Polymeric coating compositions, polymer coated substrates, and methods of making and using the same

A method for forming a coated substrate comprising the steps of:

• (a) forming a prepolymer mixture comprising:
• (i) from 25 to 99 parts by wt of a poly(amide-imide) prepolymer;
• (ii) from 1 to 25 parts by wt of a trifunctional ester selected from the group consisting of trifunctional methacrylate ester, trifunctional acrylate ester, and mixtures thereof;
• and
• (iii) from 0.5 to 15 parts by wt of an organo-reactive silane consisting of an amino group containing alkoxysilane having the formula NH2(CH2)nSi(OC2H5)3 where n is an integer from 1 to 20;
• (iv) a solvent for said components (i)-(iii);
• and
• (v) an effective amount of conductive filler;
• (b) applying said prepolymer mixture to the surface of said substrate;
• and
• (c) curing said prepolymer mixture.

A polymeric composition comprising:

• (a) from 25 to 99 parts by weight of a poly(amide-imide) prepolymer;
• (b) from 1 to 25 parts by weight of a trifunctional ester selected from the group consisting of trifunctional methacrylate ester, trifunctional acrylate ester, and mixtures thereof;
• and
• (c) from 0.5 to 15 parts by weight of an organo-reactive silane consisting of an amino group containing alkoxysilane having the formula NH2(CH2)n Si(OC2H5)3 where n is an integer from 1 to 20.