Acrylamide Ink Composition for Skin-Safe Curability
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Solution Overview
Problem
Current photopolymerizable inkjet inks face challenges in balancing curability and viscosity, with many monomers being toxic and causing skin sensitization, and the use of organic solvents leading to environmental issues and instability in inkjet discharging.
Innovation Solution
A composition comprising an acrylamide compound with an ester structure and a polymerization initiator of molecular weight 800 or more, which is safe regarding skin sensitization and maintains excellent curability without using organic solvents, thereby reducing viscosity and improving inkjet discharging stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymerizable monomers such as acrylic acid esters are used to achieve curability, then curability is improved, but skin sensitization and toxicity worsen
Solution Approach 1:
The patent changes the chemical structure parameter of the polymerizable monomer from conventional acrylic acid esters to acrylamide compounds with specific ester groups. This structural parameter change maintains curability through the acrylamide group while eliminating skin sensitization by removing the problematic ester group configuration, thus resolving the contradiction between curability and safety
Solution Approach 2:
The patent creates a composite molecular structure combining the acrylamide group (providing curability) with specific ester groups (providing desired properties without sensitization). This composite approach integrates beneficial functions while eliminating harmful effects, resolving the contradiction between achieving curability and avoiding skin sensitization
2Stability of the object's composition
If organic solvents are added to adjust viscosity, then viscosity control is improved, but environmental friendliness and discharging stability worsen
Solution Approach 1:
The patent extracts and eliminates organic solvents from the ink composition entirely. By removing this harmful component, the invention achieves environmental friendliness while maintaining viscosity control through alternative means (composition formulation), thus resolving the contradiction between viscosity control and environmental safety
Solution Approach 2:
The patent replaces persistent organic solvents with a solvent-free or water-based formulation that does not require harmful additives. This substitution eliminates environmental contamination while achieving stable viscosity through careful composition design, resolving the contradiction between viscosity stability and environmental protection
3Speed
If small molecular weight polymerization initiators are used to achieve fast curing, then curing speed is improved, but curability and stability worsen
Solution Approach 1:
The patent changes the molecular weight parameter of the polymerization initiator from small (fast-acting but unstable) to large (800 or more). This parameter change provides both fast curing speed and excellent curability/stability, resolving the contradiction between curing speed and curability reliability
Solution Approach 2:
The patent selects specific large molecular weight initiators with particular functional groups that provide localized reactive sites for fast curing while the overall large molecular structure ensures stability and complete curability. This local quality approach resolves the contradiction between fast curing speed and reliable curability
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 practical curability and stability in inkjet discharging while being environmentally friendly and safe, with the acrylamide compound reducing skin sensitization risks and the polymerization initiator ensuring effective curing without organic solvents.
Implementation Method 1
an ink containing a polymerizable monomer such as an acrylic acid ester and a polymerization initiator that produces a radical upon irradiation with active energy rays is known as the radically polymerizable ink of active energy ray curable type
Data Source
AI summary
A composition contains an acrylamide compound A1 having an ester structure and a polymerization initiator B1 having a molecular weight of 800 or more.