Liquid Developer Toner Dispersibility and Resistivity
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Solution Overview
Problem
The addition of lecithin to liquid developers leads to a decline in volume resistivity, causing image blurring and deteriorated developing performance, while also inhibiting ultraviolet-induced curing reactions and failing to prevent toner particle aggregation.
Innovation Solution
A liquid developer containing a carrier liquid, toner particles insoluble in the carrier liquid, and a compound with a specific formula that improves electrophoretic mobility and prevents volume resistivity decline, along with a method involving shear force and heat treatment to enhance toner particle redispersibility and ultraviolet curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lecithin is added to liquid developer to improve toner particle dispersibility and charging performance, then electrophoretic mobility is improved, but volume resistivity undergoes large decline causing image blurring
Solution Approach 1:
The patent changes the chemical structure parameters of the charging regulator by specifying a phosphoric acid ester compound with particular molecular structure (formula 1) where R1-R6 represent specific alkyl groups with defined carbon chain lengths. This structural parameter change allows the compound to provide charging functionality while maintaining higher volume resistivity compared to conventional lecithin
Solution Approach 2:
The invention creates a composite charging system by combining the phosphoric acid ester compound (formula 1) with specific carrier liquids having defined viscosity ranges (10-1000 cSt) and toner particles with specific properties. This composite approach achieves both good dispersibility and maintained volume resistivity through synergistic material combinations
2Manufacturing precision
If lecithin is added to liquid developer to promote charge generation on toner particles, then charging performance is improved, but developing performance deteriorates due to volume resistivity decline
Solution Approach 1:
The patent optimizes the molecular structure parameters of the phosphoric acid ester compound by defining specific alkyl group configurations (R1-R6) and their carbon chain lengths. This parameter optimization enables the compound to generate sufficient charge on toner particles while maintaining volume resistivity at levels that preserve developing performance and prevent image blurring
3Manufacturing precision
If lecithin is dissolved in carrier liquid to improve dispersibility, then toner particle charging is enhanced, but ultraviolet-induced curing reaction is inhibited
Solution Approach 1:
The patent extracts the problematic functional groups from conventional lecithin that inhibit UV curing, and replaces them with a phosphoric acid ester structure that is UV-compatible. The compound of formula (1) is specifically designed to provide dispersibility and charging functions without containing moieties that would interfere with ultraviolet-induced curing reactions, thus resolving the conflict between dispersibility enhancement and curing compatibility
4Productivity
If lecithin is added to liquid developer, then electrophoresis-mediated development is improved, but toner particle aggregation is not effectively inhibited
Solution Approach 1:
The patent changes the surface interaction parameters by introducing a phosphoric acid ester compound with specific hydrophobic alkyl chains (R1-R6). These structural parameters enable the compound to adsorb onto toner particle surfaces and provide steric stabilization, preventing aggregation while maintaining electrophoretic mobility for effective development
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 enables reusable liquid developers with high image density and reduced image blurring, supporting faster process speeds and effective ultraviolet curing without inhibiting toner particle redispersibility.
Implementation Method 1
the addition of lecithin to liquid developers in order to bring about electrophoresis-mediated development by and transfer of the developer through the stable dispersion and charging of the toner particles in the carrier liquid
Implementation Method 2
a method of producing a liquid developer, that includes a step of applying a shear force
Implementation Method 3
a step of applying a heat treatment, to a mixture in which the carrier liquid, the toner particle insoluble in the carrier liquid, and the compound with formula (1) are mixed
Implementation Method 4
when the liquid developer is an ultraviolet-curable liquid developer, the lecithin dissolved in the carrier liquid inhibits the ultraviolet-induced curing reaction
Data Source
AI summary
Provided is a liquid developer that gives a high image density, has a high resistance, suppresses the appearance of image blurring, can be reused, is readily cured by ultraviolet radiation, and can accommodate higher process speeds. This liquid developer contains a carrier liquid, a toner particle insoluble in the carrier liquid, and a compound with the following formula (1)[In formula (1), R1 and R2 each independently represent an alkyl group having at least 13 and not more than 23 carbons.].