Polyether Container Coatings Without BPA for Corrosion Resistance

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Solution Overview

Problem

Existing packaging coatings for metal containers, particularly those used in food and beverage cans, face challenges such as corrosion, contamination of contents, and the presence of estrogenic agonist compounds like BPA, which are problematic for health and recycling.

Innovation Solution

A polyether polymer-based coating composition that does not include structural units derived from bisphenol A or other estrogenic agonists, providing a binder system with improved adhesion, corrosion resistance, and flexibility, suitable for high-speed application and long-term use in harsh environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If epoxy-based coatings incorporating BPA are used, then adhesion and corrosion resistance are improved, but health safety deteriorates due to estrogenic agonist activity

Engineering Contradiction:

Improvecorrosion resistanceVSAvoidestrogenic agonist activity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical parameters of the binder system by using alternative polymers (polyester, acrylic, vinyl) with modified molecular structures that eliminate polyhydric phenols and BPA while maintaining coating performance through adjusted composition ratios and curing mechanisms

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention extracts and removes the harmful components (BPA, polyhydric phenols with estrogenic activity) from the coating formulation while retaining the essential protective functions through alternative binder chemistry that does not rely on these problematic substances

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If polyvinyl chloride-based coatings are used, then coating performance is achieved, but recyclability deteriorates

Engineering Contradiction:

Improvecoating performanceVSAvoidrecyclability

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the chemical composition parameters by substituting halide-containing polymers with halogen-free alternatives, fundamentally altering the material properties to enable recyclability while preserving protective coating functions

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention facilitates the discarding of problematic halogenated materials and enables recovery/recycling of metal substrates by using coating compositions that do not interfere with recycling processes

Inventive Principle:

Principle #34Discarding and recovering

3Object-affected harmful factors

If conventional binder systems are eliminated, then health safety is improved, but adhesion and film integrity may deteriorate

Engineering Contradiction:

Improvefood contact safetyVSAvoidadhesion

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The patent creates composite coating formulations combining multiple polymer types (polyester, acrylic, vinyl) with crosslinking agents and functional additives to achieve the necessary adhesion strength and film integrity without relying on BPA-based epoxy systems

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention introduces intermediary substances such as crosslinking agents and adhesion promoters that mediate between the alternative binder polymers and the metal substrate to ensure adequate bonding performance

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20260092193A1Compositions for containers and other articles and methods of using same

Publication Date: 2026.04.02 SWIMC LLC

AI summary

This invention provides a polymer, which is preferably a polyether polymer. The polymer may be uses in coating compositions. Containers and other articles comprising the polymer and methods of making such containers and other articles are also provided. The invention further provides compositions including the polymer (e.g., powder coatings), which have utility in a variety of coating end uses, including, for example, valve and pipe coatings.