EP0354753A2
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EP
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Liquid crystal materials
Assignee: The General Electric Company PLC
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Filing: 1989-08-07
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Granted: —
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Expires: 2009-08-07
Abstract
Abstract Liquid crystal polymers, which may be useful for optical information storage, either alone or in mixture with other liquid crystals, are of the general formula wherein the mesogenic grouping M has a general structure wherein the rings P and Q are selected from phenyl, trans-cyclohexyl, pyridyl, pyrimidinyl, dioxanyl, and bicyclo (2.2.2) octyl. The rings P and/or Q may carry lateral substituents, preferably Me or F. The general structure of Formula (I) may represent a homopolymer or a copolymer.
Inventors
- 👤 Ciran Bernard Mcardle
- 👤 Gary Nestor
- 👤 George William "Glenwood" Gray
- 👤 David Lacey
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 10:55
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/40; C09K19/406; C09K19/408
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
35 words
A liquid crystal polymer having the general formula: wherein the mesogenic grouping M has a general structure wherein the rings P and Q are selected from phenyl, trans-cyclohexyl, pyridyl, pyrimidinyl, dioxanyl, and bicyclo (2.2.2) octyl.
Claim 2
Dependent Claim
35 words
A liquid crystal polymer having the general formula: wherein the mesogenic grouping M has a general structure wherein the rings P and Q are selected from phenyl, trans-cyclohexyl, pyridyl, pyrimidinyl, dioxanyl, and bicyclo (2.2.2) octyl.
Claim 3
Dependent Claim
25 words
A liquid crystal polymer as claimed in Claim 1, wherein the ring P and/or the ring Q carries lateral substituents such as Me or F.
Claim 4
Dependent Claim
17 words
A liquid crystal polymer as claimed in Claim 1, wherein the structure of formula I represents homopolymer.
Claim 5
Dependent Claim
47 words
A liquid crystal polymer as claimed in Claim 3, wherein b=o and R=Me; wherein Y is R, OR₁, Hal, CF₃, CO₂R₁ or CN; and wherein x and z are selected independently from H and F such that one at least of x, y and z contains fluorine.
Claim 6
Dependent Claim
35 words
A liquid crystal polymer as claimed in Claim 3, wherein b=o and R=CH₂Me; wherein Y is R₁, OR₁,Hal, CF₃, CO₂R₁ or CN; and wherein x and z are selected independently from H, Me and F.
Claim 7
Dependent Claim
18 words
A liquid crystal polymer as claimed in Claim 1, wherein the structure of formula I represents a copolymer.
Claim 8
Dependent Claim
78 words
A liquid crystal polymer as claimed in Claim 6, wherein b/a < 3 and > o, R¹ = (CH₂)₃CN, R = Me, Y is R₁, OR₁, Hal, CF₃, CO₂R₁ or CN, and x and z are selected independently from H₁, Me and Hal; wherein n is an integer from 3 to 11, A is COO, OOC or CH₂.CH₂, m is o or 1; and wherein R₁ is alkyl, open chain or branched containing 1 to 12 carbon atoms.
Claim 9
Dependent Claim
22 words
A liquid crystal polymer as claimed in Claim 7, wherein the average degree of polymerisation is in the range 10 to 120.
Claim 10
Dependent Claim
24 words
A liquid crystal polymer as claimed in Claim 1, wherein R=Me and the group M is selected from structures (Ma) to (Md) as follows:
Claim 11
Dependent Claim
19 words
A liquid crystal polymer as claimed in Claim 9, wherein the average degree of polymerisation is 35 to 50.
Claim 12
Dependent Claim
26 words
A liquid crystal polymer as claimed in Claim 1, wherein R = CH₂Me and the group M is selected from structures (Me) to (Mh) as follows:
Claim 13
Dependent Claim
19 words
A liquid crystal polymer as claimed in Claim 11, wherein the average degree of polymerisation is 10 to 40.
Claim 14
Dependent Claim
26 words
A liquid crystal polymer as claimed in Claim 1, wherein R = (CH₂)₃CN and the group M is selected from structures (Mi) to (Ml) as follows:
Claim 15
Dependent Claim
19 words
A liquid crystal polymer as claimed in Claim 13, wherein the average degree of polymerisation is 10 to 40.
Claim 16
Dependent Claim
18 words
A liquid crystal polymer as claimed in Claim 14, wherein the ratio b/a is between 1.4:1 and 1:1.4.
Claim 17
Dependent Claim
19 words
A liquid crystal polymer as claimed in Claim 1, wherein the polydispersity γ lies between 1 and about 20.
Claim 18
Dependent Claim
16 words
A liquid crystal polymer as claimed in Claim 16, wherein polydispersity lies between 1.9 and 3.5.
Claim 19
Dependent Claim
26 words
A liquid crystal material comprising a mixture of a liquid crystal polymer as claimed in Claim 1 and a low molar mass (LMM) liquid crystal material.
Claim 20
Dependent Claim
19 words
A liquid crystal material as claimed in Claim 18, wherein the LMM liquid crystal material exhibits a smectic phase.
Claim 21
Dependent Claim
20 words
A liquid crystal material as claimed in Claim 19, wherein the LMM liquid crystal material of formula II, as follows:
Claim 22
Dependent Claim
16 words
A liquid crystal material as claimed in Claim 20, wherein the LMM liquid crystal material contains
Claim 23
Dependent Claim
17 words
A liquid crystal material as claimed in any one of Claims 18-21, further comprising a pleochroic dye.
Claim 24
Dependent Claim
16 words
A liquid crystal material as claimed in Claim 22, wherein the dye is an anthraquinone dye.
Claim 25
Independent Claim
33 words
A method of forming a liquid crystal polymer as claimed in any preceding claim, comprising reacting a suitable poly-(hydrogen methyl/dimethyl) siloxane and a mesogenic terminal alkene in the presence of a suitable catalyst.
Claim 26
Dependent Claim
13 words
A method as claimed in Claim 24, wherein the reaction is represented by
References Cited (Backward Citations)
No citation records indexed.
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