Process for the hydrohalogenation of buta-diene-containing polymers
AssigneeThe Firestone Tire & Rubber Company
InventorsHarold E. Adams, Stephen P. Boutsicaris, Adel F. Halasa
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Abstract
Disclosed is a novel process for the hydrohalogenation of polybutadiene and butadiene-containing copolymers in the presence of aqueous hydrogen halides. The process permits the hydrohalogenation of from about 1 to about 50% of the carbon-carbon double bonds of the polybutadiene chain and includes the steps of dissolving the polymer in a suitable organic solvent containing a catalytic amount of a quaternary ammonium salt, adding an aqueous hydrogen halide, mixing the reactants and thereafter extracting the hydrohalogenated product.
Claims10
A process for the hydrohalogenation of butadiene-containing polymer comprising the steps of:
- dissolving the butadiene-containing polymer in a suitable organic solvent containing a catalytic amount of a quaternary ammonium salt having the formula (R.sub.4 N)X wherein R is selected from the group consisting of alkyl groups having from 1 to about 20 carbon atoms, aryl groups having from 6 to about 12 carbon atoms and mixtures thereof, and X is selected from the group consisting of fluorine, chlorine, bromine and iodine;
- adding an aqueous hydrogen halide having the formula HX wherein X is selected from the group consisting of fluorine, chlorine, bromine and iodine;
- mixing the reactants for a period of time of at least about 48 hours at a temperature of about 50.degree. to 150.degree. C.;
- and,
- thereafter terminating the reaction and extracting the hydrohalogenated product.
A process for the hydrohalogenation of butadiene-containing polymer comprising the steps of:
- dissolving the butadiene-containing polymer in a suitable organic solvent containing a catalytic amount of a quaternary ammonium salt having the formula (R.sub.4 N)X wherein R is selected from the group consisting of alkyl groups having from 1 to about 20 carbon atoms, aryl groups having from 6 to about 12 carbon atoms and mixtures thereof, and X is selected from the group consisting of fluorine, chlorine, bromine and iodine;
- adding an aqueous hydrogen halide having the formula HX wherein X is selected from the group consisting of fluorine, chlorine;
- bromine and iodine;
- mixing the reactants for a period of time of at least about 48 hours at a temperature of about 80.degree. C.;
- and,
- thereafter terminating the reaction and extracting the hydrohalogenated product.
Dependencies are inferred from the claim text.