Recording material

Details Recording material Recording material

2001-03-02

2002-09-24

Kelly, Cynthia H. (Department: 1774)

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

C428S211100, C428S411100, C428S537500

Reexamination Certificate

active

06455137

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a recording material, and more particularly, to a recording material which is especially suitable for use in the ink-jet recording system.
BACKGROUND ART
The recent spread of personal computers not only in enterprises, but also at home has brought about an increase in the printing of information by printers. The recent improvement in performance of personal computers has made it possible to handle image data consisting of a large amount of information very easily and has brought about an increase in the printing of images in full color.
Examples of printing and recording systems by printers include ink-jet recording systems, heat-transfer recording systems, sublimation transfer recording systems and direct heat-sensitive recording systems. All of these systems require a recording material to have characteristics including a high printing density, an excellent color developing property, resistance to blotting during printing, and resistance to ink flow and blotting when the recording material is wetted with water.
For the ink-jet recording systems in which recording is made by spraying fine ink droplets onto a recording material such as paper, it is particularly important to ensure that the ink does not blot the recording material when adhering to it, nor should the ink on the recording material flow or blot with water contact.
Attempts have been made to add various compounds to a recording material to meet the requirements stated above. For example, studies into the addition of various chemicals into a recording material have been made. Such chemicals include polyethyleneimine, a quaternary compound of polyvinyl pyridine disclosed in Japanese Laid-Open Patent Application (JP-A) No. 56-84992, a condensation product of polyalkylenepolyaminedicyandiamide disclosed in Japanese Laid-Open Patent Application (JP-A) No. 60-49990, and a reaction product of a secondary amine and epihalohydrin disclosed in Japanese Laid-Open Patent Application (JP-A) No. 6-92012.
DISCLOSURE OF THE INVENTION
However, a recording material that meets all of the above-stated requirements for the various printing and recording systems is not yet known. Since the ink-jet recording system normally employs the ink containing a water-soluble dye or water-dispersible dye, it is especially difficult to solve the problems of ink blotting during printing, and flowing or blotting of ink on the recording material with water contact after printing, even if a recording material containing the above-mentioned chemicals is used.
In view of these technical problems, it is an object of the present invention to provide a recording material, which is particularly suitable for use in an ink-jet recording system, which does not exhibit blotting of ink during printing and flowing or blotting of ink with water contact after printing.
The inventors have made detailed studies into means for achieving the above-mentioned object and, as a result, have found that the addition of a polyguanidine salt into a substrate makes it possible to obtain a recording material which does not exhibit blotting of ink during printing and flowing or blotting of ink with water contact after printing. The inventors have also found that a recording material comprising a substrate and a polyguanidine salt contained in the substrate is particularly effective in preventing blotting of ink during printing, and flowing or blotting of ink by water contact after printing, when inks for the ink-jet recording system which contain a water-soluble dye or a water-dispersible dye are used, thereby accomplishing the present invention.
Thus, the present invention provides a recording material comprising a substrate and a polyguanidine salt of the general formula (1) contained in the substrate:
wherein R
1
and R
2
may be the same or different, and each represents a group selected from the group consisting of a divalent aliphatic hydrocarbon group, a divalent aromatic hydrocarbon group and a divalent alicyclic hydrocarbon group; HX is an acid selected from the group consisting of a mineral acid and an organic acid; and p is an integer of 1 to 250.
According to the present invention, the polyguanidine salt is preferably a polyguanidine salt of the general formula (2):
wherein HX is an acid selected from the group consisting of a mineral acid and an organic acid; n is an integer of 3 to 500; and m is an integer of 2 to 6.
The present invention also provides a recording material in which the substrate comprises at least one material selected from the group consisting of paper, a fibrous material and a resin film.
The substrate of the recording material of the present invention preferably contains the polyguanidine salt in an amount of 0.01 to 10 g per square meter in the vicinity of its surface. And the recording material preferably contains the polyguanidine salt in an amount of 0.01 to 10% by weight based on a total weight of the recording material.
The present invention further provides a recording material which is suitable for an ink-jet recording system.
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will now be described in detail.
The recording material of the present invention comprises a substrate and a polyguanidine salt of the general formula (1) contained in the substrate:
wherein R
1
and R
2
may be the same or different, and each represents a group selected from the group consisting of a divalent aliphatic hydrocarbon group, a divalent aromatic hydrocarbon group and a divalent alicyclic hydrocarbon group; HX is an acid selected from the group consisting of a mineral acid and an organic acid; and p is an integer of 1 to 250.
Here, the polyguanidine salt means a salt formed from a polyguanidine of the general formula (3) and an acid HX:
wherein R
1
and R
2
may be the same or different, and each represents a group selected from the group consisting of a divalent aliphatic hydrocarbon group, a divalent aromatic hydrocarbon group and a divalent alicyclic hydrocarbon group; and p is an integer of 1 to 250.
HX in the general formula (1) is not particularly limited as long as it is an acid that forms a salt with guanidine. Any of various known mineral or organic acids is preferably used. The mineral acids that can be used include hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid and carbonic acid. The organic acids that can be used include monobasic acids represented by acetic acid, lactic acid and gluconic acid; and polybasic acids represented by maleic acid, fumaric acid and tartaric acid. In the present invention, phosphoric acid, hydrochloric acid and lactic acid are preferably used.
The polyguanidine salt of the general formula (1) can be obtained by, for example, reacting diamine with diisothiocyanate to obtain polythiourea, converting ═S in the thiourea group in the polythiourea into ═NH by an adequate functional group conversion to obtain polyguanidine of the general formula (3), and neutralizing the polyguanidine with an acid HX. Since the polyguanidine salt of the general formula (1) can be obtained by polyaddition as described above, the terminal of its molecule may form amino group (—NH
2
) derived from diamine, isothiocyanate group (—NCS) derived from diisothiocyanate, or a functional group derived by the above-mentioned functional group conversion and/or neutralization.
In general formula (1), p is an integer of 1 to 250. Preferably, p is an integer of 3 to 250. When p exceeds 250, the polyguanidine salt has too high molecular weight for easy handling. R
1
and R
2
are preferably a divalent aliphatic hydrocarbon group, and more preferably a divalent aliphatic hydrocarbon group having 1 to 12 carbons. In this case, R
1
can be different from R
2
. In the present invention, the polyguanidine salt may be used alone or in combination of two or more kinds.
In present invention, the polyguanidine salt of the general formula (1) is preferably a polyguanidine salt of the general formula (2):
wherein HX is an acid selected from the group consisting of a mineral aci

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