
These and other objects and advantages if the invention will be apparent from the ensuing description.
SUMMARY OF THE INVENTION
The present disclosure provides an Ultraviolet (UV) filter blend comprising a combination of the components – diethylamino hydroxybenzoyl hexylbenzoate, diethylhexyl butamido triazone, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl methoxycinnamate, ethylhexyl triazone and ethylhexyl salicylate, wherein the individual components are present in amounts such that at 25% use, the UV filter blend has a Sun Protection Factor greater than 50 and a Protection grade of UV A rating of PA+++.
The UV filter blend of the present disclosure comprises –
(i) Diethylamino hydroxybenzoyl hexylbenzoate in a concentration of about 1 % to about 10 % by weight relative to the total weight of the UV filter blend;
(ii) Diethylhexyl butamido triazone in a concentration of about 1 % to about 10 % by weight relative to the total weight of the UV filter blend;
(iii) Bis-ethylhexyloxyphenol methoxyphenyl triazine in a concentration of about 1 % to about 10 % by weight relative to the total weight of the UV filter blend;
(iv) Ethylhexyl methoxycinnamate in a concentration of about 5 % to about 10 % by weight relative to the total weight of the UV filter blend;
(v) Ethylhexyl triazone in a concentration of about 1 % to about 5 % by weight relative to the total weight of the UV filter blend;
(vi) Ethylhexyl salicylate in a concentration of about 1 % to about 10 % by weight relative to the total weight of the UV filter blend.
The UV filter blend of the present disclosure may further comprise homosalate in a concentration of about 5 % to about 15 % by weight relative to the total weight of the UV filter blend.
The UV filter blend of the present disclosure may further comprise –
(i) Capryloyl salicylic acid in a concentration of about 1 % to about 2 % by weight relative to the total weight of the UV filter blend;
(ii) Pongamia glabra seed oil in a concentration of about 1 % to about 2% by weight relative to the total weight of the UV filter blend; and
(iii) Tetrahydrocurcumin in a concentration of about 0.5 % to about 1 % by weight relative to the total weight of the UV filter blend.
In one embodiment of the present disclosure, the UV filter blend contains diethylamino hydroxybenzoyl hexylbenzoate, diethylhexyl butamido triazone, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl methoxycinnamate, ethylhexyl triazone and ethylhexyl salicylate, homosalate, Capryloyl salicylic acid, Pongamia glabra seed oil and Tetrahydrocurcumin.
DETAILED DESCRIPTION OF THE INVENTION
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Unless the context indicates otherwise, it is specifically intended that the various features of the invention described herein can be used in any combination.
Moreover, the present invention also contemplates that in some embodiments of the invention, any feature or combination of features set forth herein can be excluded or omitted.
All publications, patent applications, patents, and other references mentioned herein are incorporated by reference herein in their entirety for all purposes.
As used herein, “a,” “an,” or “the” can mean one or more than one.
The term “comprising”, which is synonymous with “including”, “containing”, or “characterized by” herein defined as being inclusive or open-ended and does not exclude additional, unrecited elements or method steps, unless the context clearly requires otherwise.
The term “about” is used herein to mean approximately, in the region of, roughly, or around. When the term “about” is used in conjunction with a numerical range, it modifies that range by extending the boundaries above and below the numerical values set forth. In the context of the present disclosure, the term “about” means within 20%, such as for example within 15%, 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0.1%, or 0.05%, of a given value or range.
The term composition(s), product(s), preparation(s) and formulation(s) have been used interchangeably.
The term “component” as used herein refers to the individual constituents used to obtain the UV filter blend of the present disclosure.

The term "blend", as used herein, refers to a mixture or combination of different substances, elements, or components. In various contexts, blending involves the process of combining two or more ingredients, materials, or entities to create a unified or homogenous mixture. In the context of the present disclosure, “blend” refers to “Ultraviolet (UV) Filter blend” which is a combination of specific UV filter agents capable of absorbing or blocking UVA and UVB radiations in the range of about 280n to about 400 nm.

The term “organic compounds” includes carbon containing compounds for screening out the UV radiations, Similarly, the term “natural” includes compounds that are derived naturally, i.e. via living organisms, including plants and plant products, and that have the ability to screen out the UV radiations.
The term “broad spectrum UV filters” implies agents that are capable of providing protection to the skin against both UVA and UVB radiations.
The term “Sun Protection Factor” (SPF) is a measure of degree of protection of the skin offered by the sunscreen, against UV rays. SPF is a measure of the ultraviolet solar energy required to produce sunburn on skin treated with sunscreen, relative to the amount of solar energy required to produce sunburn on unprotected skin. As the SPF rating of a sunscreen product increases, the sunburn protection increases.
The term “PA+” is a UV protection grading system in Asian countries and refers to Protection Grade of UVA. It measures a product’s ability to block UVA rays based on PPD. The term “PPD” refers to Persistent Pigment Darkening, and measures how protective the sunscreen is against a long-term tan caused by UVA, by the ratio of minimum radiation dose on sunscreen-treated skin and minimum dose on unprotected skin.
The present disclosure provides a UV filter blend that has broad spectrum of protection against both UVA and UVB radiation, having a SPF greater than 50 and a PA rating of PA+++, at 25% use.
Accordingly, the present disclosure provides an Ultraviolet (UV) filter blend comprising a combination of the components – diethylamino hydroxybenzoyl hexylbenzoate, diethylhexyl butamido triazone, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl methoxycinnamate, ethylhexyl triazone, ethylhexyl salicylate, and/or homosalate, and optionally at least one of the components selected from a group comprising capryloyl salicylic acid, oil of Pongamia glabra seed and tetrahydrocurcumin, wherein the individual components are present in amounts such that at 25% use, the UV filter blend has a Sun Protection Factor greater than 50 and a Protection grade of UVA rating of PA+++.
In one embodiment, the UV filter blend of the present disclosure includes a combination of diethylamino hydroxybenzoyl hexylbenzoate, diethylhexyl butamido triazone, homosalate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl methoxycinnamate, ethylhexyl triazone, and ethylhexyl salicylate, in amounts such that at 25% use, the UV filter blend has a SPF greater than 50 and a PA rating of PA+++.
In a preferred embodiment, the UV filter blend of the present disclosure includes a combination of diethylamino hydroxybenzoyl hexylbenzoate, diethylhexyl butamido triazone, homosalate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl methoxycinnamate, ethylhexyl triazone, ethylhexyl salicylate, capryloyl salicylic acid, Pongamia glabra seed oil and tetrahydrocurcumin, in amounts such that at 25% use, the UV filter blend has a SPF greater than 50 and a PA rating of PA+++.
In another embodiment, the UV filter blend of the present disclosure includes a combination of diethylamino hydroxybenzoyl hexylbenzoate, diethylhexyl butamido triazone, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl methoxycinnamate, ethylhexyl triazone, and ethylhexyl salicylate, in amounts such that at 25% use, the UV filter blend has a SPF greater than 50 and a PA rating of PA+++.
In another preferred embodiment, the UV filter blend of the present disclosure includes a combination of diethylamino hydroxybenzoyl hexylbenzoate, diethylhexyl butamido triazone, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl methoxycinnamate, ethylhexyl triazone, ethylhexyl salicylate, capryloyl salicylic acid, Pongamia glabra seed oil and tetrahydrocurcumin, in amounts such that at 25% use, the UV filter blend has a SPF greater than 50 and a PA rating of PA+++.
All the individual components used in the UV filter blend of the present disclosure provide unique properties, and together provide synergy in providing protection to the skin.
Diethylamino hydroxybenzoyl hexylbenzoate, available as Salisol DHHB, protects the skin from damaging UVA rays of the wavelength 320-400nm, that accelerate skin ageing. In one embodiment of the present disclosure, diethylamino hydroxybenzoyl hexylbenzoate is present in a concentration of about 1 % to about 10 % by weight, relative to the total weight of the UV filter blend. In a preferred embodiment, diethylamino hydroxybenzoyl hexylbenzoate is present in a concentration of about 4% to about 7% by weight, relative to the total weight of the UV filter blend.
Diethylhexyl butamido triazone, also known as Iscotrizinol and commercially available as Salisol HEB, absorbs UVB rays of wavelength 280-320nm. In one embodiment of the present disclosure, diethylhexyl butamido triazone is present in a concentration of about 1 % to about 10 % by weight, relative to the total weight of the UV filter blend. In a preferred embodiment, diethylhexyl butamido triazone is present in a concentration of about 5% to about 6% by weight, relative to the total weight of the UV filter blend.
Bis-ethylhexyloxyphenol methoxyphenyl triazine, commercially available as Salisol BMZ, is a broad-spectrum UV absorbent that absorbs UVA and UVB rays of the wavelength 280-400nm, and works well with other oil soluble UV filters to provide high SPF value. In one embodiment of the present disclosure, bis-ethylhexyloxyphenol methoxyphenyl triazine is present in a concentration of about 1 % to about 10 % by weight, relative to the total weight of the UV filter blend. In a preferred embodiment, bis-ethylhexyloxyphenol methoxyphenyl triazine is present in a concentration of about 2% to about 7% by weight, relative to the total weight of the UV filter blend. In a more preferred embodiment, bis-ethylhexyloxyphenol methoxyphenyl triazine is present in a concentration less than 4% by weight relative to the total weight of the UV filter blend.
Ethylhexyl methoxycinnamate, commercially available as Salisol OMC and also known as Octinoxate, works to protect against skin damage caused by UVB rays. In one embodiment of the present disclosure, ethylhexyl methoxycinnamate is present in a concentration of about 5% to about 10% by weight relative to the total weight of the UV filter blend. In a preferred embodiment, it is present in a concentration of about 7% by weight relative to the total weight of the UV filter blend.
Ethylhexyl triazone, commercially known as Salisol EHT, absorbs UVB rays of the wavelength 280-320nm. In an embodiment of the present disclosure, ethylhexyl triazone is present in a concentration of about 1% to about 5% by weight, relative to the total weight of the UV filter blend. In a more preferred embodiment, ethylhexyl triazone is present in a concentration of about 5% by weight, relative to the total weight of the UV filter blend.
Ethylhexyl salicylate, available as Salisol OS and also known as Octisalate, is an effective UV absorber in the wavelength of 295-315nm, and also helps reduce photodegradation of other sunscreen ingredients. In an embodiment of the present disclosure, ethylhexyl salicylate is present in a concentration of about 1% to about 10% by weight, relative to the total weight of the UV filter blend. In a more preferred embodiment, ethylhexyl salicylate is present in a concentration of about 5% by weight, relative to the total weight of the UV filter blend.
Homosalate, commercially available as Salisol HMS, specifically absorbs short-wave UVB rays that are associated with DNA damage. It also contributes to the overall texture, spreadability and feel of the formulation. In one embodiment of the present disclosure, homosalate is present in a concentration of about 5% to about 15% by weight, relative to the total weight of the UV filter blend. In a preferred embodiment, homosalate constitutes about 5% to about 10% by weight, relative to the total weight of the UV filter blend. In a highly preferred embodiment, homosalate constitutes about 7% by weight, relative to the total weight of the UV filter blend.
Capryloyl Salicyclic Acid, commercially available as Salicap CSA, is used in the UV filter blend as an exfoliant, anti-inflammatory and anti-septic agent, and also to reduce fine lines and wrinkles, as it helps maintain skin elasticity. Capryloyl salicyclic acid also helps in skin brightening and is helpful in acne, as it has anti-comedogenic activity. In one embodiment of the present disclosure, capryloyl salicylic acid is present in a concentration of about 1% to about 2% by weight, relative to the total weight of the UV filter blend.
Pongamia glabra seed oil, commonly known as Karanja seed oil and commercially available as Salinatural KJ, is an odorless natural product that boosts the SPF, and has excellent anti-oxidant and emollient properties. In an embodiment of the present disclosure, Pongamia glabra seed oil is present in a concentration of about 1% to about 2% by weight, relative to the total weight of the UV filter blend.
Tetrahydrocurcumin, which is color-free, unlike conventional turmeric extracts, is used as a natural skin whitening agent in the UV filter blend of the present disclosure. In one embodiment of the present disclosure, Tetrahydrocurcumin is present in a concentration of about 0.5% to about 1% by weight, relative to the total weight of the UV filter blend.
These components together help provide a UV filter blend that has unique and beneficial properties for superior skin protection, wherein the blend has Sun Protection Factor (SPF) greater than 50, and a Protection grade of UVA rating of PA+++, at 25% use.
In an embodiment, the UV filter blend of the present disclosure is a light-yellow liquid that is oil soluble and has a viscosity in the range of about 2000cps to about 2500cps.
In the context of the present disclosure, “sunscreen composition" implies any cosmetic or pharmaceutical product comprising agents or components that reduce the amount of UV radiation being absorbed by the skin, by blocking UVA and UVB radiations, when said sunscreen composition is applied to the skin.

In one embodiment of the present disclosure, a sunscreen composition comprising the UV filter blend in a range of about 5% to about 30% by weight, relative to the total weight of the sunscreen composition, is provided. The sunscreen composition is selected from the group comprising cosmetic and pharmaceutical products. Cosmetic products are products intended to be applied to the human body for cleansing, beautifying, promoting attractiveness, or altering the appearance without affecting the body's structure or functions, and are alternatively known as skincare compositions. Pharmaceutical products include any product intended for use in the diagnosis, cure, mitigation, treatment or prevention of disease” and “articles (other than food) intended to affect the structure or any function of the body of man or other animals. The UV filter blend of the present disclosure may be used in compositions that may be in the form of solutions, emulsions, milks or oils, and may be applied to the skin by means of cream, stick, gel, oil, butter, spray, powder, lotion, paste, ointment and other skincare compositions typically used in the art. The UV filter blend of the present disclosure, when used in sunscreen compositions, helps protect the skin from sun damage when applied topically to the skin.
Upon blending with the skincare or cosmetic compositions, the UV filter blend of the present disclosure provides protection against UVA and UVB rays, absorbs quickly, is non-sticky and does not leave a white cast. The UV filter blend can be effectively used in oil-in-water and water-in-oil emulsions to formulate sunscreen products that may be in the form of creams, lotions, sunscreen sticks, anti-ageing creams, post-sun serums, oils, sports sunscreens, hair coloring agents and other cosmetic and skincare preparations. The UV filter blend can be used in various products. Non-limiting examples include sunscreens, anti-ageing creams, post-sun serums, oils, sports sunscreens, hair coloring agents and other cosmetic and skincare preparations. The sunscreen composition may optionally comprise other cosmetic actives, obvious to those skilled in the art including, but not limited to, fillers, oils, emulsifiers, antioxidants, surfactants, film formers, chelating agents, gelling agents, thickeners, emollients, humectants, moisturizers, vitamins, minerals, viscosity and/or rheology modifiers, sunscreens, keratolytics, depigmenting agents, retinoids, hormonal compounds, alpha- hydroxy acids, alpha-keto acids, anti-mycobacterial agents, antifungal agents, antimicrobials, antivirals, analgesics, lipidic compounds, anti-allergenic agents, HI or H2 antihistamines, anti-inflammatory agents, anti-irritants, antineoplastics, immune system boosting agents, immune system suppressing agents, anti-acne agents, anesthetics, antiseptics, insect repellents, skin cooling compounds, skin protectants, skin penetration enhancers, exfoliants, lubricants, fragrances, colorants, depigmenting agents, hypo pigmenting agents, preservatives, stabilizers, pharmaceutical agents, photostabilizing agents, neutralizers and mixtures thereof. In addition to the foregoing, the cosmetic compositions of the invention may contain any other compound for the treatment of skin disorders. The UV filter blend is compatible with most actives used in skincare, cosmetic and pharmaceutical products.
Estimation of Sun Protection Factor (SPF) is crucial to determine the efficacy of the UV filter blend. It is conventional in the art to use BASF Sunscreen Simulator for theoretically estimating SPF, which serves as a recognized tool in the industry. The simulator helps users to digitally simulate the UV protection of a new formulation, without having to do the hard work in the laboratory, thereby reducing costs for necessary in vivo tests, and helping predict the properties of the proposed product. The simulator can theoretically predict the SPF, and therefore the PA ratings, of any product or a proposed combination of products that will act as UV filters. Therefore, a person of skill could have used the Simulator to find the SPF of any blend of known UV filters.
However, it would not be obvious to select the specific components being used in the UV filter blend of the present disclosure, and the probability of selecting these specific components to provide a blend that has a high SPF and superior PA rating would be very low, given the large number of compounds that exist and can function as UV filters. Further, it would not be common, nor obvious, to prepare a blend that includes a combination of organic and natural products. Also, the superior skincare properties that the blend provides, such as skin brightening, emollient action, anti-ageing, suitability for all skin types (especially oily skin and skin with acne), while providing a broad spectrum of protection from UVA and UVB radiation, would not be expected or predictable.
The UV filter blend of the present disclosure includes components that maintain a UVA:UVB balance of 1:3. Because UVB causes surface damage of the skin, there is a need for inclusion of higher amount of components that protect from UVB radiations. This has been achieved in the UV filter blend of the present disclosure. Further, it must be noted that the UV filter blend of the present disclosure provides revolutionary sun defense in that more than double SPF boost is seen with 1% use, i.e. 1% use provides SPF of 2 or more, and as is exemplified below, 25% use provides SPF of greater than 50. While the UV filter blend of the present disclosure may be used at 25% to benefit from its high SPF and PA rating, when used at lower amounts, it still achieves SPF values that provide reasonably good sun protection. For example, at 11.3% use a SPF value of 25 is achieved; at 13.6% use, the SPF achieved is 30; and at 18.2% use the SPF achieved is 40. It is understood that use of lower amounts would have lower SPF values and vice versa, but nevertheless the blend provides sun protection and other skin benefits attributable to the components present in the blend.
The SPF for the UV filter blend of the current disclosure is measured by the globally accepted Colipa method, which is an in vitro estimation of SPF and PA rating. The test is based on the assessment of UV transmittance through a thin film of sunscreen sample spread on a roughened substrate, before and after exposure to a controlled dose of radiation from a defined UV exposure source. Because of the several variables that cannot be controlled with typical thin film spectroscopic techniques, each set of sunscreen transmission data is mathematically adjusted so that the in vitro SPF data yields the same measured in vivo SPF value that was determined by in vivo testing.
The UV-2000S method is based on the spectral transmittance of ultraviolet light through a sunscreen material. The term spectral transmittance refers to the fraction of light transmitted at a single wavelength. The UV-2000S instrument measures spectral transmittance across the 250 - 450 nm wavelength spectrum using an integrating sphere and two spectrometer instruments. The sample beam is generated inside the integrating sphere by an ultraviolet pulsed flash lamp.
Most sunscreen manufacturers use the in vitro method similar to the UV light test performed by the UV-2000S to accelerate new product development, decrease in-vivo product test cycles and cost, and to verify lot-to-lot manufacturing consistency. UV-2000 calculates the SPF characteristic according to the following ratio –

where E? is the erythema action spectrum, S? is the solar spectral irradiance, T? is the spectral transmittance of the sample with the integral is calculated across the 290-400 nm wavelength limits.
The critical wavelengths observed by UV-2000S are indicative of the sun protection spectrum of the sunscreen. The term “critical wavelength” is the wavelength at which the sunscreen allows 10% of the rays to penetrate. The critical wavelengths observed in this test are indicative of the sun protection spectrum of the sunscreen. For the UV blend of the present disclosure, two critical wavelengths were found at ?max of 224nm and 334nm, indicating ability to protect from UVA and UVB radiation. Thus, the UV filter blend of the present disclosure has a broad spectrum of protection.
Therefore, the UV filter blend of the present disclosure has the advantage of being an easy to use, single product that navigates regulatory landscapes effortlessly, and which is a versatile solution for a range of skin concerns. The UV filter blend of the present disclosure provides a broad-spectrum sunscreen agent that provides holistic protection from UVA and UVB radiation, provides skin radiance and skin repair, and is an easy-to-use single product that also provides anti-ageing benefits. Since it packs in these multiple benefits in a single product, it is an economically viable option that is versatile, time saving, cost effective and sustainable in nature. It must also be emphasized that the UV filter blend of the present disclosure is economically highly viable. A person skilled in the art will appreciate that the blend provides unique and superior properties and yet is relatively inexpensive.
The present invention is further illustrated by reference to the following examples which are for illustrative purpose only and do not limit the scope of the invention in any manner.
EXAMPLES
Example 1
Table 3
Phase Ingredients Quantity (%)
A Homosalate (Salisol HMS) 7
Bis-ethylhexyloxyphenol methoxyphenyl triazine (Salisol BMZ) 7
Diethylamino Hydroxybenzoyl hexyl Benzoate (Salisol DHHB) 4
Diethylhexyl butamido triazone (Iscotrizonol or Salisol HEB) 6
Ethylhexyl salicylate (Salisol OS or Octisalate) 5
Ethylhexyl triazone (Salisol EHT) 5
Ethylhexyl methoxycinnamate (Salisol OMC or Octinoxate) 7
B Pongamia glabra Seed Oil (Salinatural KJ) 1
Capryloyl Salicyclic Acid (Salicap CSA) 1
Tetrahydrocurcumin (Salinate (P) TETRA) 0.5

A UV filter blend containing ingredients disclosed above in Table 3 was prepared as described below. The components of Phase A above were weighed and taken in main vessel. These were then heated to 65oC to 70oC, until it all dissolved. Phase B components were then added with continuous heating and mixed with slow stirring. The mixture was then allowed to cool room temperature to obtain the final UV filter blend.
Example 2
Table 4
Phase Ingredients Quantity (%)
A Bis-ethylhexyloxyphenol methoxyphenyl triazine (Salisol BMZ) 6
Diethylamino Hydroxybenzoyl hexyl Benzoate (Salisol DHHB) 7
Diethylhexyl butamido triazone (Iscotrizonol or Salisol HEB) 5
Ethylhexyl salicylate (Salisol OS or Octisalate) 5
Ethylhexyl triazone (Salisol EHT) 5
Ethylhexyl methoxycinnamate (Salisol OMC or Octinoxate) 7
B Pongamia glabra Seed Oil (Salinatural KJ) 2
Capryloyl Salicyclic Acid (Salicap CSA) 2
Tetrahydrocurcumin 1

A UV filter blend containing ingredients disclosed above was prepared by a process similar to that described for Example 1 above.
Example 3
The BASF Simulator was used to calculate the SPF of the UV filter blend of Example 1 at 1% use, and it was theoretically found to be 1.62. Thus, at 25% use the SPF is expected to be around 40.5, theoretically.
The UV filter blend of Example 1 was also subjected to SPF testing by the in vitro Colipa method, described herein above. The critical wavelength was found to be 373.91nm, indicating a SPF of 54.92 and a PA rating of PA+++ at 25% use, thereby indicating that the UV filter blend has a broad spectrum of sun protection. (Note that the BASF Simulator calculates the SPF using 1.5mg/cm2 application amount, while the Colipa method uses 1.3mg/cm2.)
Thus, the actual SPF value for the UV filter blend of Example 1 (54.92) was surprisingly significantly higher than the value predicted by the BASF Simulator. This was totally unexpected and unpredictable.
Example 4
The BASF Simulator was used to calculate the SPF of the UV filter blend of Example 2 at 1% use, and it was theoretically found to be 1.74. Thus, at 25% use the SPF is expected to be around 43.5, theoretically.
The UV filter blend of Example 2 was also subjected to SPF testing by the in vitro Colipa method, described herein above. The critical wavelength was found to be 377.4nm, indicating a SPF of 56.82 and a PA rating of PA++++ at 25% use, thereby indicating that the UV filter blend has a broad spectrum of sun protection. (Note that the BASF Simulator calculates the SPF using 1.5mg/cm2 application amount, while the Colipa method uses 1.3mg/cm2.)
Thus, the actual SPF value for the UV filter blend of Example 2 (56.82) was surprisingly significantly higher than the value predicted by the BASF Simulator (43.5). This was totally unexpected and unpredictable.

Example 5
Table 5
Ingredients UV filter blend formulation 1
(Quantity %) UV filter blend formulation 2
(Quantity %) UV filter blend formulation 3
(Quantity %)
Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine 10 5 3
Diethylamino Hydroxybenzoyl Hexyl Benzoate 2 10 9
Diethylhexyl Butamido Triazone 2 10 9
Ethylhexyl Methoxycinnamate 10 5 9
Ethylhexyl Salicylate 5 1 5
Ethylhexyl Triazone 5 2 3
Homomenthyl Salicylate 10 8 5
SPF at 2 mg/cm2 87.8 87.5 87
SPF at 1.3 mg/cm2 65.3 65.9 65.5
A UV filter blend containing ingredients disclosed above in Table 5 was prepared by a process similar to that disclosed in examples 1 and 2 above. The components were weighed and taken in main vessel. These were then heated to 65oC to 70oC, until it all dissolved. The mixture was then allowed to cool to room temperature to obtain the final UV filter blend.
The BASF Simulator was used to calculate the SPF of the UV filter blends of Example 5 using 2 mg/cm2 and 1.3mg/cm2 application amount. The SPF for each formulation is disclosed in Table 5 above.

Example 6
A sunscreen cream formulation containing the UV filter blend of Example 1 was prepared as follows –
Table 6
Phase Ingredients Quantity (%)
Cetyl Alcohol 3.5
Potassium cetyl phosphate, Behenyl Alcohol 1
A Steareth-2 2
Caprylic Capric Triglyceride 2
UV filter Blend of Example 1 25
Glycol Monostearate 1.5
Allantoin 0.5
Disodium EDTA 0.05
B Ethylhexylglycerin,1,3-Propanediol (Saliguard EZ) 1
DM Water Q.S 100
Sodium PCA (Salilite SOPCA) 1
C Lilac (C14-22 Alkane) 2
D Lactic Acid, Gluconolactone,1,2 Hexanediol (Saliguard LAG) 1
Coconut Eunice 0.5

The ingredients listed in phase A were weighed in a main vessel and heated upto about 70oC. Thereafter, phase B ingredients were weighed in another vessel and heated upto about 70oC. Phase B ingredients were then added to Phase A ingredients with continuous mixing using a homogenizer to obtain a mixture. Phase C and D ingredients, maintained at a temperature of about 40oC, were then added to the final mixture to obtain the face cream formulation.
Determination of SPF, PA rating and critical wavelength of Sunscreen cream formulation:
(i) A sunscreen cream formulation containing the UV filter blend of Example 1, but without the Pongamia glabra Seed Oil (Salinatural KJ) in Phase B of the filter blend, was prepared as per the ingredients mentioned in Table 6 above. The formulation was then subjected to SPF testing in vivo using UV 2000 spectroanalyser. The critical wavelength was found to be 381.50 nm, a SPF of 55.68 and a PA rating of PA++++ at 25% use, thereby indicating that the UV filter blend has a broad spectrum of sun protection. This indicated that a cream formulation without the Pongamia glabra Seed Oil (Salinatural KJ) also provides a high SPF for efficient sun protection, and addition of the Pongamia glabra Seed Oil provides further anti-oxidant and emollient properties to the cream formulation.
(ii) A sunscreen cream formulation containing the UV filter blend of Example 1, but without the actives in Phase A of the filter blend, was prepared as per the ingredients mentioned in Table 6 above. The formulation was subjected to SPF testing in vivo using UV 2000 spectroanalyser. The critical wavelength was found to be 374.33 nm, a SPF of 69.01 and a PA rating of PA++++ at 25% use, thereby indicating that the UV filter blend has a broad spectrum of sun protection. This cream formulation, despite not containing any of the natural actives, i.e. capryloyl salicylic acid, oil of Pongamia glabra seed or tetrahydrocurcumin, provided a very high SPF and PA rating, establishing the fact that the blend is an excellent sun protectant, and can be used with additional agents to provide further benefits to the skin.

Example 7
A sunscreen stick formulation containing the UV filter blend of Example 1 was prepared as follows–
Table 7
Phase Ingredients Quantity (%)

A UV filter blend of Example 1 25
Sunflower oil 3
Liquid Paraffin 5
Isopropyl Myristate 2

B Dibutyl Ethyl hexanoyl Glutamide 2
Dibutyl Lauroyl Glutamide 3
Caprylic Capric Triglyceride 47

C C12-15 alkyl benzoate 5
Lilac (C14-22 Alkane) 3
Tocopherol Acetate 0.5
D Orange Oil, Lemongrass oil, Sesame oil (Salinatural OLG) 1

The components of Phase A above were weighed and taken in a main vessel, and heated up to 65oC to 70oC. The components of Phase B were weighed in another vessel, and heated until it all dissolved. The heated Phase B was added to Phase A and mixed well. The components of Phase C and D were premixed and then added to the above mixture. After mixing well the solution was poured into moulds and allowed to set. The final appearance of the stick thus obtained was Light Yellow in colour and it had a pH of 5.5. This sunscreen stick helps defend against UVA and UVB rays to prevent sunburn and radical damage, given that it includes the UV filter blend of Example 1 which has SPF greater than 50. The stick also helps to provide better overall coverage, with no oil feel and with water-resistant properties.
,CLAIMS:We claim:

1. An Ultraviolet (UV) filter blend comprising a combination of the components –diethylamino hydroxybenzoyl hexylbenzoate, diethylhexyl butamido triazone, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl methoxycinnamate, ethylhexyl triazone and ethylhexyl salicylate, wherein the individual components are present in amounts such that at 25% use, the UV filter blend has a Sun Protection Factor greater than 50 and a Protection grade of UV A rating of PA+++.
2. The UV filter blend of claim 1 further comprising homosalate.
3. The UV filter blend of claim 1 further comprising at least one of the components selected from a group consisting of capryloyl salicylic acid, oil of Pongamia glabra seed and tetrahydrocurcumin.
4. The UV filter blend of claim 3 further comprising homosalate.
5. The UV filter blend as claimed in claim 1, wherein,
(vii) Diethylamino hydroxybenzoyl hexylbenzoate is present in a concentration of about 1 % to about 10 % by weight relative to the total weight of the UV filter blend;
(viii) Diethylhexyl butamido triazone is present in a concentration of about 1 % to about 10 % by weight relative to the total weight of the UV filter blend;
(ix) Bis-ethylhexyloxyphenol methoxyphenyl triazine is present in a concentration of about 1 % to about 10 % by weight relative to the total weight of the UV filter blend;
(x) Ethylhexyl methoxycinnamate is present in a concentration of about 5 % to about 10 % by weight relative to the total weight of the UV filter blend;
(xi) Ethylhexyl triazone is present in a concentration of about 1 % to about 5 % by weight relative to the total weight of the UV filter blend;
(xii) Ethylhexyl salicylate is present in a concentration of about 1 % to about 10 % by weight relative to the total weight of the UV filter blend.
6. The UV filter blend of claim 5 further comprising Homosalate in a concentration of about 5 % to about 15 % by weight relative to the total weight of the UV filter blend.
7. The UV filter blend as claimed in claim 5, further comprising
(iv) Capryloyl salicylic acid in a concentration of about 1 % to about 2 % by weight relative to the total weight of the UV filter blend;
(v) Pongamia glabra seed oil in a concentration of about 1 % to about 2% by weight relative to the total weight of the UV filter blend; and
(vi) Tetrahydrocurcumin in a concentration of about 0.5 % to about 1 % by weight relative to the total weight of the UV filter blend.
8. The UV filter blend as claimed in claim 7 further comprising Homosalate in a concentration of about 5 % to about 15 % by weight relative to the total weight of the UV filter blend.
9. The UV filter blend as claimed in claim 1, wherein the filter blend is an oil-soluble light yellow liquid having a viscosity in the range of about 2000cps to about 2500cps.