System with salt-based color adjustment of substrate

Patent metadata

Field	Value
Publication number	US-12197059-B2
Application number	US-202318192248-A
Country	US
Kind code	B2
Filing date	Mar 29, 2023
Priority date	Mar 30, 2022
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

In a first aspect, the present disclosure relates to a system comprising a writing instrument, wherein the writing instrument comprises a solution of one or more salts and a writing orifice. Furthermore, the system comprises a drawing substrate configured to change color based on the concentration of the one or more salts and/or water content, wherein the drawing substrate comprises cholesteric liquid-crystals.

First claim

The invention claimed is:

1. A system comprising:
a writing instrument, wherein the writing instrument comprises a solution of one or more salts and a writing orifice; and
a drawing substrate configured to change color based on the concentration of the one or more salts and/or water content,
wherein the drawing substrate comprises cholesteric liquid-crystals and wherein the drawing substrate is configured to absorb water.

2. The system according to claim 1 , wherein the one or more salts comprise a cation capable of forming a chelation complex.

3. The system according to claim 1 , wherein the one or more salts comprise a cation capable of forming a chelation complex with one or more carboxylic groups.

4. The system according to claim 1 , wherein the one or more salts comprise an alkaline earth metal salt.

5. The system according to claim 1 , wherein the one or more salts comprise a calcium salt.

6. The system according to claim 1 , wherein the one or more salts comprise a monovalent anion.

7. The system according to claim 1 , wherein the one or more salts comprise a nitrite.

8. The system according to claim 1 , wherein the one or more salts comprise Ca(NO3)2.

9. The system according to claim 1 , wherein the one or more salts comprise at least 85% of the calcium salt, relative to the total weight of the one or more salts.

10. The system according to claim 1 , wherein the cholesteric liquid crystals comprise cholesteric liquid crystal polymers.

11. The system according to claim 1 , wherein the cholesteric liquid crystals comprise 1,4-Bis-[4-(3-acryloyloxypropyloxy) benzoyloxy]-2-Methylbenzene, 4-Methoxyphenyl 4-((6-(acryloyloxy) hexyl)oxy)benzoate, 4-(acryloyloxyhexyloxy) benzoic acid, 2-Methyl-4-[6-(acryloyloxy) hexyloxy]benzoic acid, 4-Cyano-4′-pentylbiphenyl, 1,4:3,6-Dianhydro-D-glucitol bis[4-[4-[[4-[(1-oxo-2-propenyl)oxy]butoxy]carbonyl]oxy]benzoyl]oxy]benzoate], and/or 1,2-Diphenyl-2,2-dimethoxyethanone.

12. The system according to claim 1 , wherein the drawing substrate comprises a water-absorbing layer comprising poly(N-isopropylacrylamide) and/or cellulose acetate nanofibers.

13. The system according to claim 1 , wherein the drawing substrate is configured to be adhesive.

14. The system according to claim 1 , wherein the concentration of the one or more salts in the solution is between about 0.01 mM to about 100 mM.

15. The system according to claim 1 , wherein the system comprises a spraying mechanism configured to create an aerosol.

16. A method for manufacturing a drawing substrate as defined in claim 1 , wherein the method comprises:
dissolving one or more mesogens in a first solvent;
applying the one or more mesogens to a carrier structure;
evaporating the first solvent;
shearing the mesogens along one direction;
curing the one or more mesogens by exposure to UV-light;
rinsing the cured one or more mesogens with a second solvent;
rinsing the cured one or more mesogens with KOH.

17. A system comprising:
a writing instrument, wherein the writing instrument comprises a solution of one or more salts and a writing orifice; and
a drawing substrate configured to change color based on the concentration of the one or more salts and/or water content,
wherein the drawing substrate comprises cholesteric liquid-crystals, and
wherein the writing instrument comprises an ink container, a first water container comprising at least water, and a mixing chamber fluidly connected to the ink container, the first water container and the writing orifice.

18. A system comprising:
a writing instrument, wherein the writing instrument comprises a solution of one or more salts and a writing orifice; and
a drawing substrate configured to change color based on the concentration of the one or more salts and/or water content,
wherein the drawing substrate comprises cholesteric liquid-crystals, and
wherein the writing instrument comprises a concentration adjustment mechanism, wherein the concentration adjustment mechanism is configured to adjust the concentration of the one or more salts in the solution dispensed by the writing instrument.

Assignees

• Bic Violex Single Member Sa

Inventors

• Chrysanthakopoulos Nikolaos

Classifications

• G02F1/13718

  based on a change of the texture state of a cholesteric liquid crystal · CPC title

• G02F1/133723

  Polyimide, polyamide-imide · CPC title

• G02F1/1313

  specially adapted for a particular application · CPC title

• G02F1/133311

  Environmental protection, e.g. against dust or humidity · CPC title

• G06F3/04162

  for exchanging data with external devices, e.g. smart pens, via the digitiser sensing hardware · CPC title