US4627933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystalline phases containing alkylene-type bridges
Assignee: UK Secretary of State for Defence
•
Filing: 1983-07-07
•
Granted: 1986-12-09
•
Expires: 2003-07-07
Abstract
Abstract Compounds of the formula R.sup.1 --Q.sup.1 --(CH.sub.2).sub.m --(COO).sub.n --(CH.sub.2).sub.p --Q 2 --R 2 wherein R 1 and R 2 are each independently alkyl or alkoxy each of 1-12 C atoms, F, Cl, Br, CN or --Q 3 --R 3 , or one of R 1 and R 2 can also be H; Q 1 , Q 2 and Q 3 are each independently 1,4-phenylene, 1,4-cyclohexylene, 1,4-bicyclo(2,2,2)-octylene or 1,3-dioxane-2,5-diyl, each of which is unsubstituted or substituted by 1-4 fluorine, chlorine or bromine atoms; R 3 is alkyl or alkoxy each of 1-8 C atoms, H, F, Cl, Br or CN; m is 1, 2, 3, 4, 5 or 6; n is 0 or 1; and p is 0, 1, 2, 3, 4 or 5; the sum of (m+p) being 2, 4 or 6 and the sum of (m+n+p) being at least 3; but with the proviso that Q 3 is unsubstituted 1,4-phenylene or 1,4-phenylene substituted by a fluorine, chlorine or bromine atom, only when n=1 or (m+p)=6 or at least one of R 1 or R 3 is F, Cl or Br or none of R 1 to R 3 is CN or two of the radicals R 1 to R 3 are CN, are valuable liquid crystalline components.
Inventors
- 👤 Rudolf Eidenschink
- 👤 Joachim Krause
- 👤 Beatrice M. Andrews
- 👤 George W. Gray
- 👤 Neil Carr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:17
CPC Classifications
C; C07; C07C; C07C255/00; C07C13/00; C07C13/28; C07C25/00; C07C25/18; C07C43/00; C07C43/02; C07C43/20; C07C43/205; C07C5/00; C07C5/02; C07C5/03; C07D; C07D317/00; C07D317/08; C07D317/10; C07D317/14; C07D317/30; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2014; C09K19/30; C09K19/3001; C09K19/32; C09K19/321; C09K19/34; C09K19/3402; C09K2019/3422
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
200 words
A liquid-crystal dielectric useful for electro-optical display elements and comprising at least two liquid-crystal components, wherein at least one of the components is a compound of the formula R.sup.1 --Q.sup.1 --(CH.sub.2).sub.4 --Q.sup.2 --R.sup.2, (a) R.sup.1 --Q.sup.1 --(CH.sub.2).sub.6 --Q.sup.2 --R.sup.2, (b) R.sup.1 --Q.sup.1 --CH.sub.2 --COO--CH.sub.2 --Q.sup.2 --R.sup.2, or (c) R.sup.3 --Cy--Phe--CH.sub.2 CH.sub.2 --COO--Phe--R.sup.2 (d) wherein R 1 and R 2 are each independently alkyl or alkoxy each of 1-12 C atoms, F, Cl, Br, CN or --Q 3 --R 3 , or one of R 1 and R 2 can also be H; Q 1 , Q 2 and Q 3 are each independently 1,4-phenylene (Phe), or 1,4-cyclohexylene (Cy), each of which is unsubstituted or substituted by 1-4 fluorine, chlorine or bromine atoms; R 3 is alkyl or alkoxy each of 1-8 C atoms, H, F, Cl, Br or CN; but with the proviso that in formula (a), Q 3 is unsubstituted 1,4-phenylene or 1,4-phenylene substituted by a fluorine, chlorine or bromine atom, only when at least one of R 1 to R 3 is F, Cl or Br or none of R 1 to R 3 is CN or two of the radicals R 1 to R 3 are CN.
Claim 2
Dependent Claim
200 words
A liquid-crystal dielectric useful for electro-optical display elements and comprising at least two liquid-crystal components, wherein at least one of the components is a compound of the formula R.sup.1 --Q.sup.1 --(CH.sub.2).sub.4 --Q.sup.2 --R.sup.2, (a) R.sup.1 --Q.sup.1 --(CH.sub.2).sub.6 --Q.sup.2 --R.sup.2, (b) R.sup.1 --Q.sup.1 --CH.sub.2 --COO--CH.sub.2 --Q.sup.2 --R.sup.2, or (c) R.sup.3 --Cy--Phe--CH.sub.2 CH.sub.2 --COO--Phe--R.sup.2 (d) wherein R 1 and R 2 are each independently alkyl or alkoxy each of 1-12 C atoms, F, Cl, Br, CN or --Q 3 --R 3 , or one of R 1 and R 2 can also be H; Q 1 , Q 2 and Q 3 are each independently 1,4-phenylene (Phe), or 1,4-cyclohexylene (Cy), each of which is unsubstituted or substituted by 1-4 fluorine, chlorine or bromine atoms; R 3 is alkyl or alkoxy each of 1-8 C atoms, H, F, Cl, Br or CN; but with the proviso that in formula (a), Q 3 is unsubstituted 1,4-phenylene or 1,4-phenylene substituted by a fluorine, chlorine or bromine atom, only when at least one of R 1 to R 3 is F, Cl or Br or none of R 1 to R 3 is CN or two of the radicals R 1 to R 3 are CN.
Claim 3
Dependent Claim
17 words
A dielectric of claim 1 wherein in said compound all alkyl and alkoxy groups are straight chained.
Claim 4
Dependent Claim
20 words
A dielectric of claim 1 wherein in said compound R 1 and R 2 are independently alkyl, alkoxy or CN.
Claim 5
Dependent Claim
10 words
A dielectric of claim 1 comprising 2-15 liquid crystal components.
Claim 6
Dependent Claim
20 words
In an electro-optical display element comprising a liquid crystal dielectric, the improvement wherein the dielectric is that of claim 1.
Claim 7
Dependent Claim
89 words
A dielectric of claim 1 including at least one compound of the formula Alkoxy--Phe--(CH 2 ) q --Phe--Alkoxy NC--Phe--(CH 2 ) q --Phe--CN Alkyl--Phe--(CH 2 ) q --Phe--CN Alkoxy--Phe--(CH 2 ) q --Phe--CN Alkyl--Cy--Phe--(CH 2 ) q --Phe--Cy--Alkyl R 1 --Phe--CH 2 --COO--CH 2 --Q 2 --R 2 , or R 4 --Cy--Phe--CH 2 --COO--CH 2 --Phe--R 4 wherein q is 4 or 6, the two wing groups can be the same or different and R 4 is one of the groups defined for R 3 in claim 1.
Claim 8
Dependent Claim
16 words
A dielectric of claim 1, wherein at least one of said components is of formula (a).
Claim 9
Dependent Claim
16 words
A dielectric of claim 1, wherein at least one of said components is of formula (b).
Claim 10
Dependent Claim
16 words
A dielectric of claim 1, wherein at least one of said components is of formula (c).
Claim 11
Dependent Claim
16 words
A dielectric of claim 1, wherein at least one of said components is of formula (d).
Claim 12
Dependent Claim
13 words
A dielectric of claim 6, wherein at most one wing group is H.
Claim 13
Dependent Claim
10 words
A dielectric of claim 1, wherein each Cy is unsubstituted.
Claim 14
Dependent Claim
41 words
A dielectric of claim 1, wherein when Q 1 , Q 2 and Q 3 are Cy, R 1 , R 2 and R 3 attached directly thereto are alkyl and wherein R 3 is alkyl when attached directly to Cy.
Claim 15
Dependent Claim
41 words
A dielectric of claim 12, wherein when Q 1 , Q 2 and Q 3 are Cy, R 1 , R 2 and R 3 attached directly thereto are alkyl and wherein R 3 is alkyl when attached directly to Cy.
References Cited (Backward Citations)
US3720690A
Cited
US3787512A
Cited
US3926834A
Cited
US3855166A
Cited
US3927066A
Cited
US4065489A
Cited
US4035056A
Cited
DE2617593A1
Cited
US4150137A
Cited
US4113647A
Cited
US4335251A
Cited
US4229315A
Cited
US4261651A
Cited
US4357078A
Cited
US4400293A
Cited
US4334079A
Cited
US4313878A
Cited
US4419263A
Cited
US4431853A
Cited
EP0056501A2
Cited
US4439015A
Cited
GB2093057A
Cited
US4455443A
Cited
DE3237367A1
Cited
US4393258A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-08 | 1990-06-09 | 1990-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-08 | 1994-06-09 | 1994-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-08 | 1998-06-09 | 1998-12-09 | $7700.00 | Window Closed / Lapsed |