Non-nano UV Filter Dispersion via Temperature Control
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Solution Overview
Problem
Existing methods for producing micronized organic UV filters often result in nano-sized dispersions, which are undesirable due to public concerns and efficiency issues, and there is a need for a process that produces non-nano UV absorber suspensions that provide sufficient UV protection without using nano materials.
Innovation Solution
A process involving the milling of organic UV filters in a mixture of water and a hydrophobic additive at adjusted temperatures to prevent the formation of nano materials, achieving particle sizes that are non-nano while maintaining UV protection efficiency, using a temperature range of 35 to 90°C and specific hydrophobic additives like cosmetic oils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional grinding methods are used to produce micronized UV filter dispersions, then UV protection efficiency is improved, but nano materials are formed which are undesirable due to public concerns and efficiency issues
Solution Approach 1:
The patent applies parameter changes by controlling the pH value of the aqueous phase within 2-8 and temperature between 20-80°C during the grinding process. These parameter adjustments prevent unwanted nano-material formation while maintaining effective UV protection, resolving the contradiction between efficiency and particle size control
Solution Approach 2:
The patent uses an intermediary approach by employing specific dispersants and surfactants during the grinding process. These intermediaries control particle size distribution and prevent aggregation, enabling production of non-nano sized particles that maintain UV protection efficiency without forming undesirable nano materials
2Reliability
If particle size is reduced to enhance UV protection efficiency, then UV absorption performance is improved, but nano materials are produced which raise public concerns
Solution Approach 1:
The patent changes physical parameters including maintaining pH between 2-8 and temperature between 20-80°C during processing. These parameter modifications enable production of UV filter particles in the 0.1-10 μm range that provide sufficient UV protection without forming nano materials, thus eliminating the harmful effect of nano-material production
Solution Approach 2:
Instead of reducing particle size to improve UV efficiency (which creates nano materials), the patent inverts the approach by maintaining larger particle sizes (0.1-10 μm) and achieving UV protection efficiency through optimized dispersion and formulation, thereby avoiding nano material formation entirely
3Reliability
If grinding intensity is increased to achieve finer particle size, then UV protection efficiency is improved, but the process complexity and energy consumption increase
Solution Approach 1:
The patent applies preliminary action by pre-dispersing the UV filters in the aqueous phase before the main grinding process. This preliminary dispersion step, combined with pH and temperature control, reduces the intensity needed during subsequent grinding, simplifying the overall process while maintaining UV protection efficiency
Solution Approach 2:
The patent uses dispersants and surfactants as intermediaries that facilitate particle separation and size control during grinding. These intermediaries reduce the mechanical intensity required for effective grinding, thereby simplifying the grinding process and reducing energy consumption while achieving the desired UV protection efficiency
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 process effectively produces non-nano UV filter suspensions with particle sizes above 100 nm, ensuring sufficient UV protection efficiency and avoiding the use of nano materials, thus addressing public concerns and performance issues.
Implementation Method 1
milling a suspension (2) comprising the at least one organic UV filter in a mixture of water and a hydrophobic additive in a milling apparatus
Implementation Method 2
at an elevated temperature in the milling apparatus, in particular at a temperature of 35 to 90° C.
Implementation Method 3
milling a suspension (2) comprising the at least one organic UV filter in a mixture of water and a hydrophobic additive
Data Source
AI summary
The present invention relates to a process of manufacturing an aqueous suspension (1) of at least one micronized organic UV filter as well as to an aqueous suspension (1) comprising at least one micronized organic UV filter.