Polyrotaxane-Bonded Charge Transporter for Photosensitive Layer
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Solution Overview
Problem
Electrophotographic photosensitive members with polyrotaxane in surface layers have insufficient sensitivity and abrasion resistance, especially in low temperature and low humidity environments, due to charge transporting substance aggregation and low polymerization density.
Innovation Solution
Incorporating a charge transporting substance bonded to polyrotaxane in the surface layer to improve uniformity and polymerization density, preventing aggregation and enhancing charge transport ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyrotaxane is incorporated in the surface layer to improve abrasion resistance, then abrasion resistance is improved, but sensitivity becomes insufficient
Solution Approach 1:
The patent uses a composite material system consisting of polyrotaxane and charge transporting substance within the surface layer. This composite structure allows the polyrotaxane to provide mechanical durability while the charge transporting substance ensures adequate sensitivity, resolving the contradiction between abrasion resistance and sensitivity by combining materials with complementary functions.
2Duration of action of stationary object
If polyrotaxane is incorporated in the surface layer to improve mechanical durability, then mechanical durability is improved, but abrasion resistance becomes insufficient in repeated use in low temperature and low humidity environment
Solution Approach 1:
The patent modifies the chemical and physical parameters of the surface layer by incorporating charge transporting substance alongside polyrotaxane. This parameter change enhances the surface layer's properties to maintain abrasion resistance even under repeated use in low temperature and low humidity environments, where conventional polyrotaxane-based layers would deteriorate.
3Reliability
If charge transporting substance is added to improve sensitivity, then sensitivity is improved, but charge transporting substance aggregation occurs
Solution Approach 1:
The patent uses polyrotaxane as an intermediary substance that interacts with the charge transporting substance. This intermediary role of polyrotaxane prevents direct aggregation of charge transporting substance molecules while still allowing them to function, thereby maintaining uniform distribution and composition stability while achieving improved sensitivity.
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 results in an electrophotographic photosensitive member with high sensitivity and excellent abrasion resistance, even in repeated use under low temperature and low humidity conditions.
Implementation Method 1
a surface layer comprising a polymerization product of a composition containing polyrotaxane and a charge transporting substance, and the polymerization product includes a bond between the polyrotaxane and the charge transporting substance
Data Source
AI summary
An electrophotographic photosensitive member having a support and a photosensitive layer on the support, wherein the electrophotographic photosensitive member comprises a surface layer comprising a polymerization product of a composition containing polyrotaxane and a charge transporting substance, and the polymerization product including a bond between the polyrotaxane and the charge transporting substance.