Undercoat layer with low release force for aqueous printing transfix system

Patent metadata

Field	Value
Publication number	US-9744790-B2
Application number	US-201615181320-A
Country	US
Kind code	B2
Filing date	Jun 13, 2016
Priority date	Oct 2, 2014
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

Disclosed herein are sacrificial coating compositions comprising at least one hydrophilic polymer; at least one hygroscopic agent; at least one surfactant; at least one non-reactive silicone release agent; and water. In certain embodiments, the at least one non-reactive silicone release agent is chosen from polyether modified polysiloxane and nonreactive silicone glycol copolymers. In certain embodiments, the at least one non-reactive silicone release agent may be present in an amount ranging from about 0.001% to about 2%, based on the total weight of the composition, such as from about 0.03% to about 0.06%. Also disclosed herein is a blanket material suitable for transfix printing comprising a sacrificial coating composition, as well as an indirect printing process comprising a step of applying a sacrificial coating composition to a blanket material.

First claim

What is claimed is:

1. A blanket material suitable for transfix printing comprising:
a first substrate comprising at least one of polysiloxane rubber and fluorinated polymers;
a sacrificial coating disposed over the first substrate, the sacrificial coating comprising at least one hydrophilic polymer; at least one surfactant; at least one hygroscopic agent; at least one non-reactive silicone release agent; and water.

2. The blanket material according to claim 1 , wherein the at least one non-reactive silicone release agent is chosen from polyether modified polysiloxane and nonreactive silicone glycol copolymers.

3. The blanket material according to claim 1 , wherein the at least one hydrophilic polymer is selected from the group consisting of waxy maize starch, polyvinyl alcohol, poly(vinyl alcohol-co-ethylene), poly(acrylic acid)-poly(vinyl alcohol) copolymer, polyvinyl alcohol-acrylic acid-methyl methacrylate copolymer, poly(vinylpyrrolidinone) (PVP), poly(ethylene oxide), hydroxyethyl cellulose, cellulose acetate, poly(ethylene glycol), copolymers of poly(ethylene glycol), polyacrylamide (PAM), poly(N-isopropylacrylamide) (PNIPAM), poly(acrylic acid), polymethacrylate, acrylic polymers, maleic anhydride copolymers, sulfonated polyesters, and the mixtures thereof.

4. An indirect printing process comprising:
providing an ink composition to an inkjet printing apparatus comprising an intermediate transfer member;
applying a sacrificial coating composition onto the intermediate transfer member to form a sacrificial coating, wherein the sacrificial coating composition comprises at least one hydrophilic polymer; at least one surfactant; at least one hygroscopic agent; at least one non-reactive silicone release agent; and water;
ejecting droplets of ink in an imagewise pattern onto the sacrificial coating in a dried or a semi-dried state;
at least partially drying the ink to form an ink pattern on the intermediate transfer member; and
transferring the ink pattern and the sacrificial coating from the intermediate transfer member to a substrate.

5. The indirect printing process according to claim 4 , wherein the at least one hydrophilic polymer is selected from the group consisting of waxy maize starch, polyvinyl alcohol, poly(vinyl alcohol-co-ethylene), poly(acrylic acid)-poly(vinyl alcohol) copolymer, polyvinyl alcohol-acrylic acid-methyl methacrylate copolymer, poly(vinylpyrrolidinone) (PVP), poly(ethylene oxide), hydroxyethyl cellulose, cellulose acetate, poly(ethylene glycol), copolymers of poly(ethylene glycol), polyacrylamide (PAM), poly(N-isopropylacrylamide) (PNIPAM), poly(acrylic acid), polymethacrylate, acrylic polymers, maleic anhydride copolymers, sulfonated polyesters, and the mixtures thereof.

6. The indirect printing process according to claim 4 , wherein the at least one non-reactive silicone release agent is chosen from polyether modified polysiloxane and nonreactive silicone glycol copolymers.

7. The indirect printing process according to claim 4 , wherein the at least one non-reactive silicone release agent comprises dimethyl, methyl (polyethylene oxide acetate-capped) siloxane, present in an amount of at least about 70% of the total amount of the release agent.

8. A blanket material suitable for transfix printing comprising:
a first substrate comprising at least one of polysiloxane rubber and fluorinated polymers;
a second substrate on top of the first substrate comprising a sacrificial coating
comprising at least one hydrophilic polymer; at least one surfactant; at least one hygroscopic agent; at least one non-reactive silicone release agent; and water, wherein the at least one non-reactive silicone release agent comprises dimethyl, methyl (polyethylene oxide acetate-capped) siloxane, present in an amount of at least about 70% of the total amount of the release agent.

9. The blanket material according to claim 8 , wherein the at least one non-reactive silicone release agent is present in an amount ranging from about 0.001% to about 2% by weight relative to a total composition weight.

10. The blanket material according to claim 8 , wherein the at least one non-reactive silicone release agent is chosen from polyether modified polysiloxane and nonreactive silicone glycol copolymers.

11. The blanket material according to claim 8 , wherein the at least one hydrophilic polymer is selected from the group consisting of waxy maize starch, polyvinyl alcohol, poly(vinyl alcohol-co-ethylene), poly(acrylic acid)-poly(vinyl alcohol) copolymer, polyvinyl alcohol-acrylic acid-methyl methacrylate copolymer, poly(vinylpyrrolidinone) (PVP), poly(ethylene oxide), hydroxyethyl cellulose, cellulose acetate, poly(ethylene glycol), copolymers of poly(ethylene glycol), polyacrylamide (PAM), poly(N-isopropylacrylamide) (PNIPAM), poly(acrylic acid), polymethacrylate, acrylic polymers, maleic anhydride copolymers, sulfonated polyesters, and the mixtures thereof.

12. The blanket material of claim 8 , wherein the presence of the at least one non-reactive silicone release agent in the sacrificial coating in a dried or a semi-dried state results in the sacrificial coating to have a release force of less than about 15 g/cm between the first substrate and the sacrificial coating.

13. The blanket material of claim 8 , wherein the at least one non-reactive silicone release agent is present in an amount ranging from about 0.001% to about 2% by weight relative to a total composition weight.

14. The blanket material of claim 1 , wherein the presence of the at least one non-reactive silicone release agent in the sacrificial coating in a dried or a semi-dried state results in the sacrificial coating to have a release force of less than about 15 g/cm between the first substrate and the sacrificial coating.

15. The blanket material of claim 1 , wherein the at least one non-reactive silicone release agent is present in an amount ranging from about 0.001% to about 2% by weight relative to a total composition weight.

Assignees

• Xerox Corp

Inventors

• Song Guiqin
• Yang Suxia
• Sisler Gordon
• Zwartz Edward G

Classifications

• B32B23/046

  of natural rubber or synthetic rubber · CPC title

• B41N10/02

  Blanket structure · CPC title

• C09D129/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• C09D7/125

  Chemistry & Metallurgy · mapped topic

• C08L83/04

  Polysiloxanes · CPC title