Polyglycerol Esters Oligomer Distribution for Stable Emulsions
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Solution Overview
Problem
Existing polyglycerol esters in cosmetics fail to produce stable emulsions with good skin feel and microbiological stability, especially at low viscosity, and often require undesirable petrochemical-derived components like PEG.
Innovation Solution
Development of polyglycerol esters with a specific oligomer distribution, characterized by a mass ratio of glycerol to diglycerol greater than 1.5, which are produced through esterification of polyglycerol with specific carboxylic acids, allowing for the creation of stable, PEG-free emulsions suitable for various cosmetic formulations, including antiperspirants and deodorants, with enhanced preservative effectiveness and skin compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If polyglycerol esters are used as PEG-free emulsifiers in cosmetics, then renewable raw materials are utilized, but stable emulsions with good skin feel and microbiological stability cannot be produced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the oligomer distribution parameters of polyglycerol, specifically maintaining a mass ratio of glycerol to diglycerol greater than 1.5 and limiting polyglycerol with degree of polymerization ≥4 to less than 70% by mass. This parameter optimization enables the emulsifier to achieve both renewable material requirements and stable emulsion formation with good skin feel
Solution Approach 2:
The patent uses composite materials by combining polyglycerol with specific fatty acids (carboxylic acids with 8-24 carbon atoms) in controlled ratios. The esterification reaction creates a composite emulsifier structure that integrates the hydrophilic polyglycerol portion with the hydrophobic fatty acid chains, achieving both environmental sustainability and functional performance
2Ease of operation
If polyglycerol esters are designed with low viscosity for good skin feel, then application comfort is improved, but emulsion stability deteriorates
Solution Approach 1:
The patent resolves this contradiction through parameter changes in the oligomer distribution, specifically controlling the mass ratio of glycerol to diglycerol to be greater than 1.5 and limiting higher polymerization degree components. This optimized parameter set achieves the unique result of low viscosity maintaining good skin feel while simultaneously ensuring emulsion stability
3Object-generated harmful factors
If polyglycerol esters are formulated without preservatives for natural cosmetics certification, then naturalness is improved, but microbiological stability deteriorates
Solution Approach 1:
The patent applies self-service by designing the polyglycerol ester emulsifier with inherent microbiological stability properties through its specific oligomer distribution. The controlled structure with glycerol/diglycerol mass ratio >1.5 creates an emulsion system that resists microbial contamination without requiring additional preservative agents, enabling natural cosmetics certification
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 polyglycerol esters provide excellent storage stability, microbiological stability, and skin feel in cosmetic emulsions, enabling the formulation of PEG-free, aluminum salt-free antiperspirant and deodorant products with improved compatibility with UV filters and preservatives, while meeting the criteria for natural cosmetics certification.
Implementation Method 1
esterification of polyglycerol with specific carboxylic acids
Implementation Method 2
polyglycerol esters...use in, in particular, cosmetic formulations...as an emulsifier
Data Source
AI summary
The invention relates to new polyglycerol esters having a particular oligomer distribution in the polyglycerol, and to the use thereof in especially cosmetic formulations as an emulsifier, for example.