Patents by Inventor David J. Castro
David J. Castro 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: 12203220Abstract: Paper treating compositions and methods of using the same are disclosed herein. The paper treating compositions of the present disclosure may include a strength agent and a surfactant or a sizing agent and a surfactant. The compositions and methods can be used to improve sizing and paper strength, especially, for example in spray size press applications.Type: GrantFiled: March 31, 2020Date of Patent: January 21, 2025Assignee: Ecolab USA Inc.Inventors: David J. Castro, Victor Fuk-Pong Man, Stephen Raye Marrou, Gang Pu
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Patent number: 11982055Abstract: Creping adhesives and processes for making and using same. In some embodiments, the creping adhesive can include a solvent, a modified polyvinyl alcohol, and a crosslinked resin. The crosslinked resin can include polyamidoamine backbones crosslinked by primary crosslinking moieties and propanediyl moieties, where the primary crosslinking moieties can be derived from a functionally symmetric crosslinker. In other embodiments, the crosslinked resin can include polyamidoamine backbones crosslinked by primary crosslinking moieties and secondary crosslinking moieties, where the primary crosslinking moieties can be derived from a first functionally symmetric crosslinker and the secondary crosslinking moieties can be derived from a second functionally symmetric crosslinker. In other embodiments, the crosslinked resin can include polyamidoamine backbones crosslinked by primary crosslinking moieties, where the primary crosslinking moieties can be derived from a functionally symmetric crosslinker.Type: GrantFiled: November 6, 2020Date of Patent: May 14, 2024Assignee: ECOLABS USA INC.Inventors: Ashish Dhawan, David J. Castro, Gary S. Furman, Christopher Kaley
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Publication number: 20240150967Abstract: Creping adhesives and processes for making and using same. In some embodiments, the creping adhesive can include a solvent, a modified polyvinyl alcohol, and a crosslinked resin.Type: ApplicationFiled: January 8, 2024Publication date: May 9, 2024Applicant: ECOLAB USA INC.Inventors: Ashish Dhawan, David J. Castro, Gary S. Furman, Christopher Kaley
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Patent number: 11427738Abstract: Methods and compositions useful in papermaking and tissuemaking applications are provided. Some embodiments of the methods and compositions include a polyaminoamide polymer functionalized with an acrylamidophenyl boronic acid and a crosslinked polyaminoamide functionalized with an acrylamidophenyl boronic acid. The methods and compositions provide useful properties for creping that include good adhesion even under excessively wet conditions, improved film uniformity, and good film durability, while maintaining good film softness and rewettability necessary for efficient runnability of the tissue machine.Type: GrantFiled: June 26, 2020Date of Patent: August 30, 2022Assignee: ECOLAB USA INC.Inventors: Gary Samuel Furman, Jr., David J. Castro, Christopher Kaley, Kevin McDonald, Mingli Wei
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Publication number: 20220205185Abstract: Paper treating compositions and methods of using the same are disclosed herein. The paper treating compositions of the present disclosure may include a strength agent and a surfactant or a sizing agent and a surfactant. The compositions and methods can be used to improve sizing and paper strength, especially, for example in spray size press applications.Type: ApplicationFiled: March 31, 2020Publication date: June 30, 2022Applicant: ECOLAB USA INC.Inventors: David J. Castro, Victor Fuk-Pong Man, Stephen Raye Marrou, Gang Pu
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Publication number: 20210140110Abstract: Creping adhesives and processes for making and using same. In some embodiments, the creping adhesive can include a solvent, a modified polyvinyl alcohol, and a crosslinked resin. The crosslinked resin can include polyamidoamine backbones crosslinked by primary crosslinking moieties and propanediyl moieties, where the primary crosslinking moieties can be derived from a functionally symmetric crosslinker. In other embodiments, the crosslinked resin can include polyamidoamine backbones crosslinked by primary crosslinking moieties and secondary crosslinking moieties, where the primary crosslinking moieties can be derived from a first functionally symmetric crosslinker and the secondary crosslinking moieties can be derived from a second functionally symmetric crosslinker. In other embodiments, the crosslinked resin can include polyamidoamine backbones crosslinked by primary crosslinking moieties, where the primary crosslinking moieties can be derived from a functionally symmetric crosslinker.Type: ApplicationFiled: November 6, 2020Publication date: May 13, 2021Applicant: ECOLAB USA INC.Inventors: Ashish Dhawan, David J. Castro, Gary S. Furman, Christopher Kaley
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Publication number: 20210079143Abstract: Strengthening resins and processes for making and using same. In some embodiments, a resin mixture can include a solvent and a strengthening resin. The strengthening resin can include one or more hydrophobic monomers incorporated therein. The strengthening resin can have a chemical formula of (I). The chemical formula (I) can include: where each R2 can be derived from a hydrophobic monomer.Type: ApplicationFiled: August 3, 2020Publication date: March 18, 2021Applicant: ECOLAB USA INC.Inventors: Gary S. Furman, En-Wei Lin, Mei Liu, David J. Castro, Christopher D. Kaley
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Publication number: 20200325370Abstract: Methods and compositions useful in papermaking and tissuemaking applications are provided. Some embodiments of the methods and compositions include a polyaminoamide polymer functionalized with an acrylamidophenyl boronic acid and a crosslinked polyaminoamide functionalized with an acrylamidophenyl boronic acid. The methods and compositions provide useful properties for creping that include good adhesion even under excessively wet conditions, improved film uniformity, and good film durability, while maintaining good film softness and rewettability necessary for efficient runnability of the tissue machine.Type: ApplicationFiled: June 26, 2020Publication date: October 15, 2020Applicant: ECOLAB USA INC.Inventors: Gary Samuel Furman, JR., David J. Castro, Christopher Kaley, Kevin McDonald, Mingli Wei
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Patent number: 10731063Abstract: Methods and compositions useful in papermaking and tissuemaking applications are provided. Some embodiments of the methods and compositions comprise a polyaminoamide (“PAA”) polymer functionalized with an acrylamidophenyl boronic acid and a crosslinked polyaminoamide functionalized with an acrylamidophenyl boronic acid. The methods and compositions provide useful properties for creping that include good adhesion even under excessively wet conditions, improved film uniformity, and good film durability, while maintaining good film softness and rewettability necessary for efficient runnability of the tissue machine.Type: GrantFiled: May 18, 2018Date of Patent: August 4, 2020Assignee: ECOLAB USA INC.Inventors: Gary Samuel Furman, Jr., David J. Castro, Christopher Kaley, Kevin McDonald, Mingli Wei
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Patent number: 10227731Abstract: The present disclosure provides for a method of preparing and using an emulsion for treating a papermaking process. The emulsion is an oil-in-water emulsion of alkenyl succinic anhydride emulsified with a polymer comprising at least one primary or secondary amine containing monomer. The method comprises adding an oil-in-water emulsion to the papermaking process; wherein the oil-in-water emulsion comprises alkenyl succinic anhydride emulsified with a polymer comprising at least one primary or secondary amine containing monomer; and wherein the oil-in-water emulsion is added in an amount sufficient to improve sizing of the paper produced by the papermaking process. The primary or secondary amine may be a secondary amine comprising diallylamine, and the polymer may be a diallylamine-acrylamide copolymer.Type: GrantFiled: April 12, 2017Date of Patent: March 12, 2019Assignee: Ecolab USA Inc.Inventors: Michael R. St. John, David J. Castro, Mei Liu
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Publication number: 20180334601Abstract: Methods and compositions useful in papermaking and tissuemaking applications are provided. Some embodiments of the methods and compositions comprise a polyaminoamide (“PAA”) polymer functionalized with an acrylamidophenyl boronic acid and a crosslinked polyaminoamide functionalized with an acrylamidophenyl boronic acid. The methods and compositions provide useful properties for creping that include good adhesion even under excessively wet conditions, improved film uniformity, and good film durability, while maintaining good film softness and rewettability necessary for efficient runnability of the tissue machine.Type: ApplicationFiled: May 18, 2018Publication date: November 22, 2018Applicant: Ecolab USA Inc.Inventors: Gary Samuel Furman, JR., David J. Castro, Christopher Kaley, Kevin McDonald, Mingli Wei
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Patent number: 10132040Abstract: Methods and compositions for improving the characteristics of paper substrates are disclosed. The methods involve adding to a paper substrate an NCC-polymer. NCC-polymers have unique chemical properties which result in improvements in wet strength, dry strength and drainage retention properties of the paper substrates.Type: GrantFiled: July 5, 2016Date of Patent: November 20, 2018Assignee: ECOLAB USA INC.Inventors: David J. Castro, Rangarani Karnati, Shawnee M. Wilson, Weiguo Cheng, Mei Liu, Zhiyi Zhang
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Patent number: 9840810Abstract: The disclosure provides methods and compositions for increasing the strength of a paper sheet. The method involves adding to the paper sheet an amine-containing polymer. The amine-containing polymer interacts with materials such as glyoxalated polyacrylamide or starch to make the paper stronger in terms including tensile strength, surface strength and bulk strength.Type: GrantFiled: May 22, 2017Date of Patent: December 12, 2017Assignee: ECOLAB USA INC.Inventors: David J. Castro, Robert M. Lowe, Mei Liu
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Publication number: 20170254021Abstract: The disclosure provides methods and compositions for increasing the strength of a paper sheet. The method involves adding to the paper sheet an amine-containing polymer. The amine-containing polymer interacts with materials such as glyoxalated polyacrylamide or starch to make the paper stronger in terms including tensile strength, surface strength and bulk strength.Type: ApplicationFiled: May 22, 2017Publication date: September 7, 2017Applicant: ECOLAB USA INC.Inventors: David J. Castro, Robert M. Lowe, Mei Liu
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Publication number: 20170218571Abstract: The present disclosure provides for a method of preparing and using an emulsion for treating a papermaking process. The emulsion is an oil-in-water emulsion of alkenyl succinic anhydride emulsified with a polymer comprising at least one primary or secondary amine containing monomer. The method comprises adding an oil-in-water emulsion to the papermaking process; wherein the oil-in-water emulsion comprises alkenyl succinic anhydride emulsified with a polymer comprising at least one primary or secondary amine containing monomer; and wherein the oil-in-water emulsion is added in an amount sufficient to improve sizing of the paper produced by the papermaking process. The primary or secondary amine may be a secondary amine comprising diallylamine, and the polymer may be a diallylamine-acrylamide copolymer.Type: ApplicationFiled: April 12, 2017Publication date: August 3, 2017Applicant: Ecolab USA Inc.Inventors: Michael R. St. John, David J. Castro, Mei Liu
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Patent number: 9702086Abstract: The invention provides methods and compositions for increasing the strength of a paper sheet. The method involves adding to the paper sheet an amine containing polymer. The amine containing polymer interacts with materials such as GPAM or starch to make the paper stronger in terms including tensile strength, surface strength and bulk strength.Type: GrantFiled: October 6, 2014Date of Patent: July 11, 2017Assignee: ECOLAB USA INC.Inventors: David J. Castro, Robert M. Lowe, Mei Liu
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Patent number: 9624623Abstract: The present disclosure provides for a method of preparing and using an emulsion for treating a papermaking process. The emulsion is an oil-in-water emulsion of alkenyl succinic anhydride emulsified with a polymer comprising at least one primary or secondary amine containing monomer. The method comprises adding an oil-in-water emulsion to the papermaking process; wherein the oil-in-water emulsion comprises alkenyl succinic anhydride emulsified with a polymer comprising at least one primary or secondary amine containing monomer; and wherein the oil-in-water emulsion is added in an amount sufficient to improve sizing of the paper produced by the papermaking process. The primary or secondary amine may be a secondary amine comprising diallylamine, and the polymer may be a diallylamine-acrylamide copolymer.Type: GrantFiled: October 6, 2014Date of Patent: April 18, 2017Assignee: ECOLAB USA INC.Inventors: Michael R. St. John, David J. Castro, Mei Liu
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Patent number: 9611589Abstract: Size press formulations and methods of treating a substrate using the size press formulations. The size press formulations may include solids. The solids may include a polyaluminum chloride compound, starch, an optical brightening agent, and a salt. Suitable polyaluminum chloride compounds include phosphated polyaluminum chloride, sulfated polyaluminum chloride, polyaluminum chloride, polyaluminum silica sulfate chloride, and any combination thereof.Type: GrantFiled: May 10, 2016Date of Patent: April 4, 2017Assignee: ECOLAB USA INC.Inventors: David J. Castro, William Andrews, Daniel E. Schwarz
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Patent number: 9574119Abstract: This invention is method of producing a creping cylinder adhesive comprising: contacting a dry form PVOH with a liquid form PVA at a temperature of less than 80° C., maintaining the PVOH and PVA at a temperature of between 90-95° C. until the PVOH is completely dissolved into a medium, and allowing the medium to cool to below 80° C.Type: GrantFiled: February 8, 2016Date of Patent: February 21, 2017Assignee: Nalco CompanyInventors: Gary S. Furman, Jr., Mingli Wei, Christopher D. Kaley, David J. Castro, Vladimir A. Grigoriev
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Publication number: 20160312410Abstract: Methods and compositions for improving the characteristics of paper substrates are disclosed. The methods involve adding to a paper substrate an NCC-polymer. NCC-polymers have unique chemical properties which result in improvements in wet strength, dry strength and drainage retention properties of the paper substrates.Type: ApplicationFiled: July 5, 2016Publication date: October 27, 2016Applicant: ECOLAB USA INC.Inventors: David J. Castro, Rangarani Karnati, Shawnee M. Wilson, Weiguo Cheng, Mei Liu, Zhiyi Zhang