| Glass for covering electrode -> Monitor Keywords |
|
|
  Glass for covering electrodeUSPTO Application #: 20070032364Title: Glass for covering electrode Abstract: Provided is a nonlead glass for covering an electrode, which comprises, in mol%, B2O3 15-65%, SiO2 2-38%, MgO 2-30%, MgO+CaO+SrO+BaO 5-45%, Li2O 1-15%, Li2O+Na2O+K2O 2-25% and others, and which comprises ZnO 0-15%. Provided is a nonlead glass for covering an electrode, which comprises, in mol %, B2O3 25-65%, SiO2 2-38%, MgO 2-30%, MgO+CaO+SrO+BaO 5-45%, Li2O+Na2O+K2O 2-25%, Al2O3 0-30, TiO 0-10% and ZnO 0-15%. (end of abstract) Agent: C. Irvin Mcclelland Oblon, Spivak, Mcclelland, Maier & Neustadt, P.C. - Alexandria, VA, US Inventors: Hitoshi Onoda, Yu Goshima, Yumiko Aoki USPTO Applicaton #: 20070032364 - Class: 501015000 (USPTO) Related Patent Categories: Compositions: Ceramic, Ceramic Compositions, Glass Compositions, Compositions Containing Glass Other Than Those Wherein Glass Is A Bonding Agent, Or Glass Batch Forming Compositions, Enamels, Glazes, Or Fusion Seals (e.g., Raw, Fritted, Or Calcined Ingredients), Fusion Seals (frit Plus Material Other Than Glass) The Patent Description & Claims data below is from USPTO Patent Application 20070032364. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to an electrode-covering glass suitable for insulating covering of electrodes in cases where a transparent electrode of ITO (indium oxide doped with tin), tin oxide, or the like is formed on a glass substrate, or where a Cr--Cu--Cr electrode or an Ag electrode is formed on a part of a surface of the transparent electrode. BACKGROUND ART [0002] A plasma display panel (PDP) device is a representative large-screen full-color display device. A plurality of display electrode pairs for inducing surface discharge are formed on a display-side substrate (front substrate) of the PDP, while address electrodes perpendicular to the display electrode pairs, stripe-shaped barrier ribs and fluorescent layers covering them are formed on a back-side substrate (back substrate). [0003] The PDP is driven as follows. Namely, a large voltage is applied to a display electrode pair to reset, and discharge is induced between one of the display electrode pair and the corresponding address electrode. By utilizing a wall charge generated by the discharge, a sustaining voltage is applied between the display electrode pair to cause sustaining discharge. [0004] This display electrode pair is used as scanning electrodes for plasma discharge, and a transparent dielectric layer, typically, with a thickness of from 20 to 30 .mu.m is formed thereon for sustainment of discharge. [0005] Each of the scanning electrodes is normally composed of a transparent electrode of ITO or the like and a bus electrodes such as a Cr--Cu--Cr electrode and an Ag electrode formed on a part of a surface of the transparent electrode. [0006] A low melting-point glass containing PbO has been used for the transparent dielectric layer, but electrode-covering low melting-point glasses containing no PbO were recently proposed (cf. JP-A-2004-146357 and JP-A-2001-195989). [0007] JP-A-2004-146357 proposed nonlead glasses containing, in mass%, BaO 3-25%, ZnO 25-60%, B.sub.2O.sub.3 15-35%, SiO.sub.2 3-30%, Li.sub.2O 0.2-6% and Al.sub.2O.sub.3 0-1.5% for the purpose of making bubbles less likely to remain in the dielectric layer and preventing large bubbles from remaining near the electrode. [0008] JP-A-2001-195989 proposed nonlead glasses containing ZnO and an alkali metal oxide of at most 10% by weight and having a low permittivity for the purpose of avoiding increase of power consumption even in a larger-sized screen and higher resolution. DISCLOSURE OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION [0009] The glasses proposed in JP-A-2004-146357 are described as those in which when they cover an Ag electrode, large bubbles are less likely to remain near the electrode, but crystals are likely to precipitate when they are calcined (glasses in Examples 44 and 45 described below). [0010] The glasses proposed in JP-A-2001-195989 are described as those that have a low permittivity and a low softening point, and that are resistant to yellowing of the dielectric layer due to the Ag electrode. However, when the resistivity (.rho.) at 150.degree. C. was measured for glasses expected to reduce the number of bubbles remaining near the electrode in use for covering the Cr--Cu--Cr electrode, most of them had p as low as less than 10.sup.12 .OMEGA.cm, and thus they were not necessarily said to be excellent in the insulating properties (glasses in Examples 46, 48 to 53 described below). Furthermore, the glasses with p of at least 10.sup.12 .OMEGA.cm among the above glasses were subjected to calcination in the form of powder and at a temperature (575.degree. C.) described in the publication, but they did not soften and flow, and hardly calcined (a glass in Example 47 described below). [0011] An object of the present invention is to provide a glass for covering an electrode which can solve the above problems. MEANS FOR SOLVING THE PROBLEM [0012] The present invention provides a glass for covering an electrode, the glass consisting essentially, in mol % based on oxides below, of B.sub.2O.sub.3 15-65%, SiO.sub.2 2-38%, MgO 2-30%, MgO+CaO+SrO+BaO 5-45%, Li.sub.2O 1-15%, Li.sub.2O+Na.sub.2O+K.sub.2O 2-25%, Al.sub.2O.sub.3 0-30% and P.sub.2O.sub.5 0-15%, wherein if ZnO is contained, a content of ZnO is at most 15 mol %, and wherein no PbO is contained (Glass 1 of the present invention). [0013] Furthermore, the present invention provides a glass for covering an electrode, the glass consisting essentially, in mol % based on oxides below, of B.sub.2O.sub.3 25-65%, SiO.sub.2 2-38%, MgO 2-30%, MgO+CaO+SrO+BaO 5-45%, Li.sub.2O 1-15%, Li.sub.2O+Na.sub.2O+K.sub.2O 2-25%, Al.sub.2O.sub.3 0-30%, TiO.sub.2 0-10% and ZnO 0-15%, wherein no PbO is contained (Glass 2 of the present invention). [0014] The inventor of the present invention found that in a B.sub.2O.sub.3--SiO.sub.2--RO--R.sub.2O type electrode-covering glass (RO represents an alkaline earth metal oxide and R.sub.2O represents an alkali metal oxide), to reduce the content of ZnO or to eliminate ZnO is effective for solving the problem that large bubbles remain near the electrode, among the above problems, and thereby accomplished the present invention. EFFECTS OF THE PRESENT INVENTION [0015] When the glass for covering an electrode according to the present invention (hereinafter, referred to as "the glass of the present invention") is used to cover the electrodes on the front substrate of PDP, the number of large bubbles is reduced in the electrode-covering glass layer (transparent dielectric layer) on the front substrate of PDP. This effect is remarkable, particularly, in cases where the Cr--Cu--Cr electrode as described above is formed as the bus electrode on a part of a surface of the transparent dielectric layer. [0016] Furthermore, according to a preferred embodiment of the present invention, the electrical insulation of the transparent dielectric layer can be enhanced, or the electrodes and others on the front substrate of PDP can be covered with a high water resistant glass. BEST MODE FOR CARRYING OUT THE INVENTION [0017] The glass of the present invention is usually used for covering electrodes after subjected to powderization. The powderization is usually carried out by grinding and classifying the glass. Continue reading... Full patent description for Glass for covering electrode Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Glass for covering electrode patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Glass for covering electrode or other areas of interest. ### Previous Patent Application: Entrainment device for a centrifugal rotor Next Patent Application: Glass composition Industry Class: Compositions: ceramic ### FreshPatents.com Support Thank you for viewing the Glass for covering electrode patent info. IP-related news and info Results in 0.7181 seconds Other interesting Feshpatents.com categories: Daimler Chrysler , DirecTV , Exxonmobil Chemical Company , Goodyear , Intel , Kyocera Wireless , |
||
