Primer Composition Surfactant Optimization for Inkjet Printability
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Solution Overview
Problem
Inkjet printing on aqueous inkjet ink compositions often results in conspicuous streaks and deteriorated image quality due to insufficient dot spreading on the primer layer, especially when printing solid images, and existing primer compositions lack transparency and storage stability, especially on transparent substrates.
Innovation Solution
A primer composition containing a resin emulsion, an aggregation accelerator, and a combination of acetylene-based and nonionic surfactants with specific HLB values and polyoxyalkylene groups, which improves leveling properties, printability, and bleeding resistance, while maintaining storage stability and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional primer compositions are used, then storage stability is achieved, but printability and dot spreading on the primer layer deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the surfactant system by specifying a nonionic surfactant with HLB value of 3 or more and less than 6, and requires the surfactant content to be 0.01 wt% or more and less than 5 wt%. This parameter optimization resolves the contradiction by achieving both storage stability and improved dot spreading/printability on the primer layer.
2Reliability
If conventional primer compositions are used, then bleeding resistance is achieved, but transparency of the primer layer deteriorates
Solution Approach 1:
The patent optimizes the surfactant concentration parameter to 0.01 wt% or more and less than 5 wt%, and specifies the HLB value range of 3 or more and less than 6. This parameter control allows the primer layer to maintain high transparency on transparent substrates while preserving bleeding resistance when aqueous inkjet ink composition is applied.
3Manufacturing precision
If surfactant amount is increased to improve leveling property, then printability improves, but storage stability deteriorates
Solution Approach 1:
The patent precisely defines the surfactant content parameter as 0.01 wt% or more and less than 5 wt%, and the HLB value as 3 or more and less than 6. This optimized parameter range achieves excellent leveling property and printability while maintaining storage stability, avoiding the deterioration that occurs with excessive surfactant amounts.
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 primer composition enhances printability and bleeding resistance of solid images, achieves high transparency, and maintains excellent storage stability, effectively addressing the issues of streaks and image quality in inkjet printing on transparent substrates.
Implementation Method 1
the surfactant contains one or more surfactants (A) selected from the group consisting of an acetylene-based surfactant and a silicone-based surfactant and a nonionic surfactant (B) other than the surfactant (A), the nonionic surfactant (B) has an HLB value of 10 or more and less than 15.5 and a plurality of polyoxyalkylene groups in the molecule
Implementation Method 2
a primer composition containing an aggregation accelerator that accelerates aggregation of the aqueous inkjet ink composition
Data Source
AI summary
A primer composition including a resin emulsion, an aggregation accelerator, a surfactant, and water, the surfactant containing one or more of acetylene-based surfactants and silicone-based surfactants, and a nonionic surfactant other than the surfactant, the nonionic surfactant having an HLB value of 10 or above and below 15.5 and having multiple polyoxyalkylene groups, and the proportion of the nonionic surfactant in the primer composition is 3 mass % or below. The primer composition has excellent storage stability and makes it possible to form a primer layer that has excellent transparency and that produces excellent bleeding resistance and printability when a solid image is printed by an aqueous inkjet ink composition.