Black thermal transfer sheet

• US 5,858,628 A
• Filed: 09/11/1997
• Issued: 01/12/1999
• Est. Priority Date: 09/13/1996
• Status: Expired due to Term

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: Yoshida, Kazuya, Eguchi, Hiroshi
• Primary Examiner(s): Schilling, Richard L.
• Application Number:
  US08/927,789
• Time in Patent Office: 488 Days
• Field of Search: 430/201, 430/964, 430/338, 8/471, 503/227
• US Class Current: 430/338
• CPC Class Codes: B41M 5/39 Dyes containing one or more carbon-to-nitrogen double bonds, e.g. azomethine
• CPC Class Codes: Y10S 430/165 Thermal imaging composition

Abstract

A black thermal transfer sheet comprises a substrate film and a black dye layer formed on one surface of the substrate film. The die layer comprises dye and a binder. The dye comprises a first dye and a second dye respectively expressed by the following formulae (1) and (2): ##STR1## (where, "R¹ " and "R² " represent a substitutional or non-substitutional alkyl group, etc., "R³ " represents a hydrogen atom, etc., "R⁴ " represents a substitutional or non-substitutional alkyl group, etc., and "R⁵ " represents a substitutional or non-substitutional aminocarbonyl group, etc.; and "n" represents an integer of 1 or 2); and ##STR2## (where, "R¹ ", "R² ", "R³ " and "n" represent the same definitions as those in the formula (1), and "R⁶ " and "R⁷ " represent a substitutional or non-substitutional alkyl group, etc.).

Claims

1. A black thermal transfer sheet comprising a substrate film and a black dye layer formed on one surface of said substrate film, which dye layer comprises dye and a binder, wherein:

said dye comprises a first dye and a second dye respectively expressed by the following formulae (1) and (2);

##STR13## (where, "R¹ " and "R² " represent a substitutional or non-substitutional alkyl group, a substitutional or non-substitutional cycloalkyl group, a substitutional or non-substitutional aralkyl group, or a substitutional or non-substitutional aryl group, "R³ " represents a hydrogen atom, a halogen atom, a cyano group, a hydroxyl group, a substitutional or non-substitutional alkyl group, a substitutional or non-substitutional alkoxy group, a substitutional or non-substitutional cycloalkyl group, a substitutional or non-substitutional aralkyl group, a substitutional or non-substitutional aryl group, a substitutional or non-substitutional acyl group, a substitutional or non-substitutional acylamino group or a substitutional or non-substitutional sulfonylamino group, "R⁴ " represents a substitutional or non-substitutional alkyl group, a substitutional or non-substitutional cycloalkyl group, a substitutional or non-substitutional aralkyl group, and "R⁵ " represents a substitutional or non-substitutional aminocarbonyl group, a substitutional or non-substitutional alkoxycarbonyl group or a substitutional or non-substitutional aryloxycarbonyl group; and

"n" represents an integer of 1 or

     2); and

##STR14## (where, "R¹ ", "R² ", "R³ " and "n" represent the same definitions as those in the formula (1), and "R⁶ " and "R⁷ " represent a substitutional or non-substitutional alkyl group, a substitutional or non-substitutional cycloalkyl group, a substitutional or non-substitutional aralkyl group, or a substitutional or non-substitutional aryl group).

2. A black thermal transfer sheet as claimed in claim 1, wherein:

said dye further comprises a third dye expressed by the following formula (3);

##STR15## (where, "R⁸ " and "R⁹ " represent a substitutional or non-substitutional alkyl group, a substitutional or non-substitutional cycloalkyl group, a substitutional or non-substitutional aralkyl group, or a substitutional or non-substitutional aryl group, "R¹⁰ " represents a hydrogen atom, a halogen atom, a cyano group, a hydroxyl group, a substitutional or non-substitutional alkyl group, a substitutional or non-substitutional alkoxy group, a substitutional or non-substitutional cycloalkyl group, a substitutional or non-substitutional aralkyl group, a substitutional or non-substitutional aryl group, a substitutional or non-substitutional acyl group, a substitutional or non-substitutional acylamino group or a substitutional or non-substitutional sulfonylamino group, "R¹¹ " represents a hydrogen atom or a halogen atom, "R¹² " represents a hydrogen atom or a substitutional or non-substitutional alkyl group, "R¹³ " represents a substitutional or non-substitutional alkyl group, a substitutional or non-substitutional cycloalkyl group, a substitutional or non-substitutional aralkyl group, a substitutional or non-substitutional aryl group or a substitutional or non-substitutional alkoxy group; and

"n" represents an integer of 1 or

     2).