Water-in-oil emulsion stability with volatile hydrocarbon oil
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Solution Overview
Problem
Water-in-oil-type emulsions with non-volatile silicone oils face stability issues when a volatile hydrocarbon oil component is incorporated, leading to usability problems such as an oily feeling and reduced emulsification stability over time.
Innovation Solution
Incorporating a combination of polyethylene glycol mono- or di-isostearate with a specific number of oxyethylene groups, polyoxyethylene-polydimethylsiloxyethyl dimethicone, and an organically-modified clay mineral into the emulsion to form a stable oil gel, ensuring emulsification stability and non-oily usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a volatile hydrocarbon oil component is incorporated into a water-in-oil-type emulsion comprising a non-volatile silicone oil, then surface-slip feeling and squeaky feeling are improved, but the stability of the emulsion over time is decreased
Solution Approach 1:
The patent introduces a specific emulsifier system comprising a polyoxyethylene-modified organopolysiloxane and a polyethylene glycol ester as intermediary substances that mediate between the volatile hydrocarbon oil and non-volatile silicone oil phases. This emulsifier combination creates a stable interfacial film that prevents phase separation while allowing the volatile hydrocarbon oil to provide improved surface-slip and squeaky feelings, thus resolving the contradiction between usability and stability.
Solution Approach 2:
The patent employs a composite emulsifier system combining two different types of emulsifying agents: a polyoxyethylene-modified organopolysiloxane and a polyethylene glycol ester. This composite approach leverages the complementary properties of both emulsifiers to simultaneously achieve emulsion stability and the desired sensory characteristics from volatile hydrocarbon oil, preventing the stability deterioration that would occur with either emulsifier alone.
2Ease of operation
If a volatile oil component is incorporated to improve the oily feeling of water-in-oil-type emulsions, then non-oily usability is improved, but emulsification stability is decreased
Solution Approach 1:
The patent uses a specifically designed emulsifier system as an intermediary that enables the incorporation of volatile oil components for non-oily usability without compromising emulsification stability. The polyoxyethylene-modified organopolysiloxane and polyethylene glycol ester work together to stabilize the emulsion interface, allowing volatile oils to be incorporated while preventing the emulsion from breaking.
3Reliability
If water-in-oil-type emulsions contain a large amount of oil component to achieve water resistance, then water resistance is improved, but oily feeling when applied to skin increases
Solution Approach 1:
The patent changes the physical and chemical parameters of the oil phase by incorporating volatile hydrocarbon oils with specific volatility characteristics. This parameter change allows the emulsion to maintain water resistance through the non-volatile silicone oil while the volatile components evaporate to reduce oily feeling, thus resolving the contradiction between water resistance and sensory comfort.
Solution Approach 2:
The patent creates a composite oil phase system combining non-volatile silicone oil (for water resistance) with volatile hydrocarbon oils (for reduced oily feeling). This composite approach allows both functionalities to coexist: the non-volatile portion provides water resistance while the volatile portion evaporates to minimize oily sensation on the skin.
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 solution provides a water-in-oil-type emulsion cosmetic with improved stability and non-oily usability, eliminating surface-slip and squeaky feelings while maintaining skin moisture, and maintaining emulsification stability over time.
Implementation Method 1
a water-in-oil-type emulsion skin cosmetic comprising a volatile hydrocarbon oil and a non-volatile silicone oil, which is excellent in emulsification stability
Implementation Method 2
it is necessary to form a stable oil gel in order to obtain a stable water-in-oil-type emulsion cosmetic
Implementation Method 3
a volatile hydrocarbon oil component is incorporated... surface-slip feeling and squeaky feeling are improved
Implementation Method 4
a polyethylene glycol mono- or di-isostearate comprising 4 to 12 oxyethylene groups
Data Source
AI summary
Disclosed is a skin cosmetic in which the emulsion stability can be ensured even when the skin cosmetic is prepared by adding a volatile hydrocarbon oil to a water-in-oil-type emulsion composition containing a non-volatile silicone oil, and which has an excellent non-oily sensation upon application. Specifically disclosed is a water-in-oil-type emulsion skin cosmetic which is characterized by comprising (A) 3 to 25% mass of a volatile hydrocarbon oil, (B) 0.1 to 15% by mass of a non-volatile silicone oil, (C) 0.1 to 1% by mass of a polyethylene glycol mono- or di-isostearate having 4 to 12 oxyethylene groups, (D) 0.1 to 5% by mass of a polyoxyethylene-polydimethylsiloxyethyl-dimethicone copolymer, and (E) an organically-modified clay mineral.