Stock material or miscellaneous articles – Thermal transfer donor – Specialized heat source contacting layer on support
Reexamination Certificate
2007-10-30
2007-10-30
Hess, Bruce H. (Department: 1774)
Stock material or miscellaneous articles
Thermal transfer donor
Specialized heat source contacting layer on support
C503S227000
Reexamination Certificate
active
10795431
ABSTRACT:
A thermal ink ribbon has a base sheet, a thermal recording layer arranged on one side of the base sheet, and a back layer arranged on an opposite side of the base sheet. The back layer according to the present invention comprises a polyurethane resin which is obtained by reacting a low molecular weight polymer having at least one active-hydrogen-containing group at one end of the molecule, a compound having at least one active-hydrogen group and at least one hydrophilic group except a hydroxide group, with a polyisocyanate. The back layer is excellent in the adhesiveness to a base sheet, the heat resistance relative to a thermal head and slipperiness to a thermal head; and the ink ribbon with such a back layer has no problems in printed characters and figures on printing, in the migration of impurities from the back layer into an ink layer, in smeariness of a thermal head and in its maintenance. Such a back layer is capable of being formed on a surface of a base sheet by only applying the coating, which comprises the above polyurethane resin, for forming a back layer; and drying the coated layer.
REFERENCES:
patent: 4975332 (1990-12-01), Shini et al.
patent: 0 324 946 (1989-07-01), None
patent: 61 227087 (1986-10-01), None
patent: 01 011888 (1989-01-01), None
Database WPI, Section Ch, Week 199146, Derwent Publications Ltd., London, GB, Class A28, AN 1991-337168, XP002320428.
Hanada Kazuyuki
Kamita Tomoaki
Kawaguchi Takeshi
Torii Katsutoshi
Umezu Motoaki
Dainichiseika Color & Chemicals Mfg. Co. Ltd.
Hess Bruce H.
Ukima Colour & Chemicals Mfg. Co. Ltd.
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