Water-based Binder Composition for Flexible Packaging
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Solution Overview
Problem
Existing water-based ink binders fail to achieve a balanced performance in ink resolubility, drying speed, and lamination bond strength on various substrates, which is essential for flexible laminated packaging applications.
Innovation Solution
A water-based binder composition comprising a waterborne poly(meth)acrylate emulsion with specific molecular weight and acid value ranges, combined with a polyurethane made from diisocyanate, diol, mono-hydroxy functional compound, polytetrahydrofuran diol, diamino acid compound, and polyamine, optimized for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If water-based ink binder is used to replace solvent-based ink, then VOC emission is reduced, but ink resolubility, blocking resistance, drying speed and lamination bond strength become unbalanced
Solution Approach 1:
The patent uses a composite binder system combining waterborne poly(meth)acrylate emulsion and polyurethane dispersion in specific ratios (70:30 to 30:70). This composite approach allows the ink to achieve both environmental compliance (water-based) and performance requirements (resolubility, bond strength, drying speed) that single-component water-based binders cannot provide alone.
Solution Approach 2:
The patent optimizes specific parameters of the binder components: poly(meth)acrylate emulsion with Tg of -20°C to 0°C and polyurethane with specific molecular weight ranges. By controlling these parameters within defined ranges, the ink achieves balanced performance in resolubility, drying speed, and lamination bond strength while maintaining water-based formulation.
2Strength
If polyurethane dispersion binder is used, then lamination bond strength is improved, but ink resolubility and drying speed become compromised
Solution Approach 1:
The patent merges two different binder types (poly(meth)acrylate emulsion and polyurethane dispersion) into a single ink formulation. The poly(meth)acrylate component provides resolubility and drying speed, while the polyurethane component contributes lamination bond strength. Their synergistic combination resolves the trade-off between bond strength and other performance parameters.
Solution Approach 2:
The patent assigns different functional roles to different binder components: poly(meth)acrylate emulsion primarily provides resolubility and drying characteristics, while polyurethane dispersion primarily provides adhesion and bond strength. This functional differentiation allows each component to excel at its specific function without compromising overall performance.
3Reliability
If poly(meth)acrylate dispersion binder is used, then ink resolubility is improved, but lamination bond strength and blocking resistance deteriorate
Solution Approach 1:
The patent combines poly(meth)acrylate dispersion (providing resolubility) with polyurethane dispersion (providing bond strength) in a balanced ratio. This merging allows the ink to achieve both good resolubility from the acrylate component and sufficient lamination bond strength from the polyurethane component, resolving the contradiction between these two 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 binder composition provides enhanced ink resolubility, drying speed, and lamination bond strength, meeting the requirements for flexible laminated packaging applications while being free of volatile organic compounds.
Implementation Method 1
the binder composition provides enhanced ink resolubility, drying speed, and lamination bond strength
Implementation Method 2
drying speed
Data Source
AI summary
The present invention is related to a water-based binder composition and its application in water-based printing ink. The binder composition comprises a waterborne poly(meth)acrylate emulsion and a polyurethane. Such composition provides excellent alcohol tolerance, bond strength and resolubility.