PRODUCTION OF QUARTZ GLASS SYSTEM LIGHT TRANSMITTING PRODUCT

PURPOSE:To produce the titled light transmitting product having a thick precoat layer free from foaming and excellent in heat resistance and radiation resistance, by applying a precoat layer consisting of a polyimide to quartz glass based light transmitting product several times. CONSTITUTION:A core...

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Bibliographische Detailangaben
Hauptverfasser:	ISHITOBI MASAMI, NAGAI MASAAKI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY GLASS JOINING GLASS TO GLASS OR OTHER MATERIALS METALLURGY MINERAL OR SLAG WOOL OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHYSICS SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS
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Beschreibung
Zusammenfassung:	PURPOSE:To produce the titled light transmitting product having a thick precoat layer free from foaming and excellent in heat resistance and radiation resistance, by applying a precoat layer consisting of a polyimide to quartz glass based light transmitting product several times. CONSTITUTION:A core 3 prepared by pulling up a quartz glass preformer 1 melted in a melt oven 2 is passed through an organic solvent solution of wholly aromatic polyimide containing >=30% imide group expressed by the formula (R1-2 are 4-50C, preferably 6-20C aliphatic, alicyclic aromatic or heterocyclic tetravalent organic groups) via the first die 4 to form a coating layer 5 and then passed through a curing oven 6 to form a precoat layer 7. Then the treated core is passed through an organic solvent solution of wholly aromatic polyimide as same as above-mentioned via the second die 8 to form a coating layer and passed through curing ovens 9 and 10 to form a precoat layer and wound to a winder 11.