Patents by Inventor Rajeev S. Mathur

Rajeev S. Mathur 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: 11891754
    Abstract: This invention provides aqueous flame retardant dispersions comprising water, a brominated flame retardant containing aromatically-bound bromine, at least one dispersant, at least one wetting agent, and at least one thickener. The brominated flame retardant has an average particle size of about 20 ?m or less. The flame retardant dispersion contains about 50 wt % or more of brominated polymeric flame retardant, based on the total weight of the dispersion. Also provided are coating compositions, processes for forming flame retardant dispersions, processes for forming coating compositions, and processes for applying the coating compositions to textile substrates.
    Type: Grant
    Filed: March 12, 2019
    Date of Patent: February 6, 2024
    Assignee: Albemarle Corporation
    Inventors: Rajeev S. Mathur, Jon Shannon Reed, Daniel A. De Schryver, John Randall Chaya
  • Publication number: 20230272185
    Abstract: This invention provides a flame retardant additive composition which comprises at least one glow suppressant and at least one brominated flame retardant. The glow suppressant is about 0.5 wt % or more of the flame retardant additive composition, based on the total weight of the flame retardant additive composition. The brominated flame retardant contains aromatically-bound bromine and is selected from a) a brominated anionic styrenic polymer having a number average molecular weight of about 750 to about 7500, and/or a bromine content of about 60 wt % to about 77 wt %, b) a brominated anionic chain transfer vinyl aromatic polymer which contains about 70 wt % or more bromine, or a mixture of any two or more of these. Also provided are flame retarded polyolefin compositions that contain at least one glow suppressant and a brominated flame retardant.
    Type: Application
    Filed: August 5, 2021
    Publication date: August 31, 2023
    Inventors: Jonathan P. McCarney, Daniel A. De Schryver, Rajeev S. Mathur
  • Publication number: 20210131027
    Abstract: This invention provides aqueous flame retardant dispersions comprising water, a brominated flame retardant containing aromatically-bound bromine, at least one dispersant, at least one wetting agent, and at least one thickener. The brominated flame retardant has an average particle size of about 20 ?m or less. The flame retardant dispersion contains about 50 wt % or more of brominated polymeric flame retardant, based on the total weight of the dispersion. Also provided are coating compositions, processes for forming flame retardant dispersions, processes for forming coating compositions, and processes for applying the coating compositions to textile substrates.
    Type: Application
    Filed: March 12, 2019
    Publication date: May 6, 2021
    Inventors: Rajeev S. Mathur, Jon Shannon Reed, Daniel A. De Schryver, John Randall Chaya
  • Patent number: 9834569
    Abstract: This invention provides processes for forming halomagnesium tetrakis(Faryl)borates, which processes comprise bringing together, in an anhydrous liquid organic medium, at least one boron trihalide; at least one Faryl Grignard reagent; and at least one copper compound. Also provided are processes for forming halomagnesium tetrakis(Faryl)borates, which processes comprise bringing together, in an anhydrous liquid organic medium, at least one boron trihalide; at least one copper compound; magnesium metal; and at least one polyhaloaromatic compound.
    Type: Grant
    Filed: July 17, 2017
    Date of Patent: December 5, 2017
    Assignee: ALBEMARLE CORPORATION
    Inventors: Rajeev S. Mathur, Jamie R. Strickler
  • Publication number: 20170313725
    Abstract: This invention provides processes for forming halomagnesium tetrakis(Faryl)borates, which processes comprise bringing together, in an anhydrous liquid organic medium, at least one boron trihalide; at least one Faryl Grignard reagent; and at least one copper compound. Also provided are processes for forming halomagnesium tetrakis(Faryl)borates, which processes comprise bringing together, in an anhydrous liquid organic medium, at least one boron trihalide; at least one copper compound; magnesium metal; and at least one polyhaloaromatic compound.
    Type: Application
    Filed: July 17, 2017
    Publication date: November 2, 2017
    Inventors: Rajeev S. Mathur, Jamie R. Strickler
  • Patent number: 9738662
    Abstract: This invention provides processes for forming halomagnesium tetrakis(Faryl)borates, which processes comprise bringing together, in an anhydrous liquid organic medium, at least one boron trihalide; at least one Faryl Grignard reagent; and at least one copper compound. Also provided are processes for forming halomagnesium tetrakis(Faryl)borates, which processes comprise bringing together, in an anhydrous liquid organic medium, at least one boron trihalide; at least one copper compound; magnesium metal; and at least one polyhaloaromatic compound.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: August 22, 2017
    Assignee: ALBEMARLE CORPORATION
    Inventors: Rajeev S. Mathur, Jamie R. Strickler
  • Publication number: 20150259362
    Abstract: This invention provides processes for forming halomagnesium tetrakis(Faryl)borates, which processes comprise bringing together, in an anhydrous liquid organic medium, at least one boron trihalide; at least one Faryl Grignard reagent; and at least one copper compound. Also provided are processes for forming halomagnesium tetrakis(Faryl)borates, which processes comprise bringing together, in an anhydrous liquid organic medium, at least one boron trihalide; at least one copper compound; magnesium metal; and at least one polyhaloaromatic compound.
    Type: Application
    Filed: November 8, 2013
    Publication date: September 17, 2015
    Inventors: Rajeev S. Mathur, Jamie R. Strickler
  • Patent number: 7871547
    Abstract: This invention provides a process for reducing the amount of soluble halide in a solution comprising a liquid organic medium, at least one viscosity reducing agent, at least one dihydrocarbylmagnesium compound, and an initial amount of soluble halide. The process comprises mixing at least one alkali metal with the solution at a mole ratio of alkali metal to magnesium of less than about 1:2.5, thereby forming precipitated soluble halides. Also provided by this invention is a process for reducing the amount of soluble halide in a slurry comprising a liquid organic medium, at least one viscosity reducing agent, at least one dihydrocarbylmagnesium compound, solids from the formation of said dihydrocarbylmagnesium compound, and an initial amount of soluble halide. This process comprises mixing at least one alkali metal with the slurry at a mole ratio of alkali metal to magnesium of less than about 1:1.25, thereby forming precipitated soluble halides.
    Type: Grant
    Filed: November 12, 2004
    Date of Patent: January 18, 2011
    Assignee: Albemarle Corporation
    Inventors: Milind M. Pradhan, Chi Hung Cheng, Rajeev S. Mathur, Richard A. Holub, Donald W. Imhoff
  • Patent number: 7087780
    Abstract: The liquid ethereal medium or liquid hydrocarbyl medium of a solution or slurry of an alkali metal tetrakis(Faryl)borate is substituted with at least one halogenated hydrocarbon, without isolating the alkali metal tetrakis(Faryl)borate, to form a new slurry or solution. At least a portion of the new solution is mixed together with a salt selected from a) a protic ammonium salt, b) an onium salt, and c) a triarylmethyl salt, to produce a protic ammonium tetrakis(Faryl)borate, an onium tetrakis(Faryl)borate, or a triarylmethyl tetrakis(Faryl)borate.
    Type: Grant
    Filed: June 24, 2004
    Date of Patent: August 8, 2006
    Assignee: Albemarle Corporation
    Inventors: John Y. Lee, Rajeev S. Mathur
  • Patent number: 6831200
    Abstract: The liquid ethereal medium or liquid hydrocarbyl medium of a solution or slurry of an alkali metal tetrakis(Faryl)borate is substituted with at least one halogenated hydrocarbon, without isolating the alkali metal tetrakis(Faryl)borate, to form a new slurry or solution. At least a portion of the new solution is mixed together with a salt selected from a) a protic ammonium salt, b) an onium salt, and c) a triarylmethyl salt, to produce a protic ammonium tetrakis(Faryl)borate, an onium tetrakis(Faryl)borate, or a triarylmethyl tetrakis(Faryl)borate.
    Type: Grant
    Filed: October 3, 2002
    Date of Patent: December 14, 2004
    Assignee: Albemarle Corporation
    Inventors: John Y. Lee, Rajeev S. Mathur
  • Publication number: 20040230075
    Abstract: The liquid ethereal medium or liquid hydrocarbyl medium of a solution or slurry of an alkali metal tetrakis(Faryl)borate is substituted with at least one halogenated hydrocarbon, without isolating the alkali metal tetrakis(Faryl)borate, to form a new slurry or solution. At least a portion of the new solution is mixed together with a salt selected from a) a protic ammonium salt, b) an onium salt, and c) a triarylmethyl salt, to produce a protic ammonium tetrakis(Faryl)borate, an onium tetrakis(Faryl)borate, or a triarylmethyl tetrakis(Faryl)borate.
    Type: Application
    Filed: June 24, 2004
    Publication date: November 18, 2004
    Inventors: John Y. Lee, Rajeev S. Mathur
  • Publication number: 20040068134
    Abstract: The liquid ethereal medium or liquid hydrocarbyl medium of a solution or slurry of an alkali metal tetrakis(Faryl)borate is substituted with at least one halogenated hydrocarbon, without isolating the alkali metal tetrakis(Faryl)borate, to form a new slurry or solution. At least a portion of the new solution is mixed together with a salt selected from a) a protic ammonium salt, b) an onium salt, and c) a triarylmethyl salt, to produce a protic ammonium tetrakis(Faryl)borate, an onium tetrakis(Faryl)borate, or a triarylmethyl tetrakis(Faryl)borate.
    Type: Application
    Filed: October 3, 2002
    Publication date: April 8, 2004
    Inventors: John Y. Lee, Rajeev S. Mathur
  • Patent number: 6084117
    Abstract: Lithiated haloarenes, although useful as intermediates in the synthesis of various end products, can be hazardous to prepare since unstable, shock sensitive compounds can be formed during lithiation of haloarenes. To avoid this problem, a reaction of a polyhaloarene with a hydrocarbyl lithium compound is conducted in the presence of another reactant so that the lithiated haloarene, if formed at all, exists as a transitory intermediate in low concentration. In this way, transitory lithiated haloarene which may be, and presumably is, formed in the reaction is converted into a non-hazardous functionally-substituted haloarene essentially as soon as such lithiated haloarene is formed. Thus, an arene having a halogen atom of atomic number greater than 9 substituted on at least two non-adjacent carbon atoms is concurrently reacted with a non-fluoro halotrihydrocarbylsilane and a hydrocarbyl lithium compound, in proportions such that a haloarene having at least one trihydrocarbylsilyl ring substituent is formed.
    Type: Grant
    Filed: November 22, 1999
    Date of Patent: July 4, 2000
    Assignee: Albemarle Corporation
    Inventors: Bruce C. Berris, David W. Owens, Rajeev S. Mathur