Cycloolefin copolymer and preparation method thereof

Abstract

The invention relates to the field of olefin polymerization, in particular to a cycloolefin copolymer and a preparation method thereof, and the cycloolefin copolymer is composed of structural units. A post-transition metal catalyst with a specific structure and a chain walking characteristic is adopted, generation of crystalline ethylene chain segments is avoided, the transparency of the obtained copolymer is improved, a branched structure is introduced into a polymer chain, under the same norbornene content, the polymer has a higher glass transition temperature than a metallocene ethylene / norbornene copolymer, and the thermal stability of the polymer is improved. Meanwhile, the catalytic system has good tolerance to water, oxygen and polar groups, can be used for preparing cycloolefin copolymers with polar groups, and has a wider application prospect.

Description

technical field

[0001] The invention relates to the field of olefin polymerization, more specifically, the invention relates to a cycloolefin copolymer and a preparation method thereof. Background technique

[0002] Cycloolefin copolymer is a kind of amorphous thermoplastic polymer prepared by addition copolymerization of cycloolefin monomer. It not only has the characteristics of good transparency, good heat resistance, low water absorption, chemical corrosion resistance, etc., but also has mechanical With the advantages of high strength, good dimensional stability, and low dielectric constant, it is widely used in optical materials, communication equipment, medical materials, packaging materials and other fields.

[0003] According to known literature, cycloolefin copolymers can be prepared by metallocene catalysts (CN95107662, CN94120496) or other non-transition metallocene catalysts (CN201610040109), but due to the inevitable homopolymerization of ethylene during the pol...

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