Patents by Inventor Dipti Dilip Khasnis
Dipti Dilip Khasnis 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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Publication number: 20240002553Abstract: A process for polymerizing at least one fluoromonomer in an aqueous medium containing initiator and hydrocarbon dispersing agent to form an aqueous dispersion of particles of fluoropolymer. The hydrocarbon dispersing agent comprises a compound of formula I: R—(XZ)n??I wherein R is a hydrophobic hydrocarbon moiety that comprises one or more saturated or unsaturated, non-cyclic or cyclic aliphatic groups, the percentage of total CH3 groups in relation to the total of CH3, CH2 and CH groups in said one or more aliphatic groups being at least about 70%, said hydrophobic moiety being free of siloxane units; wherein each X may be the same or different and represents an ionic hydrophilic moiety; wherein each Z may be a same or different and represents one or more counter ions for said ionic hydrophilic moiety; and wherein n is 1 to 3.Type: ApplicationFiled: September 30, 2021Publication date: January 4, 2024Applicant: THE CHEMOURS COMPANY FC, LLCInventors: PHAN LINH TANG, MICHAEL DEEMER, VINCENT FRANCO, STEVEN FURYK, STEPHEN JAMES GETTY, DIPTI DILIP KHASNIS, XIAOLIN LIU, ALEXANDER ANTHONY MARCHIONE, ANDRII MATSNEV, BENJAMIN WEAVER MESSMORE, PETER A. MORKEN, CAMERON PARRISH, ADAM PAUL SMITH, EDWARD PATRICK CAREY
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Patent number: 11655312Abstract: A process is provided for the polymerization of fluoromonomer to an dispersion of fluoropolymer particles in an aqueous medium in a polymerization reactor, by (a) providing the aqueous medium in the reactor, (b) adding the fluoromonomer to the reactor, (c) adding initiator to the aqueous medium, the combination of steps (b) and (c) being carried out essentially free of hydrocarbon-containing surfactant and resulting in the kickoff of the polymerization of the fluoromonomer, and (d) metering hydrocarbon-containing surfactant into the aqueous medium after the kickoff of polymerization, e.g. after the concentration of the fluoropolymer in the aqueous medium is at least 0.6 wt %, the metering being at a rate reducing the telogenic activity of said surfactant while maintaining surface activity.Type: GrantFiled: June 1, 2020Date of Patent: May 23, 2023Assignee: THE CHEMOURS COMPANY FC, LLCInventors: Paul Douglas Brothers, Subhash Vishnu Gangal, Dipti Dilip Khasnis
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Publication number: 20200291141Abstract: A process is provided for the polymerization of fluoromonomer to an dispersion of fluoropolymer particles in an aqueous medium in a polymerization reactor, by (a) providing the aqueous medium in the reactor, (b) adding the fluoromonomer to the reactor, (c) adding initiator to the aqueous medium, the combination of steps (b) and (c) being carried out essentially free of hydrocarbon-containing surfactant and resulting in the kickoff of the polymerization of the fluoromonomer, and (d) metering hydrocarbon-containing surfactant into the aqueous medium after the kickoff of polymerization, e.g. after the concentration of the fluoropolymer in the aqueous medium is at least 0.6 wt %, the metering being at a rate reducing the telogenic activity of said surfactant while maintaining surface activity.Type: ApplicationFiled: June 1, 2020Publication date: September 17, 2020Applicant: THE CHEMOURS COMPANY FC, LLCInventors: PAUL DOUGLAS BROTHERS, SUBHASH VISHNU GANGAL, DIPTI DILIP KHASNIS
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Patent number: 10703829Abstract: A process is provided for the polymerization of fluoromonomer to an dispersion of fluoropolymer particles in an aqueous medium in a polymerization reactor, by (a) providing the aqueous medium in the reactor, (b) adding the fluoromonomer to the reactor, (c) adding initiator to the aqueous medium, the combination of steps (b) and (c) being carried out essentially free of hydrocarbon-containing surfactant and resulting in the kickoff of the polymerization of the fluoromonomer, and (d) metering hydrocarbon-containing surfactant into the aqueous medium after the kickoff of polymerization, e.g. after the concentration of the fluoropolymer in the aqueous medium is at least 0.6 wt %, the metering being at a rate reducing the telogenic activity of said surfactant while maintaining surface activity.Type: GrantFiled: November 3, 2016Date of Patent: July 7, 2020Assignee: THE CHEMOURS COMPANY FC, LLCInventors: Paul Douglas Brothers, Subhash Vishnu Gangal, Dipti Dilip Khasnis
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Patent number: 9676929Abstract: Process for polymerizing fluoromonomer to form an aqueous dispersion of fluoropolymer particles including: (a) providing an aqueous medium in a polymerization reactor, (b) adding nucleating additive comprising polyalkylene oxide having a number average molecular weight of about 50 to about 2000 to the aqueous medium in an amount of about 0.1 ppm to about 50 ppm based on water in the aqueous medium, (c) exposing the nucleating additive to oxidizing agent to form a dispersion of oleophilic nucleation sites in the aqueous medium; (d) pressurizing the reactor by adding fluoromonomer, and (e) adding polymerization initiator to the aqueous medium to cause the polymerizing of the fluoromonomer to form fluoropolymer particles dispersed in the aqueous medium.Type: GrantFiled: November 25, 2014Date of Patent: June 13, 2017Assignee: THE CHEMOURS COMPANY FC, LLCInventors: Paul Douglas Brothers, Subhash Vishnu Gangal, Dipti Dilip Khasnis
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Publication number: 20170073435Abstract: A process is provided for the polymerization of fluoromonomer to an dispersion of fluoropolymer particles in an aqueous medium in a polymerization reactor, by (a) providing the aqueous medium in the reactor, (b) adding the fluoromonomer to the reactor, (c) adding initiator to the aqueous medium, the combination of steps (b) and (c) being carried out essentially free of hydrocarbon-containing surfactant and resulting in the kickoff of the polymerization of the fluoromonomer, and (d) metering hydrocarbon-containing surfactant into the aqueous medium after the kickoff of polymerization, e.g. after the concentration of the fluoropolymer in the aqueous medium is at least 0.6 wt %, the metering being at a rate reducing the telogenic activity of said surfactant while maintaining surface activity.Type: ApplicationFiled: November 3, 2016Publication date: March 16, 2017Inventors: PAUL DOUGLAS BROTHERS, SUBHASH VISHNU GANGAL, DIPTI DILIP KHASNIS
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Patent number: 9518170Abstract: A process is provided for the polymerization of fluoromonomer to an dispersion of fluoropolymer particles in an aqueous medium in a polymerization reactor, by (a) providing the aqueous medium in the reactor, (b) adding the fluoromonomer to the reactor, (c) adding initiator to the aqueous medium, the combination of steps (b) and (c) being carried out essentially free of hydrocarbon-containing surfactant and resulting in the kickoff of the polymerization of the fluoromonomer, and (d) metering hydrocarbon-containing surfactant into the aqueous medium after the kickoff of polymerization, e.g. after the concentration of the fluoropolymer in the aqueous medium is at least 0.6 wt %, the metering being at a rate reducing the telogenic activity of said surfactant while maintaining surface activity.Type: GrantFiled: January 11, 2016Date of Patent: December 13, 2016Assignee: THE CHEMOURS COMPANY FC, LLCInventors: Paul Douglas Brothers, Subhash Vishnu Gangal, Dipti Dilip Khasnis
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Patent number: 9371405Abstract: A process is provided for polymerizing fluoromonomer in an aqueous medium, wherein a dispersion of essentially surfactant-free hydrocarbon-containing oleophilic nucleation sites is first formed in the aqueous medium, and then polymerization is commenced to form a dispersion of fluoropolymer particles at the oleophilic nucleation sites, wherein the nucleation sites can be derived from hydrocarbon-containing compound. The surfactant used to stabilize the fluoropolymer dispersion can also be hydrocarbon-containing.Type: GrantFiled: September 19, 2013Date of Patent: June 21, 2016Assignee: THE CHEMOURS COMPANY FC, LLCInventors: Paul Douglas Brothers, Subhash Vishnu Gangal, Dipti Dilip Khasnis
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Publication number: 20160122509Abstract: A process is provided for the polymerization of fluoromonomer to an dispersion of fluoropolymer particles in an aqueous medium in a polymerization reactor, by (a) providing the aqueous medium in the reactor, (b) adding the fluoromonomer to the reactor, (c) adding initiator to the aqueous medium, the combination of steps (b) and (c) being carried out essentially free of hydrocarbon-containing surfactant and resulting in the kickoff of the polymerization of the fluoromonomer, and (d) metering hydrocarbon-containing surfactant into the aqueous medium after the kickoff of polymerization, e.g. after the concentration of the fluoropolymer in the aqueous medium is at least 0.6 wt %, the metering being at a rate reducing the telogenic activity of said surfactant while maintaining surface activity.Type: ApplicationFiled: January 11, 2016Publication date: May 5, 2016Inventors: PAUL DOUGLAS BROTHERS, SUBHASH VISHNU GANGAL, DIPTI DILIP KHASNIS
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Patent number: 9255164Abstract: A process is provided for the polymerization of fluoromonomer to an dispersion of fluoropolymer particles in an aqueous medium in a polymerization reactor, by (a) providing the aqueous medium in the reactor, (b) adding the fluoromonomer to the reactor, (c) adding initiator to the aqueous medium, the combination of steps (b) and (c) being carried out essentially free of hydrocarbon-containing surfactant and resulting in the kickoff of the polymerization of the fluoromonomer, and (d) metering hydrocarbon-containing surfactant into the aqueous medium after the kickoff of polymerization, e.g. after the concentration of the fluoropolymer in the aqueous medium is at least 0.6 wt %, the metering being at a rate reducing the telogenic activity of said surfactant while maintaining surface activity.Type: GrantFiled: November 9, 2011Date of Patent: February 9, 2016Assignee: THE CHEMOURS COMPANY FC, LLCInventors: Paul Douglas Brothers, Subhash Vishnu Gangal, Dipti Dilip Khasnis
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Publication number: 20150344592Abstract: A process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from the aqueous medium to obtain the fluoropolymer resin. The process comprises exposing the aqueous fluoropolymer dispersion to oxidizing agent.Type: ApplicationFiled: August 7, 2015Publication date: December 3, 2015Inventors: PAUL DOUGLAS BROTHERS, HEIDI ELIZABETH BURCH, GREGORY ALLEN CHAPMAN, SUBHASH VISHNU GANGAL, DIPTI DILIP KHASNIS, ADAM PAUL SMITH
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Patent number: 9074025Abstract: A polymerization process is provided, comprising polymerizing fluoromonomer in an aqueous medium to form a dispersion of fluoropolymer particles in the aqueous medium, said polymerizing being carried out in the presence of (i) polymerization initiator, and (ii) hydrocarbon-containing surfactant stabilizing the dispersion of fluoropolymer particles, the hydrocarbon-containing surfactant being passivated to reduce its the telogenic behavior.Type: GrantFiled: November 9, 2011Date of Patent: July 7, 2015Assignee: THE CHEMOURS COMPANY FC, LLCInventors: Paul Douglas Brothers, Subhash Vishnu Gangal, Dipti Dilip Khasnis
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Publication number: 20150148481Abstract: Process for polymerizing fluoromonomer to form an aqueous dispersion of fluoropolymer particles including: (a) providing an aqueous medium in a polymerization reactor, (b) adding nucleating additive comprising polyalkylene oxide having a number average molecular weight of about 50 to about 2000 to the aqueous medium in an amount of about 0.1 ppm to about 50 ppm based on water in the aqueous medium, (c) exposing the nucleating additive to oxidizing agent to form a dispersion of oleophilic nucleation sites in the aqueous medium; (d) pressurizing the reactor by adding fluoromonomer, and (e) adding polymerization initiator to the aqueous medium to cause the polymerizing of the fluoromonomer to form fluoropolymer particles dispersed in the aqueous medium.Type: ApplicationFiled: November 25, 2014Publication date: May 28, 2015Inventors: PAUL DOUGLAS BROTHERS, Subhash Vishnu Gangal, Dipti Dilip Khasnis
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Patent number: 8785516Abstract: Process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from said aqueous medium to obtain said fluoropolymer resin. The process comprises exposing the aqueous fluoropolymer dispersion to ultraviolet light in the presence of an oxygen source.Type: GrantFiled: May 2, 2013Date of Patent: July 22, 2014Assignee: E I du Pont de Nemours and CompanyInventors: Paul Douglas Brothers, Gregory Allen Chapman, Subhash Vishnu Gangal, Dipti Dilip Khasnis, Adam Paul Smith
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Publication number: 20140018499Abstract: A process is provided for polymerizing fluoromonomer in an aqueous medium, wherein a dispersion of essentially surfactant-free hydrocarbon-containing oleophilic nucleation sites is first formed in the aqueous medium, and then polymerization is commenced to form a dispersion of fluoropolymer particles at the oleophilic nucleation sites, wherein the nucleation sites can be derived from hydrocarbon-containing compound. The surfactant used to stabilize the fluoropolymer dispersion can also be hydrocarbon-containing.Type: ApplicationFiled: September 19, 2013Publication date: January 16, 2014Applicant: E I DU PONT DE NEMOURS AND COMPANYInventors: PAUL DOUGLAS BROTHERS, SUBHASH VISHNU GANGAL, DIPTI DILIP KHASNIS
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Publication number: 20130303710Abstract: Process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from said aqueous medium to obtain said fluoropolymer resin. The process comprises: exposing the aqueous fluoropolymer dispersion to hydrogen peroxide.Type: ApplicationFiled: May 2, 2013Publication date: November 14, 2013Applicant: E I DU PONT DE NEMOURS AND COMPANYInventors: Paul Douglas Brothers, Heidi Elizabeth Burch, Gregory Allen Chapman, Subhash Vishnu Gangal, Dipti Dilip Khasnis
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Publication number: 20130303708Abstract: Process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from said aqueous medium to obtain said fluoropolymer resin. The process comprises: exposing the aqueous fluoropolymer dispersion to oxidizing agent selected from the group consisting of hypochlorite salts and nitrite salts.Type: ApplicationFiled: May 2, 2013Publication date: November 14, 2013Applicant: E I DU PONT DE NEMOURS AND COMPANYInventors: Paul Douglas Brothers, Gregory Allen Chapman, Subhash Vishnu Gangal, Dipti Dilip Khasnis, Adam Paul Smith
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Publication number: 20130303652Abstract: Process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from said aqueous medium to obtain said fluoropolymer resin. The process comprises: exposing the aqueous fluoropolymer dispersion to light having a wavelength of 10 nm to 760 nm in the presence of an oxygen source and photocatalyst.Type: ApplicationFiled: May 2, 2013Publication date: November 14, 2013Applicant: E I DU PONT DE NEMOURS AND COMPANYInventors: Paul Douglas Brothers, Gregory Allen Chapman, Subhash Vishnu Gangal, Dipti Dilip Khasnis
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Publication number: 20130303718Abstract: A process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from the aqueous medium to obtain the fluoropolymer resin. The process comprises: exposing the aqueous fluoropolymer dispersion to oxidizing agent.Type: ApplicationFiled: May 2, 2013Publication date: November 14, 2013Applicant: E I DU PONT DE NEMOURS AND COMPANYInventors: Paul Douglas Brothers, Heidi Elizabeth Burch, Gregory Allen Chapman, Subhash Vishnu Gangal, Dipti Dilip Khasnis, Adam Paul Smith
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Publication number: 20130303717Abstract: A process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from the aqueous medium to obtain the fluoropolymer resin. The process comprises: exposing the aqueous fluoropolymer dispersion to oxidizing agent.Type: ApplicationFiled: May 2, 2013Publication date: November 14, 2013Applicant: E I DU PONT DE NEMOURS AND COMPANYInventors: Paul Douglas Brothers, Heidi Elizabeth Burch, Gregory Allen Chapman, Subhash Vishnu Gangal, Dipti Dilip Khasnis, Adam Paul Smith