THERMOMETRIC ARTICLES AND METHODS FOR PREPARING SAME

• US 3,619,254 A
• Filed: 03/18/1969
• Issued: 11/09/1971
• Est. Priority Date: 03/18/1969
• Status: Expired due to Term

• Current Assignee: E-Z-EM Incorporated (Bracco SPA)
• Original Assignee: Frederick Davis
• Inventors: Davis, Frederick
• Primary Examiner(s): Martin, William D.
• Assistant Examiner(s): Husack, Ralph
• Application Number:
  US04/808,319
• Time in Patent Office: 966 Days
• Field of Search: 252/408 23/23LC 161/410 350/16P 117/72,33.3,81,87
• US Class Current: 374/162
• CPC Class Codes: B44F 1/00 Designs or pictures characterised by special or unusual light effects
• CPC Class Codes: G01K 11/16 of organic materials
• CPC Class Codes: G09F 9/35 being liquid crystals G09F9/302 takes precedence; liquid crystal materials C09K19/00; liquid crystal panels comprising a number of electrodes in a single cell per se G02F1/13
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/265 1 mil or less

Abstract

Thermometric articles comprising a substrate, a coating of a cholesteric composition on the substrate, and a coating of a solid on the cholesteric composition, the solid being immiscible and unreactive with the cholesteric composition; and methods for preparing such articles.

Claims

2. An article according to claim 1 wherein the immiscible material is overcoated with a solid polymer film which is insoluble in water.

3. An article as in claim 2 wherein the immiscible material is casein glue and the solid polymer is an acrylic resin.

4. An article according to claim 1 wherein the substrate is an organic polymer film adhering to a solid base.

5. An article according to claim 4 wherein the substrate is of low reflectance.

6. An article according to claim 4 wherein the base is of low reflectance.

7. An article according to claim 1 wherein the immiscible material is light-transmitting.

8. An article according to claim 1 wherein the substrate is light-transmitting and the immiscible material is opaque.

9. A process for preparing thermosensing articles comprising coating a first layer of a cholesteric composition on a substrate, coating a second layer of a viscous liquid, film-forming lipophobic composition immiscible with said cholesteric composition on said first layer and allowing said lipophobic composition to dry, wherein said first layer is 10 microns to 10 mils thick and said second layer is at least 1/4 -mil thick.

10. A process according to claim 9 wherein the first layer is 0.5 to 5 mils thick and the second layer is 2 to 10 mils thick.

11. A process according to claim 9 wherein the second layer is rapidly heated to form at least a thin film of solid material on said first layer.

12. A process according to claim 11 wherein the second layer is cured after the rapid heating until it is fully set.

13. A process according to claim 12 wherein the cured second layer is coated with a solid polymer protective layer.

14. A process as in claim 13 wherein the cured second layer is casein glue and the protective layer is an acrylic resin.

15. A process according to claim 9 wherein the second layer is covered with a solid polymer protective layer.