Polyether Binder Coatings for BPA-Free Metal Container Protection

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Solution Overview

Problem

Current packaging coatings for metal containers, particularly those used in food and beverage packaging, face challenges such as corrosion, contamination risks, and the presence of estrogenic agonist compounds like BPA, which require a more effective and safer binder system that does not include structural units derived from bisphenol A or other polyhydric phenols with estrogenic activity.

Innovation Solution

A polyether polymer binder system is developed, which excludes structural units from bisphenol A, bisphenol F, bisphenol S, or their diepoxides, and other polyhydric phenols with estrogenic agonist activity, featuring aromatic ether segments, bulky substituents, and specific molecular structures to prevent estrogenic activity, and is used in a coating composition for metal packaging containers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If epoxy-based coatings incorporating BPA are used, then corrosion protection and adhesion are improved, but health safety concerns arise due to estrogenic activity

Engineering Contradiction:

Improvecorrosion protectionVSAvoidestrogenic activity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent modifies the chemical structure of phenolic compounds by replacing BPA with alternative phenolic structures that have reduced or eliminated estrogenic activity while maintaining the desired coating performance properties such as corrosion resistance and adhesion

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses composite polymer systems combining polyester polymers with modified phenolic compounds to achieve both protective performance and safety requirements, creating a multi-component coating formulation that balances functionality and health safety

Inventive Principle:

Principle #40Composite materials

2Reliability

If polyvinyl chloride-based coatings are used, then coating performance is achieved, but recycling becomes problematic

Engineering Contradiction:

Improvecoating performanceVSAvoidrecyclability

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent transitions from polyvinyl chloride polymer chemistry to polyester polymer chemistry, fundamentally changing the material composition to enable recyclability while maintaining coating performance through careful selection of polyester backbone structures and crosslinking mechanisms

Inventive Principle:

Principle #35Parameter changes

3Reliability

If coatings with high chemical resistance are used, then corrosion protection is improved, but food safety concerns arise from potential contamination

Engineering Contradiction:

Improvecorrosion protectionVSAvoidfood contact safety

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent creates a coating system where the polymer matrix and crosslinking agents are specifically selected to provide chemical resistance at the metal-coating interface while ensuring that the food-contact surface consists of food-safe, non-migrating components

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The coating acts as an intermediary barrier layer between the metal substrate and food contents, using carefully selected polyester and phenolic compounds that provide corrosion protection to the metal while presenting a safe, non-reactive surface to food products

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11634607B2Compositions for containers and other articles and methods of using same

Publication Date: 2023.04.25 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.