Patents by Inventor Kunihiki Ishizaki

Kunihiki Ishizaki 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).

  • Production method for water-absorbing resin powder
    Patent number: 9102804
    Abstract: A method for producing a water-absorbing resin comprises circulation of the water-absorbing resin in a predetermined amount in a pulverization step before a surface cross-linking step. At least a part of a classified polymer is supplied again to the same or a different pulverization step before the surface cross-linking step, wherein the circulation pulverization ratio in the pulverization step, represented by the following equation, is 1.10 to 1.50: (Circulation pulverization ratio)=(total supply amount of the water-absorbing resin to the pulverization step)/(total discharge amount of the water-absorbing resin at the drying step) wherein (total supply amount of the water-absorbing resin to the pulverization step)=(total discharge amount of the water-absorbing resin at the drying step)+(amount of the classified polymer supplied again to the same or a different pulverization step).
    Type: Grant
    Filed: September 16, 2010
    Date of Patent: August 11, 2015
    Assignee: Nippon Shokubai Co., Ltd
    Inventors: Sayaka Machida, Kazushi Torii, Yoko Shirai, Hiroyuki Ikeuchi, Kunihiki Ishizaki