Thermosensitive recording material

Patent metadata

Field	Value
Publication number	US-9932487-B2
Application number	US-201615366102-A
Country	US
Kind code	B2
Filing date	Dec 1, 2016
Priority date	Dec 4, 2015
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

The present invention relates to a thermosensitive recording material comprising paper, an undercoat layer disposed on the paper, and a thermosensitive recording layer disposed on the undercoat layer, wherein the undercoat layer comprises a binder and first and second hollow sphere polymer particles, wherein the first hollow sphere polymer particles have a diameter in the range of from 1.2 μm to 1.8 μm; the second hollow sphere polymer particles have a diameter in the range of from 0.25 μm to 1.0 μm; the number ratio of the second to the first hollow sphere polymer particles is in the range of from 1:1 to 20:1; the diameter of the second hollow sphere polymer particles is in the range of from 15 to 65% of the diameter of the first hollow sphere polymer particles; the dry bulk density of the first hollow sphere polymer particles is in the range of 0.25 to 0.5 g/mL; and the dry bulk density of the second hollow sphere polymer particles is in the range of 0.30 to 0.90 g/mL.

First claim

The invention claimed is:

1. A thermosensitive recording material comprising paper, an undercoat layer disposed on the paper, and a thermosensitive recording layer disposed on the undercoat layer, wherein the undercoat layer comprises a binder and first and second hollow sphere polymer particles, wherein:
a) the first hollow sphere particles have a diameter in the range of from 1.0 μm to 1.8 μm;
b) the second hollow sphere particles have a diameter in the range of from 0.25 to 1 μm;
c) the number ratio of the second to the first hollow sphere polymer particles is in the range of from 1:1 to 20:1;
d) the diameter of the second hollow sphere polymer particles is in the range of from 15 to 65 percent of the diameter of the first hollow sphere polymer particles;
e) the dry bulk density of the first hollow sphere polymer particles is in the range of 0.25 to 0.5 g/mL; and
f) the dry bulk density of the second hollow polymer particles is in the range of 0.30 to 0.90 g/mL.

2. The thermosensitive recording material of claim 1 wherein the first hollow sphere polymer particles have a diameter in the range of from 1.2 μm to 1.8 μm; and the second hollow sphere polymer particles have a diameter in the range of from 0.3 μm to 0.8 μm; wherein the number ratio of the second to the first hollow sphere polymer particles is in the range of from 2:1 to 15:1; wherein the diameter of the second hollow polymer particles in the range of from 20 to 40% of the diameter of the first hollow sphere polymer particles.

3. The thermosensitive recording material of claim 2 wherein the first hollow sphere polymer particles have a diameter in the range of from 1.3 μm to 1.7 μm; and the second hollow sphere polymer particles have a diameter in the range of from 0.35 μm to 0.6 μm; wherein the number ratio of the second to the first hollow sphere polymer particles is in the range of from 3:1 to 12:1; wherein the diameter of the second hollow sphere polymer particles in the range of from 25 to 33% of the diameter of the first hollow sphere polymer particles.

4. The thermosensitive recording material of claim 3 the second hollow sphere polymer particles have a diameter in the range of from 0.4 μm to 0.5 μm; wherein the number ratio of the second to the first hollow sphere polymer particles is in the range of from 4:1 to 10:1; wherein the diameter of the second hollow sphere polymer particles is in the range of from 27 to 30% of the diameter of the first hollow sphere polymer particles; and wherein the first hollow sphere polymer particles have a diameter in the range of from 1.4 μm to 1.6 μm.

5. The thermosensitive recording material of claim 2 wherein the dry bulk density of the first hollow sphere polymer particles is in the range of 0.30 to 0.45 g/mL; and the dry bulk density of the second hollow sphere polymer particles is in the range of 0.40 to 0.80 g/mL.

6. The thermosensitive recording material of claim 3 wherein the dry bulk density of the first hollow sphere polymer particles is in the range of 0.35 to 0.40 g/mL; and the dry bulk density of the second hollow sphere polymer particles is in the range of 0.50 to 0.75 g/mL.

7. The thermosensitive recording material of claim 4 wherein the dry bulk density of the first hollow sphere polymer particles is in the range of 0.35 to 0.40 g/mL; and the dry bulk density of the second hollow sphere polymer particles is in the range of 0.55 to 0.65 g/mL.

8. The thermosensitive recording material of claim 1 wherein the dried coat weight of the undercoat layer is in the range of from 1 to 25 g/m 2 , and the thickness of the recording layer is in the range of from 1 g/m 2 to 20 g/m 2 .

9. The thermosensitive recording material of claim 1 wherein the dried coat weight of the undercoat layer is in the range of from 2 to 6 g/m 2 , and the thickness of the recording layer is in the range of from 1 g/m 2 to 10 g/m 2 .

Assignees

• Dow Global Technologies Llc
• Rohm & Haas

Inventors

• Einsla Brian R
• Ginzburg Valeriy V
• Li Lanfang
• Roper Iii John A
• Smith Rebecca
• Yang Jian

Classifications

• C09D125/14

  with unsaturated esters · CPC title

• C09D7/1283

  Chemistry & Metallurgy · mapped topic

• B41M2205/38

  Intermediate layers; Layers between substrate and imaging layer · CPC title

• C09D7/1291 Primary

  Chemistry & Metallurgy · mapped topic

• C09D7/1275

  Chemistry & Metallurgy · mapped topic