JPS60185954A - Sheet-shaped dielectric material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of Application The present invention has a form such as a separate sheet, a continuous web, or a roll (hereinafter collectively referred to as "sheet material"). The present invention relates to a sheet-like dielectric material, and relates to a sheet-like dielectric material particularly suitable for use in, for example, an electrostatic printer device or an electrostatic plotter device (sometimes referred to as an electrostatic printing device).

BACKGROUND OF THE INVENTION In electrostatic printing/plotting methods, an image is formed on a sheet of material with a dielectric coating.

As such sheet-like materials, dielectrically coated dielectric or polyester films are usually used. The dielectric coating sheet is threaded through a fixed write hand having equally spaced conductive needles. When a computer-generated signal is transmitted to the needle, the needle induces an electrostatic charge on the paper at its point of contact.

A toner is then applied to the sheet material, and toner particles adhere to the electrostatically induced areas to form a durable, high contrast image.

PROBLEM SOLVED BY THE INVENTION Sheet dielectric materials conventionally used in electrostatic printer/block devices are typically coated with a surface layer that has a greater affinity for toner than the polyester itself. polyester films with a continuous narrow strip of carbon particles on each film. The application of such carbon strips is expensive to process and therefore carbon-edged dielectric printed films are very expensive materials.

In view of the above-mentioned problems of conventional sheet-like dielectric materials, an object of the present invention is to provide a sheet-like dielectric material that does not have carbon strips on both longitudinal edges and can be used in electrostatic printers and electrostatic plotters. shall be.

SUMMARY OF THE INVENTION The sheet dielectric material of the present invention comprises a first coating of a cationically conductive polymer and a second coating of a polymeric material having an affinity for electrostatic printing toners. The dielectric material is composed of a sheet-like dielectric material consisting of a sheet-like or film-like substrate each having a coating.

Example The above sheet-like substrate, i.e., base sheet or film, is
It may be made of any material and may be transparent, translucent or opaque. The entire base sheet or film or a portion thereof may be electrically conductive or non-conductive.

The second coating, the top coat, may cover the entire area of the first coating of cationically polymerized polymer.

Also, especially if the base sheet is non-conductive, a strip of cationic polymer on one or both ends of the sheet material may not be covered with a second coating along the length of the sheet material. It is also a good idea to leave it there.

Examples of the base non-conductive material include polyethylene terephthalate (polyester) film or nylon film. Partially conductive materials include polyolefins. Conductive materials include, for example, paper and various paper-like synthetic resin materials made by biaxially oriented and at least partially whitened with polyolefin materials such as polyethylene or polypropylene. Examples of such paper-like materials include Synteape, Yubo (
Examples include materials commercially available under the tradenames Yupo and Polyart.

Examples of the cationic conductive polymer used in the present invention include polyvinylbenzyltrimethylammonium chloride, polydiallyldimethylammonium chloride, poly(2-methacryloyloxyethyltrimethylammonium chloride), poly(N-acrylamidopropyl-3-trimethyl ammonium chloride),
Poly (N.

N-dimethyl-3,5-methylenepiperidinium chloride), poly(4-vinyl-N-methylpyridinium chloride), quaternized polyethyleneimine and trimethylamine derivatives of polyepichlorohydrin. Examples include high molecular weight polymers containing nitrogen-containing salts.

Preferably, the conductive polymer is applied in the form of an aqueous solution containing a small amount of organic solvent. The thickness of the coating applied should be sufficient to form a uniform, continuous coating on the surface of the base sheet or film, avoiding surface irregularities such as those caused by fibers protruding from the surface of the paper. It is preferable to apply the coating to a thickness that eliminates all unevenness and provides a flat surface.

The amount of polymer applied in the dielectric coating is 0.8-2.5g
/m2 is preferable. Similarly, the thickness of the knob coat should be such that it provides uniform and continuous coverage of the surface of the dielectric coating. Preferably, the amount of polymer applied to the top coat is between 4 and 10 g/m''.

The topcoat may be formed from any soluble film-forming polymeric material that provides affinity for the toner particles. Examples include any one of vinyl acetate copolymers, polyvinyl butyral, styrene polymers or copolymers, thermoplastic polyesters, or a mixture of two or more of these polymers. The top coat is
The coating is preferably a soluble linear thermoplastic copolymer ester, and a copolymer ester comprising a polybasic aromatic acid and an aliphatic polyhydric compound is particularly preferred.

The topcoat polymer has a relative humidity of 100 to 2'0%
It has a surface resistance of 5000 MΩ/mouth, preferably 5 to 150 MΩ/mouth at 50% relative humidity, and 500
The charge acceptor using a corona bar is 200-490 cm, and the charge decay rate is 6-20 V/sec.

These high molecular weight polymers include, for example, methyl ethyl ketone, toluene, and ethanol. It can be applied in the form of a solution of a fM medium or a mixture of isolvents. The above-mentioned high molecular weight polymer may be used by adding a small amount of other resin, or may be used together with a small amount of filler such as silica filler.

The conductive coating and top coat can be applied using any desired technique, such as air knife, Mayer-Rondo, roller,
It can be applied by a trailing blade method, a gravure method, or the like.

According to the present invention, it is possible to provide a dielectric sheet that can be used in an electrostatic printer device or an electrostatic proter device, and in particular has a polypropylene base. Previously, it was not possible to form electrostatic images on such propylene materials. Paper-like polypropylene sheets are inexpensive compared to polyester films, and in particular significantly cheaper than carbon-lined polyester films. Furthermore, it can be used as a translucent or opaque sheet. Therefore, compared to the prior art, the present invention represents a considerable technical inventive step.

Furthermore, the present invention allows images to be formed on synthetic resin materials using electrostatic printer/plotter devices designed to use only paper.

Hereinafter, the present invention will be explained with reference to specific experimental examples. The conductive coating and topcoat formulations are as follows.

(1) Water 95 parts by weight Water 95 parts by weight Water 94 parts by weight Silica 1 part by weight Top coat (1) Vinyl acetate copolymer 30 parts by weight Toluene 40 parts by weight Ethanol 25 parts by weight Silica 5 parts by weight Top coat (2 ) Thermoplastic polyester 30 parts by weight Toluene 40 parts by weight Ethanol 25 parts by weight Silica 5 parts by weight Top coat (3) Polystyrene (low molecular weight) 20 parts by weight Polyvinyl butyral 10 parts by weight (Monsanto Butival B72 molecular weight 200,000) Silica 5 parts by weight Toluene 50 parts by weight Methyl ethyl ketone 15 parts by weight Top coat (4) Polystyrene (low molecular weight) 10 parts by weight Thermoplastic copolymer ester 20 parts by weight Silica 3 parts by weight Methyl ethyl ketone 67 parts by weight Top coat (5) Soluble polyvinyl chloride - Vinyl acetate Copolymer 30 parts by weight Silica 3 parts by weight Toluene 40 parts by weight Methyl ethyl ketone 27 parts by weight Cationic coating components 1.2 and 3 were applied to polyethylene terephthalate film, polypropylene film and paper in an amount of 1.5 g/rJ using the air knife method. Coated on the synthetic resin material Polyart ■.After drying the conductive coating,
Topcoat formulations 1-5 were each applied to the individual coated samples using the air knife method in an amount of 7.5g 1rd. In each case, sheet dielectric materials were obtained which had properties very suitable for electrostatic printing machines.

As described in detail, according to the present invention, it is possible to provide an inexpensive sheet-like dielectric material suitable for use in an electrostatic printing device.

Agent: Masaru Ueya Yoshio Tsuneko Continued from page 1 0 Inventor: John William Φ Essetsumaning, United Kingdom Toosys Oractone @ Applicant: Norman Reginal British Parliament Essecude Gilbert Clu Barrow Grove Hook Applicant: John William, United Kingdom, Essetcmaning, Toosys Clactons, Clacton - 106, Sen Road, On Sea, St. Colchester, Little Wig Arm House (no address), St. Clacton - 106, Sen Road, On Sea

Claims (1)

[Claims] 1. A sheet-like substrate is provided with a first coating made of a cationic conductive polymer and a second coating made of a polymeric material having an affinity for electrostatic printing toners. Sheet-like dielectric material. 2. The sheet-like dielectric material according to claim 1, wherein the first coating is a coating of a polymer containing quaternary nitrogen atoms. 3. The first coating is polyvinylbenzyltrimethylammonium chloride, polydiallyldimethylammonium chloride, poly(2-methacryloyloxyethyltrimethylammonium chloride), poly(N-acrylamidopropyl-3-trimethylammonium chloride), PolyJ (N.N-dimethyl-3,5-methylpiperidinium chloride), poly(4-vinyl-N-methylpyridinium chloride), from trimethylamine dielectrics of quaternized polyethyleneimine and polyepichlorohydrin. The sheet-like dielectric material according to claim 2, which is a coating consisting of at least one type selected from the group consisting of: 4. The thickness of the coating is sufficient to form a continuous coating on the surface of the sheet-like substrate, and uniform voltage application occurs over the entire coated surface of the sheet-like substrate. A sheet-like dielectric material according to any one of claims 1 to 3, configured as follows. 5. The sheet-like dielectric material according to any one of claims 1 to 4, wherein the second coating comprises a soluble film-forming polymer. 6. Claim 5, wherein the second coating is a coating made of at least one member selected from the group consisting of vinyl acetate copolymer, polyvinyl butyral, styrene polymer or copolymer, and thermoplastic polyester. Sheet-like dielectric material described in Section. 7. The sheet form according to claim 6, wherein the second coating is a coating of a linear thermoplastic copolymer consisting of a polybasic aromatic acid and an aliphatic polyhydric compound. dielectric material. 8. At least a part of the sheet-like substrate is non-conductive, and on at least one edge of the sheet-like substrate, the strip-shaped edge of the first coating that is not covered with the second coating is arranged as described above. The sheet-like dielectric material according to any one of claims 1 to 7, which remains along the longitudinal direction of the sheet-like substrate. 9. The sheet-like dielectric material according to claim 8, wherein the sheet-like substrate is made of polyethylene terephthalate, nylon, or polyolefin. 10. Any one of claims 1 to 7, wherein the entire sheet-like substrate is electrically conductive, and the second coating covers the entire area of the lower coating including the first coating. The sheet-like dielectric material according to item 1. 11. The sheet-like dielectric material according to claim 10, wherein the sheet-like substrate is made of paper or a paper-like material. 12. The sheet-like dielectric material according to claim 11, wherein the sheet-like substrate is made of a paper-like synthetic resin material produced by bidirectionally orienting polypropylene or polyethylene and subjecting it to stress whitening.