Method for producing conductive polyaniline and organic polymer composition
View Patent ↗A method for producing a conductive polyaniline comprising oxidative polymerizing aniline or its derivative in the presence of at least one member of a sulfonic acid compound and a water-insoluble organic polymer compound having protonic acid group in a mixed layer composed of an aqueous layer and organic layer, during which it establishes the presence of a molecular weight adjusting agent and, optionally, a phase transfer catalyst so as to stably disperse them in an organic solvent, and an organic polymer composition containing the conductive polyaniline.
1. A method for producing a conductive polyaniline dispersion comprising a stably dispersed conductive polyaniline in an organic solvent, said method comprising the step of oxidative polymerizing aniline or its derivative in the presence of at least one member selected from the group consisting of (i) sulfonic acids and (ii) water-insoluble organic polymers having a protonic acid group in an aqueous layer and a water-insoluble organic solvent layer, wherein said polymerization takes place in the presence of an oxidizing agent, a molecular weight adjusting agent and a phase transfer catalyst.
2. A method for producing a conductive polyaniline dispersion as claimed in claim 1 , wherein the sulfonic acid is a sulfonic acid having an at least C 7 hydrocarbon group.
3. A method for producing a conductive polyaniline dispersion as claimed in claim 1 , wherein the protonic acid group is a sulfonic acid group, carboxyl group, phosphoric acid group or sulfuric acid group.
4. A method for producing a conductive polyaniline dispersion as claimed in claim 1 , wherein the molecular weight adjusting agent is an aniline derivative having a substituent at its 4th position, a thiol compound, a disulfide compound or an α-methylmethylene dimer.
5. A method for producing a conductive polyaniline dispersion as claimed in claim 4 , wherein the thiol compound is a thiol compound having an at least C 4 hydrocarbon group.
6. A method for producing a conductive polyaniline dispersion as claimed in claim 4 , wherein the disulfide compound is a disulfide compound having an at least C 2 hydrocarbon group.
7. A method for producing a conductive polyaniline dispersion as claimed in claim 1 , wherein the phase transfer catalyst is a quaternary ammonium salt, phosphonium salt or crown ether compound.
8. A method for producing a conductive polyaniline dispersion as claimed in claim 1 , wherein the oxidation polymerization is carried out using a persulfate as the oxidizing agent.
9. A method for producing a conductive polyaniline dispersion as claimed in claim 1 , wherein the amount of the sulfonic acid used is 0.01 to 10 moles per mole of the aniline or its derivative.
10. A method for producing a conductive polyaniline dispersion as claimed in claim 1 , wherein the amount of the polymer compound having the protonic acid group is an amount by which the protonic acid group becomes 0.05 to 20 moles based upon 1 mole of the aniline or its derivative.