Chemical heat amplification in thermal transfer printing

Details Chemical heat amplification in thermal transfer printing Chemical heat amplification in thermal transfer printing

1982-12-30

1985-01-01

Wright, Jr., Ernest T.

Typewriting machines

Including interposed inking device for record-medium

Ribbon, per se

400118, 400120, 428913, 428914, B41J 3102

Patent

active

044914326

ABSTRACT:
Chemical heat amplification is provided in thermal transfer printing, wherein some of the heat necessary for melting and transferring ink from a solid fusible layer in a ribbon to a receiving medium is provided by an exothermic reaction. This chemical reaction is due to an exothermic material that is located in the ink layer, or in another layer of the ink bearing ribbon. The exothermic reaction reduces the amount of the input power which must be applied either electrically or with electromagnetic waves. Examples of suitable exothermic materials are those which will provide heat within the operative temperature range of the ink, and include nonaromatic azo compounds, peroxides, and strained valence compounds, such as monomers, dimers, trimers, of the type which change their chemical bonding when they decompose to either a valence isomer or break into a number of molecular species.

REFERENCES:
patent: 1560885 (1925-11-01), Walter
patent: 2982619 (1961-05-01), Long
patent: 3744611 (1973-07-01), Montanari et al.
patent: 4268368 (1981-05-01), Aviram et al.
IBM Technical Disclosure Bulletin, "Electrothermic Printing Method and Apparatus Using a Photoconductor and Fusible Ink", Aviram, vol. 20, No. 2, Jul. 1977, pp. 808-809.
IBM Technical Disclosure Bulletin, "Thermal Biasing Technique for Electrothermic Printing", Wilbur, vol. 23, No. 9, Feb. 1981, p. 4302.
IBM Technical Disclosure Bulletin, "Electrothermal Print Head", Wilbur, vol. 23, No. 9, Feb. 1981, pp. 4305-4306.
IBM Technical Disclosure Bulletin, "Polypyrrole Toluensulfonate Films for Resistive Ribbon", Diaz et al., vol. 23, No. 12, May 1981, p. 5552.
Soviet Powder Metallurgy and Metal Ceramics, "Solid-Phase Synthesis of Some Transistion Metal Silicides", Voronov et al., vol. 13, No. 12 (144), pp. 962-965, published May 1975.

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