Method for preparation of conjugated arylene and hetroarylene vi

Details Method for preparation of conjugated arylene and hetroarylene vi Method for preparation of conjugated arylene and hetroarylene vi

1995-09-15

1997-04-15

Henderson, Christopher

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From sulfur-containing reactant

313503, 528380, 528397, 528481, C08G 6102, C08G 7500

Patent

active

056210698

ABSTRACT:
A technique is described for the preparation of conjugated arylene and heteroarylene vinylene polymers by thermal conversion of a polymer precursor prepared by reacting an aromatic ring structure with an aqueous solution of an alkyl xanthic acid potassium salt. In this processing sequence the xanthate group acts as a leaving group and permits the formation of a prepolymer which is soluble in common organic solvents. Conversion of the prepolymer is effected at a temperature ranging from 150.degree.-250.degree. C. in the presence of forming gas. Studies have shown that electroluminescent devices prepared in accordance with the described technique evidence internal quantum efficiencies superior to those of the prior art due to the presence of pinhole free films and therefore permit the fabrication of larger area LED's than those prepared by conventional techniques.

REFERENCES:
patent: 4521589 (1985-06-01), Yamamoto

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