Star-Shaped Polymeric Surfactant for Cold-Process Emulsification
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Solution Overview
Problem
Existing polymeric surfactants used in industrial and personal care applications often require higher molecular weights of the PEG block, resulting in waxy solids that are difficult to handle and process, especially in cold processing of volatile and heat-sensitive ingredients, and may contain residual solvents like xylene, limiting their use in skin contact applications.
Innovation Solution
Development of liquid polymeric surfactants derived from star-shaped polymers, specifically formed by reacting polyhydroxyalkyl acids or hydroxyalkyl acids with alkoxylated core groups, which are then esterified with polyhydroxyalkyl or hydroxyalkenyl carboxylic acids, creating a star block copolymer with a wide range of HLB values suitable for various surfactant properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the molecular weight of the PEG block is increased to improve emulsification effectiveness, then the surfactant becomes a waxy solid that is difficult to handle and process
Solution Approach 1:
The invention changes the molecular weight parameter of the PEG block to a specific range (50-500, preferably 100-400) that optimizes the balance between emulsification effectiveness and liquid state for easy handling. This parameter optimization resolves the contradiction by finding the sweet spot where high effectiveness is achieved without forming waxy solids.
Solution Approach 2:
The invention creates a composite surfactant molecule combining a polyhydroxyalkanoate block (providing hydrophobicity and emulsification capability) with a polyalkylene glycol block (providing hydrophilicity and solubility). This composite structure achieves effective emulsification while maintaining liquid state and ease of handling, resolving the contradiction between effectiveness and operability.
2Reliability
If conventional polymeric surfactants are used to stabilize water-in-oil emulsions, then good emulsion stability is achieved, but residual solvents like xylene limit use in skin contact applications
Solution Approach 1:
The invention extracts and eliminates the harmful residual solvent (xylene) from the surfactant formulation by using a synthesis method that does not require xylene as a solvent. The surfactant is prepared in a solvent-free or water-based system, removing the harmful factor while maintaining emulsion stability through the optimized block copolymer structure.
Solution Approach 2:
The invention changes the synthesis parameters to exclude xylene solvent and uses a different molecular structure (optimized PEG block length and polyhydroxyalkanoate composition) to achieve the same or better emulsion stability without harmful residuals, making the product safe for skin contact applications.
3Ease of operation
If hot processing is used to process polymeric surfactants, then handling is improved, but volatile and heat-sensitive ingredients are degraded
Solution Approach 1:
The invention changes the physical state parameter of the surfactant from solid (requiring heat for processing) to liquid at room temperature by optimizing the PEG block molecular weight and composition. This allows cold processing of volatile and heat-sensitive ingredients while maintaining ease of handling and processing through the liquid state and appropriate viscosity.
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 resulting liquid surfactants are easier to handle and process, offer improved stability in emulsions, and can be used in a wide range of applications including personal care products and industrial formulations without the limitations of residual solvents, providing effective emulsification and dispersion capabilities.
Implementation Method 1
esterified with polyhydroxyalkyl or hydroxyalkenyl carboxylic acids
Data Source
AI summary
A compound of the formula (I) R1. [(AO)n-A OR2]m where: R1 is the residue of a group having at least m active hydrogen atoms where m is at least 2; AO is an alkylene oxide residue; each n is independently from 0 to 100; and each R^ is independently H or an acyl group COR3 where each R3 is independently a residue of a polyhydroxyalkyl or polyhydroxyalkenyl carboxylic acid, a residue of a hydroxyalkyl or hydroxyalkenyl carboxylic acid and/or a residue of an oligomer of the hydroxyalkyl or hydroxyalkenyl carboxylic acid wherein on average at least 2 of R2 is an acyl group. The compounds are particularly suitable for use as emulsifiers and/or dispersants.