Methods for rejuvenating an imaging member of an ink-based digital printing system

Patent metadata

Field	Value
Publication number	US-9744757-B1
Application number	US-201615240691-A
Country	US
Kind code	B1
Filing date	Aug 18, 2016
Priority date	Aug 18, 2016
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

Disclosed herein are methods for an ink-based digital printing system, comprising providing an imaging member a reimageable surface layer disposed on a structural mounting layer, the reimageable surface layer comprising a fluorosilicone elastomer and an infrared-absorbing filler comprising carbon black, and a plurality of surface defects on the reimageable surface layer, wherein the surface defects comprises carbon black exposed through the fluorosilicone elastomer of the reimageable surface layer. The method also comprises applying a coating of rejuvenating oil comprising an amino-functional organopolysiloxane to the reimageable surface layer, whereby at least a portion of the plurality of surface defects are coated by the amino-functional organopolysiloxane, thereby rejuvenating the imaging member.

First claim

The invention claimed is:

1. A method for an ink-based digital printing system, comprising:
i. providing an imaging member comprising:
a. a reimageable surface layer disposed on a structural mounting layer, the reimageable surface layer comprising a fluorosilicone elastomer and an infrared-absorbing filler comprising carbon black, and
b. a plurality of surface defects on the reimageable surface layer, wherein the surface defects comprises carbon black exposed through the fluorosilicone elastomer; and

ii. applying a coating of rejuvenating oil comprising an amino-functional organopolysiloxane to the reimageable surface layer, whereby at least a portion of the plurality of surface defects are coated by the amino-functional organopolysiloxane, thereby rejuvenating the imaging member, wherein the coating of rejuvenating oil is applied in an amount of less than 0.05 grams per square meter.

2. The method of claim 1 , wherein the amino-functional organopolysiloxane has the following Formula:

wherein
i. A represents —R 4 —X;
ii. X represents —NH 2 or —NHR 5 NH 2 ;
iii. R 4 and R 5 are the same or different and each is an alkyl having from 1 to 10 carbons;
iv. R 1 and R 2 are the same or different and each is an alkyl having from 1 to 25 carbons, an aryl having from 4 to 10 carbons, or an arylalkyl;
v. R 3 is an alkyl having from 1 to 25 carbons, an aryl having from about 4 to about 10 carbons, an arylalkyl, or a substituted diorganosiloxane chain having from 1 to 500 siloxane units;
vi. b and c are numbers and are the same or different and each satisfy the conditions of 0≦b≦10 and 10≦c≦1,000; and
vii. d and d′ are numbers and are the same or different and are 2 or 3, and e and e′ are numbers and are the same or different and are 0 or 1 and satisfy the conditions that d+e=3 and d′+e′=3; and
viii. b, e, and e′ must not all be 0 at the same time.

3. The method of claim 1 , wherein the amino-functional organopolysiloxane comprises an amino-functional group present in an amount of from 0.01 to 0.7 mol % amine.

4. The method of claim 1 , wherein the amino-functional organopolysiloxane comprises an alpha amino, an alpha-omega diamino, a pendant D-amino, a pendant D-diamino, a pendant T-amino or a pendant T-diamino group.

5. The method of claim 1 , wherein the rejuvenating oil is a blend of two or more amino-functional organopolysiloxanes.

6. The method of claim 1 , wherein the rejuvenating oil is a blend of the amino-functional organopolysiloxane and a non-functional silicone oil.

7. The method of claim 1 , wherein the fluorosilicone elastomer is a crosslinked fluorosilicone elastomer formed by a platinum-catalyzed crosslinking reaction between a vinyl-functional fluorosilicone and at least one of a hydride-functional silicone or a hydride-functional fluorosilicone, and wherein the infrared-absorbing filler comprising carbon black is dispersed throughout the vinyl-functional fluorosilicone before the crosslinking reaction.

8. The method of claim 1 , wherein the infrared-absorbing filler further comprises one or more of a metal oxide, carbon nanotubes, graphene, graphite, and carbon fibers.

Assignees

• Xerox Corp
• Palo Alto Res Ct Inc

Inventors

• Stowe Timothy D
• Anderson Gregory B
• Badesha Santokh S
• Kanungo Mandakini

Classifications

• B41C1/1008

  by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials · CPC title

• B41N1/003

  with ink abhesive means or abhesive forming means, such as abhesive siloxane or fluoro compounds, e.g. for dry lithographic printing · CPC title

• B41N3/006

  Cleaning, washing, rinsing or reclaiming of printing formes other than intaglio formes (B41N3/06 takes precedence) · CPC title

• G03G15/342

  by forming a uniform powder layer and then removing the non-image areas · CPC title

• G03G15/2057

  relating to the chemical composition of the heat element and layers thereof · CPC title