Aminosiloxane Ester Copolymer Synthesis for Hair Care Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing amine-terminated polyorganosiloxanes for hair care applications face issues such as instability, high costs, and the presence of residual impurities like SiH or allylamine, which are undesirable for hair care products.
Innovation Solution
The development of an aminosiloxane ester copolymer, specifically formulated and processed using a combination of terminal primary amino-functional polyorganosiloxanes and bis-acryloyloxy-alkanes, which are reacted under controlled conditions to produce a stable and efficient hair care product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If amine-terminated polyorganosiloxanes are made by condensation, then the product can be obtained, but the product suffers from instability as shown by viscosity changes and development of ammonia odor after aging
Solution Approach 1:
The invention changes the chemical structure parameters by incorporating ester groups into the polyorganosiloxane chain, creating an aminosiloxane ester copolymer with improved stability. The specific parameter change is the introduction of ester linkages between the siloxane backbone and amino groups, which prevents the degradation pathways that cause ammonia odor and viscosity changes in traditional amine-terminated polyorganosiloxanes.
2Reliability
If primary amine terminated polyorganosiloxanes are made by equilibration, then the product can be obtained, but the process is expensive requiring costly starting materials and catalysts and multiple process steps
Solution Approach 1:
The invention segments the synthesis process into simpler steps using readily available starting materials. Instead of requiring complex equilibration processes with expensive catalysts, the method uses straightforward condensation reactions between amino-functional siloxanes and acrylate esters, reducing both the number of steps and the cost of materials required.
Solution Approach 2:
The invention employs inexpensive, commercially available starting materials such as amino-functional polydimethylsiloxane and acrylate esters, replacing the costly starting materials and catalysts traditionally required for synthesizing primary amine terminated polyorganosiloxanes. This approach uses cheap, easily obtainable chemicals to achieve the desired product.
3Productivity
If allylamine or its derivatives are used for hydrosilylation chemistry, then amine-terminated polyorganosiloxanes can be formed, but the product contains residual SiH or allylamine that must be removed through extensive washing
Solution Approach 1:
The invention converts the potential harm of residual impurities into a benefit by designing a synthesis pathway that inherently produces a stable, non-reactive end product. The aminosiloxane ester copolymer structure ensures that no residual SiH or allylamine groups remain after reaction, as the esterification process completes the chemical transformation, eliminating the need for extensive washing steps to remove impurities.
4Productivity
If ammonolysis of chloropropyl terminated siloxanes is used, then amine-terminated polyorganosiloxanes can be produced, but residual ammonium chloride salt remains requiring extensive washing to remove
Solution Approach 1:
The invention takes out the problematic salt formation step from the synthesis pathway. By using direct condensation between amino-functional siloxanes and acrylate esters, the method eliminates the ammonolysis reaction that produces ammonium chloride salt. The esterification reaction produces only water as a byproduct, which can be easily removed without extensive washing, thus extracting the harmful salt formation step from the process.
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 aminosiloxane ester copolymer provides enhanced stability and performance in hair care applications, eliminating the drawbacks of previous methods such as viscosity changes and ammonia odor, while ensuring the removal of residual impurities, thus offering a cost-effective and sustainable solution.
Implementation Method 1
When amine compound and acryl compound are mixed, there is a reaction which produces an acryl functional silicon compound. This reaction is known as the Michael-type addition.
Implementation Method 2
An emulsion comprises: (I) a liquid continuous phase comprising water, and (II) a discontinuous phase dispersed in the liquid continuous phase
Data Source
AI summary
An aminosiloxane ester copolymer, an emulsion containing the copolymer, and processes for making the copolymer and the emulsion are provided. The copolymer and the emulsion may be formulated into hair care compositions, such as conditioners and styling products.