Process for the preparation of undoped polyaniline via para-haloaniline
AssigneeMonsanto Company
InventorBrian K. Cheng
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Abstract
An improved method for the synthesis of low molecular weight polyaniline provides for heating a para-haloaniline in the presence of a high-boiling organic solvent and a vanadium catalyst. A neutral polyaniline can be synthesized by removing hydrogen halide as it is produced.
Claims29
A method for producing low molecular weight polyaniline comprising homopolymerizing a para-haloaniline at a temperature in excess of about 180.degree. C. in the presence of a vanadium catalyst and a solvent, thereby to produce polyaniline having a number average molecular weight of from about 300 to about 8,000 and a hydrogen halide.
A method for producing low molecular weight neutral polyaniline, comprising homopolymerizing para-chloroaniline at a temperature in excess of about 180.degree. C. in the presence of a catalyst and a solvent, thereby polymerizing the para-chloroaniline to produce polyaniline having a number average molecular weight of from about 300 to about 8,000 and hydrogen chloride;
- and neutralizing the hydrogen chloride by contacting it with a separable base.
Dependencies are inferred from the claim text.