UV-Curable Ink Jet Ink for Lamination Strength and Blocking Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ink jet inks struggle to balance lamination strength and blocking resistance when used to create laminates with polyvinyl chloride-based materials, often sacrificing one property for the other.
Innovation Solution
Ink jet ink formulation containing a polymerizable monomer with a glass transition temperature (Tg) of 0°C to 50°C, combined with an α-aminoketone-type photopolymerization initiator of 600 or more, and optionally an acylphosphine oxide-type photopolymerization initiator, to enhance both lamination strength and blocking resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the lamination strength between the image and the base material is improved, then the blocking resistance of the image tends to be lowered
Solution Approach 1:
The patent applies parameter changes by precisely controlling the glass transition temperature (Tg) of the polymerizable monomer within 0°C to 50°C and selecting photopolymerization initiators with specific molecular weights (600 or more). This optimization of physical parameters enables the ink film to achieve both strong lamination adhesion and sufficient blocking resistance by tuning the molecular mobility and curing characteristics of the polymer network.
Solution Approach 2:
The patent employs composite materials by formulating an ink composition that combines multiple polymerizable monomers with different Tg values, along with specific photopolymerization initiators. This creates a composite polymer system where the synergistic interaction between components of different glass transition temperatures provides both strong bonding capability for lamination and appropriate rigidity for blocking resistance.
2Reliability
If the blocking resistance of the image is improved, then the lamination strength of the image tends to be lowered
Solution Approach 1:
The patent resolves this contradiction by changing the parameter of glass transition temperature to a specific range (0°C to 50°C) that balances two opposing requirements: lower Tg components provide flexibility and bonding ability for lamination, while higher Tg components within the range provide rigidity and blocking resistance. This precise parameter control allows simultaneous achievement of both properties.
Solution Approach 2:
The patent applies local quality by creating a polymer network with spatially varying properties through the use of multiple monomers with different Tg values. The cured ink film contains regions with different molecular mobility characteristics, where some regions provide strong adhesion to the base material while other regions maintain rigidity for blocking resistance, thus resolving the contradiction locally within the film structure.
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 formulation achieves images with improved lamination strength and blocking resistance, balancing the need for strong adhesion and resistance to sticking, by optimizing the glass transition temperature and using specific photopolymerization initiators.
Implementation Method 1
an ink jet ink comprising: a polymerizable monomer; and an α-aminoketone-type photopolymerization initiator having a molecular weight of 600 or more
Data Source
AI summary
The ink jet ink that contains a polymerizable monomer and an α-aminoketone-type photopolymerization initiator having a molecular weight of 600 or more, in which a weighted average value of a glass transition temperature of a homopolymer of the polymerizable monomer is 0°C to 50°C, and applications thereof are provided.