Method of forming a release layer

Patent metadata

Field	Value
Publication number	US-9333534-B2
Application number	US-201114354202-A
Country	US
Kind code	B2
Filing date	Oct 27, 2011
Priority date	Oct 27, 2011
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

A method of forming a silicone release layer on a substrate, for an intermediate transfer member of a digital offset printing system, the method including:
a) providing a curable first primer on the substrate; b) providing a curable second primer on the substrate; c) providing a curable silicone release formulation on the curable first and second primers; and d) curing the first primer, the second primer and the release formulation.

First claim

What is claimed is:

1. A method of forming a silicone release layer on a substrate, for an intermediate transfer member of a digital offset printing system, the method including:
a) providing a curable first primer on the substrate;
b) providing a curable second primer on the substrate;
c) providing a curable silicone release formulation on the curable first and second primers; and
d) curing the first primer, the second primer and the release formulation,
wherein the first primer is curable by a condensation reaction and the second primer is curable by an addition reaction.

2. A method according to claim 1 , wherein the first primer comprises a first catalyst and the second primer comprises a second catalyst.

3. A method according to claim 2 , wherein the first catalyst comprises titanium and the second catalyst comprises platinum.

4. A method according to claim 1 , wherein the first primer comprises a first catalyst and an epoxysilane, and the first catalyst comprises an organic titanate or a titanium chelate.

5. A method according to claim 1 , wherein the second primer comprises a second catalyst, the second primer further comprises at least one of a vinyl silane, an allyl silane and an unsaturated silane, and the second catalyst comprises a Karstedt catalyst or a SIP6831.2 catalyst.

6. A method according to claim 1 , wherein the silicone release formulation comprises at least one of a vinyl silicone oil, a silicon hydride crosslinker, a Karstedt catalyst, a catalyst comprising a Pt(O) complex with vinylsiloxane ligands, an inhibitor, an acetylenic alcohol, tetramethyltetravinylcyclotetrasiloxane, tetramethyldivinyldisiloxane, a filler, amorphous silica, carbon black, a vinyl-terminated polydimethyl siloxane, a vinyl silicone, a divinyl tetramethyl disiloxane-platinum(0) complex, and an alkinol.

7. A method according to claim 1 , wherein the silicone release formulation is curable by an addition reaction using a catalyst comprising platinum.

8. A method according to claim 1 , wherein in steps a), b) and c) the substrate comprises an uncured acrylic rubber which is cured after performing steps a), b) and c).

9. A method according to claim 1 , wherein the curable first primer and the curable second primer are provided in steps a) and b) together as a mixture of the curable first and second primers.

10. The method of claim 1 , wherein curing the first primer, the second primer and the release formulation is performed simultaneously.

11. The method of claim 1 , wherein curing the first primer, the second primer, and the release formation comprises:
curing the first primer, the second primer, and the release formulation at 120° Celsius for one hour.

12. An intermediate transfer member for a digital offset printing system, comprising a substrate, a primer layer on the substrate, the primer layer comprising a first primer material and a second primer material, and a silicone release layer on the primer layer, wherein the first primer material comprises titanium and the second primer material comprises platinum.

13. An intermediate transfer member according to claim 12 , wherein the first primer material comprises an epoxysilane cured with a first catalyst comprising an organic titanate or a titanium chelate, and the second primer material comprises at least one of a vinyl silane, an allyl silane and an unsaturated silane cured with a second catalyst comprising a Karstedt catalyst or a SIP6831.2 catalyst.

14. An intermediate transfer member according to claim 12 , wherein the substrate comprises an acrylic rubber.

15. A digital offset printing system comprising an intermediate transfer member in accordance with claim 12 .

Assignees

• Soria Meir
• Rudoy Yevgenia
• Guslitzer Regina
• Slivniak Raia
• Raviv Oshra
• Hewlett Packard Indigo Bv

Inventors

• Soria Meir
• Rudoy Yevgenia
• Guslitzer Regina
• Slivniak Raia
• Raviv Oshra

Classifications

• Y10T428/31663

  As siloxane, silicone or silane · CPC title

• C08J7/042

  with two or more layers, where at least one layer of a composition contains a polymer binder · CPC title

• G03G15/162

  details of the the intermediate support, e.g. chemical composition · CPC title

• B05D7/582

  all layers being cured or baked together · CPC title

• C08J2483/04

  Polysiloxanes · CPC title