Patent US4916913A successfully refreshed from Google Patents.
US4965017A
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Liquid crystal devices
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1988-07-13
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Granted: 1990-10-23
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Expires: 2008-07-13
Abstract
Abstract An alignment layer for a liquid crystal display consists at least substantially of a polyphenylene polymer wherein at least 80% of the said polyphenylene polymer is composed of aromatic phenylene rings. The alignment layer is capable of providing a homogeneous alignment of liquid crystal molecules disposed adjacent thereto with a high tilt bias angle.
Inventors
- 👤 Paul Holmes
- 👤 Alan Nevin
- 👤 Hermann Amstutz
- 👤 Jurgen Nehring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:57
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; C; C08; C08G; C08G61/00; C08G61/02; C08G61/10; G02F1/133711; C08G2261/00; C08G2261/30; C08G2261/31; C08G2261/312; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31931
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
41 words
A liquid crystal alignment layer supported upon a substrate, said alignment layer consisting essentially of a polyphenylene polymer prepared from a poly(1,2-disubstituted-cyclohexa-3,5-diene) prepolymer by aromatisation thereof to convert at least 98% of the 1,2-disubstituted-cyclohex-4-enylene rings of the prepolymer into phenylene rings.
Claim 2
Dependent Claim
41 words
A liquid crystal alignment layer supported upon a substrate, said alignment layer consisting essentially of a polyphenylene polymer prepared from a poly(1,2-disubstituted-cyclohexa-3,5-diene) prepolymer by aromatisation thereof to convert at least 98% of the 1,2-disubstituted-cyclohex-4-enylene rings of the prepolymer into phenylene rings.
Claim 3
Dependent Claim
17 words
A liquid crystal device comprising an alignment layer as claimed in claim 1. prepared from a poly(1,2-disubstituted-cyclohexa-3,5-diene).
Claim 4
Dependent Claim
16 words
An alignment layer as claimed in claim 1 wherein the poly(1,2-disubstituted-cyclohexa-3,5-diene) prepolymer is a poly(1,2-di(carboxylic ester)-cyclohexa-3,5-diene).
Claim 5
Dependent Claim
15 words
An alignment layer as claimed in claim 3 wherein the poly(1,2-di(carboxylic ester)-cyclohexa-3,5-diene) is a poly(1,2-diacetoxy-cyclohexa-3,5-diene).
Claim 6
Dependent Claim
21 words
An alignment layer as claimed in claim 3 or claim 4 having a thickness of from 100 Å to 10000 Å.
Claim 7
Dependent Claim
15 words
An alignment layer as claimed in claim 1 wherein the poly(1,2-disubstituted-cyclohexa-3,5-diene) prepolymer is a poly(1,2-di(hydrocarbylcarbonate)-cyclohexa-3,5-diene).
Claim 8
Dependent Claim
14 words
An alignment layer as claimed in claim 6 wherein the poly(1,2-di(hydrocarbylcarbonate)-cyclohexa-3,5-diene) is a poly(1,2-dimethylcarbonate-cyclohexa-3,5-diene).
Claim 9
Dependent Claim
21 words
An alignment layer as claimed in claim 6 or claim 7 having a thickness of from 50 Å to 600 Å.
Claim 10
Dependent Claim
18 words
An alignment layer as claimed in claim 1 having a sodium ion concentration of less than 1000 ppm.
Claim 11
Dependent Claim
18 words
An alignment layer as claimed in claim 9 having a sodium ion concentration of less than 500 ppm.
Claim 12
Dependent Claim
22 words
A method of preparing an alignment layer as claimed in claim 1 which comprises forming the said alignment layer upon a substrate.
Claim 13
Dependent Claim
53 words
A method as claimed in claim 11 which comprises the steps of: (a) depositing a layer of a poly(1,2-disubstituted-cyclohexa-3,5-diene) onto a substrate; (b) subjecting the poly(1,2-disubstituted-cyclohexa-3,5-diene) layer from (a) to a heat treatment to aromatise the 1,2-disubstituted-cyclohex-4-enylene rings to phenylene rings; and (c) fabricating the layer from (b) to form the alignment layer.
Claim 14
Dependent Claim
50 words
A method as claimed in claim 12 wherein the heat treatment is carried out in an inert atmosphere and involves raising the temperature of the poly(1,2-disubstituted-cyclohexa-3,5-diene) polymer layer to a temperature above the glass transition temperature of the polymer and maintaining this temperature for a time sufficient to effect aromatisation.
Claim 15
Dependent Claim
47 words
A method as claimed in claim 12 or claim 13 wherein the heat treatment is carried out in an inert atmosphere and involves raising the temperature to a temperature of between 200° C. and 500° C. and maintaining this temperature for a time sufficient to effect aromatisation.
Claim 16
Independent Claim
38 words
A method as claimed in any one of claims 12 to 14 wherein the deposition of the poly(1,2-disubstituted-cyclohexa-3,5-diene) is at a temperature of from 20° C. to 35° C. and a relative humidity of from 30% to 50%.
Claim 17
Independent Claim
19 words
A method as claimed in any one of claims 12 to 15 wherein the poly(1,2-disubstituted-cyclohexa-3,5-diene) is a poly(1,2-di(carboxylic ester)-cyclohexa-3,5-diene).
Claim 18
Dependent Claim
14 words
A method as claimed in claim 16 wherein the poly(1,2-di(carboxylic ester)-cyclohexa-3,5-diene) is a poly(1,2-diacetoxy-cyclohexa-3,5-diene).
Claim 19
Independent Claim
18 words
A method as claimed in any one of claims 12 to 15 wherein the poly(1,2-disubstituted-cyclohexa-3,5-diene) is a poly(1,2-di(hydrocarbylcarbonate)-cyclohexa-3,5-diene).
Claim 20
Dependent Claim
14 words
A method as claimed in claim 18 wherein the poly(1,2-di(hydrocarbylcarbonate)-cyclohexa-3,5-diene) is a poly(1,2-dimethylcarbonate-cyclohexa-3,5 diene).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |