Undercoat layer with low release force for aqueous printing transfix system

Patent metadata

Field	Value
Publication number	US-9902867-B2
Application number	US-201615181281-A
Country	US
Kind code	B2
Filing date	Jun 13, 2016
Priority date	Oct 2, 2014
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

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 coating composition 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 hydrophilic polymer is a starch and the at least one non-reactive silicone is a polyether modified polysiloxane;
wherein the at least one non-reactive silicone release agent is present in an amount ranging from about 0.001% to less than about 0.1% by weight relative to the total composition weight.

2. The coating composition according to claim 1 , 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.

3. The coating composition according to claim 1 , wherein the at least one hydrophilic polymer is selected from a non-ionic waxy maize starch and a cationic waxy maize starch.

4. The coating composition according to claim 1 , wherein a viscosity of the at least one hydrophilic polymer in a DI water solution at 20° C. ranges from about 3 cps to about 800 cps, wherein the solution contains about 5% by weight hydrophilic polymer relative to a total weight of the at least one hydrophilic polymer and DI water in the solution.

5. The coating composition according to claim 1 , wherein the at least one hygroscopic agent is chosen from glycerin, sorbitol, vinyl alcohols, glycols, xylitol, maltitol, polymeric polyols, glyceryl triacetate, glycouril, Ionic liquids and mixtures thereof.

Assignees

• Xerox Corp

Inventors

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

Classifications

• C09D101/284

  with hydroxylated hydrocarbon radicals · CPC title

• C08K5/42

  Sulfonic acids; Derivatives thereof · CPC title

• B41N10/04

  multi-layer · CPC title

• B32B27/285

  comprising polyethers · CPC title

• C09D5/20

  for coatings strippable as coherent films, e.g. temporary coatings strippable as coherent films · CPC title