EMULSION INK FOR STENCIL PRINTING

PROBLEM TO BE SOLVED: To obtain an emulsion ink which is made proof against bulging and bleeding and can give a clear printed image without paper flying (curl-up) and ink offset, wherein a specified proportion of the oil used in the oil phase is one having a specified surface tension. SOLUTION: An e...

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Bibliographische Detailangaben
Hauptverfasser:	TATEISHI HIROSHI, HIGETA SHIGERU, KOIKE MASAHIRO, UEDA HITOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COLOUR PRINTING CORRECTING FLUIDS DYES FILLING PASTES INKS LINING MACHINES METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PERFORMING OPERATIONS POLISHES PRINTING PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES STAMPS TRANSPORTING TYPEWRITERS USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain an emulsion ink which is made proof against bulging and bleeding and can give a clear printed image without paper flying (curl-up) and ink offset, wherein a specified proportion of the oil used in the oil phase is one having a specified surface tension. SOLUTION: An emulsion ink for stencil printing is provided which has an oil phase in which a colorant, a emulsifier, and a water phase are dispersed and in which the oil phase comprises at least 20 wt.% oil having a surface tension of at most 25 dyn/cm. The oil component in the oil phase may be a mineral oil, a vegetable oil, or the like. In order to improve the long-term stability of the emulsion ink and to better the adhesion of the ink to paper, it is possible to add a suitable amount of a resin to the ink. The colorant used is exemplified by an organic or inorganic pigment. The emulsifier is used to prepare a highly stable emulsion and is desirably a nonionic surfactant alone or a combination of at least two nonionic surfactants of different HLBs.