Browse Prior Art Database

Transfer Medium and Eradication

IP.com Disclosure Number: IPCOM000094986D
Original Publication Date: 1965-Aug-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 13K

Publishing Venue

IBM

Related People

Elbert, DL: AUTHOR

Abstract

The eradicable imaging system consists of a solid, coherent ink coated upon a polyethylene substrate. The coherent ink transfers from the polyethylene to ordinary paper upon impact from the die of a typewriter. The coherent, film-like nature of the ink results in a coherent body. This is in the form of the die sitting on the paper surface rather than penetrating into the capillaries of the paper. Instead of erasing by the usual abrasive technique, the ink body is removed by adhering it to an ordinary pressure sensitive adhesive tape and lifting away.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 59% of the total text.

Page 1 of 2

Transfer Medium and Eradication

The eradicable imaging system consists of a solid, coherent ink coated upon a polyethylene substrate. The coherent ink transfers from the polyethylene to ordinary paper upon impact from the die of a typewriter. The coherent, film-like nature of the ink results in a coherent body. This is in the form of the die sitting on the paper surface rather than penetrating into the capillaries of the paper. Instead of erasing by the usual abrasive technique, the ink body is removed by adhering it to an ordinary pressure sensitive adhesive tape and lifting away.

The transfer layer must fracture away from the substrate of the transfer medium in a body and then must cohere sufficiently so that it can be moved bodily away with a pressure sensitive tape during an erase operation.

The following mixture is solvent coated onto a polyethylene film. The solvent is then evaporated with the use of moderate heat. The mixture then remains on the polyethylene substrate as the inked transfer layer.

The mixture is as follows:

By weight

Cellulose acetate butyrate 20% 48% butyral, 6% acetyl, 0.7% hydroxyl

- falling ball viscosity 0.8 to 1.2 seconds

Butyl stearate 30% Dimethylcyclohexyl adipate 10% Channel black with Dye ppt. 40% Two parts carbon black to one part

methyl violet and victoria blue

- DS 1686, product of Dye Specialties Inc.

The first three ingredients are moderately mixed in B-ethyoxyethyl acetate to dissolve them and obtain a solution of 80% by weight solvent. The channel black is dispersed by ball milling in the same solvent to obtain a dispersion of 90% by weight 13-ethoxyethyl acetate. T...