Benzene Dimethanol Polyether Coating for Food Containers
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Solution Overview
Problem
Existing coatings for food and beverage containers based on polyglycidyl ethers of bisphenol A, such as BPA and BADGE, raise health concerns due to potential chemical leaching, necessitating the development of alternatives that are safe for food contact and maintain commercially acceptable properties.
Innovation Solution
A polyether composition derived from benzene dimethanol, modified with hydroxy aromatic carboxylic acids and diglycidyl ethers, which is then grafted to a (meth)acrylic polymer, providing a safe and effective coating for food-contacting surfaces without extractable BPA or BADGE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyglycidyl ethers of bisphenol A (BPA, BADGE) are used in coating compositions, then excellent adhesion and commercially acceptable properties are achieved, but health risks arise due to potential chemical leaching into food
Solution Approach 1:
The patent removes the harmful bisphenol A component from the coating composition while retaining the beneficial polyglycidyl ether structure. This is achieved by synthesizing polyglycidyl ethers from alternative starting materials that do not contain BPA, thereby extracting the harmful substance while preserving the functional properties needed for adhesion and performance
Solution Approach 2:
The patent introduces intermediate compounds in the synthesis pathway that allow production of polyglycidyl ethers without using BPA. These intermediate structures serve as mediators to achieve the desired epoxy resin properties through alternative chemical routes that bypass the harmful BPA step
2Object-affected harmful factors
If alternative polyether compositions are developed to eliminate BPA, then safety for food contact is improved, but adhesion and commercially acceptable properties may be compromised
Solution Approach 1:
The patent modifies the chemical parameters of the polyether structure by changing the aromatic component from BPA to alternative phenolic compounds. This parameter change maintains the polyglycidyl ether backbone and epoxy functionality while altering the core structure to eliminate BPA, thereby preserving adhesion properties through structural similarity and functional group retention
Solution Approach 2:
The patent creates composite coating formulations that combine alternative polyether resins with crosslinking agents and other coating components. This composite approach allows the alternative polyether to achieve comparable adhesion and performance properties through synergistic interactions with other formulation ingredients, compensating for any differences from traditional BPA-based systems
Data Source
AI summary
Containers comprising a food-contacting surface and a coating thereon are disclosed. The coating comprises polyethers derived from benzene dimethanol.