Acrylamide Ink Composition for UV-LED Curing
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Solution Overview
Problem
Radical polymerizable inks with large molecular weight monomers exhibit poor curability and strength when cured with active energy rays, particularly when using ultraviolet light-emitting diodes with a peak wavelength of 395 nm, and often have unpleasant odors.
Innovation Solution
A composition comprising an acrylamide compound with a molecular weight of 150-200, an acylphosphine oxide polymerization initiator, and additional polymerization initiators such as α-aminoketone, α-hydroxyketone, oxime ester, thioxanthone, benzophenone, or acridone, which provides improved curability and reduced odor upon active energy ray irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a monomer with large molecular weight is used to suppress odor, then odor is reduced, but curability upon active energy ray irradiation becomes poor
Solution Approach 1:
The patent optimizes the molecular weight parameter of the polymerizable monomer to a specific range (150-200) to simultaneously achieve odor suppression and maintain excellent curability. This parameter optimization resolves the contradiction by finding the optimal balance point where the molecular weight is sufficiently large to reduce odor but not so large as to impair curability upon active energy ray irradiation.
2Object-generated harmful factors
If a monomer with large molecular weight is used, then odor is suppressed, but strength of the cured product becomes poor
Solution Approach 1:
The patent specifies a precise molecular weight range (150-200) for the polymerizable monomer to achieve both odor suppression and excellent cured product strength. This parameter control ensures that the monomer is large enough to reduce odor but not excessively large, thereby maintaining strong intermolecular forces and excellent mechanical properties in the cured product.
3Use of energy by moving object
If ultraviolet light-emitting diode with peak wavelength of 395 nm is used for irradiation, then energy efficiency is improved, but both curability and strength of cured product become poor
Solution Approach 1:
The patent optimizes multiple parameters including the molecular weight of the polymerizable monomer (150-200) and the content ratio of polymerization initiators to achieve excellent curability with UV-LED irradiation at 395 nm. The optimized composition enables effective polymerization and strong cured product formation while maintaining the energy efficiency benefits of UV-LED technology.
Solution Approach 2:
The patent employs a composite formulation containing specific components: a polymerizable monomer with optimized molecular weight (150-200), an acylphosphine oxide polymerization initiator, and at least one additional polymerization initiator from specified groups. This composite material approach ensures excellent curability and strength when cured with UV-LED irradiation, resolving the contradiction between energy efficiency and curing performance.
4Use of energy by moving object
If ultraviolet light-emitting diode with peak wavelength of 395 nm is used for irradiation, then energy efficiency is improved, but strength of cured product becomes poor
Solution Approach 1:
The patent optimizes the molecular weight parameter of the polymerizable monomer to the range of 150-200 and controls the polymerization initiator content ratio to achieve both energy efficiency with UV-LED irradiation and excellent cured product strength. This parameter optimization ensures that the cured product attains high strength while benefiting from the energy-efficient 395 nm UV-LED irradiation process.
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 composition achieves excellent curability and strength in the cured product while minimizing odor, suitable for inkjet recording and other applications, with the acrylamide compound having a neutral ester structure and proper polarity for effective polymerization.
Implementation Method 1
an ink comprising a polymerizable monomer, such as an acrylic acid ester, and a polymerization initiator that generates radicals upon irradiation with an active energy ray
Implementation Method 2
a polymerization initiator that generates radicals upon irradiation with an active energy ray
Data Source
Figure 1~2
Figure 3A~3D
AI summary
A composition comprising an acrylamide compound (Al) having an ester structure and a molecular weight of from 150 to 200 and an acylphosphine oxide polymerization initiator (B1) is provided.