EP0260786A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Liquid crystal polymers
Assignee: The General Electric Company PLC
•
Filing: 1987-06-24
•
Granted: —
•
Expires: 2007-06-24
Abstract
Abstract Liquid crystal polymers of general formula wherein the ratio b : a is less than 3 and greater than 0, X is a mesogenic group of formula where A and B are cyclic groups, preferably phenyl, which may carry lateral substituents, preferably methyl, R may be F, CF 3 , CN, R i , OR 1 or COOR 1 where R 1 is alkyl, Y is COO 1 OOC, CH 2 CH 2 , c is 0 or 1 . A preferred group X is The polymers may be used for optical information storage either alone or in mixture with other liquid crystals for example with smectic materials of formula where R" is alkyl or alkoxy and r is 0 or 1.
Inventors
- 👤 George William Gray
- 👤 David Lacey
- 👤 Gary Nestor
- 👤 Ciaran Bernard Mcardle
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 07:42
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/40; C09K19/406; C09K19/408
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
144 words
A liquid crystal polymer having a general Formula I wherein X is mesogenic group having a general structure wherein may carry lateral methyl, fluoro or chloro substituents, and are selected from phenyl, trans-cyclohexyl, pyridyl, pyri midyl, dioxanyl and bicyclo-(2,2,2)-octyl; wherein Y is COO, OOC or CH 2 CH 2 , C is 0 or 1; wherein n is an integer between 4 and 9 inclusive; wherein R is F, CF 3 , CN, R 1 , OR 1 or COOR' where R' is alkyl, and ( L ) indicates that a lateral methyl or fluoro substituent may be present; in cases other than when R is CN and Y is COO and n = 5 and C = 1, L = CH 3 : wherein the ratio b:a is less than 3 and greater than 0; the polymer being radom or substantially random polymer.
Claim 2
Dependent Claim
144 words
A liquid crystal polymer having a general Formula I wherein X is mesogenic group having a general structure wherein may carry lateral methyl, fluoro or chloro substituents, and are selected from phenyl, trans-cyclohexyl, pyridyl, pyri midyl, dioxanyl and bicyclo-(2,2,2)-octyl; wherein Y is COO, OOC or CH 2 CH 2 , C is 0 or 1; wherein n is an integer between 4 and 9 inclusive; wherein R is F, CF 3 , CN, R 1 , OR 1 or COOR' where R' is alkyl, and ( L ) indicates that a lateral methyl or fluoro substituent may be present; in cases other than when R is CN and Y is COO and n = 5 and C = 1, L = CH 3 : wherein the ratio b:a is less than 3 and greater than 0; the polymer being radom or substantially random polymer.
Claim 3
Dependent Claim
17 words
A polymer according to claim 1 characterised in that X is selected from structures (Xa) to (Xi):
Claim 4
Dependent Claim
14 words
A polymer to claim 2 characterised in that b:a is between 1.4:1 and 1:1.4.
Claim 5
Dependent Claim
25 words
A polymer according to claim 2 characterised in that the average degree of polymerisation ( DP ) is in the range 10 to 100 inclusive.
Claim 6
Dependent Claim
17 words
A polymer according to claim 2 characterised in that the polydispersity Z is between 1 and 20.
Claim 7
Dependent Claim
47 words
A liquid crystal material being a mixture of at least two compounds at least one of which is a polymer as claimed in claim 1, and at least one of which is a liquid crystal material having a molecular mass less than 500 ("LMM liquid crystal material").
Claim 8
Dependent Claim
30 words
A material according to claim 6 characterised in that the material is capable of being used for optical storage and that the LMM liquid crystal material shows a smectic phase.
Claim 9
Dependent Claim
39 words
A material according to claim 7 characterised in that the LMM liquid crystal material contains at least one compound of formula where m is 0 or 1 and R" is n-alkyl or n-alkoxy containing 8 to 12 carbon atoms.
Claim 10
Dependent Claim
16 words
A material according to claim 8 characterised in that the LMM liquid crystal material contains and
Claim 11
Dependent Claim
30 words
A material according to any one of claims 6 to 9 characterised in that the polymer has X selected from (Xa) to CXg) and b:a is between 1.4:1 and 1:1.4.
Claim 12
Dependent Claim
14 words
A material according to claim 10 characterised in that X has a structure (Xb).
Claim 13
Dependent Claim
16 words
A material according to claim 10 characterised in that the material also contains a pleochroic dye.
Claim 14
Dependent Claim
17 words
A material according to claim 12 characterised in that the pleochroic dye is a suitable anthroquinone dye.
Claim 15
Dependent Claim
27 words
An electro-optic information storage device, characterised in that it uses as its optical storage medium a polymer as claimed in any one of claims 1 to 5.
Claim 16
Dependent Claim
27 words
An electro-optic information storage device, characterised in that is uses as its optical storage medium a material as claimed in any one of claims 6 to 9.
Claim 17
Dependent Claim
22 words
An electro-optic information storage device characterised in that it uses as its optical storage medium a material as claimed in claim 10.
Claim 18
Dependent Claim
22 words
An electro-optic information storage device characterised in that it uses as its optical storage medium a material as claimed in claim 11.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.