Laser-imageable coating based on exothermic decomposition

• US 20070065623A1
• Filed: 09/21/2005
• Published: 03/22/2007
• Est. Priority Date: 09/21/2005
• Status: Abandoned Application

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Gore, Makarand, Kasperchik, Vladek, Khavarj, Mehrgan
• Application Number:
  US11/232,066
• Publication Number:
  US 20070065623A1
• Time in Patent Office: Days
• US Class Current: 428/64.400
• CPC Class Codes: G11B 2007/24322 Nitrogen
• CPC Class Codes: G11B 7/243 comprising inorganic materials only, e.g. ablative layers
• CPC Class Codes: G11B 7/244 comprising organic materials only
• CPC Class Codes: G11B 7/245 containing a polymeric component
• CPC Class Codes: G11B 7/252 of layers other than recording layers
• CPC Class Codes: G11B 7/2531 comprising glass
• CPC Class Codes: G11B 7/2533 comprising resins
• CPC Class Codes: G11B 7/2542 consisting essentially of organic resins
• CPC Class Codes: G11B 7/2572 consisting essentially of organic materials

Abstract

An optical recording medium comprises a substrate, an imaging layer comprising a compound that decomposes exothermically when heated to a predetermined temperature, and, optionally, a color layer.

Claims

1. An optical recording medium, comprising:

a substrate,

an imaging layer supported on said substrate and comprising a compound that decomposes exothermically when heated to a predetermined temperature; and

optionally, a color layer between said substrate and said imaging layer.

2. The optical recording medium of claim 1 wherein the imaging layer comprises an organic nitrogen compound.

3. The optical recording medium of claim 1 wherein the imaging layer comprises a compound selected from the group consisting of nitrocellulose, nitrostarch, nitrated sugars, polyvinyl nitrate, polynitropolyphenylene, glycidyl azide polymer, azides, peroxides, potassium, sodium and tertan-butylammonium, ammonium nitrates, and combinations thereof.

4. The optical recording medium of claim 1 wherein the imaging layer further includes a colorant.

5. The optical recording medium of claim 1 wherein said imaging layer further includes a binder.

6. The optical recording medium of claim 1 wherein said imaging layer further includes a light-absorbing antenna.

7. The optical recording medium of claim 1, further including a topcoat on said imaging layer.

8. A means for providing human-readable and machine-readable marks on an optical recording medium, comprising:

first means for recording machine-readable marks on said medium in response to an optical signal;

second means for recording human-readable marks on said medium, said second means including an imaging layer that produces a human-detectable optical change when heated to a threshold temperature, wherein said imaging layer comprises an imaging compound that decomposes exothermically when heated to said threshold temperature.

9. The recording means of claim 8 wherein the imaging layer comprises an organic nitrogen compound.

10. The recording means of claim 8 wherein the imaging layer comprises a compound selected from the group consisting of nitrocellulose, nitrostarch, nitrated sugars, polyvinyl nitrate, polynitropolyphenylene, glycidyl azide polymer, and combinations thereof.

11. The recording means of claim 8 wherein the imaging layer further includes a colorant.

12. The recording means of claim 8 wherein said imaging layer further includes a binder.

13. The recording means of claim 8 wherein said imaging layer further includes a light-absorbing antenna.

14. The recording means of claim 8, further including a topcoat on said imaging layer.

15. A system, comprising:

a processor,

a laser coupled to said processor;

a data storage medium including a substrate having a first surface that can be marked with machine-readable marks by said laser and a second surface that can be marked with human-readable marks by said laser, said second surface including an imaging layer thereon, said imaging composition comprising;

an imaging compound that decomposes exothermically when heated to said threshold temperature; and

optionally, a color layer between said second surface and said imaging layer.

16. The system of claim 15 wherein the imaging layer comprises an organic nitrogen compound.

17. The system of claim 15 wherein the imaging layer comprises a compound selected from the group consisting of nitrocellulose, nitrostarch, nitrated sugars, polyvinyl nitrate, polynitropolyphenylene, glycidyl azide polymer, and combinations thereof.

18. The system of claim 15 wherein the imaging layer further includes a colorant.

19. The system of claim 15 wherein said imaging layer further includes a binder.

20. The system of claim 15 wherein said imaging layer further includes a light-absorbing antenna.

21. The system of claim 15, further including a topcoat on said imaging layer.

22. A method for creating an optical recording medium on a substrate, comprising:

a) providing a first coating on a first part of the substrate surface, said first coating forming machine-readable marks in response to incident light having a predetermined wavelength; and

b) providing a second coating on a second part of the substrate surface, said second coating forming human-readable marks in when heated to a threshold temperature by;

providing material that decomposes exothermically at said threshold temperature in a solvent to form a coating;

applying the coating to the surface of the substrate;

allowing the solvent to evaporate.

23. The method of claim 22 wherein the imaging layer comprises an organic nitrogen compound.

24. The method of claim 22 wherein the imaging layer comprises a compound selected from the group consisting of nitrocellulose, nitrostarch, nitrated sugars, polyvinyl nitrate, polynitropolyphenylene, glycidyl azide polymer, and combinations thereof.

25. The method of claim 22 wherein the imaging layer further includes a colorant.

26. The method of claim 22 wherein said imaging layer further includes a binder.

27. The method of claim 22 wherein said imaging layer further includes a light-absorbing antenna.

28. The method of claim 22, further the step of

c) applying a topcoat to said second layer.