Pyrrolidone-Free PUI Coating Composition for Low-Temperature Curing
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Solution Overview
Problem
Existing polyurethane imide (PUI) resins used in coatings for food and beverage containers contain hazardous pyrrolidone solvents and require high curing temperatures, which are undesirable for safety and environmental reasons.
Innovation Solution
A coating composition comprising a polyurethane imide (PUI) resin, optionally with a crosslinking material, that is substantially free of pyrrolidone solvents and can be cured at lower temperatures, maintaining properties such as high speed application, excellent adhesion, and safety for food contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pyrrolidone solvents are used in PUI resin synthesis, then the resin can be produced with desired properties, but the coating becomes hazardous to human health and environment
Solution Approach 1:
The patent removes pyrrolidone solvents from the coating composition entirely, extracting the harmful component while maintaining the essential PUI resin functionality through alternative solvent systems or solvent-free formulations
Solution Approach 2:
The patent modifies the chemical composition parameters by substituting pyrrolidone with safer alternative solvents or by adjusting the resin formulation to eliminate solvent requirements, thereby changing the safety profile while preserving performance
2Reliability
If high curing temperatures (above 200°C) are used, then the coating achieves proper curing and adhesion, but energy consumption increases and environmental impact worsens
Solution Approach 1:
The patent changes the curing temperature parameter from high (above 200°C) to lower temperatures, achieving proper coating curing and adhesion through modified resin chemistry or catalytic systems that enable low-temperature crosslinking
Solution Approach 2:
The patent replaces thermal energy input with alternative curing mechanisms such as chemical catalysis or UV irradiation, substituting the mechanical/thermal curing process with a different energy pathway that requires less overall energy
3Object-affected harmful factors
If pyrrolidone-free PUI resin is developed, then safety and environmental friendliness improve, but coating performance may be compromised
Solution Approach 1:
The patent adjusts the chemical parameters of the PUI resin formulation to achieve optimal performance without pyrrolidone, modifying molecular weight, functional group composition, or crosslink density to compensate for the absence of pyrrolidone-based processing
Solution Approach 2:
The patent creates a composite coating system combining PUI resin with complementary materials or additives that enhance performance properties while maintaining the pyrrolidone-free formulation, achieving synergistic effects that preserve adhesion and durability
Data Source
AI summary
A coating composition comprising: (a) a polyurethane imide (PUI) resin, and (b) optionally a crosslinking material; wherein the coating composition is substantially free of pyrrolidone solvents. The invention extends to a package coated on at least a portion thereof with a coating, the coating being derived from said coating composition.