JPS59192261A - Developer - Google Patents

Abstract

PURPOSE:To improve the piezoelectric constant of a piezoelectric sheet by using a developer for developing an electrostatic latent image contg. a piezoelectric polymer as the principal component or a developer for developing an electrostatic latent image contg. an inorg. piezoelectric material dispersed in said polymer. CONSTITUTION:To 100pts.wt. piezoelectric polymer such as polyvinylidene fluoride is added 5pts.wt. chlorinated polyester or the like as a charge controller, and they are melted, kneaded, pulverized, and sphered in a flow of gas at a high temp. to obtain a toner of 10-20mum particle size. This toner is mixed with iron powder as a carrier to prepare a developer. A toner consisting of 40pts.wt. polyvinylidene fluoride, 5pts.wt. chlorinated polyester as a charge controller, and 55pts.wt. inorg. piezoelectric material such as lead titanate zirconate may be mixed with a carrier to prepare a developer. A prescribed image is printed on a ''Mylar'' film by an electrophotographic process with the developer. The mass productivity of piezoelectric sheets having a high peizoelectric constant can be improved by using the developer contg. the piezoelectric polymer as the pincipal component.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a developer, and particularly to a developer for use in speakers and personal computers.

The structure of the conventional example and its problems The polymer piezoelectric material is polyvinylidene fluoride (PvF2)
is a typical material, and most of the materials actually used are in the form of a film. This film is formed by heat pressing or extrusion molding in the same way as general polymer materials. The stretched polymer film is polarized by applying a direct current voltage and then used as a piezoelectric device. When the piezoelectric constant of a piezoelectric film is not sufficient for practical use, the properties are improved by dispersing a piezoelectric inorganic material in a piezoelectric polymer to form a composite.

Compositeization is usually carried out by the roll method or the melting step method. In the roll method, a polymer material and a piezoelectric inorganic material are kneaded using a roll at a temperature near the softening point of the polymer to form a composite material, which is then formed into a sheet by press molding or the like. In addition, the melting method involves dissolving a polymeric material in a solvent, adding and mixing a piezoelectric inorganic material thereto, and forming the resulting suspension into a film on a glass plate.

Most of the molded products obtained by these molding methods are in the form of sheets, which are then cut or punched according to various uses, resulting in wasted sheets.

Furthermore, in order to improve the piezoelectric constant of a composite piezoelectric polymer material, it is necessary to add a considerably large amount of piezoelectric inorganic material, but in this case, it is not sufficiently kneaded with the polymer material. Molding becomes difficult, making it difficult to obtain thin sheets. Therefore, there is a limit to the ability to improve the properties of polymer piezoelectric materials through compositing, and the properties are currently far inferior to those of ordinary piezoelectric ceramic materials.

Purpose of the Invention The present invention was made in order to improve the above-mentioned drawbacks in the production of piezoelectric polymer materials, and provides a piezoelectric polymer that makes it possible to easily produce piezoelectric polymer films of arbitrary shapes. The present invention provides a developer containing a molecular material as a main component.

Structure of the Invention The developer of the present invention is characterized in that the main component thereof is a resin that has a chargeability sufficient to visualize an electrostatic latent image, and the resin is a piezoelectric polymer. Furthermore, if necessary, a piezoelectric inorganic material may be contained therein.

By using the developer according to the present invention, a polymer piezoelectric film of any shape can be easily produced with good mass production by using an electrostatic latent image, and furthermore, when assembling a piezoelectric device, the film can be cut. A film with a predetermined shape can be obtained from the beginning without the need for processing. If the developer contains pressure-sensitive inorganic silk, the content can be precisely controlled, making it possible to create a 17-'1 composite polymer film with a high content. The object of the present invention is to provide a developer that can solve the drawbacks of the sheet manufacturing method described above.

Description of examples Hereinafter, the present invention will be explained in detail based on examples.

(Example 1) Add 5 parts by weight of chlorinated polyester as a charge control agent to Amazumi polyvinylidene heptanide (PVF2) and mix it by melting.Then, it is finely pulverized, spheroidized in a high-temperature air stream, and viscous. diameter is 1
Particles (toner) of 0 to 20 μm were obtained.

These toners were printed on Mylar film 8 by the process shown in Figures 1 to 3 using iron powder with an average particle size of 70 μm covered with a stable oxide film of tetra-iron oxide Fe 304 as a carrier. . That is, by scanning the corona charger 3 over the photosensitive substrate 1, the photosensitive substrate 1 is uniformly charged. 2a is a charging power source (Fig. 1). Next, the charged photosensitive substrate was exposed to pattern light to form an electrostatic latent image. Then, development 5 was performed using charged particles (toner) using a developing device 4.

Here, 6 is a power source for developing bias (FIG. 2).

Next, after transferring to Mylar film 8 using corona discharge,
The developer was fixed by the heat roller 7 (third [Si1).

The above method has been used to produce sheets of piezoelectric polymers similar to those produced by conventional hot press or extrusion methods.

(Example 2) 40 parts by weight of polyvinyl fluoride, 6 parts by weight of chlorinated polyester as a charge control agent, lead zirconate titanate [
pb (Z r , 'r i ) o3) system particles at 55
Parts by weight were added, melted and kneaded, and then finely pulverized and spheroidized in a high-temperature air stream to obtain particles (toner) with a particle size of about 15 μm.

This toner was printed on Mylar film in a manner similar to Example 1.

It was confirmed that the printed sheet had piezoelectric inorganic particles dispersed in the piezoelectric polymer, and was in a state similar to that of composite piezoelectric polymer materials obtained by the roll method or solvent method. did.

Next, f/lead zirconate (pb(Zr, Ti)
03) As a result of similar printing experiments using a developer with an increased amount of particles added, the flexibility of the sheet decreased as the amount added increased, but even when the amount added was 96 parts by weight or more, the sheet It was possible to print in

In the above examples, polyvinylidene fluoride (PVF2) and polyvinyl fluoride were used as the piezoelectric polymer material, and lead zirconate titanate [pb (Z) was used as the piezoelectric inorganic material.
r, Ti) O9-based particles were used, but it is possible to create pressure dL properties of any shape in exactly the same way even with developers using other piezoelectric polymers and piezoelectric inorganic materials. (Not even close to saying.)

- Furthermore, it is clear that there is no particular limitation on the printing method, as long as it includes a process based on the principle of making an electrostatic latent image visible using a developer, other than those in the Examples.

Effects of the Invention As described above, by using the developer containing no piezoelectric polymer according to the present invention and having a piezoelectric polymer as a main component,
For example, by a process similar to electrophotography, a piezoelectric sort having an arbitrary shape can be easily produced. Furthermore, in piezoelectric (I: piezoelectric compounded by adding an inorganic substance) raw polymer, it is possible to arbitrarily control the I content of dielectric solid stone.
Excellent pressure centrality 7-1 f/l; WCj or 1-
I] It is a very high value in practical terms, such as becoming capable.

[Brief explanation of the drawing]

Figures 1, 2, and 3 are diagrams for explaining the sheet manufacturing process using the developer of the embodiment of the present invention. 1...-photosensitive substrate, 2... TFL source for corona charger,
3...Corona charger, 4--Developing device, 5-Developer, 6--Developing bias roller, 7-Fixing roller, 8--Myrafil A.

Claims (2)

[Claims] (1) A developer characterized in that the main component is a resin imparted with chargeability sufficient to visualize an electrostatic latent image, and the resin is made of a piezoelectric polymer material. (2) The developer according to claim 1, wherein the resin contains a piezoelectric inorganic material.