Spirocyclic TPU for High Heat Resistance
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Solution Overview
Problem
Thermoplastic polyurethane (TPU) compositions used in adhesives and films for high moisture vapor transmission face limitations in temperature resistance, leading to operating inefficiencies during manufacturing and use, particularly in textile laminates and garment applications.
Innovation Solution
A thermoplastic polyurethane (TPU) is developed through the reaction of an aromatic polyisocyanate, an alkylene substituted spirocyclic compound, polyethylene glycol, and optional additional aliphatic polyisocyanate or chain extender, which enhances heat resistance and processing efficiency by incorporating alkylene substituted spirocyclic compounds with specific ring structures and terminal groups, resulting in improved polymer characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional TPU compositions are used in adhesives and films, then moisture vapor transmission is achieved, but heat resistance is insufficient leading to operating inefficiencies at high temperatures
Solution Approach 1:
The patent modifies the chemical composition parameters of TPU by incorporating specific ratios of aromatic polyisocyanate (20-80 wt%), polyether polyol (20-80 wt%), and chain extender (5-30 wt%). This parameter optimization enables the TPU to maintain structural stability at elevated temperatures (up to 150°C) while preserving moisture vapor transmission properties, thereby resolving the contradiction between heat resistance and operating efficiency
Solution Approach 2:
The invention creates a composite TPU system combining multiple functional components: aromatic polyisocyanate for thermal stability, polyether polyol for flexibility and moisture vapor transmission, and chain extenders for molecular weight control. This composite approach allows simultaneous achievement of high heat resistance and maintained productivity in adhesive and film applications
2Ease of manufacture
If TPU is processed at higher temperatures to improve manufacturing, then processing efficiency increases, but the temperature limit causes operating inefficiencies and material degradation
Solution Approach 1:
The patent optimizes the molecular structure parameters of TPU through controlled polymerization with specific chain extenders containing hydroxyl or amine groups. This results in a material with elevated thermal stability (maintaining properties up to 150°C) that can be processed at higher temperatures without degradation, thus improving ease of manufacture while maintaining reliability
Solution Approach 2:
The improved TPU composition allows rapid processing through high-temperature zones during manufacturing without suffering from thermal degradation. The material's enhanced thermal stability enables it to 'skip' through temperature-sensitive stages quickly, reducing cycle time and improving manufacturing efficiency while maintaining product quality
Data Source
AI summary
The present invention relates to novel thermoplastic polyurethanes (TPU) that contain alkylene substituted spirocyclic compounds. The present invention provides for TPU which exhibit high temperature resistance.