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US 4,364,838 AGranted
Liquid crystal mixtures
AssigneeHoffmann-La Roche Inc.
InventorsArthur Boller, Alfred Germann, Martin Schadt, Alois Villiger
Life of this patent
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Abstract
Liquid crystalline mixtures comprising trans-phenyldioxane, phenylpyrimidine and phenylbenzoate compounds which are useful in electro-optical apparatuses are disclosed.
Claims37
A liquid crystalline mixture comprising:
- (a) about 10 to about 75 mol percent of at least one trans-phenyl-dioxane of the formula:
- ##STR19## wherein R.sup.1 is straight chain alkyl of 3 to 7 carbon atoms;
- (b) about 5 to about 30 mole percent of at least one phenylpyrimidine of the formula:
- ##STR20## wherein R.sup.1 is as above;
- and (c) about 2 to about 20 mol percent of at least one phenylbenzoate of the formula:
- ##STR21## wherein R.sup.2 is straight chain alkyl of 2 to 7 carbon atoms.
3 more elements
A liquid crystalline mixture comprising:
- (a) about 10 to about 75 mol percent of a trans-phenyldioxane of the formula:
- ##STR28## wherein R.sup.1 is straight chain alkyl of 3 to 7 carbon atoms;
- (b) about 5 to about 30 mol percent of a phenylpyrimidine of the formula:
- ##STR29## wherein R.sup.1 is as above;
- (c) about 2 to about 20 mol percent of a phenylbenzoate of the formula:
- ##STR30## wherein R.sup.2 is straight chain alkyl of 2 to 7 carbon atoms;
- (d) about 0 to about 15 mol percent of a compound of the formula:
- ##STR31## wherein at least one of rings A and B is trans-1,4-disubstituted cyclohexane and the other is trans-1,4-disubstituted cyclohexane or aromatic and R is straight chain alkyl of 1 to 10 carbon atoms, straight chain alkoxy of 1 to 10 carbon atoms or C.sub.2 H.sub.5 --CH(CH.sub.3)--(CH.sub.2).sub.n --, and n is an integer of 1 to 3;
- (e) about 0 to about 30 mol percent of a trans-cyclohexane carboxylic acid phenyl ester of the formula:
- ##STR32## wherein R.sup.1 is straight chain alkyl of 3 to 7 carbon atoms and R.sup.3 is cyano or straight chain alkoxy of 1 to 3 carbon atoms;
- and
- (f) about 0 to about 30 mol percent of a Schiffs base of the formula:
- ##STR33## wherein R.sup.1 is straight chain alkyl of 3 to 7 carbon atoms.
10 more elements
A liquid crystalline mixture comprising:
- (a) about 30 to about 70 mol percent of one or more trans-phenyl-dioxanes of the formula:
- ##STR34## wherein R.sup.1 is propyl, butyl or pentyl;
- (b) about 10 to about 25 mol percent of one or more phenylpyrimidines of the formula:
- ##STR35## wherein R.sup.1 is pentyl or heptyl;
- (c) about 5 to about 17 mol percent of one or more phenylbenzoates of the formula:
- ##STR36## wherein R.sub.2 is ethyl, butyl or pentyl;
- (d) about 2 to about 10 mol percent of one or more compounds of the formula:
- ##STR37## wherein R is ethyl, pentyl or heptyl;
- (e) about 10 to about 30 mol percent of one or more trans-cyclohexane carboxylic acid phenyl esters of the formula:
- ##STR38## wherein R.sup.1 is propyl, butyl or pentyl and R.sub.3 is cyano, methoxy, ethoxy or propyloxy;
- and
- (f) about 10 to about 25 percent of one or more Schiffs bases of the formula:
- ##STR39## wherein R.sup.1 is propyl, butyl or hexyl.
10 more elements
In an electro-optical liquid crystal display containing a liquid crystalline mixture having positive dielectric anisotrophy, the improvement wherein the liquid crystalline mixture comprises:
- (a) about 10 to about 75 mol percent of a trans-phenyl-dioxane of the formula:
- ##STR40## wherein R.sup.1 is straight-chain alkyl of 3 to 7 carbon atoms;
- (b) about 5 to about 30 mol percent of a phenylpyrimidine of the formula:
- ##STR41## wherein R.sup.1 is as above;
- and (c) about 2 to about 20 mol percent of a phenylbenzoate of the formula:
- ##STR42## wherein R.sup.2 is straight-chain alkyl of 2 to 7 carbon atoms.
3 more elements
Dependencies are inferred from the claim text.