ELECTRICALLY INSULATING POLYETHERIMIDE VARNISH Russian patent published in 2008 - IPC H01B3/42 

FIELD: electricity, chemistry.

SUBSTANCE: electrically insulating polyetherimide siliceous varnish is suggested, composed of polyetherimide siliceous resin, solvent, tetrabutoxytitan and cresol solvent obtained through processing of coal-tar oil and further composed of phenol, o-, m-, p- cresols, and xylenols with the following fractional composition, % (volumetric): below 180°С no more than 3, from 180 to 205°С no less than 70, up to 210°С no less than 85. The technical result achieved by implementing the invention comprises lowering of varhish cost together with improvement of final product quality due to exclusion of expensive tricresol from varhish composition and its replacement by cresol solvent obtained by coal-tar oil processing.

EFFECT: obtained varnish provides for reliable protection of wires with polyetherimide insulation with temperature index of 155.

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