Compounds and process for controlling cone tilt angle in mixtures of smectic liquid crystal compounds
First Claim
1. A process for controlling the cone tilt angle of a tilted smectic liquid crystal composition comprising the step of combining (a) at least one liquid crystal composition comprising at least one smectic or latent smectic liquid crystal compound comprising (i) an aliphatic fluorocarbon terminal portion comprising a terminal fluoroalkyl or fluoroether group and an alkylene group having at least two carbon atoms and containing at least one catenary ether oxygen atom, (ii) an aliphatic hydrocarbon terminal portion, and (iii) a central core connecting said terminal portions, wherein said alkylene group of said aliphatic fluorocarbon terminal portion is directly linked to said central core by a moiety selected from the group consisting of a covalent bond, --CH═
- CH--, and --C.tbd.C--; and
(b) at least one liquid crystal composition comprising at least one smectic or latent smectic liquid crystal compound;
with the provisos that at least one of said compositions (a) and (b) comprises at least one chiral liquid crystal compound and that said combining of compositions (a) and (b) provides an optically active, tilted chiral smectic liquid crystal composition.
2 Assignments
0 Petitions
Accused Products
Abstract
A process for controlling the cone tilt angle of a tilted smectic liquid crystal composition comprises the step of combining (a) at least one liquid crystal composition comprising at least one smectic or latent smectic liquid crystal compound comprising (i) an aliphatic fluorocarbon terminal portion comprising a terminal fluoroalkyl or fluoroether group and an alkylene group having at least two carbon atoms and containing at least one catenary ether oxygen atom, (ii) an aliphatic hydrocarbon terminal portion, and (iii) a central core connecting the terminal portions, wherein the alkylene group of the aliphatic fluorocarbon terminal portion is directly linked to the central core by a moiety selected from the group consisting of a covalent bond, --CH═CH--, and --C.tbd.C--; and (b) at least one liquid crystal composition comprising at least one smectic or latent smectic liquid crystal compound; with the provisos that at least one of the compositions (a) and (b) comprises at least one chiral liquid crystal compound and that the combining of compositions (a) and (b) provides an optically active, tilted chiral smectic liquid crystal composition. The process enables control of cone tilt angle and thereby control of the brightness characteristics of liquid crystal display devices.
-
Citations
34 Claims
-
1. A process for controlling the cone tilt angle of a tilted smectic liquid crystal composition comprising the step of combining (a) at least one liquid crystal composition comprising at least one smectic or latent smectic liquid crystal compound comprising (i) an aliphatic fluorocarbon terminal portion comprising a terminal fluoroalkyl or fluoroether group and an alkylene group having at least two carbon atoms and containing at least one catenary ether oxygen atom, (ii) an aliphatic hydrocarbon terminal portion, and (iii) a central core connecting said terminal portions, wherein said alkylene group of said aliphatic fluorocarbon terminal portion is directly linked to said central core by a moiety selected from the group consisting of a covalent bond, --CH═
- CH--, and --C.tbd.C--; and
(b) at least one liquid crystal composition comprising at least one smectic or latent smectic liquid crystal compound;
with the provisos that at least one of said compositions (a) and (b) comprises at least one chiral liquid crystal compound and that said combining of compositions (a) and (b) provides an optically active, tilted chiral smectic liquid crystal composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 23)
- CH--, and --C.tbd.C--; and
-
18. Fluorine-containing liquid crystal compounds represented by the general formula I:
- ##STR77## where M, N, and P are each independently selected from the group consisting of ##STR78## a, b, and c are each independently zero or an integer of from 1 to 3, with the proviso that the sum of a +b +c be at least 1;
each A and B are non-directionally and independently selected from the group consisting of a covalent bond,
space="preserve" listing-type="equation">--C(═
O)--O--, --C(═
O)--S--, --C(═
O)--Se--,
space="preserve" listing-type="equation">--C(═
O)--Te--, --(CH.sub.2 CH.sub.2).sub.k --where k is 1 to 4,
space="preserve" listing-type="equation">--CH═
CH--, --C.tbd.--C--, --CH═
N--, --CH.sub.2 --O--, --C(═
O)--, and --O--;each X, Y, and Z are independently selected from the group consisting of --Cl, --Br, --I, --OH, --OCH3, --CH3 , --CF3, --OCF3, --CN, and --NO2 ; each l, m, and n are independently zero or an integer of 1 to 4; D is a moiety selected from the group consisting of a covalent bond, --CH═
CH--, and --C.tbd.C--;R is selected from the group consisting of
space="preserve" listing-type="equation">--O--((C.sub.q'"'"' H.sub.2q'"'"'-v'"'"' (R'"'"').sub.v'"'"')--O).sub.w --C.sub.q H.sub.2q+1-v --(R'"'"').sub.v '"'"'
space="preserve" listing-type="equation">--((C.sub.q'"'"' H.sub.2q'"'"'-v'"'"' --(R'"'"').sub.v'"'"')--O).sub.w --C.sub.q H.sub.2q+1-v --(R'"'"').sub.v,
space="preserve" listing-type="equation">--C(═
O) --O--C.sub.q H.sub.2q+1-v --(R'"'"').sub.v, --(O═
)C--C.sub.q H.sub.2q+1-v --(R'"'"').sub.v, ##STR79##
space="preserve" listing-type="equation">--CR'"'"'H--(D'"'"').sub.g --CR'"'"'H--C.sub.q H.sub.2q+1-v --(R'"'"').sub.v ,where each R'"'"' is independently selected from the group consisting of --Cl, --F, --CF3 --NO2, --CN, --H, --Cq H2q+1, --O--(O═
)C--Cq H2q+1, --C(═
O)--O--Cq H2q+1, --Br, --OH, and --OCq H2q+1 ;
q'"'"' is independently an integer of 1 to about 20 for each (Cq'"'"' H2q'"'"' --O) ;
q is an integer of 1 to about 20;
w is an integer of 0 to about 10 ;
v is an integer of 0 to about 6;
each v'"'"' is independently an integer of 0 to about 6;
g is an integer of 1 to about 3;
each D'"'"' is independently and non-directionally selected from the group consisting of a covalent bond,
space="preserve" listing-type="equation">--C(═
O)--O--C.sub.r H.sub.2r --, --O--C.sub.r H.sub.2r --, --O--(O═
)C--C.sub.r H.sub.2r --, --C.tbd.C--, --CH═
C--, --C(═
O)--,
space="preserve" listing-type="equation">--O.paren open-st.C.sub.s H.sub.2s O.paren close-st..sub.t C.sub.r H.sub.2r'"'"' --,--C.sub.r H.sub.2r --, .paren open-st.C.sub.s H.sub.2s O.paren close-st..sub.t C.sub.r'"'"' H.sub.2r'"'"' --, --O--, --S--, ##STR80## r and r'"'"' are independently integers of 0 to about 20, s is independently an integer of 1 to about 10 for each (C.sub.s H.sub.2s O), t is an integer of 1 to about 6, and p is an integer of 0 to about 4, with the proviso that the ring containing D'"'"' has from about 3 to about 10 ring atoms;
each W is independently selected from the group consisting of N, CR'"'"', and SiR'"'"';Rh is an alkylene group having at least two carbon atoms and containing at least;
one catenary ether oxygen atom; andRf is fluoroalkyl or fluoroether. - View Dependent Claims (19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31)
- ##STR77## where M, N, and P are each independently selected from the group consisting of ##STR78## a, b, and c are each independently zero or an integer of from 1 to 3, with the proviso that the sum of a +b +c be at least 1;
-
32. A process for controlling the cone tilt angle of a tilted smectic liquid crystal composition comprising the step of combining (a) at least one liquid crystal composition comprising at least one smectic or latent smectic liquid crystal compound comprising (i) an aliphatic fluorocarbon terminal portion represented by the formula --D--Rh --Rf, where Rh contains from 2 to about 14 carbon atoms and is represented by the general formula (Cs H2s O)t Cr'"'"' H2 r'"'"'--, wherein s is independently an integer of 1 to about 10 for each (Cs H2s O), t is an integer of 1 to about 6, and r'"'"' is an integer of 1 to about 10;
- Rf is perfluoroalkyl or perfluoroether and contains from 1 to about 20 carbon atoms; and
D is a moiety selected from the group consisting of a covalent bond, --CH═
CH--, and --C.tbd.C--;
(ii) an aliphatic hydrocarbon terminal portion; and
(iii) a central core connecting said terminal portions; and
(b) at least one liquid crystal composition comprising at least one fluorine-containing, smectic or latent smectic liquid crystal compound;
with the provisos that at least one of said compositions (a) and (b) comprises at least one chiral liquid crystal compound and that said combining of compositions (a) and (b) provides an optically active, Lilted chiral smectic liquid crystal composition. - View Dependent Claims (33, 34)
- Rf is perfluoroalkyl or perfluoroether and contains from 1 to about 20 carbon atoms; and
Specification