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US 3,959,398 AGranted
Alpha-methyl-p-bromo-styrene and method of preparation
AssigneeThe Goodyear Tire & Rubber Company
InventorGeorge Jalics
Life of this patent
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Abstract
Alpha-methyl-p-bromo-styrene prepared by the manipulative steps of brominating poly(.alpha.-methyl-styrene) and subsequently depolymerizing the brominated polymer. The alpha-methyl-p-bromo-styrene has particular utility as a co-monomer for preparing copolymers exhibiting a flame retardancy.
Claims5
A method of preparing .alpha.-methyl-p-bromo-styrene which comprises the sequential steps of obtaining a chlorinated aliphatic hydrocarbon solvent solution of poly(.alpha.-methyl-styrene) having a molecular weight in the range of about 1,000 to about 200,000;
- brominating said polymer with liquid or gaseous bromine at a temperature in the range of about 20.degree. to about 100.degree.C;
- and depolymerizing said brominated polymer by heating to a temperature in the range of about 250.degree. to about 500.degree.C.
Dependencies are inferred from the claim text.