JPS6033559A - Paper used for electrostatic plotter - Google Patents

Abstract

PURPOSE:To obtain paper superior in recording characteristics at low cost with two steps by porviding a dielectric recording layer on a conductive paper base prepared by adding a conductive agent to beat pulp in a paper making step. CONSTITUTION:A conductive agent, such as polyethyleneimine hydrochloride or conductive tin oxide, and a sizing agent when needed, are added to viscous pulp beat to a Canadian Standard Freeness of <=50cc, then, paper is made, and treated by calendering. The obtained conductive paper base having a density of >=0.95g/m<3>, a smoothness of >=20sec, and a volume intrinsic resistivity of 5X 10<6>-5X10<9>OMEGA.cm is coated with a coating soln. contg. an insulating resin, a writability improving powder, etc. to 1-10g/m<2> to form a dielectric recording layer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic plotter paper with improved recording properties.

In the electrostatic recording method, pressure pulses are applied from the front, back, or both sides of electrostatic recording paper, which has a dielectric recording layer made of insulating resin or the like on one side of a support that has been subjected to conductive treatment. Method,
Chirui is a method in which an electrostatic latent image is formed on the recording layer by a method such as transferring an electrostatic latent image formed on another original plate, and this is made visible using colored powder (toner or developer). . This method has particularly high speed and resolution, and has been used in facsimile printers.

In recent years, automatic design and production apparatuses using computers have rapidly developed, and the X-Y plotter, which is a hard copy apparatus thereof, is also required to be faster and more labor-saving. These X-Y plotters.

A pen-contact type has been used for a long time, but the pen-contact type has a slow response time and is unsatisfactory to the high speed requirements, so electrostatic recording is being adopted as an alternative.◇ Such electrostatic recording The paper used for plotters is
Currently, electrostatic recording paper for regular facsimile printers is used instead, and paper suitable for plotters is desired.□The head system used for plotters is the same as that for facsimile printers. ,facsimile·
Compared to printers, the applied voltage is higher and the car is more expensive, so electrostatic recording paper must be of suitable quality. or.

The recording layer is often much wider than that of facsimile printers, and since they are used more frequently, there is also a need for lower running costs.

In view of the current situation, the inventors of the present invention have conducted intensive studies and succeeded in obtaining electrostatic plotter paper with excellent recording properties1.
5. That is, it is made from pulp beaten under Canadian Standard Freeness 500 cc Jυ, has a density of 0.05 f/d or more, and is smoothed for 20 seconds, and has been given an organic polymer electrolyte or/and metal oxide semiconductor by internal addition or surface treatment. that's all.

Body-beak specific resistance value 5 x 10' to 5 x 10' Ω - Electrostatic plotter paper characterized by providing a dielectric recording layer on the conductive base paper of the mouth Conductive base used in the present invention is used to make viscous pulp obtained by beating pulp commonly used as wood pulp, such as kraft pulp, raw sulfuric acid pulp, and semi-chemical pulp, to a Canadian Standard Freeness of 500 cc or less.

Organic polymer electrolyte or/and metal oxide semiconductor.

If necessary, apply a sizing agent or other surface treatment such as inner foil or size press or coating to make it water resistant and resistant, as well as impart desired conductivity. It is in a state of close continuation after being processed.

Examples of organic polymer electrolytes used as conductive agents include, but are not limited to, polyethyleneimine hydrochloride, poly(N-methyl-4=vinyl pyridium chloride), and poly(2-metalloyl-oxyethyltrimethyl). ammonium chloride), poly(2-hydroxy-8-methacryloyloxypropyltrimethylammonium chloride), poly(N-acrylamidopropyl 8-trimethylammonium chloride).

Poly(N,N-dimethyl-3,5-methylenepiperidium chloride), dimethyldiallyl ammonium chloride copolymer, polyvinyltrimethylammonium chloride, polyallyltrimethylammonium chloride, polyvinylbenzyltrimethylammonium chloride, N-polyethyl methacrylate Quaternary ammoniums such as N,N-diethyl-N-(α-vinyl)benzylammonium chloride), N-polyethylmethacrylate)-N,N-diptyl-(α-vinyl)benzylammonium chloride, etc. cationic conductive agents such as salts, sulfonium salts such as poly(2-acryloxyethyldimethylsulfonium chloride), phosphonium salts such as poly(glycidyltributylphosphonium chloride), polymethacrylic acid carboxylate, polyacrylic acid carboxylate, polystyrene sulfonate , polyvinyl sulfonate.

Anionic conductive agents such as polyvinylphosphonate are appropriately selected and used.

Examples of metal oxide semiconductors that can also be used as guide boxes and agents include, but are not limited to, conductors, tin oxide, and zinc oxide doped with aluminum oxide and fired in a reducing atmosphere. In addition, examples of sizing agents that can be used as needed include:
Copolymer of styrene and 2-methacrylate 1) loyloxyethyldimethylbenzylammonium chloride, lauryl methacrylate and N-methyl-4,-vinylpyridine 11
Copolymer with 7-muchloride.

Copolymer of vinylnaphthalene and hebenzyl-4-vinylpyridium chloride, co-M compound of styrene, stearyl methacrylate and 2-methacryloyloxyethyltrimethylammonium chloride, vinyltoluene and N-butyl-2-methyl- The sizing agent is appropriately selected from among cationic sizing agents such as copolymers with 4,-vinylpyridium chloride, nonionic sizing agents such as paraffin, wax, and petroleum resins, and anionic sizing agents such as rosin.

The 1st body layer used in the present invention is an insulating layer that retains latent 1st electric charges, and is mainly composed of an insulating resin. It is made by adding powder or the like to give it practical properties such as imprintability. Examples of insulating resins include alkyd resins, silicone resins, epoxy resins, melamine resins, phenol resins, polystyrene resins, vinyl chloride resins, vinylidene chloride resins, vinyl chloride/vinyl acetate copolymer resins, and styrenated alkyd resins. , styrene-butadiene copolymer resin, polyacetal resin, polybutyral resin, saturated or unsaturated poly(I) ester resin, polyurethane resin, acrylic acid/methacrylic acid resin, etc. are used.

Powders used for the purpose of imparting practical properties such as mattness, writability, and stampability to the surface of recording paper include:
Oxides and hydroxides of zinc, titanium, magnesium, calcium, aluminum, etc.

Organic particles such as charcoal salt, pyrochloride, silica, polycarbonate resin, urea-formaldehyde resin, powder, etc. are used.

The dielectric recording layer of the present invention is prepared using a conventional dispersing machine such as an attritor, a ball mill, a homomixer, a sand grinder, etc. 1~ by construction method
It is coated onto a conductive monolithic base paper at a coating weight of 10 t/rrl.

According to the present invention, the rough part of an electrostatic plotter can be manufactured in two steps: (1) making a conductive base paper, and (2) coating a dielectric recording layer. Coating, ■Coating the conductive back coat layer, ■Coating the electric recording layer, or ■Making the base paper, ■Impregnating the conductivity imparting agent, ■d
It can be manufactured at a lower cost than the method of manufacturing in three steps of coating the award bowl body recording layer.

゛Although the concept of two-step, double-layered electrostatic recording paper as in the present invention has existed in the past, it has a quality that is unsuitable for practical use, such as the fact that each stroke hardly shows a single edge, and is not manufactured or sold for practical purposes. It is the aforementioned Nishi [r: Cheng (four-layer structure) or three-step electrostatic recording paper. According to the present invention, excellent mackerel recording properties can be obtained with a two-step, two-layer structure. Canadian Standard of the Invention
If the freeness exceeds 509 cc or the density is less than 0.95 cc.

When coating the dielectric recording layer, the coating liquid permeates the base paper, reducing the difference in resistance between the recording layer and the conductive layer, resulting in an unclear image. If the smoothness is less than 20 seconds, it is not preferable because a first-class defect of poor image quality is observed.

In addition, if the pulp is beaten to make a base paper with good transparency, and the dielectric layer is made with a powder with good transparency, such as silica or fine polycarbonate resin particles, to make electrostatic plotter back paper, it becomes transparent. Since electrostatic plotter paper for second original drawings with good properties can be obtained, according to the present invention, so-called plain paper and second opening paper can be manufactured depending on the purpose.

It's so bad.

Examples 1-5. Comparative Example 1-4 A cationic polymer electrolyte conductive agent and a cationic sizing agent were simultaneously added and adjusted to a viscous pulp beaten to the Canadian Standard freeness value shown in the table, and the paper was made and then calendered. Aromatic polycarbonate resin 20
A coating solution prepared by mixing and dispersing 80 parts of vinyl chloride/vinyl acetate copolymer resin with an Attritor C1X was coated using a control roll coater to give a dry coating thickness of 30.5 parts. After drying, an electrostatic plotter phase was obtained.

The thus obtained paper was recorded with an electrostatic plotter, and as shown in Table 1, in the example of the present invention, a recording surface with high recording density, little background staining, and good image quality was obtained.

[Margin below]

(10) Recorded images: Figures and characters were recorded using an electrostatic plotter machine Benson 9211.

Recording density: The recorded image area was measured using a Macbeth reflection meter TtD-501 (using Wratten #106 filter).

Background density: Measured 1 non-image using Macbeth reflection densitometer R, D-501 (using Wratten #106 filter) Image quality: Recording direction 1″4 visually determined.

○:) 1 good, Δ: Slightly rough.

×: It is rough.

Patent applicant: Koshiiri Co., Ltd. (12) 1'J7n- (11)

Claims (1)

[Claims] A paper made from a bulb beaten to a Canadian Standard Freeness of 500 cc or less, and has a density of 0.95 f/ctI or more and is provided with an organic polymer electrolyte or/and gold oxide semiconductor by internal addition or surface treatment. Smoothness 20 seconds or more 1 volume resistivity 5 x 10'~5
An electrostatic plotter paper characterized in that a dielectric recording layer is provided on a conductive base paper of ×109Ω.