Patents Examined by Roberto Robago
  • Vinyl alcohol copolymer and method for producing same
    Patent number: 9951161
    Abstract: Provided is a vinyl alcohol-based copolymer, obtained by saponifying a copolymer of vinyl acetate and a polyfunctional monomer, wherein the polyfunctional monomer contains two or more ethylenic double bonds in its molecule, the vinyl alcohol-based copolymer has a side chain containing an ethylenic double bond and a molar ratio (d) of the ethylenic double bond to a total of vinyl alcohol units and vinyl acetate units is from 0.05/100 to 2/100, and the vinyl alcohol-based copolymer is water soluble.
    Type: Grant
    Filed: April 17, 2014
    Date of Patent: April 24, 2018
    Assignee: KURARAY CO., LTD.
    Inventors: Yosuke Kumaki, Tatsuya Tanida
  • Water-absorbent resin and its production process
    Patent number: 8487048
    Abstract: Objects of the present invention are: to provide a water-absorbent resin which exhibits excellent balances between water absorption performances; and further to provide a process by which a water-absorbent resin having excellent absorption properties can be produced even if no hydrophilic organic solvent is used, or even if its amount is extremely reduced, when carrying out the surface-crosslinking treatment; and further to provide a water-absorbent resin optimum to absorbent articles such as diapers.
    Type: Grant
    Filed: May 7, 2004
    Date of Patent: July 16, 2013
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Katsuyuki Wada, Masatoshi Nakamura, Kazuki Kimura, Kunihiko Ishizaki
  • Aromatic organosulfur functionalized 1,4-cis polybutadiene
    Patent number: 8198378
    Abstract: The present invention relates to a preparation method of aromatic organosulfur functionalized 1,4-cis polybutadiene comprising: polymerizing 1,3-butadiene or butadiene derivative in the presence of a specific catalyst in a nonpolar solvent to prepare 1,4-cis polybutadiene; and reacting the resultant polybutadiene with an aromatic organosulfur compound. Such prepared aromatic organosulfur functionalized 1,4-cis polybutadiene is without ultrahigh molecular weight region and, thus, has narrow molecular weight distribution.
    Type: Grant
    Filed: October 20, 2008
    Date of Patent: June 12, 2012
    Assignee: Korea Kumho Petrochemical Co., Ltd.
    Inventors: Gwang Hoon Kwag, Pil Sung Kim, Seung Hwon Lee, Hyung Kyu Choi, Hyun Jin Kim
  • Unhydrogenated block copolymer compositions
    Patent number: 7858693
    Abstract: The present invention relates to novel compositions comprising (a) anionic block copolymers having at least two blocks of a mono alkenyl arene and at least one block of a conjugated diene and mono alkenyl arene having a specific arrangement of the monomers in the copolymer block, and (b) tailored softening modifiers have a particular structure that results in a surprising improvement in properties for the composition. Also included are processes for the manufacturing such novel compositions and various end-uses and applications for such compositions.
    Type: Grant
    Filed: March 24, 2006
    Date of Patent: December 28, 2010
    Assignee: KratonPolymers U.S. LLC
    Inventors: Kathryn J. Wright, Carl L. Willis, Dale L. Handlin, Jr.