Polyester Toner Resin Composition for Offset Prevention
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Solution Overview
Problem
Existing polyester toner resins used in dry-type electrophotographic processes often suffer from undesirable 'off-setting' issues, where toner transfers to the fusing roller during the fixing process, leading to contamination and ghost images on subsequent substrates, and current Bis A-free alternatives exhibit brittleness and poor heat resistance.
Innovation Solution
The development of polyester toner resins comprising specific weight percentages of aromatic polycarboxylic acid, unsaturated aliphatic polycarboxylic acid, aliphatic diol, glycidyl ester of alkanoic acid, branching agents, and epoxy, with optional alkoxylated Bisphenol A, to achieve desired properties such as acid value, Tg, T1/2, and charge per mass, while minimizing Bis A usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crosslinked polyester is used to prevent offset, then off-setting is reduced, but the cost increases due to high cost of Bis A and environmental concerns
Solution Approach 1:
The patent modifies the chemical composition parameters by replacing Bis A with alternative aromatic compounds (such as phenolic compounds, resorcinol, hydroquinone) and adjusting the ratios of polycarboxylic acids, diols, and crosslinking agents to achieve the desired balance between offset prevention and cost/environmental compliance
Solution Approach 2:
The patent creates a composite resin system combining multiple components: aromatic polycarboxylic acids (terephthalic acid, isophthalic acid), aliphatic diols (ethylene glycol, propylene glycol), crosslinking agents (trimellitic anhydride, glycidyl esters), and alternative aromatic compounds to replace Bis A, achieving synergistic effects for offset prevention without relying on expensive Bis A
2Ease of manufacture
If Bis A-free toner resins are used, then environmental and toxicity concerns are reduced, but brittleness and poor heat resistance occur
Solution Approach 1:
The patent adjusts the molecular structure parameters by incorporating aromatic rings from alternative compounds (phenolic compounds, resorcinol, hydroquinone) and optimizing the crosslinking density through controlled ratios of crosslinking agents to maintain heat resistance and mechanical strength without Bis A
Solution Approach 2:
The patent develops a composite resin formulation combining aromatic polycarboxylic acids with alternative aromatic compounds and crosslinking agents to create a network structure that provides both environmental compliance and mechanical/thermal performance
3Strength
If alkoxylated Bisphenol A is included, then desirable toner resin properties are achieved, but Bis A usage increases
Solution Approach 1:
The patent modifies the aromatic compound composition by limiting alkoxylated Bis A to 0-25 weight percent and supplementing with alternative aromatic compounds (phenolic compounds, resorcinol, hydroquinone) to maintain the desired toner resin properties while reducing overall Bis A content
Solution Approach 2:
The patent uses multiple alternative aromatic compounds that can perform similar functions to Bis A, allowing flexibility in formulation to achieve desired properties while minimizing Bis A dependency
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 proposed toner resin composition reduces 'off-setting' and improves heat resistance, maintaining desirable properties like Tg and charge per mass, effectively addressing the limitations of current Bis A-free alternatives.
Implementation Method 1
A crosslinked polyester is typically obtained by reacting an esterified bisphenol A (Bis A) with dicarboxylic acid to produce a linear polyester
Implementation Method 2
reacting the produced linear polyester with trivalent or higher carboxylic acid, such as trimellitic acid anhydride
Implementation Method 3
polyester toner resins may include 40 to 65 weight percent of an aromatic polycarboxylic acid; 0 to 15 weight percent of an unsaturated aliphatic polycarboxylic acid; 6 to 50 weight percent of at least one of an aliphatic diol and a glycidyl ester of an alkanoic acid
Data Source
AI summary
Provided herein are polyester toner resins that may reduce or eliminate the use of Bis A, a common polyester toner resin material that may pose environmental and/or toxicity risks. In addition, the polyester toner resins according to some embodiments of the present invention may have desirable toner resin properties, such as hot offset resistance.