JP2000062311A - Information recording paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To deal with an oxidative polymerization type ink and an ultraviolet curing type ink and a heat transfer recording system and an ink jet recording system by a method wherein a specified amount in solid content per one side of a recording layer including a water-soluble polymer and a cationic polymer with a specified cationic density is provided on at least one side of a support. SOLUTION: The cationic density of a cationic polymer compound is preferably 2.0-8.0 meq/g, especially preferably 0.3-7.0 meq/g. If the cationic density is below 2.0 meq/g, an image water resistance at an ink jet recording is not enough in the range of a normal application amount, resulting in making the use in a use application, in which an image retention is very important, such as a bar code impossible. If the cationic density is above 8.0 meq/g, the impairment of an image quality such as the change of coloring properties results in the recording with an ink, in which a dye containing a carboxyl group is included. Further, 0.5-5.0 g/m2 of a recording layer including a water-soluble polymer and the cationic polymer compound is preferably provided on at least on one side of a support.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has printability using oxidative polymerization type or ultraviolet curing type ink, and is compatible with various information recording systems such as thermal transfer recording system, electrophotographic system and ink jet recording system. The present invention relates to a recording paper having excellent character quality and image water resistance in inkjet recording using a water-soluble dye.

[0002]

2. Description of the Related Art Conventional printing papers and label papers are classified into non-coated papers and coated papers, each of which has printability such as surface strength and ink setting property and labelability. In particular, in the field of form printing, in addition to normal multicolor printing, in order to record variable data such as product names and bar codes by electrophotography, materials to which toner transferability and fixing property are added are used. There is.

For example, when a price bill, a product quotation, a price tag, etc. are created using form paper or label paper,
Conventionally, invariant data such as ground patterns and ruled frames are generally printed using oxidation polymerization type or ultraviolet curing type ink, and electrophotographic method or thermal transfer is used to record variable data such as other product name, amount and bar code. Although the recording method has been used, as the high speed printing of the inkjet printer has progressed in recent years and the price has also become low, the inkjet recording method is increasingly used for recording the variable data.

However, when ink jet recording is performed on ordinary foam paper or the like, the image water resistance is insufficient, so that it is used in applications where the information value is lost due to the occurrence of very slight bleeding such as bar codes. It could not be used and there was a limit to the recorded contents.

On the other hand, most of the ink jet recording papers are coated papers using silica or the like, and mainly inks using water-soluble dyes are used, so that ink drying property, character quality and image water resistance are obtained. Various chemicals are used for the purpose of simultaneously giving. For example, for the purpose of imparting image water resistance, JP-A-59-117525 shows an example of an ink jet recording sheet containing a cationic colloidal silica, and JP-A-56-84992 discloses a cationic polymer electrolyte. A method of using is disclosed.

Such coated papers for exclusive use of ink jet recording have high density recording property and image water resistance, but generally have weak surface strength, and foams using oxidation polymerization type or ultraviolet curing type ink. In printing, there is a problem that the coating layer is taken off by the plate due to the tack of the ink and white spots are generated in the printed image, so that a good printed matter cannot be obtained.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording sheet which is capable of printing using an oxidation polymerization type or ultraviolet curing type ink and which is compatible with a thermal transfer recording system and an ink jet recording system. And

[0008]

The above objects of the present invention are as follows.
A recording layer containing a cationic polymer compound having a cation density of 2.0 to 8.0 meq / g together with a water-soluble polymer on at least one surface of a support comprising a recording paper and at least a filler and a pulp for papermaking is 0.5 g / m in solid content per one surface. ^{2 to} 5.0 g / m ² was achieved.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The cation density in the present invention means
As a titrant, (1/400) N polyvinyl potassium sulfate (PV
SK) solution and a 0.1% toluidine blue solution as an indicator, measured by a general colloid titration method,
It is a value obtained by the following calculation formula.

[0010]

[Equation 1]

The cationic polymer compound in the present invention preferably has a cation density of 2.0 to 8.0 meq / g, and more preferably a cation density of 3.0 to 7.0 meq / g. If the cation density is less than 2.0 meq / g, the image water resistance when inkjet recording is insufficient within the above coating amount range, and it cannot be used for applications where image retention is very important such as barcodes. Conversely, the cation density is 8.0meq
When the amount exceeds / g, recording with an ink using a dye containing a carboxyl group causes problems such as a change in color development, a decrease in recording density, and uneven recording in a solid portion, which impairs image quality.

Examples of the cationic polymer compound include dicyandiamide / alkylamine polymer compounds, dicyandiamide / formalin polymer compounds, polyethyleneimine derivatives, alkylamine / epichlorohydrin polymer compounds, and ammonia / epichlorohydrin polymer compounds. Commercially available chemicals such as polymethacrylic acid-based quaternary ammonium salt derivatives and polydiallyldimethylammonium chloride can be used, but it is particularly preferable to use a polycondensation copolymer composed of two or more kinds of monomers. Such a cationic polymer compound can be used in an appropriate amount within the scope of the present invention.

The type of the water-soluble polymer used in the present invention is not particularly limited as long as it has a strong adhesive force with the base paper and does not cause blocking when the papers are stacked. Examples of such water-soluble polymers include starches such as oxidized starch, esterified starch, enzyme-modified starch, cationized starch, polyvinyl alcohol and its derivatives, casein, soybean proteins, carboxymethylcellulose, hydroxyethylcellulose. Examples include cellulose derivatives such as sucrose.

If necessary, for example, styrene-acrylic resin, isobutylene-maleic anhydride resin, acrylic emulsion, vinyl acetate emulsion, vinylidene chloride emulsion, polyester emulsion, styrene-
Water-dispersible resins such as butadiene latex and acrylonitrile-butadiene latex, as well as defoaming agents, surface sizing agents, water-resistant polymer water-proofing agents, pH adjusters, dyes for adjusting hue, colored pigments, fluorescent dyes Etc. can be used together in an appropriate amount within a range that does not impair the effects of the present invention.

[0015] The recording sheet, it is preferable to provide 0.5g / m ² ~5.0g / m ² the recording layer comprising at least one surface in a water-soluble polymer and a cationic polymer compound of the support,
In particular, it is more preferable to provide ^{1.0g / m 2 ~3.0g / m 2} .

When the recording layer is less than 0.5 g / m ² , the surface strength of the recording layer surface of the paper is weak when printing is performed using an oxidation polymerization type or ultraviolet curing type ink, etc. The filler and pulp fibers in the body are taken up by the ink and are deposited on the plate, the ink kneading roll, etc., and white spots are generated in the image area of the printed matter. Further, when ink jet recording is performed on such a paper, the recording density is low, and problems such as ink bleeding along the filler and pulp fibers in the support exposed on the surface layer occur. On the other hand, the recording layer is 5.0g / m
^If more than ² is provided, not only is it uneconomical, but it is not suitable for high-speed printing because of poor color development and ink dryness in ink jet recording.

Further, the total amount of the cationic polymer compound compounded in the recording layer is preferably in the range of 10 to 100 parts by weight, particularly 20 to 80 parts by weight, relative to 100 parts by weight of the water-soluble polymer. Is more preferably within the range. The total amount of the cationic polymer compound is 10
If it is less than parts by weight, the water resistance of the image at the time of inkjet recording is insufficient within the range of the coating amount, and it cannot be used for extremely severe image retention such as barcode, and conversely, The total amount of the cationic polymer compound is 10
When the amount is more than 0 parts by weight, recording with an ink using a dye containing a carboxyl group causes problems such as a change in color development, a decrease in recording density, and uneven recording in a solid portion, which impairs image quality. .

When ink jet recording is carried out on the recording paper of the present invention, the ink is mainly absorbed by the water-soluble polymer and the support, so that the recording layer does not contain a pigment relating to ink absorption. On the other hand, a very small amount of pigment can be added to the recording layer for the purpose of adjusting the physical properties such as the friction coefficient of the surface of the recording paper. The pigment is not particularly limited and can be appropriately selected and used from known pigments.

Further, in order to obtain good quality in ordinary multicolor printing or thermal transfer recording system, it is preferable that the Oken type smoothness of the recording paper surface is 40 seconds or more. If the Oken smoothness is less than 40 seconds, the ink transfer will not be uniform,
A good printed image cannot be obtained.

The support of the recording paper of the present invention is composed mainly of papermaking pulp, and the papermaking pulp is LB.
In addition to KP, NBKP, LBSP, NBSP and the like, various types of waste paper and non-wood fibers such as kenaf are included, and are not particularly limited, and these may be used alone or in combination as necessary.

The filler internally added to the support used in the present invention is not particularly limited and can be appropriately selected and used from known fillers. Examples of such fillers include talc, kaolin, illite, calcined clay, calcium carbonate, titanium dioxide and the like. The amount of the filler used is usually 3 to 20% by weight in terms of the filler in the paper. In the recording paper of the present invention, when the filler is added in an amount of 20% by weight or more in the paper, the surface strength and the like at the time of printing becomes a problem. When calcium carbonate, titanium dioxide, etc. are used, the optical characteristics thereof often cause a decrease in recording density when ink jet recording is performed. Or, it is preferable to use in combination with other fillers. In the present invention, it is particularly preferable to use talc and kaolin alone or in combination from the viewpoint of production cost.

In the present invention, an internally added sizing agent may be used for the support. The internally added sizing agent is not particularly limited and can be appropriately selected and used from known internally added sizing agents used for printing paper and ink jet recording paper. Examples of preferable internally added sizing agents include hydrophobized modified rosin emulsion-based sizing agents. Usually, the amount of the internally added sizing agent is adjusted in the range of 0.05 to 0.6 parts by weight with respect to 100 parts by weight of pulp, but it is not particularly limited.

In addition to the above, the support of the recording paper of the present invention includes, if necessary, an antifoaming agent, a pH adjusting agent, a dye or a colored pigment for adjusting the hue, and a visual whiteness for improving. It is also possible to further use the above fluorescent dyes.

The recording layer can be provided on one side or both sides, if necessary, by using known coating methods such as size press, various blade coating, roll coating, air knife coating, bar coating and the like. However, from the viewpoint of operability and cost, it is preferable to use a size press coating method capable of simultaneously coating both sides on machine.

[0025]

EXAMPLES The specific constitution of the recording sheet of the present invention will be described below with reference to Examples and the characteristics of the recording sheet will be described in comparison with Comparative Examples, but the present invention is not limited thereto. is not. In the examples, "%" means "% by weight" and "parts" means "parts by weight".

Example 1 Hardwood bleached kraft pulp (L-BK) with a beating degree of 450 ml
P) 100 parts of pulp slurry, 10 parts by weight of kaolin, 1.5 parts by weight of aluminum sulfate, 0.1 sizing agent
Parts by weight, when a support containing 0.02 parts by weight of a retention improver is used to make a paper with a twin wire paper machine, a coating solution having the composition shown in Table 1 is applied to both sides by a two-roll size press, and the coating amount per one side. Is coated to a solid content of 2.0 g / m ² and calendered to give a smoothness of 50 seconds and a basis weight of 64 g / m ^2.
I got a recording sheet of.

[0027]

[Table 1]

Example 2 The cationic polymer compound shown in Table 1 above was used as a polymethacrylic acid type quaternary ammonium chloride (cation density 4.0 meq /
g) and the basis weight of 64 g / m in the same manner as in Example 1.
² recording sheets were obtained. Example 3 The cationic polymer compound shown in Table 1 above was treated with alkylamine.
A recording paper having a basis weight of 64 g / m ² was obtained in the same manner as in Example 1 except that the ammonia / epichlorohydrin polycondensation product (cation density 7.8 meq / g) was used.

Example 4 A recording paper having a basis weight of 64 g / m ² was obtained in the same manner as in Example 1 except that the content of the cationic polymer compound in Table 1 was changed to 15 parts. Example 5 A recording paper having a basis weight of 64 g / m ² was obtained in the same manner as in Example 1 except that the coating amount was 4.0 g / m ^{2 in} terms of solid content on one side. Example 6 A recording paper having a basis weight of 64 g / m ² was obtained in the same manner as in Example 1 except that the Oken type smoothness of the recording paper was set to 25 seconds. Example 7 A recording paper having a basis weight of 64 g / m ² was obtained in the same manner as in Example 1 except that the content of the cationic polymer compound in Table 1 was changed to 90 parts. Example 8 A recording paper having a basis weight of 64 g / m ² was obtained in the same manner as in Example 1 except that the coating amount was 0.8 g / m ^{2 in} terms of solid content on one side.

Comparative Example 1 The cationic polymer compounds shown in Table 1 above were prepared by using polymethacrylic acid-based quaternary ammonium chloride (cation density: 1.5 meq /
g) and the basis weight of 64 g / m in the same manner as in Example 1.
² recording sheets were obtained. Comparative Example 2 A recording paper having a basis weight of 64 g / m ² was obtained in the same manner as in Example 1 except that the coating amount was 0.3 g / m ^{2 in} terms of solid content on one side. Comparative Example 3 A recording paper having a basis weight of 64 g / m ² was obtained in the same manner as in Example 1 except that the coating amount was 6.0 g / m ^{2 in} terms of solid content on one side.

Comparative Example 4 A recording paper having a basis weight of 64 g / m ² was obtained in the same manner as in Example 1 except that the amount of the cationic polymer in Table 1 was 0 part. Comparative Example 5 Example 1 except that the blending amount of the water-soluble polymer in Table 1 was set to 0 part.
A recording paper having a basis weight of 64 g / m ² was obtained in the same manner as in the above.

The ink jet recording test, printing test and thermal transfer recording test of the recording sheets obtained in Examples 1 to 8 and Comparative Examples 1 to 5 were carried out by the following methods. The results are as summarized in Table 2. If ⊚ and ∘, it can be used without any particular problem.

(1) Printing Test The printing test was carried out under the following test conditions and evaluated according to the standard. Test conditions Printing machine RI printing machine Ink Sakata ink NewGSL Red ink amount 1.0 cc Rotation speed 80 rpm a, Surface strength The degree of white spots on solid printed parts was visually evaluated. ◎ No white spots ○ Small white spots △ Some white spots × Many white spots

(2) Inkjet recording test The recording test is performed by an inkjet printer (BJC-420).
J: a product name of Canon Inc.) was used to record a predetermined solid pattern and ruled line pattern, and evaluation was made according to the following criteria.

A, Whisker-like ink bleeding (feathering) The whisker-like ink bleeding of a ruled line pattern was visually evaluated according to the following criteria. ◎ No whisker-like bleeding ○ Slight beard-like bleeding △ Some whisker-like bleeding × Marked beard-like bleeding

B, Ink color-developing property The change in color-developing property of the black ink as compared with PB paper (manufactured by Canon Inc.) was visually evaluated according to the following criteria. ◎ No change in color developability ○ Slight change in color developability △ Slight change in color developability × Significant change in color developability

C, The ink waterproof recording material was naturally dried for 1 day, immersed in tap water adjusted to 20 ° C. for 5 minutes, and further naturally dried, and then the image change was visually observed according to the following criteria. Evaluated by ◎ No image change is observed ○ Very slight image change is observed △ Image change is observed × Most of the image is flowing out

(3) Thermal transfer recording test The recording test is performed by a thermal transfer printer (Zebra140Xi).
: Zebra Technologies Co., Ltd.) and recorded according to the following criteria.

A, solid uniformity The uniformity (presence or absence of white spots) of the solid recording portion was visually evaluated. ◎ No white spots ○ Slight white spots are recognized △ White spots are slightly recognized × Many white spots

[0040]

As described above, according to the present invention, it is possible to perform recording by various recording methods including general printing using oxidation polymerization type or ultraviolet curing type ink, and especially image water resistance and character in ink jet recording. A recording paper of excellent quality was obtained.

[0041]

[Table 2]

Continued front page    F-term (reference) 2H086 BA20 BA32 BA35 BA41 BA44                 4D075 CA35 DA04 DB18 DC27 EB07                       EB19 EB22 EB33 EB56                 4L055 AG48 AG71 AG77 AG87 AH01                       AH50 AJ02 BE08 EA12 EA14                       EA29 EA32 FA15 FA19 GA09

Claims (4)

[Claims] 1. A recording layer containing a water-soluble polymer and a cationic polymer compound having a cation density of 2.0 to 8.0 meq / g on at least one side of a support comprising at least a filler and a pulp for papermaking with a solid content of 0.5 per side. g / m ² ~ 5.0 g / m ²
A recording sheet characterized by being provided. 2. The total amount of the cationic polymer compound compounded in the recording layer is 1 with respect to 100 parts by weight of the water-soluble polymer compound.
The recording paper according to claim 1, wherein the recording paper is in the range of 0 to 100 parts by weight. 3. The recording paper according to claim 1 or 2, wherein the cationic polymer compound is an alkylamine / epichlorohydrin polymer compound. 4. The recording paper according to claim 1, wherein at least one surface of the paper has a Oken type smoothness of 40 seconds or more.