Inkjet Ink Composition for Adhesion and Blocking Resistance
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Solution Overview
Problem
Inkjet inks face challenges in achieving a balance between adhesion, blocking resistance, and low embrittlement, particularly when formulated without water or volatile organic solvents, as monofunctional (meth)acrylate-based inks offer excellent adhesion but poor resistance, while adding difunctional or multifunctional monomers improves resistance at the cost of adhesion.
Innovation Solution
An inkjet ink composition comprising N-vinyl amide and/or N-acryloyl amine monomers, at least two cyclic monofunctional (meth)acrylate monomers, a difunctional (meth)acrylate monomer, a radical photoinitiator, and a colorant, specifically using PEA and C8-12 alkane diol di(meth)acrylate, which provides the necessary balance of properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If difunctional or multifunctional (meth)acrylate monomers are added to improve blocking resistance, then blocking resistance is improved, but adhesion is reduced
Solution Approach 1:
The patent changes the chemical parameters by selecting a specific difunctional monomer (C8-12 alkane diol di(meth)acrylate) with controlled molecular weight and structure, and adjusting its concentration in the formulation to achieve optimal balance between crosslinking density and adhesion
Solution Approach 2:
The patent creates a composite monomer system combining at least two different cyclic monofunctional (meth)acrylate monomers with a difunctional (meth)acrylate monomer, where each component contributes different properties to achieve synergistic effects in adhesion, blocking resistance, and embrittlement prevention
2Strength
If monofunctional (meth)acrylate monomers are used to achieve excellent adhesion, then adhesion is improved, but blocking resistance is poor
Solution Approach 1:
The patent merges monofunctional and difunctional (meth)acrylate monomers in a specific ratio, combining the adhesion benefits of monofunctional monomers with the blocking resistance benefits of difunctional monomers through controlled crosslinking
Solution Approach 2:
The patent adjusts the functionality ratio and molecular weight parameters of the monomer mixture to optimize the balance between adhesion and blocking resistance, using C8-12 alkane diol di(meth)acrylate with specific chain length
3Strength
If (meth)acrylate monomers are used to achieve low shrinkage and good adhesion, then adhesion is improved, but embrittlement of substrate occurs
Solution Approach 1:
The patent changes the molecular weight and chain flexibility parameters by using C8-12 alkane diol di(meth)acrylate with specific chain length, providing enough flexibility to prevent embrittlement while maintaining crosslinking for adhesion
Solution Approach 2:
The patent creates different local properties in the cured film by using a mixture of rigid and flexible monomers, where the C8-12 alkane chain provides local flexibility to prevent embrittlement while the acrylate groups provide crosslinking for adhesion
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 specific blend of components in the inkjet ink achieves excellent adhesion, blocking resistance, and low embrittlement, maintaining high-quality image formation without compromising jetting properties or requiring water or volatile organic solvents.
Implementation Method 1
Inks which cure by the polymerisation of monomers
Data Source
AI summary
The present invention provides an inkjet ink comprising: 6-35% by weight of NVC; 5-60% by weight of PEA; 15-35% by weight of a C8.12 alkane diol di(meth)acrylate; a radical photoinitiator; and a colorant, wherein the percentages by weight are based on the total weight of the ink. The present invention further provides an inkjet ink set wherein at least one of the inks in the set, preferably all of the inks in the set, is an inkjet ink as defined above. Furthermore, the present invention provides a method of inkjet printing comprising inkjet printing the inkjet ink or inkjet ink set as defined above onto a substrate and curing the ink.