Emulsion Coloring Materials for Erasable Ink Jet Printing
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Solution Overview
Problem
Current erasable image formation materials, particularly those using emulsion resins, face challenges in color developing ability, coloring ability, and high coloring temperatures, making them unsuitable for ink jet and offset printing, and they often leave residual resin when erased.
Innovation Solution
An emulsion coloring material comprising a copolymer resin of styrene and/or styrene derivatives with acrylate and/or methacrylate, combined with a chromatic material and a color developer, which stabilizes the interaction between the chromatic material and the color developer, allowing for deep color formation and erasability by heat or solvent without residual resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional emulsion resins are used for erasable ink, then erasability is achieved, but color developing ability and coloring ability are insufficient
Solution Approach 1:
The patent changes the chemical parameters of the emulsion resin by specifying precise compositional ratios (styrene 30-70 parts, acrylate 30-70 parts) and molecular weight ranges (10,000-50,000), which optimizes both color developing ability and complete erasability without resin residue
Solution Approach 2:
The patent creates a composite emulsion system combining specific ratios of styrene and acrylate units with chromatic materials and color developers, achieving synergistic effects that improve color development while maintaining complete erasability
2Ease of operation
If high-molecular microparticles are used in emulsion ink, then erasability is achieved, but coloring ability deteriorates
Solution Approach 1:
The patent optimizes the particle size parameters of high-molecular microparticles to 0.1-10 μm and controls their concentration in the emulsion, which balances erasability with adequate coloring ability by ensuring sufficient chromatic material distribution
3Ease of operation
If conventional emulsion ink is used, then erasability is achieved, but coloring temperature becomes excessively high
Solution Approach 1:
The patent changes the chemical composition parameters of the emulsion resin and chromatic material interactions, which lowers the coloring temperature to 30-80°C range, making it suitable for ink jet printing while maintaining erasability
4Productivity
If erasable image formation material is used in ink jet printing, then resource efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent stabilizes the chemical parameters of the emulsion system including pH (4-9), solid content (1-20%), and component ratios, which ensures consistent image quality and color development across different printing conditions while maintaining resource efficiency
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 a high-color-developing, erasable image formation material suitable for ink jet and offset printing, maintaining color stability and decoloring ability at ambient temperatures, reducing energy consumption, and minimizing environmental impact.
Implementation Method 1
an emulsion comprising a copolymer resin of at least one unit selected from styrene and styrene derivatives and at least one unit selected from an acrylate and a methacrylate
Implementation Method 2
capable of erasing an image by heating or by contact with an organic solvent
Implementation Method 3
an increase in the interaction between a chromatic material (leuco dye) and a color developer puts the chromatic material into a color developed state whereas a decrease in the interaction puts the chromatic material into a decolored state
Data Source
AI summary
There is provided an emulsion coloring material which can be used on ordinary paper, has good color developability, and can be used for conventional erasable pens or printing inks of black or blue color, having sufficiently high densities. When use is made of an erasable emulsion coloring material capable of controlling color development and decolorization by the presence or absence of the interaction between a chromatic material and a color developer, the colored emulsion comprising a copolymer resin of at least one unit selected from styrene and styrene derivatives and at least one unit selected from an acrylic acid ester and a methacrylic acid ester having a substituent which comprises a carbon chain having 4 or more carbon atoms, coloring ability can be enhanced.