Oxygen-Substituted Sterically Hindered Amine Stabilizers
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Solution Overview
Problem
There is a need for further improvement in the long-term stabilization of organic materials, particularly in polyolefin compositions, where existing oxygen-substituted sterically hindered amine stabilizers are either multi-component mixtures or lack precise control over physical-chemical properties, making them difficult to synthesize and analyze.
Innovation Solution
A specific class of oxygen-substituted sterically hindered amine stabilizers, represented by compounds of formulas I and II, which offer improved long-term stabilization and allow for better control over physical-chemical properties due to their well-defined, single-molecule structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric oxygen-substituted sterically hindered amine stabilizers are used, then stabilization function is provided, but synthesis and analytical characterization become complex due to multi-component mixture nature
Solution Approach 1:
The patent segments the complex polymeric stabilizer mixture into individual molecular components, specifically disclosing discrete oxygen-substituted sterically hindered amine compounds with defined structures (e.g., compounds where R1-R6 are specific alkyl, cycloalkyl, or aryl groups). This segmentation allows each component to be synthesized and characterized independently, reducing overall complexity while maintaining stabilization functionality.
Solution Approach 2:
The patent applies parameter changes by modifying the substitution pattern on the nitrogen atom - specifically introducing oxygen-substituted groups (such as alkoxy groups) at defined positions while controlling the steric hindrance parameters. This allows precise tuning of physical-chemical properties (solubility, stability, effectiveness) for each individual compound, enabling better control over stabilization performance without the complexity of polymeric mixtures.
2Reliability
If existing oxygen-substituted sterically hindered amine stabilizers are used, then some stabilization is achieved, but long-term stabilization performance is insufficient
Solution Approach 1:
The patent systematically varies key parameters including the type of oxygen substitution (alkoxy groups with different chain lengths), the steric hindrance around the nitrogen atom (through different R1-R6 combinations of alkyl, cycloalkyl, and aryl groups), and the molecular weight range. These parameter optimizations enhance the compound's ability to scavenge free radicals and inhibit oxidation over extended periods, achieving superior long-term stabilization compared to existing stabilizers.
Solution Approach 2:
The patent creates composite molecular structures by combining the sterically hindered amine core with specific oxygen-substituted groups and various hydrocarbon chains. This composite approach, where different functional groups work synergistically, enhances both the immediate stabilization effect and the duration of protection against degradation.
3Ease of manufacture
If single-molecule oxygen-substituted sterically hindered amine stabilizers are used, then synthesis and analysis become more manageable, but fine-tuning of physical-chemical properties becomes more challenging
Solution Approach 1:
The patent employs systematic parameter changes across multiple molecular positions (R1-R6 substituents, oxygen substitution patterns, chain lengths) to achieve fine-tuning of physical-chemical properties. By maintaining a consistent single-molecule structure type while varying these parameters, the patent achieves both ease of manufacture (through standardized synthesis routes) and adaptability (through controlled variation of substituents to optimize solubility, stability, and effectiveness for different applications).
Data Source
AI summary
The present invention relates to oxygen-substituted sterically hindered amines of the formulae I or II: (II), wherein, for example, F2, R3, R5, R6, R8, R9, R11, R12, R13, R14 are n-butyl: Z1 to Z10 are propoxy and R1, R4, R7, R10, R13 are 2,2,6,6-tetramethyl-1-propoxy-piperidin-4-yl. Compositions comprising compounds of formulae I or II and an organic material, which is susceptible to oxidative, thermal or light-induced degradation, are further disclosed. Optionally, further additives are contained.