Polymerization of norbornene-type cycloolefins

Details Polymerization of norbornene-type cycloolefins Polymerization of norbornene-type cycloolefins

C - Chemistry, Metallurgy

08

G

402/440

C08G 61/08 (2006.01)

Patent

CA 1281496

METHOD, COMPOSITION AND PRODUCT PRODUCED BY DELAYED GELATION IN THE POLYMERIZATION OF CYCLOOLEFINS Abstract of the Disclosure A method of preparing a thermoset, cross-linked polymer of a norbornene-type monomer - particularly dicyclopentadiene - is disclosed wherein a reactant stream containing a metathesis catalyst is combined with a second reactant stream containing an activator, and the combined streams are immediately injected into a mold wherein polymerization and cross-linking take place to form a shaped object. The method is characterized by a two part activator comprised of dialkylaluminum chloride or a tri- alkyl aluminum compound as one part and a dialkylaluminum io- dide as the second part. The two part activator delays the occurrence of cross-linking, thereby allowing a somewhat longer time for transfer of the combined streams to the mold and dis- tribution thereof throughout the mold. It also leads to more complete polymerization.

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