Oil-in-Water Emulsion for Sensitive Skin Moisturization
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Solution Overview
Problem
Existing cosmetics struggle to provide sustained moisturizing effects on dry sensitive skin, often leading to repetitive dryness and roughness, and may cause stickiness or sliminess, which can be uncomfortable and require frequent washing.
Innovation Solution
An oil-in-water-type emulsion composition comprising hydrocarbon oil, higher fatty acid or higher alcohol, cationic or amphoteric surfactant, ceramide, and water, with specific ratios and concentrations of these components to enhance absorption, spreadability, and skin glow without stickiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cosmetics with high moisturizing effect are applied to dry sensitive skin, then the moisturizing effect is improved, but stickiness or sliminess occurs which causes discomfort
Solution Approach 1:
The patent changes the physical and chemical parameters of the cosmetic composition by specifying precise ratios of oil components (A and B), surfactants (C), and ceramides (D). By controlling the mass ratio of component B to the total oil content and the specific types of oils used, the formulation achieves high moisturizing effect while minimizing stickiness and sliminess, resolving the contradiction between effective moisturization and comfort.
2Loss of time
If cosmetics are applied to wet skin, then application time is reduced, but the cosmetic runs down and cannot provide sufficient moisturizing effect
Solution Approach 1:
The patent introduces specific surfactants (component C) and ceramides (component D) as intermediary substances that act as anchors between the oil-based moisturizing agents and the skin surface. These intermediaries prevent the cosmetic from running down by creating adhesion to the skin, while still allowing rapid application to wet skin without compromising the moisturizing effect.
3Reliability
If cosmetics are applied to dry skin, then sufficient moisturizing effect is achieved, but the time required for toweling and spreading increases while skin starts to dry
Solution Approach 1:
The patent formulates the cosmetic with pre-balanced oil components, surfactants, and ceramides in specific ratios before application. This preliminary formulation ensures that when applied to wet skin, the product automatically provides sufficient moisturizing effect without requiring extensive toweling or spreading time, as the composition is already optimized for rapid absorption and skin bonding.
4Ease of operation
If liquid oils are used in the composition, then spreadability and absorption feeling are improved, but the composition may feel slimy
Solution Approach 1:
The patent creates a composite oil system combining multiple oil components (A and B) with specific surfactants and ceramides. This composite formulation leverages the beneficial properties of liquid oils for spreadability and absorption while the surfactant and ceramide components counteract sliminess, achieving a balanced sensory profile that is both easy to apply and comfortable to wear.
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 provides an excellent absorption feeling, maintains a moist feeling after washing, spreads easily on wet skin without sliminess, offers a protective cover feeling, and enhances skin glow without stickiness, even after washing off with water.
Implementation Method 1
from 0.1 to 5% by mass of one or more members selected from the group consisting of a cationic surfactant and an amphoteric surfactant
Implementation Method 2
a hydrocarbon oil which is in a liquid state at 25°C, one or more members selected from the group consisting of a higher fatty acid, a higher alcohol, and an ester oil
Implementation Method 3
from 2 to 20% by mass of one or more members selected from the group consisting of a ceramide, a hydrocarbon oil which is in a paste state at 25°C, and an ester oil which is in a paste state at 25°C
Data Source
Figure 1
AI summary
Provided is an oil-in-water-type emulsion composition comprising the following components (A), (B), (C), (D), and (E): (A) a hydrocarbon oil which is in a liquid state at 25°C, (B) one or more members selected from the group consisting of a higher fatty acid, a higher alcohol, and an ester oil which are in a liquid state at 25°C, (C) from 0.1 to 5% by mass of one or more members selected from the group consisting of a cationic surfactant and an amphoteric surfactant, (D) from 2 to 20% by mass of one or more members selected from the group consisting of a ceramide, a hydrocarbon oil which is in a paste state at 25°C, and an ester oil which is in a paste state at 25°C, and (E) water, wherein a total content of the components (A) and (B), (A) + (B), is from 1 to 30% by mass, and a mass ratio of the component (B) to the total amount of the components (A) and (B), (B) / ((A) + (B)), is from 0.05 to 0.9.