Method of preparing thermoplastic random copolymer composition containing zinc oxide and aminosiloxane

A method of preparing a coating composition for a substrate comprising the steps of:

• a) providing a mixture having:
• i) a fluorocarbon thermoplastic random copolymer having subunits of:
• —(CH2CF2)x—, —(CF2CF(CF3)y—, and —(CF2CF2)z—,
• wherein
• x is from 1 to 50 or 60 to 80 mole percent.
• y is from 10 to 90 mole percent,
• z is from 10 to 90 mole percent, and
• x+y+z equals 100 mole percent;
• ii) a filler comprising zinc oxide;
• iii) a curable amino functional polydirrethyi siloxane copolymer:
• comprising aminofunctional units selected from the group consisting of (aminoethylarninopropyl) methyl, (aminopropyl) methyl and (aminopropyl) dimethyl;
• and
• iv) a bisphenol residue curing agent;
• b) providing a substrate;
• c) coating the substrate with the composition in an organic solvent;
• d) allowing the composition to dry on the substrate at ambient or elevated temperatures;
• and
• e) curing the composition for 3 to 10 hours at a temperature in the range of 220° C. to 280° C. and for an additional 2 to 10 hours at a temperature in the range of 250° C. to 270° C.