Transfer Inkjet Recording Using Polysaccharide Aggregation Liquid
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Solution Overview
Problem
The transfer type inkjet recording method described in Japanese Patent Laid-Open No. 2003-246135 faces issues with poor transfer properties and insufficient scratch resistance, particularly when using uncoated paper with high surface roughness, due to insufficient ink aggregation and bleeding, especially under high printing duty and wet scratch conditions.
Innovation Solution
A transfer type inkjet recording method that uses an ink containing an anionic component with a polymer compound having a polysaccharide structure and an aggregation liquid with a polysaccharide salt, which forms a complex aggregation reaction to enhance transfer properties and scratch resistance, by applying the ink and aggregation liquid to an intermediate transfer member and transferring the image to a recording medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an aggregation liquid containing a cationic polymer is used to aggregate inks on the intermediate transfer member, then image performance and water resistance are improved, but transfer properties deteriorate and final images become distorted
Solution Approach 1:
The patent changes the molecular weight parameter of the cationic polymer from conventional ranges (10,000-1,000,000) to a specific higher range (100,000-10,000,000), and optimizes the aggregation liquid composition to contain 0.01-10% cationic polymer and 90-99% water. This parameter optimization enables sufficient ink aggregation even at high printing duties while maintaining good transfer properties and preventing image distortion.
Solution Approach 2:
The patent uses a composite aggregation liquid system combining cationic polymers (such as dicyandiamide resin or polyallylamine) with specific molecular weights in a controlled concentration range. This composite approach balances the aggregation force needed for high-duty printing with the transferability required for quality image transfer to the recording medium.
2Strength
If the molecular weight of cationic substances is increased to increase film strength, then water resistance is improved, but transfer properties worsen
Solution Approach 1:
The patent identifies and optimizes the molecular weight parameter of cationic polymers, specifying a range of 100,000-10,000,000 for achieving both sufficient film strength and good transfer properties. This parameter optimization resolves the contradiction between film strength and transferability.
3Quantity of substance
If a high printing duty is applied to form color inks, then image coverage is improved, but bleeding occurs due to insufficient aggregation force
Solution Approach 1:
The patent optimizes the concentration of cationic polymers in the aggregation liquid (0.01-10%) and their molecular weight (100,000-10,000,000) to provide sufficient aggregation force even when large amounts of ink are applied at high printing duties. This prevents color bleeding while maintaining high image coverage.
Solution Approach 2:
The aggregation liquid is applied to the intermediate transfer member before inkjet printing to pre-establish the aggregation environment. This preliminary action ensures that when high amounts of color inks are deposited, the cationic polymers are already positioned to aggregate the ink particles effectively, preventing bleeding.
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 method achieves good transfer properties and improved wet scratch resistance even at high printing duty, reducing bleeding and maintaining image integrity by forming a specific three-dimensional crosslinking structure through hydrogen bonds and ionic bonds, thereby enhancing the film's water resistance.
Implementation Method 1
an inkjet recording method, comprising: forming an intermediate image by applying ink containing an anionic component to an image formation surface of an intermediate transfer member to which an aggregation liquid containing an aggregation agent which aggregates the anionic component in the ink has been applied
Implementation Method 2
forming a specific three-dimensional crosslinking structure through hydrogen bonds and ionic bonds, thereby enhancing the film's water resistance
Data Source
AI summary
A transfer type inkjet recording method uses an aggregation liquid, in which the aggregation liquid contains a polymer compound having either one of a polysaccharide having an amino group or a polysaccharide salt having an amino group.