Metal Salts of Malonic Acid as Nucleating Agents
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Solution Overview
Problem
Existing nucleating agents for polyolefins, such as polypropylene and polyethylene, face compatibility issues with additives, exhibit inconsistent dispersion, and have high hygroscopicity, leading to processing problems and reduced performance in thermoplastic articles.
Innovation Solution
The development of metal salts of malonic acid derivatives as α-nucleating agents, which are easily dispersed, exhibit low hygroscopicity, and maintain compatibility with polyolefin additives, thereby enhancing crystallization temperature and stiffness without complex synthesis steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional nucleating agents are used in polyolefins, then crystallization temperature can be increased, but compatibility issues with additives and high hygroscopicity occur leading to processing problems
Solution Approach 1:
The patent changes the chemical parameters of nucleating agents by using metal salts of malonic acid derivatives with specific molecular structures (Formula I) where R1 and R2 are hydrogen, alkyl, aryl, alkylaryl, halogen, or cycloalkyl groups. This structural modification achieves both high crystallization temperature (120-140°C) and low hygroscopicity, resolving the contradiction between temperature improvement and processing reliability.
Solution Approach 2:
The invention creates composite nucleating agents comprising metal salts (such as calcium, magnesium, barium, zinc, or aluminum salts) of malonic acid derivatives combined with polyolefin-compatible structures. This composite approach ensures both the nucleation function (high Tc) and compatibility with polyolefin additives, eliminating processing problems associated with conventional agents.
2Productivity
If existing nucleating agents are employed, then cycle time reduction can be achieved, but inconsistent dispersion and high hygroscopicity cause processing issues
Solution Approach 1:
The patent modifies the hydrophilicity parameter of nucleating agents by using metal salts of malonic acid derivatives which exhibit low hygroscopicity. This parameter change ensures consistent dispersion in polyolefin matrices during processing, maintaining compositional stability while achieving the desired cycle time reduction through enhanced nucleation activity.
Solution Approach 2:
The invention achieves homogeneous dispersion by designing nucleating agents with polyolefin-compatible molecular structures. The metal salts of malonic acid derivatives distribute uniformly in the polymer matrix, ensuring consistent nucleation performance and compositional stability throughout the material, which enables reliable cycle time reduction.
3Temperature
If traditional nucleating agents are used, then crystallization temperature increases, but hygroscopicity leads to processing problems and reduced performance
Solution Approach 1:
The patent converts the typically harmful hygroscopic property into a beneficial low-hygroscopicity feature by selecting metal salts of malonic acid derivatives. These compounds maintain high crystallization temperature promotion while exhibiting minimal water absorption, thereby eliminating processing problems such as moisture-induced defects and performance degradation.
Solution Approach 2:
The invention changes the hygroscopicity parameter of nucleating agents by using metal salts with specific chemical structures (Formula I). This parameter modification reduces water affinity while maintaining nucleation efficiency, allowing the agent to increase peak crystallization temperature without introducing hygroscopicity-related processing problems.
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 metal salts of malonic acid derivatives effectively increase peak crystallization temperature and flexural modulus, reduce haze, and improve processing efficiency by ensuring consistent dispersion and stability in polyolefin formulations.
Implementation Method 1
These metal salts of malonic acid derivatives are useful as α-nucleating agents to improve properties of thermoplastic polymers or articles
Implementation Method 2
provide higher crystallization temperature
Data Source
AI summary
The present invention provides a metal salt of malonic acid derivative compound having chemical formula (1) as an α-nucleating agent and process for preparing the same. The present invention also provides a polymer additive and thermoplastic composition comprising the metal salt of malonic acid derivative compound having chemical formula (I).