Microdisperse polymer/liquid crystal composite

• US 4,869,847 A
• Filed: 03/16/1987
• Issued: 09/26/1989
• Est. Priority Date: 03/16/1987
• Status: Expired due to Term

• Current Assignee: Corning Incorporated
• Original Assignee: Hoechst Celanese Corporation (Sanofi )
• Inventors: Khanarian, Garo, Leslie, Thomas M.
• Primary Examiner(s): Kalafut, Stephen J.
• Application Number:
  US07/026,404
• Time in Patent Office: 925 Days
• Field of Search: 928/1, 252/583, 252/299.01, 252/299.7, 523/223
• US Class Current: 252/299.01
• CPC Class Codes: C09K 19/544 as dispersing or encapsulating medium around the liquid crystal
• CPC Class Codes: G02F 1/1334 based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
• CPC Class Codes: G02F 1/216 using liquid crystals, e.g. liquid crystal Fabry-Perot filters
• CPC Class Codes: G02F 1/3615 containing polymers

Abstract

A novel composite of liquid crystal droplets having a diameter of no more than 0.1 micron dispersed in a synthetic resin matrix is disclosed. The novel material does not scatter light to any appreciable degree.

Claims

1. A material which is incapable of substantially scattering visible light comprising droplets of a liquid crystal dispersed in a light-transmissive polymer matrix, said liquid crystal being soluble in the matrix-forming composition and said droplets being spontaneously formed from solution in the composition during solidification thereof wherein at least 85% of said droplets have a diameter no greater than 0.1 micron.

2. The material of claim 1 wherein the liquid crystal is present in an amount of from 25-40 weight percent.

3. The material of claim 1 wherein the liquid crystal is present in an amount of from 30-35 weight percent.

4. The material of claim 2 wherein the droplet size ranges between 0.05±

0.02 microns.

5. The material of claim 3 wherein the droplet size ranges between 0.05±

0.02 microns.

6. The material of claim 1 wherein the polymer is a thermosetting resin.

7. The material of claim 2 wherein the polymer is a thermosetting resin.

8. The material of claim 6 wherein the polymer is an epoxy resin.

9. The material of claim 7 wherein the polymer is an epoxy resin.

10. The material of claim 8 wherein the liquid crystal material comprises a cyanobiphenyl.

11. The material of claim 9 wherein the liquid crystal material comprises a cyanobiphenyl.

12. The material of claim 1 wherein the polymer is a thermoplastic resin.

13. The material of claim 3 wherein the polymer is a thermoplastic resin.

14. The material of claim 12 wherein he polymer is an acrylate.

15. The material of claim 13 wherein the polymer is an acrylate.

16. The material of claim 14 wherein the liquid crystal material is a cyanobiphenyl.

17. The material of claim 15 wherein the liquid crystal material is a cyanobiphenyl.