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: 11912901Abstract: 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: GrantFiled: December 29, 2021Date of Patent: February 27, 2024Assignee: SWIMC LLCInventors: Gamini S. Samaranayake, Shailesh S. Shah, Joseph J. Kestner, Kimberly A. Koglin, Tom Wendland, Margaret Patterson
-
Patent number: 10676634Abstract: 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: GrantFiled: September 5, 2018Date of Patent: June 9, 2020Assignee: SWIMC LLCInventor: Gamini S Samaranayake
-
Publication number: 20200071559Abstract: 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: ApplicationFiled: September 5, 2018Publication date: March 5, 2020Applicant: THE SHERWIN-WILLIAMS COMPANYInventor: GAMINI S. SAMARANAYAKE
-
Publication number: 20130261222Abstract: 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: ApplicationFiled: March 15, 2013Publication date: October 3, 2013Applicant: THE SHERWIN-WILLIAMS COMPANYInventors: David A. Schiraldi, Gamini S. Samaranayake, Madhukar Rao, Philip J. Ruhoff, Stacey A. Porvasnik
-
Publication number: 20110021734Abstract: 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: ApplicationFiled: July 14, 2010Publication date: January 27, 2011Applicant: THE SHERWIN-WILLIAMS COMPANYInventors: Gamini S. Samaranayake, Richard F. Tomko, Philip J. Ruhoff, Madhukar Rao
-
Publication number: 20100160551Abstract: 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: ApplicationFiled: December 22, 2009Publication date: June 24, 2010Applicant: THE SHERWIN-WILLIAMS COMPANYInventors: James K. Marlow, Paul M. Kayima, Gamini S. Samaranayake, Madhukar Rao
-
Patent number: 6767638Abstract: 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: GrantFiled: November 8, 2002Date of Patent: July 27, 2004Assignee: MeadWestvaco CorporationInventor: Gamini S. Samaranayake
-
Patent number: 6743514Abstract: 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: GrantFiled: March 15, 2002Date of Patent: June 1, 2004Assignee: MeadWestvaco CorporationInventor: Gamini S. Samaranayake
-
Publication number: 20030215604Abstract: 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: ApplicationFiled: November 8, 2002Publication date: November 20, 2003Applicant: Westvaco CorporationInventor: Gamini S. Samaranayake
-
Patent number: 6572969Abstract: 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: GrantFiled: May 16, 2002Date of Patent: June 3, 2003Assignee: MeadWestvaco CorporationInventor: Gamini S. Samaranayake
-
Patent number: 6521343Abstract: 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: GrantFiled: July 12, 2002Date of Patent: February 18, 2003Assignee: Westvaco CorporationInventors: Gamini S. Samaranayake, G. Frederick Hutter, Camille K. Stebbins
-
Publication number: 20020192438Abstract: 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: ApplicationFiled: August 7, 2002Publication date: December 19, 2002Applicant: Westvaco CorporationInventors: G. Frederick Hutter, Camille K. Stebbins, Gamini S. Samaranayake
-
Patent number: 5989299Abstract: 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: GrantFiled: May 26, 1998Date of Patent: November 23, 1999Assignee: Westvaco CorporationInventors: Peter Dilling, Gamini S. Samaranayake
-
Patent number: 5972047Abstract: 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: GrantFiled: March 10, 1998Date of Patent: October 26, 1999Assignee: Westvaco CorporationInventors: Peter Dilling, Gamini S. Samaranayake, Staci L. Waldrop