Patents Assigned to Sumitomo Rubber Industry Company, Ltd.
  • Deproteinized natural rubber and process for producing the same
    Patent number: 6239253
    Abstract: A deproteinized natural rubber substantially free from any protein and a process for producing the same which comprises treating a latex with a protease and a specific surfactant or a combination of specific surfactants and separating rubber particles are disclosed. A method for elevating the green strength of a natural rubber and a method for lowering the green strength of a natural rubber are also disclosed. Furthermore, a means for preventing allergy induced by natural rubber is also disclosed.
    Type: Grant
    Filed: July 19, 1999
    Date of Patent: May 29, 2001
    Assignees: KAO Corporation, Sumitomo Rubber Industry Company, Ltd.
    Inventors: Yasuyuki Tanaka, Yuichi Hioki, Naoya Ichikawa
  • Process for producing deproteinized natural rubber using protease and anionic surfactant
    Patent number: 6204358
    Abstract: A deproteinized natural rubber substantially free from any protein and a process for producing the same which comprises treating a latex with a protease and a specific surfactant or a combination of specific surfactants and separating rubber particles are disclosed. A method for elevating the green strength of a natural rubber and a method for lowering the green strength of a natural rubber are also disclosed. Furthermore, a means for preventing allergy induced by natural rubberis also disclosed.
    Type: Grant
    Filed: July 19, 1999
    Date of Patent: March 20, 2001
    Assignees: Kao Corporation, Sumitomo Rubber Industry Company, Ltd.
    Inventors: Yasuyuki Tanaka, Yuichi Hioki, Naoya Ichikawa