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Magnetic Transfer Medium

IP.com Disclosure Number: IPCOM000095978D
Original Publication Date: 1964-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Miller, LF: AUTHOR [+2]

Abstract

A magnetic transfer medium for impact printing includes a polyester film, such as polyethylene terephthalate, and a transfer medium coating adhering to the film. Sharp cleavage of the transferred image with impact occurs because of the dispersion of fine particles of wax throughout the transfer medium coating.

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Magnetic Transfer Medium

A magnetic transfer medium for impact printing includes a polyester film, such as polyethylene terephthalate, and a transfer medium coating adhering to the film. Sharp cleavage of the transferred image with impact occurs because of the dispersion of fine particles of wax throughout the transfer medium coating.

Complete localized transfer of the impacted coating is achieved by controlling the adhesion of the coating to the polyester film by the presence of certain surfactants in the coating. The surfactant, when applied to the film as an ingredient of the coating, migrates with time through the coating to the interface of the coating and the film. The preferred surfactant for polyester films is the reaction product of methyl violet and 12-hydroxy stearic acid.

The following is an example of a typical magnetic transfer coating which can be applied to polyester films by conventional coating techniques using toluene as the vehicle: Parts by Weight Magnetic iron oxide 38. Carnuba wax 25. Ethyl hydroxyl ethyl cellulose 7. 8 Polystyrene resin 8. Petroleum non-volatile oil 17. Surfactant (reaction product of methyl violet and 12-hydroxy stearic acid) 4. Antioxidants (ditertiary butyl p-cresol) 0. 2.

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