Water-soluble self acid-doped polyaniline, method of preparation

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

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528210, 528214, 528215, 528373, 528401, 528422, 525178, 525179, 525420, 525421, 525422, 525426, 525534, 525540, 524800, 524801, 524837, 524838, 524841, 252500, C08F 216, C08F28300, C08G 7300

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058046496

ABSTRACT:
The present invention discloses a water-soluble self-acid-doped polyaniline, and its sodium salt, which can be cast into free-standing films from their aqueous solutions. A process for preparing a water-soluble self-acid-doped polyaniline is also disclosed, which comprises reacting a polyaniline with a strong base to convert the amino nitrogen thereof to anionic nitrogen; reacting sultone with the anionic nitrogen to form a side chain alkanesulfonic acid group; doping with protonic acid to form precipitate; dissolving (undoping) the precipitate in an alkaline aqueous solution; removing excess alkali from the alkaline aqueous solution; and contacting the resulting aqueous solution with a H.sup.+ -type ion exchange resin. Moreover, an aqueous solution of the present water-soluble self-acid-doped PAn can be easily mixed with an additional water soluble polymer or polymer emulsion, which can then be cased into a polymer blend film having improved mechanical properties and coupling strength to a substrate.

REFERENCES:
patent: 4948685 (1990-08-01), Ohsawa et al.
patent: 4957833 (1990-09-01), Daifuku et al.
patent: 4999263 (1991-03-01), Kabata et al.
patent: 5066556 (1991-11-01), Toyosawa et al.
patent: 5232631 (1993-08-01), Cao et al.

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