Stabilizing Sunscreen UV Filters with Diphenylacrylates
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Solution Overview
Problem
Current sunscreen formulations containing combinations of micronized triazine derivatives and UV absorbers like cinnamic acid derivatives and dibenzoyl methane derivatives suffer from rapid photodegradation, leading to reduced protection against sun damage.
Innovation Solution
Incorporating diphenylacrylates and hydroxyphenyl triazine derivatives into sunscreen compositions to enhance the stability of UV filter combinations, specifically using micronized forms of these compounds to improve their photostability and effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If micronized triazine derivatives and UV absorbers (cinnamic acid derivatives and dibenzoyl methane derivatives) are used in sunscreen formulations, then UV protection coverage is improved, but photostability deteriorates due to rapid photodegradation
Solution Approach 1:
The patent introduces diphenylacrylates and hydroxyphenyl triazine derivatives as intermediary substances that mediate between the unstable UV filter combination and UV radiation. These intermediaries absorb UV energy and transfer it safely, preventing direct degradation of the cinnamic acid derivatives and dibenzoyl methane derivatives, thus resolving the contradiction between providing UV protection and maintaining photostability.
Solution Approach 2:
The patent creates a composite UV filter system combining micronized triazine derivatives, diphenylacrylates, hydroxyphenyl triazine derivatives, cinnamic acid derivatives, and dibenzoyl methane derivatives. This composite formulation leverages the complementary properties of each component: the micronized triazines provide broad-spectrum absorption, the diphenylacrylates and hydroxyphenyl triazines enhance photostability, and the cinnamic acid derivatives and dibenzoyl methane derivatives provide additional UV protection, achieving both effectiveness and stability.
2Adaptability or versatility
If conventional UV filter combinations are used to provide broad UV coverage, then sun protection capability is improved, but duration of action deteriorates due to rapid photodegradation
Solution Approach 1:
The patent applies preliminary action by incorporating photostabilizers (diphenylacrylates and hydroxyphenyl triazine derivatives) into the formulation before exposure to UV radiation. These stabilizers pre-position themselves to protect the UV filters, creating a protective framework that extends the duration of action. The micronized form of the triazine derivatives is also prepared in advance to ensure optimal dispersion and stability upon application.
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 use of diphenylacrylates and hydroxyphenyl triazines stabilizes the UV filter combinations, providing prolonged protection against UV-A and UV-B radiation, thus enhancing the longevity of sunscreen efficacy.
Implementation Method 1
the use of UV absorbers selected from (a1) diphenylacrylates; and (a2) hydroxyphenyl triazines... for stabilizing cosmetic compositions comprising the combination of organic UV absorbers
Implementation Method 2
A new class of organic UV filters are micronized piperazine bi-bisaminobenzophenones... in micronized form
Data Source
AI summary
Disclosed is the Use of UV absorbers selected from (a1) diphenylacrylates; and (a2) specific hydroxyphenyl triazines for stabilizing cosmetic compositions comprising an organic UV absorber selected from (b1) a specific benzophenone derivative, (b2) a specific benzotriazole derivative and (b3) a specific triazine derivative and UV filters selected from (c1) cinnamic acid derivatives; and (c2) dibenzoylmethane derivatives.