Patents by Inventor Robert D. Petrasko

Robert D. Petrasko 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).

  • Water whitening-resistant pressure-sensitive adhesives
    Patent number: 6489387
    Abstract: Acrylic emulsion PSA polymers which when cast as a film resist water whitening by hot or ambient temperature water are provided, and are formed by copolymerizing a monomer mixture comprising at least one alkyl acrylate ester of an alcohol containing at least four carbon atoms, at least one polar comonomer and at least one partially water soluble comonomer present in an amount of at least about 7% by weight of the monomers. Polymerization is carried out in the presence of at least one nonionic surfactant containing at least about 8 moles of ethylene oxide per mole nonionic surfactant and at least one anionic surfactant containing up to about 10 moles ethylene oxide per mole anionic surfactant. There is added to the product of polymerization at least one base to produce an emulsion having a pH greater than 7 and containing particles having a mean “volume-average” particle diameter of up to about 210 nm as determined by laser light scattering.
    Type: Grant
    Filed: March 28, 1997
    Date of Patent: December 3, 2002
    Assignee: Avery Dennison Corporation
    Inventors: Prakash Mallya, Xing-Ya Li, Colin C. Smith, George Dilts, Kregg D. Albrecht, Joseph T. Tenhagen, Robert D. Petrasko
  • HOT WATER WHITENING RESISTANT EMULSION PRESSURE SENSITIVE ADHESIVES
    Publication number: 20010003765
    Abstract: Acrylic emulsion PSA polymers which when cast as a film resist water whitening by hot or ambient temperature water are provided, and are formed by copolymerizing a monomer mixture comprising at least one alkyl acrylate ester of an alcohol containing at least four carbon atoms, at least one polar comonomer and at least one partially water soluble comonomer present in an amount of at least about 7% by weight of the monomers. Polymerization is carried out in the presence of at least one nonionic surfactant containing at least about 8 moles of ethylene oxide per mole nonionic surfactant and at least one anionic surfactant containing up to about 10 moles ethylene oxide per mole anionic surfactant. There is added to the product of polymerization at least one base to produce an emulsion having a pH greater than 7 and containing particles having a mean “volume-average” particle diameter of up to about 210 nm as determined by laser light scattering.
    Type: Application
    Filed: March 28, 1997
    Publication date: June 14, 2001
    Applicant: Prakash Mallya
    Inventors: PRAKASH MALLYA, XING-YA LI, COLIN C. SMITH, GEORGE DILTS, KREGG D. ALBRECHT, JOSEPH T. TENHAGEN, ROBERT D. PETRASKO