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Science 5 May 2006:
Vol. 312. no. 5774, pp. 714 - 719
DOI: 10.1126/science.1125268
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Research Articles

Catalytic Production of Olefin Block Copolymers via Chain Shuttling Polymerization

Daniel J. Arriola,1* Edmund M. Carnahan,2* Phillip D. Hustad,2* Roger L. Kuhlman,2* Timothy T. Wenzel1*

We report a catalytic system that produces olefin block copolymers with alternating semicrystalline and amorphous segments, achieved by varying the ratio of {alpha}-olefin to ethylene in the two types of blocks. The system uses a chain shuttling agent to transfer growing chains between two distinct catalysts with different monomer selectivities in a single polymerization reactor. The block copolymers simultaneously have high melting temperatures and low glass transition temperatures, and therefore they maintain excellent elastomeric properties at high temperatures. Furthermore, the materials are effectively produced in economically favorable, continuous polymerization processes.

1 The Dow Chemical Company, Building 1702, Midland, MI 48674, USA.
2 The Dow Chemical Company, 2301 Brazosport, Freeport, TX 77541, USA.

* To whom correspondence should be addressed. E-mail: djarriola{at}dow.com (D.J.A.); ecarnahan{at}dow.com (E.M.C.); pdhustad{at}dow.com (P.D.H.); kuhlmarl{at}dow.com (R.L.K.); wenzeltt{at}dow.com (T.T.W.)

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