Imaging Blanket Topcoat Composition with Non-Reactive Dispersant
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Solution Overview
Problem
Current topcoat compositions for imaging blankets in variable data lithography suffer from variability in storage stability and processing due to reactive dispersants, leading to insufficient physical properties and unfavorable print quality performance.
Innovation Solution
A topcoat composition comprising fluorosilicone, a hydride-functional crosslinking agent, and a non-reactive dispersant, such as Zephrym® PD 2206, which maintains a degree of crosslinking between 10 micrograms/hour/milligrams to 20 micrograms/hour/milligrams, improving crosslinking performance and print quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If reactive dispersants are used in topcoat composition, then the incorporation and uniform dispersion of carbon black and other functional fillers is improved, but the storage stability and crosslinking performance become variable and insufficient
Solution Approach 1:
The patent removes reactive dispersants from the topcoat composition and replaces them with non-reactive alternatives. This extraction of the harmful reactive component eliminates the unwanted side reactions while maintaining the dispersant's primary function of uniform filler distribution, thereby resolving the contradiction between dispersion quality and crosslinking performance
Solution Approach 2:
The patent changes the chemical parameters of the dispersant from reactive to non-reactive, specifically selecting dispersants without functional groups that would interfere with the hydride-functional crosslinking agent. This parameter change maintains adequate dispersion while enabling consistent crosslinking performance and improved storage stability
2Ease of manufacture
If dispersants with chemical functional groups are used, then the rheological properties and coating process characteristics are improved, but unintended reactions with crosslinked polymer topcoat occur leading to variability in processing and print quality
Solution Approach 1:
The patent converts the potential harm of dispersant reactivity into a benefit by deliberately selecting non-reactive dispersants that contain no functional groups capable of reacting with the crosslinking agent. This selection criterion transforms what would be a harmful reactive property into a beneficial non-reactive property, ensuring consistent print quality while maintaining adequate coating process characteristics
Solution Approach 2:
The patent introduces non-reactive dispersants as intermediary substances that mediate between the fillers and the crosslinked polymer matrix without participating in the crosslinking reaction. These intermediary dispersants provide adequate rheological properties and coating characteristics while remaining chemically inert to the crosslinking process, thus preventing unintended reactions
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 optimized physical properties and consistent print quality by reducing coating defects and maintaining surface roughness, while enhancing the durability and performance of the imaging blanket.
Implementation Method 1
a hydride-functional crosslinking agent
Implementation Method 2
an infrared-absorbing filler, such as carbon black
Data Source
AI summary
Provided herein is a topcoat composition comprising at least one fluorosilicone, a hydride-functional crosslinking agent, an infrared-absorbing filler, and at least one dispersant that is non-reactive with the hydride-functional crosslinking agent, by weight based on a total weight of the topcoat composition, wherein the topcoat composition has a degree of crosslinking between about 10 micrograms/hour/milligrams to about 20 micrograms/hour/milligrams. Further provided herein are methods of making the topcoat composition, as well as an imaging blanket and methods of reducing coating defects on a media coated using the imaging member.