Conductive Silicone Rubber Elastic Layer for Electrophotography
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Solution Overview
Problem
Silicone rubber elastic layers used in electrophotographic apparatuses experience an increase in electrical resistance over time due to prolonged current flow, leading to issues like ghosting in images.
Innovation Solution
An electro-conductive member with a silicone rubber elastic layer composed of an addition-curable silicone rubber mixture containing an organopolysiloxane, organohydrogenpolysiloxane, carbon black, and spherical solid inorganic particles, where the carbon black content is between 2.0% and 60.0% and the inorganic particle content is between 0.4% and 20.0% by mass, with specific particle diameter, specific gravity, and sphericity, inhibiting the movement of carbon black particles and thus reducing electrical resistance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon black is added to silicone rubber to provide conductivity, then electrical conductivity is improved, but electrical resistance increases over time due to power application
Solution Approach 1:
The patent combines carbon black particles with spherical inorganic particles (such as silica or glass beads) to create a composite conductive filler system. This composite approach allows the inorganic particles to act as spacers that prevent carbon black aggregation and maintain stable conductivity pathways, resolving the issue of resistance increase over time while preserving electrical conductivity
Solution Approach 2:
The patent optimizes the particle size distribution, shape, and surface properties of the inorganic particles to control the spatial arrangement of carbon black. By changing parameters such as inorganic particle diameter (0.1-10 μm), surface roughness, and surface treatment, the patent achieves stable carbon black dispersion and maintains consistent electrical resistance under prolonged power application
2Stability of the object's composition
If inorganic particles are added to inhibit carbon black movement, then electrical resistance stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the conductive filler system into distinct functional components: carbon black particles for conductivity and inorganic particles for structural stability. This segmentation allows each component to perform its specific function independently, simplifying the overall design while achieving resistance stability
Solution Approach 2:
The inorganic particles serve as intermediary elements between carbon black particles, acting as spacers that maintain optimal spacing and prevent direct carbon black aggregation. This intermediary role simplifies the carbon black network structure and ensures stable electrical pathways without requiring complex formulations
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 effectively stabilizes electrical resistance over time, preventing increases due to power application and improving image quality by reducing ghosting and ensuring consistent conductivity.
Implementation Method 1
a silicone rubber elastic layer with electrical resistance that is less likely to vary even when a current flows therethrough over prolonged periods of time
Implementation Method 2
the inorganic particle content is between 0.4% and 20.0% by mass, with specific particle diameter, specific gravity, and sphericity, inhibiting the movement of carbon black particles
Data Source
AI summary
There is an electro-conductive member (4) for electrophotography. The electro-conductive member for electrophotography includes, in sequence, an electro-conductive base (1), an electro-conductive elastic layer (2), and a resin layer (3). The elastic layer (3) contains a cured product of an addition-curable silicone rubber mixture having a specific composition. The addition-curable silicone rubber mixture contains an organopolysiloxane that contains an alkenyl group attached to a silicon atom in its molecule, an organopolysiloxane that contains a hydrogen atom attached to a silicon atom in its molecule, carbon black, and spherical solid inorganic particles.