JPS6294378A - Heat-resistant antistatick film - Google Patents

Abstract

PURPOSE:To provide a color copying OHP film capable of expressing images with favorable quality, by using a base film comprising an aromatic polysulfone type resin as a main constituent, and providing an antistatic agent layer having a specified surface resistivity on each of face and back sides of the film. CONSTITUTION:An aromatic polysolfone type resin constituting a base film is a polysulfone resin or a polyether sulfone resin, and the surface resistance of he film must be in the range of 10<8>-10<12>OMEGA/square. If the surface resistance is lower than 10<8>OMEGA/square, static electrification property is poor, or transfer quantity may differ for different ones of yellow, red and blue toners due to different transferrability, resulting in problems as to reproducibility of tones. If the surface resistance is higher than 10<12>OMEGA/square, sparks are generated at the surface of the film, causing defects in a copy surface. An antistatic agent is preferably based on a quaternary ammonium salt or a partially silanolated siloxane, in view of stability of the surface resistance, durability, heat resistance or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a plastic film for OHP color copying, and in particular to a plastic film that has excellent heat resistance and antistatic property, that is, an appropriate surface resistance value. Regarding film.

[Prior art]

Films for overhead projectors that are commonly seen today use films made of g-stretch = f-lyester film paste with antistatic treatment.
(called a PC), it is copied and used. PPC is a transfer method using carbon toner, and the resulting copy is expressed in black and white. A user may colorize a copy film with a specific ink for the purpose of highlighting a portion, but this is merely a color underline rather than an overall colorization. Therefore, OHP, which is used in place of slides, has become popular due to its simplicity, but it can be said that it has not replaced slides in terms of color display. However, in recent years, color copying technology has been perfected and gradually become popular, and color OHI' films have since been sold.

However, the current film base is stretched sr IJ −
It is an r-stell film and has insufficient heat resistance. That is, in a color copying machine, three color toners are sequentially transferred onto a film at a considerably higher temperature than in black and white PPC. The current stretched ester film base begins to shrink and soften at about 70°C, resulting in wrinkles in the finished copy film and inability to accurately represent dimensions.

[Purpose of the invention]

An object of the present invention is to provide a color copying OHP film which can solve the above-mentioned defects in heat resistance of the stretched ester film base and which can express good quality and images.

[Structure of the invention]

The film of the present invention has a base film containing an aromatic polysulfone type resin as a main component, has an antistatic (arsenic agent layer) applied to both the front and back sides of the film, and has a surface resistance value of 108 to 101 gΩ/ This is a heat-resistant and anti-static film for Color 011P, which is characterized by the fact that it is a base film.That is, the base film is formed into a film whose main component is a resin consisting of repeating units of the aromatic pyrisulfone general formula -Ar -5O2-. Ar of aromatic polysulfone has a divalent unit (polyether sulfone made by ICI) and a repeating unit (polysulfone made by UCC). In addition to the main component, 10 (i
Other substances may also be added.

That is, additives such as stabilizers, antioxidants, lubricants, inorganic fillers, pyriester resins, polycarbonate resins, lyamide resins, polyphenylene sulfide resins, ether imide resins, etc. This includes resins such as realylate resin. The base film usually has a thickness of 75 to 125 microns.

As a basic characteristic, light transmittance (ASTMD-1003'
) must be SOS or higher, and haze (ASTMD-1003) must be 5 or lower. In addition, the glass rolling V of the base film
The temperature is required to be 150°C or higher.

Antistatic layers are applied to both sides of the base film.

Examples of antistatic agents include cationic agents such as quaternary ammonium salts, anionic agents such as aliphatic sulfone rIRtJ[, rlle alcohol sulfate ester salts, and higher aryol phosphate ester salts, amphoteric surfactants such as betaine, and partially silanolated siloquines. A type antistatic agent is used. The surface resistance value of the film surface must be in the range of 108 to 10111 Ω/hole. If the surface resistance value is lower than 106 Ω/mouth, the charging performance will decrease, and the transferability of each yellow, red, and blue toner will be poor, and there will be differences in the amount of transfer between toners, rounding, and color tone reproduction. Sexual problems arise. If the surface resistance value is higher than 1012 Ω/mouth, smearing will occur on the sheet surface, causing defects on the copy surface. In terms of stability of surface resistance value, durability, and heat resistance, quaternary ammonium salts and partially silanated siloxane-based antistatic agents are more preferable.

〔Effect of the invention〕

When a color copying OHP film was produced using the film according to the present invention, there was no deformation, wrinkles, or shrinkage of the film that occurred with the stretched ester film, and the OHP film was of good quality.
A P film was obtained. In addition, there is no difference in color reproducibility compared to that based on stretched ester film,
There were also printing defects due to scratches.

〔Example〕

Examples and comparative examples are listed and explained in Table 1.

In Table 1, the coated surface refers to the surface to which toner is transferred.

A gravure coater was used in both cases. The surface resistance value is based on AS'IMD-1003. Unit Ω/mouth

Claims (1)

[Claims] 1. The base film is a film mainly composed of an aromatic polysulfone type resin, and an antistatic layer is applied to both the front and back sides of the film, and the surface resistance value is 10^8.
Color O characterized by ~10^1^2Ω/□
Heat resistant anti-static film for HP. 2. The heat-resistant antistatic film for color OHP according to claim 1, wherein the aromatic polysulfone type resin is a polysulfone resin or a polyethersulfone resin. 3. The heat-resistant antistatic film for color OHPs according to claim 1 or 2, wherein the antistatic layer is a partially silanated siloxane layer or a quaternary ammonium salt-based antistatic agent layer.