Additives to litho inks to eliminate ink feedback

Patent metadata

Field	Value
Publication number	US-10875338-B2
Application number	US-201214345747-A
Country	US
Kind code	B2
Filing date	Sep 20, 2012
Priority date	Sep 23, 2011
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

Provided are web-offset lithographic ink compositions that contain an alkyl thioether surfactant, an alkoxylated modified rosin, or a combination thereof. The ink compositions can be oil-based inks or water-based inks that can be radiation-curable. The resulting ink compositions can be used in web-offset lithographic printing to substantially reduce or eliminate the ink feedback and ink build-up that occurs during printing. Also provided are methods for reducing or eliminating ink feedback and build-up during lithographic printing processes.

First claim

What is claimed:

1. A radiation-curable web-offset lithographic ink composition, comprising:
a colorant;
a varnish; and
a water-soluble alkoxylated modified rosin, wherein the modified rosin is 10% to 70% alkoxylated;
wherein the modified rosin is present in an amount of from at or about 0.1% to at or about 10% by weight of the ink composition;
wherein the ink is a lithographic ink; and
wherein the ink is energy-curable; and
wherein the ink is suitable for use in a lithographic system wherein the printing plate is continuously treated with an aqueous fountain solution.

2. The composition of claim 1 , wherein the modified rosin is selected from among a methoxylated modified rosin, ethoxylated modified rosin, propoxylated modified rosin and butoxylated modified rosin.

3. The composition of claim 1 , wherein the modified rosin is at least 50% alkoxylated.

4. The composition of claim 1 , wherein the modified rosin is an ethoxylated modified rosin.

5. The composition of claim 1 , further comprising an ingredient selected from among a vehicle, a clay, an emulsion stabilizer, a wax, an oil and an emulsifier, or any combination thereof.

Assignees

• Sun Chemical Corp

Inventors

• Krishnan Ramasamy
• Jones Jeff
• Helliblau Matthias

Classifications

• C09D11/06

  based on fatty oils · CPC title

• C09D11/03

  characterised by features other than the chemical nature of the binder · CPC title

• C09D11/101

  Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing · CPC title

• B41M1/06 Primary

  Lithographic printing · CPC title

• C09D11/08

  based on natural resins · CPC title