Solvent-Based Adhesive Composition for Bisphenol-A-Free Laminates
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Solution Overview
Problem
Solvent-based adhesive compositions used in high-performance laminate applications face challenges due to the regulatory and safety concerns associated with bisphenol-A-based materials, necessitating the development of bisphenol-A-free alternatives that maintain heat, moisture, and chemical resistance.
Innovation Solution
A solvent-based adhesive composition comprising a polyester-urethane resin modified with a phosphate ester compound and an aliphatic isocyanate curing agent, which forms a polyester-urethane-polyurethane polymer network, providing improved adhesion and resistance suitable for high-performance applications like retort, hot-fill, and boil-in-bag processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bisphenol-A-based polyester systems are used to achieve high-performance laminate applications, then heat, moisture, and chemical resistance are improved, but regulatory and safety concerns arise regarding food packaging
Solution Approach 1:
The patent removes bisphenol-A from the adhesive composition entirely, extracting the harmful substance while maintaining the desired performance characteristics through alternative chemical components that do not raise safety concerns for food packaging applications
Solution Approach 2:
The invention uses a composite adhesive system combining polyester-urethane resin with phosphate ester compound and aliphatic isocyanate curing agent, creating a multi-component formulation that achieves the heat, moisture, and chemical resistance previously provided by bisphenol-A-based systems without the associated safety issues
2Reliability
If conventional solvent-based polyurethane adhesives are used, then good heat, moisture, and chemical resistance is achieved, but adhesion to metal structures such as foil is insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive by incorporating phosphate ester compound, which changes the adhesive's interaction properties with metal surfaces, thereby improving adhesion strength while preserving the heat, moisture, and chemical resistance characteristics
Solution Approach 2:
The invention creates a composite adhesive formulation that combines polyester-urethane resin with phosphate ester compound and aliphatic isocyanate curing agent, where the phosphate ester component specifically enhances metal adhesion while the polyester-urethane matrix maintains resistance to heat, moisture, and chemicals
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 adhesive composition offers enhanced adhesion and resistance to heat and chemicals, making it suitable for bisphenol-A-free high-performance laminate structures, particularly in food packaging applications, while ensuring safety and performance.
Implementation Method 1
The aliphatic isocyanate curing agent (C) of the second part crosslinks the components of the first part
Implementation Method 2
improved heat and chemical resistance
Implementation Method 3
improved heat and chemical resistance
Implementation Method 4
improved adhesion to metal structures, such as foil
Data Source
AI summary
Solvent-based adhesive composition are disclosed, the compositions comprising (A) a polyester-urethane resin, (B) a phosphate ester compound, and (C) an aliphatic isocyanate curing agent. Methods for preparing a solvent-based adhesive composition, the methods comprising providing a polyester-urethane resin, providing a phosphate ester compound, mixing the polyester-urethane resin and phosphate ester compound to form a resin mixture, diluting the resin mixture in a solvent to form a diluted resin mixture having an application solid content of from 25 to 55 weight percent, based on the total weight of the diluted resin mixture, and curing the diluted resin mixture with an aliphatic isocyanate curing agent at a mix ratio (parts by weight resin mixture before dilution:parts by weight aliphatic isocyanate curing agent) of from 100:1 to 100:12. Laminates prepared comprising the solvent-based adhesives and according to the disclosed methods are also disclosed.