INSULATING WIRES FOR ENAMELED WIRES Russian patent published in 2006 - IPC H01B3/42 

FIELD: electrical engineering; insulating materials for coating enameled wires.

SUBSTANCE: high-temperature surface-active materials used for the purpose are n-tertiary-butyl-phenol-formaldehyde resins. Condensation polymer (polyester, polyester-isocyanurate, polyester-imide, and polyester-amide-isocyanurate) is first synthesized and then dissolved in adequate solvent or set of solvents. Then n-tertiary-butyl-phenol-formaldehyde resins(dropping point 60 - 85 °C) are introduced in prepared varnish in the form of 50% tricresol solutions at temperature of 40 - 60 °C in the amount of 0.5 - 1% and mixed up for 3 - 4 h. Qualitative and quantitative composition of proposed insulating varnish is given in invention specification.

EFFECT: improved spreadability and stability of rheological, physical, and mechanical properties of proposed varnish.

5 cl, 1 tbl, 15 ex