FIBRE-OPTIC GUIDES POLYIMIDE COATING AND PREPARATION METHOD THEREOF Russian patent published in 2017 - IPC C09D133/24 C08G73/10 G02B6/02 C03C25/16 C03C25/32 

FIELD: lighting.

SUBSTANCE: invention relates to fibre-optic guides novel heat-resistant soluble polyimide coatings and their production method. Produced coatings are characterized by satisfactory adhesion to fibre both in presence of keying agent, and without it. In disclosed method coating is formed from solution of ready homo- or copolyimide of specified structural formula. Method of coating making involves light guide drawing from workpiece, its drawing through spinneret, containing polyimide solution and solvent removing with heating, wherein polyimide is used in form of solution with viscosity of 2,400–18,000 MPa×s, and solvent is removed by heating in furnace at 50–350 °C. As polyimides solvents aprotic solvents are used. Proposed method, which uses polyimide, rather than its precursor (corresponding polyamide acid), enables avoiding stage of polyamide acid high-temperature cyclization to polyimide and need for polymer solution multiple application on light guide, which provides reducing time and power inputs for manufacturing of soluble heat-resistant coating.

EFFECT: coating can be easily removed using corresponding solvent.

4 cl, 1 tbl, 5 dwg, 15 ex