Coating composition for forming a flexible dielectric coat with high dielectric permittivity

A method of forming a flexible coating having a high dielectric permittivity by applying a coating composition to a substrate, the coating composition comprising:

• i. a dielectric material selected from the group consisting of barium titanate <BaTiO3>, strontium titanate <SrTiO3>, calcium copper titanate <CaCu3Ti4O12>, cobalt (II) oxide, <CoO>, cobalt (II, III oxide)<Co3O4>, aluminum oxide <Al2O3> lanthanum oxide <La2O3>, conjugate polymers <CP>, and mixtures of these substances, of particle sizes 48-500 nm, from 15 to 30% w/w,
• ii. a polymeric dispersant comprising polyvinylpyrrolidone <PVP> having a relative molecular weight <Mr> from 44,000-54,000, from 1.00-10.00% w/w,
• iii. a polymeric binder comprising polyvinyl alcohol <PVOH>, from 1.00-10.00% w/w,
• iv. optionally, one or more auxiliary ingredients selected from the group consisting of a wetting agent, a plasticizer, an anti-foaming agent, a corrosion inhibitor, and an antioxidant, from 0.00-2.00 w/w,
• v. a surfactant having a hydrophilic-lipophilic balance factor of 13-40 and present in an amount up to 2.00 w/w, and
• vi. a water-miscible organic solvent, from 30.00-55.00% w/w, wherein the water-miscible organic solvent is selected from the group consisting of demineralized water and isopropanol, n-propanol, and mixtures of isopropanol and n-propanol in a weight ratio with a low molecular weight aliphatic alcohol <ROH> selected from methanol, ethanol, n-butanol, isobutanol, sec-butanol, and tert-butanol, in a weight ratio of isopropanol and/or n-propanol:
• 1:3-3:1, w/w.

A substrate coated with the coating composition comprising:

• i. a dielectric material selected from the group consisting of barium titanate <BaTiO3>, strontium titanate <SrTiO3>, calcium copper titanate <CaCu3Ti4O12>, cobalt (II) oxide, <CoO>, cobalt (II, III oxide)<Co3O4>, aluminum oxide <Al2O3> lanthanum oxide <La2O3>, conjugate polymers <CP>, and mixtures of these substances, of particle sizes 48-500 nm, from 15 to 30% w/w,
• ii. a polymeric dispersant comprising polyvinylpyrrolidone <PVP> having a relative molecular weight <Mr> from 44,000-54,000, from 1.00-10.00% w/w,
• iii. a polymeric binder comprising polyvinyl alcohol <PVOH>, from 1.00-10.00% w/w,
• iv. optionally, one or more auxiliary ingredients selected from the group consisting of a wetting agent, a plasticizer, an anti-foaming agent, a corrosion inhibitor, and an antioxidant, from 0.00-2.00 w/w,
• v. a surfactant having a hydrophilic-lipophilic balance factor of 13-40 and present in an amount up to 2.00 w/w, and
• vi. a water-miscible organic solvent, from 30.00-55.00% w/w, wherein the water-miscible organic solvent is selected from the group consisting of demineralized water and isopropanol, n-propanol, and mixtures of isopropanol and n-propanol in a weight ratio with a low molecular weight aliphatic alcohol <ROH> selected from methanol, ethanol, n-butanol, isobutanol, sec-butanol, and tert-butanol, in a weight ratio of isopropanol and/or n-propanol:
• 1:3-3:1, w/w.