Ink jet faceplate coatings comprising structured organic films

a structured organic film and ink jet technology, applied in the field of coatings for the front face of ink jet printheads, can solve the problems of degrading print quality, affecting the quality of printed materials, so as to prevent ink contamination, prevent ink contamination, and reduce the effect of adhesion

Active Publication Date: 2013-01-03
XEROX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a coating for an ink jet printhead that prevents ink from adhering to the surface. This coating, called a structured organic film (SOF), consists of a plurality of segments and linkers arranged as a covalent organic framework (COF). After many cleaning cycles, the coating remains effective without leaving any residue. The coating also results in a high contact angle for ink, meaning the ink is better held within the nozzle until it is ready to be ejected. Overall, this coating improves the holding pressure of the ink and reduces or eliminates ink weeping out of the nozzle.

Problems solved by technology

One difficulty faced by fluid ink jet systems is wetting, drooling or flooding of inks onto the printhead front face.
The contaminated front face can cause or contribute to non-firing or missing drops, undersized or otherwise wrong-sized drops, satellites, or misdirected drops on the recording medium and thus result in degraded print quality.
However, this is generally not a straightforward procedure: blending Teflon, Viton, or custom fluorinated polymers can be challenging due to their poor solubility with the nominal components of a given film.
These coatings have poor adhesion to the inkjet faceplate materials (stainless steel and polyimide) resulting in short lifetimes for the inkjet print heads.
The poor adhesion of the current fluorpolymers to the stainless steel faceplate results in flaking and pealing of the coating during print head handling and cleaning.
A wetted, contaminated printhead front face interferes with the collecting of the purged ink by preventing or reducing the ability of the ink to slide over the front face into the waste reservoir.

Method used

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  • Ink jet faceplate coatings comprising structured organic films
  • Ink jet faceplate coatings comprising structured organic films
  • Ink jet faceplate coatings comprising structured organic films

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0180](Action A) Preparation of the liquid containing reaction mixture. The following were combined: the building block N,N,N′,N′-tetrakis-[(4-hydroxymethyl)phenyl]-biphenyl-4,4′-diamine (2.64 g); the building block N,N′-bis-(3-hydroxyphenyl)-N,N′-diphenyl-biphenyl-4,4′-diamine (3.73 g); the additive Cymel 303 (67 mg), the additive Silclean 3700 (264 mg), the catalyst Nacure 5225 (132 mg) and Dowanol (18.48 g). The mixture was shaken and heated to 55° C. for 60 minutes. Upon cooling to room temperature, the solution was filtered through a five micron PTFE membrane.

[0181](Action B) Deposition of reaction mixture as a wet film. The reaction mixture was applied to a substrate (either polyimide or stainless steel sheets) using a constant velocity draw-down coater outfitted with a bird bar having a 2 mil gap.

[0182](Action C) Promotion of the change of the wet film to a dry SOF. The substrate (polyimide and stainless steel sheets) supporting the wet layer was rapidly transferred to an act...

example 2

[0183](Action A) Preparation of the liquid containing reaction mixture. The following were combined: the building block octafluoro-1,6-hexanediol [segment=octafluoro-1,6-hexyl; Fg=hydroxyl (—OH); (0.43 g, 1.65 mmol)], a second building block N4,N4,N4′,N4′-tetrakis(4-(methoxymethyl)phenyl)biphenyl-4,4′-diamine [segment=N4,N4,N4′,N4]-tetra-p-tolylbiphenyl-4,4′-diamine; Fg=methoxy ether (—OCH3); (0.55 g, 0.82 mmol)], an acid catalyst delivered as 0.05 g of a 20 wt % solution of Nacure XP-357 to yield the liquid containing reaction mixture, a leveling additive delivered as 0.04 g of a 25 wt % solution of Silclean 3700, and 2.96 g of 1-methoxy-2-propanol. The mixture was shaken and heated at 85° C. for 2.5 hours, and was then filtered through a 0.45 micron PTFE membrane.

[0184](Action B) Deposition of reaction mixture as a wet film. The reaction mixture was applied to the reflective side of a metalized (TiZr) MYLAR™ substrate using a constant velocity draw down coater outfitted with a bir...

example 3

[0186](Action A) Preparation of the liquid containing reaction mixture. The following were combined: the building block dodecafluoro-1,8-octanediol [segment=dodecafluoro-1,8-octyl; Fg=hydroxyl (—OH); (0.51 g, 1.41 mmol)], a second building block N4,N4,N4′,N4′-tetrakis(4-(methoxymethyl)phenyl)biphenyl-4,4′-diamine [segment=N4,N4,N4′,N4′-tetra-p-tolylbiphenyl-4,4′-diamine; Fg=methoxy ether (—OCH3); (0.47 g, 0.71 mmol)], an acid catalyst delivered as 0.05 g of a 20 wt % solution of Nacure XP-357 to yield the liquid containing reaction mixture, a leveling additive delivered as 0.04 g of a 25 wt % solution of Silclean 3700, and 2.96 g of 1-methoxy-2-propanol. The mixture was shaken and heated at 85° C. for 2.5 hours, and was then filtered through a 0.45 micron PTFE membrane.

[0187](Action B) Deposition of reaction mixture as a wet film. The reaction mixture was applied to the reflective side of a metalized (TiZr) MYLAR™ substrate using a constant velocity draw down coater outfitted with a...

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Abstract

A coating for an ink jet printhead front face, wherein the coating comprises a structured organic film (SOF) comprising a plurality of segments, a plurality of linkers arranged as a covalent organic framework. Methods for preparing a coating for an ink jet printhead front face, wherein the coating comprises a SOF are also disclosed.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This nonprovisional application is related to U.S. patent application Ser. Nos. 12 / 716,524; 12 / 716,449; 12 / 716,706; 12 / 716,324; 12 / 716,686; 12 / 716,571; 12 / 815,688; 12 / 845,053; 12 / 845,235; 12 / 854,962; 12 / 854,957; and 12 / 845,052 entitled “Structured Organic Films,”“Structured Organic Films Having an Added Functionality,”“Mixed Solvent Process for Preparing Structured Organic Films,”“Composite Structured Organic Films,”“Process For Preparing Structured Organic Films (SOFs) Via a Pre-SOF,”“Electronic Devices Comprising Structured. Organic Films,”“Periodic Structured Organic Films,”“Capped Structured Organic Film Compositions,”“Imaging Members Comprising Capped Structured Organic Film Compositions,”“Imaging Members for Ink-Based Digital Printing Comprising Structured Organic Films,”“Imaging Devices Comprising Structured. Organic Films,” and “Imaging Members Comprising Structured Organic Films,” respectively; and U.S. Provisional Application No...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): B41J2/135B05D3/00B05D5/00C09D7/00
CPCC09D5/1662B41J2/14008Y10T428/26B41J2/1606B41J2/14233B41J2/01B41J29/38
InventorHEUFT, MATTHEW A.COTE, ADRIEN P.CHRETIEN, MICHELLE N.
OwnerXEROX CORP