Nematic liquid crystal composition

Claim 2

A nematic liquid crystal composition of net positive dielectric anisotropy having a wide temperature range of operation and suitable for use in display cells consisting apart from minor impurities and additions of 68 to 76 weight percent of at least one compound having the general formula ##STR65## indicated by the character (I), where R is an n-alkyl group having 3 to 9 carbon atoms; and at least one compound from each of at least two types of compounds selected from the three types of compounds having respectively, the formulas ##STR66## indicated by the character, (II), ##STR67## indicated by the character (III) and ##STR68## indicated by the character (IV), where R is an n-alkyl group having 5 to 6 carbon atoms.

Claim 3

A nematic liquid crystal composition of net positive dielectric anisotropy having a wide temperature range of operation and suitable for use in display cells, wherein said composition consists essentially, apart from minor impurities, of __________________________________________________________________________ ##STR69## P-cyanophenyl-P'-n- butylbenzoate 6 wt. % ##STR70## P-cyanophenyl-P'-n- amylbenzoate 11 wt. % ##STR71## P-cyanophenyl-P'-n- hexylbenzoate 16 wt. % ##STR72## P-cyanophenyl-P'-n- heptylbenzoate 15 wt. % ##STR73## P-cyanophenyl-P'-n- octylbenzoate 20 wt. % ##STR74## P-n-hexyloxyphenyl-P'- n-amylbenzoate 16 wt. % ##STR75## P-n-heptylphenyl-P'- n-hexyloxybenzoate 16 wt. % __________________________________________________________________________ said composition having a melting point below 0° C and a clearing point above 50° C.

Claim 4

A nematic liquid crystal composition of net positive dielectric anisotropy having a wide temperature range of operation and suitable for use in display cells, wherein said composition consists essentially, apart from minor impurities, of __________________________________________________________________________ ##STR69## P-cyanophenyl-P'-n- butylbenzoate 6 wt. % ##STR70## P-cyanophenyl-P'-n- amylbenzoate 11 wt. % ##STR71## P-cyanophenyl-P'-n- hexylbenzoate 16 wt. % ##STR72## P-cyanophenyl-P'-n- heptylbenzoate 15 wt. % ##STR73## P-cyanophenyl-P'-n- octylbenzoate 20 wt. % ##STR74## P-n-hexyloxyphenyl-P'- n-amylbenzoate 16 wt. % ##STR75## P-n-heptylphenyl-P'- n-hexyloxybenzoate 16 wt. % __________________________________________________________________________ said composition having a melting point below 0° C and a clearing point above 50° C.

Claim 5

A nematic liquid crystal composition of net positive dielectric anisotropy having a wide temperature range of operation and suitable for use in display cells, wherein said composition consists essentially, apart from minor impurities, of __________________________________________________________________________ ##STR76## P-cyanophenyl-P'-n- butylbenzoate 5 wt.% ##STR77## P-cyanophenyl-P'-n- amylbenzoate 11 wt. % ##STR78## P-cyanophenyl-P'-n- hexylbenzoate 18 wt. % ##STR79## P-cyanophenyl-P'-n- heptylbenzoate 18 wt. % ##STR80## P-cyanophenyl-P'-n- octylbenzoate 19 wt. % ##STR81## P-n-heptylphenyl-P'-n- hexyloxybenzoate 19 wt. % ##STR82## P-n-octyloxyphenyl-P'- n-amyloxybenzoate 10 wt. % __________________________________________________________________________ said composition having a melting point below -3° C and a clearing point above 55° C.

Claim 6

A nematic liquid crystal composition of net positive dielectric anisotropy having a wide temperature range of operation and suitable for use in display cells, wherein said composition consists essentially, apart from minor impurities, of __________________________________________________________________________ ##STR76## P-cyanophenyl-P'-n- butylbenzoate 5 wt.% ##STR77## P-cyanophenyl-P'-n- amylbenzoate 11 wt. % ##STR78## P-cyanophenyl-P'-n- hexylbenzoate 18 wt. % ##STR79## P-cyanophenyl-P'-n- heptylbenzoate 18 wt. % ##STR80## P-cyanophenyl-P'-n- octylbenzoate 19 wt. % ##STR81## P-n-heptylphenyl-P'-n- hexyloxybenzoate 19 wt. % ##STR82## P-n-octyloxyphenyl-P'- n-amyloxybenzoate 10 wt. % __________________________________________________________________________ said composition having a melting point below -3° C and a clearing point above 55° C.

Claim 7

A nematic liquid crystal composition of net positive dielectric anisotropy having a wide temperature range of operation and suitable for use in display cells, wherein said composition consists essentially, apart from minor impurities, of __________________________________________________________________________ ##STR83## P-cyanophenyl-P'-n- butylbenzoate 7 wt. % ##STR84## P-cyanophenyl-P'-n- amylbenzoate 11 wt. % ##STR85## P-cyanophenyl-P'-n- hexylbenzoate 19 wt. % ##STR86## P-cyanophenyl-P'-n- heptylbenzoate 17 wt. % ##STR87## P-cyanophenyo-P'-n- ocyylbenzoate 22 wt. % ##STR88## P-n-hexyloxyphenyl-P'- n-amylbenzoate 17 wt. % ##STR89## P-n-octyloxyphenyl-P'- n-amyloxybenzoate 7 wt. % __________________________________________________________________________ said composition having a melting point below -4° C and a clearing point above 53.5° C.

Claim 8

A nematic liquid crystal composition of net positive dielectric anisotropy having a wide temperature range of operation and suitable for use in display cells, wherein said composition consists essentially, apart from minor impurities, of __________________________________________________________________________ ##STR83## P-cyanophenyl-P'-n- butylbenzoate 7 wt. % ##STR84## P-cyanophenyl-P'-n- amylbenzoate 11 wt. % ##STR85## P-cyanophenyl-P'-n- hexylbenzoate 19 wt. % ##STR86## P-cyanophenyl-P'-n- heptylbenzoate 17 wt. % ##STR87## P-cyanophenyo-P'-n- ocyylbenzoate 22 wt. % ##STR88## P-n-hexyloxyphenyl-P'- n-amylbenzoate 17 wt. % ##STR89## P-n-octyloxyphenyl-P'- n-amyloxybenzoate 7 wt. % __________________________________________________________________________ said composition having a melting point below -4° C and a clearing point above 53.5° C.

Claim 9

A nematic liquid crystal composition of net positive dielectric anisotropy having a wide temperature range of operation and suitable for use in display cells, wherein said composition consists essentially, apart from minor impurities, of __________________________________________________________________________ ##STR90## P-cyanophenyl-P'-n- butylbenzoate 10 wt. % ##STR91## P-cyanophenyl-P'-n- amylbenzoate 14 wt. % ##STR92## P-cyanophenyl-P'-n- heptylbenzoate 22 wt. % ##STR93## P-cyanophenyl-P'-n- octylbenzoate 24 wt. % ##STR94## P-n-hexyloxyphenyl-P'- n-amylbenzoate 10 wt. % ##STR95## P-n-heptylphenyl-P'-n- hexyloxybenzoate 10 wt. % ##STR96## P-n-octyloxyphenyl-P'-n- hexyloxybenzoate 10 wt. % __________________________________________________________________________ said composition having a melting point below -6° C and a clearing point above 57° C.

Claim 10

A nematic liquid crystal composition of net positive dielectric anisotropy having a wide temperature range of operation and suitable for use in display cells, wherein said composition consists essentially, apart from minor impurities, of __________________________________________________________________________ ##STR90## P-cyanophenyl-P'-n- butylbenzoate 10 wt. % ##STR91## P-cyanophenyl-P'-n- amylbenzoate 14 wt. % ##STR92## P-cyanophenyl-P'-n- heptylbenzoate 22 wt. % ##STR93## P-cyanophenyl-P'-n- octylbenzoate 24 wt. % ##STR94## P-n-hexyloxyphenyl-P'- n-amylbenzoate 10 wt. % ##STR95## P-n-heptylphenyl-P'-n- hexyloxybenzoate 10 wt. % ##STR96## P-n-octyloxyphenyl-P'-n- hexyloxybenzoate 10 wt. % __________________________________________________________________________ said composition having a melting point below -6° C and a clearing point above 57° C.

Claim 11

A nematic liquid crystal composition suitable for use in a display cell, wherein said composition consists essentially of, apart from minor impurities: __________________________________________________________________________ ##STR97## P-n-heptyl-P'-cyanobiphenyl 10 wt. % ##STR98## P-cyanophenyl-P'-n- amylbenzoate 14 wt. % ##STR99## P-cyanophenyl-P'-n- heptylbenzoate 22 wt. % ##STR100## P-cyanophenyl-P'-n- octylbenzoate 24 wt. % ##STR101## P-n-hexyloxyphenyl-P'- n-amylbenzoate 10 wt. % ##STR102## P-n-heptylphenyl-P'- n-hexyloxybenzoate 10 wt. % ##STR103## P-n-octyloxyphenyl-P'- n-hexyloxybenzoate 10 wt. % __________________________________________________________________________ said composition having a melting point below -7° C and a clearing point above 56° C.

Claim 12

A nematic liquid crystal composition suitable for use in a display cell, wherein said composition consists essentially of, apart from minor impurities: __________________________________________________________________________ ##STR97## P-n-heptyl-P'-cyanobiphenyl 10 wt. % ##STR98## P-cyanophenyl-P'-n- amylbenzoate 14 wt. % ##STR99## P-cyanophenyl-P'-n- heptylbenzoate 22 wt. % ##STR100## P-cyanophenyl-P'-n- octylbenzoate 24 wt. % ##STR101## P-n-hexyloxyphenyl-P'- n-amylbenzoate 10 wt. % ##STR102## P-n-heptylphenyl-P'- n-hexyloxybenzoate 10 wt. % ##STR103## P-n-octyloxyphenyl-P'- n-hexyloxybenzoate 10 wt. % __________________________________________________________________________ said composition having a melting point below -7° C and a clearing point above 56° C.

Claim 13

A nematic liquid crystal composition suitable for use in a display cell, wherein said composition consists essentially of, apart from minor impurities: __________________________________________________________________________ ##STR104## P-cyanophenyl-P'-n- butylbenzoate 9.90 wt. % ##STR105## P-cyanophenyl-P'-n- amylbenzoate 13.86 wt. % ##STR106## P-cyanophenyl-P'-n- heptylbenzoate 21.78 wt. % ##STR107## P-cyanophenyl-P'-n- octylbenzoate 23.76 wt. % ##STR108## P-n-hexyloxyphenyl-P'- n-amylbenzoate 9.90 wt. % ##STR109## P-n-heptylphenyl-P'- n-hexyloxybenzoate 9.90 wt. % ##STR110## P-n-octyloxyphenyl n-hexyloxybenzoate 9.90 wt. % ##STR111## P-methoxyphenol .99 wt. % __________________________________________________________________________

Claim 14

A nematic liquid crystal composition suitable for use in a display cell, wherein said composition consists essentially of, apart from minor impurities: __________________________________________________________________________ ##STR104## P-cyanophenyl-P'-n- butylbenzoate 9.90 wt. % ##STR105## P-cyanophenyl-P'-n- amylbenzoate 13.86 wt. % ##STR106## P-cyanophenyl-P'-n- heptylbenzoate 21.78 wt. % ##STR107## P-cyanophenyl-P'-n- octylbenzoate 23.76 wt. % ##STR108## P-n-hexyloxyphenyl-P'- n-amylbenzoate 9.90 wt. % ##STR109## P-n-heptylphenyl-P'- n-hexyloxybenzoate 9.90 wt. % ##STR110## P-n-octyloxyphenyl n-hexyloxybenzoate 9.90 wt. % ##STR111## P-methoxyphenol .99 wt. % __________________________________________________________________________

Claim 15

An improvement in a timepiece including a display device including an electro-optical liquid crystal display cell and electronic circuitry for timekeeping and activating said display device, wherein said improvement comprises the composition of claim 1 in said cell.