Patents by Inventor Gamini S. Samaranayake

Gamini S. Samaranayake 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: 11912901
    Abstract: A waterborne coating composition including a novel polymer latex and methods of preparing the polymer latex for the waterborne coating composition. The disclosed polymer latex, when incorporated into the waterborne coating composition, reduces gloss, and achieves a matte appearance without the need for and/or with reduced amounts of traditional inorganic matting additives. In one approach, the polymer latex disclosed herein includes latex particles having a core/shell arrangement configured to not only participate in film formation but also impact surface morphology of dried films to produce the low gloss coatings.
    Type: Grant
    Filed: December 29, 2021
    Date of Patent: February 27, 2024
    Assignee: SWIMC LLC
    Inventors: Gamini S. Samaranayake, Shailesh S. Shah, Joseph J. Kestner, Kimberly A. Koglin, Tom Wendland, Margaret Patterson
  • Patent number: 10676634
    Abstract: A self-crosslinking compound and coating compositions including the same as well as compositions capable of forming a ketone or carbonyl-hydrazide crosslink at ambient temperatures that utilizes a modified latent cross linker capable of forming a polymer networked in an applied coating.
    Type: Grant
    Filed: September 5, 2018
    Date of Patent: June 9, 2020
    Assignee: SWIMC LLC
    Inventor: Gamini S Samaranayake
  • Publication number: 20200071559
    Abstract: A self-crosslinking compound and coating compositions including the same as well as compositions capable of forming a ketone or carbonyl-hydrazide crosslink at ambient temperatures that utilizes a modified latent cross linker capable of forming a polymer networked in an applied coating.
    Type: Application
    Filed: September 5, 2018
    Publication date: March 5, 2020
    Applicant: THE SHERWIN-WILLIAMS COMPANY
    Inventor: GAMINI S. SAMARANAYAKE
  • Publication number: 20130261222
    Abstract: A polymer for use in multiple applications that utilizes a polymerization and transesterification route with raw materials preferably of bio-based and/or renewable origin. The polymer includes an aliphatic diacid or reactive equivalent thereof, one or more diols, and a polyalkylene terephthalate or polyalkylene napthenate which are heated under conditions of melt processing at a sufficient temperature and pressure whereby transesterification and polymerization occurs. Also provided is an admixing process that includes an end-capping or chain stopping molecule, which is added to the reaction mixture before the polymerization is complete. Additionally provided is a polymer prepared according to an admixing process that incorporates natural proteins (e.g., isolated soy proteins), carbohydrates (e.g., starch, cellulose and their derivatives), soya fatty acids, or soy meal under conditions whereby transesterification and/or transamidation occurs.
    Type: Application
    Filed: March 15, 2013
    Publication date: October 3, 2013
    Applicant: THE SHERWIN-WILLIAMS COMPANY
    Inventors: David A. Schiraldi, Gamini S. Samaranayake, Madhukar Rao, Philip J. Ruhoff, Stacey A. Porvasnik
  • Publication number: 20110021734
    Abstract: Film forming polymers derived substantially from biorenewable polysaccharides may be formed as the emulsion polymerization products of a blend of hydrophobic polysaccharides and ethylenically unsaturated monomers. The hydrophobic polysaccharides may be prepared as the emulsion reaction product of a water soluble polysaccharide and a monomer mixture of hydrophilic ethylenically unsaturated monomers and hydrophobic ethylenically unsaturated monomer, in the presence of a water soluble chain transfer agent.
    Type: Application
    Filed: July 14, 2010
    Publication date: January 27, 2011
    Applicant: THE SHERWIN-WILLIAMS COMPANY
    Inventors: Gamini S. Samaranayake, Richard F. Tomko, Philip J. Ruhoff, Madhukar Rao
  • Publication number: 20100160551
    Abstract: A hybrid alkyd acrylic latex and a process for its preparation are taught. The process comprises forming an oil phase comprising an alkyd, a drier, and at least one ethylenically unsaturated monomer, wherein the oil phase solubilizes the drier; combining the oil phase with an aqueous phase, wherein the aqueous phase comprises a surfactant, to form a pre-emulsion; homogenizing the pre-emulsion thereby forming a miniemulsion, wherein the drier is solubilized in the oil phase; initiating the polymerization by adding a free radical initiator, thereby polymerizing the at least one ethylenically unsaturated monomer in the miniemulsion and forming a latex polymer emulsion having latex polymer particle sizes in the range of 40 nm to 700 nm.
    Type: Application
    Filed: December 22, 2009
    Publication date: June 24, 2010
    Applicant: THE SHERWIN-WILLIAMS COMPANY
    Inventors: James K. Marlow, Paul M. Kayima, Gamini S. Samaranayake, Madhukar Rao
  • Patent number: 6767638
    Abstract: This invention concerns cationic core-shell particles having a polymeric core component and a polymeric shell component disposed generally about said core, wherein said shell contains a stabilizer that is covalently bonded to the polymeric shell component. More particularly, the invention concerns the use of these core-shell particles in formulating ink jet receptive coatings.
    Type: Grant
    Filed: November 8, 2002
    Date of Patent: July 27, 2004
    Assignee: MeadWestvaco Corporation
    Inventor: Gamini S. Samaranayake
  • Patent number: 6743514
    Abstract: This invention pertains to radiation-curable aqueous compositions comprising a mixture of water-reducible oligomer, monomer, and water-insoluble cationically-modified latex. More particularly, the invention pertains to radiation-curable aqueous compositions that are suitable for use as ink jet printing receptive coatings and in the production of ink jet printable products.
    Type: Grant
    Filed: March 15, 2002
    Date of Patent: June 1, 2004
    Assignee: MeadWestvaco Corporation
    Inventor: Gamini S. Samaranayake
  • Publication number: 20030215604
    Abstract: This invention concerns cationic core-shell particles having a polymeric core component and a polymeric shell component disposed generally about said core, wherein said shell contains a stabilizer that is covalently bonded to the polymeric shell component. More particularly, the invention concerns the use of these core-shell particles in formulating ink jet receptive coatings.
    Type: Application
    Filed: November 8, 2002
    Publication date: November 20, 2003
    Applicant: Westvaco Corporation
    Inventor: Gamini S. Samaranayake
  • Patent number: 6572969
    Abstract: This invention concerns cationic core-shell particles having a polymeric core component and a polymeric shell component disposed generally about said core, wherein said shell contains a stabilizer that is covalently bonded to the polymeric shell component. More particularly, the invention concerns the use of these core-shell particles in formulating ink jet receptive coatings.
    Type: Grant
    Filed: May 16, 2002
    Date of Patent: June 3, 2003
    Assignee: MeadWestvaco Corporation
    Inventor: Gamini S. Samaranayake
  • Patent number: 6521343
    Abstract: This invention concerns cationic core-shell particles having an acid-insoluble polymeric core component and an acid-swellable polymeric shell component disposed generally about said core so that upon neutralizing said shell with acid, a portion of said shell remains attached or associated with said core; and wherein said shell contains a stabilizer that is covalently bonded to the polymeric shell component. This invention further concerns polymer latex compositions wherein said polymeric shell component has been neutralized and substantially, but not totally, dissolved so as to form a blend of neutralized core-shell polymer and an aqueous solution of neutralized shell polymer. More particularly, the invention concerns the use of latex compositions produced from these cationic core-shell particles to formulate ink jet receptive coatings.
    Type: Grant
    Filed: July 12, 2002
    Date of Patent: February 18, 2003
    Assignee: Westvaco Corporation
    Inventors: Gamini S. Samaranayake, G. Frederick Hutter, Camille K. Stebbins
  • Publication number: 20020192438
    Abstract: This invention pertains to cationic acrylic colloidal dispersion polymers which contain a stabilizer that is covalently bonded to the polymer. More particularly, the invention pertains to the use of stabilizer-containing cationic acrylic colloidal dispersion polymer compositions to enhance the ink jet printability of coating formulations.
    Type: Application
    Filed: August 7, 2002
    Publication date: December 19, 2002
    Applicant: Westvaco Corporation
    Inventors: G. Frederick Hutter, Camille K. Stebbins, Gamini S. Samaranayake
  • Patent number: 5989299
    Abstract: Dyestuff compositions are provided which incorporate, as the grinding aid and/or dispersant therefor, amine modified lignin admixed with sulfonated lignin. The disclosed dyestuff compositions exhibit improved heat stability and, as a result of the higher activity of the dispersant mixture of amine modified lignin blended with sulfonated lignin, less dispersant is present in the exhaust liquor and waste treatment demands are thereby reduced. The improved package dyeing grinding aid/dispersant of the invention is prepared by mixing an amine modified lignin with a sulfonated lignin.
    Type: Grant
    Filed: May 26, 1998
    Date of Patent: November 23, 1999
    Assignee: Westvaco Corporation
    Inventors: Peter Dilling, Gamini S. Samaranayake
  • Patent number: 5972047
    Abstract: Dyestuff compositions are provided which incorporate amine modified sulfonated lignins. The disclosed dyestuff compositions exhibit improved heat stability and, as a result of the higher activity of the amine modified sulfonated lignin, less dispersant is present in the exhaust liquor and waste treatment demands are thereby reduced. The presence of tertiary amine groups in sulfonated kraft, sulfomethylated kraft, and sulfite lignins provide dispersants with package dyeing heat stabilities significantly better than those of the unmodified lignins. The improved package dyeing grinding aid/dispersant of the invention is prepared by reacting sulfonate lignin with a secondary amine using formaldehyde and alkaline conditions.
    Type: Grant
    Filed: March 10, 1998
    Date of Patent: October 26, 1999
    Assignee: Westvaco Corporation
    Inventors: Peter Dilling, Gamini S. Samaranayake, Staci L. Waldrop