Thermal recording material

Patent metadata

Field	Value
Publication number	US-9834022-B2
Application number	US-201515109678-A
Country	US
Kind code	B2
Filing date	Jan 16, 2015
Priority date	Jan 27, 2014
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

An object of the present invention is to provide a thermal recording material which is excellent in all of the following characteristics: plasticizer resistance, image stability against moisture and heat, the resistance to background fogging under moisture and heat, and the retention of color developing ability. Provided is a thermal recording material having, on a paper support, a heat-sensitive recording layer containing a colorless or light-colored dye precursor and a developer which reacts with the dye precursor on heating and converts the dye precursor to its colored form, the paper support containing 0.25 to 1.0% by mass of a neutral rosin sizing agent relative to the pulp solid content in combination with calcium carbonate and aluminum sulfate, the developer having a phenylureido moiety in its molecule.

First claim

The invention claimed is:

1. A thermal recording material having, on a paper support, a heat-sensitive recording layer containing a colorless or light-colored dye precursor and a developer which reacts with the dye precursor on heating and converts the dye precursor to its colored form, the paper support containing 0.25 to 1.0% by mass of a neutral rosin sizing agent relative to the pulp solid content in combination with calcium carbonate and aluminum sulfate, the developer having a phenylureido moiety in its molecule.

2. The thermal recording material according to claim 1 , wherein the phenylureido moiety is represented by the following general formula (1):

(wherein R1 and R3 are hydrogen atoms, R2 is an oxygen atom, R4 is selected from a hydrogen atom and a group that can be a substituent on the benzene ring, and n is an integer of 1 to 5).

3. The thermal recording material according to claim 2 , wherein the paper support further contains polyacrylamide.

4. The thermal recording material according to claim 3 , wherein the polyacrylamide is an amphoteric polyacrylamide in which the ratio of cationic groups to anionic groups is 50 to 200%.

5. The thermal recording material according to claim 1 , wherein the developer is a compound represented by the following general formula (2):

(wherein X 1 is —NHCONH—, X 2 is —NHSO 2 —, and each of the three benzene rings may have a substituent(s)).

6. The thermal recording material according to claim 5 , wherein the developer is N-[2-(3-phenylureido)phenyl]benzenesulfonamide.

7. The thermal recording material according to claim 6 , wherein the paper support further contains polyacrylamide.

8. The thermal recording material according to claim 7 , wherein the polyacrylamide is an amphoteric polyacrylamide in which the ratio of cationic groups to anionic groups is 50 to 200%.

9. The thermal recording material according to claim 5 , wherein the paper support further contains polyacrylamide.

10. The thermal recording material according to claim 9 , wherein the polyacrylamide is an amphoteric polyacrylamide in which the ratio of cationic groups to anionic groups is 50 to 200%.

11. The thermal recording material according to claim 1 wherein the paper support further contains polyacrylamide.

12. The thermal recording material according to claim 11 , wherein the polyacrylamide is an amphoteric polyacrylamide in which the ratio of cationic groups to anionic groups is 50 to 200%.

13. The thermal recording material according to claim 1 , wherein a backcoat layer containing a hydrophobic resin is provided on the opposite side of the paper support from the heat-sensitive recording layer.

Assignees

• Mitsubishi Paper Mills Ltd

Inventors

• Morita Kunio

Classifications

• B41M5/3333 Primary

  Non-macromolecular compounds · CPC title

• B41M5/41

  Base layers {supports or substrates} · CPC title

• B41M5/30

  using chemical colour formers (B41M5/34 takes precedence) · CPC title

• B41M2205/04

  Direct thermal recording [DTR] · CPC title