# US 4,400,100 A · Four layered ribbon for electrothermal printing

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- Number: US 4,400,100 A
- Document ID: US4400100A
- Status: Granted
- Kind: A
- Application number: 06/239,781
- Filed: 1981-03-02
- Granted: 1983-08-23
- Earliest claimed: 1981-03-02
- Assignees: International Business Machines Corporation
- Inventors: Ari Aviram; Susan O. Ellmann
- Web page: https://patentgrep.com/patent/US4400100A

## CPC

- B41M 5/3825: {Electric current carrying heat transfer sheets}
- Y10T 428/31507: Of polycarbonate
- Y10T 428/31663: As siloxane, silicone or silane
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Four layer resistive ribbon transfer tapes for use in electrothermic printing devices are fabricated. The tapes are comprised of a substrate having a heat transferable ink on one of its surfaces, and on its opposing surface there is disposed a metal layer. Bonded to the metal layer is a resistive layer. This resistive layer is caused to be bonded to the metal layer by a layer of an alkoxysilane compound therebetween.

## Claims

### Claim 1

An improved resistive ribbon for electrothermal printing comprising,
a substrate having at one of its surfaces an ink which when heated is transferable onto a printing surface;
a metal layer on the opposing surface of said substrate,
a resistive composition layer atop said metal layer; and a bonding layer between said metal layer and said resistive layer to bond said metal and resistive layers together.

### Claim 2 (depends on 1)

An improved resistive ribbon according to claim 1 wherein said bonding layer is comprised of an adhesion promoter selected from an amino-amine containing alkoxysilane having the following formulae: ##STR2## where R is selected from methyl and ethyl groups Y is 1 to 18 and X is 1 to 18, and
(R--O).sub.3 --Si--(CH.sub.2).sub.n --NH.sub.2
where R is an alkane group having from 1-5 C atoms and n is from 1-18.

### Claim 3 (depends on 2)

An improved resistive ribbon according to claim 2 wherein said resistive layer is comprised of graphite filled polycarbonate and said conducting film is Al.

### Claim 4 (depends on 2)

An improved resistive ribbon according to claim 2 wherein said adhesion promoter is selected from 3-(2-aminoethylamine) propyltrimethoxysilane, 3-(2-aminoethylamine) propyltrimethoxysilane and 3-(2-aminoethylamine) propyltriethoxysilane, 3-(2-aminoethylamine) propyltrimethoxysilane, 4-(2-aminoethylamine) butyltrimethoxysilane, 4-(2-aminoethylamine) butyltriethoxysilane, 12-(2-aminoethylamine) dodecyltriethoxylsilane, 12-(3-aminopropylamine) dodecyltriethoxysilane, 18-(4-aminobutylamine) octadecyltriethoxysilane, 3-triethoxysilane propylamine, 3-trimethoxysilane propylamine, 6-trimethoxysilane hexylamine, 12-triethoxysilane dodecylamine, 18-triethoxysilane octadecylamine.

### Claim 5

A method for fabricating four layered resistive ribbons for electrothermal printing including the steps of:
(a) providing a substrate having a conducting film disposed on one of its surfaces;
(b) applying a thin layer of an alkoxysilane adhesion promoter to said conducting film having the following structures: ##STR3## where R is CH.sub.3 or C.sub.2 H.sub.5, Y=1-18 and X is 1-18, and
(R--O).sub.3 --Si--(CH.sub.2).sub.n --NH.sub.2
where R is an alkane group having from 1-5 C atoms and n is from 1-18;
(c) heating said adhesion promoter coated substrate at a temperature and for a time sufficient to cause said adhesion promoter to adhere to said conducting film,
(d) cooling the substrate and coating a resistive composition layer onto said adhesion promoter layer;
(e) again heating said so coated substrate for a time and at a temperature sufficient to cause said resistive composition layer to adhere to said adhesion promoter layer; and thereafter
(f) coating on the other surface of said substrate an ink which is transferable onto a printing surface when electrothermally heated.

### Claim 6 (depends on 5)

A method according to claim 5 wherein said conducting film is Al, said resistive composition is graphite filled polycarbonate and said adhesion promoter layer is selected from 3-(aminomethylamine) propylmethoxysilane, 3-(2-aminoethylamine) propyltrimethoxysilane and 3-(2-aminoethylamine) propyltriethoxysilane, 4-(2-aminoethylamine) butyltrimethoxysilane, 4-(2-aminoethylamine) butyltriethoxysilane, 12-(2-aminoethylamine) dodecyltriethoxysilane, 12-(3-aminopropylamine) dodecyltriethoxysilane, 18-(4-aminobutylamine) octadecyltriethoxysilane, 3-triethoxysilane propylamine, 3-trimethoxysilane propylamine, 6-trimethoxysilane hexylamine, 12-triethoxysilane dodecylamine, 18-triethoxysilane octadecylamine.

### Claim 7 (depends on 5)

A method according to claim 5 wherein said heating steps are at a temperature in the range of 25.degree. C. to about 120.degree. C. and for about 1 to 5 minutes.

### Claim 8 (depends on 5)

A method according to claim 5 wherein said heating steps are at a temperature in the range of about 65.degree. C. to about 100.degree. C.