Polyurethane Laminate Adhesive Composition for Low Coefficient of Friction
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Solution Overview
Problem
Existing two-component solventless polyurethane-based laminating adhesives exhibit a significant increase in coefficient of friction (COF), which limits their commercialization, despite retaining other desirable properties like bond strength, heat seal strength, and boil-in-bag resistance.
Innovation Solution
A solventless polyurethane adhesive composition is formulated by reacting isocyanate components derived from diisocyanates, polyethylene glycols, and optional additional polyols to form a prepolymer with free isocyanate groups, combined with polyether or polyester polyols, to reduce COF while maintaining bond strength and heat seal strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two-component solventless polyurethane-based laminating adhesive is used, then bond strength, heat seal strength, and boil-in-bag resistance are maintained, but coefficient of friction significantly increases
Solution Approach 1:
The patent changes the chemical composition parameters of the polyol component by selecting specific polyols (polyester polyol with specific hydroxyl value and acid value ranges, or polyether polyol with specific hydroxyl value ranges) to modify the adhesive's COF while maintaining other performance properties. This parameter optimization resolves the contradiction between maintaining reliability and reducing harmful friction effects.
Solution Approach 2:
The patent uses composite material formulation by combining isocyanate component with specifically selected polyol components (polyester or polyether polyols) in controlled ratios. This composite approach allows the adhesive to simultaneously achieve low COF and maintain bond strength, heat seal strength, and boil-in-bag resistance through synergistic material interaction.
2Ease of manufacture
If conventional polyol components are used in solventless polyurethane adhesive, then adhesive formulation is simple, but coefficient of friction becomes high
Solution Approach 1:
The patent applies parameter changes by specifying precise ranges for polyol selection (hydroxyl value 50-200 mg KOH/g, acid value 0.1-5 mg KOH/g for polyester polyol; hydroxyl value 100-500 mg KOH/g for polyether polyol) to optimize COF while maintaining formulation simplicity. This structured parameter approach makes the complexity manageable and reproducible.
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 composition effectively reduces COF while preserving other performance properties, such as bond strength and heat seal strength, making it suitable for commercial applications.
Implementation Method 1
a polyol component comprising at least one polyether polyol, at least one polyester polyol, or a combination thereof
Data Source
AI summary
A method for reducing coefficient of friction of a laminate comprising a polyurethane adhesive is provided. The method comprises providing the polyurethane adhesive; and adhering at least two substrates with the polyurethane adhesive to form a laminate, wherein the polyurethane adhesive is formed by reacting (A) an isocyanate component comprising a prepolymer derived from the reaction of a diisocyanate, a polyethylene glycol and optionally an additional polyol; with (B) a polyol component. The method can achieve minimized COF and viscosity, while retaining other performance properties such as bond strength, heat seal strength and boil in bag resistance. A composition for preparing the adhesive, a laminate product prepared with said composition as well the method for preparing the laminate product are also provided.