Emulsion Sunscreen Composition for Broad-Spectrum UV and Blue Light Blocking

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Solution Overview

Problem

Existing cosmetic compositions fail to provide comprehensive protection against a wide range of harmful electromagnetic radiation, including UV radiation and blue light, due to the limited solubility of UV blockers and the reliance on oil-soluble thickeners, leading to uneven blocking effects and reduced stability.

Innovation Solution

A cosmetic composition in emulsion form containing an aqueous phase and an oil phase, stabilized by at least three UV blockers, an emulsifier, and a thickener, with specific UV blockers in each phase, ensuring uniform and long-lasting protection against UV radiation and blue light.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If only inorganic UV blockers or oil-soluble UV blockers are used in water-in-oil emulsion, then formulation stability is improved, but the blocking effect against a wide range of harmful radiation is insufficient

Engineering Contradiction:

Improveformulation stabilityVSAvoidblocking effect against harmful radiation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent divides UV blockers into two groups: water-soluble UV blockers (first group) and oil-soluble UV blockers (second group). Each group is placed in its respective phase (aqueous phase and oil phase), allowing the formulation to maintain stability while achieving comprehensive radiation blocking through the combined effect of both groups.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the emulsion (aqueous phase and oil phase) are assigned different UV blockers with different solubility characteristics. The aqueous phase contains water-soluble UV blockers while the oil phase contains oil-soluble UV blockers, optimizing the blocking effect in each phase according to its local properties.

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If oil-soluble thickeners are used in the oil phase, then formulation viscosity is improved, but the distribution of UV blockers becomes uneven

Engineering Contradiction:

Improveformulation viscosityVSAvoiduniformity of UV blocker distribution

Core Design Contradiction:

Stability of the object's compositionVSManufacturing precision

Solution Approach 1:

The patent uses two separate thickeners: a water-soluble thickener in the aqueous phase and an oil-soluble thickener in the oil phase. This segmentation ensures that each phase achieves appropriate viscosity without interfering with the uniform distribution of UV blockers in the other phase, maintaining both formulation stability and uniform UV blocker distribution.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each phase is thickened by a thickener matched to its solubility characteristics (water-soluble thickener for aqueous phase, oil-soluble thickener for oil phase), allowing optimal viscosity control in each local region without compromising the overall uniformity of UV blocker distribution.

Inventive Principle:

Principle #3Local quality

3Device complexity

If a single UV blocker type is used, then formulation simplicity is improved, but the blocking effect against wide range of wavelengths is insufficient

Engineering Contradiction:

Improveformulation complexityVSAvoidblocking effect against wide range of wavelengths

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent segments UV protection into two functional groups: water-soluble UV blockers for the aqueous phase and oil-soluble UV blockers for the oil phase. This segmentation enables coverage of a broader wavelength range while maintaining relatively simple formulation and application characteristics.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates a composite emulsion system combining water-soluble and oil-soluble UV blockers with their respective thickeners. This composite approach achieves comprehensive radiation blocking across wide wavelengths while maintaining formulation simplicity through the emulsion structure.

Inventive Principle:

Principle #40Composite materials

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 exhibits excellent blocking effects across a wide range of wavelengths, including UV-A, UV-B, UV-C, and blue light, with improved stability and long-term water resistance.

Implementation Method 1

the at least three UV blockers have an excellent effect of blocking harmful radiation including UV radiation

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Data Source

PatentEP4721723A1Cosmetic composition having excellent efficacy in blocking harmful rays including ultraviolet rays

Publication Date: 2026.04.08 KOLMAR KOREA

Figure 1a~1b

AI summary

A cosmetic composition of the present invention, which has an excellent effect of blocking harmful radiation including ultraviolet radiation, contains at least three UV blockers, an emulsifier and a thickener, thereby stabilizing the at least three UV blockers in the formulation and exhibiting an excellent blocking effect against harmful radiation including ultraviolet radiation. In addition, the cosmetic composition has excellent long-lasting water resistance, and thus can continuously exhibit an excellent harmful radiation blocking effect even when a user sweats or is active in water.