Voided Latex Core-Shell Particles for Sunscreen Odor and SPF
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Solution Overview
Problem
Existing personal care compositions containing UV radiation-absorbing agents and voided latex particles face challenges in achieving a balance between enhanced SPF and undesirable odor profiles, making them unsuitable for use in products like face creams and sunscreens.
Innovation Solution
The development of personal care compositions incorporating voided latex particles with specific core and shell polymers, comprising monoethylenically unsaturated monomers and aliphatic monomers, which provide a boosting effect on SPF while improving the odor profile by incorporating UV absorbing agents in controlled amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voided latex particles are incorporated into sunscreen compositions to boost SPF, then UV protection is improved, but odor profile deteriorates becoming unpleasant
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the core contains voided latex particles for UV scattering and the shell contains UV absorbing agents. This spatial differentiation allows each region to perform its specialized function - the core provides SPF boosting through light scattering while the shell provides UV absorption with controlled odor, resolving the contradiction between UV protection and odor profile.
Solution Approach 2:
The patent uses composite materials by combining voided latex particles with UV absorbing agents in a core-shell architecture. The composite structure integrates two different material systems - the voided latex core for physical UV scattering and the UV absorbing agent shell for chemical UV absorption - to achieve both enhanced SPF and improved odor characteristics simultaneously.
2Reliability
If UV absorbing agents are increased to improve SPF, then UV protection is improved, but toxicological effects worsen
Solution Approach 1:
The patent applies parameter changes by optimizing the concentration and distribution of UV absorbing agents within the shell polymer. By controlling the amount and placement of UV absorbing agents in the shell rather than uniformly distributing them throughout the composition, the patent achieves effective SPF enhancement while minimizing toxicological exposure through controlled parameter optimization.
Solution Approach 2:
The patent uses the shell polymer as an intermediary that encapsulates UV absorbing agents. This intermediary structure allows UV absorbing agents to function effectively for SPF enhancement while the shell matrix controls their release and distribution, reducing direct exposure and toxicological effects on the user.
3Reliability
If voided latex particles are used to boost SPF, then UV absorption is improved, but composition complexity increases
Solution Approach 1:
The patent applies merging by combining multiple functions into a single core-shell particle structure. The voided latex core and UV absorbing agent shell are merged into one integrated particle that simultaneously provides UV scattering, UV absorption, and odor control functions, simplifying the overall composition architecture compared to using separate components for each function.
Solution Approach 2:
The patent achieves universality by designing the core-shell particle to perform multiple functions: the voided latex core provides UV scattering and SPF boosting, while the shell provides UV absorption and odor control. This multi-functional particle design eliminates the need for separate additives for each function, reducing composition complexity while maintaining comprehensive UV protection.
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 compositions effectively enhance SPF while maintaining a pleasing odor profile, making them suitable for use in various personal care products, including sunscreens, by utilizing voided latex particles with a core and shell polymer structure that balances UV absorption and fragrance.
Implementation Method 1
personal care compositions comprising light scatterers and UV radiation-absorbing agents have been disclosed
Implementation Method 2
UV absorbing agents include physical blockers, such as titanium dioxide, and chemical absorbers, such as para-aminobenzoic acid and octyl methoxycinnamate
Data Source
AI summary
Provided are personal care compositions comprising a core polymer and at least one shell polymer provide SPF boosting and an improved odor profile, wherein the core polymer comprises polymerized units derived from monoethylenically unsaturated monomers containing at least one carboxylic acid group and non-ionic ethylenically unsaturated monomers, and the shell polymer comprises polymerized units derived from non-ionic ethylenically unsaturated monomers and aliphatic monomers selected from the group consisting of tri(meth)acrylates and (meth)acrylic monomers having mixed ethylenic functionality.