# US 8,541,341 B2 · Thermal transfer sheet

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- Number: US 8,541,341 B2
- Document ID: US8541341B2
- Status: Granted
- Kind: B2
- Application number: 13/354,746
- Filed: 2012-01-20
- Published: 2012-07-26
- Granted: 2013-09-24
- Earliest claimed: 2011-01-26
- Assignees: Sony Corporation
- Applicants: Masakazu Sawada
- Inventors: Masakazu Sawada
- Web page: https://patentgrep.com/patent/US8541341B2

## CPC

- B41M 5/423: {characterised by non-macromolecular compounds, e.g. waxes}
- 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)

## Abstract

There is provided a thermal transfer sheet including a thermal transfer dye layer formed on one surface of a base sheet and containing a dye and a heat resistant smooth layer formed on the other surface of the base sheet and containing a binder, a lubricant containing phosphoric acid ester having a melting point of 50° C. or more, and a filler. The phosphoric acid ester is contained in the heat resistant smooth layer at a ratio of 5 mass % or more and 25 mass % or less and contains straight chain phosphoric acid monoalkyl ester at a ratio of 16 mass % or more and 75 mass % or less of a total amount thereof.

## Claims

### Claim 1

A thermal transfer sheet comprising:
a thermal transfer dye layer formed on one surface of a base sheet and containing a dye and
a heat resistant smooth layer formed on the other surface of the base sheet and containing a binder, a lubricant containing phosphoric acid ester having a melting point of 50° C. or more, and a filler, wherein
the phosphoric acid ester is contained in the heat resistant smooth layer at a ratio of 5 mass % or more and 25 mass % or less and contains straight chain phosphoric acid monoalkyl ester at a ratio of 16 mass % or more and 75 mass % or less of a total amount of phosphoric acid ester.

### Claim 2 (depends on 1)

The thermal transfer sheet according to claim 1, wherein
the phosphoric acid monoalkyl ester is monooctadecyl phosphate.

### Claim 3 (depends on 1)

The thermal transfer sheet according to claim 1, wherein
the binder of the heat resistant smooth layer is crosslinked by a polyisocyanate compound.

### Claim 4 (depends on 1)

The thermal transfer sheet according to claim 1, wherein
the filler of the heat resistant smooth layer contains spherical particles containing polymethyl silsesquioxane or a mixture of the spherical particles containing polymethyl silsesquioxane and talc which is tabular particles.