Topcoat composition of imaging blanket with improved properties

Patent metadata

Field	Value
Publication number	US-11767447-B2
Application number	US-202117152551-A
Country	US
Kind code	B2
Filing date	Jan 19, 2021
Priority date	Jan 19, 2021
Publication date	Sep 26, 2023
Grant date	Sep 26, 2023

Abstract

Provided herein is a topcoat composition comprising at least one fluorosilicone, a hydride-functional crosslinking agent, an infrared-absorbing filler, and at least one dispersant that is non-reactive with the hydride-functional crosslinking agent, by weight based on a total weight of the topcoat composition, wherein the topcoat composition has a degree of crosslinking between about 10 micrograms/hour/milligrams to about 20 micrograms/hour/milligrams. Further provided herein are methods of making the topcoat composition, as well as an imaging blanket and methods of reducing coating defects on a media coated using the imaging member.

First claim

What is claimed is:

1. A topcoat composition for a variable data lithography imaging blanket comprising:
at least one fluorosilicone;
at least one hydride-functional crosslinking agent;
at least one infrared-absorbing filler; and
at least one dispersant comprising a polymeric perfluorobutane sulfonic acid derivative or a polycaprolactone-aromatic polyisocyanurate that is non-reactive with the hydride-functional crosslinking agent.

2. The topcoat composition of claim 1 , wherein the topcoat composition has a degree of crosslinking between about 10 micrograms/hour/milligrams to about 20 micrograms/hour/milligrams.

3. The topcoat composition of claim 1 , wherein the dispersant is present in an amount ranging from about 0.1% to about 5%, based on a total weight of the topcoat composition.

4. The topcoat composition of claim 1 , wherein the dispersant is present in the topcoat composition in an amount ranging from about 0.5% to about 3.0%, based on a total weight of the topcoat composition.

5. The topcoat composition of claim 1 , wherein the at least one infrared-absorbing filler is carbon black.

6. The topcoat composition of claim 1 , wherein the at least one fluorosilicone is chosen from vinyl-terminated trifluoropropyl methylsiloxane polymer.

7. The topcoat composition of claim 1 , wherein the at least one fluorosilicone is present in the topcoat composition in an amount ranging from about 40% to about 80% by weight, based on the total weight of the topcoat composition.

8. The topcoat composition of claim 1 , wherein the at least one dispersant does not comprise an amine-functional dispersant.

9. The topcoat composition of claim 1 , wherein the at least one dispersant further comprises a polyethylene glycol-hydroxystearic acid copolymer.

10. The topcoat composition of claim 1 , wherein the at least one hydride-functional crosslinking agent is methyl hydrosiloxane-trifluoropropylmethyl siloxane.

11. The topcoat composition of claim 1 , further comprising at least one catalyst.

12. The topcoat composition of claim 11 , wherein the at least one catalyst is a platinum catalyst.

13. An imaging blanket for variable data lithography comprising:
a substrate; and
a topcoat composition according to claim 1 .

14. The imaging blanket of claim 13 , wherein the substrate comprises at least one material selected from the group consisting of metals, polyimides, plastic composites, and woven fabrics.

15. The imaging blanket of claim 13 , wherein the topcoat composition has a thickness ranging from about 0.5 μm to about 4 mm.

16. The imaging blanket of claim 13 , wherein the topcoat composition is cured to the substrate at a temperature ranging from about 135° C. to about 165° C. for a time period ranging from about 15 minutes to about 5 hours.

Assignees

• Xerox Corp

Inventors

• Dinh Kenny-Tuan T
• Klymachyov Alexander N
• Ma Lin
• Tallman Kyle B
• Dudek Eric Robert
• Mehan Michael L
• Freitas Jr Harry F
• Schnuerch Angela
• Roetker Michael S
• Le Ngoc-Tram
• Sambhy Varun
• Badesha Santokh S

Classifications

• C09D183/08 Primary

  containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen · CPC title

• B41C1/1016

  characterised by structural details, e.g. protective layers, backcoat layers or several imaging layers · CPC title

• B41M1/06

  Lithographic printing · CPC title

• C09D5/32 Primary

  Radiation-absorbing paints {(protection against X-, gamma- or corpuscular radiation G21F)} · CPC title

• C09D7/41

  Organic pigments; Organic dyes · CPC title