Nippon Zeon Company, Ltd.

Shin-ichiro Tahara

Yoshitsugu Hirokawa

Teiji Kohara

Tadao Natsuume

Yasuo Tsunogae

Yoshiharu Shimokawa

Masami Kitaoka

The present invention discloses an alkylidenenorbornene polymer comprising as the essential constituent at least one kind of the structural unit represented by the formula ##STR1## wherein R.sub.1 denotes an alkyl group of 1-4 carbon atoms and R.sub.2 denotes a hydrogen atom or an alkyl group of 1-5 carbon atoms, and a process for producing the same. According to the present invention, an alkylidenenorbornene polymer is obtained which is excellent in light resistance, transparency, heat resistance and moisture resistance and is useful as an optical polymeric material.

Alkylidenenorbornene polymer and process for producing the same

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.

Method of producing polymers

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Yokohama, Japan

Shin-ichiro Tahara