Patents by Inventor Mutsuhiro Aoki

Mutsuhiro Aoki 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).

  • Process for producing hydrocarbon resins having improved color and thermal stability
    Patent number: 4230840
    Abstract: A process for producing a hydrocarbon resin having improved color and thermal stability, which comprises treating a petroleum cracking or reforming fraction containing cationically polymerizable hydrocarbons and not more than 0.7% by weight, based on the fraction, of cyclopentadienes and having a boiling range of from 140.degree. C. to 280.degree. C., with 0.8 to 3.0 moles, per mole of the cyclopentadienes, of a dienophile compound having a carbon-to-carbon double bond and a carbonyl or cyano group adjacent to the double bond; and then polymerizing the treated petroleum fraction in the presence of a polymerization catalyst.
    Type: Grant
    Filed: December 26, 1978
    Date of Patent: October 28, 1980
    Assignee: Mitsui Petrochemical Industries Ltd.
    Inventors: Shigeru Katayama, Mutsuhiro Aoki