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Liquid electrophotographic inks

A liquid electrophotography and ink technology, which can be used in ink, electrography, and electric recording technology using charge graphics, and can solve problems such as charge dissipation.

Active Publication Date: 2015-04-29
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some embodiments, the photoconductor is first photosensitized, typically by charging with a corona discharge, and then exposed to light projected by the positive of the document to be reproduced, resulting in depletion of charge in the areas exposed to light. scattered

Method used

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  • Liquid electrophotographic inks
  • Liquid electrophotographic inks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 — Preparation of liquid electrophotographic ink

[0034] High melt viscosity ethylene acrylic acid copolymer resin (700 g DuPont TM the company's 925), high acid ethylene acrylic acid copolymer resin (300 grams of DuPont TM the company's 2806) and isoparaffins (1500 g Exxon Mobile ) were mixed in a twin planetary mixer at a ratio of 70:30 w / w high melt viscosity ethylene acrylic acid copolymer resin to high acid ethylene acrylic acid copolymer resin to provide approximately 40 wt% non-volatile solids, respectively. The slurry was heated to a temperature of 130°C during mixing and cooled to room temperature of approximately 22°C over a period of approximately 3 hours. The slurry is mixed with pigments, polyethylene wax, charge adjuvant and Combine in the attritor in the amounts listed in Table 1. The mixture was milled at 250 rpm at 50° C. (hot stage) for 1.5 hours and then at 37° C. (cold stage) for 10.5 hours to obtain the liquid electrophotographi...

Embodiment 2

[0037] Example 2 — Preparation of Comparative Liquid Electrophotographic Ink No. 1

[0038] Except that the resin mixture is a copolymer of ethylene and methacrylic acid (DuPont TM the company's ) and an ethylene acrylic acid copolymer resin with a melt viscosity of 15 poise and 15 wt% acid (Honeywell’s ) In addition to the 80:20 w / w ratio, under the specific conditions of Example 1, a comparative ink was prepared with specific amounts of components. The ink had a total resin melt viscosity of 5600 poise.

Embodiment 3

[0039] Example 3 — Preparation of Comparative Liquid Electrophotographic Ink No. 2

[0040] Except that the resin mixture is a (DuPont TM the company's ), a copolymer of ethylene and methacrylic acid (DuPont TM the company's ) and an ethylene acrylic acid copolymer resin with a melt viscosity of 15 poise and 15 wt% acid (Honeywell’s ) In addition to the 65:15:20 w / w ratio, under the specific conditions of Example 1, a comparative ink was prepared with specific amounts of components. The ink had a total resin melt viscosity of 11,400 poise.

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Abstract

The present disclosure provides for a liquid electrophotographic (LEP) ink comprising a carrier fluid, a pigment, a high melt viscosity ethylene acrylic acid copolymer resin, and a high acid ethylene acrylic acid copolymer resin. The high acid ethylene acrylic acid copolymer resin can have an acid content of at least 15 wt % and a viscosity of at least 8,000 poise. Additionally, the LEP ink can have a total resin acidity of at least 15 wt % and a total resin melt viscosity of at least 20,000 poise.

Description

Background technique [0001] Digital printing involves the technique of producing printed images directly from digital data, for example using electronic typesetting and / or desktop publishing programs. Some known digital printing methods include full color inkjet printing, electrophotographic printing, laser photo printing and thermal transfer printing methods. [0002] Electrophotographic printing techniques involve the formation of a latent image on the surface of a photoconductor mounted on an imaging plate. In some embodiments, the photoconductor is first photosensitized, typically by charging with a corona discharge, and then exposed to light projected by the positive of the document to be reproduced, resulting in depletion of charge in the areas exposed to light. scattered. The latent image is then developed into a full image by attracting oppositely charged toner particles to the remaining charge on the unexposed areas. The developed image is transferred from the phot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D11/50C09D11/108G03G9/13G03G9/08
CPCG03G9/12G03G9/125G03G9/132G03G9/16G03G15/10
Inventor 斯泰拉·斯托林·罗迪蒂海姆·科恩内塔·菲利普-格拉尼特罗伊·利拉兹埃亚尔·博丁格马克·克莱因纳瓦·克莱因埃亚尔·巴沙尔斯维萨·沙伊艾伯特·泰舍夫亚龙·格林瓦尔德费尔南达·奥尔利克伊拉尼特·莫
Owner HEWLETT PACKARD DEV CO LP
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