Browse Prior Art Database

Matrix Transfer Medium Formulations

IP.com Disclosure Number: IPCOM000046450D
Original Publication Date: 1983-Jul-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Beach, BL: AUTHOR [+6]

Abstract

Matrix transfer media of the general kind described in U. S. Patents 3,413,184 and 3,485,903 hold ink in a matrix or sponge-like body of resin. The ink is squeezed out under impact of a print element. Use of the olelylamine as a surfactant facilitates darker printing from a carbon-black-containing non-polar ink vehicle.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 63% of the total text.

Page 1 of 1

Matrix Transfer Medium Formulations

Matrix transfer media of the general kind described in U. S. Patents 3,413,184 and 3,485,903 hold ink in a matrix or sponge-like body of resin. The ink is squeezed out under impact of a print element. Use of the olelylamine as a surfactant facilitates darker printing from a carbon-black-containing non-polar ink vehicle.

Carbon blacks in general are known to contain acidic functionalities on their surfaces. This property attracts basic materials, such as primarily aliphatic amines, to the surface of the carbon black. Olelylamine is thereby strongly attracted to the surface of a carbon black, especially one having unneutralized acid properties.

In addition to having the basic end, the primary aliphatic amine also has a hydrophobic aliphatic chain which extends out from the carbon black. When the coating is hydrophilic (such as water or ethanol solutions), these chains are repelled from the solvent. (This is shown by flocculation of carbon black particles by bridging and by generally poor carbon black dispersion in hydrophilic solutions.)

In a dispersion of a resin dissolved in ethyl alcohol and an ink vehicle of oil, olelylamine functions to cause the carbon black to remain in the oil phase as the alcohol is expelled. During this drying process, droplets of incompatible oil form and eventually become trapped in the polymer matrix. Absent the aliphatic amine surfactant, the carbon black tends to be trapped in the polymer matrix an...