Glass mouldings with an antistatic finish, esp. TV tubes - coated with an antistatic layer of poly-thiophene, and pref. also with an outer protective layer of polymer

• Main Authors: JONAS, FRIEDRICH. DR., 5100 AACHEN, DE, DHEIN, ROLF. DR., 4150 KREFELD, DE
• Format: Patent
• Language: English; German
• Published: 03.03.1994
• Edition: 5
• Subjects: ADHESIVES; BASIC ELECTRIC ELEMENTS; CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; COMPOSITIONS BASED THEREON; DYES; ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MINERAL OR SLAG WOOL; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NATURALLY-OCCURRING ELECTRICITY; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; STATIC ELECTRICITY; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; THEIR PREPARATION OR CHEMICAL WORKING-UP

Moulded glass prods. with an antistatic finish are claimed. The antistatic finish is obtd. by coating with a polythiophene of formula (I), where R1, R2 = H or 1-4C alkyl, or the two gps. together form an opt. substd. 1-4C alkylene gp.,pref. opt. alkyl-substd. methylene,opt. (1-12C alkyl)- or Ph-substd. 1,2-ethylene, 1,3-propylene or 1,2-cyclohexylene. The antistatic coating is pref. covered with a layer of organic or inorganic polymer. Coatings of (I) are prepd., e.g. as described in EP-A 339340 and 440957, pref. to form a transparent layer 20 nm t 10 microns thick with resistance below 10 power 10 ohm/sq., esp. with silane coupling agents to improve adhesion of (I) to glass. Pref. outer protective coating is a layer of PMMA, crosslinked alkyd resin or polyurethane etc., 0.1-100 microns thick. USE/ADVANTAGE - The coating provides an effective antistatic finish for moulded glass prods., esp. TV tubes, to prevent dust collecting on the surface, and also acts as a screen against electromagnetic radiation.