Polyhydroxyalkylamide Crosslinkers for Solvent-Based Coatings
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Solution Overview
Problem
Current crosslinkers in coating compositions, particularly polyhydroxyalkylamide materials, are often insoluble in solvents, limiting their use in solvent-based coatings, and many industries aim to reduce or eliminate formaldehyde-based crosslinkers due to health and environmental concerns.
Innovation Solution
Development of a polyhydroxyalkylamide material with a specific formula (I) that is soluble in solvents, allowing its use in coating compositions, and a method involving the reaction of an acrylic pre-polymer with a diacid and alkanolamine to produce a crosslinker that can react with film-forming resins, eliminating the need for formaldehyde.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If formaldehyde-based crosslinkers are used, then crosslinking effectiveness is improved, but health and environmental safety deteriorates
Solution Approach 1:
The invention extracts and eliminates the harmful formaldehyde component from the crosslinking system while retaining the essential crosslinking functionality through alternative polyhydroxyalkylamide crosslinkers that do not rely on formaldehyde chemistry
Solution Approach 2:
The invention changes the chemical composition parameters of the crosslinker from formaldehyde-based to polyhydroxyalkylamide-based structures, fundamentally altering the chemical mechanism while maintaining the crosslinking function
2Reliability
If small molecule polyhydroxyalkylamide crosslinkers are used, then crosslinking functionality is improved, but solubility in solvents deteriorates
Solution Approach 1:
The invention creates composite molecular structures that combine the crosslinking-functional polyhydroxyalkylamide core with solvent-compatible structural elements, achieving both crosslinking functionality and solvent solubility simultaneously
Solution Approach 2:
The invention applies local quality modification by introducing specific structural features at different parts of the crosslinker molecule - the polyhydroxyalkylamide portion provides crosslinking functionality while other portions provide solvent compatibility
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 soluble polyhydroxyalkylamide material enables the creation of effective, formaldehyde-free coating compositions that can be used in various applications, including food and beverage packaging, providing improved performance and safety.
Implementation Method 1
reacting an acrylic pre-polymer derived from monomers having ethylenic unsaturation, said acrylic pre-polymer having at least two epoxy group(s), and/or a diepoxide with the reaction product of a diacid and an alkanolamine
Implementation Method 2
a polyhydroxyalkylamide material having the formula (I)... R represents a hydroxyalkylamide group... n is at least 2
Data Source
AI summary
A polyhydroxyalkylamide material having the formula (I), wherein Z represents a polymer or an alkylene, alkenylene, alkynylene or arylene group; Z′ represents a bivalent organic linking group; m is 0 or 1; X represents a bivalent organic bridging group; R represents a hydroxyalkylamide group; and n is at least 2. The present invention extends to coatings compositions containing the polyhydroxyalkylamide material and articles coated with coatings derived from said coated compositions.