JP2002275795A - Information printing paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information printing paper to be used in image printers, capable of eliminating bleeding through blocking horizontal ink flow for water- based ink and affording good print uniformity. SOLUTION: This information printing paper is such as to contain an internal sizing agent and a filler and coated with a coating liquid; wherein the internal sizing agent is an alkenyl ketene dimer polymer stabilized with either polyamidoepichlorohydrin or polydiallyldimethylammonium chloride(DADMAC) (polymer-stabilized alkenyl ketene dimer), the filler is wet-ground CaCO3 or precipitated CaCO3 , and the coating liquid comprises (a) at least one of oxidized starch, cationic oxidized starch, and enzyme-modified starch, (b) a styrene-acrylic emulsion(SAE) and (c) common salt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording sheet used in an image printing apparatus of an ink jet system as well as a xerographic system. More specifically, by using a polymer-stabilized alkenyl ketene dimer as an internal sizing agent and combining it with a specific surface coating liquid, it can be used not only as a xerographic system but also as an inkjet recording paper. Related information recording paper.

[0002]

2. Description of the Related Art In recent years, various information processing systems have been remarkably developed, and recording apparatuses corresponding to the respective systems have been developed and used. Among these, the mainstream is the xerographic system, but it has features such as low noise, low running cost, light weight, compactness, and easy multicoloring. Ink jet systems have also been used. For this reason, xerographic transfer paper has often been diverted as ink-jet recording paper.

[0003] However, as the recording paper of the ink jet recording method, since the ink is water-soluble,
Higher characteristics such as good absorbency in the thickness direction of the recording paper, high absorption speed, and high printing color density are required. Therefore, information recording paper called xerographic method and ink jet method commonly used in which the sizing process of the xerographic transfer paper is enhanced and the characteristics required for the ink jet are improved has been developed, but the quality is still satisfactory enough. Has not been obtained.

Heretofore, reactive sizing agents such as alkyl ketene dimer (AKD) or alkenyl succinic anhydride (ASA) have been used as sizing agents for preventing ink bleeding to exhibit excellent performance as information recording paper. Although widely used, paper obtained by using these sizing agents has been put to practical use because of the problem of bleeding as an inkjet recording paper, and it is not possible to obtain uniform recording image quality. Absent. This is because the alkyl group of the alkyl ketene dimer or the alkenyl group of the alkenyl succinic anhydride has a highly hydrophobic chain having 16 to 18 carbon atoms.

[0005] In recent years, alkenyl ketene dimers have also been used as sizing agents (eg, "Aquapel" (registered trademark) 421 of Hercules Inc.). The alkenyl group of the alkenyl ketene dimer is an unsaturated chain having a double bond, is highly reactive compared to the alkyl ketene dimer, and forms a strong bond with cellulose. Due to their hydrophobicity, inkjet recording papers using alkenyl ketene dimers have the same disadvantages as those using alkyl ketene dimers.

Further, US Pat. No. 5,685,815 (see Japanese Patent Application Laid-Open No. 7-238449) discloses that at 35 ° C., at least one branched alkyl group or alkenyl group and a 2-alkyl group having a linear alkyl group. It is disclosed that a multimer of oxetanone (ketene) is used as an internal sizing agent, and it has been shown that suitable results can be obtained as xerographic transfer paper. Is also not disclosed.

[0007]

As a result of various studies on the properties of the above-mentioned known ketene dimer sizing agent, the inventors of the present invention have found that even when alkenyl ketene dimer is used alone as an internal sizing agent, ink jet recording paper is used. As a result, a polymer having a good quality cannot be obtained, but it is reacted with a specific polymer to form a polymer-stabilized alkenyl ketene dimer. Further, when a styrene acrylic emulsion (SAE) is used in combination with a surface sizing agent, Although the degree of hydrophobicity of the stabilized alkenyl ketene dimer is the same as that of the alkyl ketene dimer or alkenyl ketene dimer, it hinders horizontal ink flow for water-based inks and provides good print uniformity. To eliminate bleeding and complete the present invention. Which it has led to.

[0008]

That is, the present invention relates to an information recording paper comprising a polymer-stabilized alkenyl ketene dimer, particularly polyamide epichlorohydrin or polydiallyldimethylammonium chloride (poly-DADMAC), as an internal sizing agent. It is characterized by using a stabilized alkenyl ketene dimer (hereinafter, referred to as "polymer stabilized alkenyl ketene dimer").

As a polymer for stabilizing an alkenyl ketene dimer, polyamide epichlorohydrin and polydiallyldimethylammonium chloride (p.
poly-DADMAC) can be used, but the latter is superior in terms of xerographic copying characteristics and ink jet printing characteristics. In addition, polydiallyl dimethyl ammonium chloride (poly-DADMA)
C) is already well known in the paper industry as an anionic colloidal neutralizer, but has not been used as a stabilizer for alkenyl ketene dimers. As the alkenyl ketene dimer, a well-known alkenyl ketene dimer can be used. In the present invention, commercially available Aquapel (registered trademark) 421 manufactured by Hercules Corporation was used.

Further, the present invention relates to an information recording paper,
A polymer-stabilized alkenyl ketene dimer is used as an internal sizing agent, and wet-ground CaCO 3 is used as a filler.
₃ or sedimentable CaCO _3, and a coating liquid containing the following three components (a) to (c) is further applied to paper. (A) at least one kind of oxidized starch, cationic oxidized starch or enzyme-modified starch (b) styrene acrylic emulsion (SAE) (c) salt

The addition amount of the polymer-stabilized alkenyl ketene dimer may not be too large or too small, and the optimum addition amount is an effective amount per ton of paper, that is, 1 to 2 kg in terms of alkenyl ketene dimer (hereinafter the same). It is. If the addition amount is too small, the hydrophobicity is reduced, causing the ink to penetrate to the back surface of the paper, and the fixability of the toner is deteriorated. However, if the addition amount is too large, it causes deterioration in the quality of ink jet recording (bleeding, uniformity of recording, feathering, etc.).

The amount of CaCO ₃ added is 70 g / m ^2.
Of paper is at most 18 wt%. If the amount is too large, the polymer-stabilized alkenyl ketene dimer will react with the filler, causing hydrolysis of the alkenyl ketene dimer in the next step and loss of hydrophobicity. This material easily migrates to the surface of the paper and reduces the fixability of the toner.

The coating in the size press is carried out by mixing oxidized starch, cationic oxidized starch or enzyme-modified starch with NaCl and a surface sizing agent styrene acrylic emulsion (SAE), and using a metering bar, a gate roll or a simple roll of a size press device. Applied by size press roll. NaCl is added in an amount of 2 to 7 kg per ton of paper in order to suppress the electrostatic charge to 100 mV or less, and the surface sizing agent SAE is added in an amount of 1 to 1 in terms of dry SAE per ton of paper in order to improve the fixability of the toner. Add 2 kg. The coating weight on the size press is from 2 g / m ² to 3 g / m ² so that the coating is uniform.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The information recording paper of the present invention will be described below in detail with reference to embodiments.

[0015]

Example 1 A pulp consisting of 12% by weight of softwood bleached kraft pulp (NBKP) and 88% by weight of hardwood bleached kraft pulp (LBKP) was used.
Alkenyl ketene dimer stabilized with polydiallyldimethylammonium chloride (poly-DADMAC) as an internal sizing agent: 1.574 kg / ton, NaCl usage in size press: 4.56 kg / to
n, starch used for surface coating: oxidized starch, coating liquid application amount: 3 g / m ² , surface sizing agent (SA
E) Usage: 4.5 kg / ton, basis weight: 70 g / m ²
And The following evaluation tests were performed on the obtained paper.

(Fixing Property of Toner) A xerographic copying machine was used to evaluate the fixing state of toner on paper. As an optical density tester, for example, Macbeth model
As RD918 and seal tape, a magic tape 810 manufactured by Scotch Corporation is used with a width of 1/2 inch (1.27 cm). As a first step, a block pattern having an optical density in the range of 0.6 to 0.7 is copied on paper. Next, the actual optical density is measured. The sealing tape is applied to the copy surface of the paper, and a roller is applied 10 times on the surface of the sealing tape at a pressure of 0.1 to 0.15 kg / cm ² . Then, after removing the sealing tape from the paper surface, the optical density of the surface is measured again. The toner fixing property is evaluated based on a% value obtained by dividing the last optical density value by the first optical density value. The toner fixability of the paper obtained in this example was "9
5.34% ".

(Curl Degree after Copy) The curl degree after copy was measured using A4 size paper,
It was determined by comparing with a pattern having a degree of curl of from 10 to 10. This is the same method as the Japanese TAPPI standard. The curl degree after copying of the paper obtained in this example is
It was "3".

(Double Feeding Test) The double feeding of paper is shown by the number of sheets fed by 2,500 sheets continuously passed through a high-speed printer. The double feed test result of the paper obtained in this example was "0", and no double feed was observed.

(Inkjet Recording Test) Standard test methods and evaluation standards were established at the R & D center for quality evaluation measurement of inkjet recording. The quality evaluation items of the inkjet recording paper are shown below: a. Recording uniformity b. Bleeding between each color c. Feathering d. Ink permeability To evaluate and determine the characteristics of a to d, 1
To 5 standard evaluation patterns were created. The evaluation is shown by the following numerical values. 1: Poor 2: Slightly bad 3: Normal 4: Good 5: Extremely good Results obtained using commercially available BJC4650 model manufactured by Canon Inc. and Deskjet 400 model manufactured by Hewlett-Packard Company as inkjet printers. Are summarized for each printer, and are shown in Table 1 together with the results of other examples or comparative examples.

[0020]

Example 2 As pulp, softwood bleached kraft pulp (NBKP): 11% by weight and hardwood bleached kraft pulp (LBKP): 89% by weight were used.
The same polydiallyldimethylammonium chloride as in Example 1 (poly-DADMAC) as an internal sizing agent
-Stabilized alkenyl ketene dimer: 1.593k
g / ton, NaCl usage in size press: 5.0
8 kg / ton, starch used for surface coating: paper was prepared in the same manner as in Example 1 except that the enzyme-modified starch was used, and the characteristics of the paper obtained in the same manner as in the measurement method described in Example 1 were used. It was measured. The paper obtained in this example had a toner fixing property of "95.34%", a curl degree after copying of "3", and a multifeed test result of "0". Table 1 shows the quality evaluation of the paper obtained in Example 2 as an ink jet recording sheet together with the results of other Examples or Comparative Examples.

[0021]

COMPARATIVE EXAMPLE 1 A pulp composed of 10% by weight of softwood bleached kraft pulp (NBKP) and 90% by weight of hardwood bleached kraft pulp (LBKP) was used.
Alkyl ketene dimer commonly used as an internal sizing agent: 1.083 kg / ton, NaCl usage in size press: 6.10 kg / ton, starch used for surface coating: Except for oxidized starch Paper was prepared in the same manner as in Example 1, and the characteristics of the obtained paper were measured in the same manner as in the measurement method described in Example 1. The toner fixability of the paper obtained in this example is "92.
20% ", the degree of curl after copying was" 3 ", and the result of the double feed test was" 2 ". Table 1 shows the quality evaluation of the paper obtained in Comparative Example 1 as an ink jet recording sheet, together with the results of other Examples or Comparative Examples.

[0022]

Comparative Example 2 As pulp, softwood bleached kraft pulp (NBKP): 10% by weight and hardwood bleached kraft pulp (LBKP): 90% by weight were used.
Alkyl ketene dimer commonly used as an internal sizing agent: 1.100 kg / ton, amount of NaCl used in size press: 6.05 kg / ton, starch used for surface coating: except for enzyme modified starch, Paper was prepared in the same manner as in Example 1, and the characteristics of the obtained paper were measured in the same manner as in the measurement method described in Example 1. The toner fixability of the paper obtained in this example is “91.
50% ", the curl degree after copying was" 3 ", and the double feed test result was" 2 ". Table 1 shows the quality evaluation of the paper obtained in Comparative Example 2 as an inkjet recording paper together with the results of other Examples or Comparative Examples.

[0023]

[Table 1]

As is clear from the above results, polymer-stabilized alkenyl ketene dimer,
In particular, polydiallyldimethylammonium chloride (p
The paper of the present invention using an alkenyl ketene dimer stabilized with (poly-DADMAC) has a high hydrophobicity and is less slippery when compared with a paper using an alkyl ketene dimer as an internal sizing agent. To become
It can be seen that the problem of double feeding in the xerographic copying machine can be reduced and the fixability of the toner has been improved. Further, the paper of the present invention obtained by the above-mentioned combination is excellent in recording quality, bleeding, feathering, ink permeability and the like as compared with those using the alkyl ketene dimer even when used for ink jet recording, so The paper is also suitable for inkjet recording and can be used for both xerographic copying machines and inkjet printers.

[0025]

As described in detail above, the paper of the present invention is
It has excellent toner fixability in xerographic copiers and eliminates the problem of double feeding of paper, so it can be used not only as xerographic transfer paper but also as recording quality, bleeding, and ink jet recording.
Because of its excellent feathering and ink permeability, it can be used as recording paper for xerographic copying machines and inkjet printers.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03G 7/00 101 G03G 7/00 101J 101B (74) One agent above 100093470 Patent Attorney Fujio Oda (72 Inventor Tsai Ming Tung Jawa Timur Mo Jokerto Jalan Raya Surabaya-Mojokerto Kaem 44 P.O.Box 115 (72) Inventor Chandra Heliyanto Jawa Timur Mo Indonesia Joraya Jalan Raya Surabaya-Mojokerto Kaem 44 P.O.Box 115 (72) Inventor Heli Susanto Jawa Timur Mo Jokerto, Indonesia Jalan Raya Surabaya-Mojokerto Emu 44 P. Wow box 115 F-term (reference) 2H086 BA15 BA21 BA31 BA32 BA35 BA36 BA37 4L055 AA02 AA03 AC06 AG07 AG11 AG12 AG40 AG48 AG63 AG71 AG80 AG89 AH11 BE08 EA14 FA30 GA09 GA11

Claims (6)

[Claims] 1. An information recording paper comprising an internal sizing agent and a filler and further having a coating liquid applied to the surface of paper, wherein a polymer-stabilized alkenyl ketene dimer is used as the internal sizing agent. An information recording sheet characterized by the following. 2. The method of claim 1, wherein the polymer-stabilized alkenyl ketene dimer is polyamide epichlorohydrin or polydiallyldimethylammonium chloride (DADMAC).
The information recording paper according to claim 1, wherein the alkenyl ketene dimer is stabilized by any one of the above. 3. The method according to claim 1, wherein said filler is wet-ground CaCO ₃ or sedimentable CaCO _3.
Or the information recording paper according to 2. 4. The information recording paper according to claim 1, wherein the coating liquid contains the following components (a) to (c). (A) at least one kind of oxidized starch, cationic oxidized starch or enzyme-modified starch (b) styrene acrylic emulsion (SAE) (c) salt 5. The information according to claim 1, wherein the content of the polymer-stabilized alkenyl ketene dimer is 1 to 2 kg in terms of alkenyl ketene dimer per tonne of paper. Recording sheet. 6. The styrene acrylic emulsion (S)
AE) is 1 to 2 as dry SAE per ton of paper
kg, and the amount of the NaCl used is 2 to 1 ton of paper.
The information recording paper according to claim 4, wherein the information recording paper weighs 7 kg.