Liquid electrophotographic ink with a charge director system

A technology of liquid electrophotography and charge director, which can be used in inks, developers, household appliances, etc., and can solve problems such as printing defects

Inactive Publication Date: 2011-09-28
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, such printing systems suffer from printing defects such as str

Method used

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  • Liquid electrophotographic ink with a charge director system
  • Liquid electrophotographic ink with a charge director system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1 – Preparation of liquid electrophotographic (LEP) inks

[0048] Several LEP inks use alkaline Barium Petronate (LT); Ba[(C 13 h 27 )-O-C(O)CH 2 CH(SO 3 - )C(O)-O-(C 13 h 27 )] 2 and BaHPO 4( SCD); isopropylamine dodecylbenzenesulfonate (GT); light isoparaffinic oil (ISOPAR® L, Exxon Mobile); ethylene acrylic acid copolymer, ethylene methacrylic acid copolymer; and Cabot monarch 800 to prepare. The percentages of LT, SCD and GT for different inks are shown in Table 1.

[0049] Table 1

[0050] Charged System No.

SCD

LT

GT

1

0.04

0.1

0.06

2

0.02

0.1

0.06

3

0.01

0.1

0.06

4

0.04

0.08

0.06

5

0.04

0.06

0.04

6

0.04

0.04

0.06

7

0.04

0.1

0.04

8

0.04

0.1

0.02

9

0.04

0.1

0.01

10

0.02

0.08

0.04

11

0.04

0.14

0.06

12

0.03

0.1

0.08

13

0.05

0.08

0.0...

Embodiment 2

[0054] Example 2 – Conductivity of LEP ink

[0055] During preparation, the conductivity of the LEP ink of Example 1 was tested after 3 hours and 18 hours of electrophorhetic mobility. The results are shown in Table 2.

[0056]

Embodiment 3

[0057] Example 3 – Evaluation of LEP Ink No.11

[0058] The LEP ink No. 11 of Example 1 was further evaluated for streak performance. The SCD / LT / GT ratio of LEP Ink No. 11 was slightly changed to provide two additional LEP inks (11a and 11b). In addition, a comparative LEP ink without the charge director system of the present invention was used as indicated by the SCD / LT / GT ratio. All inks were formulated according to the composition of LEP Ink No. 11 except for the ratio of SCD / LT / GT shown. Table 3 shows the obtained conductivity before and after printing.

[0059] table 3

[0060]

[0061] LT – Alkaline Barium Petronate;

[0062] SCD-Ba[(C 13 h 27 )-O-C(O)CH 2 CH(SO 3 - )C(O)-O-(C 13 h 27 )] 2 and BaHPO 4 ;

[0063] GT-dodecylbenzenesulfonic acid isopropylamine salt

[0064] As shown in Table 3, LEP inks No. 11, 11a and 11b achieved a low-field conductivity of at least 20 pS / cm, while the comparative ink did not. The LEP inks are stable after printing...

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PUM

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Abstract

The present disclosure is drawn to compositions and methods for a liquid electrophotographic ink printing. The composition comprises a liquid vehicle; ink particles; and a charge director system, comprising i) a primary charge component, ii) a secondary charge component, and iii) an electrical stability additive; such that the charge director system provides the following ink conductivities: a high field conductivity of about 100 pS/cm to about 500 pS/cm, a low field conductivity of about 20 pS/cm to about 200 pS/cm, a direct charge conductivity less than about 30 pS/cm, and a particle conductivity of at least 100 pS/cm. Additionally, the liquid electrophotographic ink can be formulated for printing from a liquid electrophotographic printer.

Description

Background technique [0001] In many printing systems, it is common practice to develop a hard copy of the image by using a photoconductive surface. The photoconductive surface is selectively charged with a latent electrostatic image having image and background regions. For example, a liquid developer comprising charged toner particles in a carrier liquid can be brought into contact with the selectively charged photoconductive surface. The charged toner particles adhere to the image area of ​​the latent image, while the background area remains clear. The latent image is transferred by contacting a hardcopy material, such as paper or other printing substrate, directly or indirectly, to the photoconductive surface. Variations of this method utilize different means to form an electrostatic latent image on a photoreceptor or on a dielectric material. [0002] Typically, the liquid developer comprises a thermoplastic resin as a binder for the toner particles, and a non-polar liqu...

Claims

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Application Information

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IPC IPC(8): C09D11/00
CPCC09D11/52G03G9/12C09D11/03G03G9/135
Inventor I.莫尔S.斯坦E.西尔科夫A.泰谢夫J.科尼罗夫
Owner HEWLETT PACKARD DEV CO LP
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