Synergistic UV Filter Compositions for High SPF with Low Concentration
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Solution Overview
Problem
Current sunscreen compositions require high amounts of UV filters to achieve effective Sun Protection Factors (SPFs), which is not desirable for optimal protection and skin health.
Innovation Solution
A synergistic combination of UV filters, including octocrylene, avobenzone, Tinosorb S, Uvinul T150, Mexoryl SX, and Mexoryl XL, in specific ratios, is used to create a sunscreen composition that achieves high SPF with lower overall UV filter amounts, eliminating the need for boosters like sorbeth-2-hexaoleate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high amounts of UV filters are used in sunscreen compositions, then the Sun Protection Factor (SPF) increases, but the quantity of substance increases and may cause adverse effects on skin health
Solution Approach 1:
The patent combines six different UV filters (octocrylene, avobenzone, Tinosorb S, Uvinul T150, Mexoryl SX, and Mexoryl XL) in specific ratios to create a synergistic mixture. This combination allows achieving high SPF values with lower total amounts of UV filters compared to using single filters or conventional combinations, directly resolving the contradiction between SPF effectiveness and UV filter quantity
Solution Approach 2:
The invention creates a composite UV filter system by formulating a specific mixture of six different UV filtering agents. This composite approach leverages the complementary properties of each filter type (chemical and physical filters) to achieve superior UV protection with reduced overall filter concentration, addressing both the need for high SPF and reduced substance quantity
2Reliability
If high amounts of UV filters are used to achieve effective SPF, then UV protection improves, but the composition complexity and potential skin adverse effects increase
Solution Approach 1:
The patent optimizes the concentration parameters of each UV filter component within specific ranges (e.g., octocrylene 2-7 wt.%, avobenzone 2-5 wt.%, Tinosorb S 0.1-2 wt.%, etc.). By carefully controlling these parameters and their ratios, the formulation achieves high SPF protection while minimizing the total UV filter load on skin, thereby reducing potential adverse effects while maintaining protection efficacy
Solution Approach 2:
The invention replaces the need for additional booster agents (such as sorbeth-2-hexaoleate) by using a self-sufficient combination of six UV filters that achieve high SPF on their own. This eliminates or reduces the need for extra chemical boosters that could potentially increase skin exposure to harmful substances, thus reducing adverse effects while maintaining protection levels
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition provides excellent UV protection with significantly lower amounts of UV filters, achieving SPFs up to 174.73, which is 9.9 times higher than the total weight percent of the filters used, while maintaining stability and compatibility with keratinous substrates.
Implementation Method 1
The negative effects of exposure to ultraviolet ("UV") light are well-known... When skin is exposed to UV light having a wavelength of from about 290 nm to about 400 nm... Sunscreens can be used to protect against UV damage... The degree of UV protection afforded by a sunscreen composition is directly related to the amount and type of UV filters contained therein
Data Source
AI summary
Sunscreen compositions having a synergistic combination of ultraviolet light (UV) filtering agents that provide a high sun protection factor (SPF). Compositions according to the disclosure have high SPF values without requiring high overall amounts of UV filtering agents. Furthermore, the disclosure relates to methods of using the described compositions for protecting keratinous substances such as skin and hair from UV radiation. The ratio of each filter relative to avobenzone in the sunscreen compositions is typically as follows: octocrylene to avobenzone is 0.8:1.0 to 1.5:1.0; Tinosorb S to avobenzone 0.3:1.0 to 0.8:1.0; Uvinul T150 to avobenzone is 0.3: 1.0 to 1.0:1.0; Mexoryl SX to avobenzone is 0.1 :1.0 to 0.5:1.0; and Mexoryl XL to avobenzone is 0.3:1.0 to 1.0:1.0. The ratios relative to avobenzone are about: 1.2 : 1.0 : 0.5 : 0.6 : 0.4: 0.6 (octocrylene : avobenzone : Tinosorb S: Uvinul T150 : Mexoryl SX: Mexoryl XL).