Abstract: A tin oxide fiber expressed by the general formulaSn.sub.(1-y) Z.sub.y O.sub.2 (I)wherein Z is a metal element of the Group V of the periodic table, and y is 0 to 0.3, having a diameter which is greater than 1 .mu.m or having a length which is greater than 3 mm and having an aspect ratio which is greater than 10.This fiber is process for producing a tin oxide fiber comprising spinning an alcohol solution of a tin compound soluble in alcohol, or spinning an alcohol solution of said tin compound and a compound of a metal of the Group V of the periodic table that is soluble in alcohol, followed by heating.

Abstract: The present invention relates to a resin molding compound for sealing electronic parts.In general, electronic parts are sealed in ceramic packages or synthetic resin molding compounds in order to protect them from an external circumstance in the use thereof.In many cases, materials consisting of synthetic resins and inorganic fillers mainly comprising silicon oxide have been used as sealing materials for synthetic resin molding compounds.However, a defect has occurred in that since an infinitesimal quantity of radioactive elements such as uranium and thorium is contained in inorganic fillers, a memory element in electronic parts produces misactions by alpha-rays radiated from radioactive elements according to circumstances and thereby the fidelity of electronic parts is greatly influenced.

Abstract: In producing silica glass, which may contain additional metal(s) such as Ti or Zr, from a solution of a silicon alkoxide, mixed with alkoxide(s) of the additional metal(s) where necessary, in water and a hydrophilic organic solvent by shaping the solution into a desired form such as a coating film on a substrate, self-supporting film, fiber or lump when the solution exhibits a suitably high viscosity and sufficiently heating the shaped solution, a water-soluble organic polymeric substance is added to the solution as a viscosity adjusting agent to soon increase the viscosity of the solution to the desirable level. Therefore, shaping of the solution can be performed without awaiting the progress of hydrolysis of the alkoxide in the solution, and the glass can be obtained with improved uniformity of its properties. A cellulose ether is preferred as the viscosity adjusting agent, and hydroxypropyl cellulose is particularly preferable.