JPS59112097A - Paper prevented from ink smearing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides paper that prevents ink bleeding, and in particular contains specific additives in the paper, which prevents ink bleeding, reduces weight, and reduces wear on the paper machine. This relates to paper that cannot be used in any way.

Paper, especially newsprint, is used in large quantities and is printed at high speeds using rotary presses, so it is desirable that it has good ink multiplicity and that it absorbs the solvent as quickly as possible, as well as being lightweight and easy to handle. It is also desirable that the wear of the paper-making machine that manufactures the paper itself be as minimal as possible.

Hitherto, as such paper entangling agents, clay, kaolin, talc, waxite, calcium citrate, quartz (white carbon), etc. have been used.

However, these papers not only do not necessarily have sufficient ink solvent absorption ability, but also have the disadvantage that the specific gravity of the paper itself is low, and the paper-making machine is subject to wear and tear. .

In view of these drawbacks, the inventors have removed the above drawbacks,
In particular, as a result of various studies and examinations aimed at improving the solvent absorption ability of ink, it was discovered that the above object could be achieved by incorporating oil-absorbing calcium silicate with a polycrystalline structure into paper, and the present invention was made based on the present invention. This is the gist of the book.

The oil-absorbing calcium silicate having a polycrystalline structure used in the present invention may take various forms, but it is generally appropriate to use xonotrite or tobermorite. In particular, among the xonotrite type, when it is in a slurry state, it has internal voids that contain water, and the outer shell surface has many wrinkles or grooves, or in addition to these, there are many hair-like structures on the surface. The most preferred is a so-called potato-shaped structure having a protrusion. This kind of structure is
The built-in water can be expelled by drying, and the solvent in the ink can be easily stored in the voids.

As the particle size of calcium silicate used in the present invention, it is appropriate to use an average particle size of about 10 to 200 μm. If the particle size exceeds the above range, the thickness of the paper will be too thick, while if it is less than the above range, the inhalability of the drug may be insufficient, so both are not preferred.

Furthermore, by subjecting the surface of such calcium silicate to lipophilic treatment, the inhalability of the solvent can be further improved.

In this case, the lipophilic treatment agent used is, for example, a non-rogenated alkylsilane such as trimethylchlorosilane,
Alkylalkoxysilane.

A surfactant or the like can be used as appropriate, and as a treatment method, for example, after immersing the treatment agent in a solution dissolved in a bath medium, separating P, washing with water, drying, etc. can be adopted as appropriate. can.

Thus, the content of these calcium silicate in paper is
Approximately 0.2 to 5% of the weight of paper is suitable.

If the content is less than the above range, the inhalability of the solvent will be insufficient, and conversely, if the content exceeds the above range, the substantial performance improvement effect will be reduced even if more is added, so both are preferred. do not have. Among these ranges, it is particularly preferable to adopt a range of 0.5 to λ5 according to the above indication, since a substantially large effect can be obtained with a small amount added.

As the paper containing calcium silicate, for example, newsprint, high-quality paper, etc. can be appropriately employed. In fact, as means for making paper using such calcium silicate, various general paper making apparatuses such as a fourdrinier type can be used.

Next, the present invention will be explained using examples.

Example 1 100 parts (weight) of LPKP pulp, talc (average particle size 1
0μ) 10 parts, rosin-based sizing agent 0.8 parts, sulfuric acid band 1 part, 2 paper strength enhancers (polyacrylamide) O, OS parts, and an average particle size of 50μ.

Oil absorption amount 220rttl/1001 (J Engineering SK 62
21B Law).

Mohs hardness 2. ．． A pulp sample consisting of 1.5 parts of zonotrite fine powder, which is No.
container with water (150 ftm inner diameter + 190 ftm height)
(2), and the propeller was rotated (75,000 rpm) to fully disintegrate the mixture. Next, water is added to this and the concentration is 0.
．． Wet paper was formed on a wire mesh from a suspension diluted to 15% according to the method for preparing hand-sheeted paper for pulp testing (J-Ko SP8209). Layer two sheets of blotting paper on top of the wet paper, place the coach plate on top of it, roll the coach roll back and forth five times, and then remove the wet paper.

Remove the blotting paper and coach plate from the wire mesh. Transfer the wet paper adhering to the blotting paper onto the blotting paper that has been placed on the base of the press in advance, with the wet paper facing up, and place it on a drying plate.
and other blotting papers. Next, on the first press 3.
After dehydration at 5 momme for 5 minutes, the wet blotting paper was peeled off from the drying plate with the wet paper in a second press, another dry blotting paper was placed on top of the wet paper, and dehydration was performed at 35 momme for 2 minutes. After pressing, take out the drying plate with the wet paper on it, stack the two plates with the wet paper on the outside between the drying rings, tighten them, and then put them in a blow dryer. I dried it at room temperature and took it out. The obtained handmade paper had an absolute dry mass of t2jl (6011/i).

Next, one side of this paper was printed entirely in black, and the whiteness of the opposite side, which was not printed, was measured using a Hunter reflectance meter specified in JI851zB, and the whiteness was 62%.

Example 2 100 parts (weight) of LPKP pulp, 10 parts of talc (average particle size 0μ), 0.8 parts of rosin-based sizing agent, 1 part of sulfuric acid, paper strength agent (polyacrylamide) O, OS parts, and Average particle size 100μ, oil absorption 200wl/10
From a pulp sample consisting of 15 parts of tobermorite fine powder, which is No. 011, handsheet paper was prepared in the same manner as shown in Example 1, and the whiteness of the non-printed surface was measured in the same manner as in Example 1. It was 55%.

Example 3 The xonotlite used in Example 1 was immersed for 2 hours in a liquid solution in which trimethylchloro7rane was dissolved in nat2hydrofuran, then washed with water, dried, and treated with lipophilic treatment. The whiteness of the non-printed surface was measured by the same method as shown in Example 1 and found to be 70%.

Example 4 Ioo parts of LPKP pulp (weight), 5 parts of white clay, 0.8 parts of rosin-based sizing agent, 1 part of sulfuric acid, paper strength enhancer (polyacrylamide) O, OS parts, and average particle size of 100
A handmade paper was prepared from a pulp sample consisting of 1.5 parts of zonotrite fine powder with μ and oil absorption of 220/100F in the same manner as described in Example 1. When the whiteness was measured, it was 58%.

Comparative Example I 100 parts of LPKP valve (weight), talc (average particle size)
From a pulp sample consisting of 11.5 parts of Logi/based sizing agent, 0.8 part of sulfuric acid band, 1 part of paper strength agent (polyacrylamide) O,OS part, non- The whiteness of the printed surface was measured and found to be 28.

Examples 5 to 8 and Comparative Examples 2 to 5 The results of measuring the whiteness of the non-printing surface were obtained using the same method as in Example 1 and Comparative Example 1, but with varying amounts of Z talc and xonotlite. It is shown in Hori 1.

Procedural Amendment Book Illusion April 1980 Mr. Kazuo Wakasugi, Commissioner of the Japan Patent Office ■, Display of the Case 1982 Patent Application No. 220344 2, Name of the Invention Paper that Prevents Ink from Smearing 3, Person Making Amendment Case Relationship with Patent applicant address: 2-1-2 Marunouchi, Chiyoda-ku, Tokyo Name (
004) Asahi Glass Co., Ltd. 4, Agent 8, Contents of amendment: Copywriting of the specification (no change in content)
that's all

Claims (1)

[Scope of Claims] 1. Paper that prevents ink from bleeding, characterized by containing oil-absorbing calcium silicate with a polycrystalline structure in the paper. 2. Claim (1) wherein the oil-absorbing calcium silicate having a polycrystalline structure is a xonotrite type or tobermorite type crystal.
paper. 3. The lid containing oil-absorbing polycrystalline calcinic acid, rum, is in an amount of 0.2 to 5 inches based on the weight of the paper (1
) or (2) paper. 4. The paper according to claim (1) or (3), wherein the oil-absorbing polycrystalline calcium silicate has a surface treated to make it lipophilic. 5. The claim that the means for lipophilic treatment of the surface is an alkylsilane, a halogenated alkylsilane, or a surfactant (
4) paper.