Patents by Inventor Christian Leonard

Christian Leonard 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).

  • Publication number: 20030119982
    Abstract: The reaction of unsaturated carbonates such as vinyl ethylene carbonate with N-aminoethylimidazolidone (TAM) under mild conditions generates a mixture of two vinyl and hydroxy functional imidazolidone carbamates which polymerize readily into acrylate or vinyl acetate based emulsion polymers. The polymers show enhanced wet adhesion (wet scrubbability) in latex paints and coatings.
    Type: Application
    Filed: December 12, 2002
    Publication date: June 26, 2003
    Inventors: Robert Krantz Pinschmidt, Khalil Yacoub, Christian Leonard Daniels, Kien Van Phung
  • Patent number: 6538143
    Abstract: The reaction of unsaturated carbonates such as vinyl ethylene carbonate with N-aminoethylimidazolidone (TAM) under mild conditions generates a mixture of two vinyl and hydroxy functional imidazolidone carbamates which polymerize readily into acrylate or vinyl acetate based emulsion polymers. The polymers show enhanced wet adhesion (wet scrubbability) in latex paints and coatings.
    Type: Grant
    Filed: June 26, 2000
    Date of Patent: March 25, 2003
    Assignee: Air Products Polymers, L.P.
    Inventors: Robert Krantz Pinschmidt, Jr., Khalil Yacoub, Christian Leonard Daniels, Kien Van Phung
  • Patent number: 6319978
    Abstract: The present invention is directed to improved vinyl acetate ethylene pressure sensitive adhesive emulsion polymers. The improvement in the aqueous based, emulsion polymerized pressure sensitive adhesives resides in: a high ethylene content copolymer having a Tg of from −25 to −70° C.; a tensile storage modulus measured at one hertz and at a temperature of −20° C. embraced by the points on a plot of storage modulus and temperature of from 1 times 106 and the points 4 times 109 dynes/cm2 and less that 1 times 107 dynes/cm2 measured at 50° C.
    Type: Grant
    Filed: October 1, 1998
    Date of Patent: November 20, 2001
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Christian Leonard Daniels, Chung-Ling Mao, Richard Henry Bott, Menas Spyros Vratsanos
  • Patent number: 6063858
    Abstract: Improved aqueous emulsion vinyl acetate-ethylene (VAE) polymer adhesives for use in packaging applications and on difficult to bond surfaces such as polyethylene, poly(ethylene terephthalate), and oriented polypropylene. The VAE polymers contain about 55-80 wt % vinyl acetate, 15-45 wt % ethylene, and 0-30 wt % of one or more additional ethylenically unsaturated copolymerizable monomer, based on the total weight of monomers. Cast films of the VAE emulsion polymers of this invention should have a tensile storage modulus (test frequency of 6.28 rad/sec) within the area encompassed by the following data points: 1.times.10.sup.5 and 2.times.10.sup.7 dynes/cm.sup.2 at 23.degree. C., and 1.times.10.sup.3 and 2.times.10.sup.6 dynes/cm.sup.2 at 70.degree. C.; preferably within the area encompassed by the following data points: 1.times.10.sup.6 and 1.5.times.10.sup.7 dynes/cm.sup.2 at 23.degree. C., and 3.times.10.sup.4 and 9.times.10.sup.5 dynes/cm.sup.2 at 70.degree. C.
    Type: Grant
    Filed: November 19, 1998
    Date of Patent: May 16, 2000
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Christian Leonard Daniels, Randolf J. Lorenz, Richard Joseph Goddard
  • Patent number: 5874498
    Abstract: This invention relates to improved vinyl acetate-ethylene emulsions for use in formulating high performance paints without the need for coalescing solvents. These latexes are based on copolymers of vinyl acetate and ethylene optionally containing a comonomer such as an alkyl acrylate or methacrylate. Paints formulated from these latexes, without coalescing solvents, are characterized as having substantially no insolubles, the resin particles in the emulsion are characterized as having a particle size of from 0.2 to 0.35 microns measured as weight average by capillary hydrodynamic fractionation. In other words, the copolymer particles are characterized in that a small percentage, up to about 5% of the total number of particles in the latex, have an average size greater than 0.35 microns, and a small percentage have a size smaller than about 0.2 microns. Further the resin particles are essentially monodisperse.
    Type: Grant
    Filed: March 11, 1996
    Date of Patent: February 23, 1999
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Christian Leonard Daniels, Leon Edward Newman
  • Patent number: 5872181
    Abstract: Improved aqueous emulsion vinyl acetate-ethylene (VAE) polymer adhesives for use in packaging applications and on difficult to bond surfaces such as polyethylene, poly(ethylene terephthalate), and oriented polypropylene. The VAE polymers contain about 55-80 wt % vinyl acetate, 15-45 wt % ethylene, and 0-30 wt % of one or more additional ethylenically unsaturated copolymerizable monomer, based on the total weight of monomers. Cast films of the VAE emulsion polymers of this invention should have a tensile storage modulus (test frequency of 6.28 rad/sec) within the area encompassed by the following data points: 1.times.10.sup.5 and 2.times.10.sup.7 dynes/cm.sup.2 at 23.degree. C., and 1.times.10.sup.3 and 2.times.10.sup.6 dynes/cm.sup.2 at 70.degree. C.; preferably within the area encompassed by the following data points: 1.times.10.sup.6 and 1.5.times.10.sup.7 dynes/cm.sup.2 at 23.degree. C., and 3.times.10.sup.4 and 9.times.10.sup.5 dynes/cm.sup.2 at 70.degree. C.
    Type: Grant
    Filed: July 9, 1997
    Date of Patent: February 16, 1999
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Christian Leonard Daniels, Randolph J. Lorenz, Richard Joseph Goddard