Patent Number: 6,967,228

Title: Stable free radical polymers

Abstract: A functional polymer having at least one substituent capable of forming a stable free radical is formed by polymerizing a diene monomer, such as butadiene, to form a first polymer block of the functional polymer. The first polymer block has a weight average molecular weight of less than 150,000. A vinyl aromatic monomer, such as styrene, is polymerized to form at least a second polymer block of the functional polymer. The copolymer is contacted with a stable free radical providing compound to form the functional polymer. By adding sufficient vinyl aromatic monomer, a low molecular weight functional rubber polymer can be rendered processable at ambient temperatures, while maintaining a solution viscosity which is suited to subsequent free radical catalyzation of vinyl aromatic monomers.

Inventors: DeDecker; Mark N. (North Canton, OH), Graves; Daniel F. (Canal Fulton, OH)

Assignee: Firestone Polymers, LLC

International Classification: C08F 8/00 (20060101); C08F 293/00 (20060101); C08L 55/00 (20060101); C08L 53/02 (20060101); C08L 55/02 (20060101); C08L 53/00 (20060101); C08F 293/00 (); C08F 002/38 ()

Expiration Date: 1/22/02018