Hydrophilic anti-fog coatings

{
  "publication_number": "US9840639B2",
  "country": "US",
  "kind": "B2",
  "title": "Hydrophilic anti-fog coatings",
  "abstract": "The present invention relates to hydrophilic anti-fog coatings. In particular, the coatings use two types of nanoscale particles, colloidal silica and porous organosilicate micelles, in a polyurethane matrix. The invention is an anti-fog coating for optically clear substrates (polycarbonate, polyurethane, nylon, polyester and other clear plastics) without the need for a primer and glass or oxide substrates with an additional primer layer, comprising monosized colloidal silica nanoparticles and porous organosilicate micelles in a polyurethane matrix. The silica is preferably 1-5% by weight and the micelles are loaded at 0.1 to 10% volume percentage by volume. The polyurethane prepolymer is dissolved at 10-40% by weight in a mixture of tertiary amyl alcohol and diacetone alcohol to customize for dip, flow or spray coating processes",
  "claims": [
    "1. A chemical resistant, transparent anti-fog coating for optically clear surfaces comprising colloidal silica and porous organosilicate micelles in a polyurethane matrix, a. colloidal silica having monosized nanoparticles with a particle size of 25 to 35 nanometers, the colloidal silica nanoparticles comprising 1-5% by weight of the coating; b. porous organosilicate micelles being 5-10 nanometers in size and comprising 0.1 to 10% by volume of the coating, each micelle having a porous hydrophilic silicate shell and a hydrophilic micellar core or a porous hydrophilic silicate shell and a hydrophobic micellar core.",
    "2. The coating of claim 1 where the organosilicate micelles result from precursors selected from the following group: N-(Acetylglycyl)-3-aminopropyltrimethoxysilane; 2-[(Acetoxy(polyethyleneoxy)propyl]triethoxysilane; and 3-cyanopropyltrimethoxysilane.",
    "3. An anti-fog coating with sustained water-sheeting and durability properties for plastic substrates comprising monosized colloidal silica nanoparticles and porous organosilicate micelles in a polyurethane matrix wherein, the monosized colloidal silica nanoparticles are 25-35 nm in the coating, absorb water droplets or moisture and create a sheeting action at the coating surface to prevent fogging and are from 1-5% by weight; and, the porous organosilicate micelles are loaded at 0.1 to 10% volume percentage by volume, are 5-10 nm in the coating and draw water or moisture to the porous micellar surface, said micelles comprising a hydrophilic core that serves as a reservoir to sustain superhydrophilic properties and fogging resistance of a coated surface.",
    "4. The anti-fog coating of claim 3 where the polyurethane matrix is formed from a prepolymer dissolved at a concentration of 10-40% by weight in a mixture of tertiary amyl alcohol and diacetone alcohol, said mixture formulated to have a viscosity suitable for either dip, flow or spray coating of the plastic optical surface."
  ],
  "cpc": [
    "C09D 175/04",
    "B82Y 20/00",
    "C08G 18/10",
    "C08G 18/282",
    "C08G 2290/00",
    "C08G 77/26",
    "C08G 77/46",
    "C08K 2201/005",
    "C08K 2201/011",
    "C08K 3/34",
    "C08K 3/36",
    "C08K 7/26",
    "C08L 75/04",
    "C08L 83/02",
    "C09D 175/00",
    "G02B 1/04",
    "G02B 1/18"
  ],
  "assignees": [
    "INNOSENSE LLC"
  ],
  "filing_date": "2015-03-20",
  "publication_date": "2017-12-12",
  "grant_date": "2017-12-12",
  "priority_date": "2014-03-27",
  "application_number": "US-201514664049-A",
  "family_id": "52811262",
  "citations": [
    "CA2111468C",
    "CA2260778C",
    "DE69737122T2",
    "EP0600053B1",
    "EP0914364B1",
    "JP2003073147A",
    "US2001036547A1",
    "US2002061950A1",
    "US2002176983A1",
    "US2003207090A1",
    "US2004237833A1",
    "US2004248995A1",
    "US2004258929A1",
    "US2005137334A1",
    "US2005233135A1",
    "US2007215004A1",
    "US2009029145A1",
    "US2009053465A1",
    "US2009098409A1",
    "US2010062152A1",
    "US2010068486A1",
    "US2010092765A1",
    "US2010104858A1",
    "US2010221513A1",
    "US2010291295A1",
    "US2010304150A1",
    "US2011033694A1",
    "US2011073003A1",
    "US2011183566A1",
    "US2011256312A1",
    "US2011318567A1",
    "US2012019767A1",
    "US2012019915A1",
    "US2012027933A1",
    "US2012045954A1",
    "US2012052289A1",
    "US2012177928A1",
    "US3867175A",
    "US4409285A",
    "US4765729A",
    "US5073404A",
    "US5262233A",
    "US5262475A",
    "US5462587A",
    "US6013372A",
    "US6045903A",
    "US6071606A",
    "US6156409A",
    "US6337129B1",
    "US6350397B1",
    "US6387519B1",
    "US6420020B1",
    "US6503631B1",
    "US6506446B2",
    "US6587263B1",
    "US6716513B1",
    "US6783845B2",
    "US6835322B2",
    "US7294365B2",
    "US7361394B2",
    "US7503964B2",
    "US7892606B2",
    "US7919145B2",
    "US7981506B2",
    "US7998554B2",
    "US8227076B2",
    "US8227085B2",
    "US8281657B2",
    "WO2004013063A1",
    "WO9323471A1",
    "WO9803575A1"
  ]
}