Patents Assigned to Asahi Organic Chemicals Industry Col., Ltd.
  • Process for producing phenolic novolak
    Patent number: 7683155
    Abstract: A phenolic novolak having the contents of a monomeric phenol and a dimeric phenol and a degree of dispersion controlled can be obtained in high yield by a process for production of a phenolic novolak having a step of conducting a heterogeneous reaction of a phenol and an aldehyde in the presence of a phosphoric acid and an unreactive oxygen-containing organic solvent as a reaction cosolvent.
    Type: Grant
    Filed: August 29, 2003
    Date of Patent: March 23, 2010
    Assignee: Asahi Organic Chemicals Industry Col., Ltd.
    Inventors: Shigeki Inatomi, Noboru Tanoue, Motoji Yokoyama, Hirofumi Shinohara, Satoshi Takehara