US4865762A
Expired / Lapsed
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Polymers which form liquid-crystalline phases
Assignee: BASF SE
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Filing: 1987-05-12
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Granted: 1989-09-12
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Expires: 2007-05-12
Abstract
Abstract Polymers contain, as mesogenic groups, groups which produce a discotic phase, and furthermore can contain pleochroic dyes. The novel polymers possess novel properties, and combinations of properties, which the conventional polymers which form liquid-crystalline phases do not possess. The polymers can be used in electro-optical displays, in storage elements, as electrically or photo-electrically conductive polymers and as strain sensors.
Inventors
- 👤 Willi Kreuder
- 👤 Peter Neumann
- 👤 Karl-Heinz Etzbach
- 👤 Hans-Josef Sterzel
- 👤 Helmut Ringsdorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:05
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/38; C09; C09B; C09B47/00; C09B47/04; C09B47/045; C09B67/00; C09B67/0032; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/32; C09K19/38; C09K19/3804; C09K19/3809; C09K19/3833; C09K19/40; C09K19/406; C09K19/408; C09K2019/328
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A polymer which forms liquid-crystalline phases, wherein the polymer is a polyorganohydrogenosiloxane, with a group which forms a discotic phase and is of the formula ##STR26## being bonded via a radical R to a silicon atom of the siloxane chain where one radical R is a radical of the formula --Y'--Z'--V--Z' and the remaining radicals R are each a radical of the formula --Y'--Z'--A, Y' is a chemical bond, ##STR27## or --CH 2 , Z' is a chemical bond, --O--, --S--, --SO 2 --, --NH--, ##STR28## V is C 4 -C 25 -alkylene, and A is C 4 -C 12 -alkyl.
Claim 2
Dependent Claim
101 words
A polymer which forms liquid-crystalline phases, wherein the polymer is a polyorganohydrogenosiloxane, with a group which forms a discotic phase and is of the formula ##STR26## being bonded via a radical R to a silicon atom of the siloxane chain where one radical R is a radical of the formula --Y'--Z'--V--Z' and the remaining radicals R are each a radical of the formula --Y'--Z'--A, Y' is a chemical bond, ##STR27## or --CH 2 , Z' is a chemical bond, --O--, --S--, --SO 2 --, --NH--, ##STR28## V is C 4 -C 25 -alkylene, and A is C 4 -C 12 -alkyl.
References Cited (Backward Citations)
US4293435A
Cited
US4333709A
Cited
EP0047198A2
Cited
US4430650A
Cited
EP0048106A1
Cited
US4388453A
Cited
US4657694A
Cited
US4617371A
Cited
FR2544731A1
Cited
US4578210A
Cited
US4734522A
Cited
DE3334056A1
Cited
US4702562A
Cited
US4702945A
Cited
US4713196A
Cited
EP0172450A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |