Patents by Inventor Sergey Ivanchev

Sergey Ivanchev 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).

  • Method for the preparation of hollow polymer particle latex
    Patent number: 6235810
    Abstract: A method for the preparation of latexes with hollow polymer particles useful as opacifying agents. The process comprises the preparation of hollow polymer particle latex by emulsion copolymerization with water soluble initiator and anionic surfactant as follows: a) preparation of seed latex of copolymer containing methyl methacrylate and methacrylic acid; b) preparation of latex of highly carboxylated copolymer containing methyl methacrylate and a cross-linking agent and optionally a vinyl aromatic compound; c) using highly carboxylated latex synthesized at stage b) in the preparation of the intermediate shell comprising a copolymer of methyl methacrylate, acrylic acid ester, a cross-linking agent and optionally vinyl aromatic compound, said intermediate shell copolymer having a glass transition temperature below 80° C.
    Type: Grant
    Filed: November 22, 1999
    Date of Patent: May 22, 2001
    Assignee: Neste Chemicals OY
    Inventors: Valery Pavlyuchenko, Nina Byrdina, Sergey Ivanchev, Mikael Skrifvars, Erkki Halme, Hanna Laamanen, Jukka Koskinen