Patents by Inventor Leo Zhaoqing Liu
Leo Zhaoqing Liu 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: 20240141115Abstract: A fast-hydrating polyacrylamide solid in the shape of microplates is provided and the process to make the microplates. The microplates can be treated with any processing and/or functional substances to facilitate the dissolution process or/and to import functional properties to the said solid.Type: ApplicationFiled: November 2, 2023Publication date: May 2, 2024Applicant: SOLENIS TECHNOLOGIES, L.P.Inventor: Leo Zhaoqing Liu
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Patent number: 8889653Abstract: A method of grafting galactomannan-type polysaccharide polymers, preferably guar, to a functional group by irradiation with high energy electron beams in the presence of an unsaturated monomer-compressing the described functional group. The method may include the depolymerization of the grafted polymer to a pre-selected low molecular weight. The preferred galactomannans for treatment according to this method are guar gum, guar splits and hydroxypropyl guar. In a preferred embodiment the guar gum is also depolymerized, preferably to a molecular weight of below about 700,000 Daltons, and most preferably to a molecular weight of between about 100,000 Daltons to about 250,000 Daltons. The depolymerized guar most preferably has a polydispersity of less than about 3.0 and is useful in oil well fracturing to enhance oil production.Type: GrantFiled: November 22, 2010Date of Patent: November 18, 2014Assignee: Rhodia, Inc.Inventors: Leo Zhaoqing Liu, Christian Priou
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Patent number: 8796487Abstract: An improved process for production of dialkyldithiophosphinic acid including sulfurizing a purified dialkylphosphinic acid by: reacting a hypophosphorous acid or salt with a stoichiometric excess of an alpha olefin in the presence of a free radical initiator to form a reaction product comprising monoalkylphosphinic acid and dialkylphosphinic acid; adding sufficient aqueous base to the reaction product to i) form the salts of the phosphinic acids, and ii) establish an aqueous phase and an organic phase, wherein a monoalkylphosphinic acid solubilizes into an aqueous phase; separating the organic phase from the aqueous phase; acidifying the organic phase and removing the olefin from the organic phase; isolating the purified dialkylphosphinic acid product; and sulfurizing the purified dialkylphosphinic acid product to form a dialkydithiophosphinic acid.Type: GrantFiled: June 8, 2009Date of Patent: August 5, 2014Assignee: Rhodia OperationsInventors: Leo Zhaoqing Liu, Gary Woodward
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Patent number: 8258342Abstract: A method for making a (meth)acrylamide monomer, comprises reacting a (meth)acrylate ester with an amino-functional compound in an organic solvent in the presence of a transesterification catalyst.Type: GrantFiled: March 19, 2008Date of Patent: September 4, 2012Assignee: Rhodia OperationsInventor: Leo Zhaoqing Liu
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Patent number: 8119733Abstract: A polymer network, comprises an interfacially polymerized reaction product derived from a surfactant monomer.Type: GrantFiled: March 28, 2007Date of Patent: February 21, 2012Assignee: Rhodia OperationsInventor: Leo Zhaoqing Liu
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Publication number: 20110137004Abstract: A method of grafting galactomannan-type polysaccharide polymers, preferably guar, to a functional group by irradiation with high energy electron beams in the presence of an unsaturated monomer-compressing the described functional group. The method may include the depolymerization of the grafted polymer to a pre-selected low molecular weight. The preferred galactomannans for treatment according to this method are guar gum, guar splits and hydroxypropyl guar. In a preferred embodiment the guar gum is also depolymerized, preferably to a molecular weight of below about 700,00 Daltons, and most preferably to a molecular weight of between about 100,00 Daltons to about 250,00 Daltons. The depolymerized guar most preferably has a polydispersity of less than about 3.0 and is useful in oil well fracturing to enhance oil production.Type: ApplicationFiled: November 22, 2010Publication date: June 9, 2011Applicant: RHODIA, INC.Inventors: Leo Zhaoqing LIU, Christian PRIOU
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Process for making an acrylic monomer having one or more quaternary ammonium groups and its polymers
Patent number: 7858722Abstract: A method for making a monomer having an ethylenically unsaturated group and two or more quaternary ammonium groups per molecule, comprising: (a) reacting an excess of a monomeric reactant having at least one ethylenically unsaturated group and at least one tertiary amino group per molecule with a halohydroxyalkyl(trialkyl)quaternary ammonium salt, in an aqueous medium, (b) monitoring the pH of the aqueous medium from at least as early as the time when all reactants have been added to aqueous medium until completion of the reaction, and (c) adjusting the pH of the aqueous medium to and maintaining the pH of the aqueous medium at a value greater than or equal to 9, from the time, after all reactants have been added to aqueous medium, that the reaction mixture exhibits an apparent pH minimum until completion of the reaction.Type: GrantFiled: March 19, 2008Date of Patent: December 28, 2010Assignee: Rhodia Inc.Inventors: Leo Zhaoqing Liu, Jon D. Kiplinger, Douglas Radtke -
Patent number: 7838667Abstract: A method of grafting galactomannan-type polysaccharide polymers, preferably guar, to a functional group by irradiation with high energy electron beams in the presence of an unsaturated monomer-compressing the described functional group. The method may include the depolymerization of the grafted polymer to a pre-selected low molecular weight. The preferred galactomannans for treatment according to this method are guar gum, guar splits and hydroxypropyl guar. In a preferred embodiment the guar gum is also depolymerized, preferably to a molecular weight of below about 700,000 Daltons, and most preferably to a molecular weight of between about 100,000 Daltons to about 250,000 Daltons. The depolymerized guar most preferably has a polydispersity of less than about 3.0 and is useful in oil well fracturing to enhance oil production.Type: GrantFiled: June 25, 2003Date of Patent: November 23, 2010Assignee: Rhodia, Inc.Inventors: Leo Zhaoqing Liu, Christian Priou
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Publication number: 20090253931Abstract: An improved process for production of dialkyldithiophosphinic acid including sulfurizing a purified dialkylphosphinic acid by: reacting a hypophosphorous acid or salt with a stoichiometric excess of an alpha olefin in the presence of a free radical initiator to form a reaction product comprising monoalkylphosphinic acid and dialkylphosphinic acid; adding sufficient aqueous base to the reaction product to i) form the salts of the phosphinic acids, and ii) establish an aqueous phase and an organic phase, wherein a monoalkylphosphinic acid solubilizes into an aqueous phase; separating the organic phase from the aqueous phase; acidifying the organic phase and removing the olefin from the organic phase; isolating the purified dialkylphosphinic acid product; and sulfurizing the purified dialkylphosphinic acid product to form a dialkyldithiophosphinic acid.Type: ApplicationFiled: June 8, 2009Publication date: October 8, 2009Inventors: Leo Zhaoqing Liu, Gary Woodward
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Patent number: 7585927Abstract: A reactive polymeric surfactant that contains: (a) at least two hydrophilic monomeric units per molecule, each independently according to formula (I): wherein R1 is alkylene or oxyalkylene, R2 is H, methyl, or ethyl, R3 is H, and n is greater than about 5, (b) one or more hydrophobic monomeric units per molecule, each independently according to formula (II) wherein R4 is H or methyl, R5 is a hydrophobic group, is useful in stabilizing aqueous emulsions and aqueous dispersions.Type: GrantFiled: March 28, 2007Date of Patent: September 8, 2009Assignee: Rhodia Inc.Inventor: Leo Zhaoqing Liu
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Patent number: 7572931Abstract: An improved process for production of dialkyldithiophosphinic acid including sulfurizing a purified dialkylphosphinic acid by: reacting a hypophosphorous acid or salt with a stoichiometric excess of an alpha olefin in the presence of a free radical initiator to form a reaction product comprising monoalkylphosphinic acid and dialkylphosphinic acid; adding sufficient aqueous base to the reaction product to i) form the salts of the phosphinic acids, and ii) establish an aqueous phase and an organic phase, wherein a monoalkylphosphinic acid solubilizes into an aqueous phase; separating the organic phase from the aqueous phase; acidifying the organic phase and removing the olefin from the organic phase; isolating the purified dialkylphosphinic acid product; and sulfurizing the purified dialkylphosphinic acid product to form a dialkydithiophosphinic acid.Type: GrantFiled: October 25, 2007Date of Patent: August 11, 2009Assignee: Rhodia Inc.Inventors: Leo Zhaoqing Liu, Gary Woodward
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Publication number: 20090163650Abstract: A reactive polymeric surfactant that contains: (a) at least two hydrophilic monomeric units per molecule, each independently according to formula (I): wherein R1 is alkylene or oxyalkylene, R2 is H, methyl, or ethyl, R3 is H, and n is greater than about 5, (b) one or more hydrophobic monomeric units per molecule, each independently according to formula (II) wherein R4 is H or methyl, R5 is a hydrophobic group, is useful in stabilizing aqueous emulsions and aqueous dispersions.Type: ApplicationFiled: February 19, 2009Publication date: June 25, 2009Applicant: RHODIA INC.Inventor: Leo Zhaoqing Liu
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Process for making an acrylic monomer having one or more quaternary ammonium groups and its polymers
Publication number: 20080234432Abstract: A method for making a monomer having an ethylenically unsaturated group and two or more quaternary ammonium groups per molecule, comprising: (a) reacting an excess of a monomeric reactant having at least one ethylenically unsaturated group and at least one tertiary amino group per molecule with a halohydroxyalkyl(trialkyl)quaternary ammonium salt, in an aqueous medium, (b) monitoring the pH of the aqueous medium from at least as early as the time when all reactants have been added to aqueous medium until completion of the reaction, and (c) adjusting the pH of the aqueous medium to and maintaining the pH of the aqueous medium at a value greater than or equal to 9, from the time, after all reactants have been added to aqueous medium, that the reaction mixture exhibits an apparent pH minimum until completion of the reaction.Type: ApplicationFiled: March 19, 2008Publication date: September 25, 2008Inventors: Leo Zhaoqing Liu, Jon D. Kiplinger, Douglas Radtke -
Publication number: 20080234515Abstract: A method for making a (meth)acrylamide monomer, comprises reacting a (meth)acrylate ester with an amino-functional compound in an organic solvent in the presence of a transesterification catalyst.Type: ApplicationFiled: March 19, 2008Publication date: September 25, 2008Inventor: Leo Zhaoqing Liu
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Publication number: 20080103330Abstract: An improved process for production of dialkyldithiophosphinic acid including sulfurizing a purified dialkylphosphinic acid by: reacting a hypophosphorous acid or salt with a stoichiometric excess of an alpha olefin in the presence of a free radical initiator to form a reaction product comprising monoalkylphosphinic acid and dialkylphosphinic acid; adding sufficient aqueous base to the reaction product to i) form the salts of the phosphinic acids, and ii) establish an aqueous phase and an organic phase, wherein a monoalkylphosphinic acid solubilizes into an aqueous phase; separating the organic phase from the aqueous phase; acidifying the organic phase and removing the olefin from the organic phase; isolating the purified dialkylphosphinic acid product; and sulfurizing the purified dialkylphosphinic acid product to form a dialkydithiophosphinic acid.Type: ApplicationFiled: October 25, 2007Publication date: May 1, 2008Inventors: Leo Zhaoqing Liu, Gary Woodward
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Patent number: 7259192Abstract: A method of depolymerizing galactomannan-type polysaccharide polymers and xanthan, preferably galactomannans, to a pre-selected lower molecular weight by irradiation with high energy electron beams. The preferred galactomannans for treatment according to this method are guar gum, guar splits and hydroxypropyl guar. In a preferred embodiment the guar gum is depolymerized preferably to a molecular weight of about 150,000 Daltons to about 200,000 Daltons. The depolymerized guar has a polydispersity of less than about 3.0 and is useful in oil well fracturing to enhance oil production.Type: GrantFiled: June 24, 2003Date of Patent: August 21, 2007Assignee: Rhodia, Inc.Inventors: Leo Zhaoqing Liu, Christian Priou
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Patent number: 7247693Abstract: A polymer includes repetitive units derived from a monomer compound according to formula (I): wherein R1 is a hydrogen atom, a methyl group or an ethyl group, A, which is identical or different, is a group comprising an ester group of formula -A1-C(O)—O-A2-, or an amide group of formula -A1-C(O)—NR10-A2-, wherein: R10, which is identical or different, is hydrogen or an alkyl, hydroxyalkyl, or aminoalkyl C1-C6 linear or branched group, A1, which is identical or different is a covalent bond or a group of formula —(CH2)p1— wherein p1 is an integer of from 1 to 6, A2, which is identical or different, is a linear or branched hydrocarbon group comprising optionally N, O, or S heteroatoms or heterogroups, optionally substituted, optionally forming or comprising a cycle, R1, R2, R3, R5 and R6, which are identical or different, are hydrogen, alkyl, hydroxyalkyl, or aminoalkyl C1-C6 linear or branched groups, or, if inside the brackets, form a heterocycle with group A2, m is an integer of from 1 to 10, n is an inteType: GrantFiled: January 6, 2006Date of Patent: July 24, 2007Assignee: Rhodia Inc.Inventors: Leo Zhaoqing Liu, Dominic Wai-Kwing Yeung
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Patent number: 7030275Abstract: Monomer compounds comprising several cationic groups, a process for making such compounds and polymers derived from such compounds are provided.Type: GrantFiled: June 3, 2003Date of Patent: April 18, 2006Assignee: Rhodia Inc.Inventor: Leo Zhaoqing Liu
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Patent number: 6838514Abstract: A polymer produced by polymerizing via water-in-oil emulsion polymerization one or more water soluble monomers with one or more polyalkoxylated monomers wherein said one or more polyalkoxylated monomers contains at least 25 alkylene oxide units and wherein said product demonstrates thermothickening properties, its method of manufacture and use thereof is disclosed.Type: GrantFiled: April 9, 2003Date of Patent: January 4, 2005Assignee: Rhodia Inc.Inventors: Dominic Wai Kwing Yeung, Leo Zhaoqing Liu, Bruno RC Langlois, Dominique Charmot, Pascale Corpart
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Publication number: 20040072947Abstract: A method of grafting galactomannan-type polysaccharide polymers, preferably guar, to a functional group by irradiation with high energy electron beams in the presence of an unsaturated monomer-compressing the described functional group. The method may include the depolymerization of the grafted polymer to a pre-selected low molecular weight. The preferred galactomannans for treatment according to this method are guar gum, guar splits and hydroxypropyl guar. In a preferred embodiment the guar gum is also depolymerized, preferably to a molecular weight of below about 700,000 Daltons, and most preferably to a molecular weight of between about 100,000 Daltons to about 250,000 Daltons. The depolymerized guar most preferably has a polydispersity of less than about 3.0 and is useful in oil well fracturing to enhance oil production.Type: ApplicationFiled: June 25, 2003Publication date: April 15, 2004Inventors: Leo Zhaoqing Liu, Christian Priou