Process for producing polymer by ring-opening polymerization

Details Process for producing polymer by ring-opening polymerization Process for producing polymer by ring-opening polymerization

1990-07-18

1991-07-23

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526283, C08F 444, C08F13600

Patent

active

050344820

ABSTRACT:
A process for producing a polymer by ring-opening polymerization of a norbornene-type monomer, which comprises starting the ring-opening polymerization in the presence of a Ziegler-type catalyst consisting essentially of an organometallic compound of a metal belonging to the groups I to III of the periodic table and titanium tetrahalide, carrying out the ring-opening polymerization until the norbornene-type monomer shows a conversion ratio of not less than 60%, and then adding a tungsten and/or molybdenum-based metathesis catalyst to the polymerization reaction system to continue the ring-opening polymerization.

REFERENCES:
CA 66:116155w, 1967.
Takao Oshika and Hiroyoshi Tabuchi, Ring-opening Polymerization of Norbornene and Its Derivatives by MoCl.sub.5, WCl.sub.6, and ReCl.sub.5, Bulletin of the Chemical Society of Japan, vol. 41, 211-217 (1968).

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