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Liquid electrophotographic printing ink with charge director system

A technology of liquid electrophotography and charge director, which can be applied in the directions of developer, electrography, instrument, etc., and can solve problems such as printing defects

Inactive Publication Date: 2015-11-18
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, such printing systems suffer from printing defects such as streaking, which is a reflection of optical density variations in the printed area

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1 – Preparation of liquid electrophotographic (LEP) inks

[0050] Several LEP inks use alkaline BariumPetronate (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 isoparaffin oil (ISOPAR® L, ExxonMobile); ethylene acrylic acid copolymer, ethylene methacrylic acid copolymer; and Cabotmonarch800 to prepare . The percentages of LT, SCD and GT for different inks are shown in Table 1.

[0051] Table 1

[0052] 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 0.03

[0053] LT – Alkaline BariumPetronate;

[0054] SCD-Ba[(C 13 h 27 )-O-C(O)CH 2 CH(SO 3 - )C(O)-O-(C 1...

Embodiment 2

[0056] Example 2 – Conductivity of LEP ink

[0057] 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.

[0058]

Embodiment 3

[0059] Example 3 – Evaluation of LEP Ink No.11

[0060] 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.

[0061] table 3

[0062]

[0063] LT – Alkaline BariumPetronate;

[0064] 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 ;

[0065] GT-dodecylbenzenesulfonic acid isopropylamine salt

[0066] 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 a...

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PUM

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Abstract

The invention discloses a composition for printing a liquid electrophotographic printing ink and a method. The composition comprises a liquid binding agent, ink particles and a charge director system, wherein the director system comprises (i) a primary charge component; (ii) a secondary charge component; and (iii) an electric stability additive. The ink conductivities are provided by the charge director system as follows: the high-field conductivity is about 100pS / cm to about 500pS / cm; the low-field conductivity is about 20pS / cm to about 200pS / cm; the direct-current charge conductivity is less than about 30pS / cm; and the particle conductivity is 100pS / cm at least. In addition, the liquid electrophotographic printing ink can be prepared for printing of a liquid electrophotographic printer.

Description

[0001] This application entered the Chinese stage on May 5, 2011. The national application number is "200880131859.9", the international application number is "PCT / US2008 / 082500", and the invention title is "Liquid electrophotographic ink with charge director system" Divisional application of PCT application. technical field [0002] Compositions and methods for printing with liquid electrophotographic inks are described. Background technique [0003] 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. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/12
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