Patents by Inventor Cheng-Le Zhao

Cheng-Le Zhao 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: 6645563
    Abstract: Aqueous formulations comprising as film-forming constituent at least one copolymer P, synthesized from ethylenically unsaturated monomers M, are used for coating shaped mineral articles, the copolymer P having a glass transition temperature in the range from −25 to +80° C. and the monomers M comprising more than 0.2% by weight and up to 5% by weight, based on their overall weight, of itaconic acid as monomer M1.
    Type: Grant
    Filed: December 7, 2000
    Date of Patent: November 11, 2003
    Assignee: BASF Aktiengesellschaft
    Inventors: Cheng-Le Zhao, Manfred Schwartz, Bertold Bechert, Harm Wiese, Wolfgang Hümmer
  • Patent number: 6638998
    Abstract: The present invention is an aqueous coating composition and method of preparing same that uses certain polyoxyalkylene phosphate surfactants to increase the compatibility of inorganic pigments such as TiO2 with latex polymer binders to reduce the clustering of the inorganic pigment particles in the aqueous coating composition. The aqueous coating composition of the invention includes at least one polyoxyalkylene phosphate surfactant having the following structure: wherein m is 1 or 2, n is an integer from 1 to 100, R1 is C1-C5 alkyl, O—R2 is an alkylphenol residue wherein R2 has the structure C6H4—CpH2p+1 or O—R2 is a linear or branched alkyl alcohol residue wherein R2 has the structure CpH2p+1, and p is an integer from 1 to 30. The aqueous composition further includes at least one latex polymer, at least one inorganic pigment and water.
    Type: Grant
    Filed: April 18, 2001
    Date of Patent: October 28, 2003
    Assignee: BASF AG
    Inventors: Cheng-Le Zhao, Uwe Dittrich
  • Patent number: 6605662
    Abstract: A process for preparing aqueous polymer dispersions comprises first of all subjecting ethylenically unsaturated monomers to free-radical aqueous emulsion polymerization to prepare an aqueous dispersion of a polymer 1 having a glass transition temperature Tg1, then dissolving further, comparatively hard monomers in the dispersed particles of the polymer 1, and subsequently carrying out free-radical polymerization of said monomers dissolved in said particles.
    Type: Grant
    Filed: May 15, 2001
    Date of Patent: August 12, 2003
    Assignee: BASF Aktiengesellschaft
    Inventors: Cheng-Le Zhao, Joachim Roser, Eckehardt Wistuba, Bernhard Schuler, Klemens Mathauer
  • Publication number: 20030022970
    Abstract: The present invention is an aqueous coating composition and method of preparing same that uses certain polyoxyalkylene phosphate surfactants to increase the compatibility of inorganic pigments such as TiO2 with latex polymer binders to reduce the clustering of the inorganic pigment particles in the aqueous coating composition.
    Type: Application
    Filed: April 18, 2001
    Publication date: January 30, 2003
    Applicant: BASF Corporation
    Inventors: Cheng-Le Zhao, Uwe Dittrich
  • Patent number: 6492451
    Abstract: A pigment-comprising formulation for coating substrates, comprising: (i) an aqueous dispersion of at least one water-insoluble polymer P which has phosphonate groups, as a binder, said polymer P having a glass transition temperature Tg in the range of −60° to 80° C., (ii) at least one inorganic pigment, (iii) optionally, one or more inorganic fillers, and (iv) at least one auxiliary, wherein water-insoluble polymer P is obtained by free-radical aqueous emulsion polymerization of ethylenically unsaturated monomers comprising: 90 to 99.9% by weight of at least one monomer a, which is selected from the group consisting of vinylaromatic monomers, the esters of acrylic acid with C1-C12-alkanols, the vinyl esters of aliphatic C1-C12-monocarboxylic acids, ethylene and vinylchloride, and 0.1 to 10% by weight of at least one phosphonate group containing monomer.
    Type: Grant
    Filed: May 11, 2000
    Date of Patent: December 10, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Rolf Dersch, Joachim Roser, Bernhard Schlarb, Cheng-Le Zhao
  • Patent number: 6476097
    Abstract: An essentially solventless pigmented aqueous formulation which comprises: i) at least one polymer A in the form of polymer particles in disperse distribution, said particles comprising, from 80 to 99.9% by weight, based on the overall weight of the polymer A, of a water-insoluble polymer 1 having a glass transition temperature Tg1 in the range from −50 to +40° C., built up from ethylenically unsaturated monomers M1, and from 0.1 to 20% by weight, based on the overall weight of the polymer A, of one or more water-insoluble polymers i having a glass transition temperature Tgi of more than 50° C., built up from ethylenically unsaturated monomers Mi, ii) at least one pigment and, if desired, one or more extenders.
    Type: Grant
    Filed: January 8, 2001
    Date of Patent: November 5, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Cheng-Le Zhao, Uwe Dittrich, Manfred Schwartz, Wolfgang Hümmer
  • Patent number: 6451899
    Abstract: The present invention relates to aqueous formulations comprising: i. at least one hydrophilic particulate polymer P1, as an aqueous dispersion, composed essentially of monoethylenically unsaturated monomers having a water-solubility in the range from 10 to 100 g/l (at 25° C. and 1 bar), and ii. at least one hydrophobic particulate polymer P2, as an aqueous dispersion, composed essentially of ethylenically unsaturated monomers having a water-solubility below 10 g/l (at 25° C. and 1 bar), the glass transition temperature Tg1 of the polymer P1 being less than 10 K different from the glass transition temperature Tg2 of the polymer P2.
    Type: Grant
    Filed: November 20, 2000
    Date of Patent: September 17, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Cheng-Le Zhao, Uwe Dittrich, Joachim Roser, Joachim Pakusch, Harald Röckel
  • Publication number: 20020082319
    Abstract: A process for preparing aqueous polymer dispersions comprises first of all subjecting ethylenically unsaturated monomers to free-radical aqueous emulsion polymerization to prepare an aqueous dispersion of a polymer 1 having a glass transition temperature Tg1, then dissolving further, comparatively hard monomers in the dispersed particles of the polymer 1, and subsequently carrying out free-radical polymerization of said monomers dissolved in said particles.
    Type: Application
    Filed: May 15, 2001
    Publication date: June 27, 2002
    Applicant: BASF AKTIENGESELLSCHAFT
    Inventors: Cheng-Le Zhao, Joachim Roser, Eckehardt Wistuba, Bernhard Schuler, Klemens Mathauer
  • Patent number: 6376570
    Abstract: The present invention provides aqueous pigmented coating compositions having a pigment volume concentration pvc of at least 10 which are essentially free from volatile organic compounds and comprise: (i) at least one aqueous room temperature film forming polymer dispersion of at least one polymer P which is composed of esters of acrylic acid with C2-C20 alkanols or C5-C10 cycloalkanols and/or esters of methacrylic acid with C1-C20 alkanols or C5-C10 cycloalkanols, (ii) at least one inorganic pigment and, if desired, organic or inorganic fillers, (iii) from 0.05 to <0.3% by weight, based on the polymer P, of at least one nonpolymerizable photoinitiator, (iv) water, and customary auxiliaries.
    Type: Grant
    Filed: April 19, 2000
    Date of Patent: April 23, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Cheng-Le Zhao, Uwe Dittrich, Manfred Schwartz, Gernot Franzmann
  • Patent number: 6348528
    Abstract: Aqueous polymer dispersion comprising from 0.1 to 10 parts by weight per 100 parts by weight of polymer of an emulsifier A) having a phosphate group, wherein said emulsifier consists at least 50% by weight of ethylene oxide and propylene oxide groups and the proportion of the ethylene oxide groups and propylene oxide groups is in each case at least 10% by weight, based on the overall amount of the ethylene oxide and propylene oxide groups.
    Type: Grant
    Filed: September 12, 2000
    Date of Patent: February 19, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Bernhard Schlarb, Gregor Ley, Cheng-Le Zhao, Alexander Haunschild, Maria Gyopar Rau, Rolf Dersch
  • Patent number: 6265028
    Abstract: Aqueous formulations comprising: i) at least one film-forming polymer A constructed from ethylenically unsaturated monomers M and present in dispersed form in the aqueous formulation, said monomers M comprising at least one monethylenically unsaturated monomer M1 of the formula I  where X, R1, R2 and R3 are as defined in claim 1 and ii) at least one compound B having two or more aldehyde groups are used for coating substrates consisting essentially of polyurethanes.
    Type: Grant
    Filed: July 7, 1999
    Date of Patent: July 24, 2001
    Assignee: BASF Aktiengesellschaft
    Inventors: Cheng-Le Zhao, Eckehardt Wistuba, Roland Baumstark, Gerald Wildburg
  • Patent number: 6262144
    Abstract: A process for preparing aqueous polymer dispersions comprises first of all subjecting ethylenically unsaturated monomers to free-radical aqueous emulsion polymerization to prepare an aqueous dispersion of a polymer 1 having a glass transition temperature Tg1, then dissolving further, comparatively hard monomers in the dispersed particles of the polymer 1, and subsequently carrying out free-radical polymerization of the monomers dissolved in the particles.
    Type: Grant
    Filed: December 1, 2000
    Date of Patent: July 17, 2001
    Assignee: BASF Aktiengesellschaft
    Inventors: Cheng-Le Zhao, Joachim Roser, Eckehardt Wistuba, Bernhard Schuler, Klemens Mathauer
  • Patent number: 6242515
    Abstract: The present invention relates to the use of compositions comprising at least one aqueous polymer dispersion wherein the polymer has carbonyl or oxirane groups (component a)) and at least one compound with at least two NH2 groups per molecule as sealing or coating compositions, especially for substrates with a hydrophobic surface. The present invention further relates to coating compositions containing such binder formulations.
    Type: Grant
    Filed: July 26, 1999
    Date of Patent: June 5, 2001
    Assignee: BASF Aktiengesellschaft
    Inventors: Cheng-Le Zhao, Eckehardt Wistuba, Joachim Roser, Paul Fitzgerald, Jan Spitzer
  • Publication number: 20010000232
    Abstract: Aqueous formulations comprising as film-forming constituent at least one copolymer P, synthesized from ethylenically unsaturated monomers M, are used for coating shaped mineral articles, the copolymer P having a glass transition temperature in the range from −25° to +80° C. and the monomers M comprising more than 0.2% by weight and up to 5% by weight, based on their overall weight, of itaconic acid as monomer M1.
    Type: Application
    Filed: December 7, 2000
    Publication date: April 12, 2001
    Inventors: Cheng-Le Zhao, Manfred Schwartz, Bertold Bechert, Harm Wiese, Wolfgang Hummer
  • Patent number: 5763012
    Abstract: The present invention relates to a method of coating substrates, especially those with a hydrophobic surface, in which the substrate to be coated is coated with a coating composition whose binder is a formulation comprising an aqueous polymer dispersion in which the polymer has carbonyl or oxirane groups (component a)), and at least one compound having at least two NH.sub.2 groups per molecule, is applied to the substrate to be coated ?sic!. It also relates to coating compositions including such binder formulations, and furthermore to a method of sealing using a sealing composition including such formulations as its binder.
    Type: Grant
    Filed: October 16, 1996
    Date of Patent: June 9, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Cheng-Le Zhao, Eckehardt Wistuba, Joachim Roser, Paul Fitzgerald, Jan Spitzer