Siloxane Polymer Ink Composition for UV Curing Stability
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Solution Overview
Problem
Inkjet recording methods face challenges in achieving high ink ejection stability, rubfastness, and blocking resistance while maintaining compatibility between ink ejection stability and curing properties, particularly with ultraviolet ray-curable inks.
Innovation Solution
An ink composition comprising a polymer with a siloxane structure and a polymerizable group on a side chain, combined with a photopolymerization initiator, which enhances surface tension adjustment and crosslinking efficiency, resulting in improved rubfastness and blocking resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone derivatives are used to reduce surface tension for inkjet ejection stability, then ink ejection stability is improved, but rubfastness and blocking resistance become insufficient
Solution Approach 1:
The patent uses a composite ink composition containing both silicone derivative (surface tension reducer) and polyol compound (crosslinking agent). The silicone derivative ensures stable inkjet ejection by reducing surface tension, while the polyol compound provides rubfastness and blocking resistance through crosslinking reactions upon curing, creating a material composite that achieves both properties simultaneously
Solution Approach 2:
The patent changes the chemical composition parameters of the ink by specifying precise proportions of silicone derivative (0.1-10 wt%), polyol compound (5-50 wt%), and other components. By adjusting these compositional parameters, the ink achieves optimal balance between ejection stability (via surface tension control) and image strength (via crosslinking density)
2Reliability
If conventional inkjet inks are used to achieve ink ejection stability, then ejection is stable, but curing properties and image strength are insufficient
Solution Approach 1:
The patent creates a composite curing system combining photopolymerization initiators (for UV curing) and polyol compounds (for chemical crosslinking). This dual-curing mechanism ensures both stable inkjet ejection (through proper viscosity and surface tension control) and superior image strength (through extensive crosslinking network formation), resolving the contradiction between ejection stability and curing properties
3Ease of operation
If surface tension is reduced for better ink ejection, then ejection stability improves, but rubfastness deteriorates
Solution Approach 1:
The polyol compound acts as an intermediary that bridges the conflict between surface tension reduction and rubfastness. While silicone derivatives reduce surface tension for stable ejection, the polyol compound provides the crosslinking function that ensures rubfastness, mediating between the two opposing requirements and allowing both to coexist in the final cured image
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 enhanced ink ejection stability, rapid curing, and superior rubfastness and blocking resistance, balancing flexibility and curing properties effectively.
Implementation Method 1
an ink composition which contains: (a) a polymer having a siloxane structure and a polymerizable group on a side chain thereof; (b) a polymerizable compound; and (c) a photopolymerization initiator
Implementation Method 2
for the purpose of reducing the surface tension of an inkjet ink, inkjet inks using silicone derivatives
Implementation Method 3
by curing ink droplets by irradiating radiation immediately after or after a fixed time after the ink is ejected, the productivity of printing can be increased, and sharp images can be formed
Data Source
AI summary
The present invention provides an ink composition having excellent ink ejection stability and stretching property, curable with a high sensitivity by irradiation of radiation rays, and capable of forming an image excellent in rubfastness and blocking resistance, an inkjet recording method using the ink composition, and a printed article. The ink composition includes (a) a polymer having a siloxane structure and a polymerizable group on a side chain thereof, (b) a polymerizable compound, and (c) a photopolymerization initiator, and the inkjet recording method includes a step of ejecting the ink composition onto a recording medium to be recorded with an inkjet recording apparatus and a step of curing the ink composition by irradiating active radiation rays on the ejected ink composition.