Ink Set for Inkjet Recording with Polyamine and Anionic Resin
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Solution Overview
Problem
Inkjet recording apparatuses with lineheads struggle to achieve improved image density and are prone to ink offset due to limitations in ink properties, particularly in overprinting processes.
Innovation Solution
An ink set comprising a first ink with a black dye and a polyamine, and a second ink with a black pigment coated with an anionic resin, where the polyamine slowly aggregates with the anionic resin to precipitate the pigment, enhancing image density and reducing ink offset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a polyamine pre-treatment solution is used followed by pigment ink, then image density can be improved, but ink offset occurs and water resistance deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the ink formulation by incorporating specific polyamines (with defined molecular weights and structures) and anionic resins into the pigment ink itself, rather than using them as separate pre-treatment solutions. This parameter change allows the ink to achieve both high image density and water resistance simultaneously by controlling the aggregation behavior of pigment particles through the polyamine-anionic resin interaction.
Solution Approach 2:
The patent creates a composite ink system where pigment particles are combined with polyamines and anionic resins to form a unified ink composition. This composite structure allows the pigment particles to be properly aggregated and fixed on the recording medium, achieving both high density and water resistance without the harmful offset effects of separate pre-treatment approaches.
2Manufacturing precision
If a polyamine pre-treatment solution is used followed by pigment ink, then image density can be improved, but water resistance deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters by incorporating polyamines and anionic resins directly into the pigment ink formulation. This allows precise control over the aggregation and fixation of pigment particles, achieving both high image density and improved water resistance by optimizing the molecular weight, structure, and concentration of the polyamine components within the ink itself.
Solution Approach 2:
The patent develops a composite ink material where pigment particles are integrated with polyamine and anionic resin components. This composite structure ensures that the pigment particles are properly aggregated and bonded to the recording medium, simultaneously achieving high image density and enhanced water resistance without the compromising effects of separate pre-treatment solutions.
3Productivity
If linehead is used for high-speed printing, then productivity increases, but overprinting capability deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the ink to include polyamines with specific molecular weights (500-5000) and structures that enable rapid aggregation with anionic resins. This allows the ink to achieve proper pigment fixation in a single pass through the linehead, compensating for the limited overprinting capability of linehead systems while maintaining high printing speed.
Solution Approach 2:
The patent incorporates polyamines and anionic resins into the pigment ink formulation in advance, creating a pre-configured system that will automatically aggregate and fix pigment particles upon contact with the recording medium. This preliminary preparation eliminates the need for separate pre-treatment steps, enabling effective pigment fixation with high-speed linehead printing.
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 set effectively forms high-density images while minimizing ink offset, improving the fixability and water resistance of the ink on the recording medium.
Implementation Method 1
the polyamine slowly aggregates with the anionic resin to precipitate the pigment
Implementation Method 2
the polyamine slowly aggregates with the anionic resin to precipitate the pigment
Implementation Method 3
a black pigment having a coat of an anionic resin
Data Source
AI summary
An ink set for inkjet recording includes: a first ink containing a black dye and a polyamine; and a second ink containing a black pigment having a coat of an anionic resin. An inkjet recording method includes: ejecting a first ink containing a black dye and a polyamine onto a recording medium through an inkjet recording head; and ejecting a second ink containing a black pigment having a coat of an anionic resin onto the first ink ejected on the recording medium through an inkjet recording head.