JPS5942865B2 - transparent paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a second method for forming an image using an electrostatic copying machine.
The present invention relates to an original paper, and more specifically, to a second original paper that has excellent heat resistance and good transportability during heat fixing.

Conventionally, the paper used for this purpose is tracing paper made by beating cellulose pulp to a highly viscous state, or relatively opaque paper containing oily substances, resins with relatively low softening points such as polybutene, and alkanol-modified paper. It is impregnated with a thermosetting substance such as amino resin.

By the way, tracing paper is the most widely used paper, but it is extremely sensitive to humidity, has poor dimensional stability, and is prone to curling.

Furthermore, it is weak in heat fixing and has many drawbacks in water resistance and tear strength. On the other hand, the second original paper impregnated with an oily substance or a thermoplastic resin with a low softening point as a transparency agent does not have these disadvantages, but has the disadvantage of staining the heat fixing roll or the pressure fixing roll. Moreover, it has many disadvantages such as easy migration of the transparentizing agent and easy formation of creases. Furthermore, even if a thermoplastic resin with a high softening point is used, it does not have sufficient heat resistance and has a strong adhesive force, which can cause the paper to wrap around the fixing roll and cause jams (a phenomenon in which it gets stuck and does not move), resulting in extremely poor conveyance. worsens. Alkanol-modified amino resins are not suitable for dry electrostatic copying machines because they generate formalin during heat fixing. In order to improve these drawbacks, the present inventors investigated various clarifying agents, and found that when using a vinyl copolymer that cross-links polymers through a chelate reaction, heat fixability is improved. It has been found that a second original paper sheet with excellent transportability and excellent transportability can be obtained.

That is, by incorporating a part that can form a complex into a part of the clarifying agent polymer and introducing a metal into it, it is possible to form intermolecular bridges, thereby increasing the polymerization and improving heat resistance.

The main coordination groups used in polymer chelate formation are as follows, and these are incorporated into vinyl copolymers such as acrylic esters, methacrylic esters, styrene vinyl chloride, and vinyl acetate. Just introduce it.

Examples of coordination groups include etc.

The metals that form chelates include almost all kinds of metals, but typical ones include zinc, iron, nickel, cobalt, copper, calcium, barium, manganese, aluminum, lithium, and sodium.

The method of introducing the coordination group into the molecule is not particularly limited, and for example, a method of first forming a polymer such as polyvinyl alcohol and then introducing the following coordination group by transesterification, or There are methods such as direct copolymerization or graft polymerization of coordination group-containing monomers such as.

What is even more surprising is that these chelate polymers have relatively good transparency when used alone; however, in order to improve the layer transparency, a large amount of a low molecular weight compound with a molecular weight of 2000 or less and a liquid or low melting point was blended. Even in cases where heat resistance is not deteriorated, it exhibits excellent transparency and transportability. These blend compounds include, for example, seurose acetate isobutyrate (molecular weight 845, viscous substance)
, polypropylene glycol glyceryl ether, low molecular weight clarifying agent (Vistex Φ141 manufactured by Chukyo Yushi KK)
etc. However, depending on the product type, these low molecular weight compounds must be used with caution because when mixed with the chelate polymer in an equal or greater amount, the heat resistance will rapidly deteriorate. When the amount was less than the same amount, almost no deterioration in heat resistance was observed. Furthermore, the tendency to crease, which is observed when a low molecular weight compound is used as the main clarifying agent, did not occur, and no whitening was observed even when it was strongly bent. This seems to be because the chelating agent also acts on the cellulose fibers and forms a strong bond with the cellulose. In addition to the above composition, it is also effective to appropriately add auxiliary agents such as antistatic agents, colorants, and mold release agents, if necessary. In the present invention, the method for impregnating paper with the above-mentioned clarifying agent composition is not particularly limited, and any method such as a deep squeeze method, a roll coating method, an air knife method, a wire bar method, etc. can be used.

The amount of impregnation is suitably 5 to 80% by weight based on the base paper depending on the desired degree of transparency, and the transparency improves as the amount of impregnation increases. In this case, even if the amount of impregnation increases, it has the advantage that it does not cause contamination of the fixed roll or deterioration of conveyance properties as seen with other clarifying agents. Drying after application requires only that the solvent be removed, and there is no need for operations such as curing after application, so the process can be quickly dried in a dryer, which is economical as it can speed up the process.

Another feature of the clarifying agent of the present invention is that there is no limit to the pot life, so unlike two-component and one-component urethane resins and epoxy resins, there are no manufacturing restrictions and it is extremely productive in this respect. It is. In other words, not only two-component urethane but also one-component curable urethane resin (moisture curing type) has a lifespan of only a few hours, which increases the complexity of the manufacturing process, and the resin liquid leaks during manufacturing. It is always in danger of gelling. In the case of epoxy resins and other thermosetting resins, the actual situation is that liquids whose curing speed has been increased to substantially complete curing in the dryer of a coating machine can only have a pot life of several hours. A number of features of the present invention have been described above, and will be explained in more detail below with reference to Examples.

Example 1 Pulp consisting of 20 parts of NBKP and 80 parts of LBKP was
Thermorak ST-105 (
It was impregnated with a 30% solution of acrylic chelate polymer (manufactured by Soken Kagaku Co., Ltd.) in toluene and ethyl acetate, and dried to a solid content of 99/m2.

The solder transparency of the obtained transparent paper was 48%.

This transparent paper has very good heat resistance, and when it was sandwiched between mirror-finished metal plates and hot pressed at 18"C, there was no blocking between the transparent papers and no contamination of the mirror-finished plates was observed. Furthermore, when the image was reproduced using a Xerox 2400 dry electrostatic copying machine (manufactured by Fuji Xerox Co., Ltd.), there was no toner offset to the regular roll section (temperature 19°C) and no roll contamination by the clarifying agent. 5,0
Even after passing 00 sheets, no conveyance trouble occurred.

On the other hand, for comparison, a thermoplastic acrylic resin (Dyanal LR-469 manufactured by Mitsubishi Rayon Co., Ltd.) was used as a clarifying agent.
Physical properties of transparent paper prepared in the same manner as in Example 1 using thermosetting acrylic resins (Dyuraclone RE-377, manufactured by Mitsubishi Rayon Co., Ltd., and Acridik A-810, manufactured by Dainippon Ink Co., Ltd.) were as shown in Table 1.

From this, the transparent paper according to the present invention not only has good transparency, but also
It can be seen that the conveyance property during paper passing is very excellent. Example 2 Pulp consisting of 10 parts of NBKP and 90 parts of LBKP was
Thermorack ST-10 is used on sizeless high-quality paper with a transparency of 3070 and a solder weight of 559 m2, which is beaten to SR and made into paper.
5 (acrylic chelate polymer manufactured by Soken Chemical Co., Ltd.) and a mixed solution of sucrose acetate isobutyrate (solid content concentration 35%) at the ratio shown in Table 2, dry weight 79/Rrl
It was coated and impregnated.

Table 2 shows the physical properties of the obtained transparent paper.

As shown in Table 2, even when a low-molecular-weight viscosity clarifying agent was blended with the aim of further improving transparency, the deterioration of heat resistance was unexpectedly small and the transparency was excellent. Despite this, it was possible to obtain transparent paper that has extremely good transportability in a dry electrostatic copying machine.

As an experiment, transparent resins were prepared in the same manner as in Example 2 using a common thermosetting acrylic resin, Duracron RE-377 alone, and an 80/20 blend of RE-377 and Schutrose acetate isobutyrate as clarifying agents. with paper,
Solder with transparency of 38% and 41% was tested on the 180th sheet (
Jamming occurred in both the diyuraclone (alone) and the second sheet (blend), and the conveyance properties of the sheet were significantly deteriorated due to the shake rose acetate isobutyrate blend.

Example 3 909 polyvinyl alcohol (saponification degree 75%)
Mix with ethyl benzoyl acetate of 009 and heat the mixture in a 11 three-hole flask equipped with a mechanical stirrer and a thermometer condenser.

This mixture was heated to 150-170°C in an oil bath until 36 ml of distillate was obtained, and the resulting gel was purified by extraction with ethanol, water, and acetone, and then dissolved in dimethylformamide. dissolve. This vinyl alcohol/vinyl benzoyl acetate copolymer forms a chelate with aluminum. The obtained chelate polymer (
The transparent paper obtained by impregnating and drying 539/7TI high-quality paper with 35% solids concentration and attaching it to 99/m" had a solder transparency of 45% and, as in Example 1, was extremely heat resistant. When copies were made using a BM type dry electrostatic copying machine (manufactured by IBM), there was no toner offset to the viewing roll, and there was no staining of the viewing roll due to the clarifying agent.
There was no transport trouble even when 5,000 sheets were fed.Example 4 Methacryl acetylacetone of 100θ and methyl methacrylate of 9009 were mixed in a sealed container at 100°C for 12 hours in the presence of 0.3% benzoyl peroxide. Bulk copolymerize.

The obtained product was purified by dissolving it in benzene and precipitating it with methanol. This methyl methacrylate/methacrylacetylacetone copolymer forms a chelate with zinc. Transparent paper was produced using the obtained chelate polymer in the same manner as in Example 3, and it had good heat resistance as in Example 3, and could be transported even when 5,000 sheets were passed through a BM type copying machine. No troubles occurred. Example 5 Methyl methacrylate JMoV Sound 80 parts of n-butyl methacrylate, 10 parts of styrene, 3 parts of acrylic acid, and 2 parts of itaconic acid were polymerized in isopropyl alcohol under reflux to obtain a polymer with a molecular weight (average) of 7,000. A copolymer was obtained.

100 parts of the above copolymer (solid content ratio), 5 parts of triisopropoxyaluminum as a crosslinking agent, 3 parts of acetylacetone as a stabilizer
1 part, 2 parts of ethyl acetoacetate, and toluene/MEK.
A solution with a concentration of 35% was prepared, and the same base paper as in Example 2 was impregnated with the solution to a dry weight of 89/d.

Claims (1)

[Scope of Claims] 1. Transparent paper made by coating or impregnating paper with 5 to 80% of a transparency agent whose main component is a chelate polymer made of a vinyl copolymer that crosslinks polymers through a chelate reaction. . 2. A transparentizing agent made by mixing a chelate polymer made of a vinyl copolymer that crosslinks polymers through a chelate reaction with a low molecular weight clarifying agent in an amount equal to or less than the weight ratio of the polymer is applied to the paper. Transparent paper coated or impregnated with 5 to 80%. 3. The transparent paper according to claim 2, wherein the low molecular weight clarifying agent is sucrose acetate isobutyrate.