Method of obtaining insulating coating composition, coating composition and conductive materials comprising the same

A method of obtaining insulating coating composition comprising the steps of:

• i) carrying out a polyesterification reaction, by the forming isolated polyester in situ in a solid medium by loading the reaction medium with monomers of at least one acidic component, in a concentration range of 5% to 10%;
• monomers of at least one alcoholic component, in a range of 3% to 25%;
• and at least one catalyst, in a range of 0.01% to 1.0%, under heating from 180 to 260° C. until an acid number of less than 5 mgKOH/g is reached;
• ii) carrying out a polycondensation reaction comprising:
• a) forming an imide moiety in situ in a solid medium by loading the reaction medium with monomers of at least one acidic component, in a range of 8% to 18%;
• and monomers of at least one amine component, in a range of 2% to 10% under heating from 180 to 260° C., for 1 to 8 hours;
• b) cooling the medium to a temperature range between 12° and 180° C., with new loading of the reaction medium with monomers of at least one acidic component, in a range of 8% to 18%;
• and monomers of at least one amine component, in a range of 2% to 10%, until the medium reaches a kinematic viscosity in the range of 50 to 80 seconds;
• iii) dissolving the material resulting from step ii, using at least one organic solvent selected from the group consisting of glycol ethers, dimethylglycol, ethylglycol, isopropylglycol, butylglycol, methyldiglycol, ethyldiglycol, butyldiglycol, 3,5,5-trimethyl-2-cyclohexen-1-one, alkylbenzene, phenyl glycol, glycol ether esters, methyl glycol acetate, butyl glycol acetate, and methoxypropylacetate;
• iv) carrying out additivation by incorporating at least one additive at a temperature below 100° C. selected from the group consisting of a curing additive, chain-increasing additive and antioxidant additive;
• v) adjusting viscosity by adding an organic solvent, diluent or a combination thereof, at a temperature below 100° C.