Glycidyl Polymer Fuser Release Layer
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Solution Overview
Problem
Toner fuser members in electrostatographic imaging systems face issues with toner adhesion, surface degradation, and poor mechanical properties, leading to false images and uneven thermal fixes due to insufficient resistance to heat, wear, and solvents.
Innovation Solution
A toner fuser member with a release surface layer composed of a cross-linked glycidyl end-capped bisphenolic polymer and a perfluoroalkylsubstituted glycidyl-reactive compound, providing excellent adhesion, durability, and low friction, eliminating the need for release oils and improving gloss and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fluorocarbon polymers or silicone polymers are used for fuser roll covering layers, then release properties are improved, but resistance to release oils and cleaning solvents deteriorates
Solution Approach 1:
The patent uses a composite material consisting of a fluorocarbon polymer matrix combined with a perfluoroalkyl-substituted silane crosslinking agent. This creates a crosslinked network structure that integrates the low surface energy properties of fluorocarbon polymers with the chemical stability and solvent resistance of crosslinked silicone-based structures, achieving both release properties and resistance to degradation.
Solution Approach 2:
The patent modifies the chemical structure by introducing crosslinks through perfluoroalkyl-substituted silane compounds. This changes the physical and chemical parameters of the polymer matrix, transforming it from a linear structure susceptible to solvent attack into a crosslinked network that resists swelling and degradation while maintaining surface release properties.
2Ease of operation
If silicone rubber covering layers are used, then release properties are improved, but durability under repeated heating and cooling cycles deteriorates
Solution Approach 1:
The patent creates a composite structure where fluorocarbon polymers provide release properties and crosslinked silicone-based structures provide thermal stability. The crosslinked network formed by perfluoroalkyl-substituted silane compounds creates a more rigid and thermally stable framework that prevents delamination during thermal cycling.
Solution Approach 2:
The patent applies different functional properties to different aspects of the material: the fluorocarbon polymer chains provide low surface energy for release properties, while the crosslinked silane network provides structural integrity and thermal stability. This local differentiation of material properties allows simultaneous achievement of release characteristics and thermal durability.
3Ease of operation
If release oils are applied to prevent toner adhesion, then toner release is improved, but swelling, softening, and degradation of the roll occur
Solution Approach 1:
The patent eliminates the need for release oils by incorporating release properties directly into the fuser roll covering layer material. The crosslinked fluorocarbon-silane composite provides inherent low surface energy that prevents toner adhesion without requiring external oil applications, thereby removing the source of swelling and degradation.
Solution Approach 2:
The fuser roll covering layer is designed to be self-sufficient by integrating release properties into its bulk structure through crosslinking. The material serves its own release function without requiring external agents, and the crosslinked structure provides inherent resistance to the chemical attacks that would otherwise cause degradation.
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 achieves high gloss, durability, and effective toner release without oils, significantly enhancing the fuser member's resistance to wear and solvents, resulting in improved image quality and extended service life.
Implementation Method 1
about 95 wt. % to about 99.9 wt. % of a cross-linked, glycidyl end-capped bisphenolic polymer and about 0.01 wt. % to about 5 wt. % of a perfluoroalkylsubstituted glycidyl-reactive compound
Implementation Method 2
form a hard, tough surface that is resistant to wear and cracking as well as to cleaning solvents and fluids
Data Source
AI summary
A toner fuser member has a substrate, on which is formed a toner release surface layer from a composition that includes: about 95 wt. % to about 99.9 wt. % of a cross-linked, glycidyl end-capped bisphenolic polymer having the formulawhere R1 and R2 are each independently H or an alkyl group containing 1 to about 4 carbon atoms, and R3 and R4 are each independently H, F, or an alkyl group containing 1 to about 4 carbon atoms, Z is a carbonyl cross-linking group, and x is an integer from 1 to about 10; and about 0.01 wt. % to about 5 wt. % of a perfluoroalkylsubstituted glycidyl-reactive compound having the formulawhere R5 is H or F, Q is OH or SiR6R7R8, R6, R7, and R8 being independently selected from the group consisting of Cl, OH, an alkyl group containing 1 to about 4 carbon atoms, an alkoxy group containing 1 to about 4 carbon atoms, an acyloxy group containing 2 to about 4 carbon atoms, and an amino group containing 0 to about 4 carbon atoms; and n is an integer from 1 to about 15. When Q is SiR6R7R8, at least one of R6, R7, and R8 is Cl, OH, or an alkoxy, acyloxy, or amino group.