Polymerizable Ink Jet Ink Balancing Lamination and Blocking Resistance
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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
An ink jet ink formulation containing a polymerizable monomer with a weighted average glass transition temperature of 0° C. to 50° C., combined with an α-aminoketone-type photopolymerization initiator having a molecular weight 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 carefully controlling the glass transition temperature (Tg) of the polymerizable monomer within a specific range (0°C to 50°C) and adjusting the molecular weight of the photopolymerization initiator to 600 or more. These parameter optimizations enable the ink to achieve both strong lamination adhesion and sufficient blocking resistance by balancing the polymer's flexibility and stability.
Solution Approach 2:
The patent uses composite materials by combining specific polymerizable monomers with controlled Tg values and photopolymerization initiators with molecular weights of 600 or more. This composite formulation creates a cured ink film that simultaneously provides strong bonding to polyvinyl chloride base materials while maintaining resistance to blocking, resolving the trade-off between lamination strength and blocking resistance.
2Object-affected harmful factors
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 parameters of the photopolymerization initiator, specifically selecting initiators with molecular weights of 600 or more. This parameter change allows the system to achieve high blocking resistance while maintaining adequate lamination strength, as the higher molecular weight initiator provides better stability and reduced blocking tendency without significantly compromising adhesion.
Solution Approach 2:
The patent optimizes the Tg of the polymerizable monomer within the range of 0°C to 50°C, which balances the film's flexibility (for blocking resistance) and bonding capability (for lamination strength). This parameter optimization ensures that the cured film resists blocking while maintaining sufficient adhesive strength to the base material.
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 improved lamination strength and blocking resistance in laminates by optimizing the glass transition temperature and using specific photopolymerization initiators, ensuring effective adhesion and resistance to sticking.
Implementation Method 1
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.