Acrylate-Free O/W Emulsion for Stable Fast-Absorbing Cosmetics
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Solution Overview
Problem
Existing acrylate-based polymers in cosmetic O/W emulsions are criticized for their unclear biodegradability, leading to stability issues and residue formation, while polysaccharide-based alternatives often result in phase separation and slow absorption.
Innovation Solution
An acrylate-free O/W emulsion using sodium stearoyl glutamate, alkali metal alkyl sulfates, alkali metal alkyl phosphates, hydroxypropyl starch phosphate, and glycerol or sorbitan monostearate stabilizes the emulsion, allowing for rapid absorption and reduced residue formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If acrylate-based polymers are used to stabilize O/W emulsions, then long-term stability is achieved, but biodegradability is unclear and environmental harm increases
Solution Approach 1:
The patent changes the chemical composition parameters by replacing acrylate-based polymers with polysaccharide-based polymers (hydroxypropyl starch phosphate, xanthan gum, carrageenan). This substitution maintains emulsion stability while improving biodegradability and environmental compatibility, directly addressing the harmful factors associated with acrylate polymers
Solution Approach 2:
The patent uses composite formulations combining multiple polysaccharide-based polymers (hydroxypropyl starch phosphate with xanthan gum or carrageenan) along with specific emulsifiers (glycerol monostearate, sorbitan monostearate) and surfactants. This composite approach achieves stable emulsions with high oil phases (5-30%) while ensuring biodegradability, resolving the contradiction between stability and environmental harm
2Object-affected harmful factors
If polysaccharide-based polymers are used as alternatives, then biodegradability improves, but phase separation occurs and long-term stability is lost
Solution Approach 1:
The patent merges multiple polysaccharide-based polymers (hydroxypropyl starch phosphate with xanthan gum or carrageenan) and combines them with specific emulsifiers (glycerol monostearate, sorbitan monostearate) and surfactants (sodium stearoyl glutamate, alkali metal alkyl sulfates, alkali metal alkyl phosphates). This combination creates a synergistic effect that prevents phase separation and ensures long-term stability while maintaining biodegradability
Solution Approach 2:
The composite formulation includes polysaccharide polymers (0.1-5%), emulsifiers (0.1-5%), and surfactants (0.01-5%), creating a multi-component system that achieves both biodegradability and stability, even with high oil phases (5-30%), preventing the phase separation issue
3Object-affected harmful factors
If polysaccharide-based polymers are used, then environmental compatibility improves, but absorption speed decreases and residue formation increases
Solution Approach 1:
The patent changes the molecular and physical parameters of the formulation by using specifically modified polysaccharides (hydroxypropyl starch phosphate) with controlled molecular weights and degrees of substitution, combined with emulsifiers and surfactants. These parameter changes improve absorption speed and reduce residue formation while maintaining environmental compatibility
Solution Approach 2:
The patent applies local quality optimization by selecting specific polysaccharide derivatives with particular properties (hydroxypropyl starch phosphate) and combining them with specific emulsifiers and surfactants in optimized concentrations. This localized optimization of formulation components achieves rapid absorption and minimal residue while preserving biodegradability
4Quantity of substance
If high oil phases (more than 5% by weight) are present in the emulsion, then product richness improves, but phase separation occurs when using polysaccharide-based polymers
Solution Approach 1:
The patent uses composite formulations combining polysaccharide-based polymers (hydroxypropyl starch phosphate, xanthan gum, carrageenan) with specific emulsifiers (glycerol monostearate, sorbitan monostearate) and surfactants (sodium stearoyl glutamate, alkali metal alkyl sulfates, alkali metal alkyl phosphates). This composite system can stabilize emulsions with high oil phases (5-30%) without phase separation, enabling product richness while maintaining stability
Solution Approach 2:
The patent merges multiple functional components (polysaccharide polymers, emulsifiers, surfactants) to create a synergistic system capable of stabilizing high oil phase content (5-30%). The combination of these materials works together to prevent phase separation even at high oil concentrations, resolving the contradiction between richness and stability
Data Source
AI summary
Acrylate-free cosmetic O/W emulsion containing: at least one substance selected from the group sodium stearoyl glutamate, alkali metal alkyl sulphates, and alkali metal alkyl phosphates, wherein the alkyl group in each case has 16 to 18 carbon atoms; hydroxypropyl starch phosphate; and glycerol monostearate and/or sorbitan monostearate.