JP3511225B2 - Recording medium for water-soluble ink - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording paper for water-soluble ink having excellent water resistance, and more specifically, it contains a polyhydric phenol, and is a water-soluble ink with suppressed bleeding due to water. Recording sheet

[0002]

2. Description of the Related Art A printed matter using a water-soluble ink has a bleeding under a high humidity condition and lacks reliability as a recorded matter.

The method of providing an overcoat layer after printing is the most effective method for improving the water resistance of a printed matter using a water-soluble ink, but since the process is complicated and not practical, the water resistance of the ink is improved. Various improvement methods such as a method of adding an agent and a method of adding a water resistance improver to a recording medium have been proposed.

Among the above-mentioned improving methods, the method of adding a water resistance improver to the ink is not practical in the use which is sensitive to the viscosity and deposits of the ink such as the ink jet recording method, and is disclosed in JP-B-8-9706. It was necessary to sacrifice some performance and color tone selectivity, such as a limited combination of dyes as proposed in the publication. On the other hand, as a method for adding a water resistance improver to a recording material, there is disclosed in JP-A-59-2.
In 0696, it is proposed to use a polymer of dimethyldiallylammonium chloride as a fixing agent,
Further, Japanese Patent Publication No. 3-2072 proposes a combined use of a polymer of dimethyldiallylammonium chloride and polyethyleneimine, and further, Japanese Patent Publication Nos. 5-71393, 6-92190 and 7-4.
In Japanese Patent No. 963, it is proposed to coat or impregnate a recording medium with a cationic polymer as a fixing agent, but with these methods, an effect of improving water resistance is recognized, but it is not yet satisfactory. .

Therefore, an object of the present invention is to provide a recording paper for water-soluble ink which is excellent in water resistance.

[0006]

As a result of intensive studies, the inventors of the present invention have found that the above object can be achieved by coating or impregnating a recording paper with a specific polyhydric phenol. .

The present invention has been made on the basis of the above-mentioned findings, and comprises 1,1,3-tris (5-cyclohexyl-4-hyde).
Droxy-2-methylphenyl) butane or 1,1,3
-Tris (5-tert-butyl-4-hydroxy-2-methyl)
A recording paper for water-soluble ink containing ruphenyl) butane .

[0008]

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The recording paper for water-soluble ink of the present invention will be described in detail below. In the following, when referring to a recording body
Means recording paper.

[0010]

[0011]

[0012]

[0013]

The recording paper for water-soluble ink of the present invention contains
That is a polyhydric phenol 1,1,3-tris (4-hydroxy-2-methyl-5-cyclohexyl-phenyl)
Butane, or less, have gutter "DH-43", 1,1,3
Tris (5-tert-butyl-4-hydroxy-2-methylphenyl) butane is hereinafter referred to as "DH-37" .

The content of the polyhydric phenols is preferably 0.1 to 100 g, more preferably 0.5 to 20 g per 1 m ² of the recording material. If the content of the polyhydric phenol is less than 0.1 g, the effect of improving the water resistance cannot be obtained, and if it exceeds 100 g, the water resistance is hardly improved and the appearance of the surface of the recording material may be impaired.

In the water-soluble ink recording material of the present invention, it is preferable to use a cationic polymer in addition to the above-mentioned polyhydric phenols.
2 ] (same as [Chemical Formula 1 ] above) is more preferably used in combination with a cationic polymer comprising a polymer having a repeating unit represented by the general formula ( I ).

[0017]

[Chemical 2]

In the general formula ( I ), examples of the halogen atom represented by X include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.

The cationic polymer used in combination with the water-soluble ink recording material of the present invention is a cationic surfactant having a polymerizable functional group and / or a polymer of a polymerizable cationic monomer, or A copolymer of a polymerizable cationic monomer and another monomer copolymerizable with the polymerizable cationic monomer is used.

The cationic surfactant having a polymerizable functional group is, for example, a quaternary ammonium salt having a hydrocarbon group having 4 to 28 carbon atoms represented by diallyldimethylammonium chloride or the like. Acrylic acid- or methacrylic acid-based cationic surfactants having good polymerizability such as dimethylaminoethylmethacrylate hydrochloride polymer may be mentioned. Further, as the polymer of the above-mentioned polymerizable cationic monomer, polyethylene may be used. Examples thereof include imines and the like, and examples of the other copolymerizable monomers include monomers having good polymerizability such as acrylamide.

The degree of polymerization of the above cationic polymer is not particularly limited, but is preferably in the range of 20 to 20,000. When the degree of polymerization of the cationic polymer is less than 20, the fixing power of the cationic polymer itself on the substrate is poor, and
When it exceeds 000, when it is applied to a substrate as an aqueous solution, the viscosity becomes high and handling may be inconvenient.

The recording paper for water-soluble ink of the present invention is made of paper as a base material, and a papermaking process for making paper is applied to the base material, and if necessary, a pigment coating layer is formed on the base material. Is provided.

Paper is used as the above-mentioned base material constituting the recording paper for water-soluble ink of the present invention. In addition to pulp obtained from natural wood , paper obtained from synthetic polymer fiber, synthetic pulp, etc. is used. .

To make the paper as the base material, it is preferable to internally add a white pigment. As the white pigment,
Light calcium carbonate such as calcite, fine particle silica,
Calcium bicarbonate, zeolite, kaolin clay, talc, diatomaceous earth, aluminum hydroxide, titanium dioxide,
Examples include organic pigments.

In addition, when the paper as the above-mentioned substrate is made, if necessary, paper strength enhancers, retention aids, wet paper strength enhancers and dyes, which are additives generally used for paper making, are used. Etc. can also be used together.

Further, the paper as the base material subjected to the paper making step may be used as it is, or may be subjected to the coating step for providing a pigment coating layer. The coating layer is usually 1 to
It is formed with a coating amount of 25 g / m ² . Examples of the pigment used in the coating layer include light and heavy calcium carbonate, Zeorex, kaolin clay, talc, diatomaceous earth, aluminum hydroxide, titanium dioxide and organic pigments.

The method for applying the polyhydric phenol in the water-soluble ink recording material of the present invention is as follows: the method of adding in the paper making step, the method of adding in the coating step, the method after the paper making step or the step after the coating step. Any method of coating or impregnating with a water dispersion may be used.

The recording material of the present invention is for a water-soluble ink, and applicable water-soluble inks include acid dyes, direct dyes and basic dyes. In particular, acid dyes and direct dyes, when used in combination with the cationic polymer,
It is preferable because a fixing effect can be obtained.

[0029]

EXAMPLES Next, the present invention will be described more specifically by way of examples, but the present invention is not limited to the following examples.

Example 1 20 g of polyhydric phenols shown in the following [Table 1] was added to 20 g of a 10% by weight aqueous solution of polyvinyl alcohol, 2 g of a 10% by weight aqueous solution of sodium di-2-ethylhexyl sulfosuccinate in 2 g and 83 g of water in a bead crusher. Using the above, the polyhydric phenol was pulverized to 1 μm or less to obtain a dispersion A.

Further, the cationic polymer shown in the following [Table 1] was diluted with water to obtain a 16% aqueous solution to obtain an aqueous solution B.

A treatment liquid obtained by stirring and mixing 10 g of the dispersion liquid A and 10 g of the aqueous solution B was applied to plain paper at 5 g / m ² , dried, and then supercalendered to give a test paper.

An ink jet printer (MACHJET MJ-700 manufactured by Epson Corp.) was used for the obtained test paper.
V2C) was used to print each of the three colors of cyan, magenta, and yellow in a striped pattern having a width of 3 mm.

The printed test paper is dipped in water for 1 minute to give 1 without bleeding, 2 with slight bleeding, and 3 with bleeding but no bleeding overlap on each line. The water resistance was evaluated as 4, where the overlap of bleeding occurred and 5 when the bleeding did not reveal the striped pattern. The results are shown in [Table 1] below.

[0035]

[Table 1]

Example 2 Evaluations were made in the same manner as in Example 1 except that plain paper was changed to coated paper. The results are shown in [Table 2] below.

[0037]

[Table 2]

From the above results, it is clear that the water-soluble ink recording materials of the present invention (Examples 1-1 to 1-5, 2-1 to 2-5) have excellent water resistance.

[0039]

The recording material for water-soluble ink of the present invention is excellent in water resistance because it contains a specific polyhydric phenol. Further, the recording material for water-soluble ink of the present invention,
Further, by using a cationic polymer together, the water resistance becomes particularly excellent.

Front Page Continuation (72) Inventor Hiromi Kimura 5-2-13 Shirahata, Urawa-shi, Saitama Asahi Denka Kogyo Co., Ltd. (56) References JP-A-60-72785 (JP, A) JP-A-57- 87989 (JP, A) JP 1-95091 (JP, A) JP 59-20696 (JP, A) JP 3-2072 (JP, B2) JP 5-71393 (JP, B2) Japanese Patent Publication No. 6-92190 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) D21H 11/00-27/42 B41M 5/00-5/10

Claims (3)

(57) [Claims] 1. 1,1,3-Tris (5-cyclohexyl)
Lu-4-hydroxy-2-methylphenyl) butane or
1,1,3-tris (5-tert-butyl-4-hydroxy)
Recording paper for water-soluble ink containing 2-methylphenyl) butane . 2. The recording paper for water-soluble ink according to claim 1, further comprising a cationic polymer. 3. The above-mentioned cationic polymer is represented by the following [Chemical formula 1 ]
The recording paper for water-soluble ink according to claim 2, comprising a polymer having a repeating unit represented by the general formula ( I ). [Chemical 1]