Compositions: coating or plastic – Coating or plastic compositions – Marking
Reexamination Certificate
2001-01-25
2004-04-13
Klemanski, Helene (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Marking
C347S100000, C283S045000, C544S188000, C546S076000
Reexamination Certificate
active
06719833
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a recording medium exhibiting both outstanding ink absorbency and outstanding image light resistance, and to an image forming method and a recorded matter in which that recording medium is used.
2. Description of the Related Art
Conventionally, using recording liquids containing dyes or other colorants, recording media exhibiting outstanding recording liquid absorbency and recording media for forming image exhibiting outstanding light resistance have been developed.
An example of such a recording medium is disclosed ad in Japanese Patent Application Laid-Open No. S61-146591/1986, for example, which in an ink jet recording medium for forming recorded images using a water-soluble ink containing a water-soluble dye, and which contains a hindered amine compound, with the object of providing a recording medium that exhibits improved resistance to discoloration and light resistance, particularly for water-soluble black dyes and/or water-soluble magenta dyes.
Also, in Japanese Patent Application Laid-Open No. H3-13376/1991, a recording material having a layer wherein a pigment is the main component in the surface layer of a base material, containing in that layer a hindered phenol compound and a hindered amine compound in a specific weight ratio, and an ink jet recording method performed by deploying droplets of a recording liquid containing a water-soluble dye to that recording material are disclosed, with the object of providing a recording material that exhibits outstanding ink absorbency and dye color producing properties, wherewith high-quality and high-resolution images can be obtained, and of providing a recording material that gives recorded images exhibiting good recorded image preserving properties and little deterioration, particularly deterioration caused by room discoloration, together with a recording method for forming such images.
In Japanese Patent Application Laid-Open Nu. E7-314882/1995, furthermore, a sheet is disclosed that has a porous ink receiving layer containing a hindered amine compound on a base material, with the object of obtaining recording sheets exhibiting good ink absorbency, good color fixation, and little fading even when stored for an extended period after printing The Japanese Patent Application Laid-Open No. H9-216917/1997, moreover, an ink jet recording paper is disclosed wherewith a coating liquid containing a copolymer or polymer formed using a specific hindered amino compound is coated on or impregnated in the recording paper, with the object of providing a suitable material for use as an additive to coating liquids for ink jet recording paper.
However, with the recording media containing hindered amine compounds and the recording methods described in these publications, satisfactory ink absorbency and image light resistance arc still not obtained. In these publications, furthermore, while there is description Or having hindered amine compounds contained in the recording media, there is no description either of the solubility in water of hindered amine compounds or of the effectiveness of using certain dyes in recording liquids.
In particular, with a recording medium containing a hindered amine compound that is highly soluble in water, during image recording using a recording liquid, that hindered amine compound is dissolved by the water contained in the recording liquid and penetrates into the interior of the recording medium. For that reason, that hindered amine compound cannot be made to be present in the vicinity of dyes or other colorants in the images obtained, and effectiveness in improving light resistance is not demonstrated when that hindered amine compound is used. With a recording medium containing a hindered amine compound that exhibits very low solubility in water, and that hardly dissolves at all in water, on the other hand, although effectiveness in improving light resistance is demonstrated, the ink absorbency of the ink receiving layer during the recording of images using the recording liquid deteriorates, and satisfactory images are not obtained.
SUMMARY OF THE INVENTION
That being so, an object of the present invention is to provide a recording medium exhibiting both outstanding ink absorbency and outstanding light resistance of images, and an image forming method and a recorded matter using that recording medium.
As a result of extensive and assiduous research, the inventors arrived at the present invention after discovering that, by using a hindered amine compound having a specific solubility in water, that hindered amine compound can be made to be present in the vicinity of dye in an image recorded without lowering ink absorbency, so that the object noted above can be attained, even in cases where that hindered amine compound is used in small quantities.
More specifically, the present invention provides a recording medium comprising a supporting body and an ink receiving layer deployed on that supporting body, wherein the ink receiving layer contains a compound expressed by the general formula (I) indicated below and exhibiting a solubility in water of 0.01 to 5%.
(where X represents a hydrogen atom, or an alkyl, aryl group, alkenyl, acyl, sulfonyl, sulfinyl, alkoxy, or acyloxy group, which may or may not have a substituent; R
1
to R
4
represents respectively and independently a hydrogen atom or an alkyl group; and Y represents a hydroxyl, carboxyl, alkyl, amino, alkenyl, alkoxy, aryl, alkyl carbonyloxy, alkenylcarbonyloxy, arylcarbonyloxy, aminocarbonyloxy, alkoxyalkyl, aralkyl, alkylcarbonyloxy, alkylsulfonylamino, alkylaminocarbonyl, aralkyloxycarbo, alkoxycarbonyl group, or alkylaminosulfonyl group, which groups may or may not have a substituent. Also, it is possible for Y to be a polymer, and the compound expressed by formula (I) can be a polymer having X and Y are main chains.)
The present invention also provides an image forming method for forming images on the recording medium noted above using a recording liquid containing a compound represented by the general formula (II) given below.
where X is an anilino group substituded for with at least one SO
3
M, Y is OH, Cl, or a morpholino group, and M is H, Li, Na, K, ammonium or an organic amine.
The present invention also provides a recorded matter in which an image is formed using a recording liquid containing a compound represented by the general formula (II) given below.
where X is an anilino group substituded with at least one SO
3
M, Y is OH, Cl, or a morpholino group, and M is H, Li, Na, K, ammonium , or an organic amine.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A detailed description is now given of the recording medium of the present invention.
The recording medium of the present invention Comprises a supporting body and an ink receiving layer deployed on that supporting body In that ink receiving layer is contained a hindered amine compound that is expressed by the general formula (I) given below, and which exhibits a solubility in water of 0.01 to 5% (hereinafter called “specific solubility hindered amine compound”). When “solubility” is simply mentioned in this specification, the solubility in water is intended.
(wherein: X represents a hydrogen atom, or an alkyl, aryl, alkenyl, acyl, sulfonyl, sulfonyl, alkoxy or acyloxy group, which may or may not have a substituent; R
1
to R
4
represents respectively and independently a hydrogen atom or an alkyl group; and Y represents a hydroxyl, carboxyl, alkyl, amino, alkenyl, alkoxy, aryl, alkylcarbonyloxy, alkenylcarbonyloxy, arylcarbonyloxy, aminocarbonyloxy, alkoxyalkyl, aralkyl, alkylaminocarbonyl, alkylsulfonylamino, alkylaminocarbonyl, aralkyloxycarbonyl, alkoxycarbonyl, or alkylaminosulfonyl group, which may or may not have a substituent. Also, it is possible for Y to be a polymer, and the compound expressed by formula (I) can be a polymer having X and Y as main chains.)
By causing this specific solubility hindered amine compound to be contained in the ink receiving layer, it can be suppressed that the hindered amine c
Hanmura Masahiro
Hayashi Hiroko
Kanaya Miharu
Onishi Hiroyuki
Klemanski Helene
Ladas & Parry
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