Electrophotographic Photosensitive Member Coating with Siloxane Resin
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Solution Overview
Problem
The use of halogenated solvents in electrophotographic photosensitive members for reducing contact stress between the photosensitive member and cleaning blades is environmentally regulated, leading to a need for nonhalogenated solvents like toluene and xylene, which do not sufficiently reduce the initial friction coefficient.
Innovation Solution
A method involving a surface-layer coating solution with a polycarbonate or polyester resin having a dimethylpolysiloxane structure, combined with toluene or xylene, and a compound with a higher boiling point than the solvent, to enhance the migration of the resin to the surface and reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If halogenated solvents are used in the surface-layer coating solution, then the initial friction coefficient is reduced and contact stress with cleaning blades is minimized, but environmental regulations and chemical management become more difficult
Solution Approach 1:
The patent changes the chemical composition parameters of the coating solution by incorporating siloxane-modified resin and specifically controlling the solvent mixture ratio (aromatic hydrocarbon 10-40 parts, ether 50-85 parts). This parameter adjustment allows the use of non-halogenated solvents while maintaining low friction properties, thus resolving the contradiction between environmental safety and friction reduction.
Solution Approach 2:
The patent uses a composite binder resin system combining siloxane-modified resin (3-20 parts) with conventional resin (70-95 parts), creating a composite material that exhibits both low friction characteristics and environmental compatibility. The siloxane modification introduces low-friction properties without requiring halogenated solvents, resolving the contradiction between performance and environmental impact.
2Object-affected harmful factors
If nonhalogenated solvents like toluene and xylene are used, then environmental regulations are satisfied, but the initial friction coefficient is not sufficiently reduced
Solution Approach 1:
The patent creates a composite binder resin system combining siloxane-modified resin with conventional resin, where the siloxane component provides low-friction properties. This composite approach enables the use of non-halogenated solvents while achieving sufficient friction reduction, resolving the contradiction between environmental compliance and friction performance.
Solution Approach 2:
The patent optimizes the solvent system by using ether solvents (50-85 parts) combined with aromatic hydrocarbons (10-40 parts), and adjusts the resin composition parameters (siloxane-modified resin 3-20 parts). These parameter changes enable non-halogenated solvents to achieve adequate friction reduction, resolving the contradiction between environmental safety and friction performance.
3Force
If siloxane-modified resin is incorporated into the surface layer, then the friction coefficient is reduced, but the coating solution stability and coating quality may be compromised
Solution Approach 1:
The patent optimizes the concentration of siloxane-modified resin within a specific range (3-20 parts) and adjusts the solvent composition (ether 50-85 parts, aromatic hydrocarbon 10-40 parts). These controlled parameter changes ensure that the siloxane-modified resin provides friction reduction without compromising coating solution stability or producing defects like whitening and drips, thus resolving the contradiction between friction reduction and coating quality.
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 method effectively reduces the initial friction coefficient on the electrophotographic photosensitive member's surface, improving the contact stress between the photosensitive member and cleaning blades while maintaining solution stability.
Implementation Method 1
forming a surface layer by evaporating a mixture of solvents A, B and C from a solution further comprising a polymer
Implementation Method 2
enhance the migration of the resin to the surface and reduce friction
Data Source
Figure 1
AI summary
The present invention provides a method for producing an electrophotographic photosensitive member, wherein a surface-layer coating solution includes (a) a polycarbonate or polyester resin not having a siloxane moiety at the end, (ß) a polycarbonate or polyester or acrylate resin having a siloxane moiety at the end,(?) toluene or xylene as a solvent, and (d) a compound, for example, a methyl benzoate, an ethyl benzoate, a benzyl acetate, ethyl 3-ethoxypropionate or a diethylene glycol ethyl methyl ether.