Solvent-less Adhesive Composition for Laminates
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Solution Overview
Problem
Solvent-less adhesives used in laminates often exhibit poor adhesion after chemical aging and high-temperature testing, leading to defects such as bubbling and delamination, making them unsuitable for applications like food packaging and deep-drawn cans.
Innovation Solution
A two-component solvent-less adhesive composition is developed, comprising the reaction product of an isocyanate component and a polyol component containing a polyester-polycarbonate polyol and a phosphate-terminated polyol, which is formed by reacting these components to create a robust adhesive bond.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If solvent-less adhesive is used, then environmental safety and simplicity are improved, but adhesion strength after chemical aging and high-temperature testing deteriorates
Solution Approach 1:
The patent uses a composite polyol system combining polyester-polycarbonate polyol and phosphate-terminated polyol with an isocyanate component. This composite adhesive formulation maintains the solvent-less environmental benefit while achieving reliable adhesion after chemical aging and high-temperature testing through synergistic interactions between the different polyol components and isocyanate crosslinking structures.
2Device complexity
If solvent-less adhesive is used, then formulation simplicity is improved, but laminate integrity under thermal and chemical stress deteriorates
Solution Approach 1:
The patent modifies the chemical parameters of the adhesive by incorporating specific polyol components with defined molecular weights, hydroxyl numbers, and functional groups. The polyester-polycarbonate polyol provides backbone stability while the phosphate-terminated polyol introduces crosslinking capability, enabling the formulation to maintain laminate integrity under thermal and chemical stress without adding solvents or complex additives.
3Ease of operation
If conventional solvent-less adhesive is used, then application ease is improved, but resistance to delamination and bubbling deteriorates
Solution Approach 1:
The patent incorporates phosphate-terminated polyol components that pre-form crosslinking structures within the adhesive formulation before application. These pre-established crosslinking capabilities activate during curing to create a robust three-dimensional network that resists delamination and bubbling, while the adhesive maintains its original ease of application properties.
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 maintains strong adhesion after exposure to heat and chemicals, preventing defects like bubbling and delamination, and ensuring laminate integrity in applications requiring durability.
Implementation Method 1
The two-component solvent-less adhesive composition contains the reaction product of (A) an isocyanate component; and (B) a polyol component
Data Source
AI summary
The present disclosure provides a two-component solvent-less adhesive composition. The two-component solvent-less adhesive composition contains the reaction product of (A) an isocyanate component; and (B) a polyol component containing (i) a polyester-polycarbonate polyol and (ii) a phosphate-terminated polyol. The present disclosure also provides a method of forming the two-component solvent-less adhesive composition.