US5538768A
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Liquid-crystalline material
Assignee: Merck Patent GmbH
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Filing: 1994-07-01
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Granted: 1996-07-23
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Expires: 2014-07-01
Abstract
Abstract The invention relates to a liquid-crystalline material in the form of an anisotropic gel consisting of a polymerized liquid-crystalline material and a low-molecular weight liquid-crystalline material, wherein the polymerized material (a) forms a permanently oriented network in the low-molecular liquid-crystalline material (b), characterized in that the low-molecular weight liquid-crystalline material (b) exhibits a cholesteric phase, and to a display cell with such a material.
Inventors
- 👤 Shirley A. Marden
- 👤 David Coates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:50
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/54; C09K19/542; C09K19/04; C09K19/42; C09K19/46; C09K2323/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
396 words
A liquid-crystalline anisotropic gel material comprising: a polymerized liquid-crystalline material (a), and a low-molecular weight liquid-crystalline material (b), wherein said polymerized material (a) forms a permanently oriented network within said low-molecular weight liquid-crystalline material (b) said low-molecular weight liquid-crystalline material (b) comprises: at least one achiral mesogenic compound of formula I R.sup.1 -(A.sup.1 -Z.sup.1).sub.o -A.sup.2 -R.sup.2 (I) wherein R 1 and R 2 are each, independently, straight-chained or branched alkyl or alkenyl with up to 16 C atoms in which one or two non-adjacent CH 2 groups may be replaced by --O--, --CO--O--, --O--CO-- or --O--CO--O--, one of R 1 and R 2 may also be H, F, Cl, CF 3 , OCF 3 , OCF 2 H or CN; A 1 and A 2 are each, independently, optionally fluorinated 1,4-phenylene in which one or two CH groups may be replaced by N or 1,4-cyclohexylene in which one or two non-adjacent CH 2 groups may be replaced by O; Z 1 is --CO--O--, --O--CO--, --OCH 2 --, --CH 2 CH 2 --, --C.tbd.C--, --C.tbd.C--C.tbd.C-- or a single bond; and o is 1, 2 or 3; at least one chiral mesogenic compound of formula IV ##STR111## wherein R o is CH 3 , C 6 H 5 , F, Cl, CN or CF 3 ; n is 0, 1 or 2; m is 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10; R 3 is straight-chained or branched alkyl or alkenyl with up to 16 C atoms in which one or two non-adjacent CH 2 groups may be replaced by --O--, --CO--O--, --O--CO-- or --O--CO--O--, R 3 can also be H, F, Cl, CF 3 , OCF 3 , OCF 2 H or CN; A 3 and A 4 are each, independently, optionally fluorinated 1,4-phenylene in which one or two CH groups may be replaced by N or 1,4-cyclohexylene in which one or two non-adjacent CH 2 groups may be replaced by O; Z 2 is --CO--O--, --O--CO--, --OCH 2 --, --CH 2 O--, --CH 2 CH 2 --, --C.tbd.C--, --C.tbd.C--C.tbd.C-- or a single bond; and p is 0, 1 or 2; and at least one chiral mesogenic compound selected from formulae V-VII: ##STR112## wherein R 3 , R o , A 3 , A 4 , Z 2 , n, m and p have the meanings defined above, and q is 0 or 1.
Claim 2
Dependent Claim
396 words
A liquid-crystalline anisotropic gel material comprising: a polymerized liquid-crystalline material (a), and a low-molecular weight liquid-crystalline material (b), wherein said polymerized material (a) forms a permanently oriented network within said low-molecular weight liquid-crystalline material (b) said low-molecular weight liquid-crystalline material (b) comprises: at least one achiral mesogenic compound of formula I R.sup.1 -(A.sup.1 -Z.sup.1).sub.o -A.sup.2 -R.sup.2 (I) wherein R 1 and R 2 are each, independently, straight-chained or branched alkyl or alkenyl with up to 16 C atoms in which one or two non-adjacent CH 2 groups may be replaced by --O--, --CO--O--, --O--CO-- or --O--CO--O--, one of R 1 and R 2 may also be H, F, Cl, CF 3 , OCF 3 , OCF 2 H or CN; A 1 and A 2 are each, independently, optionally fluorinated 1,4-phenylene in which one or two CH groups may be replaced by N or 1,4-cyclohexylene in which one or two non-adjacent CH 2 groups may be replaced by O; Z 1 is --CO--O--, --O--CO--, --OCH 2 --, --CH 2 CH 2 --, --C.tbd.C--, --C.tbd.C--C.tbd.C-- or a single bond; and o is 1, 2 or 3; at least one chiral mesogenic compound of formula IV ##STR111## wherein R o is CH 3 , C 6 H 5 , F, Cl, CN or CF 3 ; n is 0, 1 or 2; m is 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10; R 3 is straight-chained or branched alkyl or alkenyl with up to 16 C atoms in which one or two non-adjacent CH 2 groups may be replaced by --O--, --CO--O--, --O--CO-- or --O--CO--O--, R 3 can also be H, F, Cl, CF 3 , OCF 3 , OCF 2 H or CN; A 3 and A 4 are each, independently, optionally fluorinated 1,4-phenylene in which one or two CH groups may be replaced by N or 1,4-cyclohexylene in which one or two non-adjacent CH 2 groups may be replaced by O; Z 2 is --CO--O--, --O--CO--, --OCH 2 --, --CH 2 O--, --CH 2 CH 2 --, --C.tbd.C--, --C.tbd.C--C.tbd.C-- or a single bond; and p is 0, 1 or 2; and at least one chiral mesogenic compound selected from formulae V-VII: ##STR112## wherein R 3 , R o , A 3 , A 4 , Z 2 , n, m and p have the meanings defined above, and q is 0 or 1.
Claim 3
Dependent Claim
31 words
A liquid-crystalline anisotropic gel material according to claim 1, wherein R o is CH 3 in formulae IV, VI, VII and R o is C 6 H 5 in formula V.
Claim 4
Dependent Claim
124 words
A liquid-crystalline anisotropic gel material according to claim 1, wherein material (b) contains at least one chiral compound selected from the formulae IVa or IVb ##STR113## wherein R 3 is straight-chained or branched alkyl or alkenyl with up to 16 C atoms in which one or two non-adjacent CH 2 groups may be replaced by --O--, --CO--O--, --O--CO-- or --O--CO--O--, R 3 can also be H, F, Cl, CF 3 , OCF 3 , OCF 2 H or CN, and m is 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10; and at least one chiral compound selected from formulae Va, Vb, VIa or VIIa: ##STR114## wherein ##STR115## are each independently ##STR116## and R 3 and m have the meanings given above.
Claim 5
Dependent Claim
114 words
A liquid-crystalline anisotropic gel material according to claim 1, wherein said at least one achiral mesogenic compound is selected from formulae Ia, Ib or Ic ##STR117## wherein R 1 is straight-chained or branched alkyl or alkenyl with up to 16 C atoms in which one or two non-adjacent CH 2 groups may be replaced by --O--, --CO--O--, --O--CO-- or --O--CO--O--, R 1 can also be H, F, Cl, CF 3 , OCF 3 , OCF 2 H or CN; L 1 is H or F; X 1 is F or Cl; Z 1 is --COO--, --CH 2 CH 2 -- or a single bond; ##STR118## is ##STR119## and Y is 0, 1 or 2.
Claim 6
Dependent Claim
88 words
A liquid-crystalline anisotropic gel material according to claim 4, wherein said material (b) contains at least one achiral compound selected from formulae Ia1-Ia4, Ib1, Ic1 or Ic2: ##STR120## wherein R 1 is straight-chained or branched alkyl or alkenyl with up to 16 C atoms in which one or two non-adjacent CH 2 groups may be replaced by --O--, --CO--O--, --O--CO-- or --O--CO--O--, R 1 can also be H, F, Cl, CF 3 , OCF 3 , OCF 2 H or CN; and L 1 is H or F.
Claim 7
Dependent Claim
53 words
A liquid-crystalline anisotropic gel material according to claim 1, wherein said material (b) consists essentially of: 5- 88wt. % of at least one compound of formula I; 1-30 wt. % of at least one compound of formula IV; and 0.1-10 wt. % of at least one compound selected from formulae V and VI.
Claim 8
Dependent Claim
50 words
A liquid-crystalline anisotropic gel material according to claim 1, wherein said material (b) consists essentially of: 50-88 wt. % of at least one compound of formula I; 1-30 wt. % of at least one compound of formula IV; and 1-30 wt. % of at least one compound of formula VII.
Claim 9
Dependent Claim
64 words
A liquid-crystalline anisotropic gel material according to claim 1, wherein said material (b) consists essentially of: 50-88 wt. % of at least one compound of formula I; 1-30 wt. % of at least one compound of formula IV; 0.1-10 wt. % of at least one compound selected from formulae V and VI; and 1-30 wt. % of at least one compound of formula VII.
Claim 10
Dependent Claim
67 words
A liquid-crystalline anisotropic gel material according to claim 1, wherein said material (b) contains at least one chiral mesogenic compound containing a structural element of formula 4 ##STR121## wherein R o is CH 3 , C 6 H 5 , F, Cl, CN or CF 3 , n is 0, 1 or 2, and m is 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10.
Claim 11
Dependent Claim
188 words
A display cell comprising: two opposite plates, each of which is transparent to light, as substrates, said plates are provided with an electrode, made of a material transparent to light, on their sides facing each other, said electrode carrying an orientation layer; a sealing material provided between the ends of said plates; and a liquid-crystalline material in the space between said plates and sealing material, wherein said liquid-crystalline material is an anisotropic gel material comprising: a polymerized liquid-crystalline material (a), and a low-molecular weight liquid-crystalline material (b), wherein said polymerized material (a) forms a permanently oriented network within said low-molecular weight liquid-crystalline material (b), said low-molecular weight liquid-crystalline material (b) exhibits a cholesteric phase and is a liquid-crystalline medium comprising at least one chiral mesogenic compound comprising a structural element of formula 1 and at least one other chiral mesogenic compound comprising a structural element from formulae 2-4: ##STR122## wherein R o is CH 3 , C 6 H 5 , F, Cl, CN or CF 3 , n is 0, 1 or 2, and m is 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10.
Claim 12
Dependent Claim
188 words
A display cell comprising: two opposite plates, each of which is transparent to light, as substrates, said plates are provided with an electrode, made of a material transparent to light, on their sides facing each other, said electrode carrying an orientation layer; a sealing material provided between the ends of said plates; and a liquid-crystalline material in the space between said plates and sealing material, wherein said liquid-crystalline material is an anisotropic gel material comprising: a polymerized liquid-crystalline material (a), and a low-molecular weight liquid-crystalline material (b), wherein said polymerized material (a) forms a permanently oriented network within said low-molecular weight liquid-crystalline material (b), said low-molecular weight liquid-crystalline material (b) exhibits a cholesteric phase and is a liquid-crystalline medium comprising at least one chiral mesogenic compound comprising a structural element of formula 1 and at least one other chiral mesogenic compound comprising a structural element from formulae 2-4: ##STR122## wherein R o is CH 3 , C 6 H 5 , F, Cl, CN or CF 3 , n is 0, 1 or 2, and m is 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10.
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