Water-in-oil Emulsion Stabilization with Amino Acid Esters
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Solution Overview
Problem
Water-in-oil type emulsified cosmetics with high silicone oil content face challenges in emulsification stability and sticky feeling, as existing techniques struggle to incorporate high silicone oil effectively without using limited emulsifying agents and surfactants, leading to phase separation and stickiness issues.
Innovation Solution
Incorporating N-long chain acyl neutral amino acid esters, silicone oils, and water in specific ratios to stabilize emulsification and improve the feel of cosmetics, using N-long chain acyl neutral amino acid esters, silicone oils, and water in specific ratios to form stable water-in-oil emulsions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If silicone oil is incorporated at a high content to eliminate sticky feeling, then the sticky feeling is improved, but emulsification stability deteriorates causing phase separation
Solution Approach 1:
The invention changes the chemical structure parameters of the emulsifying agent by specifying N-long chain acyl neutral amino acid esters with particular molecular weight ranges (600-2000) and structural formulas. This parameter optimization enables stable emulsification even at high silicone oil contents (5-95 wt%), resolving the contradiction between eliminating stickiness and maintaining emulsification stability
Solution Approach 2:
The invention creates a composite emulsion system combining silicone oil with N-long chain acyl neutral amino acid esters and water in specific ratios. This composite formulation achieves both high silicone oil content for non-sticky feel and stable emulsification by leveraging the synergistic effects of the specific emulsifying agent with the silicone oil phase
2Stability of the object's composition
If conventional emulsifying agents are used to stabilize emulsification, then emulsification stability is improved, but the number of available agents is extremely limited
Solution Approach 1:
The invention identifies N-long chain acyl neutral amino acid esters as a universal emulsifying agent class that can stabilize water-in-oil emulsions across a wide range of formulations. The specified structural formula and molecular weight range create a versatile emulsifying platform that works with various silicone oils and cosmetic ingredients, greatly expanding the available options beyond conventional limited agents
3Stability of the object's composition
If N-long chain acyl neutral amino acid esters are used as emulsifying agents, then emulsification stability is improved, but it was previously unknown that they have emulsifying ability
Solution Approach 1:
The invention enables N-long chain acyl neutral amino acid esters to serve dual functions: as the oil phase component (providing moisturizing and cosmetic benefits) and as the emulsifying agent (stabilizing the water-in-oil emulsion). This self-service capability eliminates the need for separate emulsifying agents and provides predictable emulsification based on the inherent molecular structure of these compounds
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 water-in-oil type emulsified compositions with enhanced emulsification stability and reduced stickiness, suitable for use in cosmetics like sunscreen creams and moisturizing products.
Implementation Method 1
a water-in-oil type emulsified composition, which comprises: (A) at least one N-long chain acyl neutral amino acid ester... (B) at least one silicone oil... and (C) water
Implementation Method 2
N-long chain acyl neutral amino acid esters... to stabilize emulsification
Data Source
AI summary
Water-in-oil type emulsified compositions with a high silicone oil content which are excellent in emulsification stability and whose sticky feeling has been improved may be obtained by incorporating a specific (A) N-long chain acyl neutral amino acid ester, (B) a silicone oil, and (C) water therein.