Stable free radical polymers.
U.S. patent: 6,967,228
Issued: November 22, 2005
Inventors: Mark N. DeDecker and Daniel F. Graves
Assigned: Firestone Polymers, LLC (Logical Link Control) See "LANs" under data link protocol.
LLC - Logical Link Control
Key statement: A functional polymer having at least one substituent substituent /sub·stit·u·ent/ (-stich´u-ent)
1. a substitute; especially an atom, radical, or group substituted for another in a compound.
2. of or pertaining to such an atom, radical, or group. capable of forming a stable free radical is formed by polymerizing a diene Dienes are hydrocarbons which contain two double bonds. Dienes are intermediate between alkenes and polyenes. Classes
Dienes can be divided into three classes: - Unconjugated dienes have the double bonds separated by two or more single bonds.
monomer, such as butadiene, to form a first polymer block of the functional polymer. A vinyl aromatic monomer, such as styrene, is polymerized to form a second polymer block. The copolymer copolymer: see polymer. 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.
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