US5227115A
Expired / Lapsed
US
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Process for aligning liquid-crystalline polymers
Assignee: Hoechst AG
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Filing: 1991-03-05
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Granted: 1993-07-13
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Expires: 2011-03-05
Abstract
Abstract A process for aligning a layer of a liquid-crystalline, polymeric material in which a gas or liquid stream is passed over the liquid-crystalline, polymeric material, preferably for aligning main-chain polymers which have a nematic phase by passing a hot stream of air onto the material. Electrooptical displays which contain an alignment layer of this type have high contrast. The alignment layers have advantages over conventional rubbed alignment layers since, for example, no electrostatic charging takes place.
Inventors
- 👤 Peter Harnischfeger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:28
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; B; B29; B29C; B29C55/00; B29C71/00; B29C71/0072; G02F1/133365; B29K; B29K2067/00; B29K2105/00; B29K2105/0079; G02F1/133765; Y; Y10; Y10S; Y10S428/00; Y10S428/91
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
45 words
A process for aligning a layer of a liquid-crystalline, polymeric material, which comprises passing a laminar gas stream, having a temperature in the range of the nematic phase of the liquid-crystalline polymeric material, over the liquid-crystalline, polymeric material to achieve said aligning of said layer.
Claim 2
Dependent Claim
45 words
A process for aligning a layer of a liquid-crystalline, polymeric material, which comprises passing a laminar gas stream, having a temperature in the range of the nematic phase of the liquid-crystalline polymeric material, over the liquid-crystalline, polymeric material to achieve said aligning of said layer.
Claim 3
Dependent Claim
18 words
The process as claimed in claim 1, wherein the liquid-crystalline, polymeric material used is a thermotropic main-chain polymer.
Claim 4
Dependent Claim
32 words
The process as claimed in claim 1, wherein the liquid-crystalline, polymeric material used is a thermotropic main-chain polymer based on p-hydroxybenzoic acid, isophthalic acid and hydroquinone which has a nematic liquid-crystal phase.
Claim 5
Dependent Claim
19 words
The process as claimed in claim 1, wherein a stream of air is passed over the liquid-crystalline, polymeric material.
Claim 6
Dependent Claim
26 words
The process as claimed in claim 1, wherein the alignment is effected by a gas stream passed over the polymeric layer for at least 2 minutes.
Claim 7
Dependent Claim
28 words
The process as claimed in claim 4, wherein the air stream is passed onto the polymeric material at an angle of incidence (α) of from 0.5° to 10°.
Claim 8
Dependent Claim
28 words
The process as claimed in claim 4, wherein the air stream is passed onto the polymeric material at an angle of incidence (α) of from 1° to 5°.
References Cited (Backward Citations)
US3953626A
Cited
US4139586A
Cited
JPS538658A
Cited
US4925161B1
Cited
US4925161A
Cited
US4636338A
Cited
GB2194792A
Cited
EP0297554A2
Cited
US4952661A
Cited
EP0300752A2
Cited
EP0310081A2
Cited
EP0322703A2
Cited
US5073219A
Cited
US4954600A
Cited
EP0348873A2
Cited
EP0402103A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |