WO1998014528A1 - Flächengebilde mit cholesterisch, flüssigkristalliner ordnungsstruktur - Google Patents
Flächengebilde mit cholesterisch, flüssigkristalliner ordnungsstruktur Download PDFInfo
- Publication number
- WO1998014528A1 WO1998014528A1 PCT/EP1997/005031 EP9705031W WO9814528A1 WO 1998014528 A1 WO1998014528 A1 WO 1998014528A1 EP 9705031 W EP9705031 W EP 9705031W WO 9814528 A1 WO9814528 A1 WO 9814528A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- nematic
- crystalline
- liquid
- mixtures
- chiral
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- 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
- C09K19/38—Polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/02—Liquid crystal materials characterised by optical, electrical or physical properties of the components, in general
Definitions
- liquid-crystalline phases can occur during heating.
- the individual phases differ by the spatial arrangement of the molecular centers on the one hand and by the molecular arrangement with regard to the longitudinal axes on the other hand (GW Gray, PA Winsor, Liquid Crystals and Plastic Crystals, Ellis Horwood Limited, Chichester 1974).
- the nematic liquid-crystalline phase is characterized by the fact that only a long-distance order exists due to the parallel storage of the longitudinal axes of the molecules.
- a so-called cholesteric phase is formed in which the longitudinal axes of the molecules form a helical superstructure perpendicular to them (H. Baessler, Fest redesigniprobrome XI, 1971).
- the chiral part of the molecule can either be present in the liquid-crystalline molecule itself or be added to the nematic phase as a dopant, the cholesteric phase being induced.
- This phenomenon was first studied on cholesterol derivatives (eg H. Baeßler, MM Labes, J. Chem Phys, 52, 631 (1970);... H. Baeßler, TM Laronge, MM Labes, J.
- the cholesteric phase has remarkable optical properties: high optical rotation and a pronounced circular dichroism, which arises through selective reflection of circularly polarized light within the cholesteric layer.
- the colors which appear different depending on the viewing angle, depend on the pitch of the helical superstructure, which in turn depends on the twisting power of the chiral component.
- the pitch and thus the wavelength range of the selectively reflected light of a cholesteric layer can be varied by changing the concentration of a chiral dopant.
- Such cholesteric systems offer interesting possibilities for practical use.
- chiral parts of the molecule By incorporating chiral parts of the molecule into mesogenic acrylic acid esters and orientation in the cholesteric phase, for example after photocrosslinking, a stable, colored network can be produced, the concentration of chiral components of which cannot then be changed (G. Galli, M. Laus, A. Angelon, Makromol. Chemie, 187, 289 (1986)).
- non-crosslinkable chiral compounds By adding non-crosslinkable chiral compounds to nematic acrylic acid esters, a colored polymer can be produced by photocrosslinking, which still contains high proportions of soluble components (I. Heyndricks, DJ Broer, Mol. Cryst. Liq. Cryst. 203, 113 (1991)) .
- a cholesteric network can be obtained in which the chiral component can have a share of up to 50% of the material used; however, these polymers still contain significant amounts of soluble fractions (FH Kreuzer, R. Maurer, Ch. Müller -Rees, J. Stohrer, Lecture No. 7, 22nd Freiburg Working Conference on Liquid Crystals, Freiburg, 1993).
- the application DE-OS-35 35 547 describes a method in which a mixture of cholesterol-containing monoacrylates can be processed into cholesteric layers by means of photo-crosslinking.
- the total proportion of the chiral component in the mixture is approximately 94%.
- a pure side chain polymer such a material is not mechanically very stable, but an increase in stability can be achieved by highly crosslinking diluents.
- smectic networks are also known, which are produced in particular by photopolymerization / photocrosslinking of smectically liquid-crystalline materials in the smectically liquid-crystalline phase.
- the materials used for this are generally symmetrical, liquid-crystalline bisacrylates, such as those used by DJ Broer and RAM Hikmet, Makromol. , 190, 3201-3215 (1989). However, these materials have very high clarification temperatures of> 120 ° C., so that there is a risk of thermal polymerization.
- piezoelectric properties can be achieved when an S c phase is present (RAM Hikmet, Macro-molecules 25_, p. 5759, 1992).
- the invention now relates to sheet-like structures obtainable by thermal hardening and having crosslinked cholesteric liquid-crystalline structure.
- the sheetlike structures according to the invention have a superstructure as they have cholesteric liquid crystals.
- the superstructure either exists before the network or it forms during the network. It is created
- Suitable chiral compounds are e.g. the compounds described in German patent application P 19520660.6, of which those according to claim 5 are to be emphasized. These are compounds of the general structure
- R is hydrogen or C - alkyl groups
- X is a radical of the formula
- L independently of one another represent -CC alkyl or alkoxy, halogen, -CO-OR, -O-CO-R, -CO-NH-R or -NH-CO-R and
- the radicals Z, Y 1 , Y 2 , Y 3 , A and M, since they are contained n times in I, can be the same or different.
- the nematic liquid-crystalline compounds should have a sufficiently large phase width.
- Liquid crystals are desirable for lowering the crystallization temperature or increasing the clearing point.
- the temperature at which the hardening is carried out should be as low as possible; the range between 80 and 200 ° C., preferably 80 to 130 ° C., is favorable.
- the following compounds, which largely meet these criteria, are mentioned as examples:
- amines are used to harden components A and B, which are added in a stoichiometric amount. It is advantageous to use structurally similar amines, preferably diamines, for example
- the overall system must be coordinated with one another in such a way that a liquid-crystalline system is formed or is retained during curing.
- cyanates and isocyanates do not require any additional components for curing.
- the fabrics according to the invention are suitable e.g. for decorative coatings, for the production of security features, pigmentary particles, polarizers, color filters and IR reflectors.
- the starting products for the fabrics according to the invention are expediently mixed with cooling and preferably in dissolved form until homogeneous and then freed from the solvent.
- cooling preferably in dissolved form until homogeneous and then freed from the solvent.
- removal of the solvent or solvents by freeze-drying can be appropriate.
- the conditions for mixing and drying depend on the system and must be selected accordingly.
- Suitable solvents should be light-bodied and must have good solvent power for the components.
- ketones, lactones, esters, ethers, hydrocarbons or halogenated hydrocarbons such as acetone, methyl ethyl ketone, butyrolactone, methyl, ethyl or butyl acetate, diethyl ether, dioxane, tetrahydrofuran, methyl t-butyl ether, Toluene, methylene chloride or chloroform can be called.
- the mixing ratio of nematic component (potentially nematic component) / chiral component depends on the intended use of the fabrics according to the invention. In particular, the color is determined by the chiral component, since it is determined by the component itself and its helical twisting power. Corresponding information is contained in the examples.
- the individual components are dissolved in a solvent suitable for freeze-drying, here preferably dioxane.
- concentrations of the monomers are between 0.005 to 0.01 mol / 1.
- the corresponding parts by volume are mixed from these stock solutions, shock-frozen and then freeze-dried.
- Composition Melting temperature Clarifying temperature [Mol% A] [Mol% B] [° C] [° C]
- Mixtures of A and B are used for the experiments, to which 1 is added so that aquimolar ratios of the reactive groups are obtained.
- the mixtures are also made up in solution.
- the mixtures are heated in a microscope at a heating rate of 10 ° C / mm and the microscopic image is observed.
- the melting and glass temperatures are obtained from DSC (differential scan ing calorimetry) investigations.
- Hardness isotropically means that no liquid-crystalline phase is observed under the selected conditions.
- Hardened in two phases means that an isotropic and a liquid-crystalline phase occur side by side under the selected conditions.
- Hardness nematic means that only a liquid crystalline phase is formed.
- a and B are used for the experiments, which are doped with chiral component II.
- the amine component (verb. 1 or 2) is added in an amount such that the molar ratio of the epoxy and amine groups is 2: 1.
- the mixtures are also made up in solution. To determine the data, the mixtures are heated in a microscope at a heating rate of 10 ° C./min and the microscopic image is observed. The melting and glass transition temperatures are obtained from DSC studies. Table 4
- the mixtures are prepared via solutions as described in the general instructions.
- the thermal data are recorded using DSC. All mixtures form nematic liquid-crystalline phases.
- the mixtures are prepared via solutions as described in the general instructions.
- the thermal data are recorded using DSC. All mixtures form a cholesteric liquid crystalline phase.
Landscapes
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Liquid Crystal Substances (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Liquid Crystal (AREA)
Abstract
Description
Claims
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE59708840T DE59708840D1 (de) | 1996-10-01 | 1997-09-15 | Flächengebilde mit cholesterisch, flüssigkristalliner ordnungsstruktur |
| JP51617298A JP3808105B2 (ja) | 1996-10-01 | 1997-09-15 | コレステリック液晶構造を有するシート状構造体 |
| US09/269,203 US6597426B1 (en) | 1996-10-01 | 1997-09-15 | Flat element with a cholesteric liquid crystal structure |
| EP97942927A EP0951520B2 (de) | 1996-10-01 | 1997-09-15 | Flächengebilde mit cholesterisch, flüssigkristalliner ordnungsstruktur |
| AU44585/97A AU741808B2 (en) | 1996-10-01 | 1997-09-15 | Flat element with a cholesteric liquid crystal structure |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19640619.6 | 1996-10-01 | ||
| DE19640619A DE19640619A1 (de) | 1996-10-01 | 1996-10-01 | Flächengebilde mit cholesterisch, flüssigkristalliner Ordnungsstruktur |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1998014528A1 true WO1998014528A1 (de) | 1998-04-09 |
Family
ID=7807656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP1997/005031 Ceased WO1998014528A1 (de) | 1996-10-01 | 1997-09-15 | Flächengebilde mit cholesterisch, flüssigkristalliner ordnungsstruktur |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6597426B1 (de) |
| EP (1) | EP0951520B2 (de) |
| JP (1) | JP3808105B2 (de) |
| AU (1) | AU741808B2 (de) |
| DE (2) | DE19640619A1 (de) |
| WO (1) | WO1998014528A1 (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999019267A1 (de) * | 1997-10-15 | 1999-04-22 | Basf Aktiengesellschaft | Wärmeisolationsbeschichtung |
| JP2004523798A (ja) * | 2001-02-22 | 2004-08-05 | スリーエム イノベイティブ プロパティズ カンパニー | コレステリック液晶材料を含有する光学体およびその製造方法 |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6535268B1 (en) * | 1995-10-30 | 2003-03-18 | Reveo, Inc. | Multilayer non metallic reflecting flakes for cosmetics and sunscreens |
| JP4617838B2 (ja) * | 2003-12-25 | 2011-01-26 | チッソ株式会社 | 液晶性(メタ)アクリレート誘導体およびそれらを含む組成物 |
| US7527746B2 (en) | 2005-01-28 | 2009-05-05 | Chisso Corporation | Liquid crystal polyfunctional acrylate derivative and polymer thereof |
| UA99486C2 (uk) * | 2007-10-09 | 2012-08-27 | Сікпа Холдінг Са | Пристрій для автентифікації захисного мічення |
| US8372943B2 (en) | 2010-12-10 | 2013-02-12 | Sabic Innovative Plastics Ip B.V. | Isosorbide—containing polycarbonates and their preparation |
| JP5962945B2 (ja) * | 2011-10-21 | 2016-08-03 | Dic株式会社 | 重合性キラル化合物 |
| JP6827645B2 (ja) * | 2016-11-02 | 2021-02-10 | 三菱瓦斯化学株式会社 | シアン酸エステル化合物、シアン酸エステル化合物の製造方法、樹脂組成物、硬化物、単層樹脂シート、積層樹脂シート、プリプレグ、金属箔張積層板、プリント配線板、封止用材料、繊維強化複合材料及び接着剤 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01207328A (ja) * | 1988-02-16 | 1989-08-21 | Asahi Glass Co Ltd | コレステリック高分子液晶フイルム、積層コレステリック高分子液晶フイルム及びその製造方法及びそれを用いた窓 |
| DE4342280A1 (de) * | 1993-12-11 | 1995-06-14 | Basf Ag | Polymerisierbare chirale Verbindungen und deren Verwendung |
| EP0747382A1 (de) * | 1995-06-09 | 1996-12-11 | BASF Aktiengesellschaft | Polymerisierbare chirale Verbindungen und deren Verwendung |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2572813A1 (fr) | 1984-11-07 | 1986-05-09 | Armstrong World Ind Inc | Procede pour preparer des revetements liquides polymeres presentant des reponses optiques multiples et revetements ainsi obtenus |
| EP0591508B2 (de) † | 1992-04-27 | 2003-01-15 | MERCK PATENT GmbH | Elektrooptisches fluessigkristallsystem |
| DE19504224A1 (de) † | 1994-02-23 | 1995-08-24 | Merck Patent Gmbh | Flüssigkristallines Material |
| DE4416191A1 (de) * | 1994-05-06 | 1995-11-09 | Consortium Elektrochem Ind | Interferenzpigmente aus in cholesterischer Anordnung fixierten Molekülen sowie deren Verwendung |
| DE4441651A1 (de) * | 1994-11-23 | 1996-04-25 | Basf Ag | Verfahren zur oberflächlichen Beschichtung von Substraten |
| EP0794991B1 (de) † | 1994-12-03 | 2000-11-08 | MERCK PATENT GmbH | Cholesterisches polymernetzwerk |
| DE69739229D1 (de) † | 1996-03-19 | 2009-03-12 | Merck Patent Gmbh | Reflektiver Polarisator, damit ausgestattete Flüssigkristallanzeigevorrichtung und Materialzusammensetzung dafür |
-
1996
- 1996-10-01 DE DE19640619A patent/DE19640619A1/de not_active Withdrawn
-
1997
- 1997-09-15 JP JP51617298A patent/JP3808105B2/ja not_active Expired - Fee Related
- 1997-09-15 US US09/269,203 patent/US6597426B1/en not_active Expired - Fee Related
- 1997-09-15 EP EP97942927A patent/EP0951520B2/de not_active Expired - Lifetime
- 1997-09-15 DE DE59708840T patent/DE59708840D1/de not_active Expired - Lifetime
- 1997-09-15 AU AU44585/97A patent/AU741808B2/en not_active Ceased
- 1997-09-15 WO PCT/EP1997/005031 patent/WO1998014528A1/de not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01207328A (ja) * | 1988-02-16 | 1989-08-21 | Asahi Glass Co Ltd | コレステリック高分子液晶フイルム、積層コレステリック高分子液晶フイルム及びその製造方法及びそれを用いた窓 |
| DE4342280A1 (de) * | 1993-12-11 | 1995-06-14 | Basf Ag | Polymerisierbare chirale Verbindungen und deren Verwendung |
| EP0747382A1 (de) * | 1995-06-09 | 1996-12-11 | BASF Aktiengesellschaft | Polymerisierbare chirale Verbindungen und deren Verwendung |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 013, no. 515 (C - 655) 17 November 1989 (1989-11-17) * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999019267A1 (de) * | 1997-10-15 | 1999-04-22 | Basf Aktiengesellschaft | Wärmeisolationsbeschichtung |
| JP2004523798A (ja) * | 2001-02-22 | 2004-08-05 | スリーエム イノベイティブ プロパティズ カンパニー | コレステリック液晶材料を含有する光学体およびその製造方法 |
| KR100862110B1 (ko) * | 2001-02-22 | 2008-10-09 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | 콜레스테릭 액정 물질을 함유하는 광학체 및 제조 방법 |
| KR100906834B1 (ko) | 2001-02-22 | 2009-07-08 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | 콜레스테릭 액정 물질을 함유하는 광학체 및 제조 방법 |
| JP4763224B2 (ja) * | 2001-02-22 | 2011-08-31 | スリーエム イノベイティブ プロパティズ カンパニー | コレステリック液晶材料を含有する光学体およびその製造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3808105B2 (ja) | 2006-08-09 |
| EP0951520B1 (de) | 2002-11-27 |
| AU741808B2 (en) | 2001-12-13 |
| EP0951520A1 (de) | 1999-10-27 |
| DE59708840D1 (de) | 2003-01-09 |
| JP2001503454A (ja) | 2001-03-13 |
| EP0951520B2 (de) | 2006-08-02 |
| AU4458597A (en) | 1998-04-24 |
| US6597426B1 (en) | 2003-07-22 |
| DE19640619A1 (de) | 1998-04-02 |
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