Patent ID: 8133581

Claim:
An electroconductive polymer composition comprising an electroconductive polymer having an electroconductivity of 10 −6 S·cm −1 or more and a trivalent phosphorus compound, wherein the trivalent phosphorus compound is a compound represented by the following formulae (I), (II), (III) or (IV): wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 and R 12 in Formulae (I), (II), (III) and (IV) each independently represent a hydrogen atom, an alkyl group having 1 to 40 carbon atoms, an aryl group having 6 to 40 carbon atoms, or a five-membered to eight-membered heteroaryl group including at least one hetero atom of N, S, O or Se, wherein the electroconductive polymer includes polythiophene or a derivative thereof represented by the following Formula (1): wherein, in Formula (1), R 11 represents a substituent; m11 is an integer of from 0 to 2; when m11 represents 2, the R 11 s may be either the same or different and also may be linked to each other to form a ring; and n 11 is an integer of 1 or greater, and wherein a compounding ratio of the trivalent phosphorus compound and the electroconductive polymer (trivalent phosphorus compound:electroconductive polymer) is in a range of from 0.05:1.2 to 1:1.2 by mass ratio.