Polyol-Bound UV Stabilizers for Homogeneous Coating Mixtures
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Solution Overview
Problem
Existing UV absorbers based on benzotriazole derivatives suffer from low solubility and reduced long-term stability, making it difficult to achieve homogeneous mixtures in application products, particularly in coating compositions, and they often require the use of environmentally hazardous solvents.
Innovation Solution
Development of UV absorbers bound to pentaerythritol and trimethylolpropane backbones, which enhance solubility and stability by reacting specific compounds of formulas (I) and (II) to form UV stabilizers with improved solubility in organic solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If UV absorbers are bound to pentaerythritol and trimethylolpropane backbones, then solubility in organic solvents is significantly enhanced, but the molecular structure becomes more complex
Solution Approach 1:
The patent applies composite material principles by combining UV absorber molecules with pentaerythritol and trimethylolpropane backbones to create hybrid structures. These composite molecules integrate the UV-absorbing functionality with polyol backbones, achieving enhanced solubility in organic solvents while maintaining protective functionality. The composite structure allows the molecule to interact more effectively with organic solvent systems.
Solution Approach 2:
The invention changes key molecular parameters including the backbone structure (using pentaerythritol and trimethylolpropane), molecular weight, and functional group composition. By modifying these parameters, the patent achieves improved solubility characteristics without completely redesigning the UV-absorbing core structure, thus balancing complexity and performance.
2Reliability
If existing UV absorbers are used, then they can provide UV protection, but they exhibit low solubility and reduced long-term stability
Solution Approach 1:
By creating composite structures that integrate UV absorbers with stable polyol backbones (pentaerythritol and trimethylolpropane), the patent achieves both improved solubility and enhanced long-term stability. The robust backbone structure provides structural stability while the overall molecular design maintains compatibility with organic solvent systems, resolving the contradiction between solubility and stability.
3Stability of the object's composition
If homogeneous mixtures are required in coating compositions, then adequate solubility is necessary, but existing UV absorbers have low solubility making homogeneous mixing difficult
Solution Approach 1:
The patent modifies molecular parameters including backbone selection (pentaerythritol, trimethylolpropane), molecular weight distribution, and functional group types to optimize solubility. These parameter changes enable the UV absorbers to form homogeneous mixtures in coating compositions without requiring excessive solvent or complex processing conditions.
Data Source
AI summary
The presently claimed invention is directed to a product, or a salt thereof obtainable by a process comprising at least the step of: a) reacting at least one compound of formula (I) wherein G* is selected from formula (A), or formula (B) b) with at least one compound of formula (II), and the use of said product as ultraviolet stabilizer, e.g. in a method of protecting a material or coating from light.