Ester-azoxy compounds

Claim 2

P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene represented by the general formula: ##STR60## wherein R and R' are straight-chain alkyl groups having one to eight carbon atoms.

Claim 3

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein the R group has two to seven carbon groups and the R' group has one to five carbon atoms.

Claim 4

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein the R and R' groups are pentyl to define P-(trans-4-pentylcyclohexylcarbonyloxy)-P'-pentylazoxybenzene having the formula ##STR61##

Claim 5

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein R is ethyl and R' is methyl to define P-(trans-4-ethylcyclohexylcarbonyloxy)-P'-methylazoxybenzene having the formula ##STR62##

Claim 6

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein R is propyl and R' is methyl to define P-(trans-4-propylcyclohexylcarbonyloxy)-P'-methylazoxybenzene having the formula ##STR63##

Claim 7

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein R is butyl and R' is methyl to define P-(trans-4-butylcyclohexylcarbonyloxy)-P'-ethylazoxybenzene having the formula ##STR64##

Claim 8

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein the R and R' groups are ethyl to define P-(trans-4-ethylcyclohexylcarbonyloxy)-P'-ethylazoxybenzene having the formula ##STR65##

Claim 9

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein R is propyl and R' is ethyl to define P-(trans-4-propylcyclohexylcarbonyloxy)-P'-ethylazoxybenzene having the formula ##STR66##

Claim 10

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein R is butyl and R' is ethyl to define P-(trans-4-butylcyclohexylcarbonyloxy)-P'-ethylazoxybenzene having the formula ##STR67##

Claim 11

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein R is pentyl and R' is ethyl to define P-(trans-4-pentylcyclohexylcarbonyloxy)-P'-ethylazoxybenzene having the formula ##STR68##

Claim 12

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein R is ethyl and R' is propyl to define P-(trans-4-ethylcyclohexylcarbonyloxy)-P'-propylazoxybenzene having the formula ##STR69##

Claim 13

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein the R and R' groups are propyl to define P-(trans-4-propylcyclohexylcarbonyloxy)-P'-propylazoxybenzene having the formula ##STR70##

Claim 14

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein R is butyl and R' is propyl to define P-(trans-4-butylcyclohexylcarbonyloxy)-P'-propylazoxybenzene having the formula ##STR71##

Claim 15

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein R is pentyl and R' is propyl to define P-(trans-4-pentylcyclohexylcarbonyloxy)-P'-propylazoxybenzene having the formula ##STR72##

Claim 16

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein R is hexyl and R' is propyl to define P'(trans-4-hexylcyclohexylcarbonyloxy)-P'-propylazoxybenzene having the formula ##STR73##

Claim 17

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein R is heptyl and R' is propyl to define P-(trans-4-heptylcyclohexylcarbonyloxy)-P'-propylazoxybenzene having the formula ##STR74##

Claim 18

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein R is propyl and R' is butyl to define P-(trans-4-propylcyclohexylcarbonyloxy)-P'-butylazoxybenzene having the formula ##STR75##

Claim 19

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein the R and R' groups are butyl to define P-(trans-4-butylcyclohexylcarbonyloxy)-P'-butylazoxybenzene having the formula ##STR76##

Claim 20

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein R is pentyl and R' is butyl to define P-(trans-4-pentylcyclohexylcarbonyloxy)-P'-butylazoxybenzene having the formula ##STR77##

Claim 21

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein R is hexyl and R' is butyl to define P-(trans-4-hexylcyclohexylcarbonyloxy)-P'-butylazoxybenzene having the formula ##STR78##

Claim 22

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein R is heptyl and R' is butyl to define P-(trans-4-heptylcyclohexylcarbonyloxy)-P'-butylazoxybenzene having the formula ##STR79##

Claim 23

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein R is propyl and R' is pentyl to define P-(trans-4-propylcyclohexylcarbonyloxy)-P'-pentylazoxybenzene having the formula ##STR80##

Claim 24

The P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene of claim 1, wherein R is butyl and R' is pentyl to define P-(trans-4-butylcyclohexylcarbonyloxy)-P'-pentylazoxybenzene having the formula ##STR81##

Claim 25

A liquid crystal mixture comprising P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene having the general formula ##STR82## wherein R and R' are straight-chain alkyl groups having from one to eight carbon atoms.

Claim 26

A liquid crystal mixture comprising P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene having the general formula ##STR82## wherein R and R' are straight-chain alkyl groups having from one to eight carbon atoms.

Claim 27

The mixture of claim 24, wherein the R group has two to seven carbon atoms and the R' group has one to five carbon atoms.

Claim 28

The liquid crystal mixture of claim 24, wherein the P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene is present in an amount ranging from at least an effective amount to increase the liquid crystal temperature range to about 30 weight percent.

Claim 29

The liquid crystal mixture of claim 24, wherein the liquid crystal mixture further includes at least one twisted nematic-type liquid crystal material.

Claim 30

The liquid crystal mixture of claim 27, wherein the twisted nematic liquid crystal material comprises azoxy-type liquid crystals, ester-type liquid crystals or mixtures thereof.

Claim 31

A liquid crystal display device, comprising two opposed substantially parallel substrates with liquid crystal electrodes selectively disposed on the interior surfaces thereof, a liquid crystal composition in the space between the substrates, circuit means for generating signals to be selectively applied to the liquid crystal electrodes for rendering the liquid crystal composition between the electrodes visually distinguishable from the remaining liquid crystal composition, the liquid crystal composition comprising at least one P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene having the general formula ##STR83## wherein R and R' are straight-chain alkyl groups having from one to eight carbon atoms.

Claim 32

A liquid crystal display device, comprising two opposed substantially parallel substrates with liquid crystal electrodes selectively disposed on the interior surfaces thereof, a liquid crystal composition in the space between the substrates, circuit means for generating signals to be selectively applied to the liquid crystal electrodes for rendering the liquid crystal composition between the electrodes visually distinguishable from the remaining liquid crystal composition, the liquid crystal composition comprising at least one P-(trans-4-alkylcyclohexylcarbonyloxy)-P'-alkylazoxybenzene having the general formula ##STR83## wherein R and R' are straight-chain alkyl groups having from one to eight carbon atoms.

Claim 33

The liquid crystal display device of claim 29, wherein the R group has from two to seven carbon atoms and the R' group has from one to five carbon atoms.