Hydrophobic silica coating

• US 5,204,088 A
• Filed: 08/15/1991
• Issued: 04/20/1993
• Est. Priority Date: 04/18/1989
• Status: Expired due to Fees

• Current Assignee: Globe Technology Corporation
• Original Assignee: Globe Technology Corporation
• Inventors: Elliott, Lane, Noebel, Roger D.
• Primary Examiner(s): Wityshyn, Michael G.
• Application Number:
  US07/749,486
• Time in Patent Office: 614 Days
• Field of Search: 222/4, 424/47, 424/401
• US Class Current: 424/47
• CPC Class Codes: A61K 2800/413 Nanosized, i.e. having sizes below 100 nm
• CPC Class Codes: A61K 8/046 Aerosols; Foams
• CPC Class Codes: A61K 8/11 Encapsulated compositions
• CPC Class Codes: A61K 8/25 Silicon; Compounds thereof
• CPC Class Codes: A61K 8/585 Organosilicon compounds
• CPC Class Codes: A61Q 15/00 Anti-perspirants or body deodorants deodorisation of air A61L9/00
• CPC Class Codes: B82Y 5/00 Nanobiotechnology or nanomedicine, e.g. protein engineering or drug delivery
• CPC Class Codes: Y10S 977/779 Possessing nanosized particles, powders, flakes, or clusters other than simple atomic impurity doping
• CPC Class Codes: Y10S 977/847 Surface modifications, e.g. functionalization, coating
• CPC Class Codes: Y10S 977/89 Deposition of materials, e.g. coating, cvd, or ald

Abstract

An applicator which can readily and conveniently generate an aerosol of hydrophobic silica particles without the need for hoppers, rotating vanes, compressed dry air purged rotors, venturis, or other complex apparatus, and a method of applying a friction enhancing and water repelling coating to a surface using such an applicator. The applicator can readily produce a submicron hydrophobic silica aerosol even from hydrophobic silica particles which normally aggregate into conglomerates of greater than 1μ in diameter. The applicator uses an aerosol dispenser with a nozzle communicating with the interior of the container thereof, and a pressurized propellant. The dispenser is charged with a suspension of hydrophobic silica particles in a volatile liquid, for example ethanol. The applicator and method are particularly useful in applying a grip enhancing and water repelling coating to an individual'"'"'s hands and/or various equipment, such as athletic equipment, prior to participating in sports where improved grip is desirable, such as in football, baseball, golf, etc. Further, high efficiency particulate filters can be readily and conveniently tested using the applicator.

Claims

1. A system for at least one of repelling water and enhancing friction on a surface comprising,

an applicator comprising an aerosol dispenser, wherein the aerosol dispenser includes a container, a pressurized propellant therein, and a nozzle communicating with the interior of the container, and

a colloidal suspension of hydrophobic silica particles within the container consisting of hydrophobic silica particles suspended in a C1 to C4 alcohol, wherein the hydrophobic silica particles have a mean diameter of between about 5 to 40 nm, a substantial proportion of which particles are aggregated into conglomerates of greater than about 1μ

in diameter, and which particles have been rendered hydrophobic by treatment with an organosilane having hydrocarbon chains of between 4 to 30 carbon atoms, said suspension being ejectable by said propellant through said nozzle as an aerosol to a surface to provide a coating of silica particles agglomerated into conglomerates of submicron sizes.