Patents by Inventor Masami Kitaoka

Masami Kitaoka 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).

  • Method of producing polymers
    Patent number: 5248746
    Abstract: A method of producing a polymer of a cationically polymerizable vinyl monomer by polymerizing at least one cationically polymerizable vinyl monomer using a polymerization initiator system composed of an organic compound having a functional group represented by formula (I) below ##STR1## where R.sup.1 represents a hydrogen atom, an alkyl group, or an aryl group; R.sup.2 represents an alkyl group, or an aryl group; X represents a halogen atom, an alkoxy group, or an acyloxy group, and a Lewis acid, wherein polymerization is carried out in the presence of a phosphorus-containing compound selected from the group consisting of a phosphine, a phosphine oxide, a phosphite, and a phosphate.
    Type: Grant
    Filed: April 2, 1991
    Date of Patent: September 28, 1993
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Yoshiharu Shimokawa, Yasuo Tsunogae, Shin-ichiro Tahara, Masami Kitaoka, Yoshitsugu Hirokawa