Browse Prior Art Database

Defoaming of Magnetic Inks

IP.com Disclosure Number: IPCOM000082052D
Original Publication Date: 1974-Sep-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Gardineer, BA: AUTHOR [+2]

Abstract

To make water base magnetic inks, 6-7% omega of nonionic and 1-2% omega of cationic surfactants are needed to disperse magnetite in ink. These large quantities of surfactants cause foaming of inks. Such foaming in magnetic ink jet printers cause a problem in both printing and handling of inks.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Defoaming of Magnetic Inks

To make water base magnetic inks, 6-7% omega of nonionic and 1-2% omega of cationic surfactants are needed to disperse magnetite in ink. These large quantities of surfactants cause foaming of inks. Such foaming in magnetic ink jet printers cause a problem in both printing and handling of inks.

The addition of defoaming or bubble-breaking agents prevents ink foaming. Generally defoaming anionic agents cannot be used in these inks, since they cause precipitation of the ink. A nonionic defoamer, such as Witco Chemicals cc-36 or ARDEFOAM* in amounts of 0.2-0.6% omega can be used to overcome the above problems. * Trademark of Armak Chemical Corp.

1