Writing gel ink

Patent metadata

Field	Value
Publication number	US-11891530-B2
Application number	US-201816956038-A
Country	US
Kind code	B2
Filing date	Dec 19, 2018
Priority date	Dec 21, 2017
Publication date	Feb 6, 2024
Grant date	Feb 6, 2024

Abstract

The present disclosure concerns non-aqueous gel writing ink including a solvent, a coloring agent and a gelling agent, in which the gelling agent is a mixture of silica particles and of a fatty acid amide wax. It also concerns the process of preparation of the non-aqueous gel writing ink and the use of a mixture of silica particles and of a fatty acid amide wax, as a gelling agent in a non-aqueous gel writing ink. It finally concerns a writing instrument containing the ink according to the present disclosure.

First claim

The invention claimed is:

1. A non-aqueous gel writing ink comprising a solvent, a coloring agent and a gelling agent, wherein the gelling agent comprises a mixture of silica particles and of a fatty acid amide wax, and wherein the fatty acid amide wax includes octadecanamide of the following formula:

2. A non-aqueous gel writing ink according to claim 1 , wherein the fatty acid amide wax further
N,N′-Ethylene-bis-12-hydroxystearamide of the following formula CH 3 (CH 2 ) 5 CHOH(CH 2 ) 10 CONH(CH 2 ) 2 NHCO(CH 2 ) 10 CHOH(CH 2 ) 5 CH 3 and
N,N′-Ethylenebis(caprinamide) of the following formula CH 3 (CH 2 ) 8 CONH(CH 2 ) 2 NHCO(CH 2 ) 8 CH 3.

3. A non-aqueous gel writing ink according to claim 1 , wherein the gelling agent content is in the range 0.1-1.2%, by weight, relative to the total weight of the ink.

4. A non-aqueous gel writing ink according to claim 1 , wherein the solvent is chosen in the group consisting of glycol ether, alcohol, and mixture thereof.

5. A non-aqueous gel writing ink according to claim 1 , wherein the solvent content is between 35 and 80% by weight, relative to the total weight of the ink.

6. A non-aqueous gel writing ink according to claim 1 , wherein the coloring agent is a dye.

7. A non-aqueous gel writing ink according to claim 1 , wherein the coloring agent content is between 5 and 30% by weight relative to the total weight of the ink.

8. A non-aqueous gel writing ink according to claim 1 , wherein it contains additives.

9. A non-aqueous gel writing ink according to claim 1 , wherein its viscosity measured at 20° C. with a cone-and-plate rheometer is of between 20 000 and 100 000 mPa·s, with a shear rate of 0.01s −1 and between 1500 and 15 000 mPa·s, with a shear rate of 100s −1 .

10. A non-aqueous gel writing ink according to claim 1 , wherein its viscosity is stable during storage for at least three months at 40° C. and 80% relative humidity.

11. Process for manufacturing a non-aqueous gel writing ink according to claim 1 , wherein the fatty acid amide wax is activated by formation of a premix in a solvent, at a temperature of between 30 and 70° C., with a shear rate of between 20 and 25 m/s, before its addition in the writing ink containing the solvent, the silica particles and the coloring agent.

12. Process for manufacturing the non-aqueous gel writing ink according to claim 11 , wherein the premix is added to the ink at a temperature of between 50 and 60° C.

13. A writing instrument containing a non-aqueous gel writing ink according to 1 .

14. A non-aqueous gel writing ink according to claim 1 , wherein the gelling agent comprises a mixture of hydrophilic silica particles and of a fatty acid amide wax.

15. A non-aqueous gel writing ink according to claim 1 , wherein the gelling agent content is in the range 0.15-0.60%, by weight, relative to the total weight of the ink.

16. A non-aqueous gel writing ink according to claim 4 , wherein the solvent is phenoxyethanol.

17. A non-aqueous gel writing ink according to claim 8 , wherein the additives are chosen in the group consisting of thickening agents, clear drain agents, viscosity imparting agent, lubricant, dispersing agent and mixture thereof.

Assignees

• SOCIéTé BIC

Inventors

• Caffier Guillaume
• Damiano Anne-Lise
• Debrauwer Christelle
• Evrard Claire
• Liu Wing Yam

Classifications

• C09D11/18 Primary

  specially adapted for ball-point writing instruments · CPC title

• C08K3/36

  Silica · CPC title

• C08K5/0041

  Optical brightening agents, organic pigments · CPC title

• C08K5/05

  Alcohols; Metal alcoholates · CPC title

• C08K5/20

  Carboxylic acid amides · CPC title