JPS59121339A - Electrostatic recording body for pressure fixing - Google Patents

Abstract

PURPOSE:To prevent a so-called offset phenomenon during pressure fixing without deteriorating the electrical characteristics of a toner and an electrostatic recording body for pressure fixing having a dielectric layer on one side of its electrically conductive support by treating the other side with a specified amount of a surface lubricant. CONSTITUTION:An aqueous soln. of polyvinylbenzyltrimethylammonium chloride or the like is applied to one side of fine paper and dried, and the treated side of the resulting electrically conductive support is coated with a dielectric layer contg. CaCO3 or the like dispersed in an insulating resin to obtain an electrostatic recording body for pressure fixing. A surface lubricant such as stearate, palmitic acid amide, paraffin wax or silicone oil is dissolved or dispersed in a medium, applied to the other side of the fine paper of the recording body by 2- 10g/m<2> dry weight, and dried. To said medium may be added an adhesive, a pigment, an electrically conductive substance, etc. Thus, an offset phenomenon by which a toner sticks to a pressure fixing roll is prevented, so maintenance is made unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic recording medium, and more particularly to an electrostatic recording medium for pressure fixing that exhibits excellent adaptability when pressure fixing powder images.

In the electrostatic recording method, voltage pulses are applied from the front, back, or both sides of the dielectric layer of an electrostatic recording medium, which has a dielectric layer made of insulating resin or the like on a support that has been subjected to N'f-electrical treatment. This is a method in which an electrostatic latent image is formed on a dielectric layer by transferring an electrostatic latent image formed on another original plate, and this is developed and visualized with toner, and is widely used in facsimiles, printers, etc. It is being

Methods for developing electrostatic latent images on such electrostatic recording materials are broadly classified into powder development methods and liquid development methods. In the powder development method, the recording material is generally developed with powder toner and then passed between heated rolls to thermally fix the powder image, which tends to cause fixing failures due to insufficient temperature at startup. Furthermore, as the speed of the device increases, it requires higher temperature heating, which poses a risk of fire. On the other hand, toner particles are dispersed in the solvent -U
In the liquid developing method using a liquid toner, the fixing properties of the l-toner are not necessarily sufficient, and since an organic solvent is used, there are disadvantages such as fire danger and odor.

In recent years, as a method to solve these difficulties, a method has been developed in which the recording material after powder development is passed between pressurized metal rollers, and the toner particles are deformed under pressure and fixed to the dielectric layer on the surface of the recording material. The so-called pressure fixing method is attracting attention.

However, in this pressure fixing method, the -g
B, 5<The toner particles adhere to the fixing metal roll, causing roll stains, and furthermore, the toner particles are transferred onto the recording medium again, causing a ghost image, which is a so-called phenomenon. There is a problem of doing so. As a countermeasure for this problem, in addition to improving the toner composition, such as improving the fixability of the toner particles or adding wax or the like to give the toner particles solidity on the metal roll, There are also 4' improvements in terms of equipment, such as constant cleaning to maintain the sub-type properties of the metal roll!
84. However, these improvements require new game points. Improving the fixing properties of toner particles and adding sox have a great effect on the properties fundamentally required of toner particles, such as electrostatic properties, fluidity, and storage stability. The effectiveness of cleaning methods decreases over time and there are problems with maintenance.

In view of the current situation, Akira Kinoe et al. proposed #3' a method for eliminating offset development during pressure fixing without changing the electrical characteristics of toner and recording material, and without maintenance. As a result of discussions, we have completed the present invention.

The present invention is an electrostatic recording material for pressure fixing comprising a dielectric layer provided on one side of a conductive support, characterized in that the other side of the conductive support is treated with a release agent. This is an electrostatic recording medium for pressure fixing.

As the mold release agent in the present invention, various substances used as mold release agents or lubricants in the molding industry of plastics, rubber, etc. can be used, and examples thereof include the following.

Zinc stearate, calcium stearate, barium stearate, aluminum stearate.

Magnesium stearate, zinc stearate/calcium stearate complex 2 Metal soaps such as zinc palmitate, lead laurate, nickel laurate, stearamide, ethylene bisamide stearate, amide palmitate 1. Fatty acid amides such as l-lysosylic acid amide, lauric acid amide, myristic acid amide F, and vinyl caprate.

Fatty acid ester waxes such as propyl laurate, hebutyl myristate, decyl thumalumitate, isoamyl oleate, isobutyl ricinoleate, di-n-dodecyl 1.17-hebutadecamethylenedicarboxylate,
Aliphatic hydrocarbon waxes such as paraffin wax, polyethylene wax, microcrystalline wax, chlorinated paraffin wax, stearic acid, and capric acid.

Higher fatty acids such as lauric acid, 2,2-dimethyldodecanoic acid, 2-pentyhidedecanoic acid, myristoleic acid,
Higher aliphatic alcohols such as lauryl alcohol, myristyl alcohol, stearyl alcohol, glycerin, and sorbitan, silicone resins, silicone oils, and emulsions thereof.

Among these mold release agents, metal soaps, fatty acid amides,
Aliphatic hydrocarbon waxes, silicone resins, silicone oils, and emulsions thereof are particularly preferably used because they yield a uniform processing solution and have excellent processing effects. Those which are in a solid state at the time of application are particularly preferably used because they do not transfer or diffuse into the dielectric layer and there is no risk of deteriorating the fixing properties of the toner.

In the present invention, there are no particular limitations on the method for obtaining a conductive ++1° support treated with a mold release agent, and at least the surface of the conductive support that does not come into contact with the IM dielectric layer is treated with a mold release agent. If a conductive layer is to be provided on a surface not in contact with the dielectric layer, if necessary, a release agent may be mixed into the conductive layer, or a new treatment may be applied to the conductive layer. It's okay.

The processing liquid used at this time is prepared by dissolving or dispersing a mold release agent in a suitable medium, and further adding adhesives, pigments, etc. as necessary.
It is prepared by adding a conductive substance W such as a conductive polymer electrolyte. As a treatment method for the saw treatment solution prepared by the saw treatment, bar coater, air knife coater, blade coke, etc. are available, and impregnation methods such as size press are also possible, but it is preferable to use a coating method. be done.

The processing amount of the release agent in the present invention is t. lI-
The material and composition of the toner particles, the characteristics of the toner particles, the f of the release agent used, etc. Although it cannot be determined unconditionally as it varies depending on the type, etc.
A small amount will not be effective; on the other hand, if too much is used, the transfer to the metal roll will be excessive, leading to paper feeding problems such as roll slippage and poor insertion. Therefore, it is desirable to treat the mold release agent so that the amount is generally in the range of 0.001 to 2 g/m, preferably in the range of 0.01 to I g/rrl.

In the present invention, as mentioned above, the surface opposite to the dielectric layer is treated with a specific type agent, but despite this, the offset phenomenon that occurs in the dielectric layer during pressure fixing occurs. The extremely effective prevention is thought to be due to the following mechanism.

That is, when the recording medium of the present invention is pressurized between the fixing rolls, an appropriate amount of the release agent is transferred to the roll that is in contact with the back side of the recording medium, and then this transferred release agent is transferred to the roller during idle operation. It is thought that this is because the particles are further transferred to the roll in contact with the dielectric layer side at times, and as a result, appropriate mold release properties are always imparted to the roll on the dielectric layer side.

According to the recording medium of the present invention, the electrical properties of the dielectric layer or the fixing properties of the toner are not inhibited unlike when the dielectric layer is treated with a release agent, and offset is extremely effectively achieved. The phenomenon is to be prevented.

In the present invention, the conductive substance used in preparing the conductive support is not particularly limited, and substances commonly used in the field of electrostatic recording materials can be used, such as polyvinylbenzyl Trimethylammonium chlorite, boronocryloxyethyltrimethylammonium chloride, polymethacryloxyethyl dinodyl-β-hydroxyedylammonium chloride
Conductive polymer electrolytes such as lar(1', poly(N,N-dimethyl-3,5-methylene)piperidinium chloride, polystyrene sodium sulfmenate, aluminum,
Electronically conductive powders such as gallium, indium-doped zinc oxide, antimony-topped tin oxide, tin-topped indium oxide, copper iodide, chloride, potassium chloride, sodium oxalate, etc. , calcium chloride, sodium hydroxide, potassium hydroxide, calcium hydroxide, and other inorganic compounds.

In the present invention, the above-mentioned conductive substance is prepared as a coating liquid by melting it in water, but when preparing the coating liquid, it is necessary to use polyvinyl alcohol, polyvinyl alcohol, etc. Medilsenol/I
: J-S, H-1'xyethylcellulose, carboxymethylcellulose, starch, modified aluminum 15), polyvinylpyrrolidone, sodium alginate, polyacrylamide,
Nonionic, weak anionic and cationic latex such as styrene-butadiene copolymer latex, vinyl acetate latex, acrylic acid latex, styrene and
Adhesives such as maleic anhydride copolymer salt, isobutyne/maleic anhydride copolymer salt, calcium carbonate, norium sulfate, titanium oxide, clay, kaolin, zeolite 1-3
aluminum oxide, silicon oxide, aluminum hydroxide,
Various auxiliary agents such as inorganic and organic pigments such as polystyrene microballs, splitting agents, antifoaming agents, dyes, and ultraviolet absorbers can also be added as appropriate. The coating solution thus obtained is applied onto a Jl % support substrate such as paper or synthetic paper, and a conductive layer is formed at least on the surface in contact with the dielectric layer, thereby preparing a conductive support.

As a method for applying a coating liquid to a supporting substrate, R-coater,
Not only coating methods using an air knife coater, blade caulk, etc., but also impregnation methods using a size press, etc. are possible, but coating methods are preferred. The amount of treatment is based on the surface electrical resistance value of the conductive support being 10G to 1
Opened to 0.9 ohm, typically dry weight 2~
20 g/rtr, preferably 3-15 g/rtr? It is coated or impregnated within the range of

In the present invention, the coating liquid for forming the dielectric layer may be a taffi agent type or an aqueous dispersion type, such as vinyl acetate resin, vinyl chloride resin, silicone resin, epoxy resin, acrylic resin, polyester 4^1 resin, etc. , butyral resin, vinyl acetate/crotonic acid copolymer, styrene/butadiene copolymer, vinyl chloride/vinyl acetate copolymer, vinylidene chloride/vinyl chloride copolymer, vinylidene chloride/
Acrylonide resin...Insulating properties such as coalescence 10] Fat t1'
Organic solvent solution or aqueous content of 4-doku or mixture +t
Although t liquid is exemplified, such a coating liquid is not particularly limited to use in the electrostatic recording material for pressure fixing of the present invention, and can be appropriately selected from known insulating resins and used. There are also auxiliary agents commonly contained in coating liquids, such as clay, kaolin, talc, calcilla carbonate, barium sulfate, barium carbonate, titanium oxide, zinc oxide, alumina, calcined clay, and organoporin. Of course, the addition of inorganic pigments treated with sun or beef tallow, fine polymer particles, starch powder, dyes, etc. is not excluded, and the coating method is also carried out using a conventional coating device. There is no particular limitation on the coating amount, but it is generally 2 to 10 g/% by dry weight, preferably 4 to 1.
It is adjusted within the range of g/n (.

The present invention will be explained in more detail with reference to Examples below, but it is of course not limited thereto. Also, unless otherwise specified, parts and percentages in the examples refer to parts by weight and percentages by weight, respectively.

Example 1 A 33% aqueous solution of polyvinylbenzyltrimethylammonium chloride 1 (manufactured by Dow Chemical Company, trade name: EcR-34) was applied on one side of a high-quality paper weighing 50 g/n (dry application amount: 3 g). / rr+ and dried.Next, 40 parts of calcium carbonate (manufactured by Bihoku Funka Co., Ltd., trade name: Softon 1800) and 60 parts of Budgeral resin (manufactured by Rusui Kagaku Co., Ltd., trade name: BMS) were then applied on top. A dielectric layer was formed by mixing and drying a 25% toluene solution so that the dry coating amount was 5 g/n.

Next, the "bi-quality paper side" opposite to the side on which the dielectric layer was provided -
, a 33% aqueous solution of polyvinylhensyltrimethylammonium chlorite (manufactured by Dow Chemical Company, trade name: ECR)
-34) 100 parts (solid content equivalent), 50 parts of calcium carbonate (manufactured by Bihoku Funka Co., Ltd., trade name Softon 1800), emulsion of calcium stearate as a mold release agent (manufactured by San Nobuco Co., Ltd., trade name Noburo 1-(, -104) ) 10 copies (
A coating solution obtained by thoroughly mixing 850 parts of water (based on solid content) was coated and dried to give a dry coating amount of 2 g/rd to obtain electrostatic recording paper for pressure fixing.

Comparative Example 1 An electrostatic recording paper for pressure fixing was obtained in exactly the same manner as in Example 1, except that the emulsion of calcium stearate was not used.

Comparative Example 2 An electrostatic recording paper for pressure fixing was prepared in the same manner as in Example 1, except that the amount of calcium stearate emulsion used was 0.05 part in terms of solid content.

Examples 2 to 5 In Example I, instead of the calcium stearate emulsion, 10 parts of a silicone resin emulsion (manufactured by Shin-Etsu Chemical Co., Ltd., trade name Poron C) (Example 2) and a polyethylene wax emulsion (manufactured by Allied Chemical Co., Ltd., 30 parts of stearamide emulsion (manufactured by Tokyo Yushi Co., Ltd., trade name Lodul 187N) (Example 4), and self-emulsifying glycerin monostearate powder (Kao Electrostatic recording paper for pressure fixing of type 4fffi was obtained in exactly the same manner as in Example 1, except that 100 parts of Alasocel 165) manufactured by Atlas Co., Ltd. (Example 5) was used as a release agent.

Note that the amounts used in Examples 2 to 4 represent solid content conversion values.

The seven types of electrostatic recording paper for pressure fixing thus obtained were transferred to a facsimile machine (UF-520, manufactured by Matsushita Densen Co., Ltd.) whose roll for pressure fixing had been thoroughly cleaned, using the electrophotographic society Yo 2 test chart. Continuous 3 in copy mode °
0 messages were recorded. The pressure fixing roll was thoroughly cleaned every time recording of 30 copies of one sample was completed.

Then, the occurrence of the offset phenomenon was evaluated, and the results are shown in Table 1.

As is clear from the results shown in Table 1, the electrostatic recording medium for pressure fixing of the present invention was an excellent recording medium in which the occurrence of the off-mono 1 phenomenon was extremely effectively prevented.

Prior applicant: Kanzaki Seiki Co., Ltd. Procedural amendments Commissioner of the Patent Office 1, Indication of the case, Patent Application No. 230069 of 1982, 2, Name of the invention: Electrostatic recording medium for pressure fixing 3, Person making the amendment 4, Agent Place of residence: 11 Kanzaki Paper Co., Ltd., Raikoji Motomachi 1, Amagasaki City, 660 5 Date of amendment order Voluntary 6 Subject of amendment ``Detailed explanation of the invention'' column of specification (contents of amendment) +11 In the third line of page 2 of the specification, [...between hot rolls...] is corrected to [...between hot ovens...].

(that's all)

Claims (1)

[Claims] (11) A pressure fixing electrostatic recording material comprising a dielectric layer provided on one side of a conductive support, characterized in that the other side of the conductive support is treated with a release agent. Electrostatic recording material for fixing.