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

A coating composition for room-temperature preparation of a flexible dielectric coating with high dielectric permittivity, 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>, 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. a water-miscible organic solvent, from 30.00-55.00% w/w,
• v. optionally, one or more auxiliary ingredients required for achieving particular technology properties of the resulting composition during the application via spraying or printing, the one or more auxiliary ingredients being one of a wetting agent, a plasticizer, an anti-foaming agent, a corrosion inhibitor, an antioxidant, from 0.00-2.00% w/w,
• vi. a surfactant having a hydrophilic-lipophilic balance factor of 13-40 and present in an amount up to 2.00% w/w, and
• vii. a demineralized water, up to 100.00% of the composition,
• the water-miscible organic solvent is selected from the group consisting of 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,
• and wherein said composition provides high dielectric permittivity and providing a signal gain increase of 25 dB to 30 dB when applied to an antenna.