Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Reexamination Certificate
1998-09-11
2001-08-07
Schwartz, Pamela R. (Department: 1774)
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
C428S195100, C428S328000, C428S329000, C428S537500
Reexamination Certificate
active
06270881
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to recording media for ink-jet using kenaf paper as a substrate, and particularly to recording media for ink-jet, which can provide images having excellent water fastness.
2. Related Background Art
An ink-jet recording system is a system wherein minute droplets of an ink are ejected by any one of various working principles to apply them to a recording medium such as paper, thereby making a record of images, characters and/or the like, and is being quickly spread in various applications, for example, recording of various graphics including characters, and color images, and so on, because it has features that recording can be conducted at high speed and with a low noise, color images can be formed with ease, recording patterns are very flexible, and developing and fixing treatment are unnecessary.
Recording media used for such a recording system have come to be required to provide images having good water fastness in addition to ink absorption at high speed, high ink absorbing capacity, and the provision of images high in optical density and improved in image quality.
In order to satisfy such requirements, Japanese Patent Application Laid-Open No. 55-51583 discloses that a coating layer composed of amorphous silica and a polymer binder has good ink absorbency in printing with water-based inks and is hence suitable for use in high-density printing. With respect to recording media for ink-jet, which can provide images having good water fastness, the use of modified polyvinyl alcohol containing a silyl group is disclosed in Japanese Patent Application Laid-Open No. 10 61-134290, the use of a polycationic polymeric electrolyte in Japanese Patent Application Laid-Open No. 56-84992, a method of using a polyvalent metal salt in Japanese Patent Application Laid-Open No. 56-86789, a method of using at least one water-soluble metal salt having a divalent or still higher ionic valence and a cationic organic substance in Japanese Patent Application Laid-Open No. 60-67190, and a method of using silanol group-containing polyvinyl alcohol and a zirconium compound in Japanese Patent Application Laid-Open No. 6-32046. Further, Japanese Patent Application Laid-Open No. 7-1833 discloses a method of using a monoammonium compound as a water-proofing agent.
These known compounds and methods satisfy their intended ends, but still require improvement. From the viewpoint of, for example, improvement in the water fastness of images, it has been known that the addition of a cationic substance permits the improvement of the water fastness due to its ionic bonding to an anionic dye. However, in all the known recording media, they are only evaluated as to optical density by dipping the whole surfaces of prints in water to observe whether inks of the prints are redissolved out in water or not. From the viewpoint of practical use, a case where water is applied to a part of a print often occurs rather than a case where the whole surface of a print is dipped in water. In this case, bleeding at boundaries between a portion with which water has come into contact and a portion in no contact with water becomes a problem. In particular, even when inks are not redissolved out when the whole surface of a print is dipped in water, the bleeding may be observed in some cases when the print is brought into partial contact with water and dried. This is considered to be due to the fact that since penetration of water into a substrate proceeds over a longer period of time in the case of the partial contact with water compared with the case of the dipping in water, the bleeding of the print more markedly appears.
On the other hand, in the case where the coating layer composed of the amorphous silica and the polymer binder is formed on the surface of paper, the resulting recording medium is accompanied by many problems. For example, since the surface of paper is covered with the amorphous silica, the natural hand and feeling of paper is impaired, the surface thereof becomes powdery, and dusting occurs when it is folded or conveyed.
SUMMARY OF THE INVENTION
With the foregoing circumstances in view, it is an object of the present invention to provide a recording medium for ink-jet, which can provide images having good image quality and excellent water fastness by a printer of the ink-jet system, and retains the natural hand and feeling of a paper substrate as it is.
The above object can be achieved by the present invention described below.
According to the present invention, there is thus provided a recording medium for ink-jet, comprising a substrate composed of kenaf paper, and an ink-receiving layer provided on the substrate, wherein the ink-receiving layer comprises an alumina hydrate, a compound represented by the general formula
wherein R
1
, R
2
, R
3
and R
4
are, independently of one another, a substituted or unsubstituted alkyl group, and X
1
−
is an anion of a fluoride, chloride, bromide, iodide, astatide, sulfate, alkoxylsulfate, sulfite, phosphate, phosphite, perchlorate, perbromate, periodate or chlorate, and a compound represented by the general formula
wherein R
5
, R
6
, R
7
and R
8
are, independently of one another, a substituted or unsubstituted alkyl group except that at least one of R
5
, R
6
, R
7
and R
8
is a substituted or unsubstituted aryl or arylalkyl group, and X
1
−
is an anion of a fluoride, chloride, bromide, iodide, astatide, sulfate, alkoxylsulfate, sulfite, phosphate, phosphite, perchlorate, perbromate, periodate or chlorate.
According to the present invention, there is also provided a recording medium for ink-jet, comprising a substrate composed of kenaf paper, and an ink-receiving layer provided on the substrate, wherein the ink-receiving layer comprises an alumina hydrate, benzethonium chloride and a polyallylamine derivative represented by the general formula
wherein X
2
−
is Br
−
, Cl
−
, I
−
, HOSO
3
−
, CH
3
OSO
3
−
or C
2
H
5
OSO
3
−
, and n is an integer of from 5 to 10,000.
According to the present invention, there is further provided a recording medium for ink-jet, comprising a substrate composed of kenaf paper, and an ink-receiving layer provided on the substrate, wherein the ink-receiving layer comprises an alumina hydrate, benzethonium chloride and a compound represented by the general formula
wherein n is an integer of from 10 to 30,000.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The recording media for ink-jet according to the present invention each have an ink-receiving layer, which can provide an image having excellent water fastness, on a substrate composed of kenaf paper.
The kenaf paper is paper which is soft and gives an impression of high grade, and attracts attention at present. For example, Japanese Patent Application Laid-Open Nos. 2-88286 and 2-92576 have proposed, as their objects, that a base paper web for thermal recording paper and pressure sensitive paper is provided by using kenaf pulp in combination with ordinary pulp. Japanese Patent Application Laid-Open No. 6-262868 has proposed, as its object, that paper for receiving thermal transfer printing is provided.
According to the recording media for ink-jet according to the present invention, the quality of an image formed thereon can be enhanced by using kenaf paper as a substrate.
The kenaf paper preferably contains kenaf pulp and wood pulp at a weight ratio of from 50:50 to 100:0.
The thickness and basis weight of the kenaf paper are preferably within ranges of from 10 to 200 &mgr;m and from 10 to 200 g/m
2
, respectively. In order to form an ink-receiving layer which can provide an image having good water fastness, the Stöckigt sizing degree of the kenaf paper is also limited to a suitable range. Namely, the Stöckigt sizing degree is preferably within a range of from 50 seconds to 200 seconds based on the basis weight of 127 g/m
2
.
The ink-receiving layer according to the present invention permits the formation of an image having excellent water fastness when the
Kobayashi Motokazu
Yuasa Toshiya
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Schwartz Pamela R.
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