Methods of Constructing Polyolefins having Reduced Crystallinity
The invention describes a family of polyolefins characterized by chain-walking defects of the type that add extra backbone carbons per monomer.
These polyolefins display a large decrease in crystallinity relative to polyolefins known in the art. Specifically, the reduction in crystallinity is much greater than for earlier polypropylenes with a matched content of stereo or 1-alkene type defects. The claimed polyolefins can be an alkene-based homopolymer, or an alkene-based copolymer and can be made by a diimine-based catalyst or by a late metal catalyst. The defects in the polyolefin backbone are generated by a chain walking mechanism in which three or more carbons per monomer are added to the polymer backbone instead of two, as in conventional polymerization or copolymerization methods of alpha olefins.
Applications and Advantages:
- Plastic wrapping
- Thin films
- Co-extrusion layers or molded parts in the absence of polymer blending or copolymerization
- The cost of materials production can be reduced