Novel Ethylene Copolymers Based on Single-Site Catalysts

7 Novel Ethylene Copolymers Based on Single-Site Catalysts 

Although ethylene/1-olefin copolymers were well documented in the late 1950s with the discovery of the chromium-based Phillips catalyst and the titanimn-based Ziegler catalyst, it was the discovery of metallocene-based single-site catalysts and the constrained geometry catalyst system that significantly increased the various types of new ethylene-based copolymers that are available for commercial applications. These new catalysts created new products, applications and markets for the polyethylene industry. 

Some approximate reactivity ratio data with single-site catalysts compared to a commercial Ziegler-type catalyst is shown in Table 4.9. This data shows that single-site catalysts react approximately 2-50 times better with 1-hexene than the Ziegler-type catalyst which requires relatively 

The Dow catalyst introduced new commercial products with densities between about 0.85 g/cc to about 0.91 g/cc. 

Ethylene/1-octene copolymers containing approximately 10-50 wt% 1 -octene with corresponding polyethylene densities of 0.91-0.85 g/cc and Melt Index (I values of 0.2-30 dg/min, are new compositions that are 

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