Liquid Electrostatic Ink Adhesion to Plastic Films
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Solution Overview
Problem
Many liquid electrostatic ink compositions do not adhere well to plastic substrates, requiring a primer for satisfactory adhesion, and face challenges in transferability from an intermediate transfer member to the substrate.
Innovation Solution
A liquid electrostatic ink composition comprising a carrier liquid, a first resin copolymerized from an alkylene monomer and methacrylic acid, and a second resin copolymerized from an alkylene monomer and acrylic acid, with the second resin constituting at least 35 wt.% of the total resin, allowing direct printing on plastic films without a primer and improving transferability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a primer is applied to plastic substrates, then adhesion of liquid electrostatic ink is improved, but device complexity and printing process steps increase
Solution Approach 1:
The patent extracts and eliminates the primer step from the printing process by incorporating adhesion-promoting functionality directly into the liquid electrostatic ink composition itself. The ink formulation includes specific resin components and surface treatment agents that provide sufficient adhesion to plastic substrates without requiring a separate primer application step.
Solution Approach 2:
The liquid electrostatic ink composition is designed to perform multiple functions simultaneously: it provides electrostatic charging, coloration, and adhesion promotion in a single formulation. This multi-functional ink eliminates the need for separate primer and ink application steps, reducing process complexity while maintaining strong adhesion to plastic substrates.
2Productivity
If conventional liquid electrostatic ink is used, then printing process is simple, but transferability from intermediate transfer member to substrate deteriorates
Solution Approach 1:
The patent modifies the chemical and physical parameters of the liquid electrostatic ink composition, specifically adjusting resin types, molecular weight distribution, and surface tension characteristics. These parameter changes enhance the ink's transferability from the intermediate transfer member to the substrate while maintaining image quality and reducing defects.
Solution Approach 2:
The ink formulation employs composite material science by combining multiple resin components with complementary properties. The composite resin system provides both the electrostatic charging capability and the adhesion/transfer properties needed for reliable printing on plastic substrates, ensuring high image quality and complete transfer.
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 satisfactory adhesion and transfer to plastic films without a primer, enhancing printing efficiency and quality on plastic substrates.
Implementation Method 1
The charged toner particles adhere to the image areas of the latent image while the background areas remain clean
Implementation Method 2
The image is then transferred to a print substrate (e.g. paper or plastic film) directly or, more commonly, by being first transferred to an intermediate transfer member
Data Source
AI summary
An electrostatic ink composition comprising a carrier liquid; a first resin comprising a copolymer of an alkylene monomer and a methacrylic acid monomer; and a second resin comprising a copolymer of an alkylene monomer and an acrylic acid monomer, wherein the second resin constitutes at least 35 wt. % of the total amount of resin is disclosed.