Thermosensitive recording medium

Patent metadata

Field	Value
Publication number	US-2023144275-A1
Application number	US-202117802599-A
Country	US
Kind code	A1
Filing date	Feb 8, 2021
Priority date	Feb 28, 2020
Publication date	May 11, 2023
Grant date	—

Abstract

Provided is a thermosensitive recording medium being excellent in oil resistance among various performances required for the thermosensitive recording medium, and being further excellent in heat resistance, plasticizer resistance, and printing (recording) run-ability.
That is a thermosensitive recording medium having a thermosensitive recording layer comprising a colorless or pale colored electron donating leuco dye and an electron accepting color developing agent on a substrate, wherein the thermosensitive recording layer contains at least two kinds of urea compounds. The two kinds of urea compounds comprise the first urea compound being represented by the following general formula 1, and the second urea compound being represented by the following general formula 2.

wherein R 1 represents a substituted or unsubstituted alkyl group, aralkyl group or aryl group, and R 2 represents a hydrogen atom or an alkyl group,

wherein R 4 to R 8 represent a hydrogen atom, a halogen atom, a nitro group, an amino group, an alkyl group, an alkoxy group, an aryloxy group, and the like, and m represents an integer of 0 to 2.

First claim

1 . A thermosensitive recording medium having a thermosensitive recording layer comprising a colorless or pale colored electron donating leuco dye and an electron accepting color developing agent on a substrate, wherein the thermosensitive recording layer contains at least two kinds of urea compounds as the electron accepting color developing agents, the first urea compound being represented by the following general formula 1, and the second urea compound being represented by the following general formula 2.

wherein R 1 represents a substituted or unsubstituted alkyl group, aralkyl group or aryl group, and R 2 represents a hydrogen atom or an alkyl group,

wherein R 4 to R 8 , may be identical or different from each other, represent a hydrogen atom, a halogen atom, a nitro group, an amino group, an alkyl group, an alkoxy group, an aryloxy group, an alkylcarbonyloxy group, an arylcarbonyloxy group, an alkylcarbonylamino group, an arylcarbonylamino group, an alkylsulfonylamino group, an arylsulfonylamino group, a monoalkylamino group, a dialkylamino group, or an arylamino group, and m represents an integer of 0 to 2.

3 - 10 . (canceled)

11 . The thermosensitive recording medium of claim 1 , wherein the first urea compound is represented by the following general formula 3,

wherein R 3 represents an alkyl group or an alkoxy group, and n represents an integer of 0 to 3.

12 . The thermosensitive recording medium of claim 11 , wherein R 3 represents an alkyl group having 1 to 4 carbon atoms, n represents an integer of 0 to 1, and R 3 is at 4-position in the benzene ring.

13 . The thermosensitive recording medium of claim 1 , wherein the second urea compound is represented by the general formula 4 or the general formula 5

14 . The thermosensitive recording medium of claim 1 , wherein the content (in solid) of the first urea compound in the thermosensitive recording layer is from 1.0 to 50.0 weight %.

15 . The thermosensitive recording medium of claim 1 , wherein the content (in solid) of the second urea compound in the thermosensitive recording layer is from 5.0 to 50.0 weight %.

16 . The thermosensitive recording medium of claim 1 , wherein the content of the second urea compound is from 0.1 to 30.0 parts by weight per 1.0 part by weight of the first urea compound, in the thermosensitive recording layer.

17 . The thermosensitive recording medium of claim 1 , wherein the thermosensitive recording layer contains color developing agent(s) other than the first urea compound and the second urea compound, and the combined amount (in solid) of the first urea compound and the second urea compound is 90 weight % or more of the total amount of the color developing agents contained in the thermosensitive recording layer.

18 . The thermosensitive recording medium of claim 1 , wherein further a protective layer is installed on the thermosensitive recording layer.

19 . The thermosensitive recording medium of claim 11 , wherein the second urea compound is represented by the general formula 4 or the general formula 5

20 . The thermosensitive recording medium of claim 11 , wherein the content (in solid) of the first urea compound in the thermosensitive recording layer is from 1.0 to 50.0 weight %.

21 . The thermosensitive recording medium of claim 11 , wherein the content (in solid) of the second urea compound in the thermosensitive recording layer is from 5.0 to 50.0 weight %.

22 . The thermosensitive recording medium of claim 11 , wherein the content of the second urea compound is from 0.1 to 30.0 parts by weight per 1.0 part by weight of the first urea compound, in the thermosensitive recording layer.

23 . The thermosensitive recording medium of claim 11 , wherein the thermosensitive recording layer contains color developing agent(s) other than the first urea compound and the second urea compound, and the combined amount (in solid) of the first urea compound and the second urea compound is 90 weight % or more of the total amount of the color developing agents contained in the thermosensitive recording layer.

24 . The thermosensitive recording medium of claim 11 , wherein further a protective layer is installed on the thermosensitive recording layer.

25 . The thermosensitive recording medium of claim 12 , wherein the second urea compound is represented by the general formula 4 or the general formula 5

26 . The thermosensitive recording medium of claim 12 , wherein the content (in solid) of the first urea compound in the thermosensitive recording layer is from 1.0 to 50.0 weight %.

27 . The thermosensitive recording medium of claim 12 , wherein the content (in solid) of the second urea compound in the thermosensitive recording layer is from 5.0 to 50.0 weight %.

28 . The thermosensitive recording medium of claim 12 , wherein the content of the second urea compound is from 0.1 to 30.0 parts by weight per 1.0 part by weight of the first urea compound, in the thermosensitive recording layer.

29 . The thermosensitive recording medium of claim 12 , wherein the thermosensitive recording layer contains color developing agent(s) other than the first urea compound and the second urea compound, and the combined amount (in solid) of the first urea compound and the second urea compound is 90 weight % or more of the total amount of the color developing agents contained in the thermosensitive recording layer.

30 . The thermosensitive recording medium of claim 12 , wherein further a protective layer is installed on the thermosensitive recording layer.

Assignees

• Jujo Paper Co Ltd

Inventors

• Hirai Kenji
• Kawasaki Kentaro
• Murata Yuka
• Midorikawa Yoshimi

Classifications

• B41M5/3333 Primary

  Non-macromolecular compounds · CPC title

• B41M5/323 Primary

  Organic colour formers, e.g. leuco dyes · CPC title

• B41M2205/40

  Cover layers; Layers separated from substrate by imaging layer; Protective layers; Layers applied before imaging · CPC title

• B41M5/42

  Intermediate, {backcoat}, or covering layers {(B41M5/405 takes precedence; multilayer thermal transfer systems in general B41M5/38214)} · CPC title

• B41M2205/04

  Direct thermal recording [DTR] · CPC title