Liquid Electrophotographic Ink Composition Viscosity Control
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Solution Overview
Problem
Conventional liquid electrophotographic ink compositions face challenges with high viscosity, limiting the increase in solids content and resulting in reduced image extraction and durability during the electrophotographic printing process.
Innovation Solution
A liquid electrophotographic ink composition comprising a carrier liquid and a resin with an acid copolymer and an acrylate copolymer, where the acrylate copolymer constitutes at least 30 wt.% of the alkyl (meth)acrylate monomer, reducing viscosity and enhancing the solids content and image durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the solids content of liquid electrophotographic ink composition is increased, then image durability and extraction are improved, but viscosity increases
Solution Approach 1:
The patent changes the chemical composition parameters of the resin by incorporating specific copolymers (ethylene-methacrylic acid copolymer with 10-30 wt% acid component and butyl methacrylate copolymer with 30-70 wt% ester component) to achieve the desired balance between viscosity and solids content. This parameter optimization allows increased solids content while maintaining acceptable viscosity levels for printability.
Solution Approach 2:
The patent uses a composite resin system combining multiple copolymers with complementary properties. The ethylene-methacrylic acid copolymer provides charge carrier functionality and adhesion, while the butyl methacrylate copolymer contributes to viscosity reduction and flexibility. This composite approach enables simultaneous improvement of image durability through higher solids content while maintaining processability.
2Productivity
If the solids content of liquid electrophotographic ink composition is increased, then image extraction is improved, but the ink becomes more viscous and harder to process
Solution Approach 1:
The patent optimizes the compositional parameters of the resin system by controlling the weight percentages of specific copolymers and their constituent monomers. The ethylene-methacrylic acid copolymer (10-30 wt% acid component) provides sufficient charge carrier density for good image extraction, while the butyl methacrylate copolymer (30-70 wt% ester component) acts as a viscosity modifier, maintaining processability even at elevated solids content.
Solution Approach 2:
The composite resin formulation combines functional copolymers with different roles: the ethylene-methacrylic acid copolymer ensures effective image extraction through its charge carrier properties, while the butyl methacrylate copolymer provides rheological control. This functional division within the composite material system enables simultaneous achievement of high productivity through improved extraction and ease of operation through controlled viscosity.
3Reliability
If conventional resin compositions are used, then manufacturing is simpler, but image durability and extraction are reduced
Solution Approach 1:
The patent employs a composite resin system consisting of ethylene-methacrylic acid copolymer and butyl methacrylate copolymer in specific proportions. This composite structure provides synergistic effects where the acid copolymer delivers charge carrier functionality for durable images and the ester copolymer ensures proper flow characteristics. While the composition is more complex than conventional single-polymer systems, the manufacturing process remains straightforward as it involves mixing pre-synthesized copolymers rather than complex polymerization procedures.
Data Source
Figure 1
Figure 2~3
AI summary
Herein is described a liquid electrophotographic ink composition including a carrier liquid and a resin including an acid copolymer and an acrylate copolymer, wherein the acrylate copolymer includes at least about 30 wt.% of the alkyl (meth)acrylate monomer.