JPH0382899A - Conductive base paper - Google Patents

Abstract

PURPOSE:To provide the subject base paper having a stable quality in a reduced amount of a conductive treating agent by coating the surface of raw paper with an aqueous pigment coating, drying the paper to form a water-resistant conductive pigment coating layer, and further disposing a cationic conductive polymer layer thereon. CONSTITUTION:An aqueous pigment coating containing a pigment, an adhesive and a water-resisting agent (e.g. melamine.formaldehyde resin) on the surface of raw paper and subsequently drying the coated paper to form a conductive pigment coating layer. A cationic conductive polymer layer is disposed on the coating layer to provide the objective base paper.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of Industrial IX] The present invention relates to a conductive base paper used for electrophotographic recording paper and electrostatic recording paper. In particular, the present invention relates to conductive base paper that uses a small amount of conductive treatment agent and has stable electrical resistance in terms of quality.

[Conventional technology]

Electrophotographic recording paper is made by applying zinc oxide, sensitizing dye, and adhesive to the surface of conductive base paper to form a photoconductor layer. On the other hand, electrostatic recording paper is made of an electrically conductive base paper made of an insulating resin such as vinyl chloride/hinyl acetate copolymer resin, acrylic acid or methacrylic acid copolymer resin, styrene resin, polynisder resin, etc. A conductive layer is provided by coating the surface of the material. These electrophotographic recording papers and electrostatic recording papers have little image unevenness and are suitable for recording with good resolution.As a conductive base paper, the volume electrical resistance changes with respect to environmental changes from low humidity to high humidity. It is required to be thin, strong, and highly smooth.

In general, conductive base paper is aluminum? I), 1: Laminated metal foil on paper, conductive carphone, metal powder, metal M (paper coated with or impregnated with aluminum),
Examples include those coated with aluminum vapor deposited, those coated with or impregnated with an inorganic ionic compound, and those coated with or impregnated with a conductive polymer.

However, the method using metal foil as laminate 1 has the disadvantage that the price of the metal foil is high, and that the metal foil and paper need to be pretreated when laminated to paper, resulting in a multiple A''t# process.

Those that use conductive powder are expensive because the powder itself is expensive.
Many of them are colored, and because they are used in conjunction with )% inter, they have the disadvantage of having a conductivity of 1-tIj and a 4-minute difference in effectiveness. The process requires high smoothness, low vapor deposition aptitude of 7 minutes, and is expensive due to pre-treatment of the paper. However, there are some interesting shortcomings in history.

Inorganic and ionic compounds 13. It is coated with and impregnated with salt, etc., and it is easy to cause the paper to sag under high humidity.The electric resistance value increases under low humidity, which does not have a negative effect on the image. Missing 7C that rusts the mechanical contract reputation
has a technical staff. 2. The conductive polymer compound has ionic properties and 5. For nonionic types, polyvinyl alcohol, polyethylene glycol, polyacrylamide, etc. are used, but they have little effect on imparting conductivity and have not been put into practical use for a long time. The anion type has an acid group and can only give a small to medium conductivity f:I, so it is not practical. The cation type has a polar group such as a primary ammonium salt, and has the greatest effect on conductivity.
Currently, this cationic conductive polymer compound is exclusively used for conductive base paper.

(Problem to be solved by the invention) However, even if conductive paper is used, the electrical resistance 11 of the conventional conductive base paper increases especially under low humidity, making it difficult to put it into practical use. There are few drawbacks, namely, humidity
In order to provide something practical at a low level, conductive polymer compounds must be made into large-width, IJ. Then, under high humidity, the electric resistance j/j'
is lower than -e-required (j(), and has the disadvantage that it is not possible to obtain a good image.

[Failure to solve the problem]

The inventors of the present invention conducted extensive research to solve these drawbacks of conventional conductive base paper, and as a result, succeeded in solving the problems and completed the present invention.

In the present invention, a water-retaining pigment sake bottle containing a pigment, an adhesive, and a water-resistant agent as a main component is coated on the surface of a raw material, and dried to improve water resistance. 1', a conductive face 111'A coating layer is provided ('l, then the conductive face f-1 coating layer -''-
The conductive material 1' is characterized by being provided with a thione-based conductive material 1-1-polymer f arsenide waste (a two-base paper).

fY use and aspects of the invention] The conductive base paper of the present invention has a water-resistant conductive pigment coating layer interposed between the base paper and the cationic conductive polymer compound layer as described above. This reduces humidity dependence and prevents electrical resistance from dropping more than necessary under high humidity.
It is intended to be As a result, it shows a stable electrical resistance value even when the light is exposed to a temperature of 150 degrees W or 5 degrees. It's reduced to 11.

The base paper used in the present invention has a basis weight of 30 to 2
00 gr 7m2 high-quality paper is suitable, and unbleached rough 1-paper, plain rough 1-paper, krasin paper, pure white roll paper, lightly coated paper, etc. can also be used. The base paper should be one with good sizing, and preferably water-resistant or water-based R.
It is desirable that it not affect the coating work of the size paint.

The surface of the base paper is coated with water containing pigments, adhesives, and waterproofing agents as main components, and is dried to have water resistance. The sphere layer is set up (
Get tired.

Then, this conductive pigment detection Ji4 is adjusted to have a volume electric resistance value of 109 to 1010Ω cllll.
It is necessary to select pigments, adhesives, and other components that make up +'+. As pigments, clay,
Calcium carbonate, talc, titanium oxide, magnesilano oxide, lead oxide, aluminum hydroxide, etc.
Paper, Yo 1 - It is possible to use pigments used in paper 1
11 coming. Adhesives include anionic and nonionic latexes, such as carboxy-modified styrene butadiene latex, acrylonitrile butadiene latex, methyl methacrylic butadiene latex, crosslinked acrylic emulsion, etc. can be mentioned. In addition, casein, polyvinyl alcohol, various added starches, carboxymethyl cellulose 5
．． Methylce/Ln~s and the like can also be used. In addition, dispersants and anionic conductive polymer compounds commonly used for dispersing pigments can also be used in combination. Furthermore, in order to impart water resistance, melamine poly/L7
× Lamin polyamide resin -9; ,, )) A water-resistant agent that cross-links with latex or 'K Weikan polymer compound is used.Water-based pigment paint-'J,7) y= .fIi is 5
−30 g +'/"II+", preferably 8 to 21) ξ1., ol or suitable. After coating the surface of the base paper with a water-resistant conductive pigment coating layer, it is applied to a super calacitor, etc.
・Ill is enough! It is very effective in terms of smoothness, t, 'J'L, and image conflict formation.

Next, the water-resistant conductive face 451 coating layer-1-, which is provided on the surface of the base paper in this way, is provided with a cationic conductive polymer layer and a composite layer.The present invention to 33
As the cationic conductive polymer compound used in this process, a quaternary ammonium salt type is used. The coating layer of the cationic conductive polymer compound is 01 to 2g+.
,/m2. This coating amount is 1% compared to the conventional method.
72 to 1/1 degree of conductivity can be achieved, and the effect of providing a layer of conductive pigment having water resistance on the surface of the base paper is fully expressed.

In addition, a conductive pigment coating layer is provided on one side of the base paper.In this case, a film-forming polymer compound layer such as polyhinyl alcohol or latex is provided on the non-coated side of the base paper to improve moisture resistance. It is effective for soil prevention by penetrating into the base paper layer when applying solvent-based photosensitizers or dielectric paints. Moreover, the supercalenter and gross calenter after providing the conductive polymer compound layer may be treated as necessary.

The conductive base paper of the present invention thus obtained is used for producing electrophotographic recording paper or electrostatic recording paper.

That is, for a conductive base paper with a conductive polymer compound layer on one side, a photoconductor layer or a dielectric layer is provided on the opposite side of the conductive pigment coating layer provided on the surface of the base paper. In addition, a conductive pigment coating layer is placed on both sides of the base paper, and a conductive polymer compound layer is placed on one side of the base paper. 9 Volume electrical resistance value of the conductive base paper of the present invention 06-1
()9Ω "■, 71 using the conductive base paper of the present invention
Recording paper and electrostatic recording paper are subject to environmental humidity lr'.
It was possible to obtain a good image with no image unevenness and a low degree of resolution.

〔Example〕

Further, the present invention will be explained by examples.

'ノGoh藏βi. '1 gn f-'l coating layer α silk composition weight parts sauce 100 triboli
acid soda
5 Carboxyl-modified styrene phtadiene latex 2571ζ-soluble melamishi Pol l\ Artehito (side fat 51 face 16
A water-based pigment paint with a composition of 1 coating layer and a solid content of 40% was prepared, and the basis weight was 60 g+''II+ using an air knife coater.
”I-, l 5 gr, / m2, on both sides of the textured paper.
/ One side was coated and dried to form a water-resistant conductive pigment coating layer, followed by superkidder treatment. Next, use a rod coater to coat both sides with a cationic material. A layer of 0.2 gr,'m'' of 1% solution of the anti-inflammatory polymer compound Kayakryresin FCl1103 (manufactured by Nippon Kayaku Co., Ltd.) was applied.
/Double-sided coating) 12 times to obtain the conductive base paper of the present invention.

Example 2 Pigment coating layer composition Part by weight Clay
70 calcium carbonate
30 Aron T-40 (manufactured by Toagosei Rhigaku)
1 Casein 10 Anionic conductive polymer compound Gocephaimer A-460 (manufactured by Nippon Gohsei 7) 1
Cariho A-modified Medyl methacrylphtadiene latex 20 Water-soluble Epo A resin 4 A 7) C pigment coating with a solid content of 35% was prepared using the above pigment coating layer composition, and coated with an air knife coater to give a basis weight of 150 g.
10g/m"/10gr/m"/each side was applied to both sides of the quality paper, dried to form a water-resistant conductive pigment coating layer, and then subjected to supercalentor treatment. Mayer Harini 1-ter is applied to both sides of the cationic conductive polymer F-arium compound Gemistat 63001-+ (
A solution of 32≦ (manufactured by Sanyo Kasei) was applied at a rate of 1 gr/m2/both sides and dried to form a conductive paper according to the present invention.

Seed Example 3 A single-sided product was made in Example 1, and the uncoated side of the base paper was coated with a density of 5?
5 polyvinyl alcohol amount 2g/I'11"
The conductive base paper of the present invention was obtained by coating and drying.

Example 4 In Example 2, the amount of conductive polymer compound applied on one side was 05g.
1.,/l112 was coated and dried to obtain the conductive base paper of the present invention.

Ratio 1 佼 1 row 1 tsubo it 81g+・, /'m2 1-7 quality paper in a size press conductive polymer compound Kayacrylic resin EC0O
Treated with 5% solution of 3, λI! Cloth - 3 g/m
A comparative conductive base paper of No. 2 was obtained.

Comparative Example 2 On both sides of a base paper with a basis weight of 183 gr, *Ill'', conductive polymer compound was coated with 5% of 1-6300H of conductive polymer using an air knife coater, dried, and the coating amount was 2 g.
r,/rn2/ A conductive base paper for comparison on both sides was obtained.

Example 5 In Example 2, conductive base papers of the present invention were obtained in which the coating amount of the conductive polymer compound 1 was varied.

Comparative Example 3 Example 2-1: Using textured paper and a conductive polymer compound,
A size press treatment was performed using the 52≦ solution to obtain comparative conductive iter base papers with different coating amounts.

Comparative Example 4 Comparative conductive base paper with different amounts of cypress cloth was prepared by applying a 5% solution of Example 2 using a bi-quality paper and a conductive polymer compound using an air knife coater and drying it. )Ta.

Comparative Example 5 A base paper with a basis weight of 183 gr/m2 was treated with a 5% solution of the conductive polymer compound Chemistats l-6300H using a size press, and a comparative conductive zeto-based paper with a coating weight of 3 gr/l112 was prepared. I got it.

Volume electrical resistance values were measured for the conductive base papers obtained in each Example and Comparative Example.

The measurement results are shown in the following table, and it can be seen that the conductive base paper of the present invention has no problems in quality compared to comparative products.

] 3 Table 1: Quality test results Table 2: Coating amount and volumetric electrical resistance (RH65%) 4: Table 3: Humidity and volumetric electrical resistance The base paper uses 1/2 to 1/10 the amount of conductive polymer compound used to obtain the same volume electrical resistance as conventional conductive base paper.
The effect is great. Furthermore, the humidity dependence that existed in the past has been greatly improved, and it can be clearly seen that the humidity dependence is small.

Therefore, its effects are immeasurable.

Claims (1)

[Claims] The surface of the base paper is coated with a water-based pigment coating mainly composed of a pigment, an adhesive, and a waterproofing agent, and dried to form a conductive pigment coating layer having water resistance. A conductive base paper comprising a cationic conductive polymer compound layer on the layer.