Solution diene elastomers by alkyl lithium catalysis

Details Solution diene elastomers by alkyl lithium catalysis Solution diene elastomers by alkyl lithium catalysis

1975-02-12

1976-03-16

Hamrock, William F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 841, 260 847, 260 942T, 260880B, 252431L, C08F23610, C08F 456

Patent

active

039445283

ABSTRACT:
This invention relates to a solution process for preparing copolymers of a conjugated diene hydrocarbon and a vinyl-substituted aromatic hydrocarbon using a potassium-modified organolithium catalyst. The Li/K molar ratio is varied depending upon whether a random or pseudorandom copolymer is desired and depending on whether an aliphatic hydrocarbon or aromatic hydrocarbon solvent or a mixture of such solvents is used. The invention includes the pseudorandom copolymers formed by the process of the invention, such copolymers being characterized, in part, by having blocks with two to four units of the vinyl-substituted aromatic hydrocarbon interspersed throughout the copolymer chain.

REFERENCES:
patent: 3324191 (1967-06-01), Wofford
patent: 3496154 (1970-02-01), Wofford
patent: 3872177 (1975-03-01), Halasa

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