Incremental printing of symbolic information – Ink jet – Fluid or fluid source handling means
Reexamination Certificate
2000-04-18
2001-09-11
Barlow, John (Department: 2853)
Incremental printing of symbolic information
Ink jet
Fluid or fluid source handling means
C347S101000, C347S102000, C347S096000
Reexamination Certificate
active
06286953
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an ink jet recording method. More particularly, the present invention relates to an ink jet recording method wherein a reaction solution and an ink composition are deposited onto a recording medium.
2. Background Art
An ink jet recording method is a printing method wherein droplets of an ink composition are ejected and deposited onto a recording medium such as paper. This method has a feature that an image having a high resolution and a high quality can be realized at a high speed with a relatively inexpensive apparatus. In general, the ink composition used in the ink jet recording method comprises water as a main component and, added thereto, a colorant and a wetting agent such as glycerin added for prevention of clogging and other purposes.
On the other hand, a new ink jet recording method has been recently proposed. The new method comprises applying a polyvalent metal salt solution onto a recording medium and then applying an ink composition containing a dye having at least one carboxyl group (e.g., Japanese Patent Laid-Open No. 202328/1993). According to this method, polyvalent metal ions combine with the dye to form an insoluble composite which can provide an image having water resistance and a high quality free from color bleeding.
Further, an ink jet recording method has been proposed wherein a color ink containing at least a surfactant or a penetrable solvent and a salt for imparting a penetrating property is used in combination with a black ink which cooperates with the salt to cause thickening or coagulation, thereby providing a high-quality color image having a high image density and free from color bleeding (Japanese Patent Laid-Open No. 106735/1994). More specifically, in this method, two liquids, i.e., a first liquid containing a salt and a second liquid of an ink composition, are printed to provide a good image.
Furthermore, other ink jet recording methods wherein two liquids are printed have been proposed, for example, in Japanese Patent Laid-Open No. 240557/1991 and No. 240558/1991.
SUMMARY OF THE INVENTION
The present inventors have now found that, in the above ink jet recording method wherein two liquids are printed, the use of a specific reaction solution in combination with a particular ink composition can provide a good print. The present invention has been made based on such finding.
Accordingly, an object of the present invention is to provide a good image by using an ink jet recording method wherein two liquids are printed.
The first aspect of the present invention provides an ink jet recording method comprising the step of depositing a reaction solution and an ink composition onto a recording medium, wherein the reaction solution comprises a polyvalent metal salt, and wherein the ink composition comprises a pigment and a resin emulsion.
The second aspect of the present invention provides an ink jet recording method comprising the step of depositing a reaction solution and an ink composition onto a recording medium,
wherein the reaction solution comprises a polyallylamine or a derivative thereof, and
wherein the ink composition comprises a colorant and a resin emulsion.
The third aspect of the present invention provides an ink jet recording method comprising the step of depositing a reaction solution and an ink composition onto a recording medium,
wherein the reaction solution comprising a polyvalent metal salt, and
wherein the ink composition comprises a colorant and an alginic acid derivative.
The forth aspect of the present invention provides an ink jet recording method comprising the step of depositing a reaction solution and an ink composition onto a recording medium, wherein the reaction solution comprises a polyvalent metal salt and a polyol having a vapor pressure of not more than 0. 01 mmHg at 20° C., wherein the content of the polyol is such that the weight ratio of the polyol to the polyvalent metal salt is 1 or more, and
wherein the ink composition comprises a colorant and a resin emulsion.
The fifth aspect of the present invention provides an ink jet recording method comprising the step of depositing a reaction solution and an ink composition onto a recording medium,
wherein the polyvalent metal salt is composed of nitric acid ion or a salt of carboxylic acid ion and polyvalent metal ion.
The sixth aspect of the present invention provides an ink jet recording method comprising the step of depositing a reaction solution and an ink composition onto a recording medium,
wherein the reaction solution comprises a polyvalent metal salt and has a surface tension of not more than 35 mN/m, and
wherein the ink composition comprises a colorant and has a surface tension of not more than 40 to 55 mN/m.
The seventh aspect of the present invention provides an ink jet recording method comprising the step of depositing a reaction solution and an ink composition onto a recording medium,
wherein the reaction solution comprises a polyvalent metal salt, and
wherein the ink composition comprising a colorant, water, and an emulsion of a thermoplastic resin,
the method further comprising the step of heating the recording medium with the ink composition deposited thereon to the softening temperature of the thermoplastic resin or a higher temperature.
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Kubota Kazuhide
Sano Yukari
Takemoto Kiyohiko
Watanabe Kazuaki
Barlow John
Ladas and Parry
Seiko Epson Corporation
Shah M
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