# US 4,400,706 A · Discharge recording medium

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- Number: US 4,400,706 A
- Document ID: US4400706A
- Status: Granted
- Kind: A
- Application number: 06/287,686
- Filed: 1981-07-28
- Granted: 1983-08-23
- Earliest claimed: 1980-07-30
- Assignees: Honshu Seishi Kabushiki Kaisha
- Inventors: Shuji Takemura; Kazumi Hirakawa; Tsuneto Yoshizumi
- Web page: https://patentgrep.com/patent/US4400706A

## CPC

- B41M 5/245: {Electroerosion or spark recording}
- G01D 15/06: Electric recording elements, e.g. electrolytic
- B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P)
- G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR

## Abstract

A discharge recording medium having a colored insulating layer, a metal-vaporized layer and, as required, a protection layer formed in that order on a support member, wherein the colored insulating layer contains a graphite powder having particles of a specifically determined average size in an amount according to a specifically determined ratio with respect to a bonding resin in the colored insulating layer.

## Claims

### Claim 1

In a discharge recording medium comprising a colored insulating layer comprising an insulating bonding resin with or without a coloring agent, a metal-vaporized layer and, if desired, a protection layer that are formed in that order on a support member, the improvement wherein the colored insulating layer contains a graphite powder having an average particle diameter of 0.1 to 50 .mu.m in amounts of greater than about 15 parts by weight per 100 parts by weight of a bonding resin which is contained in said colored insulating layer, so that the colored insulating layer has a surface resistivity of 10.sup.10 to 10.sup.13 ohms.

### Claim 2 (depends on 1)

A discharge recording medium according to claim 1, wherein the graphite powder has an average diameter of 0.5 to 30 .mu.m.

### Claim 3 (depends on 1)

A discharge recording medium according to claim 1, wherein the content of the graphite powder is greater than about 20 parts by weight per 100 parts by weight of the bonding resin.

### Claim 4 (depends on 1)

A discharge recording medium according to claim 1, wherein the bonding resin is a cellulose resin.

### Claim 5 (depends on 1)

A discharge recording medium according to claim 1, wherein the colored insulating layer further contains a small amount of carbon black having particle diameters smaller than 0.1 .mu.m.