Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Reexamination Certificate
2002-12-02
2004-03-30
Jones, Deborah (Department: 1775)
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
C428S219000, C428S331000, C428S323000, C428S339000, C428S329000, C428S402000, C428S446000, C428S474400, C428S477700, C428S500000, C428S689000, C428S704000, C428S913000
Reexamination Certificate
active
06713160
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an ink jet recording material. More particularly, the present invention relates to an ink jet recording material capable of enhancing the light fastness of ink images recorded thereon.
2. Description of the Related Art
An ink jet recording system, in which an aqueous ink is jetted imagewise through a fine opening of a jetting nozzle toward a recording material to form ink images, is advantageous in that printing noise is low, full colored images can be easily recorded, the recording can be effected at a high speed, and the ink jet printer is cheaper than other printers and, thus, the application of the ink jet recording system has progressed in many fields including, for example, terminal printers for computers, facsimile machines, plotters, and book and slip printers.
Currently, as the use of the ink jet printer has been rapidly expanded and the quality of the printed images has been improved, the ink jet recording material is strongly required not only to have a good appearance but also to be capable of imparting a high stability to the ink images recorded thereon, particularly a high resistance of the recorded ink images to light. However, as the inks for the ink jet recording system must satisfy requirements of not blocking the ink jet nozzle and of having a brilliant hue, the inks are not always selected from pigment inks and dye inks having a high light fastness.
To solve the above-mentioned problems, a plurality of attempts for enhancing the light fastness of ink images printed on the ink-jet recording material by adding various resistance-enhancing materials to the recording material have been made. For example, Japanese Unexamined Patent Publication No. 57-87,988 discloses an ink jet recording sheet containing, as at least one component, an ultraviolet ray-absorbing agent. Japanese Unexamined Patent Publication No. 61-146,591 discloses an ink jet recording medium usable for recording images thereon by using an aqueous ink containing a water-soluble dye, characterized by containing therein a hindered amine compound. Japanese Unexamined Patent Publication No. 4-201,594 discloses a recording material comprising a base material and an ink receiving layer formed on the base material and characterized in that the ink receiving layer contains super fine particles of transition metal compounds. The above-mentioned recording materials exhibit, to a certain extent, a light fastness-enhancing effect for the ink images recorded thereon. However, they are disadvantageous in that the recording materials exhibit a poor ink-absorbing property, the light fastness-enhancing effect is insufficient in practice and, after fading, the faded colors are badly balanced.
Also, Japanese Unexamined Patent Publication No. 61-57,380 discloses an ink jet recording medium for recording thereon ink images formed by using an aqueous ink containing a water-soluble dye, characterized in that the recording medium contains a porous inorganic pigment, a cationic resin and a magnesium compound having a very poor water solubility. Japanese Unexamined Patent Publication No. 57-87,987 discloses an ink jet recording sheet for recording thereon images formed from an ink containing an acid dye or a mordant dye, comprising at least one member selected from molybdic acid and tannic acid and contained in or coated on a base sheet. They can enhance the light fastness of the ink images recorded thereon, but the enhanced light fastness may not be sufficient. However, when the printed sheet is stored for a long time, the light fastness of the recorded ink images is insufficient, and the molybdic acid is unsatisfactory in that, after fading, the color balance is lost and the non-printed portions of the recording sheet become discolored.
Accordingly, an ink jet recording material free from the above-mentioned disadvantages is in strong demand.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an ink jet recording material providing high light fastness to ink images recorded thereon.
The above-mentioned object can be attained by the ink jet recording material of the present invention which comprises a support material and at least one ink receiving layer formed on at least one surface of the support material and comprising a light fastness-enhancing agent for ink images received on the ink receiving layer, an inorganic pigment and a cationic polymeric material,
wherein the light fastness-enhancing agent comprises at least one member selected from the group consisting of hydroquinone-&bgr;-D-glucoside, salts of pyrocatechol-3,5-disulfonic acid and salts of p-hydroxybenzenesulfonic acid, and
the inorganic pigment and the cationic polymeric material are in the form of a plurality of composite particles prepared by mixing an aqueous dispersion of inorganic pigment particles with a cationic polymeric material having a molecular weight of 100,000 or more, to cause the aqueous dispersion of the inorganic pigment particles to be coagulated with the cationic polymeric material, and subjecting the resultant inorganic pigment-cationic polymeric material coagulated particles to pulverization to form inorganic pigment-cationic polymeric material composite particles having an average composite particle size of 10 to 1,000 nm.
In the ink jet recording material of the present invention, the light fastness enhancing agent is preferably present in an amount of 0.3 to 30% by mass based on the mass of the ink receiving layer.
In the ink jet recording material of the present invention, the amount of the light fastness-enhancing agent is preferably 1 to 10% by mass based on the mass of the ink receiving layer.
In the ink jet recording material of the present invention, the salt of pyrocatechol-3,5-disulfonic acid and the salt of p-hydroxy-benzenesulfonic acid are preferably sodium pyrocatechol-3,5-disulfonate and sodium p-hydroxy-benzenesulfonate, respectively.
In the ink jet recording material of the present invention, the inorganic pigment preferably comprises at least one member selected from the group consisting of silica, alumina and aluminosilicate.
In the ink jet recording material of the present invention, the cationic polymeric material preferably comprises at least one member selected from polydiallyldimethyl ammonium chloride, polyacrylamide, polydiallylamine-hdyrochloric acid salt, polyvinylamine, polyalkylenepolyamine-dicyandiamide condensation product, and polymers and copolymers of secondary amine-epichlorohydrin.
In the ink jet recording material of the present invention, a ratio in mass of the inorganic pigment to the cationic polymeric material is preferably 100:1 to 100:50.
In the ink jet recording material of the present invention, the ratio in mass of the inorganic pigment to the cationic material is more preferably in the range of from 100:2 to 100:30.
In the ink jet recording material of the present invention, the inorganic pigment-cationic polymeric material composite particles are preferably present in a content of 70 to 95% by mass in the ink receiving layer.
In the ink jet recording material of the present invention, in the inorganic pigment-cationic polymeric material composite particles contained in the ink receiving layer, the cationic polymeric material is preferably present in an amount of 0.01 to 10 g per m
2
of the surface area of the recording material.
In the ink jet recording material of the present invention, the ink receiving layer is preferably formed on the support material in such a manner that a layer containing the light fastness-enhancing agent and the inorganic pigment-cationic polymeric material composite particles is formed on a casting surface of a casting base, and then is brought into contact with a surface of the support material under pressure so as to transfer the cast layer to the support material surface, and the cast layer on the support material is separated from the casting surface of the casting base.
The ink jet recording material of the present invention, preferably has a
Endo Eriko
Kitamura Ryu
Ohshima Kazuaki
Takahashi Tomomi
Arent Fox Kintner Plotkin & Kahn
Jones Deborah
Oji Paper Co. Ltd.
Xu Ling
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