Elliptical Polymer UV Scattering Agent for Cosmetics
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Solution Overview
Problem
Current UV shielding agents, such as UV absorbers and scattering agents, face issues like limited wavelength protection, durability concerns, and adverse skin effects, while inorganic particles like zinc oxide or titanium oxide cause agglomeration and loss of glossiness, and are not lightweight, making them unsuitable for cosmetics and films.
Innovation Solution
Development of elliptical or needle-like polymer particles with specific dimensions and aspect ratios, combined with spherical or substantially spherical particles, to create a UV scattering agent that provides excellent light-scattering properties, safety, and flowability, suitable for use in cosmetics, paints, and films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If inorganic particles (zinc oxide, titanium oxide) are used as UV scattering agents, then UV scattering effect is improved, but hiding power becomes too high and glossiness is lost
Solution Approach 1:
The patent changes the particle size parameters of inorganic UV scattering agents to specific ranges (zinc oxide: 0.5-5 μm, titanium oxide: 0.3-3 μm) to optimize the balance between UV scattering effect and glossiness, preventing excessive hiding power while maintaining protection
Solution Approach 2:
The patent creates a composite UV scattering system by combining multiple inorganic particles (zinc oxide and titanium oxide) with different refractive indices and particle size distributions, achieving synergistic UV scattering while controlling hiding power and maintaining glossiness
2Object-affected harmful factors
If inorganic particles are used as UV scattering agents, then UV scattering effect is improved, but dispersion stability deteriorates due to agglomeration
Solution Approach 1:
The patent introduces surfactants as intermediary substances to mediate between inorganic UV scattering particles and the continuous phase, preventing agglomeration and maintaining stable dispersion while preserving UV scattering effectiveness
Solution Approach 2:
The patent optimizes particle size parameters (0.5-5 μm for zinc oxide, 0.3-3 μm for titanium oxide) to reduce Brownian motion and van der Waals forces that cause agglomeration, improving dispersion stability while maintaining UV scattering effect
3Object-affected harmful factors
If UV absorbers are used to shield UV radiation, then UV shielding effect is improved, but wavelength coverage is limited and skin safety deteriorates
Solution Approach 1:
The patent creates a composite UV protection system combining UV absorbers (organic compounds) with UV scattering agents (inorganic particles), where each component targets different UV wavelengths through different mechanisms, achieving broad-spectrum coverage and improved skin safety
Solution Approach 2:
The patent segments the UV protection function into two independent mechanisms: UV absorbers for specific wavelength absorption and inorganic scattering agents for broader wavelength scattering, with each segment addressing different portions of the UV spectrum
4Object-affected harmful factors
If inorganic particles are used as UV scattering agents, then UV scattering effect is improved, but product weight increases
Solution Approach 1:
The patent reduces particle size parameters (0.5-5 μm for zinc oxide, 0.3-3 μm for titanium oxide) to decrease the density and weight contribution of inorganic UV scattering agents while maintaining effective UV scattering through increased surface area and optimized light interaction
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 UV scattering agent is lightweight, offers superior light-scattering and tactile qualities, and ensures excellent safety, effectively shielding UV radiation without causing skin irritation, while maintaining stability and optical characteristics.
Implementation Method 1
UV scattering agent characterized by comprising at least one type of elliptical or needle-like polymer particle
Data Source
Figure 1
AI summary
Provided is an ultraviolet scattering agent characterized by comprising at least one type of elliptical or needle-like polymer particle A, wherein (1) the average (LAV) of the long axis (L) in a two-dimensional projection diagram obtained by radiating light from a direction perpendicular to the long-axis direction is 0.1 to 80 µm, (2) the average (DAV) of the short axis (D) in a two-dimensional projection diagram obtained by radiating light from a direction perpendicular to the long-axis direction is 0.05 to 40 µm, and (3) the average (PAV) of the aspect ratio (L/D) calculated from the long axis (L) and the short axis (D) is 2 to 30.