Electrographic recording medium with conductive layer containing metal oxide semiconductor
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsShigeru Tsubusaki, Nobuo Sonoda, Wataru Shimotsuma
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Abstract
An electrographic recording medium comprising a conductive layer coated on a support such as of paper and overcoated with a dielectric layer. The conductive layer contains fine particles of an n-type metal oxide semiconductor, preferably a whitish or lightly colored one such as SnO.sub.2, In.sub.2 O.sub.3 or ZnO, dispersed in a binder which may be either a nonconductive polymer or a polyelectrolyte. This recording medium is excellent in recording characteristics and particularly advantageous in its usefullness over a wide humidity range containing very low relative humidities.
Claims14
An electrographic recording medium comprising:
- a paper or plastic support;
- and
- a conductive layer and a dielectric layer formed on said support in this order, said conductive layer comprising a dispersion of fine particles of at least one n-type metal oxide semiconductor selected from the group consisting of SnO.sub.2, In.sub.2 O.sub.3 and ZnO and whose resistivity is in the range of below 10.sup.4 .OMEGA..multidot.cm when compressed under a pressure of 70 kg/cm.sup.2, in an organic binder comprising a polymeric electrolyte of high molecular weight, or a mixture of the polymeric electrolyte with a non-conductive polymer, the surface resistivity of said conductive layer being in the range of from 10.sup.6 .OMEGA. to 10.sup.8 .OMEGA. under conditions of a relative humidity of about 65% and room temperature.
Dependencies are inferred from the claim text.