Skin Cleansing Composition with Ether Oil and Acrylic Polymer
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Solution Overview
Problem
Conventional skin cleansing agents and sheets have insufficient cleansing power and leave an oily feeling on the skin, particularly when removing waterproof mascara, and they also lack stability and a pleasant skin feel during and after use.
Innovation Solution
A skin cleansing composition comprising ether oil, a water-soluble polymer derived from acrylic or methacrylic acid, and a hydrocarbon oil, combined with a nonionic surfactant, and a skin cleansing sheet with a layered nonwoven structure impregnated with an O/W emulsion, which provides a high cleansing power, fresh feel, and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cleansing agents use oil agents and nonionic surfactants to remove waterproof mascara, then cleansing power is improved, but an oily feeling remains on the skin
Solution Approach 1:
The invention changes the chemical composition parameters by introducing a specific water-soluble polymer (acrylic acid or methacrylic acid-based) combined with ether oil and hydrocarbon oil in controlled ratios. This parameter change modifies the surfactant system to achieve thorough removal of waterproof mascara while preventing oily residue on the skin, directly resolving the contradiction between cleansing power and oily feeling.
Solution Approach 2:
The invention uses a composite cleansing system combining multiple components: ether oil, hydrocarbon oil, water-soluble polymer, and nonionic surfactant in specific proportions. This composite material approach creates a synergistic effect that enhances cleansing power for waterproof mascara while the water-soluble polymer component specifically addresses the oily feeling problem, allowing both requirements to be satisfied simultaneously.
2Ease of operation
If cleansing sheets use nonwoven materials impregnated with cleansing agents, then ease of operation is improved, but stability and pleasant skin feel are insufficient
Solution Approach 1:
The invention modifies the physical parameters of the nonwoven structure by specifying a layered configuration with controlled density ratios (first layer density/second layer density ≥ 1.05) and thickness ratios (0.6-1.5). These parameter changes enhance the sheet's stability and ability to maintain cleansing agent distribution, while the impregnation with the specialized O/W emulsion composition ensures pleasant skin feel, resolving both stability and ease of use requirements.
Solution Approach 2:
The invention applies local quality differentiation through the layered nonwoven structure where the first layer and second layers have different densities and functions. The first layer provides structural stability and controlled release, while the second layers provide contact quality and skin feel. This local differentiation allows the sheet to simultaneously achieve stability and pleasant skin feel during use.
3Reliability
If conventional cleansing agents combine various oil agents and surfactants to remove makeup, then cleansing power is improved, but the composition becomes complex and stability decreases
Solution Approach 1:
The invention simplifies the composition by establishing specific parameter ranges and ratios for each component: ether oil (0.1-25 mass%), hydrocarbon oil (1-30 mass%), water-soluble polymer (0.003-1 mass%), and nonionic surfactant (0.49 mass% or less). By controlling these parameters and their ratios ((B)/(A) from 0.0001 to 0.1, (A)/((A)+(C)) from 0.05 to 0.9), the formulation achieves high cleansing power for waterproof mascara while maintaining composition simplicity and stability.
Solution Approach 2:
The invention promotes homogeneity in the O/W emulsion formulation by carefully balancing the hydrophilic and lipophilic components. The water-soluble polymer and nonionic surfactant work together to create a homogeneous emulsion structure that ensures stable mixing of oil and water phases, preventing separation while maintaining effective cleansing action. This homogeneity reduces composition complexity and enhances stability.
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 removes waterproof mascara, providing a soft, bouncy, and moist skin feel without an oily residue, while the sheet ensures thorough cleansing and stability, maintaining its quality over time.
Implementation Method 1
0.49 mass % or less of a nonionic surfactant having an HLB of larger than 9
Implementation Method 2
an O/W emulsion having a viscosity of from 200 to 15,000 mPa·s at 30° C.
Data Source
AI summary
Provided is a skin cleansing composition comprising the following components (A), (B), (C), (D), and (E): (A) 0.1 to 25 mass % of an ether oil which is in a liquid state at 25° C., (B) 0.003 to 1 mass % of a water-soluble polymer comprising acrylic acid or methacrylic acid as a constitutional unit, (C) 1 to 30 mass % of a hydrocarbon oil having a viscosity of 15 mPa·s or lower at 30° C., (D) 60 to 95 mass % of water, and (E) 0.49 mass % or less of a nonionic surfactant having an HLB of larger than 9, wherein the mass ratio of the component (B) to the component (A), (B)/(A) is from 0.0001 to 0.1, and the mass ratio between the component (A) and the component (C), (A)/((A)+(C)) is from 0.05 to 0.9.