Thermosensitive recording medium

Patent metadata

Field	Value
Publication number	US-10464362-B2
Application number	US-201615770053-A
Country	US
Kind code	B2
Filing date	Oct 19, 2016
Priority date	Oct 23, 2015
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

As a thermosensitive recording medium utilizes a coloring reaction between a colorless or pale colored electron donating leuco dye and an electron accepting color developing agent, a thermosensitive recording medium using an environment-friendly color developing agent is provided. Provided 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 comprises a gluconolactone as the electron accepting color developing agent.

First claim

What is claimed is:

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 comprises a gluconolactone as the electron accepting color developing agent.

2. The thermosensitive recording medium of claim 1 , wherein the solid content of the gluconolactone in the thermosensitive recording layer is from 1 to 18 weight %.

3. The thermosensitive recording medium of claim 1 , wherein the weight ratio of the electron accepting color developing agent to the electron donating leuco dye is from 0.05 to 4.0.

4. The thermosensitive recording medium of claim 1 , further comprising
a color developing agent having a urea structure (—NHCONH—) as the electron accepting color developing agent.

5. The thermosensitive recording medium of claim 4 , wherein the weight ratio of the gluconolactone to the color developing agent having a urea structure (—NHCONH—) in the electron accepting color developing agent is 40/60 or more.

6. The thermosensitive recording medium of claim 2 , wherein the weight ratio of the electron accepting color developing agent to the electron donating leuco dye is from 0.05 to 4.0.

7. The thermosensitive recording medium of claim 2 , further comprising a color developing agent having a urea structure (—NHCONH—) as the electron accepting color developing agent.

8. The thermosensitive recording medium of claim 7 , wherein the weight ratio of the gluconolactone to the color developing agent having a urea structure (—NHCONH—) in the electron accepting color developing agent is 40/60 or more.

9. The thermosensitive recording medium of claim 3 , further comprising a color developing agent having a urea structure (—NHCONH—) as the electron accepting color developing agent.

10. The thermosensitive recording medium of claim 9 , wherein the weight ratio of the gluconolactone to the color developing agent having a urea structure (—NHCONH—) in the electron accepting color developing agent is 40/60 or more.

Assignees

• Jujo Paper Co Ltd

Inventors

• Matsumori Yasuaki
• Ogino Akihito
• Hirai Kenji

Classifications

• B41M5/3333

  Non-macromolecular compounds · CPC title

• B41M5/3335

  Compounds containing phenolic or carboxylic acid groups or metal salts thereof · CPC title

• B41M5/305

  with reversible electron-donor electron-acceptor compositions · CPC title

• B41M5/41

  Base layers {supports or substrates} · CPC title

• B41M3/142

  using chemical colour-formers or chemical reactions, e.g. leuco-dye/acid, photochromes · CPC title