US20120263936A1 - Device having reduced friction properties - Google Patents

Device having reduced friction properties Download PDF

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Publication number
US20120263936A1
US20120263936A1 US13/453,616 US201213453616A US2012263936A1 US 20120263936 A1 US20120263936 A1 US 20120263936A1 US 201213453616 A US201213453616 A US 201213453616A US 2012263936 A1 US2012263936 A1 US 2012263936A1
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Prior art keywords
approximately
coating
layer
cover panel
cover
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US13/453,616
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English (en)
Inventor
Marta Krzyak
Marten Walther
Peter Kracht
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Schott AG
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Schott AG
Voith Patent GmbH
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Assigned to VOITH PATENT GMBH reassignment VOITH PATENT GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KRACHT, PETER, WALTHER, MARTEN, KRZYZAK, MARTA
Publication of US20120263936A1 publication Critical patent/US20120263936A1/en
Assigned to SCHOTT AG reassignment SCHOTT AG CORRECTIVE ASSIGNMENT TO CORRECT THE ASSIGNEE PREVIOUSLY RECORDED ON REEL 028501 FRAME 0452. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNEE SHOULD READ SCHOTT AG, HATTENBERGSTR. 10, MAINZ, GERMANY 55122. Assignors: KRACHT, PETER, WALTHER, MARTEN, KRZYZAK, MARTA
Priority to US13/777,467 priority Critical patent/US8784933B2/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G02B1/113—Anti-reflection coatings using inorganic layer materials only
    • G02B1/115—Multilayers
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/3411—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of inorganic materials
    • C03C17/3417—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of inorganic materials all coatings being oxide coatings
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/42—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating of an organic material and at least one non-metal coating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
    • C23C18/1204—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material inorganic material, e.g. non-oxide and non-metallic such as sulfides, nitrides based compounds
    • C23C18/1208—Oxides, e.g. ceramics
    • C23C18/1216—Metal oxides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
    • C23C18/1225—Deposition of multilayers of inorganic material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
    • C23C18/125—Process of deposition of the inorganic material
    • C23C18/1254—Sol or sol-gel processing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/40—Coatings comprising at least one inhomogeneous layer
    • C03C2217/425—Coatings comprising at least one inhomogeneous layer consisting of a porous layer
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/70—Properties of coatings
    • C03C2217/73—Anti-reflective coatings with specific characteristics
    • C03C2217/734—Anti-reflective coatings with specific characteristics comprising an alternation of high and low refractive indexes
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/70—Properties of coatings
    • C03C2217/76—Hydrophobic and oleophobic coatings
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2218/00—Methods for coating glass
    • C03C2218/30—Aspects of methods for coating glass not covered above
    • C03C2218/365—Coating different sides of a glass substrate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
    • Y10T428/264—Up to 3 mils
    • Y10T428/265—1 mil or less
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/266—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension of base or substrate

Definitions

  • the present invention relates to a device, in particular to a cover panel for a display device or a monitor front panel or a surface for inputs including a substrate and a coating applied onto the substrate, use of such a device, as well as a method to produce such a device.
  • DE 198 48 591 A1 an optical glass panel has become known which is provided with a fluoro-organic compound.
  • glass panels in particular wind shields, window panes or headlight lenses of vehicles are provided which distinguish themselves through high scratch resistance, reduced air friction, improved sliding of windshield wipers as well as dirt repellence.
  • DE 198 48 591 A1 is restricted to the field of conventional glass panels. In particular the importance of avoiding fingerprints in the field of display panels is not described.
  • a special coating system for a substrate has become known from U.S. Pat. No. 6,472,017 B2 which includes a diamond-like carbon layer and one layer of fluoro-alkyl-silane.
  • the diamond-like carbon layer provides durability and/or hydrophobicity.
  • the fluoro-alkyl-silane layer also serves to provide a high contact angle of the coating system.
  • U.S. Pat. No. 6,472,017 B2 also does not describe avoidance of finger prints.
  • a substrate comprising a sol-gel-layer and a barrier layer as well as an anti-reflective layer has become known.
  • the anti-reflective layer can be applied in the sol-gel-process.
  • the coating described in DE 10 2007 058 927 A1 finds use as an abrasion resistant laminate material in the field of solar cells. Coefficients of friction, in particular values of the initial friction, are not described in DE 10 2007 058 927 A1.
  • DE 39 41 797 A1 a coating system with a high anti-reflective effect for a substrate has become known, whereby the coating is applied with the assistance of chemical vapor deposition (CVD) or reactive sputtering.
  • CVD chemical vapor deposition
  • DE 102 13 036 A1 describes the coating of a synthetic film with a multi-layer interference coating, whereby the multi-layer interference coating can also find use for an anti-reflection system.
  • Neither in DE 30 41 797 A1 nor in DE 102 13 036A1 are coefficients of friction stated for the coating systems.
  • Coated substrates according to those described above often have the problem that the surfaces of these coatings are often very rough in spite of high contact angles. This results in that glass panels, which for example find use in the field of displays, are scratched by ball pens or pens which leads to an unsteady character image and in addition affects the surface. Especially in the use of glass panels in display products which include a touch-panel application, namely a surface whereby through touching of certain areas of the surface the program sequence of a technical device can be directly controlled, the top (glass) surface and its properties is important. However, due to the previously cited problems according to the current state of the art the top glass surface was not able to recognize writing with certainty.
  • the glass surfaces according to the current state of the art were susceptible to contamination for example through finger prints. Therefore, according to the current state of the art, cleaning solutions containing professional and commercial glass cleaning agents had to be used to clean the glass surfaces.
  • the present invention provides a device including a substrate, as well as a coating applied onto the substrate, wherein the coating on the surface exhibits a a coefficient of friction (tan ⁇ ) in the range between approximately 0.01 and 0.12, for example between 0.02 and 0.1, or between 0.03 and 0.09.
  • the coefficient of friction is a coefficient of friction which is determined on a slanted plane which is tilted at an angle ⁇ . Angle ⁇ at which a weight arranged on the plane will slide determines the coefficient of friction.
  • the coefficient of friction according to the current invention is a coefficient of friction of rest or static friction or a starting coefficient of friction, in contrast to the coefficient of sliding friction or dynamic coefficient of friction.
  • the inventive coating ensures that the surface appears smooth, or respectively is smoothed, and that the coefficient of friction of the surface of the substrate is reduced.
  • a surface is provided with a coating according to the present invention, then it is, for example, possible to move an input device on this surface without “scratching” or undesirable “sticking”, as is typically the case, for example, with a pen having a synthetic tip or a finger on normal glass surfaces. Moreover, the adherence of dirt or fingerprints on the surface is substantially reduced, so that dry cleaning of these contaminants on a surface with reduced adhesion is possible. This is especially advantageous with touch-panel applications.
  • the adherence, or respectively sticking of organic substances is substantially reduced or respectively practically completely prevented on a substrate provided with the inventive coating, so that fingerprints are largely avoided or respectively are far less visible. Since the skin oil adheres less or practically not at all on the coating, cleaning of the substrate with an inventive coating is also easier.
  • the contaminations from organic substances or respectively skin oil can even be wiped off dry. This means that, for example on displays or touch screen panels, the obligatory cleaning agents for organic contaminants can be relinquished.
  • the coating includes an anti-reflective coating.
  • the coating including the anti-reflective coating or respectively the anti-reflection coating has, for example, a coefficient of friction (tan ⁇ ) or respectively a static coefficient of friction on the surface in the range of between approximately 0.01 and 0.12, for example between 0.02 and 0.1, or between 0.03 and 0.09.
  • a cover layer applied on the anti-reflective or respectively anti-reflection coating has, for example, a coefficient of friction (tan ⁇ ) or respectively a static coefficient of friction on the surface in the range of between approximately 0.01 and 0.12, for example between 0.02 and 0.1, or between 0.03 and 0.09.
  • the thickness of the cover layer which reduces the coefficient of friction is in the range of between 0.1 nanometers (nm) to 10 nm.
  • the substrate is, for example, a glass panel, such as a soda-lime glass panel or a borosilicate glass panel which is obtained, for example in a draw method, for example up-draw or down-draw method, or in the float technology or from a cast glass or rolled glass.
  • a draw method for example up-draw or down-draw method
  • a cast or roll method it is feasible that the necessary optical quality of the surface may be obtained through a polishing method which is required, for example, for a display front panel.
  • the substrate may alternatively also be a synthetic substrate.
  • the substrate is, for example ⁇ 1 mm thick and is an ultra-thin substrate.
  • Exemplary materials are the ultra-thin glasses D263, B270 or Borofloat by SCHOTT AG.
  • the devices are used for cover panels for displays, optionally also as touch-panels or touch screens, for larger surfaces, for example surfaces larger than 1 square meter (m 2 ), then substrates having a thickness of between approximately 4 to 6 millimeters (mm) are used, so that a mechanical protective function of the displays is also assumed.
  • the panels can be single panels as well as laminated panels.
  • a laminated panel for example includes two panels, a first and a second panel, which are laminated for example with a polyvinyl butyral (PVB) film.
  • PVB polyvinyl butyral
  • the inventive layers have contact angles >approximately 50 degrees, for example >70 degrees.
  • Layers having contact angles >50 degrees, for example >70 degrees allow, in addition to the previously described dry cleaning, simple cleaning of the glass surface from contaminants using liquid cleaning agents such as glass cleaners or water.
  • the reduced adherence mechanism which, for example is distinguished by a low coefficient of friction, is substantially responsible for the good cleanability, in particular dry cleaning of the inventive layers or respectively coatings.
  • the inventive layer or respectively coating however, also has a high contact angle which can even reach more than 100°; however decisive for the dry-cleanability is the low adherence of contaminants, such as organic contaminants on the surface of the coating, and not the high angle of contact.
  • the primary application for the herein described devices with a substrate and a coating applied thereto, having a low coefficient of friction is in the use of a cover panel providing a mechanical protective function and/or a surface for inputs, for example input devices or so-called displays.
  • the device finds use in areas where technical devices can be operated by touching of parts on the surface of the device, namely in the area of touch-panel applications with interactive input. Since a panel of this type also introduces additional interfaces into the total optical system of the display, a reflectivity of approximately 8% is achieved on the display when using only a conventional float glass panel as substrate material without anti-reflective coating. This reflectivity interferes with the effective contrast of the display since reflections compete with the useful signal of the display.
  • an anti-reflective coating or respectively an anti-reflection coating onto the substrate, namely to use a panel provided with an anti-reflective coating, whose reflectivity R VIS clearly reduces in the visible wavelength range at standard light D65 and is, for example lower than approximately 4%, or ⁇ 2%.
  • This glass or synthetic panel then includes an anti-reflective coating which is also referred to as anti-reflection coating and which is applied according to one of the following application methods:
  • an anti-reflective coating is applied, and the anti-reflective coating is provided with a cover layer which has a static coefficient of friction (tan ⁇ ) in the range between approximately 0.01 and 0.12, for example between 0.02 and 0.1, or between 0.03 and 0.09, then the anti-reflective coating is optically adapted to the cover layer, for example through addition of precursor materials or polymers, so that an anti-reflective effect is provided.
  • the anti-reflective effect is such that, with one- or two-sided application the reflectivity of the entire system is between approximately 0.1% and 7%, for example between 0.1% and 6%, between 0.1% and 5.5%, between 0.1% and 4%, between 0.1% and 2%, or between 0.1% and 1.5% in the visible wavelength range at standard light D65.
  • the substrate with coating is used in one of the following areas or for one of the following products:
  • the present invention also provides a method to produce a coating having a coefficient of friction between approximately 0.01 and 0.12, for example between 0.02 and 0.1, or between 0.03 and 0.09 on a substrate which, includes the following steps:
  • the ultra-hydrophobic coating material “Duralon Ultratec” produced by Cotec GmbH., Frankenstra ⁇ e 19, D-63791, Karlstein, Germany can for example, in the form of a tablet (14 mm diameter, 5 mm height) be put into a vaporizer which is located in the aforementioned pressure vessel. From this vaporizer the coating material is then evaporated from the filling of the tablet at temperatures of between approximately 100° C. to 400° C. and precipitates onto the surface of the substrate or onto a previously applied coating, for example onto an anti-reflection coating or respectively anti-reflex coating as a cover layer.
  • a device for general coating of objects is used, as disclosed in EP-A-1816232, the disclosure content of which is incorporated into the current application in its entirety.
  • the time- and temperature profiles are set as provided by Cotec GmbH, FrankenstraBe 19 , D-63791, Karlstein, Germany for evaporation of the “Duralon Ultratec” material tablet.
  • the substrates (non-coated and/or with anti-reflection coating) reach a slightly elevated temperature during the process which is in the range of between approximately 300K to 370K.
  • the previously described application method normally delivers cover layers which are only a few nm thick, generally less than approximately 10 nm thick and, for example, represent only a monomolecular saturation of the surface of the coating or respectively the substrate. If cover layers are applied onto anti-reflective coatings or respectively anti-reflection coatings, the thickness of the coating or the refractive index of the entire system consisting of coating and cover layer changes. In order to continue to receive good anti-reflection, the entire system consisting of anti-reflective coating and cover layer may be adapted.
  • the optical system with an anti-reflection coating only needs to be adjusted slightly with such thin cover layers, in order to achieve the desired tint of the residual reflection of the anti-reflection coating, for example by altering the layer structure.
  • It is known to the expert how admixtures can be added to the process described above which effect for example a layer thickness of higher than approximately 10 nm for the anti-reflection coating.
  • An example which can be mentioned is, that simultaneously with the evaporation of the layer having low static friction, an additional polymer compound which leaves behind a transparent layer may be evaporated. The material to reduce the static friction is then incorporated into this layer and can achieve clear optic effect as a layer of more than approximately 10 nm.
  • the uppermost cover layer including for example, a material having a low coefficient of friction, as well as the last layer adjacent to the cover layer of the anti-reflection system including low refractive material having a refractive index between approximately 1.37 and 1.6 should be considered as a single layer, which is calculated together into the configuration of the anti-reflection system.
  • cover layer diverse materials in addition to the aforementioned polymers can be used as precursors for known CVD processes.
  • FIG. 1 illustrates the principle of measurement to determine the coefficient of friction
  • FIGS. 2 a - 2 b illustrate the device according to the present invention, including a single flat panel as the substrate material ( FIG. 2 a ) and a laminated panel ( FIG. 2 b ).
  • FIG. 1 there is shown the principle of measurement for the coefficient of friction as is the basis for the current invention and as stated in table 1 for various samples.
  • a glass panel to be tested, provided with a coating is brought into a defined slanted position and is moved through movable stop 14 over the edge of block 12 , having a height a in direction 15 so that the angle of the slant, angle ⁇ becomes increasingly larger.
  • distance b between support point 17 and block 12 changes, thereby changing angle ⁇ .
  • the height of block 14 is 15 mm.
  • angle ⁇ The following equation applies to angle ⁇ :
  • Weight 20 resting on the pane starts to slide with increasing angle ⁇ .
  • the angle at which weight 20 starts to slide on the glass pane is then the measure for the coefficient of friction according to the present invention.
  • the coefficient of friction according to the present invention is hereby the coefficient of friction of rest, or starting coefficient of friction or a coefficient of static friction.
  • As weight 20 a “Delrin” (POM) cuboid measuring 20 ⁇ 20 ⁇ 10 mm with applied brass piece and a total weight of 106 g is, for example used.
  • Angle ⁇ can be determined very simply from distances b and a, as described above. At fixed height ⁇ and determination of length b at which the block starts to slide, angle ⁇ which is consistent with the coefficient of friction, in this case the coefficient of static friction, can be determined.
  • the anti-reflection coating was produced according to the sol-gel method.
  • the coating includes three individual layers respectively and possesses the following structure: Substrate+M+T+S.
  • the individual layer identified with T contains titanium dioxide (TiO 2 ).
  • the individual layer identified with S contains silicon dioxide (SiO 2 ) and the individual layer identified with M is always drawn from S and T mixed solutions.
  • the float glass substrate is carefully cleaned prior to coating.
  • the dipping solutions are respectively applied in rooms which are air-conditioned to approximately 28° C. at a humidity of 5 to 10 grams per kilogram (g/kg), whereby the draw speeds for each individual layer M/T/S are approximately 275/330/228 millimeters per minute (mm/min). Drawing of each gel layer is followed by a curing process in air.
  • the curing temperature and the curing time are approximately 180° C./ 20 min after production of the first gel layer, as well as approximately 440° C./60 meter (m) after production of the second and third gel layer.
  • the dipping solution per liter includes the following: approximately 68 milliliters (ml) titanium-M-butylate, approximately 918 ml ethanol (ABS), approximately 5 ml acetyl acetone and approximately 9 ml ethyl-butyl-acetate.
  • the dipping solution to produce the S-layer includes: approximately 125 ml silicic acid methyl ester, approximately 400 ml ethanol (ABS), approximately 75 ml H 2 O (distilled), approximately 7.5 ml acetic acid and is diluted with approximately 393 ml ethanol (ABS) after a rest period of approximately 12 hours.
  • the coating solutions to produce the oxides with the medium refractive index are prepared by mixing of the S+T solutions.
  • the layer identified with M is drawn from a dipping solution having a silicon dioxide content of approximately 5.5 grams per liter (g/l) and a titanium dioxide content of approximately 2.8 g/l.
  • the applied wet-chemical sol-gel process permits economic dip-coating of large areas.
  • anti-reflection coatings can also be applied with the assistance of sputtering processes.
  • Such a coated system is shown below.
  • the example-sample 2 is a one-sided anti-reflection coating which is applied as follows in the sputtering process:
  • the coating is deposited in an inline unit in a mid-frequency (MF) sputtering process through magnetron sputtering, whereby the substrate is positioned on a so-called carrier and is transported on same through the sputtering unit.
  • MF mid-frequency
  • the application method is as follows:
  • layers which are coated according to example sample 1 can be coated with ETC (easy to clean) layers.
  • a layer according to sample 1 is pre-cleaned in a washing machine and pre-treated with a neutralizer so that the coating is fat free.
  • the thus cleaned surface is sprayed with the product ClearShield which is offered commercially for example by Fa. Bohle in Haan (Germany) and which represents a typical fluoro-polymer solution for ETC (Easy To Clean) applications.
  • the surface sprayed with ClearShield is left to react at room temperature for approximately 10 to 15 minutes.
  • the coated surface is then washed and dried.
  • ETC Easy to clean
  • ClearShield layer the contact angle can be substantially improved compared to untreated samples, as in sample 1 or 2.
  • an increase of the contact angle by 23 or respectively 46 degrees in sample 1 or respectively sample 2 to 78 degrees in sample 3 does not mean that the respective coefficient of friction is achieved and that therefore a finger or pen can glide more easily over the surface or that a dry cleaning is made possible.
  • the coating cited in sample 4 is again a coating in accordance with sample 1 which is subjected to a secondary treatment.
  • the coating according to sample 1 is after-treated in a process with vacuum.
  • the coated glasses according to sample 1 are brought into a pressure vessel which is subsequently evacuated with low vacuum.
  • the ultra-hydrophobic coating material “Duralon Ultratec” produced by Cotec GmbH., Frankenstra ⁇ e 19, D-63791, Karlstein, Germany can for example, in the form of a tablet (14 mm diameter, 5 mm height) be put into a vaporizer which is located in the aforementioned pressure vessel. From this vaporizer the coating material is then evaporated from the filling of the tablet at temperatures of between approximately 100° C. to 400° C. and precipitates onto the surface of the substrate or onto a previously applied coating, for example onto an anti-reflection coating as a cover layer.
  • a device for general coating of objects is used, as disclosed in EP-A-1816232, the disclosure content of which is incorporated into the current application in its entirety.
  • the time- and temperature profiles are set as provided by Cotec GmbH, Frankenstra ⁇ e 19, D-63791, Karlstein, Germany for evaporation of the “Duralon Ultratec” material tablet.
  • the substrates (non-coated and/or with anti-reflection coating) reach a slightly elevated temperature during the process which is in the range of between approximately 300K to 370K.
  • a coefficient of friction or respectively a coefficient of static friction of tan ⁇ 0.07, which is in the range of between approximately 0.01 to 0.12, is achieved.
  • the angle of contact for sample 4 is high, namely more than 100 degrees.
  • a coefficient of friction or respectively a coefficient of static friction of 0.07, namely of between approximately 0.01 and 0.12 is achieved, whereas the samples which were not treated with an additional cover layer—sample 1 through sample 3—have coefficients of friction or respectively coefficients of static friction of approximately 0.16 through 0.2.
  • the coefficients of friction or respectively the coefficients of static friction were, as described above, determined through determination of tan( ⁇ ) by moving the glass pane over a block having height a of, for example, approximately 15 mm.
  • the illustrated layer system according to FIG. 2 includes substrate 100 in the form of a single panel as well as coating 110 applied onto one side 114 . 1 , including anti-reflection coating 121 . 1 onto which in the current example also cover layer 122 is applied as in example 4 (sample 4).
  • Cover layer 122 has a coefficient of friction in the range of between approximately 0.01 to 0.12, for example between approximately 0.02 and 0.1, or between approximately 0.03 and 0.09 on outward facing surface 112 . This results in that a finger or pen can glide more easily over the surface of such a sample, which is advantageous in particular in applications in the field of touchscreens or displays.
  • second anti-reflection layer 121 . 2 may be provided in such a manner that a very low reflectivity of R VIS ⁇ approximately 4%, for example ⁇ 2% is achieved.
  • reflectivity R VIS >0.2%. This means that the reflectivity R VIS in the visible wavelength range at standard light D65 for the entire system is in the range between approximately 4% and 0.2%, for example between approximately 2% and 0.2%.
  • the anti-reflection coating is often also referred to as anti-reflective coating.
  • the substrate is, for example, a single glass panel, such as a soda-lime glass panel or a borosilicate glass panel which is obtained, for example, in a draw method, for example an up-draw or down-draw method or in the float technology or from a cast glass or rolled glass.
  • a draw method for example an up-draw or down-draw method or in the float technology or from a cast glass or rolled glass.
  • the necessary optical quality of the surface is obtained through a polishing method which is required, for example, for a display front panel.
  • Substrate 100 includes as laminated panel 205 first panel 2101 . 1 and second panel 210 . 2 .
  • First and second panel 210 . 1 , 210 . 2 are laminated to a lamination using film 211 , for example a polyvinyl butyral (PVB) film.
  • film 211 for example a polyvinyl butyral (PVB) film.
  • At least one outward facing surface 212 . 1 and 212 . 2 of first panel 210 . 1 or respectively second panel 210 . 2 includes cover layer 122 having a low coefficient of friction, namely a low static coefficient of friction.
  • coating 110 including first anti-reflection coating 121 . 1 and cover layer 122 is applied onto surface 212 . 1 of first panel 210 . 1 .
  • second anti-reflection coating 121 . 2 is also provided in order to achieve very low reflectivity R vis in the entire system.
  • the substrate may alternatively also be a synthetic substrate.
  • the substrate may be ⁇ approximately 1 mm thick and is, for example an ultra-thin substrate.
  • the ultra-thin glasses D263, B270 or Borofloat by SCHOTT AG.
  • the devices are used for display glasses for larger surfaces, for example surfaces larger than 1 meter squared (m 2 ), then substrates having a thickness of approximately 3 to 6 mm are used.
  • additional components are to be mounted on the inventive described substrate, which are used typically as display covers.
  • inventive described substrate which are used typically as display covers.
  • back-mounted support systems for example of metal or front-mounted optical docking systems.
  • Standard procedure is to mount these elements through adhesion. Since the described layers with low coefficient of friction also have poor adhesion for bonded joints it is advantageous in these cases to exclude the regions which are to be glued together from the described coating process. The relevant region can be masked for this purpose, for example using an adhesion film, or also strippable lacquer in screen printing technology.
  • This masking has the effect that the layer formation toward the surface of the substrate with overlying anti-reflection coating is prevented and the gluing process onto partial regions is implemented, which does not meet the requirement that the coefficient of friction is very low.
  • the masked regions are then, for example, positioned in segments of the substrate which are not visible in its application; this would for example be a housing cover.

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  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Metallurgy (AREA)
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  • Geochemistry & Mineralogy (AREA)
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  • Dispersion Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Surface Treatment Of Glass (AREA)
  • Laminated Bodies (AREA)
  • Surface Treatment Of Optical Elements (AREA)
US13/453,616 2009-10-23 2012-04-23 Device having reduced friction properties Abandoned US20120263936A1 (en)

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US20140150997A1 (en) * 2012-11-30 2014-06-05 Industrial Technology Research Institute Heat pipe and processing method thereof
US20140353602A1 (en) * 2013-06-04 2014-12-04 Samsung Display Co., Ltd. Display panel and a method of manufacturing the same
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USD785613S1 (en) 2014-01-29 2017-05-02 Htc Corporation Case for a portable electronic device
US9760193B2 (en) * 2014-02-28 2017-09-12 Tpk Touch Solutions (Xiamen) Inc. Composite substrate structure and touch panel having the same
US20150248140A1 (en) * 2014-02-28 2015-09-03 Tpk Touch Solutions (Xiamen) Inc. Composite substrate structure and touch panel having the same
US10152149B2 (en) * 2014-02-28 2018-12-11 Tpk Touch Solutions (Xiamen) Inc. Composite substrate structure and touch panel having the same
US20150248182A1 (en) * 2014-02-28 2015-09-03 Tpk Touch Solutions (Xiamen) Inc. Composite substrate structure and touch panel having the same
DE102015102216B4 (de) 2014-02-28 2022-10-13 Tpk Touch Solutions (Xiamen) Inc. Verbindungs-Substratstruktur und Touchscreen, das sie aufweist
WO2020129526A1 (ja) * 2018-12-20 2020-06-25 日本電気硝子株式会社 電子デバイスの製造方法及びガラス基板
US20220206615A1 (en) * 2020-12-30 2022-06-30 Lg Display Co., Ltd. Touch Panel and Touch Display Device Comprising the Same
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WO2011047840A2 (de) 2011-04-28
US8784933B2 (en) 2014-07-22
KR20120083436A (ko) 2012-07-25
KR101577248B1 (ko) 2015-12-14
DE102009050568A1 (de) 2011-04-28
CN102770219A (zh) 2012-11-07
EP2490828A2 (de) 2012-08-29
WO2011047840A3 (de) 2011-07-28
DE202009015376U1 (de) 2011-03-03
CN102770219B (zh) 2014-11-26
US20130171344A1 (en) 2013-07-04

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