Water-Based Printing Ink Polyurethane Acrylate Binders
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Solution Overview
Problem
Existing water-based lamination printing inks face challenges in achieving a balance between ink resolubility, lamination bond strength, and blocking resistance, with higher bond strength often associated with poor blocking resistance and vice versa, and the need for organic solvent-free solutions.
Innovation Solution
A water-based printing ink comprising a polyurethane dispersion binder and a poly(meth)acrylate dispersion binder, specifically formulated with diisocyanate, diol, mono-hydroxy functional compounds, and polyol components, and prepared by aqueous emulsion polymerization, to optimize the balance of ink resolubility and lamination bond strength while maintaining acceptable blocking resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If higher lamination bond strength is achieved, then adhesion between film and ink is improved, but blocking resistance deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the binder by incorporating carboxylic acid groups (0.1-10 mmol/g) and hydroxyl groups (0.1-10 mmol/g) in specific amounts. This parameter adjustment allows the binder to achieve optimal balance between adhesion (bond strength) and blocking resistance, resolving the contradiction by fine-tuning the functional group content rather than simply increasing overall binder strength.
Solution Approach 2:
The invention uses a composite binder system combining polyurethane and poly(meth)acrylate components with specific functional groups. This composite approach allows synergistic effects where the polyurethane provides adhesion through carboxylic acid groups while the poly(meth)acrylate contributes to blocking resistance, achieving both requirements simultaneously.
2Reliability
If more polar components are added to improve ink resolubility, then re-dissolution of dried ink is enhanced, but lamination bond strength decreases
Solution Approach 1:
The invention adjusts the polarity parameters by controlling the content of carboxylic acid groups and hydroxyl groups within specific ranges (0.1-10 mmol/g each). This balanced parameter adjustment ensures sufficient polarity for resolubility while maintaining adequate bond strength, preventing the inverse relationship from occurring.
Solution Approach 2:
The invention applies local quality by differentiating the functions of different functional groups within the binder: carboxylic acid groups primarily provide resolubility and adhesion to substrates, while hydroxyl groups contribute to bond strength and compatibility. This localized functional assignment allows simultaneous optimization of both resolubility and bond strength.
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 ink achieves high compatibility with pigments, good blocking behavior, and strong lamination bond strength, even in multiple print layers, with improved resolubility and reduced risk of ink bleeding or delamination, all while being free of organic solvents.
Implementation Method 1
prepared by aqueous emulsion polymerization
Implementation Method 2
aqueous dispersed polyurethane binder and an aqueous dispersed poly(meth)acrylate binder
Data Source
AI summary
Provided herein is a printing ink comprising at least two binders, at least one pigment, an aqueous carrier, and optional additives, wherein one binder is a specific polyurethane dispersion binder and a further binder is a specific poly(meth)acrylate dispersion binder.