Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making
Patent
1992-05-12
1994-12-27
Kight, III, John
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
525389, 525537, 525535, 430311, 430494, C08G 7514
Patent
active
053765028
ABSTRACT:
Photoactive cationic organic polymers are provided which are electrically insulating and which are capable of photolysis to an electrically conductive form. The organic polymer includes a C-A linkage, wherein C is a chalcogenide-sulfide, selenide or telluride-in the polymer backbone chain and A is in aryl or alkyl group. The C-A linkage is capable of being cleaved in the presence of ultraviolet light to release A as a free radical and cause the polymer to become electrically conducting in the presence of the light while the remainder of the polymer remains electrically non-conducting. A thin film of such a polymer containing an electrically insulating region and a photolysed electrically conductive region may be used as a semiconductor. Methods for forming photoactive arylated or alkylated poly(phenylene chalcogenide) polymers involving the step of direct arylation or alkylation of a poly(phenylene chalcogenide) polymer are also provided. In addition, a method is provided for forming a semiconductor. The method involves the steps of selectively exposing at least one region of a photoactive electrically insulating cationic organic polymer to photolytic light to release a radical and convert the exposed region to a stable electrically conducting state.
REFERENCES:
Novak, Bruce M., et al.; "Photodoped Conducting Polymers;" Polymer Preprints vol. 31, No. 2, Aug. 8, 1990; pp. 482-483.
Shacklette, R. L. et al. "Conducting complexes of polyphenylene sulfides", Chem. Phys. 75:1919-1927 Aug./1981.
Crivello, J. V. et al. Mar./(1980) J. Polym. Sci. Polym. Chem. Ed., 18:2677-2695, "Complex Triarylsulfonium Salt Photoinitiators. I. The Identification, Characterization, and Synthesis of a New Class of Triarylsulfonium Salt Photoinitiators".
Frommer, J. E. et al. (1983) J. Polym. Sci. Polym. Chem. Ed., 21:39-44, "Arsenic Trifluoride-Arsenic Pentafluoride Synergism in the Formation of Electrically Conductive Poly(p-Phenylene Sulfide)".
Haagen Edward H.
Novak Bruce M.
Viswanathan Anand
Johnson Rachel
Kight III John
Regents of the University of California
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