US4774028A
Expired / Lapsed
US
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Liquid crystalline organosilicon compounds
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1985-05-23
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Granted: 1988-09-27
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Expires: 2005-05-23
Abstract
Abstract Non-crosslinked, branched liquid crystalline organosilicon compounds exhibit the general formula (R.sub.3 SiO.sub.1/2).sub.w (R.sub.2 SiO).sub.x (RSiO.sub.3/2).sub.y (SiO 4/2 ) z where at least one R represents a mesogenic (liquid crystal forming) group, the remaning R represent monovalent hydrocarbon or halohydrocarbon radicals, w represents an integer having a value of at least 1, x, y, and z individually represent an integer including zero, the sum of x and y is at least 1 and the sum of w, x, y, and z is from 4 to 50, inclusive.
Inventors
- 👤 Takeshi Imai
- 👤 Naoyuki Koide
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:49
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/40; C09K19/406; C09K19/408; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C08; C08G; C08G77/00; C08G77/04; C08G77/38
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
121 words
A non-crosslinked liquid crystalline organosilicon compound of the general formula (R.sub.3 SiO.sub.1/2).sub.w (R.sub.2 SiO).sub.x (RSiO.sub.3/2).sub.y (SiO.sub.4/2).sub.z where at least one R present on at least one of the R 3 SiO 178 units represents a mesogenic group that exhibits a nematic or cholesteric phase and is bonded to silicon by a carbon atom of an alkylene or oxyalkylene radical and the remaining R are individually selected from the group consisting of methyl, phenyl and 3,3,3-trifluoropropyl radicals, w represents an integer having a value of at least 1, x, y and z are individually integers including 0, the sum of y and z is at least 1 and the sum of w, x, y and z is from 4 to 50, inclusive.
Claim 2
Dependent Claim
121 words
A non-crosslinked liquid crystalline organosilicon compound of the general formula (R.sub.3 SiO.sub.1/2).sub.w (R.sub.2 SiO).sub.x (RSiO.sub.3/2).sub.y (SiO.sub.4/2).sub.z where at least one R present on at least one of the R 3 SiO 178 units represents a mesogenic group that exhibits a nematic or cholesteric phase and is bonded to silicon by a carbon atom of an alkylene or oxyalkylene radical and the remaining R are individually selected from the group consisting of methyl, phenyl and 3,3,3-trifluoropropyl radicals, w represents an integer having a value of at least 1, x, y and z are individually integers including 0, the sum of y and z is at least 1 and the sum of w, x, y and z is from 4 to 50, inclusive.
Claim 3
Dependent Claim
19 words
The organosilicon compound of claim 1 where the compound exhibits a formula selected from the group consisting of ##STR19##
Claim 4
Dependent Claim
68 words
An organosilicon compound according to claim 1 exhibiting a general formula ##STR20## where each R' is individually selected from the group consisting of methyl, phenyl and 3,3,3,-trifluoropropyl radicals, R" represents said mesogenic group and is bonded to silicon by means of a carbon atom that is part of an alkylene or alkenyloxy radical, a is 0 or 1 and b represents an integer from 0 to 10, inclusive.
Claim 5
Dependent Claim
31 words
An organosilicon compound according to claim 3 where said compound exhibits the formula ##STR21## R' is methyl and the carbon atom bonding R" to silicon is part of an alkyleneoxy radical.
References Cited (Backward Citations)
JPS5424831A
Cited
US4358391A
Cited
US4316041A
Cited
US4469408A
Cited
DE3031126A1
Cited
US4410570A
Cited
US4388453A
Cited
US4657694A
Cited
US4494482A
Cited
EP0121876A1
Cited
US4678283A
Cited
GB2146787A
Cited
US4702558A
Cited
US4713196A
Cited
US4730904A
Cited
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