Aqueous UV Ink Composition with Low Mw/F Ratio
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Solution Overview
Problem
Aqueous ultraviolet curable inks with polymerizable compounds having long-chain water-soluble groups often result in reduced curing sensitivity and blocking resistance due to increased molecular weight, affecting image quality.
Innovation Solution
An aqueous ink composition containing a water-soluble polymerizable compound with two or more (meth)acrylamide groups, a polymerization initiator, and water, where the molecular weight to functional group ratio is 175 or less, and without specific partial structures, enhancing curing sensitivity and blocking resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a polymerizable compound with a long-chain water-soluble group is used, then water solubility is improved, but curing sensitivity deteriorates due to increased molecular weight
Solution Approach 1:
The patent applies parameter changes by strictly controlling the molecular weight to functional group ratio (Mw/F) to be 175 or less. This quantitative parameter control ensures that the polymerizable compound maintains both adequate water solubility and high curing sensitivity, resolving the contradiction between solubility and curing performance.
Solution Approach 2:
The patent uses composite materials by combining the polymerizable compound with a polymerization initiator and water in specific proportions. This composite formulation achieves optimal water solubility and curing sensitivity that cannot be obtained by the polymerizable compound alone.
2Stability of the object's composition
If the molecular weight of the polymerizable compound is increased, then water solubility is improved, but blocking resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the molecular weight to functional group ratio (Mw/F) to be 175 or less. This parameter control ensures that the cured film achieves both adequate water solubility and high blocking resistance, resolving the contradiction between solubility and film strength.
3Stability of the object's composition
If the molecular weight of the polymerizable compound is increased, then water solubility is improved, but image quality deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the molecular weight to functional group ratio (Mw/F) to be 175 or less. This precise parameter control ensures that the ink composition achieves both adequate water solubility and high image quality, resolving the contradiction between solubility and printing precision.
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 composition achieves excellent curing sensitivity and blocking resistance, allowing for high-quality image formation with improved film physical properties.
Implementation Method 1
an ultraviolet curable aqueous ink has been known for a long time... when the ink composition is applied onto a recording medium and then the ink composition is irradiated with an active energy ray, for example, the ink composition is cured
Data Source
AI summary
An aqueous ink composition including: a water-soluble polymerizable compound containing two or more polymerizable functional groups each selected from the group consisting of a (meth)acrylamide group, a maleimide group, a vinyl sulfone group, and an N-vinyl amide group, wherein a ratio of a molecular weight of the compound relative to a number of the polymerizable functional groups contained in a single molecule of the compound is 175 or less; a polymerization initiator; and water.