Patents by Inventor Conrad William Perry

Conrad William Perry 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: 9340908
    Abstract: An aqueous composition includes polyvinyl alcohol, an acid having a pKa of at most 4.0, and a dispersion of a polymer in which vinyl acetate units constitute at least 60 wt % of the polymer. The polymer does not contain units of any N-methylol-containing monomer, and at least a portion of the polyvinyl alcohol is present in the form of an emulsion stabilizer for the polymer. The wet strength of a fibrous nonwoven substrate can be increased by applying one or more aqueous compositions that together include polyvinyl alcohol, an acid having a pKa of at most 4.0, and a dispersion of a polymer as described above, followed by a final drying step. A fibrous nonwoven article can be prepared in this way.
    Type: Grant
    Filed: December 7, 2011
    Date of Patent: May 17, 2016
    Assignee: WACKER CHEMICAL CORPORATION
    Inventors: John Richard Boylan, Conrad William Perry
  • Publication number: 20130149928
    Abstract: An aqueous composition includes a blend of: a) an aqueous dispersion of a vinyl acetate ethylene or vinyl acetate polymer, stabilized by polyvinyl alcohol and optionally also by a surfactant, wherein the polymer does not include units of any N-methylol-containing monomer; and b) an aqueous dispersion of an N-methylol-containing vinyl acetate ethylene or vinyl acetate polymer, stabilized with a surfactant, polyvinyl alcohol or a combination thereof. A method of increasing the wet strength of a fibrous nonwoven substrate includes applying to the substrate the abovementioned aqueous composition, followed by a drying step. A fibrous nonwoven article is produced.
    Type: Application
    Filed: December 7, 2011
    Publication date: June 13, 2013
    Applicant: Wacker Chemical Corporation
    Inventors: John Richard Boylan, Conrad William Perry
  • Publication number: 20130149927
    Abstract: An aqueous composition includes polyvinyl alcohol, an acid having a pKa of at most 4.0, and a dispersion of a polymer in which vinyl acetate units constitute at least 60 wt % of the polymer. The polymer does not contain units of any N-methylol-containing monomer, and at least a portion of the polyvinyl alcohol is present in the form of an emulsion stabilizer for the polymer. The wet strength of a fibrous nonwoven substrate can be increased by applying one or more aqueous compositions that together include polyvinyl alcohol, an acid having a pKa of at most 4.0, and a dispersion of a polymer as described above, followed by a final drying step. A fibrous nonwoven article can be prepared in this way.
    Type: Application
    Filed: December 7, 2011
    Publication date: June 13, 2013
    Applicant: Wacker Chemical Corporation
    Inventors: John Richard Boylan, Conrad William Perry
  • Publication number: 20120028527
    Abstract: A low-formaldehyde binder composition for increasing wet and dry tensile strength of a nonwoven substrate includes: a) an aqueous vinyl acetate ethylene copolymer dispersion employing a nonionic, cationic or amphoteric dispersion stabilizer, b) chitosan, and c) one or more surfactants not including the dispersion stabilizer. The binder composition has a free formaldehyde content no greater than 10 ppm, at least 90 wt % of the one or more surfactants are nonionic, cationic, amphoteric or a combination of these, and the copolymer in the dispersion is free of formaldehyde-generating moieties.
    Type: Application
    Filed: July 30, 2010
    Publication date: February 2, 2012
    Applicant: Wacker Chemical Corporation
    Inventors: John Richard Boylan, Conrad William Perry
  • Patent number: 7247586
    Abstract: This invention is directed to an improvement in binders particularly suited for use in preparing nonwoven products and to the nonwoven products. The improved binders comprise a blend of a vinyl chloride (VCl) polymer emulsion and a self crosslinkable vinyl acetate-ethylene-N-methylolacrylamide (VAE-NMA) polymer emulsion. The blend of the VCl polymer emulsion and the VAE-NMA polymer emulsion can be applied to cellulose and cellulose/synthetic nonwoven substrates and cured in the absence of an acid catalyst to provide a self-sustaining web having excellent wet strength performance.
    Type: Grant
    Filed: July 1, 2005
    Date of Patent: July 24, 2007
    Assignee: Air Products Polymers, L.P.
    Inventors: John Richard Boylan, Conrad William Perry
  • Patent number: 7153791
    Abstract: This invention is directed to an improvement in binders particularly suited for use in preparing nonwoven products and to the nonwoven products. The improved binders comprise a blend of emulsion polymerized ethylene-vinyl chloride (EVCl) polymer and an emulsion polymerized self crosslinkable vinyl acetate-ethylene-N-methylolacrylamide (VAE-NMA) polymer. The blends of the EVCl polymer emulsion and the VAE-NMA polymer emulsion can be applied to cellulose and cellulose/synthetic nonwoven substrates and cured in the absence of an acid catalyst to provide a self-sustaining web having excellent wet strength performance. The blends of EVCl and VAE-NMA polymers do not require an acid catalyst to facilitate cure.
    Type: Grant
    Filed: September 7, 2004
    Date of Patent: December 26, 2006
    Assignee: Air Products Polymers, L.P.
    Inventors: John Richard Boylan, Conrad William Perry