JPS5893064A - Transparent paper for electrostatic copying - Google Patents

Abstract

PURPOSE:To reduce curling and to improve the correctability of toner images by adding cationic synthestic resin emulsion internally and making paper. CONSTITUTION:The transparent paper which is produced by adding a cationic synthetic resin emulsion internally is used. The emulsion is of polymers of vinyl acetate, PVC, styrene, acrylate and butadiene or copolymers contg. these monomers as constituting units. The emulsion copolymerized with unsatd. acids or hydroxyl groups such as hydroxyethyl methacrylate in order to improve writing quality of water pens or the like may be used.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transparent paper for electrostatic copying, and more particularly to a transparent paper particularly suitable as a second original for an electrostatic copying machine.

Conventionally, the transparent paper for the second original used in electrostatic copying machines is (I) Natural Tracing Beano e-mata which is made by highly beating pulp, and the Natural Tracing Paper is further made by polymeric material. Processed tracing paper s (2
) Transparent paper made of base paper made of oils, plasticizers, etc. as main ingredients and treated with a 9-clarifier, (3) base paper made of 7-no-alkyd resin,
Examples include transparent paper coated or impregnated with a polymeric substance such as acrylic resin, urethane resin, or styrene-ruic anhydride resin dissolved in an organic solvent.

However, the above (1) is used in some low-speed and medium-speed electrostatic copying machines, and has some advantages such as high transparency and good correction ability of one toner with correction fluid. When this is used in a dry electrostatic copying machine, blisters are likely to occur in the heat fixing section, and tracing paper has very poor dimensional stability due to changes in moisture and curls a lot, so it can cause paper jams, especially in high-speed copying machines. The problem is that this phenomenon often occurs. Items listed in (2) above may cause shimmering during storage or due to the heat inside the electrostatic copying machine.
The drawback is that plasticizers and the like soften the toner and often cause blocking phenomena. Furthermore, although the paper in item (3) above has good paper running properties in an electrostatic copying machine,
It has the defect of not being highly transparent.

In addition, in general, transparent paper coated or impregnated with polymeric substances does not necessarily have good correction properties with correction fluid, and requires surface equipment for processing such as coating or impregnating. The disadvantage is that it is complex to manufacture and relatively expensive.

It is an object of the present invention to solve the above-mentioned defects and to provide an electrostatic toner that has less curling, has good paper running properties, has good correctability for one toner, and can be manufactured at low cost. Our objective is to provide transparent paper for copying machines.

That is, the transparent paper for electrostatic copying of the present invention is characterized in that it is made by adding a cationic synthetic resin emulsion therein.

The present invention will be described in more detail below. A cationic synthetic resin emulsion is internally added to a rally and the paper is made into a paper.

The pulp used here is NBKP.

General vegetable pulp such as LBKP is mentioned, and the beating k is 450~z-00m/(CFS) preferably 350~2
5011 (CFS) is suitable.

In addition, the cationic synthetic resin emulsion used here contains -1 or 2 or more of polymers such as vinyl acetate, vinyl chloride, styrene, acrylic ester, butadiene, or copolymers containing constituent units of these monomers. can give. Furthermore, in order to improve the writability of aqueous benzene, unsaturated acids such as acrylic acid, methacrylic acid, maleic anhydride, itaconic acid, or hydroxyl groups such as hydroxyethyl methacrylate may be copolymerized. .

The amount of cationic synthetic resin emulsion added is 1 pulp
5 to 150 parts by weight per 00 parts by weight, preferably 10 to 1 parts by weight
Approximately 00 heavy background area is appropriate. If it is less than 5 parts by weight, the transparency will be insufficient, whereas if it is more than 150 parts by weight, problems such as blocking will occur and the writability will be reduced, resulting in dullness. □Ding.

In addition to these ingredients, (a) commonly used sulfuric acid,
? (b) Inorganic pigments such as zinc oxide, kaolin, talc, calcium carbonate, etc. to improve the recordability, E → conductive agents to control the electrical resistance of transparent paper (e.g. cationic It is desirable that an appropriate amount of trimethylammonium chloride, etc.) be blended. however,
The amount of the conductive agent (c) added is preferably in the range of 1 to 20% by weight based on the cationic resin emulsion (solid content).

In fact, in order to produce the transparent paper of the present invention, one or more of the above (a), (b), and (c) are added to the cationic synthetic resin emulsion or filtrate in the lupus slurry, The paper can be run on a paper machine, and the transparency can be further improved by running it on a super calender after papermaking. Furthermore, cationic melamine formaldehyde resin or polyamide may be used together with the cationic synthetic resin emulsion or in the fixing roller of an electrostatic copying machine.

It may be possible to consider a means of crosslinking the synthetic resin by supplying a shrimp chlorhydrochloride resin, a urea formaldehyde resin, or the like.

The transparent paper thus obtained is suitable as a second original for electrostatic copying, and can fully achieve the purpose of the present invention.

Examples are shown below, in which all parts are by weight.

Example I LBKP was beaten to a pulp slurry of 300 m (CFS). Add to this a cationic synthetic resin emulsion (Cal I xyl-modified polyacrylic ester resin, solid content 40%, manufactured by Showa Kobunshi ■, trade name Polysol AM-
2386) was added in a solid content ratio of 40% by weight based on Nonolube, and paper was made using a Fourdrinier paper machine to produce paper with a basis weight of 5211/yrl. In addition, this paper super car is 50 o'clock /
Perform calendering with crn linear pressure to achieve transparency of 6.
A 5% transparent paper (product 1 of the present invention) was obtained.

Example 2 LBKP was beaten to a pulp slurry of BooMl (CFS). To this, a cationic resin emulsion consisting of the following formulation was added at a solid content ratio of 30% by weight based on the valve, and the paper was processed using a fourdrinier machine and a super calender for 50 minutes.
Calendering was performed at a linear pressure of 0#CIi/crII to produce transparent paper (product 2 of the present invention) with a transparency of 62%.

Example 3 LBKP was beaten to a beating degree of 30'Om (Cr2) to obtain Nonolube slurry. To this was added 30% by weight of cationic resin emulsion carbonate and internal additives based on the solid content ratio based on the following formulation, and the paper was made using a Fourdrinier paper machine to produce a paper with a basis weight of 529.
/d paper was then calendered using a super calender at a linear pressure of 5011J151 to obtain a transparent paper with a transparency of 63% (Product 3 of this invention).

Cationic acrylic acid ester resin emuldimine (40
% dispersion, Showa Kobunshi KK Fissure, trade name Polysol AM
-200 parts 2386) Example 4 LBKP was beaten to a degree of beating of 300 d (Cr2) to obtain a No. 9 lube slurry. A cationic resin emulsion and internal additives having the following formulation were added to this in a solid content ratio of 50% by weight based on the pulp, and the paper was made using a Fourdrinier paper machine, with a basis weight of 529/d.
This paper was further calendered using a super calender at a linear pressure of 50 to 9/c1n to obtain a transparent paper (product 4 of the present invention) with a transparency of 60%.

Cationic acrylic acid ester emulsion 7 (4-0%
Dispersion liquid, manufactured by Showa Kobunshi ■, product name Polysol 20
0 AM-2381) The evaluation results of these transparent papers are summarized in Table 1.
As clearly shown in Table 1, the product of the present invention was found to be superior to the conventional product.

○ The corrected area is not stained and the corrected area is clearly visible on the diazo copy. Δ There is a slight stain in the corrected area. There are also slight correction marks on the diazo copy.

× The correction area is black and cannot be corrected.

*2) Paper jam evaluation; do not have.

*3) Copy quality evaluation: Δ There is some disturbance in the 1 line due to toner heat dissipation.

Claims (1)

[Claims] 1. Transparent paper for electrostatic copying made by internally adding a cationic synthetic resin emulsion.