Glycerol Formal Transesterification for High Tg Monomers
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Solution Overview
Problem
Current processes for producing (meth)acrylic esters from glycerol formal, an isomer mixture of 5- and 6-membered ring compounds, result in incomplete conversion and unreactive 6-membered ring isomers, leading to low glass transition temperatures and high vapour pressure, making them unsuitable for applications like floor coatings.
Innovation Solution
Reacting glycerol formal with alkyl (meth)acrylate in the presence of titanium alkoxide, zirconium complexes, or tin compounds, along with base catalysts, to achieve a high yield of (meth)acrylate esters with a high six-membered ring content, which ensures complete conversion and low vapour pressure, thereby obtaining polymers with glass transition temperatures comparable to methyl methacrylate and styrene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional esterification or transesterification is used to produce (meth)acrylic esters from glycerol formal, then the 5-membered ring isomer is converted, but the 6-membered ring isomer remains unreactive and unconverted
Solution Approach 1:
The patent changes the reaction parameters by using specific catalysts (titanium alkoxides, zirconium complexes, or tin compounds) and controlling reaction conditions (temperature, molar ratios, reaction time) to enable conversion of both 5-membered and 6-membered ring isomers. The catalyst selection and reaction parameter optimization allow the previously unreactive 6-membered ring isomer to participate in the esterification reaction, achieving complete conversion of the isomer mixture.
2Productivity
If only 5-membered ring derivatives are produced, then the reaction proceeds efficiently, but the glass transition temperature of the polymer is low (about 40°C)
Solution Approach 1:
The patent changes the compositional parameter of the product by enabling formation of both 5-membered ring and 6-membered ring esters in the polymer. The 6-membered ring isomer content (at least 20 mol%) is controlled as a key parameter to achieve the desired glass transition temperature of at least 75°C while maintaining reaction efficiency through optimized catalysis.
3Ease of manufacture
If conventional processes are used, then the reaction can proceed, but the vapour pressure of the monomer mixture is high, making it unsuitable for applications like floor coatings
Solution Approach 1:
The patent changes the molecular structure parameter by producing esters with both 5-membered and 6-membered ring structures, which inherently have lower vapour pressure compared to conventional monomers like methyl methacrylate. This structural modification achieves low vapour pressure suitable for floor coating applications while maintaining ease of manufacture through catalytic processes.
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 results in (meth)acrylate esters with glass transition temperatures of at least 75°C, low vapour pressure, and improved mechanical and longevity properties, making them suitable for coatings, adhesives, and reactive resins with reduced odour and volatile constituents.
Implementation Method 1
Reacting glycerol formal with alkyl (meth)acrylate in the presence of titanium alkoxide, zirconium complexes, or tin compounds, along with base catalysts, to achieve a high yield of (meth)acrylate esters
Data Source
AI summary
A process produces a (meth)acrylate ester mixture. The process includes reacting a glycerol formal isomer mixture with an alkyl (meth)acrylate in the presence of a catalyst.