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  • C09K19/00—Liquid crystal materials
  • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
  • C09K19/06—Non-steroidal liquid crystal compounds
  • C09K19/32—Non-steroidal liquid crystal compounds containing condensed ring systems, i.e. fused, bridged or spiro ring systems
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  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C255/00—Carboxylic acid nitriles
  • C07C255/49—Carboxylic acid nitriles having cyano groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton
  • C07C255/54—Carboxylic acid nitriles having cyano groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton containing cyano groups and etherified hydroxy groups bound to the carbon skeleton
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  • C07C69/76—Esters of carboxylic acids having a carboxyl group bound to a carbon atom of a six-membered aromatic ring
  • C07C69/84—Esters of carboxylic acids having a carboxyl group bound to a carbon atom of a six-membered aromatic ring of monocyclic hydroxy carboxylic acids, the hydroxy groups and the carboxyl groups of which are bound to carbon atoms of a six-membered aromatic ring
  • C07C69/92—Esters of carboxylic acids having a carboxyl group bound to a carbon atom of a six-membered aromatic ring of monocyclic hydroxy carboxylic acids, the hydroxy groups and the carboxyl groups of which are bound to carbon atoms of a six-membered aromatic ring with etherified hydroxyl groups
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  • C09K19/06—Non-steroidal liquid crystal compounds
  • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
  • C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
  • C09K19/20—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters or ethers
  • C09K19/2007—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters or ethers the chain containing -COO- or -OCO- groups
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  • C09K19/00—Liquid crystal materials
  • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
  • C09K19/06—Non-steroidal liquid crystal compounds
  • C09K19/34—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring
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  • C09K19/00—Liquid crystal materials
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  • C09K19/00—Liquid crystal materials
  • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
  • C09K2019/0444—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group
  • C09K2019/0448—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group the end chain group being a polymerizable end group, e.g. -Sp-P or acrylate
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  • C09K19/00—Liquid crystal materials
  • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
  • C09K2019/0477—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit characterized by the positioning of substituents on phenylene
  • C09K2019/0481—Phenylene substituted in meta position
• • C—CHEMISTRY; METALLURGY
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  • C09K19/00—Liquid crystal materials
  • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
  • C09K19/06—Non-steroidal liquid crystal compounds
  • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
  • C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
  • C09K19/20—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters or ethers
  • C09K19/2007—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters or ethers the chain containing -COO- or -OCO- groups
  • C09K2019/2078—Ph-COO-Ph-COO-Ph

Definitions

• LCP films films prepared from curable Liquid Crystals
• US 5,650,534 discloses compounds and mixtures used to prepare components suitable for use non-linear optical (NLO) applications. These compounds are optically active and exhibit chiral smectic or chiral nematic mesophases.
• US 5,707,544 also discloses compounds and mixtures suitable for use in NLO applications. However, these compounds are characterised by relatively high melting points.
• US 5,593,617 discloses photochemically polymerisable liquid crystal compounds and mixtures, which are used to prepare optical and electronic components. However, these mixtures have a relatively narrow operating range and are unsuitable for use at higher temperatures.
• LCP films are generally manufactured by using known coating techniques such as spin coating. This involves casting an organic solution of a cross-linkable LCP or LCP mixture onto a substrate provided with an orientation layer. The organic solvent is subsequently removed to give a well-oriented, solvent-free mesogenic LCP layer, which in turn is cross-linked to give an LCP film.
• the desired optical performance of such films depends crucially on some reproducible physical parameters which the LCP material has to fulfil simultaneously.
• Such properties are a nematic mesophase, a high clearing point, a low melting point or a low tendency to crystallise when cooled below melting point (supercooling), good solubility in organic solvents, good miscibility with other LCPs, good aligning properties on orientation layers, and the ability to form an adjustable tilt out of the substrate plane essentially free of tilt domains and disclinations.
• Tilt domains are regions within the LCP film in which the long axes of the LCP molecules form tilt angles out of the plane of the substrate of the same size but in opposite direction. Disclinations are borderlines of neighbouring tilt domains where LCP molecules of opposite tilt angles are adjacent.
• LCPs For adjusting the optical properties of the layers and films prepared from LCPs as for example retardation films, it is further essential to have available a variety of LCP materials with differing optical anisotropy, mainly high optical anisotropy. It is known that LCPs exhibiting a high optical anisotropy often show a negative impact on several of the above properties. Particularly the formation of smectic mesophases, high melting points, an enhanced tendency to crystallise, a low solubility in organic solvents or reduced miscibility with other LCPs is observed. Furthermore the ability of homogeneous alignment free of tilt domains and disclinations is often reduced.
• R is selected from the group consisting of hydrogen, an achiral C M S alkyl group and an achiral C 4- ⁇ 8 alkenyl group with the double bond at
• R' is as defined above; with the proviso that at most one of the rings A, B and C is a naphthalenediyl group.
• laterally substituted mesogenic compounds referred to above such compounds are also disclosed in WO 95/24454 and WO 95/24455.
• optical anisotropy of the compounds of the invention may be easily adapted to requirements only by selecting different groups of M of formula I without changing the main core of the molecule. This allows an economical access to a broad range of LCPs exhibiting different optical anisotropies with a minimum of chemical steps in their production.
• the polymerisable mesogenic residues G ! and G 2 may be the same or different, but are preferably the same.
• the group X is preferably selected from the group consisting of -CH 2 -, -O-,
• the spacer group Sp may be optionally substituted by one or more fluorine or chlorine atoms. Groups in which there are no substituent groups present are preferred.
• the groups A and B comprising the achiral group M are either saturated, unsaturated or aromatic. They are optionally substituted by one or two substituents selected from the group consisting of F, Cl, CN, a lower alkyl, lower alkenyl, lower alkoxy and lower alkenyloxy. Preferably the groups A and B each contain no more that one substituent. It is especially preferred that the groups A and B contain no substitution.
• the groups A and B are selected from the group consisting of 1 ,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl, trans- 1,4-cyclohexylene or trans- l,3-dioxane-2,5-diyl, 1 ,4-naphthalenediyl and 2,6-naphthalenediyl.
• a and B are selected from the group consisting of
• the group C comprising the achiral group M is either saturated, unsaturated or aromatic. It is optionally substituted with one or two substituents selected from the group consisting of F, Cl, CN, a lower alkyl, lower alkenyl, lower alkoxy and lower alkenyloxy. It is preferred that the group C contains at most one substituent. It is especially preferred that the group C contains no substitution.
• the group C is selected from furan-2,4-diyl, furan-2,5-diyl, tetrahydrofuran-2,4-diyl, tetrahydrofuran-2,5-diyl, dioxolane-2,4-diyl, dioxolane-2,5- -diyl, oxazole-2,4-diyl, oxazole-2,5-diyl, cyclopentane-lJ-diyl, cyclopentane- 1 ,4-diyl, 1 ,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl, trans- 1,4-cyclohexylene or dioxane-2,5-diyl, 1 ,4-naphthalenediyl and 2,6- naphthalenediyl.
• C is selected from the group consisting of furan-2,5-diyl, tetrahydrofuran-2,5-diyl, oxazole-2,5-diyl, 1 ,4-phenylene, trans- 1,4-cyclohexylene, and 2,6-naphthalenediyl.
• the group Z 1 comprising the achiral group M is preferably selected from the group consisting of -O-, -COO-, -OOC- and a single bond. It is especially preferred that Z 1 is selected from -O- or a single bond.
• Z and Z are selected from the group consisting of -COO-, -OOC-, -C ⁇ C- and a single bond.
• the group R 1 comprising the achiral group M is preferably selected from the group consisting of -CN, -COOR, -OCOR, F, Cl, CF 3 , OCF 3 , OR, R, in which R represents a C-. 12 achiral alkyl, C - ⁇ 2 achiral alkenyl group with the double bond at position 3- or higher, or hydrogen. It is especially preferred that R 1 is selected from the group consisting of -CN, F, Cl, CF 3 , OCF 3 , OR, R, in which R represents a C
• lower alkyl it should be understood to include a C ⁇ - 6 achiral, branched or straight-chained alkyl group.
• Examples of lower alkyl groups that may be present in the compounds of the invention include methyl, ethyl, propyl, butyl, pentyl hexyl and the like.
• lower alkenyl it should be understood to include C 3-0 achiral, branched or straight-chained alkenyl group in which the double bond is at position 2- or higher.
• Examples of lower alkenyl groups that may be present in the compounds of the invention include 2-propenyl, 3-butenyl, 3-isopentenyl, 4-pentenyl, 5-hexenyl, 4-isohexenyl and the like.
• lower alkoxy it should be understood to include C ⁇ - 6 achiral, branched or straight-chained alkoxy group.
• lower alkoxy groups that may be present in the compounds of the invention include methoxy, ethoxy, propoxy, butoxy, pentoxy hexoxy and the like.
• alkenyloxy it should be understood to include C 3-6 achiral, branched or straight-chained alkenyloxy group in which the double bond is at position 2- or higher.
• Examples of lower alkenyloxy groups that may be present in the compounds of the invention include 2-propenyloxy, 3-butenyloxy, 4-pentenyloxy,
• polymerisable mesogenic residues G 1 and G are each independently represented by the group of formula III
• D and E are independently selected from the group consisting of 1 ,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl, trans- 1,4-cyclohexylene and trans-l,3-dioxane-2,5-diyl;
• n 1 or 0,
• R 3 -OOC-CH CH-Ph-O- and 2-W-epoxyethyl in which W represents H, Cl, Ph or a lower alkyl,
• R represents a lower alkyl with the proviso that when R is attached to a phenylene group (-Ph-) it may also represent hydrogen or a lower alkoxy.
• Ph and “Ph-” will be understood to indicate a phenyl group.
• -Ph- will be understood to mean any isomer of phenylene, namely 1,2- phenylene, 1,3-phenylene or 1 ,4-phenylene, except where the context requires otherwise.
• the groups D and E are optionally substituted with one or two halogens, -CN, lower alkyl, lower alkenyl, lower alkoxy or lower alkenyloxy groups. If halogen substituents are present they are preferably F or Cl. It is preferred that the groups D and E are selected from optionally substituted 1 ,4-phenylene and 1,4-cyclohexylene rings. It is especially preferred that the groups D and E contain no substitution.
• the groups Z 4 and Z 5 are selected from the group consisting of a single bond, -COO-, -OOC-, -CH 2 -CH 2 -, -CH 2 O-, -OCH 2 -, -CH-CH- and -C ⁇ C-. It is especially preferred that Z 4 and Z 5 represent a single bond, -C ⁇ C-, -COO- or -OOC-.
• Z 6 may be optionally substituted by one or more halogen atoms, preferably one or more fluorine atoms. It is preferred that p has a value of 1 to 11. It is also preferred that Z 6 contains no substitution. It is further preferred that, for the group Z 6 , X is selected from -CH 2 -, -O-, -COO- and -OOC-, especially -CH 2 - or -O-.
• the sum of the two integers m for each of the groups G 1 and G 2 is 0 or 1. It is especially preferred that for both G 1 and G 2 m has a value of 0.
• DEAD is diethyl azodicarboxylate
• TPP is triphenylphospine
• THF is tetrahydrofuran
• Kl is potassium iodide
• DBU is l,8-diazabicyclo[5.4.0]undec-7-ene
• EDC is N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride
• Suitable starting materials used in the preparation of the compounds of the present invention include, amongst others, phenyl and biphenyl alcohol and carboxylic acid compounds as well as 1 ,4-cyclohexanedione.
• the starting materials are commercially available or may be readily prepared and are well known to a skilled person.
• the compounds of the invention are preferably prepared by forming a ring that includes a lateral group prior to linking the mesogenic residues.
• the compounds may be prepared by forming a ring that includes a polymerisable mesogenic residue prior to linking the lateral group.
• a second aspect of the invention therefore provides a method of preparation of a compound of formula (I), the method comprising forming a ring that includes a lateral group and subsequently linking the
• the mesogenic residues G and G are preferably connected to the central ring simultaneously. As indicated above, it is especially
• the compounds of the invention may be used in the preparation of liquid crystalline mixtures. Such mixtures may be prepared by admixing a compound of formula (I) with one or more additional components. An organic solvent may also be used in the preparation of these mixtures.
• a third aspect of the invention therefore provides a liquid crystalline mixture comprising a compound of formula (I) and one or more additional components.
• the one or more additional components present in the liquid crystalline mixture may be further compounds of formula (I), other mesogenic compounds, compounds that are compatible with a mesogenic molecular architecture or chiral dopants for the induction of helical pitch.
• the LCP mixture may also include a suitable organic solvent. Examples of solvents that may be used in the preparation of such liquid crystalline mixtures include anisole, N-methylmorpholine, caprolactone, cyclohexanone, methyl ethyl ketone and the like.
• Examples of additional components that may be used in the preparation of liquid crystalline LCP mixtures according to the third aspect of the invention include those compounds represented by formulae III to X.
• S 3 , S 4 independently represent -(CH 2 ) lake- or -O(CH 2 ) n -;
• E , E are independently selected from the group consisting of 1 ,4-phenylene trans- 1,4-cyclohexylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl and trans 1 ,4-cyclohexylene- 1 ,4-phenylene;
• F , F are independently selected from the group consisting of 1 ,4-phenylene, and 2- or 3-fluoro-l,4-phenylene;
• L 4 , L 5 , L 6 are independently selected from the group consisting of OH, C i -C 2 o-alkyl, C ⁇ -C 2 o-alkenyl, C • -C 2 o-alkoxy,
• Z 7 is selected from the group consisting of -COO-, -OOC-, -OCH 2 -,
• -CH 2 O-, -O(CH 2 ) 3 -, -OOC(CH 2 ) 2 - and -COO(CH 2 ) 3 -; is selected from the group consisting of a single bond, -CH 2 CH 2 -, -CH 2 O-, -OCH 2 -, -COO-, -OOC-, -(CH 2 ) 4 -, -O(CH 2 ) 3 -, (CH 2 ) 3 O- and -C ⁇ C-;
• Z9 y is selected from the group consisting of a single bond, -CH 2 CH 2 -, -CH2O-, -OCH2-, -COO-, -OOC-, and -C ⁇ C-;
• Y is independently selected from the group consisting of hydroxy
• C ⁇ -C 2 o-alkyl C ⁇ -C 2 o-alkenyl, C ⁇ -C 2 o-alkoxy, C ⁇ -C 20 -alkoxycarbonyl, formyl-, C ⁇ -C 2 o-alkylcarbonyl, C ⁇ -C 2 o-alkylcarbonyloxy, fluoro, chloro, bromo, cyano and nitro; n is an integer having a value of from 2 to 20; and v is an integer having a value of from 2 to 12
• the compounds of the invention may also be used in the formation of a LCP layer by casting a LCP compound according to the first aspect of the invention or a mixture according to the third aspect of the invention onto a substrate.
• a fourth aspect of the invention therefore provides a method forming a LCP network comprising forming a LCP layer including a compound of formula (I) and cross-linking the layer.
• Liquid crystalline mixtures according to the third aspect of the invention may also be used in the manufacture of LCP networks in a similar way.
• the invention also includes, in a fifth aspect of the invention, a cross-linked
• LCP network comprising a compound of formula (I) in a cross-linked form.
• Cross-linked LCP networks comprising a mixture according to the third aspect of the invention in cross-linked form may also be included in this aspect of the invention.
• a sixth aspect of the invention provides the use of a compound of formula (I) in the preparation of an optical or an electro-optical device.
• the use, in the preparation of an optical or electro-optical device, of liquid crystalline mixtures according to the third aspect of the invention is also included in this aspect of the invention.
• a seventh aspect of the invention provides an optical or an electro-optical device comprising a compound of formula (I) in a cross-linked state.
• An optical or electro-optical device comprising a LCP liquid crystalline mixture in a cross-linked state according to the third aspect of the invention is also included in this aspect of the invention.

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