JPS5859889A - No-carbon duplicate paper improved pasting characteristics - Google Patents

Abstract

PURPOSE:To improve the pasting characteristics for every set of no-carbon duplicate papers by providing a water proofness and/or a water repellency for the face other than one coated with microcapsules of an original paper for the no-carbon duplicate paper. CONSTITUTION:One side of an original paper for no-carbon duplicate paper is coated with a water-resistant high polymer of polyurethane, polyolefin, maleic acid series, etc., or with a combination of boric acid, aluminum, zirconium, and a high molecular compound, e.g., starch, polyvinyl alcohol, etc., so as to give a water proofness to the one side, where a water repellency is provided concurrently or separately by coating the one side with a wax emulsion, etc. The original paper thus treated can be effectively pasted because there occurs no adherence between the back of a lower paper and the surface of an upper paper accept for the other sides.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to no-kernel copying paper-t'To
More specifically, the present invention relates to a no-kernel copying paper using an improved base paper.

No-kern copying paper is widely used for documents such as slips, and is basically made by dissolving colorless basic dye and containing microcapsules containing 9 hydrocarbon-based internal phase oils on the back side of base paper. With paper.

The acidic substance is smeared on the front side of the base paper, and the bottom paper is smeared on the front side of the base paper.
Amurua paper (self-coloring sheet), in which each sheet is smeared on the same side, is also well known and has been known for over nine years. In addition to coating the entire surface with a coater, switch printing (part-coating) using a printing machine has also become popular.

When creating a slip with a set of multiple sheets of non-curling copy paper, it is necessary to adhere the sets to each other using a "combining seam". This is an extremely important factor.

It's up to DK to sort it out. To explain the suitability for gluing in more detail, when creating a set of multiple sheets of slips, for example, in the case of a mold set,
s-1! ) Printed sheets of uncarn paper set in the order of 10 sheets of paper] are sandwiched at a height of several 10 cIL, and one set of sheets is applied to one place on the cut surface. After drying, side A should be placed in the required set (top paper + middle paper,
In the case of (inner paper + middle paper, middle paper 10 sheets), the gap between the sets (lower paper and upper paper) that are glued and do not require contact is 11
! Since the slips are not attached, it is easy to take out a set of slips.

Tono's suitability for Yazuki is one important thing.

There were many problems with F, such as weak adhesive strength within a set or gluing between sets, and improvements were desired. In addition, in recent years, the number of combinations with soot printing and multi-sheet sets using self-printing paper (such as combinations of high-quality paper + (m-1) self-printing paper, or self-printing paper, etc.) has increased, and there are concerns about their suitability for gluing. This is easy to occur, and improvements have been desired.

Now, conventionally, improvements in the aptitude for bonding have been carried out from the aspect of the main K ``combination glue''.

For example, mixing an aqueous emulsion of a resin with a 42tin derivative described in Japanese Publication No. 210-7634.

rf! l83-12847%, same! $3-12846, No. 53-21415, No. 53-21415, Use of the formalin condensate of 7-talenesulfonic acid described in No. 53-21415, No. 53-12844, No. 53-1
Although solutions containing surfactants as described in No. 2845 have been investigated, they are still unsatisfactory in many cases.

The present applicant investigated the suitability for pasting mainly from the aspect of paper, and proposed in Japanese Patent Application No. 55-148063 that a surfactant be added to the surface of the 1° capsule to improve the suitability for pasting.

It is an object of the present invention to improve the gluing suitability of non-kern copying paper, and is particularly characterized by the structure of the base paper for non-curn copying paper.

By using this base paper, we have made it possible to significantly improve the durability of non-kernel copying paper, which has had many problems in the past.

The base paper for copying paper for Noker In is usually high-quality paper (although there are some medium-quality paper recently), and it is basically the same as general printing paper or form paper, and has a thickness of 1.
There are various gray Ps, including basis weight (weight), hue, etc., and they are made by controlling the desired smoothness, size, firmness, strength (tearing, tensile), etc., and the base paper is coated with capsule coating liquid and acid. A liquid coating of material is coated (or printed) to obtain uncurled copy paper.

It is known that heat treatment is applied to the base paper for Nokhan Teishi before smearing.
Prime the capsule smeared surface with an oleophobic agent. 49-1091
No. 18 creates a layer of alkaline material under acidic material.

No. 5B-112118, the capsule is coated with a capsule protective material and the capsule is smeared. B4-190 (No. 1 is coated with a thermal adhesive on one side. No. 50-89111 is a base paper or capsule layer containing a desensitizing agent. No. 54-15021)
For No. 0, there is a known method such as applying clay for Le Pen writing.

The present invention is characterized by making one side of the base paper orchid water resistant and/or water repellent for suitability for gluing.

The word "water resistant" is used in paper manufacturing, and indicates that even after soaking in water and drying, it remains in the same state as before. When used, there is almost no water resistance. There are various methods for testing water resistance, but the easiest method is the wet f(W@) method using the finger (rδ-gi・r) method.
The Rab) test is described in the P1'I and M8TM methods, and can be qualitatively determined easily by rubbing the surface of the paper with a finger moistened with water.

Water repellency is also a term widely used in the paper industry, and is referred to as contact angle.
Hochu Water Reperency Tester (WatIr)
R＠p＊llam＠y tewater）l (This method is described as the ↑mu PPI method as a method for measuring the wettability of a piece of paper, but the angle at which water rolls down on a piece of paper is also a harmful factor. can be judged.

Water resistance and water repellency are originally two different things, but for example, adding a water repellent can improve water resistance as a result.

The addition of a water-repellent agent often makes it water repellent, and they often have substantially the same effect. Together, they are sometimes collectively referred to as waterproofing agents.

To make it water resistant, the usual methods are to coat it with a chemical (polymer) that itself is highly water resistant, or to add another water resistant agent that is not water resistant itself. .

An example of the former is a water-dispersible polymer emulsion, in which an alkali-soluble resin is dissolved in a volatile alkali such as ammonia and then smeared.

It is also known that it becomes water resistant when dried.

Representative examples of the latter water resistance agents include those that utilize polyvalent metal ions, and aldehys P and nixies that utilize a reaction with one reactive group.

Examples of water-resistant polymers include 4-urethane and pre-(halogenated) olefin polymers.

Maleic acid polymer (maleic acid resin or ammonium salt such as styrene-maleic anhydride copolymer), vinegar copolymer, 8BR resin.

Acrylic resin, 4? Ammonium salts of polymers with carxyl groups, such as special PVA resins, special Denzoye conductors, and caloxymethyl cellulose.

etc. are commercially available as water-resistant polymers.

First, specific examples of things used as waterproofing agents and L”1
．． Oxalic acid, aluminium, zirconium, calcium ion, formalin, glutaralde kP, glyoxal, urea-formalin resin initial condensate, methane-formalin resin initial condensate, boria ζP epichlorohydrin adduct, I-liol (glycerin, Examples include polyethylene glycol (polyethylene glycol, etc.).

The polymers used at that time are starches, Lipier alcohol, cellulose derivative 1m water maleic acid resin,
It is usually used in combination with acrylic acid resin, acrylic acid resin, l-lyester resin, etc. In order to speed up water resistance or increase the stability of the liquid, appropriate catalysts in additives are also used based on normal contact! Wear.

As the water repellent, there are 9 typical water repellent chemicals that can be used for paper coatings, including wax gel repellent. Various types of wax are commercially available depending on the type of wax. Silicon acids, Duffin® polymers, alkyl ketene imers, metal soaps, and the like are also used to impart water repellency.

The most typical manufacturing method is on the paper machine. Process with a size press.

It is most preferable to use a coating machine such as a size press, a roll coater, or a billpray P coater that can coat different liquids on the front and back sides.

The reason for this is that the excess 11ts of the first coating is often undesirable as an undercoat for the smeared surface if it is water resistant or water repellent, otherwise it is hidden under the 4th coating layer and is useless. There are many.

Pigments, dyes, etc. can be added to the liquid for water-resistant or water-repellent treatment, if necessary.

The effects of the present invention are well understood.

In other words, in the case of "gluing", it is sufficient that the back side of the bottom paper and the surface of the top paper are glued together, and the other sides are easy to glue.The currently used grouping p is: If the surface of the paper is made mainly of water-based polymers or water-based emulsions, if the surface of the paper is made water-repellent, it will not be difficult to wet the paper and will adhere to the paper, improving its adhesion properties. I was embarrassed to be considered a thing.

The major effect of the present invention 1jlK is on the suitability for gluing in the case of swit printing. Suit printing is different from full-surface coating with a coater. A-) coats only the necessary areas (sudt printing), so there is no normal printing area, so it is similar to when ordinary high-quality paper is overlapped. A lot of things don't change. In this case, please do not peel off between sets.
Instead, the whole thing is glued together into a single boot stock. But 1
If you use the base paper for Nokern Teishi according to the present invention, and use the 9-spot upper paper and the lower spot paper (the middle spot paper is printed with 1-ryo strokes, use general high-quality paper)
, it becomes possible to paste between the lower paper and the upper paper, each time the paper is pasted.

In addition, when the base paper for non-kernel copying paper of the present invention is used, the effect in the case of seven-lua paper is also significant. In other words, in the case of conventional self-paper, non-smeared If (high-quality paper), self-surface and non-smeared surface (seven-lua surface) are used. It would have been difficult to make a difference in the adhesiveness and adhesiveness between the surface (fungi) and the non-smeared surface (high-quality paper), but by creating the water-repellent surface of the present invention, the suitability for pasting has been improved. , has been extensively renovated.

This will be explained below using examples.

Example 1 Comparative Example I 42 ml base paper made using 80% LBKP and 120% OAk was coated with a gate roll coater.
Apply oxidized starch 59G liquid to the surface and apply oxidized starch at the same time in midsummer! S- and 4 rear construction P shrimp chlorophyll P phosphorus resin o
S' solution was smeared to obtain Norker-y copying paper base paper (Example 1 paper).

As a comparative example, a similar base paper for Norker-y copying paper (base paper of Comparative Example 1) was prepared with Kpm oxidized starch removed on both sides.

Commercially available resin sut ink was used in a flexo printing machine, and capsule soot ink was also used in a similar flexo printing machine in Example 1. Four strips were printed on the surface of the base paper of Comparative Example 1, and each set of two sheets was stacked about 101 times each so that the colored surfaces matched, and one Example and one Comparative Example were obtained depending on the base paper used.

Naphthalenesulfonic acid formalin 11i gold 411F18
16 parts of l5O-acrylic latex and 68 parts of water were prepared.

Example 1 using this method. M and Comparative Example When one person glued the set of nine pieces on each side, the 1st side of Mr.
A set of two slips was obtained, but in Comparative Example 1, two slips were glued together.

It was difficult to distinguish between the p-sets, which were all part of one block.

Commercially available "Mitsubishi adhesive glue" (trade name,
(manufactured by Mitsubishi Paper Industries) was used, and the rest was carried out in the same manner as in Example 1.') The same important results were obtained.

Example 3 Looking at the oxidized starch and chlorophylline resin of Example 1, 1-styrene anhydride! Except for using ammonium oleic acid salt.

A no-curne copying base paper was prepared in the same manner as in Example 1.

When the contact angle of the surface of this paper with water was measured, it was 9 G' or more, indicating water repellency.

Example 4 In place of the oxidized starch and Boria zeta starch resin of Example 1, 3-phosphate ester starch and o, B
In addition to using s-lyethylene emulsion, a base paper for uncured copying paper was prepared in the same manner as in the Fi process.

On this surface, a coating solution containing 100 parts of activated clay, 6 parts of Denzone oxide, and 8 parts of acrylic latex with a c4 pH of 9.8 was applied in an amount of 8 times.

This material showed good color development as a base paper.

Commercially available top paper (Mitsubishi Mo1 paper, N-40) and middle paper (
= l [OA paper medium, N-40), make 1000 sets of 3 slips, PVmu (4-monyl alcohol) 3gII, 8BB latex (styrene butadiene)
At 6%, I was able to obtain a set of 3 sheets of fc, including 3 sheets and a set of 3 sheets with a combination of 8 and 10 sheets.

When I used a commercially available bottom paper (Mitsubishi Non paper bottom, N-40) instead of this bottom paper, the adhesion inside the three sheets was good, but the adhesive between the two sheets was poor. Gaya\Bad Zorocking ``It was Mide.

Claims (1)

[Scope of Claims] L A base paper for non-cured copying paper that is coated with microcapsules or an acidic substance on one side, and is treated with non-smeared INK to make it water resistant and/or water repellent. It is characterized by the use of base paper. Curlless copy paper with improved printability. 2. The uncurled copying paper according to claim 1, wherein the smearing of the acidic substance is a partial smear (part coat). 1 Non-smeared [K is treated with water resistance and/or water repellency,
The uncurled copying paper according to claim 1 or 2, wherein I[rK to be smeared later is not treated to be water-resistant and/or water-repellent.