WO2003013872A1

WO2003013872A1 - High gloss ink-jet recording paper for photographic printing

Info

Publication number: WO2003013872A1
Application number: PCT/JP2002/005681
Authority: WO
Inventors: Antonius Soemarijanto; Lukmannul Hakim; Chandra Heriyanto; Ming Tsung Tsai
Original assignee: Pt. Pabrik Kertas Tjiwi Kimia Tbk.; Suzuki, Rikio
Priority date: 2001-06-07
Filing date: 2002-06-07
Publication date: 2003-02-20
Also published as: JP3954327B2; CN1512942A; JP2002362010A; CN1278869C

Abstract

A high gloss ink-jet recording paper for photographic printing, characterized in that it has a single coating layer and the coating layer comprises a colloidal silica, a plastic pigment, polyvinyl alcohol (PVA) and polydiallyldimethylammonium chloride (poly-Dadmac). The coating layer is provided by a method comprising applying a cast coating liquid comprising the above components on a raw paper (1) with an air knife coater (2), supplying an acid solution with a dip coater (3) on a roll to thereby allow the cast coating liquid to gelate, and then press the gelled coating onto a heated cast drum (5) in a mirror-smooth state through a nip (6) between a press roll (4) and a cast drum (5), for drying and finishing. The ink-jet recording paper, which has only a single coating layer, exhibits a gloss comparable or superior to that of a conventional paper having two coating layers, and also has excellent ink-jet characteristics.

Description

High gloss ink jet recording paper for photo printing

Light

Technical field

The present invention relates to a cast coated paper having an excellent surface gloss and a high quality photographic print image quality and suitable for an ink jet printer, and more particularly, to a photographic print manufactured by an inkjet gelling method. Gloss recording ink jet recording paper.

Background art

Cast paper is usually a mineral pigment coated paper with a high surface gloss and smoothness, and because of its excellent printability, it is commonly used as inkjet recording paper for photo printing. I have. However, conventional ink-jet recording papers for photo printing with high gloss, which have two or three coating layers, have a disadvantage that the manufacturing process is complicated.

In general, a cast coat layer having high gloss has a structure in which a coating layer is dense, and therefore has a limit in ink absorbability, and thus has a surface which is not suitable as ink jet recording paper. In other words, ink-jet recording paper must have a porous coating layer and sufficient ink absorbency, but on the other hand, a porous coating layer has the contradictory property that it is difficult to obtain high brightness. have. Therefore, it is very difficult to simultaneously satisfy both the surface gloss and the suitability for inkjet recording of the cast coat paper with only one coating layer, and it has not been put to practical use. Disclosure of the invention

As a result of various experiments, the present inventors have adopted a wet gelling method as a cast coating method, and have achieved a superior coating layer by using a cast coating liquid having a specific composition. The inventors have found that an inkjet recording paper having glossiness and photographic print quality can be obtained, and have completed the present invention. That is, an object of the present invention is to provide an ink jet recording paper suitable for an ink jet printer, which can obtain a photo print quality of 70% or more in glossiness with only one coating layer.

The glossy ink jet recording paper for photographic printing according to the present invention has only one coating layer, and the coating layer is formed of at least colloidal silica, plastic pigment, polybutyl alcohol (PVA) and polydiaryl dimethyl ammonium.とする It is characterized by containing Mukoku Ride (poly-D admac). Further, the glossy inkjet recording paper for photo printing according to the present invention, wherein the coating layer further contains at least one selected from the group consisting of precipitated silica, styrene butadiene latex (SBR), and polyethylene wax. It is characterized by doing.

Further, the glossy inkjet recording paper for photo printing according to the present invention is characterized in that the coating layer is coated by a wet gelling method. Further, the glossy ink jet recording paper for photographic printing according to the present invention is characterized in that the gelling agent obtained by the above-mentioned jetting method is polyacrylic acid (PAA).

In the wet gelling method, when the coating layer applied to the base paper layer is still in a wet state, it is treated with an acid solution such as polyacrylic acid (PAA) to form a gel state, and then heated to a mirror-like surface. This is a method in which it is pressed against the surface of the cast drum and dried to finish. FIG. 1 shows a cast coating apparatus used in the wet gel process of the present invention. In Fig. 1, the supplied base paper 1 is applied with a cast coating solution using an air knife coater 2, and then an acid solution is flowed over a roll with a dip coater 3 to cast the base paper. The liquid is gelled, then passed through a nip 6 between a press roll 4 and a casting drum 5 and pressed against a heated mirror-like casting drum 5 to be dried and finished. When producing this type of paper by wet gelling, very important factors are that the coating layer on the base paper is gelled before it contacts the cast drum surface, that it is in a proper wet state, And have sufficient surface strength when pressed against the cast drum surface by a press roll.

Another usually troublesome property is that if the surface coating is too dense, it will be difficult to absorb ink on the surface coating. The wet gel process in the cast coating equipment forms a strong gel when immersed in an acid solution, which allows it to pass through the press nip at a higher pressure, thus reducing the performance of the coating solution. Dependent. If the strength of the resulting gel is not strong, the coating solution will dissolve in the acid solution, even though the remaining acid will be used in the next step. As a result, in the next process, the paper becomes dirty and the gloss is reduced.

The present inventors have repeated various experiments and developed a cast coating solution satisfying the above conditions. By using the cast coating solution of the present invention, the components of the coating layer are prevented from being dissolved in the polyacrylic acid solution at two nips between the casting drums. What is more important is that the surface of the coating layer can be kept clean and a highly glossy surface can be obtained with only one coating layer.

The cast coating liquid used in the present invention includes plastic pigment as a pigment, precipitated silica, colloidal silica, SBR latex (styrene-butadiene latex) as a binder, fully hydrolyzed polyvinyl alcohol (PVA) and poly It is composed of main components such as do-d-mac polymer (poly-D-admac, polydiaryl dimethyl ammonium chloride).

The particle size of the precipitated silica is of the order of 5 to 15 / X HI, preferably 8 to 12 nm. Colloidal silica particle size ranges from 10 to 20 nm, PAA solution concentration from 5-1 A range of 0% is preferred. Further, a coverage of the cast coating liquid 1 5~ 20 gZm ² extent good, also cast temperature of the drum 100 ° C~ 1 20 ° C, pressure pressure to cast drum at a linear pressure 110-150 kg / cm is desirable.

By using a coating solution with these formulations, it is possible to achieve excellent feathering, bleeding, print uniformity, permeability, optical density, water retention, and weather resistance with only one coating layer. High glossiness with high quality photo print quality, as well as securing a porous coating layer suitable for ink jet printers with excellent characteristics Ink jet recording paper is obtained. Hereinafter, specific examples and effects of the present invention will be described with reference to Examples and Comparative Examples. As the base paper, a well-known one commonly used for high gloss ink jet recording paper for photo printing is manufactured using a cast machine with an air knife coating device as shown in the drawing, and the ink jet recording quality evaluation is conducted at the R & D center. Judgment was made in accordance with the standard test method and evaluation criteria established in.

The following shows the standard test methods and evaluation standards for evaluating the quality of ink jet recording paper.

a. Feathering (feathering black, feathering color)

The degree of spread of bleeding from the printed line to the printing surface is shown.

Judge by comparing with the standard pattern. (1 is the lowest quality, 10 is the highest quality) b. Breeding (black vs. color, color vs. color)

It shows the extent of bleeding between different colors.

Judge by comparing with the standard evaluation pattern. (1 is the lowest quality, 10 is the highest quality) c. Printing uniformity (black, color)

Evaluate print uniformity in relation to ink absorption.

Judge by comparing with the standard evaluation pattern. (1 is the lowest quality, 10 is the highest quality) d. Ink permeability Judge by comparing with the standard evaluation pattern. (1 is the lowest quality, 10 is the highest quality) e. Optical density

Using a Mac Beth tester (trade name), the average value of four different measurements for each color.

f. Drying speed

Use Canon BJC240 printer. After printing a black pattern with this printer, start measurement with a stopwatch when the print zone begins to be seen. Using other paper, determine whether the printing surface is wet or dry, stop the stopwatch with the printing surface dry, and read the time.

g. Water resistance

Use all printers to print patterns including black, cyan, magenta and yellow for water resistance testing. It is then kept at a temperature between 25 and 30 ° C. for a minimum of 2 hours until the printed surface is completely dry. First test the optical density and then test for water resistance. 3 c Spray water of c and measure 〇. D. before and after spraying. The water resistance value is expressed as a percentage value obtained by dividing O.D. after spraying by O.D. before spraying and multiplying the value by 100. BEST MODE FOR CARRYING OUT THE INVENTION

【Example】

Example 1

As the coating liquid A, one having the following composition was used. As the gelling agent, an aqueous solution of polyacrylic acid was used at a concentration of 7.5% (all component contents represent weight%). Composition of coating liquid A

Settling force (particle size 12 μτη) 12.2%

Colloidal silica: 61.0% Plastic pigment 6.1%

SBR latex 4.9%

P V A 3.0%

poly D a d m a c 1.0%

Polyethylene resin 1.5%

Gloss aid (OBA) 0.3%

t o t a l 00% The measurement results of the cast paper obtained using this coating liquid A are as follows, White gloss (Sheet Gloss): 85%

Gloss (highest): 90.4% ISO

Coating weight: 18.2 g / m ²

Moisture: 5.1%

Table 1 shows the results of the obtained inkjet test.

【table 1】

Example 2

As the coating liquid B, one having the following composition was used. The gelling agent used was an aqueous solution of polyacrylic acid at a concentration of 7.5%. Composition of coating liquid B

Colloidal silica: 71.4%

Plastic pigment: 10.7%

PVA: 3.6%

poly-D a d m a c: 10./%

Polyethylene wax: 3._6%

t o t a l 00 The measurement results of the cast paper obtained using this coating liquid B are as follows, White gloss (Sheet Gloss): 79%

Light intensity (highest): 86.3% ISO

Coated Weight: 16. 0 g / m ²

Moisture: 6.2%

Table 2 shows the results of the obtained ink jet test.

[Table 2]

Inkjet pudding First-in-first-out E son Stylus Canon

Color 1520 BJC4650 Optical density

Cyan 57, 57 1.56 <τ ^^ nog "" 1.98 1.96

1. 9 1. 97

1.99 1.63-飞 Η f * J

C "10 9 Color 10 9

-No sor r

Black to Color 1 9 9

H ^J Ming Sofu 1 Earth

8 8 Color 8 8 Ink permeability

, 10 10 color 10 9 ink drying time fast fast

Moisture resistance 0% (excellent) 0% (excellent) [Comparative example]

Here, as a comparative example, an example in which two coating layers which are usually performed is provided. The following compositions were used as the precoat coating solution D and the topcoat application solution E, respectively. In this comparative example, gelation was not performed.

Composition of precoat coating liquid D

Precipitated silica: 60, 0%

Plastic pigment: 7.0%

PVA: 18.0%

noly-D a d m a c: 15.0%

t o t a l 00 Composition of coating liquid E for top coat

Colloidal silica: 71.0%

Plastic pigment: 11.0%

PVA: 3.5%

poly-D a d m a c: 丄 1.0%

Polyethylene ヮ: 3.5%

The measurement results of the cast paper obtained using the two-layer coating solution of tota100 are as follows.

White Gloss: 79%

Light intensity (highest): 86.0% I SO

Pre-coating weight: 10. 0 g / m ²

Top coat weight: 8.0 g / m ² Moisture: 6.0%

Table 3 shows the results of the obtained ink jet test.

[Table 3]

Inkjet pudding Yuichi test types Epson Stylus Canon

Color 1520 BJC4650 Optical density

Cyan 1.57 1.55 magenta 1.95 5 1.95 yellow 1.96 1.98 ri 1.95 1.65 feathering

10 9 Color 10 9 Reading

Black to color 9 9 color to color 9 8

Printing uniformity

Black 8 8 Color 1 8 8 Ink penetration

10 10 Color 10 10 Ink drying time Fast

Moisture resistance 0% (excellent) 0% (excellent) As is evident from the results of Examples 1 and 2 and Comparative Example, the cast paper obtained according to the present invention has only one coating layer, and is different from the case where the conventional two coating layers are provided. It has been confirmed that it has the same or higher white gloss (Sheet Gloss) and gloss (highest value) and also has excellent ink jet characteristics. The ink jet recording paper obtained according to the present invention has excellent ink jet recording characteristics such as feathering, bleeding, uniformity of printing, permeability, optical density, water retention, and weather resistance with only one coating layer. As well as maintaining a porous coating layer, it also has excellent white gloss (Sheet Gloss) and gloss (highest value), so high quality photo print quality can be obtained. Has the effect of

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a view showing a cast coating apparatus used in the wet gel process of the present invention.

[Explanation of symbols]

1: Base paper

2: Air knife coater

3: Dip coater

4: Press mouth-Nore

5: Cast drum

6: Nip

Claims

The scope of the claims

1. The coating layer consists of only one layer, and the coating layer contains at least colloidal silica, plastic pigment, polyvinyl alcohol (PVA), and polydimethyl dimethyl ammonium chloride (poly-Dadmac). High-gloss ink jet recording paper for photo printing, characterized in that:

2. The method according to claim 1, wherein the coating layer further contains at least one selected from the group consisting of precipitated silica, styrene-butadiene latex (SBR), and polyethylenex. High gloss inkjet recording paper for photo printing.

3. The high gloss ink jet recording paper for photographic printing according to claim 1, wherein the coating layer is coated by a wet gelling method.

4. The high gloss ink jet recording paper for photographic printing according to claim 3, wherein the gelling agent by the wet gelling method is polyacrylic acid (PAA).