- Dielectric materials
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The present invention relates to a novel class of polymers which can be used as dielectric material for the preparation of passivation layers in electronic devices. The polymers are prepared from polymerizable compounds having mesogenic groups and they pr
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Page/Page column 54
(2020/02/20)
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- POLYMERIZABLE LIQUID CRYSTAL COMPOUND, POLYMERIZABLE LIQUID CRYSTAL COMPOSITION, AND LIQUID CRYSTAL POLYMERIZED FILMS
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To provide a polymerizable liquid crystal compound in order to produce a retardation film having excellent front contrast. A polymerizable liquid crystal composition including a compound represented by Formula (1). In Formula (1), for example, W1 is an alkoxycarbonyl group having 1 to 10 carbon atoms, an alkanoyl group having 1 to 10 carbon atoms, or a polymerizable functional group, A1 is independently 1,4-phenylene or naphthalene-2,6-diyl, Z1 is a linking group, m and n are independently an integer of 0 to 7, and satisfy 3≤m+n≤8, and P1 is a polymerizable functional group.
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Paragraph 0312-0315
(2018/05/17)
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- Polymerizable compound, the photopolymerizable composition and the optical anisotropic
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PURPOSE: A polymerizable naphthoic acid phenyl compound is provided to have high reflection anisotropy and high storage stability and high orientation. CONSTITUTION: A polymerizable naphthoic acid phenyl compound is represented by chemical formula 1. In chemical formula 1, one of M^1-M4 is a fluorine atom, a chlorine atom, a cyno group, a nitro group, a C1-7 alkyl group, a C1-7 alkoxy group, or a C1-7 alkanoyl group. L^1-L^6 is hydrogen, fluorine or chloride. A polymerizable liquid composition comprises the polymerizable compound. The polymer is obtained by polymerizing the polymerizable liquid compositions. An optical anisotropic object uses the polymer.
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- Synthesis and characterization of Triad based rigid mesogenic diols derived from Hydroquinone and 4-hydroxybenzoic acid
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Triad based rigid mesogenic diols have been synthesized by four step synthesis method using protection-deprotecti method. Hydroquinone and 4-hydroxy benzoic acid have been used as starting materials. Synthesized diols have be characterized by IR, 1H and 13C NMR, and mass spectroscopic methods. Thermal properties have been determined b thermo gravimetric analysis method and degree of crystallinity have been measured by wide angle X-ray techniqu Substituted hydroquinones (methyl and chloro) have been used to study the effect of substitution on physical and therm properties. Synthesis of rigid mesogenic diol monomer using p-hydroxy benzoic acid and hydroquinone is reported, which a facile route. Hydrolysis of diacetate derivatives of rigid mesogenic diols is performed in good yields, even though tw types of ester groups present in the same moiety, aromatic and aliphatic. The experimental results reveal that hydroquino based rigid triad mesogenic diol have high thermal stability and degree of crystallinity as compared to methyl- and chlor substituted rigid triad mesogenic diols.
- Mulani, Khudbudin B.,Ganjave, Nitin V.,Chavan, Nayaku N.
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p. 591 - 596
(2014/06/23)
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- Mesomorphism and shape-memory behavior of main-chain liquid-crystalline co-elastomers: Modulation by the chemical composition
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The mesomorphic behavior, shape shifting, and shape-memory types of two homologous series of main-chain liquid-crystalline co-elastomers (MC-LCEs) with composition-tunable transition temperatures and mesophases structures are reported. The weakly cross-linked macromolecules were prepared in a one-step procedure by the versatile platinum-catalyzed hydrosilylation reaction between siloxane oligomers (linear spacers and netlike point molecules) and liquid-crystalline binary mixtures, composed of defined proportions of divinylic monomeric mesogens. First, the two sets of alternated, linear copolymers with disiloxane or trisiloxane chain extender, respectively, were investigated. They either exhibit both smectic C (SmC) and nematic (N) phases or a single SmC phase, the nature of which being dictated by the length of the inserted siloxane moieties, and the temperatures ranges regulated by the composition of the mesogenic mixture (mesogens ratio). As anticipated, the thermal behavior of the corresponding co-elastomers is not greatly affected by the weak reticulation (less than 5% w/w), whose transition temperatures (from the ambient to ca. 100 °C) and mesophases types (SmC and N) are quasi-replicated from the polymers and still majority governed by the intermingling of the constitutive components (mesogens ratios, siloxane, and comonomers). Moreover, these MC-LCEs exhibit two types of shape-memory behaviors, which are imposed selectively by the nature of the siloxane extender and which are understood in relation to the mesophases' structures. The combination of small-angle X-ray scattering and thermoelastic experiments gives some fundamental insights into the relationships between molecular structures and macroscopic elastic properties in MC-LCEs in general, which should be beneficial for future designs of soft materials with desired shape-memory properties.
- Garcia-Marquez, Alfonso Ramon,Heinrich, Benoit,Beyer, Nicolas,Guillon, Daniel,Donnio, Bertrand
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p. 5198 - 5210
(2014/09/17)
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- Liquid crystal compositions, polymer networks derived therefrom and process for making the same
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The invention relates to compounds of Formula (I): The invention further relates to liquid crystal compositions comprising compounds of Formula (I); compositions further comprising one or more chiral compounds; and polymer networks derived from the polymerization of the liquid crystal compositions. Another embodiment relates to processes for providing compounds of Formula (I).
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Page/Page column 33-34
(2013/02/28)
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- Additive components for liquid crystalline materials
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The present invention relates to mesogenic, cross-linkable mixtures comprising (i) a cross-linkable liquid crystalline host compound comprising at least one cross-linkable liquid crystalline compound, and (ii) at least one chiral or achiral rod shaped additive component, wherein said additive component has a rigid core and comprises at least two fused or linked, optionally substituted, non-aromatic, aromatic, carbocyclic or heterocyclic groups, and also comprises at least one optionally substituted alkyl residue, and at least one polymerizable group and wherein the additive component has a transition temperature to the isotropic state of 40° C. or lower. The invention also relates to the novel chiral or achiral rod-shaped additive compounds used for the preparation of these mixtures, to mixtures according to the invention in form of an elastomer, polymer gel, polymer network or polymer film, to polymer networks and liquid crystalline polymer films prepared from these mixtures and to optical or electrooptical components comprising polymer networks and liquid crystalline polymer films prepared from such mixtures. Further, the invention relates to the use of the chiral or achiral rod shaped compounds as components of a cross-linkable liquid crystalline mixture in the production of orientated liquid crystalline polymers, to liquid crystalline mixtures comprising these compounds, to liquid crystalline polymers and liquid crystalline polymer networks prepared from such liquid crystalline mixtures, and to liquid crystalline devices comprising these compounds.
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- Vinylsulfone derivative, liquid crystal composition comprising the same and compensation film using the same liquid crystal composition
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Disclosed are a vinylsulfone derivative, a liquid crystal composition comprising the same, and a compensation film for a liquid crystal display device using the same liquid crystal composition. More particularly, the vinylsulfone derivative is a liquid cr
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Page/Page column 21-23
(2011/04/18)
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- CHIRAL COMPOUNDS, LIQUID CRYSTAL COMPOSITIONS AND POLYMER NETWORKS DERIVED THEREFROM
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Isomannide-based compounds having chiral properties are provided, in addition to liquid crystal compositions and polymer networks derived therefrom.
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Page/Page column 32
(2009/04/25)
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- CHIRAL COMPOUNDS, AND LIQUID CRYSTAL COMPOSITIONS AND POLYMER NETWORKS DERIVED THEREFROM
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The invention relates to compounds of formula (I): insert Formula (I) here wherein R1and R2are each independently selected from the group: H, F, Cl and CH3; n1 and n2 are each independently integers 3 to 20; q and r are each independently integers 0, 1 or 2, with the proviso that q + r is ≥ 1; D is a divalent chiral radical selected from the group: (D1-D4) wherein R3 is a C1 to C6 straight or branched chain alkyl group; and each B1and B2 is a divalent radical independently selected from the group: R4-substituted-1,4-phenyl, wherein R4 is H,-CH3 or -OCH3, 2,6-naphthyl; and 4,4'-biphenyl; with the provisos that when q + r = 3, at least one of B1 and B2 is R4-substituted-1,4-phenyl; and when q + r = 4, at least two of B1 and B2 are R4-substituted-1,4-phenyl. The invention further relates to liquid crystal compositions comprising compounds of formula (I) and polymer networks derived from the polymerization of the liquid crystal compositions.
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Page/Page column 23-24
(2008/06/13)
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- Bismaleimides comprising mesogenic groups
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The invention relates to bismaleimides comprising mesogenic groups which consist, corresponding to (I), of two reactive terminal maleimide groups which are linked via linear or singly alkyl-substituted alkylene chains A, which are linked to an aromatic mesogen M via ester, amide or ether groups, wherein A, X, M and R are as defined in the specification. The invention, moreover, relates to oligomeric liquid crystalline bismaleimides of general formula (II) wherein A, X, M and R are as defined above, n represents and integer from 1 to 100 and B represents piperazinyl or a divalent radical which is derived from a primary or secondary para-substituted cyclic diamine, wherein B is bonded via the amino groups of the diamine. The invention also relates to methods of producing said bismaleimides.
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