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EP0377516A2
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Liquid crystal compounds having high optical anisotropy
Assignee: JNC Corp
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Filing: 1990-01-05
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Granted: —
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Expires: 2010-01-05
Abstract
Abstract Liquid crystal compounds having a high optical anisotropy Δn value and yet a low viscosity which, when added to a liquid crystal composition increase the Δn value without lowering the NI point or raising theviscosity of the composition, are 4-substituted-4′-(1-alkynyl)tolans of the formula: wherein R¹ and R² each represent a C₁-C₈ alkyl group in which one CH₂ group or two non-adjacent CH₂ groups may be replaced by an O atom, -CO- group, -CO-O- group, -O-CO- group or -CH=CH- group; -Ⓐ- represents an unsubstituted 1,4-phenylene group, a 1,4-phenylene having one or two F, Cℓ or Br atoms or CN grups as substituents, a 1,4-cyclohexylene group, a pyrimidine-2,5-diyl group or a 1,3-dioxane-2,5-diyl group; X represents a group -COO-, -OCO-, -CH₂CH₂-, -OCH₂-, -CH₂O- or -CH=CH- or a single bond; n is 0 or 1 (and when n is O, X represents a single bond); and Y is H or F.
Inventors
- 👤 Yasuyuki Goto
- 👤 Kisei Kitano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 21:03
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/84; C07C69/92; C07C43/00; C07C43/02; C07C43/20; C07C43/215; C07C13/00; C07C13/28; C07C15/00; C07C15/40; C07C15/50; C07C15/54; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/14; C09K19/18; C09K19/20; C09K19/2007; C09K19/2021; C09K19/2028; C09K19/30; C09K19/3001; C09K19/3059; C09K19/34; C09K19/3402; C09K19/3441; C09K19/345; C09K19/3458; C09K19/3461; C07C2601/00; C07C2601/12; C07C2601/14; C09K2019/3422
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
4-Substituted-4′-(1-alkynyl)tolans of the formula: wherein R¹ and R² each represent a C₁-C₈ alkyl group in which one CH₂ group or two non-adjacent CH₂ groups may be replaced by an O atom, -CO- group, -CO-O-group, -O-CO- group or -CH=CH- group; -Ⓐ- represents an unsubstituted 1,4-phenylene group, a 1,4-phenylene having one or two F, Cℓ or Br atoms or CN grups as substituents, a 1,4-cyclohexylene group, a pyrimidine-2,5-diyl group or a 1,3-dioxane-2,5-diyl group; X represents a group -COO-, -OCO-, -CH₂CH₂-, -OCH₂-, -CH₂O- or -CH=CH- or a single bond; n is 0 or 1 (and when n is O, X represents a single bond); and Y is H or F.
Claim 2
Dependent Claim
107 words
4-Substituted-4′-(1-alkynyl)tolans of the formula: wherein R¹ and R² each represent a C₁-C₈ alkyl group in which one CH₂ group or two non-adjacent CH₂ groups may be replaced by an O atom, -CO- group, -CO-O-group, -O-CO- group or -CH=CH- group; -Ⓐ- represents an unsubstituted 1,4-phenylene group, a 1,4-phenylene having one or two F, Cℓ or Br atoms or CN grups as substituents, a 1,4-cyclohexylene group, a pyrimidine-2,5-diyl group or a 1,3-dioxane-2,5-diyl group; X represents a group -COO-, -OCO-, -CH₂CH₂-, -OCH₂-, -CH₂O- or -CH=CH- or a single bond; n is 0 or 1 (and when n is O, X represents a single bond); and Y is H or F.
Claim 3
Dependent Claim
17 words
A tolan compound according to claim 1 wherein n is O and X represents a single bond.
Claim 4
Dependent Claim
19 words
A tolan compound according to claim 1, wherein n is 1, -Ⓐ- represents and X represents a single bond.
Claim 5
Dependent Claim
19 words
A tolan compound according to claim 1, wherein n is 1, -Ⓐ- represents and X represents a single bond.
Claim 6
Dependent Claim
19 words
A tolan compound according to claim 1, wherein n is 1, -Ⓐ- represents and X represents a group -COO-.
Claim 7
Dependent Claim
19 words
A tolan compound according to claim 1, wherein n is 1, -Ⓐ- represents and X represents a group -COO-.
Claim 8
Dependent Claim
19 words
A tolan compound according to claim 1, wherein n is 1, -Ⓐ- represents and X represents a group -CH₂-CH₂.
Claim 9
Dependent Claim
27 words
A liquid crystal composition comprising at least two components, at least one of which is a tolan compound as claimed in any one of the preceding claims.
Claim 10
Dependent Claim
133 words
A liquid crystal element, wherein a nematic liquid crystal having a positive dielectric anisotropy value, together with an added rotatory polarization substance, is sealed between a pair of opposed upper and lower electrode substrates; liquid crystal molecules form a 160-170° - twisted, helical structure in the thickness direction thereof; the polarization axis of polarizing plates provided placing the helical structure therebetween deviates within 20 to 70° from the direction of liquid crystal molecule arrangement in the electrode substrates; the product of thethickness of the liquid crystal layer (d) times the optical anisotropy value of the liquid crystal layer (Δn x d) is from 0.7 to 1.2 ∂m; a liquid crystal composition containing 0.1 to 40% by weight of a tolan compound as claimed in claim 1, being provided in the liquid crystal element.
References Cited (Backward Citations)
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