Heat-resistant optical fiber and its preparation

Abstract

PURPOSE: To prepare a heat-resistant optical fiber which will not cause the fracture of a covering material, the increase in transmitting loss, etc. even at about 160°C, by covering a light transmitting glass fiber with a heat curable organopolysiloxane composition. CONSTITUTION: Immediately after the melt spinning of a parent material, the outer periphery of the light transmitting glass fiber 10 is coated with the first covering layer 15 with a thickness about 20W50μ consisting of a organopolysiloxane composition curable at normal temp. (e.g., phenylpolysiloxane composition) having a larger refractive index than that of the glass forming the outermost layer of the glass fiber. The second covering layer 16 with a thickness about 50W300μ consisting of a organopolysiloxane composition curable at normal temp. (preferably dimethylpolyciloxane composition) is applied to the first covering layer. This layer 16 is then covered with a heat curable organopolysiloxane) about 10,000 degree of polymerization) composition by extrusion so that the third covering layer 17 with a thickness about 100W300μ is formed, to give a heat-resistant fiber. COPYRIGHT: (C)1981,JPO&Japio

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Patent Citations (2)

    Publication numberPublication dateAssigneeTitle
    JP-S50155242-ADecember 15, 1975
    JP-S5263961-AMay 26, 1977Shin Etsu Chem Co LtdOrgano polysiloxane composition

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