Compositions: coating or plastic – Coating or plastic compositions – Marking
Patent
1997-04-29
1999-10-26
Bell, Mark L.
Compositions: coating or plastic
Coating or plastic compositions
Marking
106 316, 106 3186, 106 3158, 106 3143, 106 3175, C09D 1100
Patent
active
059720824
ABSTRACT:
An aqueous ink composition contains a colorant and a humectant, and has a surface tension .gamma. of less than 50 mN/m when measured by a maximum bubble pressure method at 25.degree. C., with a bubble frequency .nu. of the aqueous ink composition being set at less than 1 Hz, and a surface tension .gamma. of more than 40 mN/m when measured by the maximum bubble pressure method at 25.degree. C., with the bubble frequency .nu. of the aqueous ink composition being set at more than 5 Hz. In addition, an ink-jet printing method for forming ink images on an image-receiving medium has the step of ejecting the above-mentioned aqueous ink composition in the form of droplets according to the recording signals at a recording frequency of 8 kHz or more.
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Igarashi Masato
Kojima Akio
Konishi Akiko
Koyano Masayuki
Mochizuki Hiroyuki
Bell Mark L.
Faison Veronica F.
Ricoh & Company, Ltd.
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