Patents by Inventor David Sturgill

David Sturgill has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11535769
    Abstract: Disclosed is a heat curable solvent free plastisol composition that exhibits very low volatile organic compound amounts while maintaining high performance characteristics. The present plastisol compositions have solvent substitutes used at amounts up to 15% by weight based on the total composition weight. The solvent substitutes have very low vapor pressures, stable viscosity effects, and are fusible with the plastisol polymers. These solvent substitutes can be used to replace the typical solvents without requiring extensive re-formulation of the plastisol composition. The final plastisol compositions according to the present invention exhibit low VOC measures of less than 0.03 pounds per gallon when measured according to EPA Method 24.
    Type: Grant
    Filed: December 29, 2016
    Date of Patent: December 27, 2022
    Assignee: Henkel AG & Co. KGaA
    Inventors: David Sturgill, Corina Bisog, Joshua Harju
  • Patent number: 10280340
    Abstract: Disclosed is method of preparing microspheres wherein the microspheres do not increase the self-extinguishing time of a composition they are added to by more than 5% and their presence does not increase a viscosity of the composition by more than 65%. The microspheres are coated with a very high level of from 80 to 90% by weight of a flame retardant, preferably aluminum trihydroxide. Unexpectedly, the presence of the flame retardant on the microspheres at this high level reduces the need to add additional flame retardant to a composition along with the microspheres. Also unexpectedly, the location of the flame retardant on the microspheres completely prevents the normally expected increase in viscosity of the composition based on the level of the flame retardant added. The microspheres find use in many compositions requiring flame resistance including weld through sealants and adhesives.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: May 7, 2019
    Assignee: Henkel IP & Holding GmbH
    Inventors: Robert E. Mammarella, David Sturgill
  • Publication number: 20170174955
    Abstract: Disclosed is method of preparing microspheres wherein the microspheres do not increase the self-extinguishing time of a composition they are added to by more than 5% and their presence does not increase a viscosity of the composition by more than 65%. The microspheres are coated with a very high level of from 80 to 90% by weight of a flame retardant, preferably aluminum trihydroxide. Unexpectedly, the presence of the flame retardant on the microspheres at this high level reduces the need to add additional flame retardant to a composition along with the microspheres. Also unexpectedly, the location of the flame retardant on the microspheres completely prevents the normally expected increase in viscosity of the composition based on the level of the flame retardant added. The microspheres find use in many compositions requiring flame resistance including weld through sealants and adhesives.
    Type: Application
    Filed: March 6, 2017
    Publication date: June 22, 2017
    Inventors: Robert E. Mammarella, David Sturgill
  • Patent number: 9133375
    Abstract: This invention relates to compositions useful as adhesives and more particularly to the preparation of heat-curable epoxy-based adhesive compositions that are resistant to being washed off substrate surfaces prior to being cured. The incorporation of a solid diene-based rubber, in particular an acrylonitrile-butadiene copolymer rubber having a relatively high Mooney viscosity, significantly enhances the wash-off resistance of the adhesive, while still allowing the adhesive to be readily dispensed by pumping under high shear conditions.
    Type: Grant
    Filed: April 29, 2010
    Date of Patent: September 15, 2015
    Assignee: Henkel AG & Co. KGaA
    Inventors: David Sturgill, Scott L. Hartsell, Jeng-Li Liang, Rajat K. Agarwal
  • Publication number: 20100272908
    Abstract: This invention relates to compositions useful as adhesives and more particularly to the preparation of heat-curable epoxy-based adhesive compositions that are resistant to being washed off substrate surfaces prior to being cured. The incorporation of a solid diene-based rubber, in particular an acrylonitrile-butadiene copolymer rubber having a relatively high Mooney viscosity, significantly enhances the wash-off resistance of the adhesive, while still allowing the adhesive to be readily dispensed by pumping under high shear conditions.
    Type: Application
    Filed: April 29, 2010
    Publication date: October 28, 2010
    Applicant: Henkel AG & Co. KGaA
    Inventors: David Sturgill, Scott L. Hartsell, Jeng-Li Liang, Rajat K. Agarwal
  • Patent number: 7019102
    Abstract: Blocked polyurethane prepolymers obtained by reacting at least one polyol, a first polyisocyanate comprising diphenylmethane diisocyanate, a second polyisocyanate having a viscosity at 25° C. of less than about 250 mPa·s, a phenol blocking agent, and an oxime blocking agent, wherein the weight ratio of second polyisocyanate:first polyisocyanate is not more than 0.65:1. The blocked polyurethane prepolymers are especially useful in formulating coating compositions additionally comprising at least one acrylic resin, at least one plasticizer, at least one filler, and optionally other ingredients and additives. A cured coating is obtained by applying a layer of the coating composition to a substrate surface and heating the coating composition layer.
    Type: Grant
    Filed: June 18, 2004
    Date of Patent: March 28, 2006
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Rainer Schoenfeld, Corina Bisog, David Sturgill, Kazuhiko Sato
  • Publication number: 20050282990
    Abstract: Blocked polyurethane prepolymers obtained by reacting at least one polyol, a first polyisocyanate comprising diphenylmethane diisocyanate, a second polyisocyanate having a viscosity at 25° C. of less than about 250 mPa.s, a phenol blocking agent, and an oxime blocking agent, wherein the weight ratio of second polyisocyanate:first polyisocyanate is not more than 0.65:1. The blocked polyurethane prepolymers are especially useful in formulating coating compositions additionally comprising at least one acrylic resin, at least one plasticizer, at least one filler, and optionally other ingredients and additives. A cured coating is obtained by applying a layer of the coating composition to a substrate surface and heating the coating composition layer.
    Type: Application
    Filed: June 18, 2004
    Publication date: December 22, 2005
    Inventors: Rainer Schoenfeld, Corina Bisog, David Sturgill, Kazuhiko Sato