Composition for forming a conformal coating on an electronic device

Abstract

A composition for forming a protective coating on an electronic device that is in the form of a non-Newtonian fluid that exhibits both viscous and elastic properties, and that forms at least one coating that is hydrophobic, oleophobic, or oleophilic is disclosed. The viscous and elastic properties associated with the non-Newtonian fluid allows the composition to redistribute after being applied as a coating an electronic device. Methods for protecting an electronic device from liquid contaminants by applying the disclosed composition and electronic devices comprising the composition are also disclosed. An electronic device, such as a printed circuit board, having a film made of the composition is also disclosed.

1 . A composition for forming a conformal coating on a substrate, the composition comprising:
 (a) at least one hydrophobic fluid; and   (b) one or more functionalized polysiloxanes, linear and cyclic silicones, styrene-ethylene/butylene-styrene or styrene-ethylene/propylene-styrene materials swelled with mineral oils or diesters, long chain fatty alcohols, functionalized fluoropolymers, functionalized or non-functionalized poly oligomeric silsesquioxanes, and polyolefins,   wherein the composition has viscoelastic or non-Newtonian properties.   
     
     
         2 . The composition of  claim 1 , wherein said conformal coating is able to redistribute after being applied to the substrate. 
     
     
         3 . (canceled) 
     
     
         4 . The composition of  claim 1 , further comprising one or more solid particles selected from fluoropolymer particles, clay particles, mica, metal alkoxide particles, rare earth and transition metals, carbon-based materials selected from graphene, graphite, and carbon nanotubes, and metal organic frameworks. 
     
     
         5 . The composition of  claim 1 , further comprising one or more additives selected from a surfactant, a dispersant, hygroscopic material or a rheological modifier. 
     
     
         6 . The composition of  claim 1 , wherein the composition is suspended in a carrier solvent comprised of at least one compound chosen from low molecular weight mineral oils, paraffins or iso-paraffins, alkanes or iso-alkanes, low molecular weight linear silicones or cyclic silicones, alkyl acetates, ketones, fully or partially halogenated hydrocarbons, or aldehydes. 
     
     
         7 . The composition of  claim 1 , wherein the conformal coating has a thickness ranging from 25 nm to 200 μm when applied to an electronic device. 
     
     
         8 . The composition of  claim 1 , wherein the conformal coating increases resistance to liquid or particulate contaminants or is electrically insulating. 
     
     
         9 - 27 . (canceled) 
     
     
         28 . The composition of  claim 1 , wherein the substrate comprises an electronic device. 
     
     
         29 . The composition of  claim 28 , wherein the electronic device is an assembled printed circuit board. 
     
     
         30 . The composition of  claim 1 , wherein the conformal coating exhibits electrical insulating properties. 
     
     
         31 . The composition of  claim 1 , wherein the conformal coating is hydrophobic, oleophobic, oleophilic, or a combination thereof. 
     
     
         32 . The composition of  claim 1 , wherein the conformal coating is non-polar. 
     
     
         33 . The composition of  claim 1 , which comprises a mixture of two or more hydrophobic fluids with two or more hydrophobic particles. 
     
     
         34 . The composition of  claim 5 , wherein at least one hygroscopic material comprises a polysaccharide gum, a carbomer, or combinations thereof. 
     
     
         35 . A composition for forming a conformal coating on a substrate, the composition comprising:
 (a) at least one hydrophobic fluid selected from the group consisting of: polysiloxanes, linear and cyclic silicones; and   (b) one or more polysiloxane, or functionalized or non-functionalized poly oligomeric silsesquioxane,   wherein the composition has viscoelaastic or non-Newtonian properties.   
     
     
         36 . The composition of  claim 35 , further comprising one or more additives selected from a surfactant, a dispersant, hygroscopic material or a rheological modifier. 
     
     
         37 . The composition of  claim 35 , wherein the composition is suspended in a carrier solvent comprised of at least one compound chosen from low molecular weight mineral oils, paraffins or iso-paraffins, alkanes or iso-alkanes, low molecular weight linear silicones or cyclic silicones, alkyl acetates, ketones, fully or partially halogenated hydrocarbons, or aldehydes. 
     
     
         38 . The composition of  claim 35 , wherein the conformal coating has a thickness ranging from 25 nm to 200 μm when applied to an electronic device and increases resistance to liquid or particulate contaminants or is electrically insulating. 
     
     
         39 . The composition of  claim 35 , wherein the substrate comprises an electronic device. 
     
     
         40 . The composition of  claim 39 , wherein the electronic device comprises a printed circuit board. 
     
     
         41 . The composition of  claim 35 , wherein the conformal coating is hydrophobic, oleophobic, oleophilic, or a combination thereof. 
     
     
         42 . The composition of  claim 35 , wherein the conformal coating is non-polar. 
     
     
         43 . The composition of  claim 35 , which comprises a mixture of two or more of said hydrophobic fluids with two or more of said particles. 
     
     
         44 . The composition of  claim 35 , wherein said conformal coating has viscoelastic or non-Newtonian properties and is able to redistribute after being applied to the substrate. 
     
     
         45 . A composition for forming a conformal coating on a substrate, the composition comprising:
 (a) one or more hydrophobic fluid selected from the group consisting of: polysiloxanes, linear and cyclic silicones; and   (b) one or more polysiloxane, functionalized or non-functionalized poly oligomeric silsesquioxane, fumed functionalized silica, and combinations thereof,   wherein the composition has viscoelastic or non-Newtonian properties.   
     
     
         46 . The composition of  claim 45 , further comprising one or more additives selected from a surfactant, a dispersant, hygroscopic material or a rheological modifier. 
     
     
         47 . The composition of  claim 45 , wherein the composition is suspended in a carrier solvent comprised of at least one compound chosen from low molecular weight mineral oils, paraffins or iso-paraffins, alkanes or iso-alkanes, low molecular weight linear silicones or cyclic silicones, alkyl acetates, ketones, fully or partially halogenated hydrocarbons, or aldehydes. 
     
     
         48 . The composition of  claim 45 , wherein the conformal coating has a thickness ranging from 25 nm to 200 μm when applied to an electronic device and increases resistance to liquid or particulate contaminants or is electrically insulating. 
     
     
         49 . The composition of  claim 45 , wherein the substrate comprises an electronic device. 
     
     
         50 . The composition of  claim 49 , wherein the electronic device is an assembled printed circuit board. 
     
     
         51 . The composition of  claim 45 , wherein the conformal coating is hydrophobic, oleophobic, oleophilic, or a combination thereof. 
     
     
         52 . The composition of  claim 45 , wherein the conformal coating is non-polar. 
     
     
         53 . The composition of  claim 45 , which comprises a mixture of two or more of said hydrophobic fluids with two or more of said particles. 
     
     
         54 . The composition of  claim 45 , wherein said conformal coating has viscoelastic or non-Newtonian properties and is able to redistribute after being applied to the substrate. 
     
     
         55 . A composition for forming a conformal coating on a substrate, the composition comprising:
 (a) one or more hydrophobic fluid selected from the group consisting of: polyolefins, mineral oils or diesters, or long chain fatty alcohols; and   (b) one or more copolymers selected from the group consisting of: styrene-ethylene/butylene-styrene, and styrene-ethylene/propylene-styrene,   wherein the composition has viscoelastic or non-Newtonian properties.   
     
     
         56 . The composition of  claim 55 , further comprising one or more additives selected from a surfactant, a dispersant, hygroscopic material or a rheological modifier. 
     
     
         57 . The composition of  claim 55 , wherein the composition is suspended in a carrier solvent comprised of at least one compound chosen from low molecular weight mineral oils, paraffins or iso-paraffins, alkanes or iso-alkanes, low molecular weight linear silicones or cyclic silicones, alkyl acetates, ketones, fully or partially halogenated hydrocarbons, or aldehydes. 
     
     
         58 . The composition of  claim 55 , wherein the conformal coating has a thickness ranging from 25 nm to 200 μm when applied to an electronic device and increases resistance to liquid or particulate contaminants or is electrically insulating. 
     
     
         59 . The composition of  claim 55 , wherein the substrate comprises an electronic device. 
     
     
         60 . The composition of  claim 59 , wherein the electronic device is an assembled printed circuit board. 
     
     
         61 . The composition of  claim 55 , wherein the conformal coating is hydrophobic, oleophobic, oleophilic, or a combination thereof. 
     
     
         62 . The composition of  claim 55 , wherein the conformal coating is non-polar. 
     
     
         63 . The composition of  claim 55 , which comprises a mixture of two or more of said hydrophobic fluids with two or more of said particles. 
     
     
         64 . The composition of  claim 55 , wherein said conformal coating has viscoelastic or non-Newtonian properties and is able to redistribute after being applied to the substrate.