IP Library › Granted Patent US 6,848,795
Granted Patent B2
US 6,848,795 · App. 10/279,599 · Granted Feb 1, 2005

Increased contrast overhead projection films

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Quick Facts
Patent No.
US 6,848,795
App. No.
10/279,599
Granted
Feb 1, 2005
Kind
B2
Abstract

Disclosed is a projection media comprising a transparent polymer layer with random light diffusing elements and having a Tg of less than 75° C.

Claims (25)

1. A projection media comprising a transparent polymer layer with random light diffusing elements in the form of complex lenses and having a Tg of less than 75° C. and a light transmission of at least 85%.

2. The projection media of claim 1 wherein the diffusing elements have an average peak to valley height of no more than 10 micrometers.

3. The projection media of claim 1 wherein the diffusing elements have an aspect ratio of between 0.1 and 1.0.

4. The projection media of claim 1 wherein the light diffusing elements contain titanium dioxide particles less than 30 nanometers.

5. The projection media of claim 1 wherein the light diffusing elements have a Tg of no more then 55° C.

6. The projection media of claim 1 wherein the polymer layer comprises a dye receiving layer.

7. The projection media of claim 1 wherein the polymer layer comprises an UV curable polymer.

8. The projection media of claim 1 wherein the polymer layer comprises a polyolefin.

9. The projection media of claim 1 wherein the polymer layer comprises a polyester.

10. The projection media of claim 1 wherein the polymer layer comprises a polycarbonate.

11. The projection media of claim 1 wherein the polymer layer further comprises dye or pigment.

12. The projection media of claim 1 wherein the polymer layer contains a colorant.

13. The projection media of claim 1 wherein the projection media comprises a transparent substrate.

14. The projection media of claim 1 wherein the projection media has a haze of at least 70%.

15. The projection media of claim 1 wherein the projection media further comprises a pressure sensitive adhesive.

16. The projection media of claim 1 wherein the projection media, when projected, has a contrast level of at least 300:1.

17. The projection media of claim 1 comprising specular areas of transmission.

18. The projection media of claim 17 wherein the specular areas are colored.

19. The projection media of claim 18 wherein the colored specular areas comprise dye.

20. A process for projecting an image comprising subjecting the media of claim 17 to transmitted light, condensing the light into a projection lens unit, and projecting the light to a projection screen.

21. A process for writing on a projection media of claim 1 comprising applying heat and/or pressure to selectively create areas of specular transmission.

22. The process of claim 21 wherein the heat and/or pressure is applied by a resistive thermal head.

23. The process of claim 21 wherein the process for writing on a projection media comprises adding color to the areas of specular transmission.

24. The process of claim 23 wherein the added color is dye based.

25. The process of claim 21 wherein the areas of specular transmission comprise text, shapes, or images.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 30, 2007
From: EASTMAN KODAK COMPANY
To: ROHM AND HAAS DENMARK FINANCE A/S
Reel/Frame 019805/0043 →