Polyester Coating Composition for Heat-Resistant Flexible Cookware
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Solution Overview
Problem
Existing heat-resistant coatings for cookware and bakeware are often brittle, prone to crack-based defects, and rely on non-aqueous solvents that are subject to environmental regulations.
Innovation Solution
A water-based coating composition formulated with a polyester polymer synthesized from a specific molar ratio of terephthalic acid to isophthalic acid, carboxylic acid functional groups, and a weight average molecular weight of at least 5000 Daltons, providing a flexible and non-stick coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fluoropolymer-based or non-fluoropolymer coating compositions are used, then heat resistance is achieved, but the coating becomes brittle and prone to crack-based defects
Solution Approach 1:
The patent modifies the chemical composition parameters of the coating by using polyester polymers with specific molecular weight ranges (5,000 to 500,000 Daltons) and controlled acid values (15 to 65), replacing traditional fluoropolymer compositions. This parameter change maintains heat resistance while improving flexibility and reducing brittleness.
Solution Approach 2:
The patent employs composite coating formulations that combine polyester polymers with specific additives and curing agents to create a multi-component system. This composite approach integrates the thermal stability of polyester with flexibility-enhancing modifiers, achieving both heat resistance and crack resistance.
2Reliability
If non-aqueous solvents such as NMP are used in coating formulations, then coating performance is achieved, but environmental regulations become stricter
Solution Approach 1:
The patent changes the solvent system parameter from non-aqueous solvents (NMP) to aqueous-based formulations. This substitution maintains coating performance through careful selection of water-soluble polyester polymers and appropriate pH control, while eliminating the environmental concerns associated with NMP.
3Duration of action of stationary object
If polyester polymer with high molecular weight is used, then coating durability is improved, but application viscosity increases
Solution Approach 1:
The patent optimizes the molecular weight parameter of the polyester polymer within a specific range (5,000 to 500,000 Daltons) and controls the acid value (15 to 65) to balance durability and processability. This parameter optimization ensures sufficient molecular weight for durability while maintaining viscosity at levels suitable for standard coating applications.
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 coating composition achieves high heat resistance, flexibility, and non-stick properties while avoiding the use of fluoropolymers and minimizing environmental impact through the use of aqueous solvents.
Implementation Method 1
reacting, in a first stage at temperature of 80° C. to 240° C. in the presence of a catalyst, an alcohol component including a diol component and a polyol component and an acid component including terephthalic acid and isophthalic acid
Implementation Method 2
a coating on the substrate, the coating including polyester and having at least one of: a glass transition temperature of at least 80° C. as determined by dynamic scanning calorimetry (DSC)
Data Source
AI summary
A polyester polymer is polymerized from an alcohol component including a diol and a polyol and an acid component including terephthalic acid and isophthalic acid, with the terephthalic acid and isophthalic acid present in a desired molar ratio. The polyester polymer also includes carboxylic acid functional groups, a weight average molecular weight (MW) of at least 5000 Daltons (Da), and an acid value (AV) of 40 to 65. The polyester polymer may be formulated into a water-based coating composition for substrates such as articles of cookware to form a coating that is highly heat resistant and flexible while also providing non-stick properties with good release.