Interference Pigment Skin Care Composition Reduces Redness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional skin care compositions using colored pigments to reduce redness often result in an unnatural appearance due to high pigment concentrations and limited color selection, leading to an 'mask-like' effect or unnatural green tones, while compositions with interference pigments are restricted in pigment choice and require specific ratios for chroma minimization.
Innovation Solution
A skin care composition incorporating a dermatologically acceptable carrier with a combination of interference pigments, where the first pigment has a hue angle between 180°-224° and the second between 80°-95°, with a total pigment weight of less than 4% of the composition, allowing for effective redness reduction with minimal impact on healthy skin appearance across a wide range of pigment ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional colored pigments are used to reduce redness, then redness reduction effect is achieved, but unnatural green color is imparted to healthy skin
Solution Approach 1:
The patent changes the fundamental parameter of pigment type from conventional colored pigments (green pigments) to interference pigments that physically interfere with light. This parameter change allows redness reduction through optical interference rather than color cancellation, preventing the green tint problem while maintaining efficacy
Solution Approach 2:
The patent replaces the chemical/color-based mechanism (using green pigments to cancel red) with a physical/optical mechanism (interference pigments that reflect or absorb specific wavelengths through physical interference). This substitution eliminates the need for complementary colors and their associated side effects
2Reliability
If high pigment concentrations are used to conceal skin discontinuities, then coverage effect is improved, but mask-like appearance is created
Solution Approach 1:
The patent changes the pigment concentration parameter from high (conventional foundations requiring 10-30% pigment) to low (interference pigment compositions achieving coverage at 1-5% pigment). The unique optical properties of interference pigments provide enhanced coverage at lower concentrations, eliminating the mask-like effect
Solution Approach 2:
The patent uses composite interference pigment structures (multi-layered particles with different refractive indices) that create optical interference effects. This composite structure provides superior coverage and redness reduction at lower concentrations compared to conventional single-phase pigments
3Object-affected harmful factors
If interference pigments are used instead of conventional pigments, then natural skin appearance is maintained, but selection of pigments is limited
Solution Approach 1:
The patent changes the approach from selecting pigments based on color (hue) to selecting interference pigments based on optical properties (refractive index, particle size, layer structure). This parameter change expands versatility because interference pigments can be tuned to produce various optical effects without being constrained by conventional color theory limitations
4Object-affected harmful factors
If first and second pigments are used in 1:1 ratio to minimize chroma, then color neutrality is achieved, but flexibility in pigment ratios is lost
Solution Approach 1:
The patent changes the constraint from fixed 1:1 ratio to a range of acceptable ratios (e.g., 1:4 to 4:1). This is enabled by the unique optical properties of interference pigments that maintain effectiveness across varying proportions, providing both chroma minimization and formulation flexibility simultaneously
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 effectively reduces red appearance of skin discontinuities with minimal impact on surrounding skin, achieving a Redness Reduction Index of less than -7.5 and a Healthy Skin Color Change Value of less than 3, while maintaining a low chroma and flexibility in pigment ratios.
Implementation Method 1
The layers of the interference pigment have different refractive indices, and reflect a color resulting from the constructive or destructive interference of reflections of light from the different layers
Data Source
AI summary
A pigmented skin care composition including a dermatologically acceptable carrier and at least a first and second interference pigment. The composition according to the invention is useful in improving the appearance of the skin and in particular in reducing the appearance of skin discontinuities.