INTERMEDIATE TRANSFER MEMBERS

• US 20190317432A1
• Filed: 04/10/2017
• Published: 10/17/2019
• Est. Priority Date: 04/10/2017
• Status: Active Grant

• Current Assignee: HP Indigo B.V. (HP Inc.)
• Original Assignee: HP Indigo B.V. (HP Inc.)
• Inventors: LIBSTER, Dima, INOTAEV, Sergey, VOLOSHIN FIROUZ, Dina, KAHATABI, Rafael, SHUNARY, Dafna
• Granted Patent: US 11,135,815 B2
• Time in Patent Office: Days
• CPC Class Codes: B32B 2255/26 Polymeric coating
• CPC Class Codes: B32B 2433/00 Closed loop articles
• CPC Class Codes: B32B 27/00 Layered products comprising a layer of synthetic resin fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18
• CPC Class Codes: G03G 15/10 using a liquid developer
• CPC Class Codes: G03G 15/162 details of the the intermediate support, e.g. chemical composition
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]

Abstract

The present disclosure relates to an intermediate transfer member for use in electrophotographic printing. The intermediate transfer member comprises a release layer comprising fluoropolymer particles dispersed in a silicone polymer matrix.

Claims

1. An intermediate transfer member for use in electrostatic printing, the intermediate transfer member comprising a release layer comprising fluoropolymer particles dispersed in a silicone polymer matrix.

2. An intermediate transfer member as claimed in claim 1, wherein the release layer comprises 0.25 to 3 wt % fluoropolymer particles based on the weight of silicone polymer.

3. An intermediate transfer member as claimed in claim 1, wherein the release layer comprises 0.75 to 2.5 wt % fluoropolymer particles based on the weight of silicone polymer.

4. An intermediate transfer member as claimed in claim 1, wherein the fluoropolymer is polytetrafluoroethylene.

5. An intermediate transfer member as claimed in claim 1, wherein the fluoropolymer particles have a particle size of less than 2 μ

m.

6. An intermediate transfer member as claimed in claim 1, wherein the fluoropolymer particles have a melting point of 300 to 400 degrees C.

7. An intermediate transfer member as claimed in claim 1, wherein the release layer further comprises an electrically conductive additive.

8. An intermediate transfer member as claimed in claim 7, wherein the electrically conductive additive is carbon black.

9. An intermediate transfer member as claimed in claim 8, wherein the release layer comprises carbon black in an amount of 0.5 to 5 weight % based on the weight of silicone polymer.

10. An intermediate transfer member as claimed in claim 1, wherein the release layer has a thickness of 3 to 10 microns.

11. An intermediate transfer member as claimed in claim 1, wherein the release layer is disposed on a primer layer comprising a silicone polymer.

12. An intermediate transfer member as claimed in claim 1, which comprises a fabric layer, a compressible layer disposed over the fabric layer, a conductive layer disposed over the compressible layer, a soft compliance layer disposed over the conductive layer, a primer layer disposed over the soft compliance layer and the release layer disposed over the primer.

13. A method of making an intermediate transfer member, said method comprising

applying a pre-cure release composition comprising at least one polysiloxane having crosslinkable moieties, and fluoropolymer particles onto a supporting substrate, and

curing the pre-cure release composition on the supporting substrate.

14. A method as claimed in claim 14, wherein the pre-cure release composition comprises 0.25 to 3 weight % fluoropolymer particles based on the total weight polysiloxane polymer in the pre-cure release composition.

15. An electrophotographic printer comprising an intermediate transfer member comprising a release layer comprising fluoropolymer particles dispersed in a silicone polymer matrix.