Patents by Inventor John T. C. Cheng

John T. C. Cheng 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).

  • Reduction of wall fouling in the suspension polymerization of vinyl chloride homopolymer
    Patent number: 4451625
    Abstract: This invention relates to a method for reducing the amount of wall fouling in the suspension polymerization of vinyl chloride. The surfaces of the polymerization reactor are wetted with a solution containing from 5 to 50 wt % alkali metal hydroxide, 0.01 to 1 wt % free radical inhibitor and 0.01 to 1 wt % surface active agent prior to charging the vinyl chloride polymerization recipe to the reactor. Preferably, the surface of the wetted reactor is heated to a temperature from 40.degree. to 100.degree. C. for at least 5 minutes prior to charging the polymerization recipe.
    Type: Grant
    Filed: August 5, 1982
    Date of Patent: May 29, 1984
    Assignee: Air Products and Chemicals, Inc.
    Inventors: John T. C. Cheng, Michael Langsam