Stock material or miscellaneous articles – Ink jet stock for printing – Plural ink receptive layers
Reexamination Certificate
2000-11-15
2003-09-09
Hess, Bruce H. (Department: 1774)
Stock material or miscellaneous articles
Ink jet stock for printing
Plural ink receptive layers
C428S032300
Reexamination Certificate
active
06616991
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an ink jet recording material for a non-aqueous ink used in a printer or plotter employing an ink jet recording system using a non-aqueous ink. Particularly, the present invention relates to an ink jet recording material for a non-aqueous ink, which contains a petroleum high boiling solvent and is excellent in an ink-absorbing property and a fixing property of the non-aqueous ink.
2. Prior Art
Heretofore, an aqueous ink, i.e. an ink having a coloring agent such as a dye or a pigment dispersed or dissolved in water or a mixture solvent of water and a hydrophilic solvent, was used in ink jet recording.
However, the ink jet recording using an aqueous ink caused various problems since a printed part of the recording material extended by absorbing a solvent in the ink. The extension of the recording material was caused since hydrogen bonds between fibers maintaining a mechanical strength of a support were cut by the solvent in the aqueous ink, particularly water, and the extension of the recording material not only provided a bad influence on conveyance of the recording material within a printer but also degraded an accuracy of a relative position between the recording material and a print head, thereby causing unpreferable phenomena including a degradation of a size accuracy of a drawing obtained therefrom and unevenness of an image.
In order to solve these problems, JP-A-57-10660, JP-A-57-10661, JP-A-5-202324 and JP-A-5-331397 propose to use an ink having a coloring agent dissolved or dispersed in a non-aqueous solvent such as an isoparaffinic hydrocarbon. According to these inventions, a recorded material does not extend, and it is possible to carry out ink jet recording with a high size accuracy and without producing uneven images. Also, a non-aqueous solvent is characterized by having a low viscosity and a low surface tension, and it is therefore possible for the non-aqueous solvent to carry out a very high speed ink jet recording by raising a driving frequency of a print head as compared with an ink jet recording using an aqueous ink.
As a recording material used in an ink jet recording employing such a non-aqueous ink, JP-A-64-24785 discloses a recording material comprising an oil-absorbing inorganic pigment, an organic pigment and an aqueous adhesive, and JP-A-1-255580 discloses a recording material comprising silica and an adhesive. These recording materials have a recording surface of mat appearance, and are a mat coat type recording material.
On the other hand, in accordance with recent improvement of an ink jet printer, it has become possible to obtain a highly precise image comparable to a silver salt photograph. Thus, an ink jet recording material having a quality similar to silver salt photograph printing, i.e. having a satisfactory glossy surface, is demanded. As a matter of fact, these recording materials are required to have not only a satisfactory gloss but also a high recorded image density and a high precision of a recorded image. That is, they are required to have a smooth periphery around each dot and a clear outline, and also required not to cause cissing or flowing of an ink, and further required to have an excellent preservability of an image, i.e. a high fixing property of a coloring agent.
In order to satisfy these requirements, with regard to ink jet recording using an aqueous ink, JP-A-63-265680 and JP-A-5-59694 propose an ink jet recording material having a coating layer provided by cast coat method. Also, JP-A-6-155892 discloses a recording material having a film of a water-soluble polymer such as polyvinyl alcohol formed on a similar recording material. Further, JP-A-6-199035 discloses a recording material having an ink-receiving layer comprising pseudoboehmite provided on a support. According to these inventions, an ink jet recording material having a high gloss and a high absorptivity of an aqueous ink is provided. However, when these recording materials are used for recording a non-aqueous ink, a distribution of a coloring agent in a recording material becomes uneven and therefore there are provided various defects of producing a low image density, causing cissing of an ink on the surface of a recording material, thereby to produce uneven images and causing falling off of a coloring agent in the printed part even by a slight friction since there is no affinity between a material for forming a recording material and a coloring agent or a solvent contained in an ink. Thus, when a non-aqueous ink was printed on these recording material, it was quite impossible to obtain a satisfactory recorded image having a high density, a high precision and an excellent preservability.
As a recording material to be used in ink jet recording employing a non-aqueous ink for solving these problems, JP-A-10-250218 discloses a recording material providing a satisfactory recorded image of high precision and a satisfactory fixing property of a coloring agent by incorporating a polymer soluble in an isoparaffinic hydrocarbon into a coating layer. The polymer soluble in the isoparaffinic hydrocarbon contained in the coating layer is dissolved in a solvent in the ink after printing and traps a coloring agent therein. Thereafter, the solvent loses fluidity by drying, and fixes the coloring agent therein, thereby enabling to make the coloring agent uniformly distribute in the inside of the recording material, to improve a density and a precision, and also to improve a fixing property of the coloring agent to the recording material. However, depending on a type of an ink used for printing, there was a fear of producing a difference in a fixing property of a coloring agent to a recording material due to a difference in an affinity to an ink.
Thus, an object of the present invention is to provide an ink jet recording material for a non-aqueous ink used in a printer or plotter employing an ink jet recording system, characterized by having a satisfactory fixing property and a satisfactory ink-absorbing property of the non-aqueous ink and also having a satisfactory long term preservability of a white paper part (resistance to yellow coloration).
The objection of the present invention can be achieved by providing the following means.
SUMMARY OF THE INVENTION
The present invention provides an ink jet recording material for a non-aqueous ink, having a satisfactory fixing property of the non-aqueous ink and a satisfactory ink-absorbing property, which comprises an ink-receiving layer formed on a support, the ink-receiving layer containing a polymer soluble or swellable in a petroleum high boiling solvent, wherein the polymer is a liquid rubber.
Also, the present invention provides a glossy ink jet recording material for a non-aqueous ink, having a satisfactory fixing property of the non-aqueous ink and a satisfactory ink-absorbing property, wherein the outermost layer of an ink-receiving layer is a gloss-developing layer.
The non-aqueous ink-absorbing property and the fixing property of the ink jet recording material for a non-aqueous ink are more improved by employing a liquid polyisoprene or a liquid polyisobutylene as the rubber contained in the ink-receiving layer.
Also, the non-aqueous ink-absorbing property, fixing property and preservability of a white paper portion of the ink jet recording material for a non-aqueous ink are further improved by employing a hydrogenated liquid polyisoprene as the liquid rubber contained in the ink-receiving layer.
Also, it is preferable to impregnate an ink-receiving layer with a solution of a liquid rubber by coating the solution on the ink-receiving layer. By concentrating the liquid rubber on the surface part of a recording material, an effect archived by incorporating the liquid rubber is more improved.
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention is further described in more details by referring to preferable embodiments.
According to the present invention, an ink jet recording material for a non-aqueous ink is an ink jet recor
Hess Bruce H.
Mitsubishi Paper Mills Limited
Shewareqed B.
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