US4388453A
Expired / Lapsed
US
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Crosslinked organopolysiloxanes having liquid-crystalline properties
Assignee: Consortium fuer Elektrochemische Industrie GmbH
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Filing: 1982-05-05
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Granted: 1983-06-14
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Expires: 2002-05-05
Abstract
Abstract This invention relates to crosslinked organopolysiloxanes having liquid-crystalline properties in which mesogenic molecules are chemically bonded to the organopolysiloxane lattices. These crosslinked organopolysiloxanes are prepared from silanes or siloxanes containing mesogenic molecules which are capable of being crosslinked by addition or condensation reactions.
Inventors
- 👤 Heino Finkelmann
- 👤 Gunther Rehage
- 👤 Franz-Heinrich Kreuzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:45
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/40; C09K19/406; C09K19/408; C08; C08G; C08G77/00; C08G77/04; C08G77/38; C08L; C08L83/00; C08L83/04; C08G77/12; C08G77/14; C08G77/16; C08G77/18; C08G77/20; C08G77/22; C08G77/26; C08G77/28; C08G77/30; C08G77/70
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
17 words
Three dimensional crosslinked organopolysiloxanes having liquid-crystalline properties which have mesogenic molecules chemically bonded to the organopolysiloxane lattice.
Claim 2
Dependent Claim
17 words
Three dimensional crosslinked organopolysiloxanes having liquid-crystalline properties which have mesogenic molecules chemically bonded to the organopolysiloxane lattice.
Claim 3
Dependent Claim
14 words
The organopolysiloxanes of claim 1, wherein the organopolysiloxanes have nematic or chiral nematic properties.
Claim 4
Dependent Claim
71 words
A process for preparing the crosslinked organopolysiloxanes of claims 1 or 2, wherein an organohydrogenopolysiloxane is reacted with a mixture containing vinyl-substituted mesogenic molecules and an organopolysiloxane having a vinyl group in each terminal unit, in which at least a stoichiometric number of vinyl groups and Si-H groups are present in the reaction mixture, in the presence of a catalyst capable of promoting the addition of Si-H to aliphatic multiple bonds.
Claim 5
Dependent Claim
82 words
The process for preparing the organopolysiloxanes of claims 1 or 2, wherein silanes or mixtures of silanes having the general formula R.sub.n SiR'.sub.4-n wherein R is a mesogenic molecule, R' is a condensable group, and n stands for 0, 1, 2 or 3, are allowed to crosslink in the presence of a condensation catalyst, with the proviso that in at least a portion of these silanes n is at least equal to 1 and in another portion n is 0 or 1.
References Cited (Backward Citations)
US4358391A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |