Copolymerization process for the preparation of crystalline copo

Details Copolymerization process for the preparation of crystalline copo Copolymerization process for the preparation of crystalline copo

1995-06-07

1997-04-15

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526133, 526434, 526160, 526170, 526281, 526283, 526308, C08F 4643, C08F23204, C08F23208

Patent

active

056210540

ABSTRACT:
A copolymerization process suitable for the preparation of high crystalline melting point cyclic olefin copolymers comprising contacting ethylene, and at least one cyclic olefin with an active polymerization catalyst comprising a Group 4 transition metal compound containing an asymmetrically substituted monocyclopentadienyl ancillary ligand, a bulky substituent-containing heteroatom ligand, the monocyclopentadienyl and heteroatom ligands being covalently bridged is disclosed. Ethylene
orbornene copolymers prepared in accordance with the invention exhibited crystalline melting points of about 250.degree. C., and were prepared at high catalyst activity levels with feed ratios less than 6:1 of norbornene to ethylene.

REFERENCES:
patent: 5204429 (1993-04-01), Kaminsky et al.
patent: 5227440 (1993-07-01), Canich et al.
patent: 5264405 (1993-11-01), Canich
patent: 5324801 (1994-06-01), Brekner et al.
patent: 5498677 (1996-03-01), Weller et al.
Walter Kaminsky, "New Materials by Polymerization of Cyclic Olefins with Metallocene Catalysts", Paper for METCON '93, Houston, Texas, May 26-28, 1993, pp. 325-335.
Cherdon et al, "Cycloolefin Copolymers: A New Class of Transparent Thermoplastics", Die Angerwandte Makromolekulare Chemie, 223, pp. 121-133 (1994) Translation by Robert Saxon Jan. 16, 1995.
"Ethylene-cyclic Mono Olefin Copolymer" p. 738 Research Disclosure Nov. 1993.

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