Production of isotactic and regiorandom polypropylene based...

Details Production of isotactic and regiorandom polypropylene based... Production of isotactic and regiorandom polypropylene based...

2011-02-15

2011-02-15

Lee, Rip A. (Department: 1796)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C528S396000

Reexamination Certificate

active

07888444

ABSTRACT:
One step ortho-alkylation of anilines with styrenes to give chiral anilines is obtained using a strong acid catalyst, e.g. CF3SO3H. 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.

REFERENCES:
patent: 6737487 (2004-05-01), Meverden
patent: 7105604 (2006-09-01), Shimizu et al.
patent: 2005/0131160 (2005-06-01), Shimizu et al.
Cherian, A.E., et al., “A C2-Symmetric, Living α-Diimine Ni(II) Catalyst: Regioblock Copolymers from Propylene”, J. Am. Chem. Soc. 2005, 127, 13770-13771, and Supporting Information.
Cherian, A.E., et al., “Acid-Catalyzed ortho-Alkylation of Anilines with Styrenes: An Improved Route to Chiral Anilines with Bulky Substituents”, Organic Letters, 2005, vol. 7, No. 23, 5135-5137, Published on Web Oct. 13, 2005, and Supporting Information.

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