# US 5,346,877 A · Heat transfer sheets

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- Number: US 5,346,877 A
- Document ID: US5346877A
- Status: Granted
- Kind: A
- Application number: 08/086,874
- Filed: 1993-07-08
- Granted: 1994-09-13
- Earliest claimed: 1988-09-12
- Assignees: Dai Nippon Insatsu Kabushiki Kaisha
- Inventors: Masayuki Nakamura
- Web page: https://patentgrep.com/patent/US5346877A

## CPC

- B41M 5/39: Dyes containing one or more carbon-to-nitrogen double bonds, e.g. azomethine
- C09B 53/02: Indamines; Indophenols
- Y10S 428/913: Material designed to be responsive to temperature, light, moisture
- Y10S 428/914: Transfer or decalcomania
- Y10T 428/31786: Of polyester [e.g., alkyd, etc.]
- 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)
- C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A heat transfer sheet is provided, which includes a base sheet and a dye carrier layer formed on one side of said base sheet, said dye carrier layer carrying a mixture of at least one dye expressed by the following general formula (I) with at least one other sublimable dye showing a maximum absorption wavelength at from 560 to 700 nm and having a molecular weight of at least 345: ##STR1## wherein: R.sub.1 to R.sub.4 each are a C.sub.1 to C.sub.6 alkyl group, a cycloalkyl group or a phenyl group, provided that R.sub.2 may be a hydrogen atom or an alkoxy group and R.sub.3 and R.sub.4 may form together a ring.

## Claims

### Claim 1

A heat transfer sheet comprising:
a base sheet; and
a dye carrier layer formed on one side of said base sheet,
said dye carrier layer comprising a binder and a mixture of at least two dyes expressed by the following formulae (I) and (II): ##STR26##

### Claim 2 (depends on 1)

The heat transfer sheet as claimed in claim 1, wherein the weight ratio of the dye of formula (I) to that of formula (II) is from 5:95 to 85:15.

### Claim 3 (depends on 1)

The heat transfer sheet as claimed in claim 1, wherein the base sheet comprises polyethyleneterephthalate film.

### Claim 4 (depends on 1)

The heat transfer sheet as claimed in claim 1, wherein the binder comprises at least one of cellulosic resins and vinylic resins.

### Claim 5 (depends on 4)

The heat transfer sheet as claimed in claim 4, wherein said cellulosic resins are selected from the group consisting of ethyl cellulose, hydroxyethyl cellulose, ethylhydroxy cellulose, hydroxypropyl cellulose, methyl cellulose, cellulose acetate and cellulose acetobutyrate.

### Claim 6 (depends on 4)

The heat transfer sheet as claimed in claim 4, wherein said vinylic resins are selected from the group consisting of polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal, polyvinyl pyrrolidone and polyacrylamide.

### Claim 7 (depends on 1)

The heat transfer sheet as claimed in claim 1, wherein a heat resistant layer is formed on the back side of the base sheet.