EP0256303A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Liquid crystal compounds having fluorine-containing core
Assignee: Polaroid Corp
•
Filing: 1987-07-11
•
Granted: —
•
Expires: 2007-07-11
Abstract
Abstract Liquid crystal compounds exhibiting ferroelectric behavior and favorable spontaneous polarization values are disclosed and have the formula <CHEM> wherein Ar is p-phenylene or p,p min -biphenylene; L is a linking group selected from -CH2-, -O-, <CHEM> n is an integer one or two; each of Z and Z min is alkyl, alkoxy, alkoxyalkyl or an optically active group containing an asymmetric center; at least one of Z and Z min being said optically active group containing an asymmetric center. Compounds exhibiting the chiral smectic C phase are particularly suited to application in a ferroelectric display device.
Inventors
- 👤 William J. Cumming
- 👤 R.A. Gaudiana
- 👤 Cynthia Mcgowan
- 👤 Richard A. Minns
- 👤 Alaric Naiman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 06:32
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
68 words
A smectic liquid crystal compound having the formula wherein Ar is p -phenylene or p,p'-biphenylene; L is a linkinig group selected from -CH -, - 0 -, n is an integer one or two; each of Z and Z is alkyl, alkoxy, alkoxyalkyl or an optically adtive group containing an asymmetric center; at least one of Z and Z' being said optically active group containing an asymmetric center.
Claim 2
Dependent Claim
68 words
A smectic liquid crystal compound having the formula wherein Ar is p -phenylene or p,p'-biphenylene; L is a linkinig group selected from -CH -, - 0 -, n is an integer one or two; each of Z and Z is alkyl, alkoxy, alkoxyalkyl or an optically adtive group containing an asymmetric center; at least one of Z and Z' being said optically active group containing an asymmetric center.
Claim 3
Dependent Claim
16 words
The smectic liquid crystal compound of claim 1 wherein -L- is -O- and n is two.
Claim 4
Dependent Claim
21 words
The smectic liquid crystal compound of claims 1 or 2 wherein Z is n-alkoxy of from 8 to 20 carbon atoms.
Claim 5
Dependent Claim
56 words
The smectic liquid crystal compound of anyone of claims 1-3 wherein Z' is an optically active group having the formula wherein a is zero or an integer from 1 to 8 and each of R 4 and R 5 is alkyl halogen, alkoxy or alkoxyalkyl provided that R 4 and R are different from each other.
Claim 6
Dependent Claim
19 words
The smectic liquid crystal compound of claim 4 wherein a is one, R is mehtyl and R is ethyl.
Claim 7
Dependent Claim
24 words
The smectic liquid crystal compound of anyone of claims 1 to 5 wherein said fluoro substituent is positioned ortho with respect to said Z-moiety.
Claim 8
Dependent Claim
18 words
The smectic liquid crystal compound of anyone of claims 1 to 6 wherein Ar is p-phenylene or p,p'-biphenylene.
Claim 9
Dependent Claim
19 words
The smectic liquid crystal compound of anyone of claims 1 to 7 wherein Z is n-octyloxy, n-decyloxy or n-dodecyloxy.
Claim 10
Dependent Claim
27 words
The smectic liquid crystal compound of anyone of claims 1 to 8 wherein Z is an iptically active group containing an asymmetric center and Z' is alkyl.
Claim 11
Dependent Claim
65 words
The smectic liquid crystal compound of anyone of claims 1 to 9 wherein Z is an optically active group having the formula - OR* wherein R * has the formula 4 wherein a is zero or an integer from 1 to 8 and each of R and 5 R is alkyl, halogen, alkoxy or alkoxyalkyl, provided that R and R are different from each other.
Claim 12
Dependent Claim
23 words
The smectic liquid crystal compound of anyone of claims 1 to 10 wherein a is one, R is methyl and R is ethyl.
Claim 13
Dependent Claim
16 words
The smectic liquid crystal compound of anyone of claims 1 to 9 wherein Z' is n-octyl.
Claim 14
Dependent Claim
18 words
The smectic liquid crystal compound of anyone of claims 1 to 12 wherein -L-is and n is two.
Claim 15
Dependent Claim
19 words
The smectic liquid crystal compound of claim 1 wherein Z is alkyl of from 8 to 20 carbon atoms.
Claim 16
Dependent Claim
75 words
A smectic liquid crystal composition containing as a component a smectic liquid crystal compound of the formula wherein Ar is p-phenylene or p,p'-biphenylene; L is a linkinig group selected from -CH 2 -, -0-, n is an integer one or two; each of Z and Z is alkyl, alkoxy, alkoxyalkyl or an opticallv active group containing an asymmetric center; at least one of Z and Z' being said optically active group containing an asymmetric center.
Claim 17
Dependent Claim
75 words
A smectic liquid crystal composition containing as a component a smectic liquid crystal compound of the formula wherein Ar is p-phenylene or p,p'-biphenylene; L is a linkinig group selected from -CH 2 -, -0-, n is an integer one or two; each of Z and Z is alkyl, alkoxy, alkoxyalkyl or an opticallv active group containing an asymmetric center; at least one of Z and Z' being said optically active group containing an asymmetric center.
Claim 18
Dependent Claim
38 words
The liquid crystal composition of claim 15 wherein Z' is an optically active group having the formula 17. The liquid crystal composition of claims 15 or 16 wherein fluoro substituent is positioned ortho with respect to said Z-moiety.
Claim 19
Dependent Claim
17 words
The liquid crystal composition of anyone of claims 15 to 17 wherein Z- is n-decyloxy or n-dodecyloxy.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.