Polyglycerol Derivatives for Tunable Hydrophilicity
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Solution Overview
Problem
Polyglycerols have not been able to displace more expensive and complex polyalkylene glycol-based surfactants due to their high hydrophilicity, which makes it difficult to achieve lower hydrophilicity levels necessary for effective surface-active compounds, and they often lack derivatives with HLB values below 12.
Innovation Solution
Derivatization of polyglycerols through methylation and subsequent esterification with monocarboxylic acids, optionally followed by sulfation or esterification with maleic anhydride, to adjust hydrophilicity and achieve surface-active compounds with desired properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polyglycerols are used as surfactants, then they are inexpensive and easy to produce, but they have high hydrophilicity that prevents achieving lower HLB values below 12
Solution Approach 1:
The patent applies parameter changes by modifying the hydrophilicity of polyglycerols through controlled etherification with alkylene oxides. By adjusting the degree of etherification and the type of alkylene oxide used (ethylene oxide, propylene oxide, or mixtures), the HLB value can be precisely tuned to achieve values below 12, thereby expanding the adaptability of polyglycerol-based surfactants while maintaining their cost-effective production
Solution Approach 2:
The patent creates composite structures by combining polyglycerol backbones with alkylene oxide chains to form polyglycerol ether esters. This composite approach integrates the cost advantages and biodegradability of polyglycerols with the tunable surfactant properties of alkylene oxide chains, enabling both ease of manufacture and versatile hydrophilicity adjustment
2Adaptability or versatility
If polyglycerols are derivatized to reduce hydrophilicity, then HLB values below 12 can be achieved, but the production process becomes more complex
Solution Approach 1:
The patent applies preliminary action by first etherifying the polyglycerol with alkylene oxides to create a modified backbone, and then performing esterification with fatty acids in a subsequent step. This staged approach allows for better control over the final HLB value and simplifies the overall process by separating the hydrophilicity adjustment (etherification) from the surfactant functionality development (esterification)
Solution Approach 2:
The patent uses parameter changes to simplify production by optimizing the etherification conditions - controlling the molar ratio of alkylene oxide to glycerol hydroxyl groups, the reaction temperature, and the catalyst system. By establishing optimized parameter ranges, the process achieves the desired HLB values below 12 without requiring excessively complex production procedures
3Adaptability or versatility
If polyglycerols are used instead of polyalkylene glycols, then renewable raw materials can be utilized, but the surface-active properties are insufficient due to high hydrophilicity
Solution Approach 1:
The patent creates composite molecules by combining the renewable polyglycerol backbone (from biodiesel industry byproducts) with fatty acid chains through esterification. This composite structure integrates the sustainability advantage of polyglycerols with the proven surface-active properties of fatty acid esters, achieving reliable surfactant performance while maintaining renewable material usage
Solution Approach 2:
The patent applies parameter changes by adjusting the degree of etherification and the chain length of fatty acids to optimize surface-active performance. By controlling these parameters, the surfactant properties (HLB value, emulsifying capacity, foam stability) are tuned to match or exceed the performance of conventional polyalkylene glycol-based surfactants
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 process allows for the production of polyglycerol derivatives with adjustable hydrophilicity, achieving high emulsifying performance and surface-active properties similar to fatty alcohol polyglycol ethers, enabling their use in cosmetics and other applications.
Implementation Method 1
reacted with a methylating agent so that the reaction product has a hydroxyl number of at least 100
Implementation Method 2
the polyglycerol methyl ethers thus obtained are then (c) with monocarboxylic acids esterified
Implementation Method 3
the polyglycerol ether esters obtained according to c) are sulfated with a suitable sulfating agent
Data Source
AI summary
New surfactant polyglycerol derivatives are proposed, obtainable by (a) reacting intrinsic condensation products of glycerol with an average degree of condensation of 1.1 to 10 with a methylating agent, such that the reaction product has a hydroxyl number of at least 100, (b) separating the salt formed and optionally subsequently (c) esterifying the polyglycerol methyl ethers thus obtained with monocarboxylic acids having at least 6 carbon atoms and optionally (d1) sulfating the polyglycerol ether esters obtained according to c) with a suitable sulfating agent or (d2) further esterifying the polyglycerol ether esters obtained according to c) with carboxylic acids or their anhydrides selected from the group consisting of monocarboxylic acids, dicarboxylic acids, hydroxycarboxylic acids, succinic anhydride and mixtures thereof or (d3) esterifying the polyglycerol ether esters obtained according to c) with maleic anhydride and optionally subsequently sulfites.