Patents by Inventor Rajat Duggal
Rajat Duggal 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).
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Patent number: 9371416Abstract: An epoxy terminated prepolymer formed as a reaction product of a cycloaliphatic epoxide resin and an amine terminated polymeric polyol, and a catalyst that promotes the reaction of the cycloaliphatic epoxide resin and the aminated polyol. The epoxy terminated prepolymer and an anhydride hardener react to form an epoxy elastomer composition having a microphase separated morphology of hard particles, formed with the anhydride hardener reacted with the epoxy terminated prepolymer, dispersed in a soft continuous phase formed from polymeric polyol in the epoxy terminated prepolymer.Type: GrantFiled: December 20, 2012Date of Patent: June 21, 2016Assignee: Dow Global Technologies LLCInventors: Kwanho Chang, Harshad M Shah, Rajat Duggal
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Publication number: 20160153559Abstract: A method for forming a piston seal of a hydraulic pump includes forming a reaction mixture that includes a prepolymer component, a polyol additive, a diol component, and a curative component, forming a sealing element with the reaction mixture and a mold, and curing the sealing element to form a piston seal of a hydraulic pump. The prepolymer component includes a polycarbonate-isocyanate prepolymer that is a reaction product of at least an isocyanate component and a polycarbonate polyol component.Type: ApplicationFiled: August 14, 2014Publication date: June 2, 2016Inventors: Rajat Duggal, Subodh P. Jagtap
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Patent number: 9340639Abstract: Polyisocyanate-based polymers are formed by curing a reaction mixture containing at least one polyisocyanate and at least one isocyanate-reactive compound having at least two isocyanate-reactive groups in the presence of a bismuth thiophosphoric acid diester salt.Type: GrantFiled: March 26, 2013Date of Patent: May 17, 2016Assignee: Dow Global Technologies LLCInventors: Richard J. Keaton, Peter M. Margl, Rajat Duggal, Scott D. Boelter, Duane R. Romer, Debra L. Nowlin, Nathan Wilmot, David R. Wilson, Dean M. Welsh
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Publication number: 20150376326Abstract: Polyisocyanate-based polymers are formed by curing a reaction mixture containing at least one polyisocyanate and at least one isocyanate-reactive compound having at least two isocyanate-reactive groups in the presence of a zinc catalyst that contains at least one zinc atom associated with a polydentate ligand that contains at least one nitrogen-containing complexing site.Type: ApplicationFiled: September 9, 2015Publication date: December 31, 2015Inventors: Richard Keaton, Peter Margl, Duane Romer, Nathan Wilmot, Rajat Duggal, Rashmi Chamsarkar
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Patent number: 9221941Abstract: Polyurethane elastomers are formed by curing a reaction mixture containing at least one polyisocyanate at least one polyol, an aliphatic diol chain extender and a small amount of a secondary amino compound that may have none or one or more hydroxyl groups. The reaction is catalyzed with a metal catalyst. In certain embodiments, the catalyst is an organozirconium, organotitanium or tertiary amine-based catalyst. The presence of the secondary amine compound in those cases provides for a good surface appearance and good physical properties.Type: GrantFiled: November 16, 2011Date of Patent: December 29, 2015Assignee: Dow Global Technologies LLCInventors: Rajat Duggal, Nathan Wilmot, Richard Keaton, Alan K. Schrock
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Patent number: 9181428Abstract: Moisture curable compositions including silylated polymers and methods for producing the same are provided. A two component moisture curable system for producing a cured or cross-linked silylated polymer having improved compression set properties is provided. The two component system comprises a first formulation and a second formulation. The first formulation comprises a silylated polymer, water, and filler and the second formulation comprises the silylated polymer, a curing catalyst comprising at least one Brønsted acid, and a moisture scavenger. The final cured formulation may have a compression set, determined by ASTM D395 or ISO 815-1, of less than 100%, and in some examples less than 50% and in some examples less than 15%. This demonstrated improvement in compression set not only allows the silylated polymers to be used in applications where cyclic loads are applied but also enhances product durability.Type: GrantFiled: September 17, 2012Date of Patent: November 10, 2015Assignee: Dow Global Technologies LLCInventors: Kamesh R. Vyakaranam, Ling Zhang, Venkat S. Minnikanti, Dwight Latham, Sara Arshad, Rajat Duggal, William A. Koonce
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Publication number: 20150307651Abstract: An epoxy composition that includes an epoxy-terminated prepolymer, an alkanolamine hardener having at least one hydroxyl group and an organometallic compound, where amine groups of the alkanolamine hardener react with epoxy groups of the epoxy-terminated prepolymer in a stoichiometric ratio to form a cured epoxy composition. The epoxy-terminated prepolymer is formed from a reaction product of an amine terminated polymeric polyol and a molar excess of epoxy groups in an epoxy monomer, relative to a molar amount of amine groups in the amine terminated polymeric polyol.Type: ApplicationFiled: December 13, 2013Publication date: October 29, 2015Applicant: Dow Global Technologies LLCInventors: Kwanho Chang, Jia Xie, Shouren Ge, Nathan Wilmot, Rajat Duggal
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Patent number: 9156935Abstract: Polyisocyanate-based polymers are formed by curing a reaction mixture containing at least one polyisocyanate and at least one isocyanate-reactive compound having at least two isocyanate-reactive groups in the presence of a zinc catalyst that contains at least one zinc atom associated with a polydentate ligand that contains at least one nitrogen-containing complexing site.Type: GrantFiled: July 5, 2011Date of Patent: October 13, 2015Assignee: Dow Global Technologies LLCInventors: Richard J. Keaton, Peter M. Margl, Duane R. Romer, Nathan Wilmot, Rajat Duggal, Rashmi Chamsarkar
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Publication number: 20150259466Abstract: An amine endcapped adduct composition including an amine endcapped adduct formed from a monofunctional epoxide and a polyether amine. The monofunctional epoxide and the polyether amine are combined in a molar ratio of 1.0:2.0 to 1.0:8.0 moles of epoxide functionalities to moles of polyether amine functionalities.Type: ApplicationFiled: September 24, 2013Publication date: September 17, 2015Applicant: Dow Global Technologies LLCInventors: Angela I. Padilla-Acevedo, Nathan Wilmot, Rajat Duggal, Harshad M. Shah, Kwanho Chang
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Publication number: 20150246993Abstract: Polyisocyanate-based polymers are formed by curing a reaction mixture containing at least one polyisocyanate and at least one isocyanate-reactive compound having at least two isocyanate-reactive groups in the presence of a copper catalyst that contains at least one copper atom associated with a polydentate ligand that contains at least one nitrogen-containing complexing site.Type: ApplicationFiled: May 12, 2015Publication date: September 3, 2015Inventors: Richard Keaton, Peter M. Margl, Duane R. Romer, Nathan Wilmot, Rajat Duggal, Rashmi Chamsarkar
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Patent number: 9035012Abstract: Polyisocyanate-based polymers are formed by curing a reaction mixture containing at least one polyisocyanate and at least one isocyanate-reactive compound having at least two isocyanate-reactive groups in the presence of a copper catalyst that contains at least one copper atom associated with a polydentate ligand that contains at least one nitrogen-containing complexing site.Type: GrantFiled: July 5, 2011Date of Patent: May 19, 2015Assignee: Dow Global Technologies LLCInventors: Richard Keaton, Peter M. Margl, Duane R. Romer, Nathan Wilmot, Rajat Duggal, Rashmi Chamsarkar
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Patent number: 9006385Abstract: Thermoset elastomer compositions are disclosed. Such elastomers are the reaction product of (a) an ambient temperature liquid epoxy-terminated prepolymer formed by reacting a polyoxyalkyleneamine having a molecular weight of from 3000 to 20,000 with an excess of epoxide, wherein the polyoxyalkyleneamine has at least 3 active hydrogen atoms and (b) a curing agent comprising at least one amine or polyamine having an equivalent weight of less than 200 and having 2 to 5 active hydrogen atoms. Such elastomers can be used in applications such as for sealants, adhesives, coatings, gaskets, jointing and cast elastomers.Type: GrantFiled: August 31, 2011Date of Patent: April 14, 2015Assignee: Dow Global Technologies LLCInventors: Nathan Wilmot, Rajat Duggal, Juan Carlos Medina, Harshad M. Shah, Alan K. Schrock
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Publication number: 20150087737Abstract: A reaction system for forming a hydrophilic polyurethane foam for liquid based cleaning applications includes a composition that has a prepolymer component and an aqueous component. The prepolymer component is a reaction product of an isocyanate component that includes diphenylemethane diisocyanate (MDI) and a polyol component that includes a polyoxyethylene-polyoxypropylene polyol that has an polyoxyethylene content greater than 65 wt %, based on a total weight of the polyoxyethylene-polyoxypropylene polyol. The aqueous component includes at least 60 wt % of water and at least 0.5 wt % of a surfactant, based on a total weight of the aqueous component. A weight ratio of the prepolymer component to the aqueous component in the composition is from 0.5:2 to 2:0.5, the composition has a cream time of less than 20 seconds and a tack free time of less than 7 minutes, and the hydrophilic polyurethane foam for liquid based cleaning applications has a wet tear strength of at least 500 N/m.Type: ApplicationFiled: September 18, 2014Publication date: March 26, 2015Inventors: Yasmin N. Srivastava, Subodh P. Jagtap, Venkat S. Minnikanti, Rogelio Gamboa, Dwight Latham, Rajat Duggal
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Patent number: 8987401Abstract: Methods of producing a composition comprising a crosslinkable silane-terminated polymer having at least one crosslinkable silyl group in each molecule are provided.Type: GrantFiled: June 14, 2012Date of Patent: March 24, 2015Assignee: Dow Global Technologies LLCInventors: Kamesh R. Vyakaranam, Ling Zhang, Venkat S. Minnikanti, Rajat Duggal, William A. Koonce, Amarnath Singh, Phillip S. Athey
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Publication number: 20150073065Abstract: Polyisocyanate-based polymers are formed by curing a reaction mixture containing at least one polyisocyanate and at least one isocyanate-reactive compound having at least two isocyanate-reactive groups in the presence of a bismuth thiophosphoric acid diester salt.Type: ApplicationFiled: March 26, 2013Publication date: March 12, 2015Inventors: Richard J. Keaton, Peter M. Margl, Rajat Duggal, Scott D. Boelter, Duane R. Romer, Debra L. Nowlin, Nathan Wilmot, David R. Wilson, Dean M. Welsh
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Publication number: 20150065675Abstract: Polyisocyanate-based polymers are formed by curing a reaction mixture containing at least one polyisocyanate and at least one isocyanate-reactive compound having at least two isocyanate-reactive groups in the presence of a bismuth mono- or dithiocarbamate or mono- or dithiocarbonate salt.Type: ApplicationFiled: March 26, 2013Publication date: March 5, 2015Inventors: Richard J. Keaton, Peter M. Margl, Rajat Duggal, Scott D. Boelter, Duane R. Romer, Nathan Wilmot
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Patent number: 8951619Abstract: The invention provides an insulation material comprising an epoxy-terminated prepolymer and an amine curing agent. The reaction production of the epoxy-terminated prepolymer and amine curing agent provides for an elastomer that combines the processing and mechanical properties of polyurethane elastomers with improved thermal-hydrolytic stability. The insulation material is particularly useful as thermal insulation and coating for subsea oil and gas applications.Type: GrantFiled: August 31, 2011Date of Patent: February 10, 2015Assignee: Dow Global Technologies LLCInventors: Nathan Wilmot, Rajat Duggal, Harshad M. Shah, Alan K. Schrock, Juan Carlos Medina
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Publication number: 20150011722Abstract: Embodiments of the invention provide for methods of producing a composition comprising a crosslinkable silane-terminated polymer having at least one crosslinkable silyl group in each molecule. The method comprises providing a polymer having at least one unsaturated group and at least one alcoholic hydroxyl group in each molecule, adding to the polymer a compound having a hydrogen-silicon bond and a crosslinkable silyl group in each molecule and a hydrosilylation catalyst to thereby carry out a hydrosilylation reaction to form a composition comprising hydrosilylated polyoxyalkylene polymers, reacting the hydrosilylated polyoxyalkylene polymers with at least one isocyanate in the presence of a first tin-free catalyst to form an isocyanate reacted hydrosilylated polymer, and optionally reacting the isocyanate reacted hydrosilylated polymer with a polyol having a nominal functionality of at least 2 to form a polyol reacted crosslinkable silane-terminated polymer.Type: ApplicationFiled: September 25, 2014Publication date: January 8, 2015Inventors: Kamesh R. Vyakaranam, Ling Zhang, William A. Koonce, Juan Carlos Medina, Ganesh Kailasam, Rajat Duggal, Nathan Wilmot
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Publication number: 20140357802Abstract: An epoxy thermoset that includes a reaction product of a toughening agent prepared from a reaction of a first epoxy resin and a polyether polyamine, a second epoxy resin and a liquid amine hardener for the toughening agent and the second epoxy resin. The toughening agent is an adduct of the second epoxy resin and the polyether polyamine. The polyether polyamine phase of the toughening agent separates to form particles in the epoxy thermoset, where the particles have a volume average diameter in a range from 20 nanometers to 200 nanometers.Type: ApplicationFiled: December 19, 2012Publication date: December 4, 2014Applicant: Dow Global Technologies LLcInventors: Kaoru Aou, Rajat Duggal, Marvin L. Dettloff, Theofanis Theofanous, Eddy Garcia-Meitin, Nikhil Verghese
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Publication number: 20140357813Abstract: An epoxy terminated prepolymer formed as a reaction product of a cycloaliphatic epoxide resin and an amine terminated polymeric polyol, and a catalyst that promotes the reaction of the cycloaliphatic epoxide resin and the aminated polyol. The epoxy terminated prepolymer and an anhydride hardener react to form an epoxy elastomer composition having a microphase separated morphology of hard particles, formed with the anhydride hardener reacted with the epoxy terminated prepolymer, dispersed in a soft continuous phase formed from polymeric polyol in the epoxy terminated prepolymer.Type: ApplicationFiled: December 20, 2012Publication date: December 4, 2014Applicant: Dow Global Technologies LLCInventors: Kwanho Chang, Harshad M. Shah, Rajat Duggal