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Gel organosol including amphipatic copolymeric binder having selected molecular weight and liquid toners for electrophotographic applications

An amphiphilic copolymer, liquid electrophotography technology, applied in application, developer, electrography, etc., can solve the problems of self-stability printing ink brittleness, increased printing process cost, slow curing method and other problems, and achieve excellent images Effect of transfer printing, improvement of sedimentation stability

Inactive Publication Date: 2005-02-09
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method of curing is often too slow for use in high-speed printing methods
Additionally, this curing method significantly increases the cost of the printing process
Curable liquid toners often show poor self-stability and lead to brittleness of printed inks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0092] The copolymers of the present invention can be prepared by free radical polymerization methods known in the art, including but not limited to bulk, solution and dispersion polymerization methods. The resulting copolymers can have various structures, including linear chains, branched chains, three-dimensional networks, grafted structures, combinations thereof, and the like. Preferred embodiments are graft copolymers comprising one or more oligomer and / or polymer arms attached to an oligomer or polymer backbone. In graft copolymer embodiments, either the S moiety or the D moiety material may be incorporated into the arms and / or the backbone, as the case may be.

[0093] Free radically polymerized copolymers having grafted structures can be prepared using any number of reactions known to those skilled in the art. Common grafting methods include random grafting of multifunctional radicals; copolymerization of monomers and macromonomers; ring-opening polymerization of cycli...

Embodiment 1-6

[0146] Examples 1-6: Preparation of its polymer S material, also referred to herein as "grafted stabilizer"

Embodiment 1

[0147] Embodiment 1 (comparison)

[0148] Introduce 476g Norpar into a 32oz (0.96L) narrow neck glass bottle TM 12. 158g LMA, 5.0g 98% HEMA and 1.63g V-601. The bottle was purged with dry nitrogen at approximately 1.5 liters / minute for 1 minute and then sealed with a Teflon-lined screw cap. Secure the nuts in place with insulating tape. The sealed bottle was then inserted into a metal cage assembly and mounted on the stirrer assembly of an Atlas Launder-Ometer (Atlas Electric Devices Company, Chicago, IL). The Launder-Ometer was operated at a fixed stirring speed of 42 RPM with a water bath temperature of 70°C. The mixture was allowed to react for about 16-18 hours at which point the conversion of monomer to polymer was quantitative. The mixture was heated to 90°C and then heated at this temperature for 1 hour to destroy any remaining V-601, then cooled to room temperature.

[0149] The bottle was then opened and 2.5g of 95% DBTDL and 7.6g of TMI were added to the coole...

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PUM

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Abstract

The present invention provides liquid toner compositions in which the polymeric binder is chemically grown in the form of copolymeric binder particles dispersed in a liquid carrier. The polymeric binder comprises at least one amphiphilic copolymer comprising one or more S-material moieties and one or more D-material moieties, wherein the S-material moiety of the copolymer has molecular weight and solubility properties selected to provide Three-dimensional gels with controlled stiffness that can be reversibly reduced to a fluid state by application of energy. The toners described herein unexpectedly provide compositions especially suitable for electrophotographic processes in which an image is transferred from the surface of a photoconductor to an intermediate transfer material or directly without filming on the photoconductor. Transfer to print media.

Description

technical field [0001] The present invention relates to liquid toner compositions having utility in electrophotography. More specifically, the present invention relates to amphiphilic copolymer binder particles provided in gel compositions. Background technique [0002] In electrophotographic and xerographic processes (collectively referred to as electrophotographic processes), an electrostatic image is formed on the surface of a photoreceptive element or a dielectric element, respectively. The photoreceptive or dielectric element can be an intermediate transfer drum or belt or the substrate for the final toned image itself, as described by Schmidt, S.P. and Larson, J.R. in Handbook of Imaging Materials Diamond, A.S., Ed: Marcel Dekker: New York; Chapter 6, pages 227-252 and in US Patents 4,728,983, 4,321,404 and 4,268,598. [0003] In xerographic printing, a charged image is typically formed by (1) placing a charged image on a dielectric element...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/12G03G9/08G03G9/13
CPCG03G9/131G03G9/133G03G9/132A01M7/006A01M7/0082
Inventor 詹姆斯·A·贝克朱莉·Y·钱
Owner SAMSUNG ELECTRONICS CO LTD