Polyester coating compositions containing polymers derived from cyclic carbonates
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Solution Overview
Problem
Current polyester-based coatings for food and beverage containers face challenges in achieving a balance between corrosion resistance, flexibility, and fabrication properties, with existing formulations often compromising on one or more of these aspects, and there is a desire to reduce or eliminate bisphenol A and epoxy compounds due to safety concerns.
Innovation Solution
Development of a coating composition comprising a polyester polymer derived from esterifying an aryloxy ether polyol, which is formed by reacting a polyhydric phenol or polyphenol with a non-hydroxyl functional cyclic carbonate, combined with a crosslinker and optional catalyst, providing a food-contact surface with improved adhesion, corrosion resistance, and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyester-based coatings are formulated to achieve good corrosion resistance, then corrosion protection is improved, but flexibility and adhesion deteriorate
Solution Approach 1:
The patent modifies the chemical composition parameters of the polyester coating by incorporating specific polyols (polyester polyols, polycarbonate polyols, polyether polyols) in controlled ratios and using novel polyester polymers with specific molecular weights and functionalities, achieving optimal balance between corrosion resistance and flexibility
Solution Approach 2:
The coating composition uses a composite polyester system combining multiple polyol types and polyester polymer variants to achieve synergistic effects, where the combination of different polymer components provides both corrosion resistance and flexibility simultaneously
2Strength
If polyester-based coatings are formulated to achieve good flexibility, then flexibility is improved, but corrosion resistance deteriorates
Solution Approach 1:
The patent adjusts the molecular weight and chain structure parameters of the polyester polymer to achieve optimal flexibility while maintaining corrosion resistance through careful selection of polyol components
3Reliability
If bisphenol A and epoxy compounds are used in coating formulations, then coating performance is improved, but safety concerns arise
Solution Approach 1:
The patent removes bisphenol A and epoxy compounds from the coating formulation and replaces them with alternative polyester polymers and polyols that provide similar performance benefits without the associated safety concerns
Solution Approach 2:
The patent uses alternative polyester polymers and polyols that can be degraded or removed more easily than traditional epoxy systems, reducing long-term safety concerns
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 solution achieves a desirable balance of adhesion, corrosion resistance, and flexibility in the coating, while being substantially free of bisphenol A and epoxy compounds, ensuring the coating's integrity and safety for food contact applications.
Implementation Method 1
reacting a polyhydric phenol or polyphenol with a non-hydroxyl functional cyclic carbonate
Implementation Method 2
a polyester polymer derived by esterifying an aryloxy ether polyol
Implementation Method 3
a crosslinker and an optional catalyst
Data Source
AI summary
A coating composition is provided that includes (a) a polyester polymer derived by esterifying an aryloxy ether polyol (e.g., an aryloxy ether diol) derived from reaction between a polyhydric phenol or a polyphenol and a non-hydroxyl functional cyclic carbonate, or from reaction between a monophenol and a hydroxyl functional cyclic carbonate; (b) a crosslinker and (c) an optional catalyst.