Living olefin polymerization processes

Details Living olefin polymerization processes Living olefin polymerization processes

1997-04-11

1999-03-30

Acquah, Samuel A.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 65, 526 66, 526 72, 526 73, 526 75, 526 78, 526 90, 526108, 526126, 526217, 526903, 522 63, 522 65, 522 66, 522 68, 522113, 522184, 502150, 502167, 502232, C08F 418, C08F 246

Patent

active

058891285

ABSTRACT:
Processes for the living polymerization of olefin monomers with terminal carbon-carbon double bonds are disclosed. The processes employ initiators that include a metal atom and a ligand having two group 15 atoms and a group 16 atom or three group 15 atoms. The ligand is bonded to the metal atom through two anionic or covalent bonds and a dative bond. The initiators are particularly stable under reaction conditions in the absence of olefin monomer. The processes provide polymers having low polydispersities, especially block copolymers having low polydispersities. It is an additional advantage of these processes that, during block copolymer synthesis, a relatively small amount of homopolymer is formed.

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