Liquid crystal compounds having perfluoroether terminal portions
AssigneeMinnesota Mining and Manufacturing Company
InventorsEugene P. Janulis, Gilbert C. Johnson, Marc D. Radcliffe, Patricia M. Savu, Daniel C. Snustad, Terence D. Spawn
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Abstract
Fluorine-containing liquid crystal compounds comprise a fluorocarbon terminal portion having at least one catenary ether oxygen and a hydrocarbon terminal portion, the terminal portions being connected by a central core. The compounds have smectic or latent smectic mesophases.
Claims10
Fluorine-containing intermediate compounds which can be represented by the formula ##STR100## wherein N and P are each independently phenyl, napthyl, or pyrimidinyl;
- b and c are each independently zero or an integer of 1 to 2, with the proviso that the sum of b+c be at least 1;
- B is a covalent bond;
- A" is --OH or --COOH;
- each Y and Z are independently --H, --Cl, --F, --OCH.sub.3, --OH, --CH.sub.3, --CF.sub.3, --OCF.sub.3, --NO.sub.2, --Br, --I, or --CN;
- m and n are zero;
- D is --OCH.sub.2 --;
- and
- R.sub.f is --(C.sub.x F.sub.2x O).sub.z C.sub.y F.sub.2y+1 where x is independently 1 to 10 for each C.sub.x F.sub.2x O group, y is 1 to 10, and z is 1 to 10.
Fluorine-containing intermediate compounds which can be represented by the formula
- A"--B--D--R.sub.f
- wherein
- B is a covalent bond;
- A" is --OH, --OSO.sub.2 CF.sub.3, --OSO.sub.2 C.sub.4 F.sub.9, --OSO.sub.2 C.sub.8 F.sub.17, or --OSO.sub.2 C.sub.6 H.sub.4 CH.sub.3 ;
- D is --C.sub.r H.sub.2r -- where r and r' is 1 to 20, s is independently 1 to 10 for each (C.sub.s H.sub.2s O), and t is 1 to 6;
- and
- R.sub.f is --(C.sub.x F.sub.2x O).sub.z C.sub.y F.sub.2y+1 where x is independently 1 to 10 for each C.sub.x F.sub.2x O group, y is 1 to 10, and z is 1 to 10.
Fluorine-containing liquid crystal compounds represented by the formula ##STR101## where M, N, and P are each independently ##STR102## 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 2;
- each A and B are non-directionally and independently a covalent bond, ##STR103## --(CH.sub.2 CH.sub.2).sub.k -- where k is 1 to 4, --CH.dbd.CH--, --C.tbd.C--, --CH.dbd.N--, --CH.sub.2 --O--, ##STR104## or --O--;
- each X, Y, and Z are independently --H, --Cl, --F, --Br, --I, --OH, --OCH.sub.3, --CH.sub.3, --CF.sub.3, --OCF.sub.3 --CN, or --NO.sub.2 ;
- each l, m, and n are independently zero or an integer of 1 to 4,
- D is a covalent bond, ##STR105## where r and r' are independently 1 to 20, s is independently 1 to 10 for each (C.sub.s H.sub.2s O), t is 1 to 6 and where r and r' are independently 1 to 20, and p is 0 to 4;
- R is ##STR106## where R' is --Cl, --F, --CF.sub.3, --NO.sub.2, --CN, --H, ##STR107## and q and q' are independently 1 to 20, w is 1 to 10 and R can be straight chain or branched;
- and
- R.sub.f is --(CF.sub.2).sub.w,O(C.sub.x F.sub.2x O).sub.z C.sub.y F.sub.2y+1 where w' is an integer of 5 to 16, x is independently an integer of 1 to 10 for each C.sub.x F.sub.2x O, y is an integer of 1 to 10, and z is an integer of 1 to 10.
Dependencies are inferred from the claim text.