Radiation Curable Polyurethane Resin for Ink Jet Inks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Aqueous inkjet inks and treatment liquids face challenges in combining improved jetting performance, storage stability, and physical properties such as solvent resistance, with existing radiation-curable polyurethane resins not adequately addressing these requirements.
Innovation Solution
Incorporating a radiation curable polyurethane resin with an ionic group, polyalkylene oxide in the polyester urethane backbone, and (meth)acrylate or (meth)acrylamide components, which increases water dispersibility and curability via ultraviolet light, while using a specific composition of polyester polyol, polyether diol, and polyisocyanate to enhance adhesion and solvent resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If aqueous latex inkjet inks are used to reduce environmental impact and improve jetting performance, then environmental friendliness and jetting performance are improved, but substrate compatibility, adhesion, solvent resistance, and wear resistance deteriorate
Solution Approach 1:
The invention uses a composite binder system combining acrylic polymer particles with epoxy-functionalized silane crosslinking agents. The acrylic polymer provides water solubility and jetting performance, while the silane crosslinking agent forms a three-dimensional crosslinked network that enhances adhesion, solvent resistance, and wear resistance. This composite approach allows the ink to exhibit both environmental friendliness and superior physical properties.
2Reliability
If UV curable monomers are used to achieve curable image layers, then curability is improved, but viscosity increases and skin irritation occurs
Solution Approach 1:
The invention changes the molecular weight and functionality parameters of the curable components. Instead of using low molecular weight monomers that cause skin irritation, the invention uses acrylic polymer particles with higher molecular weight and epoxy-functionalized silane crosslinking agents. These modified parameters reduce skin irritation while maintaining curability through UV irradiation or moisture curing mechanisms.
3Strength
If resin content is increased to improve adhesion and solvent resistance, then physical properties are improved, but storage stability deteriorates
Solution Approach 1:
The invention incorporates epoxy-functionalized silane crosslinking agents within the acrylic polymer particles during manufacturing, preparing them for subsequent crosslinking. This preliminary action allows the resin to remain stable in aqueous dispersion during storage, while the pre-positioned crosslinking agents enable enhanced adhesion and solvent resistance to be activated upon curing after application, thus maintaining both storage stability and physical properties.
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 solution provides improved jetting performance, storage stability, and enhanced physical properties like scratch and solvent resistance, allowing for better compatibility with various substrates and reduced environmental impact.
Implementation Method 1
a (meth)acrylate or (meth)acrylamide having at least one hydroxyl functional group
Data Source
AI summary
A radiation curable polyurethane resin includes an ionic group, a polyalkylene oxide in a side chain thereof, and a (meth)acrylate or (meth)acrylamide having a hydroxyl functional group. The polyurethane resin is obtainable by reacting a polyester polyol, a polyether diol, a polyol containing an ionic group, a (meth)acrylate or (meth)acrylamide having a hydroxyl functional group, and a polyisocyanate. The polyester polyol is obtained by reacting a polycarboxylic acid and a polyol. The radiation curable polyurethane resin can be used as binder in an aqueous ink jet ink.