Production of isotactic and regiorandom polypropylene based polymer and block copolymers
One step ortho-alkylation of anilines with styrenes to give chiral anilines is obtained using a strong acid catalyst, e.g. CF 3 SO 3 H. Condensation of the product to give ligand and metallation gives complex which catalyzes polymerization of propylene to give isotactic propylene or regiorandom propylene of low PDI or blocks thereof, depending on polymerization temperature.
1. Multi-block copolymer having PDI less than 3 and M n ranging from 1,000 to 1,000,000 comprising at least one block of isotactic propylene based polymer having T m greater than 50° C. and M n ranging from 1,000 to 999,000 and at least one block of regiorandom propylene based polymer having a percentage of 3,1-inserted polypropylene units ranging from 1-99 mole percent, and a M n ranging 1,000 to 999,000.
2. Multi-block copolymer as claimed in claim 1 where the regiorandom propylene based polymer consists of regiorandom polypropylene.
3. A multi-block copolymer according to claim 1 which is a triblock copolymer where a first block is isotactic propylene based polymer having T m greater than 50° C. and M n ranging from 1,000 to 998,000 and a second block is regiorandom propylene based polymer having a percentage of 3,1-inserted of propylene units ranging from 1-99 mole %, and a M n ranging from 1,000 to 998,000, and a third block is isotactic propylene based polymer having T m greater than 50° C. and a M n ranging 1,000 to 998,000.
4. A multi-block copolymer according to claim 3 where the regiorandom propylene based polymer consists of regiorandom polypropylene.