Preparation of liquid crystal containing polymeric structure

• US 4,101,207 A
• Filed: 04/18/1977
• Issued: 07/18/1978
• Est. Priority Date: 02/12/1973
• Status: Expired due to Term

• Current Assignee: Owens Illinois Television Products Inc (Nippon Electric Glass Company Limited)
• Original Assignee: Owens-Illinois Incorporated (O-I Glass, Inc.)
• Inventors: Taylor, Lynn J.
• Primary Examiner(s): Bauer, Edward S.
• Application Number:
  US05/788,577
• Time in Patent Office: 456 Days
• Field of Search: 350/160 LC, 252/299
• US Class Current: 349/89
• CPC Class Codes: C08K 5/0008 Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
• CPC Class Codes: C09K 19/544 as dispersing or encapsulating medium around the liquid crystal

Abstract

There is disclosed the preparation of a liquid crystal containing structure by incorporating a liquid crystal substance into a polymeric matrix so as to form a thin, layer-like structure of controlled thickness. The resulting structure is highly suitable for use in display and/or memory devices or other devices utilizing liquid crystal properties.

Claims

1. As an article of manufacture, an electronic display device comprising:

(a) at least one base member,

(b) a thin, layer-like structure of controlled thickness supported on a surface of said base member,

(c) said structure comprising poly(ethylene oxide) in matrix form and N,N'"'"'-bis(p-n-octyloxybenzylidene)-2-chloro-1,4-phenylenediamine nematic liquid-crystal material;

(d) said nematic liquid-crystal material being dispersed in said poly(ethylene oxide) matrix in intimate contact therewith, and said poly(ethylene oxide) being chemically and physically inert relative to the contained liquid-crystal material, and

(e) means for applying an electric field to selected areas of said structure to produce a dynamic scattering effect in said nematic liquid-crystal materail.

2. The article of claim 1 wherein the poly(ethylene oxide) has a molecular weight of about 10,000 to about 200,000.

3. The article of claim 1 wherein the weight ratio of liquid-crystal material to poly(ethylene oxide) matrix ranges between about 1:

4 and 4;

1.

4. The article of claim 1 in the form of a thin film having an overall thickness in the range from about 0.25 mil to about 2.5 mils.

5. As an article of manufacture, an electronic display device comprising a thin layer of N,N'"'"'-bis(p-n-octyloxybenzylidene)-2-chloro-1,4-phenylenediamine nematic liquid-crystal material and poly(ethylene oxide) in matrix form, said nematic liquid-crystal material being dispersed in said poly(ethylene oxide) matrix in intimate contact therewith and said poly(ethylene oxide) being chemically and physically inert relative to the contained liquid-crystal material, said layer being supported on the surface of at least one base member, and means for applying an electric field to selected areas of the thin layer to produce a dynamic scattering effect in said nematic liquid-crystal material.